US20080172057A1 - Spine distraction implant and method - Google Patents
Spine distraction implant and method Download PDFInfo
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- US20080172057A1 US20080172057A1 US11/692,306 US69230607A US2008172057A1 US 20080172057 A1 US20080172057 A1 US 20080172057A1 US 69230607 A US69230607 A US 69230607A US 2008172057 A1 US2008172057 A1 US 2008172057A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
- A61K31/365—Lactones
- A61K31/366—Lactones having six-membered rings, e.g. delta-lactones
- A61K31/37—Coumarins, e.g. psoralen
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7065—Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7068—Devices comprising separate rigid parts, assembled in situ, to bear on each side of spinous processes; Tools therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
- A61B17/66—Alignment, compression or distraction mechanisms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7071—Implants for expanding or repairing the vertebral arch or wedged between laminae or pedicles; Tools therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/025—Joint distractors
- A61B2017/0256—Joint distractors for the spine
Abstract
Description
- This application is a continuation of U.S. patent application Ser. No. 10/732,589, entitled “Spine Distraction Implant,” filed Dec. 10, 2003, which is a divisional application of U.S. patent application Ser. No. 09/842,756, entitled “Spine Distraction Implant,” filed Apr. 26, 2001, now U.S. Pat. No. 6,699,247, which is a continuation of U.S. patent application Ser. No. 09/474,038, entitled “Spine Distraction Implant,” filed Dec. 28, 1999, now U.S. Pat. No. 6,332,882, which is a continuation of U.S. patent application Ser. No. 09/175,645, entitled “Spine Distraction Implant,” filed Oct. 20, 1998, now U.S. Pat. No. 6,068,630, which is a continuation-in-part of U.S. patent application Ser. No. 08/958,281, entitled “Spine Distraction Implant and Method,” filed Oct. 27, 1997, now U.S. Pat. No. 5,860,977, which is a continuation-in-part of U.S. patent application Ser. No. 08/778,093, entitled “Spine Distraction Implant and Method,” filed Jan. 2, 1997, now U.S. Pat. No. 5,836,948, each of which is incorporated herein by reference in its entirety.
- As the present society ages, it is anticipated that there will be an increase in adverse spinal conditions which are characteristic of older people. By way of example, with aging comes increases in spinal stenosis (including but not limited to central canal and lateral stenosis), the thickening of the bones which make up the spinal column and facet arthropathy. Spinal stenosis is characterized by a reduction in the available space for the passage of blood vessels and nerves. Pain associated with such stenosis can be relieved by medication and/or surgery. Of course, it is desirable to eliminate the need for major surgery for all individuals and in particular for the elderly.
- Accordingly, there needs to be developed procedures and implants for alleviating such condition which are minimally invasive, can be tolerated by the elderly and can be performed preferably on an outpatient basis.
- The present invention is directed to providing a minimally invasive implant and method for alleviating discomfort associated with the spinal column.
- The present invention provides for apparatus and method for relieving pain by relieving the pressure and restrictions on the aforementioned blood vessels and nerves. Such alleviation of pressure is accomplished in the present invention through the use of an implant and method which distract the spinous process of adjacent vertebra in order to alleviate the problems caused by spinal stenosis and facet arthropathy and the like. While the implant and method particularly address the needs of the elderly, the invention can be used with individuals of all ages and sizes where distraction of the spinous process would be beneficial.
- In one aspect of the invention, an implant is provided for relieving pain comprising a device positioned between a first spinous process and a second spinous process. The device includes a spinal column extension stop and a spinal column flexion non-inhibitor.
- In another aspect of the invention, the implant is positioned between the first spinous process and the second spinous process and includes a distraction wedge that can distract the first and second spinous processes as the implant is positioned between the spinous processes.
- In yet another aspect of the present invention, the implant includes a device which is adapted to increasing the volume of the spinal canal and/or the neural foramen as the device is positioned between adjacent spinous processes.
- In yet a further aspect of the present invention, a method is presented for relieving pain due to the development of, by way of example only, spinal stenosis and facet arthropathy. The method is comprised of the steps of accessing adjacent first and second spinal processes of the spinal column and distracting the processes a sufficient amount in order to increase the volume of the spinal canal in order to relieve pain. The method further includes implanting a device in order to maintain the amount of distraction required to relieve such pain.
- In yet a further aspect of the invention, the method includes implanting a device in order to achieve the desired distraction and to maintain that distraction.
- In yet a further aspect of the invention, the implant includes a first portion and a second portion. The portions are urged together in order to achieve the desired distraction.
- In still a further aspect of the invention, the implant includes a distracting unit and a retaining unit. The distracting unit includes a body which can be urged between adjacent spinous processes. The body includes a slot. After the distracting unit is positioned, the retaining unit can fit into the slot of the retaining unit and be secured thereto.
- In yet a further aspect of the invention, the implant includes a first unit with a central body. A sleeve is provided over the central body and is at least partially spaced from the central body in order to allow for deflection toward the central body.
- In a further aspect of the invention, the implant includes a first unit having a central body with a guide and a first wing, with the first wing located at first end of the body. The guide extends from a second end of the body located distally from the first wing. The implant further includes a sleeve provided over said central body. The sleeve is at least partially spaced from the central body in order to allow for deflection of the sleeve toward the central body. The implant further includes a second wing and a device for securing the second wing to the first unit, wherein the sleeve is located between the first and second wings.
- In yet another aspect of the invention, an implant system includes a cylindrical sleeve which is inwardly deflectable. The system further includes an insertion tool which includes an insertion guide, a central body, a stop and a handle. The guide and the stop extend from opposite sides of the central body and the handle extend from the stop. A sleeve fits over the guide and against the stop preparatory to being positioned between the two adjacent vertebrae with the insertion tool.
- In yet a further aspect of the invention, the implant includes central body and first and second wings and a means for selectively positioning one of the first and second wings relative to the other in order to accommodate spinous processes of different sizes.
- Other implants and methods within the spirit and scope of the invention can be used to increase the volume of the spinal canal thereby alleviating restrictions on vessels and nerves associated therewith, and pain.
-
FIGS. 1 and 2 depict an embodiment of an implant of the invention which is adjustable in order to select the amount of distraction required.FIG. 1 depicts the implant in a more extended configuration than doesFIG. 2 . -
FIGS. 3 a and 3 b depict side and end views of a first forked and of the embodiment ofFIG. 1 . -
FIGS. 4 a and 4 b depict side sectioned and end views of an interbody piece of the implant ofFIG. 1 . -
FIGS. 5 a and 5 b depict side and end views of a second forked end of the embodiment ofFIG. 1 . -
FIGS. 6 , 7, 8, 9 and 10 depict apparatus and method for another embodiment of the present invention for creating distraction between adjacent spinous processes. -
FIGS. 11 , 12 and 13 depict yet a further embodiment of the invention for creating distraction between adjacent spinous processes. -
FIGS. 14 and 15 depict a further apparatus and method of an embodiment of the invention for creating distraction. -
FIGS. 16 , 16 a, and 17 depict yet another embodiment of the present invention. -
FIGS. 18 , 19 and 20 depict yet a further apparatus and method of the present embodiment. -
FIGS. 21 and 22 depict still a further embodiment of the present invention. -
FIGS. 23 , 24 and 25 depict another embodiment of the present invention. -
FIGS. 26 , 27 and 28 depict another embodiment of the invention. -
FIGS. 29 and 30 depict side elevational views of differently shaped implants of embodiments of the present invention. -
FIGS. 31 , 32 and 33 depict various implant positions of an apparatus of the present invention. -
FIGS. 34 and 35 depict yet another apparatus and method of the present invention. -
FIGS. 36 , 37 and 38 depict three different embodiments of the present invention. -
FIGS. 39 and 40 depict yet another apparatus and method of an embodiment of the present invention. -
FIGS. 41 , 42 and 43 depict yet further embodiments of an apparatus and method of the present invention. -
FIG. 44 is still a further embodiment of an implant of the invention. -
FIG. 45 is yet another depiction of an apparatus and method of the invention. -
FIGS. 46 and 47 depict still a further apparatus and method of an embodiment of the invention. -
FIGS. 48 , 49, 50 and 51 depict yet a further apparatus and method of the invention. -
FIGS. 52 , 53, 54, 55 a and 55 b depict another apparatus and method of the invention. -
FIGS. 56 , 57 and 58 depict yet a further apparatus and method of the invention. -
FIGS. 59 and 60 depict still a further embodiment of the invention. -
FIG. 61 depict another embodiment of the invention. -
FIGS. 62 and 63 depict yet another embodiment of the present invention. -
FIGS. 64 and 65 depict still a further embodiment of the present invention. -
FIG. 66 depicts another embodiment of the invention. -
FIGS. 67 and 68 depict yet another embodiment of the present invention. -
FIGS. 69 , 70, 71 and 71 a depict a further embodiment of the present invention. -
FIGS. 72 and 73 depict still another embodiment of the invention. -
FIGS. 74 , 75, 76, 77, and 78 depict still other embodiments of the invention. -
FIGS. 79 , 80, 80 a, 81, 82, 83, 83 a, 84, 85, 86 and 87 depict still a further embodiment of the present invention. -
FIGS. 88 , 89, 90 and 91 depict yet another embodiment of the present invention. -
FIGS. 92 , 92 a, 92 b, 93, 93 a, 93 b, 93 c, 93 d, 94, 94 a, 94 b, 95, 95 a, and 96, depict still a further embodiment of the present invention wherein a sleeve is provided which is capable of deflecting response to relative motion between the spinous processes. -
FIG. 97 depicts still another embodiment of the present invention. -
FIG. 98 depicts yet a further embodiment of the present invention. -
FIGS. 99 and 100 depict still another embodiment of the present invention including an insertion tool. -
FIGS. 101 , 102, 102 a, 103, 104, 105, 106, and 107 depict still a further embodiment of the present invention. -
FIGS. 108 , 109, and 110 depict still another embodiment of the present invention. -
FIGS. 111 , 112, 113, 114, 115, 116, and 117 depict yet another embodiment of the present invention. -
FIG. 118 depicts a graph showing characteristics of a preferred material usable with several of the embodiments of the present invention. - For simplicity in description, identical components are labeled by the same numerals in this application.
- A first embodiment of the invention is shown in
FIGS. 1-5 a, 5 b.Implant 20 includes first and second forked ends 22 and 24, each defining asaddle interbody piece 30. As can be seen inFIGS. 3 a, 3 b, the first forkedend 22 includes a threadedshaft 32 which projects rearwardly from thesaddle 26. The threadedshaft 32 fits into the threaded bore 34 (FIG. 4 a) of theinterbody piece 30. - The second forked end 24 (
FIGS. 5 a, 5 b) includes a smoothcylindrical shaft 36 which can fit into thesmooth bore 38 of theinterbody piece 30. -
FIG. 1 shows theimplant 20 in a fully extended position, whileFIG. 2 shows the implant in an unextended position. In the unextended position, it can be seen that the threadedshaft 32 of the first forkedend 22 fits inside the hollowcylindrical shaft 36 of the second forkedend 24. - For purposes of implantation between adjacent first and second spinous processes of the spinal column, the
implant 20 is configured as shown inFIG. 2 . The first and second spinous processes are exposed using appropriate surgical techniques and thereafter, theimplant 20 is positioned so thatsaddle 26 engages the first spinous process, and saddle 28 engages the second spinous process. At this point, theinterbody piece 30 can be rotated by placing an appropriate tool or pin into the cross holes 40 and upon rotation, thesaddle 26 is moved relative to thesaddle 28. Such rotation spreads apart or distracts the spinous processes with the resultant and beneficial effect of enlarging the volume of the spinal canal in order to alleviate any restrictions on blood vessels and nerves. - It is noted that this implant as well as the several other implants described herein act as an extension stop. That means that as the back is bent backwardly and thereby placed in extension the spacing between adjacent spinous processes cannot be reduced to a distance less than the distance between the lowest point of
saddle 26 and the lowest point ofsaddle 28. This implant, however, does not inhibit or in any way limit the flexion of the spinal column, wherein the spinal column is bent forward. - Preferably, such a device provides for distraction in the range of about 5 mm to about 15 mm. However, devices which can distract up to and above 22 mm may be used depending on the characteristics of the individual patient.
- With all the ligaments (such as the supraspinous ligament) and tissues associated with the spinous processes left intact, the
implant 20 can be implanted essentially floating in position in order to gain the benefits of the aforementioned extension stop and flexion non-inhibitor. If desired, one of thesaddles 26 can be laterally pinned withpin 29 to one of the spinous processes and the other saddle can be loosely associated with the other spinous processes by using atether 31 which either pierces or surrounds the other spinous process and then is attached to the saddle in order to position the saddle relative to the spinous process. Alternatively, both saddles can be loosely tethered to the adjacent spinous process in order to allow the saddles to move relative to the spinous processes. - The shape of the saddles, being concave, gives the advantage of distributing the forces between the saddle and the respective spinous process. This ensures that the bone is not resorbed due to the placement of the
implant 20 and that the structural integrity of the bone is maintained. - The
implant 20 in this embodiment can be made of a number of materials, including but not limited to, stainless steel, titanium, ceramics, plastics, elastics, composite materials or any combination of the above. In addition, the modulus of elasticity of the implant can be matched to that of bone, so that theimplant 20 is not too rigid. The flexibility of the implant can further be enhanced by providing additional apertures or perforations throughout the implant in addition to theholes 40 which also have the above stated purpose of allowing theinterbody piece 30 to be rotated in order to expand the distance between thesaddle - In the present embodiment, it is understood that the spinous processes can be accessed and distracted initially using appropriate instrumentation, and that the
implant 20 can be inserted and adjusted in order to maintain and achieve the desired distraction. Alternatively, the spinous process can be accessed and theimplant 20 appropriately positioned. Once positioned, the length of the implant can be adjusted in order to distract the spinous processes or extend the distraction of already distracted spinous processes. Thus, the implant can be used to create a distraction or to maintain a distraction which has already been created. - The placement of implants such as
implant 20 relative to the spinous process will be discussed herein with other embodiments. However, it is to be noted that ideally, theimplant 20 would be placed close to the instantaneous axis of rotation of the spinal column so that the forces placed on theimplant 20 and the forces that theimplant 20 places on the spinal column are minimized. - Further, it is noted that during the actual process of installing or implanting the
implant 20, that the method uses the approach of extending the length of the implant 20 a first amount and then allowing the spine to creep or adjust to this distraction. Thereafter,implant 20 would be lengthened another amount, followed by a period where the spine is allowed to creep or adjust to this new level of distraction. This process could be repeated until the desired amount of distraction has been accomplished. This same method can be used with insertion tools prior to the installation of an implant. The tools can be used to obtain the desired distraction using a series of spinal distraction and spine creep periods before an implant is installed. - The embodiment of the invention shown in the above
FIGS. 6 , 7, 8, 9 and 10 includes distraction orspreader tool 50 which has first andsecond arms Arms pivot point 56 and releaseable frompivot point 56 in order to effect the implantation ofimplant 58. As can be seen inFIG. 6 , in cross-section, thearms spinous process 60 relative toarm 52 and the secondspinous process 62 relative toarm 54. Thedistraction tool 50 can be inserted through a small incision in the back of the patient in order to address the space between the firstspinous process 60 and the secondspinous process 62. Once thetool 50 is appropriately positioned, thearms implant 58 as shown inFIGS. 8 and 9 , or of a design shown in other of the embodiments of this invention, can be urged between thearms arms implant 58 in place. Theimplant 58 is urged into place using atool 64 which can be secured to theimplant 58 through a threadedbore 66 in the back of the implant. As can be seen inFIG. 10 , theimplant 58 includessaddles 68 and 70 which cradle the upper and lowerspinous processes tool 50. The saddles as described above tend to distribute the load between the implant and the spinous processes and also assure that the spinous process is stably seated at the lowest point of the respective saddles. - Another embodiment of the apparatus and method of the invention is shown in
FIGS. 11 , 12 and 13. In this embodiment, the spreader ordistraction tool 80 includes first andsecond arms pivot point 86. The arms include L-shaped ends 88, 90. Through a small incision, the L-shaped ends 88, 90 can be inserted between the first and second spinous processes 92, 94. Once positioned, thearms implant 96 can then be urged between the spinous processes in order to maintain the distraction. It is noted thatimplant 96 includes wedged surfaces orramps implant 96 is being urged between the spinous processes, the ramps further cause the spinous processes to be distracted. Once theimplant 96 is fully implanted, the full distraction is maintained by theplanar surfaces implant 96 can be similar to that shown forimplant 58 or similar to other implants in order to gain the advantages of load distribution and stability. - In
FIGS. 14 and 15 , yet another embodiment of the invention is depicted. In this embodiment, theimplant 110 includes first and second conically shapedmembers Member 112 includes amale snap connector 116 andmember 114 includes afemale snap connector 118. Withmale snap connector 116 urged intofemale snap connector 118, thefirst member 112 is locked to thesecond member 114. In this embodiment, a distraction orspreader tool 80 could be used. Once the spinous process has been spread apart, animplantation tool 120 can be used to position and snap together theimplant 110. Thefirst member 112 ofimplant 110 is mounted on one arm andsecond member 114 is mounted on the other arm oftool 120. Themember members implant 110 is locked in place between the spinous processes as shown inFIG. 15 . It is to be noted that theimplant 110 can also be made more self-distracting by causing thecylindrical surface 122 to be more conical, much assurface 124 is conical, in order to holdimplant 110 in place relative to the spinous processes and also to create additional distraction. - An alternative embodiment of the implant can be seen in
FIGS. 16 and 17 . Thisimplant 130 includes first andsecond members bore 136 and engages a threadedbore 138 of thesecond member 134.Surfaces 139 are flattened (FIG. 17 ) in order to carry and spread the load applied thereto by the spinous processes. - The embodiment of
implant 130 is not circular in overall outside appearance, as is theembodiment 110 ofFIGS. 14 and 15 . In particular, with respect to the embodiment ofimplant 130 ofFIGS. 16 and 17 , this embodiment is truncated so that thelateral side lower sides 144, 146 being elongated in order to capture and create a saddle for the upper and lower spinous processes. The upper and lower sides, 144, 146 are rounded to provide a more anatomical implant which is compatible with the spinous processes. - If it is desired, and in order to assure that the
first member 132 and thesecond member 134 are aligned, key 148 andkeyway 150 are designed to mate in a particular manner.Key 148 includes at least one flattened surface, such as flattenedsurface 152, which mates to an appropriately flattenedsurface 154 of thekeyway 150. In this manner, the first member is appropriately mated to the second member in order to form appropriate upper and lower saddles holding theimplant 130 relative to the upper and lower spinous processes. -
FIG. 16 a depictssecond member 134 in combination with a rounded nose lead-inplug 135. Lead-inplug 135 includes abore 137 which can fit snugly overkey 148. In this configuration, the lead-inplug 135 can be used to assist in the placement of thesecond member 134 between spinous processes. Once thesecond member 134 is appropriately positioned, the lead-inplug 135 can be removed. It is to be understood that the lead-inplug 135 can have other shapes such as pyramids and cones to assist in urging apart the spinous processes and soft tissues in order to position thesecond member 134. - The
implant 330 as shown inFIG. 18 is comprised of first andsecond mating wedges wedges implant 330 located between the upper and lowerspinous processes 336, 338 (FIG. 20 ), increases, thereby distracting the spinous processes. It is noted that thewedges saddle spinous processes - The first or
second wedges channel 344 and a projection of 346 which can be urged into the channel in order to lock thewedges channel 334 is undercut in order to keep the projection from separating therefrom. Further, as in other devices described herein, a detent can be located in one of the channel and the projection, with a complimentary recess in the other of the channel and the projection. Once these two snap together, the wedges are prevented from sliding relative to the other in thechannel 344. - While the above embodiment was described with respect to wedges, the wedges could also have been designed substantially as cones with all the same features and advantages.
- The
implant 370 is comprised of first andsecond distraction cone spinous processes FIG. 21 . Using appropriate tool as shown hereinabove, thedistraction cones FIG. 22 . Once this has occurred, an appropriate screw or other type offastening mechanism 380 can be used to maintain the position of thedistraction cones implant 370 is self-distracting and also that the implant, being flexible, molds about the spinous processes as shown inFIG. 22 . - In
FIGS. 23 and 24 , another embodiment of theimplant 170 is depicted. This implant is guided in place using an L-shapedguide 172 which can have a concave cross-section such as thecross-section 52 ofretraction tool 50 inFIG. 6 in order to cradle and guide theimplant 170 in position. Preferably a small incision would be made into the back of the patient and the L-shapedguide tool 172 inserted between the adjacent spinous processes. Theimplant 170 would be mounted on the end ofinsertion tool 174 and urged into position between the spinous processes. The act of urging the implant into position could cause the spinous processes to be further distracted if that is required. Prior to the insertion of the L-shapedguide tool 172, a distraction tool such as shown inFIG. 13 could be used to initially distract the spinous processes. -
Implant 170 can be made of a deformable material so that it can be urged into place and so that it can somewhat conform to the shape of the upper and lower spinous processes. This deformable material would be preferably an elastic material. The advantage of such a material would be that the load forces between the implant and the spinous processes would be distributed over a much broader surface area. Further, the implant would mold itself to an irregular spinous process shape in order to locate the implant relative to spinous processes. - With respect to
FIG. 25 , thisimplant 176 can be inserted over a guide wire, guide tool orstylet 178. Initially, theguide wire 178 is positioned through a small incision to the back of the patient to a position between the adjacent spinous processes. After this has occurred, the implant is threaded over theguide wire 178 and urged into position between the spinous processes. This urging can further distract the spinous processes if further distraction is required. Once the implant is in place, theguide tool 178 is removed and the incision closed. The insertion tools ofFIGS. 23 and 24 can also be used if desired. - The embodiment shown in
FIGS. 26 , 27 and 28 uses an implant similar to that depicted inFIGS. 8 and 9 with different insertion tools. As can be seen inFIG. 26 , an L-shapeddistraction tool 190 is similar to L-shaped distraction tool 80 (FIG. 12 ), is used to distract the first and secondspinous processes insertion tool 196 is placed between thespinous processes Insertion tool 196 includes ahandle 198 to which is mounted a square-shapedring 200. - The
distraction tool 190 can be inserted through a small incision in the back in order to spread apart the spinous processes. Through the same incision which has been slightly enlarged laterally, anupper end 202 ofring 200 can be initially inserted followed by the remainder of thering 200. Once the ring is inserted, the ring can be rotated slightly by movinghandle 198 downwardly in order to further wedge the spinous processes apart. Once this has been accomplished, an implant such asimplant 204 can be inserted through the ring and properly positioned usingimplant handle 206. Thereafter, theimplant handle 206 and theinsertion tool 196 can be removed. - As can be seen in
FIGS. 29 and 30 , theimplants FIG. 8) and 204 (FIG. 28 ). These implants have cross-sections similar to that shown inFIG. 10 which includes saddles in order to receive and hold the adjacent spinous processes. - As can be seen in
FIGS. 31 , 32 and 33, these implants can be placed in different positions with respect to thespinous process 214. Preferably as shown inFIG. 33 , theimplant 210 is placed closest to thelamina 216. Being so positioned, theimplant 210 is close to the instantaneous axis ofrotation 218 of the spinal column, and the implant would experience least forces caused by movement of the spine. Thus, theoretically, this is the optimal location for the implant. - As can be seen in
FIGS. 31 and 32 , the implant can be placed midway along the spinous process (FIG. 32 ) and towards the posterior aspect of the spinous process (FIG. 31 ). As positioned shown inFIG. 31 , the greatest force would be placed on theimplant 210 due to a combination of compression and extension of the spinal column. - Another embodiment of the invention is shown in
FIGS. 34 and 35 . In these figures,implant 220 is comprised of a plurality ofindividual leaves 222 which are substantially V-shaped. The leaves include interlocking indentations ordetents 224. That is, each leaf includes an indentation with a corresponding protrusion such that a protrusion of one leaf mates with an indentation of an adjacent leaf. Also associated with this embodiment is aninsertion tool 226 which has ablunt end 228 which conforms to the shape of anindividual leaf 222. For insertion of this implant into the space between the spinous processes as shown inFIG. 29 , theinsertion tool 226 first insert asingle leaf 220. After that has occurred, the insertion tool then inserts a second leaf with theprotrusion 224 of the second leaf snapping into corresponding indentation made by theprotrusion 224 of the first leaf. This process would reoccur with third and subsequent leaves until the appropriate spacing between the spinous processes was built up. As can be seen in FIG. 29, thelateral edges 229 of the individual leaves 222 are slightly curved upwardly in order to form a saddle for receiving the upper and lower spinous processes. - The embodiments of
FIGS. 36 , 37 and 38 which includeimplants Implant 220 is essentially a series of truncated cones and includes a plurality of ever expandingsteps 236. These steps are formed by the conical bodies starting with thenose body 238 followed there behind byconical body 240. Essentially, theimplant 234 looks like a fir tree placed on its side. - The
implant 230 is inserted laterally throughout the opening between upper and lower spinous processes. Thefirst body 238 causes the initial distraction. Each successive conical body distracts the spinous processes a further incremental amount. When the desired distraction has been reached, the spinous processes are locked into position bysteps 236. At this point, if desired, theinitial nose body 238 of the implant andother bodies 240 can be broken, snapped or sawed off if desired in order to minimize the size of theimplant 230. In order for a portion of theimplant 230 to be broken or snapped off, the intersection between bodies such asbody intersection line 242, would be somewhat weaken with the appropriate removal of material. It is noted that only the intersection lines of the initial conical bodies need to be so weakened. Thus,intersection line 244 between the bodies which remain between the spinous processes would not need to be weaker, as there would be no intention that the implant would be broken off at this point. -
FIG. 37 shows implant 232 positioned between upper and lower spinous processes. This implant is wedge-shaped or triangular shaped in cross-sectioned and includes borepluralities pins pins bore pluralities pins surface - Turning to
FIG. 38 , theimplant 234 has a triangular-shaped or wedge-shaped body similar to that shown inFIG. 32 . In this embodiment,tab 252, 254 are pivotally mounted to the triangularshaped body 234. Once theimplant 234 is appropriately positioned in order to distract the spinous processes to the desired amount, thetabs 252, 254 rotate into position in order to hold theimplant 234 in the appropriate position. - In the embodiment of
FIGS. 39 and 40 ,cannula 258 is inserted through a small incision to a position between upper and lower spinous processes. Once the cannula is properly inserted, animplant 260 is pushed through thecannula 258 using aninsertion tool 262. Theimplant 260 includes a plurality of ribs orindentation 264 that assist in positioning theimplant 260 relative to the upper and lower spinal processes. Once theimplant 260 is in position, thecannula 258 is withdrawn so that theimplant 260 comes in contact with and wedges between the spinous processes. Thecannula 258 is somewhat conical in shape with thenose end 266 being somewhat smaller than thedistal end 268 in order to effect the insertion of the cannula into the space between the spinous processes. - Further, a plurality of cannula can be used instead of one, with each cannula being slightly bigger than one before. In the method of the invention, the first smaller cannula would be inserted followed by successively larger cannula being placed over the previous smaller cannula. The smaller cannula would then be withdrawn from the center of the larger cannula. Once the largest cannula is in place, and the opening of the skin accordingly expanded, the implant, which is accommodated by only the larger cannula, is inserted through the larger cannula and into position.
- The
precurved implant 270 inFIGS. 41 and 42 , andprecurved implant 272 inFIG. 43 have common introduction techniques which includes a guide wire, guide tool, orstylet 274. For both embodiments, theguide wire 274 is appropriately positioned through the skin of the patient and into the space between the spinous processes. After this is accomplished, the implant is directed over the guide wire and into position between the spinous processes. The precurved nature of the implant assist in (1) positioning the implant through a first small incision in the patient's skin on one side of the space between two spinous processes and (2) guiding the implant toward a second small incision in the patient's skin on the other side of the space between the two spinous processes. With respect to theimplant 270, the implant includes aconical introduction nose 276 and adistal portion 278. As thenose 276 is inserted between the spinous processes, this causes distraction of the spinous processes.Break lines implant 270. Once the implant is properly positioned over the guide wire between the spinous processes, thenose portion 276 and thedistal portion 278 can be broken off along the break lines, through the above two incisions, in order to leave theimplant 270 in position. - Although only two
break lines implant 270 so that the implant can continue to be fed over theguide wire 278 until the appropriate width of theimplant 270 creates the desired amount of distraction. As described hereinabove, the break lines can be created by perforating or otherwise weakening theimplant 270 so that the appropriate portions can be snapped or sawed off. - With respect to the
precurved implant 272, this implant is similar in design to theimplant 230 shown inFIG. 36 . Thisimplant 272 inFIG. 47 , however, is precurved and inserted over aguide wire 274 to a position between the spinous processes. As withimplant 230 inFIG. 43 , once the appropriate level of this distraction has been reached and if desired, sections of theimplant 272 can be broken, snapped or sawed off as described hereinabove in order to leave a portion of the implant wedged between the upper and lower spinous processes. - A further embodiment of the invention is shown in
FIG. 44 . This embodiment includes a combination insertion tool andimplant 290. The insertion tool andimplant 290 is in the shape of a ring which is hinged atpoint 292. The ring is formed by a first elongated and conically shapedmember 294 and a second elongated and conically shapedmember 296.Members hinge 292 are aligned and meet. Through similar incisions on both sides of the spinous processes, first member and second member are inserted through the skins of the patient and are mated together between the spinous processes. After this has occurred, theimplant 290 is rotated, for example clockwise, so that increasingly widening portions of thefirst member 292 are used to distract the first and second spinous processes. When the appropriate level of distraction has occurred, the remainder of the ring before and after the section which is located between the spinous processes can be broken off as taught hereinabove in order to maintain the desired distraction. Alternatively, with a small enough ring, the entire ring can be left in place with the spinous processes distracted. - In
FIG. 45 , theimplant 300 is comprised of a plurality of rods orstylets 302 which are inserted between the upper and lower spinous processes. The rods are designed much as described hereinabove so that they may be broken, snapped or cut off. Once these are inserted and the appropriate distraction has been reached, the stylets are broken off and a segment of each stylet remains in order to maintain distraction of the spinous process. -
Implant 310 ofFIGS. 46 and 47 is comprised of a shape memory material which coils upon being released. The material is straightened out in adelivery tool 312. The delivery tool is in position between upper and lowerspinous processes delivery end 318 of the delivery tool, the material coils, distracting the spinous processes to the desired amount. Once this distraction has been achieved, the material is cut and the delivery tool removed. - As can be seen in
FIG. 48 , theimplant 320 is delivered between upper and lowerspinous processes delivery tool 326. Once theimplant 320 is in place between the spinous processes, the delivery tool is given a 90° twist so that the implant goes from the orientation as shown inFIG. 49 , with longest dimension substantially perpendicular to the spinous processes, to the orientation shown inFIG. 50 where the longest dimension is in line with and parallel to the spinous processes. This rotation causes the desired distraction between the spinous processes.Implant 320 includes opposedrecesses implant 320 causes the spinous processes to become lodged in these recesses. - Alternatively, the
insertion tool 326 can be used to insertmultiple implants spinous processes 322, 324 (FIG. 51 ).Multiple implants - The embodiment of
FIGS. 52 through 55 b is comprised of a fluid-filleddynamic distraction implant 350. This implant includes amembrane 352 which is placed overpre-bent insertion rod 354 and then inserted through an incision on one side of thespinous process 356. The bent insertion rod, with theimplant 350 thereover, is guided between appropriate spinous processes. After this occurs, theinsertion rod 354 is removed leaving the flexible implant in place. Theimplant 350 is then connected to a source of fluid (gas, liquid, gel and the like) and the fluid is forced into the implant causing it to expand as shown inFIG. 54 , distracting the spinal processes to the desired amount. Once the desired amount of distraction has occurred, theimplant 350 is closed off as is shown inFIG. 55 a. Theimplant 350 being flexible, can mold to the spinous processes which may be of irregular shape, thus assuring positioning. Further, implant 350 acts as a shock absorber, damping forces and stresses between the implant and the spinous processes. - A variety of materials can be used to make the implant and the fluid which is forced into the implant. By way of example only, viscoelastic substances such as methylcellulose, or hyaluronic acid can be used to fill the implant. Further, materials which are initially a fluid, but later solidify, can be inserted in order to cause the necessary distraction. As the materials solidify, they mold into a custom shape about the spinous processes and accordingly are held in position at least with respect to one of two adjacent spinous processes. Thus, it can be appreciated that using this embodiment and appropriate insertion tools the implant can be formed about one spinous process in such a manner that the implant stays positioned with respect to that spinous process (
FIG. 55 b). With such an embodiment, a single implant can be used as an extension stop for spinous process located on either side, without restricting flexion of the spinal column. - It is to be understood that many of the other implants disclosed herein can be modified so that they receive a fluid in order to establish and maintain a desired distraction much in the manner as
implant 350 receives a fluid. - The
implant 360 as shown inFIG. 56 is comprised of a shape memory material such as a plastic or a metal. A curvedintroductory tool 362 is positioned between the appropriate spinous processes as described hereinabove. Once this has occurred, bore 364 of the implant is received over the tool. This act can cause the implant to straighten out. The implant is then urged into position and thereby distracts the spinous processes. When this has occurred, theinsertion tool 362 is removed, allowing the implant to assume its pre-straightened configuration and is thereby secured about one of the spinous processes. Such an arrangement allows for an implant that is an extension stop and does not inhibit flexion of the spinous column. Alternatively, the implant can be temperature sensitive. That is to say that the implant would be more straightened initially, but become more curved when it was warmed by the temperature of the patient's body. - In this embodiment, the
implant 380 is comprised of a plurality of interlocking leaves 382. Initially, a first leaf is positioned between opposedspinous processes leafs 382 are interposed between the spinous processes until the desired distraction has been built up. The leaves are somewhat spring-like in order to absorb the shock and can somewhat conform to the spinous processes. - The
implant 390 ofFIG. 61 includes the placement ofshields spinous processes screw rod 404 is used to hold the distracted position by being screwed into each of the spinous processes through the aperture in the shields using the screws as depicted inFIG. 61 . -
Implant 410 ofFIGS. 62 , 63 is comprised of first andsecond members implant 410.Main member 412 andmating member 414form implant 410. Accordingly, theimplant 410 would have a plurality ofmembers 414 for use with a standardizedfirst member 412.FIGS. 62 and 64 show different types ofmating members 414. InFIG. 62 , themating member 414 includesprojections saddles first member 412. Theseprojections groove 424 is placed between theprojections extension 426 of thefirst member 412. - As shown in
FIG. 63 , the projections of the embodiment shown inFIG. 62 are removed and recesses 428, 430 are substituted therefor. These recesses expand the area of thesaddles - The embodiments of
FIGS. 64 , 65 and 66 are similar in design and concept to the embodiment ofFIGS. 62 and 63 . InFIG. 64 , theimplant 500 includes the first andsecond members Implant 500 includes first andsecond saddles second members saddles FIG. 64 , eachsaddle leg second members FIGS. 62 and 63 , each of the saddles is defined by only a single leg as the ligaments and other tissues associated with the spinous processes can be used to ensure that the implant is held in an appropriate position. With the configuration ofFIG. 64 , it is easier to position the implant relative to the spinous processes as each saddle is defined by only a single leg and thus the first and second members can be more easily worked into position between the various tissues. - In the embodiment of
FIG. 65 , theimplant 520 is comprised of a singlepiece having saddles single leg implant 520 to be positioned between the spinous processes, an incision is made between lateral sides of adjacent spinous processes. Thesingle leg 526 is directed through the incision to a position adjacent to an opposite lateral side of the spinous process with the spinous process cradled in thesaddle 522. The spinous processes are then urged apart untilsaddle 524 can be pivoted into position into engagement with the other spinous process in order to maintain the distraction between the two adjacent spinous processes. - The embodiment of
FIG. 66 is similar to that ofFIG. 65 with animplant 530 and first andsecond saddles tether implant 530. Once appropriately positioned, the tethers can be tied off. It is to be understood that the tethers are not meant to be used to immobilize one spinous process relative to the other, but are used to guide motion of the spinous processes relative to each other so that theimplant 530 can be used as an extension stop and a flexion non-inhibitor. In other words, thesaddles - The
implant 550 is Z-shaped and includes acentral body 552 and first andsecond arms central body 552 of theimplant 550 includes first andsecond saddles second saddles spinous processes arms FIG. 68 ) of thecentral body 552. The first andsecond arms implant 550 toward the spinal canal and keep the implant in place relative to the first and second spinal processes. This prevents the implant from pressing down on the ligamentum flavum and the dura. In a preferred embodiment, the central body would have a height of about 10 mm with each of thearms FIGS. 67 and 68 , the first andsecond arms spinous processes arms arm 554 have a slightly outwardly bowed portion 568 (FIG. 68 ) with adistal end 570 which is slightly inwardly bowed. This configuration allows the arm to fit about the spinous process with thedistal end 570 somewhat urged against the spinous process in order to guide the motion of the spinous process relative to the implant. Thesearms central body 552 by makingarms central body 550. As with the last embodiment, this embodiment can be urged into position between adjacent spinous processes by directing an arm into a lateral incision so that thecentral body 552 can be finally positioned between spinous processes. -
FIGS. 69 , 70 and 71 are perspective front, end, and side views ofimplant 580 of the invention. This implant includes acentral body 582 which has first andsecond saddles implant 580 includes first andsecond arms First arm 588 projects outwardly from thefirst saddle 584 andsecond arm 590 projects outwardly from thesecond saddle 586. In a preferred embodiment, thefirst arm 588 is located adjacent to thedistal end 600 of thecentral body 582 and proceeds only partly along the length of thecentral body 582. Thefirst arm 588 is substantially perpendicular to the central body as shown inFIG. 70 . Further, thefirst arm 588, as well as thesecond arm 590, is anatomically rounded. - The
second arm 590, projecting fromsecond saddle 586, is located somewhat rearward of thedistal end 600, and extends partially along the length of thecentral body 582. Thesecond arm 590 projects at a compound angle from thecentral body 582. As can be seen inFIGS. 70 and 71 , thesecond ann 590 is shown to be at about an angle of 45° from the saddle 586 (FIG. 70 ). Additionally, thesecond arm 590 is at an angle of about 45° relative to the length of thecentral body 580 as shown inFIG. 71 . It is to be understood that other compound angles are within the spirit and scope of the invention as claimed. - In a preferred embodiment, the first and
second arms central body 582. Preferably, the length of each arm is about 10 mm and the width of the central body is about 10 mm. However, the bodies with the widths of 24 mm and greater are within the spirit and scope of the invention, along with first and second arms ranging from about 10 mm to greater than about 24 mm. Further, it is contemplated that the embodiment could include a central body having a width of about or greater than 24 mm with arms being at about 10 mm. - It is to be understood that the embodiment of
FIGS. 69 , 70 and 71 as well as the embodiment ofFIGS. 67 and 68 are designed to preferably be positioned between the L4-L5 and the L5-S1 vertebral pairs. The embodiment ofFIGS. 69 , 70, 71 is particularly designed for the L5-S1 position with the arms being designed to conform to the sloping surfaces found therebetween. The first and second arms are thus contoured so that they lie flat against the lamina of the vertebra which has a slight angle. - The embodiment of
FIGS. 69 , 70, and 71 as with the embodiment ofFIGS. 67 and 68 is Z-shaped in configuration so that it may be inserted from one lateral side to a position between adjacent spinous processes. A first arm, followed by the central body, is guided through the space between the spinous processes. Such an arrangement only requires that a incision on one side of the spinous process be made in order to successfully implant the device between the two spinous processes. - The
implant 610 ofFIG. 71 a is similar to that immediately above with thefirst arm 612 located on the same side of the implant as thesecond arm 614. The first andsecond saddle distal portion -
Implant 630 is also designed so that it can be inserted from one side of adjacent spinous processes. Thisinsert 630 includes acentral body 632 with the first andsecond arms FIG. 72 , aplunger 638 is positioned to extend from an end of thecentral body 632. As shown inFIG. 72 , theplunger 638 is fully extended and as shown inFIG. 73 , theplunger 638 is received within thecentral body 632 of theimplant 630. With the plunger received into theimplant 632, the third and fourth arms or hooks 640, 642 can extend outwardly from thecentral body 632. The third and fourth arms or hooks 640, 642 can be comprised of a variety of materials, such as for example, shape memory metal materials or materials which have a springy quality. - For purposes of positioning the
implant 630 between adjacent spinous processes, theplunger 638 is pulled outwardly as shown inFIG. 72 . Thecentral body 632 is then positioned between adjacent spinous processes and theplunger 638 is allowed to move to the position ofFIG. 73 so that the third andfourth arms central body 632 in order to hold theimplant 630 in position between the spinous processes. -
Plunger 638 can be spring biased to the position as shown inFIG. 73 or can include detents or other mechanisms which lock it into that position. Further, the third and fourth arms themselves, as deployed, can keep the plunger in the position as shown inFIG. 73 . - Other embodiments of the invention are shown in
FIGS. 74 through 78 .FIGS. 74 , 75 and 76disclose implant 700.Implant 700 is particularly suited for implantation between the L4-L5 and L5-S1 vertebra. As can be seen inFIG. 74 , theimplant 700 includes acentral body 702 which has abore 704 provided therein.Bore 704 is used in order to adjust the modulus of elasticity of the implant so that it is preferably approximately two times the anatomical load placed on the vertebra in extension. In other words, theimplant 700 is approximately two times stiffer than the normal load placed on the implant. Such an arrangement is made in order to ensure that the implant is somewhat flexible in order to reduce potential resorption of the bone adjacent to the implant. Other modulus values can be used and be within the spirit of the invention. -
Implant 700 includes first andsecond saddle saddle 706 is defined by first andsecond arms second saddle 708 is defined by third andfourth arms FIG. 74 , thefirst arm 710, in a preferred embodiment, is approximately two times the length of thebody 702 with the second arm being approximately less than a quarter length of the body.Third arm 714 is approximately one times the length of thebody 702 with thefourth arm 716 being, in this preferred embodiment, approximately one and a half times the length of thebody 702. The arms are designed in such a way that the implant (1) can be easily and conveniently inserted between the adjacent spinous processes, (2) will not migrate forwardly toward the spinal canal, and (3) will hold its position through flexion and extension as well as lateral bending of the spinal column. -
First arm 710 is in addition designed to accommodate the shape of the vertebra. As can be seen inFIG. 74 , thefirst arm 710 becomes narrower as it extends away from thebody 702. Thefirst arm 710 includes a slopingportion 718 followed by asmall recess 720 ending in arounded portion 722 adjacent to theend 724. This design is provided to accommodate the anatomical form of for example the L4 vertebra. It is to be understood that these vertebra have a number of surfaces at roughly 30° angles and that the sloping surfaces of this embodiment and the embodiments shown inFIGS. 77 and 78 are designed to accommodate these surfaces. These embodiments can be further modified in order to accommodate other angles and shapes. - The
second arm 712 is small so that it is easy to insert between the spinous processes, yet still define thesaddle 706. Thefourth arm 716 is larger than thethird arm 714, both of which are smaller than thefirst arm 710. The third and fourth arms are designed so that they define thesaddle 706, guide the spinous processes relative to theimplant 700 during movement of the spinal column, and yet are of a size which makes the implant easy to position between the spinous processes. - The procedure, by way of example only, for implanting the
implant 700 can be to make an incision laterally between two spinous processes and then initially insertfirst arm 710 between the spinous processes. The implant and/or appropriate tools would be used to distract the spinous processes allowing thethird leg 714 and thecentral body 702 to fit through the space between the spinous processes. Thethird leg 714 would then come to rest adjacent the lower spinous processes on the opposite side with the spinous processes resting in the first andsecond saddle fourth leg 716 would then assist in the positioning of theimplant 700. -
FIG. 77 includes animplant 740 which is similar toimplant 700 and thus have similar numbering. Thesaddle implant 740 have been cantered or sloped in order to accommodate the bone structure between, by way of example, the L4-L5 and the L5-S1 vertebra. As indicated above, the vertebra in this area have a number of sloping surfaces in the range of about 30°. Accordingly,saddle 706 is sloped at less than 30° and preferably about 20° whilesaddle 708 is sloped at about 30° and preferably more than 30°. - The
implant 760 as shown inFIG. 78 is similar toimplant 700 inFIG. 74 and is similarly numbered.Implant 760 includes third andfourth legs portions fourth arm - Another embodiment of the invention is shown in
FIGS. 79-87 and includes implant 800 (FIG. 86 ).Implant 800 includes adistracting unit 802 which is shown in left side, plan, and right side views ofFIGS. 79 , 80 and 81. A perspective view of the distraction unit is shown inFIG. 84 . The distracting unit as can be seen inFIG. 80 includes adistracting body 804, withlongitudinal axis 805, whichbody 804 has agroove 806 and a rounded orbulbous end 808 which assist in the placement of the distracting body between adjacent spinous process so that an appropriate amount of distraction can be accomplished. Extending from thedistracting body 804 is afirst wing 810 which inFIG. 80 is substantially perpendicular to thedistracting body 804. Such wings which are not perpendicular to the body are within the spirit and scope of the invention.First wing 810 includes aupper portion 812 and alower portion 814. The upper portion 810 (FIG. 79 ) includes arounded end 816 and asmall recess 818. Therounded end 816 and thesmall recess 818 in the preferred embodiment are designed to accommodate the anatomical form or contour of the L4 (for a L4-L5 placement) or L5 (for a L5-S1 placement) superior lamina of the vertebra. It is to be understood that the same shape or variations of this shape can be used to accommodate other lamina of any vertebra. Thelower portion 814 is also rounded in order to accommodate in the preferred embodiment in order to accommodate the vertebrae. The distracting unit further includes a threadedbore 820 which in this embodiment accepts a set screw 822 (FIG. 86 ) in order to hold a second wing 824 (FIGS. 82 , 83) in position as will be discussed hereinbelow. - The threaded bore 820 in this embodiment slopes at approximately 45° angle and intersects the
slot 806. With thesecond wing 824 in position, theset screw 822 when it is positioned in the threadedbore 820 can engage and hold thesecond wing 824 in position in theslot 806. - Turning to
FIGS. 82 , 83 and 85, left side, plan and perspective views of thesecond wing 824 are depicted. Thesecond wing 824 is similar in design to the first wing. The second wing includes anupper portion 826 and alower portion 828. The upper portion includes arounded end 830 and asmall recess 832. In addition, thesecond wing 824 includes aslot 834 which mates with theslot 806 of thedistracting unit 802. Thesecond wing 824 is the retaining unit of the present embodiment. - As can be seen in
FIGS. 83 and 86 , the second wing or retainingunit 824 includes theupper portion 826 having a first width “a” and thelower portion 828 having a second width “b”. In the preferred embodiment, the second width “b” is larger than first width “a” due to the anatomical form or contour of the L4-L5 or L5-S1 laminae. As can be seen inFIG. 83 a in second wing or retainingunit 824, the widths “a” and “b” would be increased in order to, as described hereinbelow, accommodate spinous processes and other anatomical forms or contours which are of different dimensions. Further, as appropriate, width “a” can be larger than width “b”. Thus, as will be described more fully hereinbelow, the implant can include a universally-shapeddistracting unit 802 with a plurality of retainingunits 824, with each of the retaining units having different widths “a” and “b”. During surgery, the appropriatelysized retaining unit 824, width with the appropriate dimensions “a” and “b” can be selected to match to the anatomical form of the patient. -
FIG. 86 depicts an assembledimplant 800 positioned adjacent to upper andlower laminae 836, 838 (which are shown in dotted lines) of the upper and lower vertebrae. Thevertebrae implant 800 as shown inFIG. 86 . Extending upwardly from thevertebrae second wings spinous processes FIG. 86 , and be within the spirit and scope of the invention. - The
implant 800 includes, as assembled, anupper saddle 844 and thelower saddle 846. Theupper saddle 844 has an upper width identified by the dimension “UW”. Thelower saddle 846 has a lower width identified by the dimension “LW”. In a preferred embodiment, the upper width is greater than the lower width. In other embodiments, the “UW” can be smaller than the “LW” depending on the anatomical requirements. The height between the upper andlower saddles FIG. 87 which is a schematic representation of the substantially trapezoidal shape which is formed between the upper and lower saddles. The table below gives sets of dimensions for the upper width, lower width, and height as shown inFIG. 87 . This table includes dimensions for some variations of this embodiment. -
Variation 1 2 3 Upper Width 8 7 6 Lower Width 7 6 5 Height 10 9 8 - For the above table, all dimensions are given in millimeters.
- For purposes of surgical implantation of the
implant 800 into a patient, the patient is preferably positioned on his side (arrow 841 points up from an operating table) and placed in a flexed (tucked) position in order to distract the upper and lower vertebrae. - In a preferred procedure, a small incision is made on the midline of the spinous processes. The spinous processes are spread apart or distracted with a spreader. The incision is spread downwardly toward the table, and the
distracting unit 802 is preferably inserted upwardly between thespinous processes distracting unit 802 is urged upwardly until the distracting orbulbous end 808 and theslot 806 are visible on the other wide of the spinous process. Once this is visible, the incision is spread upwardly away from the table and the retaining unit orsecond wing 824 is inserted into theslot 806 and thescrew 822 is used to secure the second wing in position. After this had occurred, the incisions can be closed. - An alternative surgical approach requires that small incisions be made on either side of the space located between the spinous processes. The spinous processes are spread apart or distracted using a spreader placed through the upper incision. From the lower incision, the
distracting unit 802 is preferably inserted upwardly between thespinous processes distracting unit 802 is urged upwardly until the distracting orbulbous end 808 and theslot 806 are visible through the second small incision in the patient's back. Once this is visible, the retaining unit orsecond wing 824 is inserted into theslot 806 and thescrew 822 is used to secure the second wing in position. After this has occurred, the incisions can be closed. - The advantage of either of the above present surgical procedures is that a surgeon is able to observe the entire operation, where he can look directly down onto the spinous processes as opposed to having to view the procedure from positions which are to the right and to the left of the spinous processes. Generally, the incision is as small as possible and the surgeon is working in a bloody and slippery environment. Thus, an implant that can be positioned directly in front of a surgeon is easier to insert and assemble than an implant which requires the surgeon to shift from side to side. Accordingly, a top-down approach, as an approach along a position to anterior line is preferred so that all aspects of the implantation procedure are fully visible to the surgeon at all times. This aides in the efficient location of (i) the distracting unit between the spinous processes, (ii) the retaining unit in the distracting unit, and (iii) finally the set screw in the distracting unit.
-
FIG. 80 a shows an alternative embodiment of thedistracting unit 802 a. Thisdistracting unit 802 a is similar todistracting unit 802 inFIG. 80 with the exception that the bulbous end 808 a is removable from the rest of thedistracting body 804 a as it is screwed into the threadedbore 809. The bulbous end 808 a is removed once thedistracting unit 802 a is positioned in the patient in accordance with the description associated withFIG. 86 . The bulbous end 808 a can extend past the threadedbore 820 by about 1 cm in a preferred embodiment. - Another embodiment of the invention is shown in
FIGS. 88 , 89, 90 and 91. In this embodiment, the implant is identified by thenumber 900. Other elements ofimplant 900 which are similar toimplant 800 are similarly numbered but in the 900 series. For example, the distracting unit is identified by thenumber 902 and this is in parallel with thedistracting unit 802 of theimplant 800. The distracting body is identified by thenumber 904 in parallel with thedistracting body 804 of theimplant 800. Focusing onFIG. 90 , thedistracting unit 902 is depicted in a perspective view. The distracting unit includesslot 906 which is wider at the top than at the bottom. The reason for this is that the wider upper portion of theslot 906, which is wider than the second wing 924 (FIG. 89 ), is used to, allow the surgeon to easily place thesecond wing 924 into theslot 906 and allow the wedge-shapedslot 906 to guide thesecond wing 924 to its final resting position. As can be see inFIG. 91 , in the final resting position, the largest portion of theslot 906 is not completely filled by thesecond wing 924. - The
end 908 ofimplant 900 is different in that it is more pointed, havingsides flat tip 913 so that thebody 904 can be more easily urged between the spinous processes. - The
distracting unit 902 further includes a tongue-shapedrecess 919 which extends from theslot 906. Located in the tongue-shaped recess is a threadedbore 920. - As can be seen in
FIG. 89 , asecond wing 924 includes atongue 948 which extends substantially perpendicular thereto and between the upper andlower portions tab 948 includes abore 950. With thesecond wing 924 positioned in theslot 906 of thedistracting unit 902 andtab 948 positioned inrecess 919, a threadedset screw 922 can be positioned through thebore 950 and engage the threaded bore 920 in order to secure the second wing or retainingunit 924 to thedistracting unit 902. Theembodiment 900 is implanted in the same manner asembodiment 800 previously described. In addition, as thebore 922 is substantially perpendicular to the distracting body 904 (and not provided at an acute angle thereto), the surgeon can even more easily secure the screw in place from a position directly behind the spinous processes. - Still a further embodiment of the invention is depicted in
FIGS. 92 , and 92 a. In this embodiment, theimplant 1000 as can be seen inFIG. 92 a includes a centralelongated body 1002 which has positioned at one end thereof afirst wing 1004.Wing 1004 is similar to the first wing previously described with respect to the embodiment ofFIG. 88 .Bolt 1006 secureswing 1004 tobody 1002 in this embodiment.Bolt 1006 is received in a bore of thebody 1002 which is along thelongitudinal axis 1008 of body. It is to be understood that in this embodiment, the first unit is defined by thecentral body 1002, thefirst wing 1004, and theguide 1010. - Alternatively, the first wing can be secured to the central body with a press fit and detent arrangement as seen in
FIG. 93 c. In this arrangement, the first wing has aprotrusion 1040 extending preferably about perpendicularly from the first wing, with aflexible catch 1042. The protrusion and flexible catch are press fit into abore 1044 of the central body with the catch received in adetent 1046. - In yet another alternative embodiment, the first wing can be designed as shown in
FIG. 93 d with the protrusion directed substantially parallel to the first wing from a member that joins the first wing to the protrusion. Thus in this embodiment, the first wing is inserted into the body along the same direction as the second wing is inserted. - Positioned at the other end of the
central body 1002 is aguide 1010. In this particular embodiment,guide 1010 is essentially triangularly-shaped so as to be a pointed and arrow-shaped guide. Alternatively,guide 1010 could be in the shape of a cone with lateral truncated sides along thelongitudinal axis 1008.Guide 1010 includes arecess 1012 having a threadedbore 1014.Recess 1012 is for receiving asecond wing 1032 as will be described hereinbelow. - Additionally, it is also to be understood that the
guide 1010 can be bulbous, cone-shaped, pointed, arrow-shaped, and the like, in order to assist in the insertion of theimplant 1000 between adjacent spinous processes. It is advantageous that the insertion technique disturb as little of the bone and surrounding tissue or ligaments as possible in order to (1) reduce trauma to the site and facilitate early healing, and (2) not destabilize the normal anatomy. It is to be noted that with the present embodiment, there is no requirement to remove any of the bone of the spinous processes and depending on the anatomy of the patient, there may be no requirement to remove or sever ligaments and tissues immediately associated with the spinous processes. - The
implant 1000 further includes asleeve 1016 which fits around and is at least partially spaced from thecentral body 1002. As will be explained in greater detail below, while the implant may be comprised of a bio-compatible material such as titanium, the sleeve is comprised preferably of a super-elastic material which is by way of example only, a nickel titanium material (NiTi), which has properties which allow it to withstand repeated deflection without fatigue, while returning to its original shape. The sleeve could be made of other materials, such as for example titanium, but these materials do not have the advantages of a super-elastic material. -
FIG. 93 a is a cross-section through theimplant 1000 depicting thecentral body 1002 and thesleeve 1016. As can be seen from the cross-section ofFIG. 93 a in a preferred embodiment, both thecentral body 1002 and thesleeve 1016 are substantially cylindrical and oval or ecliptically-shaped. An oval or elliptical shape allows more of the spinous process to be supported by the sleeve, thereby distributing the load between the bone and the sleeve more evenly. This reduces the possibility of fracture to the bone or bone resorption. Additionally, an oval or elliptical shape enhances the flexibility of the sleeve as the major axis of the sleeve, as described below, is parallel to the longitudinal direction of the spinous process. However, other shapes such as round cross-sections can come within the spirit and scope of the invention. - In this particular embodiment, the
central body 1002 includes elongatedgrooves 1018, alongaxis 1008, which receives elongatedspokes 1020 extending from the internal surface of thecylinder 1016. - In a preferred embodiment, both the cross-section of the central body and the sleeve have a major dimension along
axis 1022 and a minor dimensional along axis 1024 (FIG. 93 a). Thespokes 1020 are along the major dimension so that along the minor dimension, thesleeve 1016 can have its maximum inflection relative to thecentral body 1002. It is to be understood that the central body along theminor dimension 1024 can have multiple sizes and can, for example, be reduced in thickness in order to increase the ability of thesleeve 1016 to be deflected in the direction of thecentral body 1002. - Alternatively as can be seen in
FIG. 93 b, thecentral body 1002 can include thespokes 1020 and thesleeve 1016 can be designed to include thegrooves 1018 in order to appropriately space thesleeve 1016 from thecentral body 1002. - In other embodiments, the sleeve can have minor and major dimensions as follows:
-
Minor Dimension Major Dimension 6 mm 10 mm 8 mm 10.75 mm 12 mm 14 mm 6 mm 12.5 mm 8 mm 12.5 mm 10 mm 12.5 mm - In one preferred embodiment, said sleeve has a cross-section with a major dimension and a minor dimension and said major dimension is greater than said minor dimension and less than about two times said minor dimension. In said embodiment, said guide has a cross-section which is adjacent to said sleeve with a guide major dimension about equal to said sleeve major dimension and a guide minor dimension about equal to said sleeve minor dimension. Further in said embodiment, said guide extends from said central body with a cross-section which reduces in size in a direction away from said central body.
- In another preferred embodiment, said guide is cone-shaped with a base located adjacent to said sleeve. Further, said guide has a base cross-section about the same as the oval cross-section of said sleeve.
- Thus, from the above, it is evident that preferably a major dimension of the sleeve correspond with a major dimension of the central body and a minor dimension of the sleeve corresponds with a minor dimension of the central body. Additionally, it is evident that the major dimension of the
sleeve 1016 is substantially perpendicular to a major dimension of thefirst wing 1004 along longitudinal axis 1030 (FIG. 92 a). This is so that as discussed above, when theimplant 1000 is properly positioned between the spinous processes, a major portion of the sleeve comes in contact with both the upper and lower spinous processes in order to distribute the load of the spinous processes on thesleeve 1016 during spinal column extension. - As indicated above, the preferred material for the
sleeve 1016 is a super-elastic material and more preferably one comprised of an alloy of nickel and titanium. Such materials are available under the trademark Nitinol. Other super-elastic materials can be used as long as they are bio-compatible and have the same general characteristics of super-elastic materials. In this particular embodiment, a preferred super-elastic material is made up of the following composition of nickel, titanium, carbon, and other materials as follows: -
Nickel 55.80% by weight Titanium 44.07% by weight Carbon <0.5% by weight Oxygen <0.5% by weight - In particular, this composition of materials is able to absorb about 8% recoverable strain. Of course, other materials which can absorb greater and less than 8% can come within the spirit and scope of the invention. This material can be repeatably deflected toward the central body and returned to about its original shape without fatigue. Preferably and additionally, this material can withstand the threshold stress with only a small amount of initial deforming strain and above the threshold stress exhibit substantial and about instantaneous deformation strain which is many times the small amount of initial deforming strain. Such a characteristic is demonstrated in
FIG. 118 where it is shown that above a certain threshold stress level, deformation strain is substantially instantaneous up to about 8%.FIG. 118 shows a loading and unloading curve between stress and deformation strain for a typical type of super-elastic material as described above. - Preferably, the above super-elastic material is selected to allow deformation of up to about, by way of example only, 8%, at about 20 lbs. to 50 lbs. force applied between a spinous processes. This would cause a sleeve to deflect toward the central body absorbing a substantial amount of the force of the spinous processes in extension. Ideally, the sleeves are designed to absorb 20 lbs. to 100 lbs. before exhibiting the super-elastic effect (threshold stress level) described above. Further, it is possible, depending on the application of the sleeve and the anatomy of the spinal column and the pairs of spinous processes for a particular individual, that the sleeve can be designed for a preferable range of 20 lbs. to 500 lbs. of force before the threshold stress level is reached. Experimental results indicate that with spinous processes of an older individual, that at about 400 pounds force, the spinous process may fracture. Further, such experimental results also indicate that with at least 100 pounds force, the spinous process may experience some compression. Accordingly, ideally the super-elastic material is designed to deform or flex at less than 100 pounds force.
- In a preferred embodiment, the wall thickness of the sleeve is about 1 mm or 40/1000 of an inch (0.040 in.). Preferably the sleeve is designed to experience a combined 1 mm deflection. The combined 1 mm deflection means that there is ½ mm of deflection at the top of the minor dimension and a ½ mm deflection at the bottom of the minor dimension. Both deflections are toward the central body.
- In a particular embodiment where the sleeve is more circular in cross-section, with an outer dimension of 0.622 in. and a wall thickness of 0.034 in., a 20 lb. load causes a 0.005 in. deflection and a 60 lb. load causes a 0.020 in. deflection (approximately ½ mm). A 100 lb. load would cause a deflection of about 0.04 in. or approximately 1 mm.
- Thus in summary, the above preferred super-elastic material means that the sleeve can be repeatedly deflected and returned to about its original shape without showing fatigue. The sleeve can withstand a threshold stress with a small amount of deforming strain and at about said threshold stress exhibit about substantially instantaneous deformation strain which is many times the small amount of the forming strain. In other words, such super-elastic qualities mean that the material experiences a plateau stress where the material supports a constant force (stress) over very large strain range as exhibited in
FIG. 118 . - It is to be understood that for this particular embodiment, bar stock of the super-elastic material is machined into the appropriate form and then heat treated to a final temperature to set the shape of the material by increasing the temperature of the material to 932° Fahrenheit and holding that temperature for five (5) minutes and then quickly quenching the sleeve in water. It is also to be understood that preferably the present nickel titanium super-elastic alloy is selected to have a transition temperature Af of about 59° Fahrenheit (15° C.). Generally for such devices the transition temperature can be between 15° C. to 65° C. (59° F. to 149° F.), and more preferably 10° C. to 40° C. (50° F. to 104° F.). Preferably, the material is maintained in the body above the transition temperature in order to exhibit optimal elasticity qualities.
- Alternatively, and preferably, the sleeve can be fabricated by wire Electrical Discharge Machining (EDM) rather than machined. Additionally, the sleeve can be finished using a shot blast technique in order to increase the surface strength and elasticity of the sleeve.
- Top and side views of the
second wing 1032 are shown inFIGS. 94 and 95 .Second wing 1032 as in several past embodiments includes atab 1034 with abore 1036 which aligns with thebore 1014 of theguide 1010. In this particular embodiment, thesecond wing 1032 includes a cut-out 1038 which is sized to fit over theguide 1010, with thetab 1034 resting in therecess 1012 of theguide 1010. - An alternative configuration of the
second wing 1032 is depicted inFIG. 94 a. In this configuration, thesecond wing 1032 is held at acute angle with respect to thetab 1034. This is different from the situation in the embodiment ofFIGS. 94 and 95 where the second wing is substantially perpendicular to the tab. For the embodiment of the second wing inFIG. 94 a, such embodiment will be utilized as appropriate depending on the shape of the spinous processes. - With respect to the alternative
second wing 1032 depicted inFIGS. 94 b and 95 a,elongated tab 1034 has a plurality of closely positioned bores 1036. The bores, so positioned, appear to form a scallop shape. Each individual scallop portion of thebore 1036 can selectively hold the bolt in order to effectively position thesecond wing 1032 in three different positions relative to thefirst wing 1004. The cut-out 1038 (FIG. 95 a of this alternative embodiment) is enlarged over that ofFIG. 95 as in a position closest to thefirst wing 1004, thesecond wing 1032 is immediately adjacent and must conform to the shape of thesleeve 1016. -
Implant 1050 ofFIG. 97 is similar to theimplant 1000 inFIG. 92 with the major difference being that a second wing is not required. Theimplant 1050 includes a central body as doesimplant 1000. The central body is surrounded by asleeve 1016 which extends between afirst wing 1004 and aguide 1010. Theguide 1010 in this embodiment is substantially cone-shaped without any flats and with no bore as there is no need to receive a second wing. The sleeve and the central body as well as the first wing and guide act in a manner similar to those parts of theimplant 1000 inFIG. 92 . It is to be understood a cross-section of thisimplant 1050 throughsleeve 1016 can preferably be likeFIG. 93 a. This particular embodiment would be utilized in a situation where it was deemed impractical or unnecessary to use a second wing. This embodiment has the significant advantages of the sleeve being comprised of super-elastic alloy materials as well as the guide being utilized to guide the implant between spinous processes while minimizing damage to the ligament and tissue structures found around the spinous processes. -
Implant 1060 is depicted inFIG. 98 . This implant is similar to theimplants 1000 ofFIG. 92 and theimplant 1050 ofFIG. 97 , except that this implant does not have either first or second wings.Implant 1060 includes asleeve 1016 which surrounds a central body just ascentral body 1002 ofimplant 1000 inFIG. 93 . It is to be understood that a cross-section of thisimplant 1060 throughsleeve 1016 can preferably be likeFIG. 93 a.Implant 1060 includes aguide 1010 which in this preferred embodiment is cone-shaped.Guide 1010 is located at one end of the central body. At the other end is astop 1062.Stop 1062 is used to contain the other end of thesleeve 1016 relative to the central body. This embodiment is held together with a bolt such asbolt 1006 ofFIG. 93 that is used for the immediate above two implants. For theimplant 1060 ofFIG. 98 , such a device would be appropriate where the anatomy between the spinous processes was such that it would be undesirable to use either a first or second wing. However, this embodiment affords all the advantageous described hereinabove (FIGS. 92 and 97 ) with respect to the guide and also with respect to the dynamics of the sleeve. -
FIGS. 99 and 100 depict animplant system 1070.Implant system 1070 includes asleeve 1072 which is similar to and has the advantageous ofsleeve 1016 of the embodiment inFIG. 92 .Sleeve 1072 does not, however, have any spokes. Additionally,implant system 1070 includes aninsertion tool 1074.Insertion tool 1074 includes aguide 1076 which in a preferred embodiment is substantially cone-shaped.Guide 1076 guides the insertion of thesleeve 1072 and theinsertion tool 1074 between adjacent spinous processes. Theinsertion tool 1074 further includes acentral body 1078, astop 1080, and ahandle 1082. Theguide 1076 at its base has dimensions which are slightly less than the internal dimensions of thesleeve 1074 so that the sleeve can fit over theguide 1076 and rest against thestop 1080. Thetool 1074 with theguide 1076 is used to separate tissues and ligaments and to urge thesleeve 1072 in the space between the spinous processes. Once positioned, theguide insertion tool 1074 can be removed leaving thesleeve 1072 in place. If desired, after the sleeve is positioned, position maintaining mechanisms such asspringy wires 1084 made out of appropriate material such as the super-elastic alloys and other materials including titanium, can be inserted using a cannula through the center of thesleeve 1072. Once inserted, the ends of the retaining wires 1084 (FIG. 99 ) extend out of both ends of thesleeve 1072, and due to this springy nature, bent at an angle with respect to the longitudinal axis of thesleeve 1072. These wires help maintain the position of the sleeve relative to the spinous processes. - Another embodiment of the invention can be seen in
FIG. 101 which includesimplant 1100.Implant 1100 has many similar features that are exhibited with respect toimplant 1000 inFIG. 92 . Accordingly, elements with similar features and functions would be similarly numbered. Additionally, features that are different fromimplant 1100 can be, if desired, imported into and become a part of theimplant 1000 ofFIG. 92 . - As with
implant 1000,implant 1100 includes a central body 1002 (FIG. 102 ) with afirst wing 1004 and abolt 1006 which holds the first wing and the central body together. In this particular embodiment, the central body is made in two portions. Thefirst portion 1102 is in the shape of a truncated cone with an oval or elliptical base and asecond portion 1104 includes a cylindrical central portion with a distal end in the shape of atruncated cone 1103 with an oval or elliptical base. In addition, in this particular embodiment, formed with the central body is theguide 1010 which has an oval or elliptical base.Bolt 1006 is used to secure the first wing through thesecond portion 1104 with thefirst portion 1102 held in-between. In this particular embodiment, theguide 1010 in addition to includingrecess 1012 and bore 1014 includes agroove 1106 which receives a portion of thesecond wing 1032. - In this particular embodiment, the
sleeve 1016 is preferably oval or elliptical in shape as can be seen inFIG. 102 a. The central body can be oval, elliptical or circular in cross-section, although other shapes are within the spirit and scope of the invention. Thesleeve 1016 held in position due to the fact that the truncatedconical portion 1102 and the corresponding truncatedconical portion 1103 each have a base that is elliptical or oval in shape. Thus, the sleeve is held in position so that preferably the major dimension of the elliptical sleeve is substantially perpendicular to the major dimension of the first wing. It is to be understood that if the first wing is meant to be put beside the vertebrae so that the first wing is set at an angle other than perpendicular with respect to the vertebrae and that the sleeve may be held in a position so that the major dimension of the sleeve is at an angle other than perpendicular to the major dimension of the first wing and be within the spirit and scope of the invention. This could be accomplished by tighteningbolt 1006 with thefirst wing 1004 andsleeve 1016 so positioned. In such a configuration, the major dimension of the sleeve would be preferably positioned so that it is essentially parallel to the length of the adjacent spinous processes. So configured, the elliptical or oval shape sleeve would bear and distribute the load more evenly over more of its surface. - It is to be understood that the sleeve in this embodiment has all the characteristics and advantages described hereinabove with respect to the above-referenced super-elastic sleeves.
- The second wing as discussed above, can come in a variety of shapes in order to provide for variations in the anatomical form of the spinous processes. Such shapes are depicted in
FIGS. 103 , 104, 105, 106, and 107. In each configuration, thesecond wing 1032 has aupper portion 1108 and alower portion 1110. InFIG. 104 , the lower portion is thicker than the upper portion in order to accommodate the spinous process, where the lower spinous process is thinner than the upper spinous process. InFIG. 105 , both the upper and lower portions are enlarged over the upper and lower portions ofFIG. 103 to accommodate both the upper and lower spinous processes being smaller. That is to say that the space between the upper and lower portions of the first and second wings are reduced due to the enlarged upper and lower portions of the second wing. - Alternative embodiments of second wings, as shown in
FIGS. 104 and 105 , are depicted inFIGS. 106 and 107 . In theseFIGS. 106 and 107 , thesecond wing 1032 accommodates the same anatomical shape and size of the spinous processes as does the second wing inFIGS. 104 and 105 respectively. However, in the embodiments of thesecond wing 1032 ofFIGS. 106 and 107 , substantial masses have been removed from the wings. The upper andlower portions central portion 1112 of thesecond wing 1032. - It is to be understood that in this embodiment, if desired, the second wing may not have to be used, depending on the anatomy of the spinal column of the body, and this embodiment still has the significant advantages attributable to the
guide 1010 and the functionality of thesleeve 1016. - The
implant 1120 as shown inFIGS. 108 and 109 , is similar toimplant 1100 which is in turn similar toimplant 1000. Such similar details have already been described above and reference here is made to the unique orientation of the first andsecond wings longitudinal axis second wings FIG. 108 , they would meet to form an A-frame structure as is evident from the end view ofFIG. 109 . In this particular embodiment, as can be seen inFIGS. 109 and 110 , thetab 1034 is provided an acute angle to the remainder of thesecond wing 1124. Further, thegroove 1018 formed in the implant is sloped in order to accept thesecond wing 1124. Accordingly, thispresent implant 1120 is particularly suited for an application where the spinous process is wider adjacent to the vertebral body and then narrows in size at least some distance distally from the vertebral body. It is to be understood that a cross-section of thisimplant 1120 throughsleeve 1016 can preferably be likeFIG. 93 a. - An additional embodiment of the
implant 1150 is shown inFIG. 111 .Implant 1150 has features similar to those described with respect toFIG. 94 b. -
Implant 1150 includes acentral body 1152 with afirst wing 1154, wherecentral body 1152 includes elongatedgroove 1156 which extends to theguide 1158. Ascrew 1160 is received in a threaded bore located in theelongated groove 1156. - The
second wing 1162 includes acentral body 1164 which is substantially perpendicular to thesecond wing 1162. - The
central body 1164 includes a plurality ofbores 1166 provided therein. These bores are formed adjacent to each other in order to define a plurality of scallops, each scallop capable of retainingbolt 1160 therein. As can be seen inFIG. 114 , the second wing includes a cut-out 1168 such that with thecentral body 1164 of the second wing received in thegroove 1156 of the central body associated with the first wing, the remainder of the second wing is received over thecentral body 1152 of theimplant 1150. With thisimplant 1150, the distance between the first and second wings can be adjusted by selectively placing thebolt 1160 through one of the five specified bores defined by the scalloped plurality ofbores 1166. Accordingly,FIG. 112 depicts the implant where the first and second wings are widest apart in order to accommodate spinous processes of greater thickness.FIG. 111 shows the middle position between the first and second wings in order to accommodate average size spinous processes. - It is to be understood that preferably during the surgical process, the
central body 1152 is urged between spinous processes. After this has occurred, the second wing is guided by the other sides of the spinous processes from a path which causes the plane of the second wing to move substantially parallel to the plane of the first wing until thecentral body 1164 associated with thesecond wing 1162 is received in the groove of 1156 of thecentral body 1152 associated with thefirst wing 1154. After this has occurred, thebolt 1160 is positioned through aligned bores associated with thesecond wing 1162 and thecentral body 1152 in order to secure the second wing to the central body. - While
embodiment 1150 does not depict a sleeve such assleeve 1016, such asleeve 1016 could be placed overbody 1152 and be within the spirit of the invention. - From the above, it is evident that the present invention can be used to relieve pain caused by spinal stenosis in the form of, by way of example only, central canal stenosis or foraminal (lateral) stenosis. These implants have the ability to flatten the natural curvature of the spine and open the neural foramen and the spacing between adjacent vertebra to relieve problems associated with the above-mentioned lateral and central stenosis. Additionally, the invention can be used to relieve pain associated with facet arthropathy. The present invention is minimally invasive and can be used on an outpatient basis.
- Additional aspects, objects and advantages of the invention can be obtained through a review of the appendant claims and figures.
- It is to be understood that other embodiments can be fabricated and come within the spirit and scope of the claims.
Claims (23)
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US09/175,645 US6068630A (en) | 1997-01-02 | 1998-10-20 | Spine distraction implant |
US09/474,038 US6332882B1 (en) | 1997-01-02 | 1999-12-28 | Spine distraction implant |
US09/842,756 US6699247B2 (en) | 1997-01-02 | 2001-04-26 | Spine distraction implant |
US10/732,589 US20050101955A1 (en) | 1997-01-02 | 2003-12-10 | Spine distraction implant |
US67717507A | 2007-02-21 | 2007-02-21 | |
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US11/677,145 US20070265624A1 (en) | 1997-01-02 | 2007-02-21 | Spine distraction implant and method |
US11/677,195 US8672974B2 (en) | 1997-01-02 | 2007-02-21 | Spine distraction implant and method |
US11/692,306 US20080172057A1 (en) | 1997-01-02 | 2007-03-28 | Spine distraction implant and method |
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US09/124,203 Expired - Lifetime US6090112A (en) | 1997-01-02 | 1998-07-28 | Spine distraction implant and method |
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US09/361,510 Expired - Fee Related US6379355B1 (en) | 1997-01-02 | 1999-07-27 | Spine distraction implant and method |
US09/473,184 Expired - Lifetime US6238397B1 (en) | 1997-01-02 | 1999-12-28 | Spine distraction implant and method |
US09/507,755 Expired - Lifetime US6280444B1 (en) | 1997-01-02 | 2000-02-18 | Spine distraction implant and method |
US09/684,748 Expired - Lifetime US6419676B1 (en) | 1997-01-02 | 2000-10-06 | Spine distraction implant and method |
US09/686,150 Expired - Fee Related US6451020B1 (en) | 1997-01-02 | 2000-12-07 | Spine distraction implant and method |
US09/754,534 Expired - Fee Related US6419677B2 (en) | 1997-01-02 | 2001-01-04 | Spine distraction implant and method |
US09/808,827 Expired - Fee Related US6478796B2 (en) | 1997-01-02 | 2001-03-15 | Spin distraction implant and method |
US11/692,306 Abandoned US20080172057A1 (en) | 1997-01-02 | 2007-03-28 | Spine distraction implant and method |
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US09/018,479 Expired - Lifetime US6074390A (en) | 1997-01-02 | 1998-02-05 | Spine distraction implant and method |
US09/124,203 Expired - Lifetime US6090112A (en) | 1997-01-02 | 1998-07-28 | Spine distraction implant and method |
US09/360,955 Expired - Lifetime US6149652A (en) | 1997-01-02 | 1999-07-27 | Spine distraction implant and method |
US09/361,513 Expired - Fee Related US6500178B2 (en) | 1997-01-02 | 1999-07-27 | Spine distraction implant and method |
US09/361,510 Expired - Fee Related US6379355B1 (en) | 1997-01-02 | 1999-07-27 | Spine distraction implant and method |
US09/473,184 Expired - Lifetime US6238397B1 (en) | 1997-01-02 | 1999-12-28 | Spine distraction implant and method |
US09/507,755 Expired - Lifetime US6280444B1 (en) | 1997-01-02 | 2000-02-18 | Spine distraction implant and method |
US09/684,748 Expired - Lifetime US6419676B1 (en) | 1997-01-02 | 2000-10-06 | Spine distraction implant and method |
US09/686,150 Expired - Fee Related US6451020B1 (en) | 1997-01-02 | 2000-12-07 | Spine distraction implant and method |
US09/754,534 Expired - Fee Related US6419677B2 (en) | 1997-01-02 | 2001-01-04 | Spine distraction implant and method |
US09/808,827 Expired - Fee Related US6478796B2 (en) | 1997-01-02 | 2001-03-15 | Spin distraction implant and method |
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US7909870B2 (en) | 2003-12-11 | 2011-03-22 | Tpl - Kilian Kraus | Height-adjustable spinal implant and operating instrument for the implant |
US8012207B2 (en) | 2004-10-20 | 2011-09-06 | Vertiflex, Inc. | Systems and methods for posterior dynamic stabilization of the spine |
US8123807B2 (en) | 2004-10-20 | 2012-02-28 | Vertiflex, Inc. | Systems and methods for posterior dynamic stabilization of the spine |
US8123782B2 (en) | 2004-10-20 | 2012-02-28 | Vertiflex, Inc. | Interspinous spacer |
US8128662B2 (en) | 2004-10-20 | 2012-03-06 | Vertiflex, Inc. | Minimally invasive tooling for delivery of interspinous spacer |
US8152837B2 (en) | 2004-10-20 | 2012-04-10 | The Board Of Trustees Of The Leland Stanford Junior University | Systems and methods for posterior dynamic stabilization of the spine |
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US6280444B1 (en) | 2001-08-28 |
US6419676B1 (en) | 2002-07-16 |
DE69738301T2 (en) | 2008-09-18 |
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US6090112A (en) | 2000-07-18 |
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US6379355B1 (en) | 2002-04-30 |
US6419677B2 (en) | 2002-07-16 |
US6500178B2 (en) | 2002-12-31 |
US20010039452A1 (en) | 2001-11-08 |
US5836948A (en) | 1998-11-17 |
US6478796B2 (en) | 2002-11-12 |
US6074390A (en) | 2000-06-13 |
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US6451020B1 (en) | 2002-09-17 |
US6238397B1 (en) | 2001-05-29 |
US20010007073A1 (en) | 2001-07-05 |
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