US20110218580A1 - Bone fixation system with curved profile threads - Google Patents
Bone fixation system with curved profile threads Download PDFInfo
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- US20110218580A1 US20110218580A1 US12/719,316 US71931610A US2011218580A1 US 20110218580 A1 US20110218580 A1 US 20110218580A1 US 71931610 A US71931610 A US 71931610A US 2011218580 A1 US2011218580 A1 US 2011218580A1
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- thread
- head
- bone
- implant
- bone fastener
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- 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
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
- A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
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- 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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
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- 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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts 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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
Abstract
Description
- The present disclosure generally relates to a bone fastener such as a bone screw or bone peg for use in orthopedic surgery, preferably for fixing an implant such as a bone plate to bone. The disclosure further relates to an implant system for fixation of bone.
- Bone screws are available in a plurality of variations for different applications. Bone screws which can be secured to a bone plate or a similar implant are also known as locking screws. For locking the bone screw to the bone plate, a head of the bone screw is provided with a thread that mates with a corresponding thread on an inner surface of a plate hole.
- U.S. Patent Publication Nos. 2005/0277937 and 2009/0192550 relate to a typical locking screw which is intended to be secured to a bone plate. The head of the bone screw has a spherical shape and a thread with V-shaped ridges. The thread of the head is a double lead thread which mates with an internal thread of a plate hole. The ridges of the thread provided in the plate hole have a defined angle relative to the plate, whereby the bone screw is correspondingly fixed to the bone plate at a predetermined angle.
- The threaded head of a locking screw may also have a cylindrical or conical shape. U.S. Pat. No. 7,179,260 and U.S. Patent Publication No. 2007/0276386 relate to a bone plate system comprising a locking screw with such a head. The screw head is completely or partially threaded to be received in a threaded plate hole. U.S. Patent Publication No. 2005/0261688 relates to a further bone screw having a conically-tapered and threaded head. The flanks and peaks of the threaded head have a trapezoidal shape for mating with internal threads of a plate hole.
- EP 0 230 678 A1 relates to an endosteal screw-implant used in dentistry comprising a shaft and a conical head with a spherically shaped portion. The shaft of the screw has a thread which is cylindrically shaped and rounded on its external edges for fixing the shaft into a jaw bone.
- The conventional bone fasteners for locking applications have several drawbacks. During the screwing-in operation of the bone fastener head into the implant, the thread of a head of the fastener can tilt and jam within the threaded portion of the implant hole. Thereby, the flanks and peaks of the threaded head and the threaded hole may get damaged. Moreover, splinters from the bone drilling as well as other materials like parts of human tissue can contaminate the edges and grooves of the threads, whereby the thread of the threaded head and the internal thread of the hole of the implant can jam.
- Aspects of the present disclosure are directed to facilitate an easy screwing-in of a threaded bone fastener head into a bone plate or any other implant without jamming.
- According to a first aspect, there is provided a bone fastener for use in orthopedic surgery for fixing an implant to bone, wherein the bone fastener comprises a shaft configured to engage bone and a head having a thread, for example, a helical thread on an outer surface to engage the implant. The thread has a profile in cross section including peaks, wherein the peaks have a curved shape.
- Each curved peak of the bone fastener can form an arc segment. The arc segment may be derived from a regular circle or a symmetrically or asymmetrically deformed circle (e.g., from an ellipse). A radius of curvature of the arc segment can be between 0.05 mm and 3.0 mm, in particular between 0.1 mm and 1.0 mm. An angular range of the arc segment can be between 30° and 200°, in particular between 45° and 180°. Independently therefrom, an angle between a plane including the core diameter of the head and a tangent of the arc segment may be between −10° and 90°, in particular between 0° and 50°. Each curved peak of the bone fastener may be defined by a height h which extends from a plane defined by the core of the head to the top of the peak. This height h of the peak can be between 0.1 mm and 3.0 mm, in particular between 0.15 mm and 1.5 mm.
- The curved peaks can be provided immediately adjacent to each other. Alternatively, the curved peaks can be separated from each other by valleys. In one possible implementation, the valleys have a planar profile. The valleys can also have a rounded, V-shaped, U-shaped or trapezoidally shaped profile in cross section.
- Further, the thread of head can include non-curved (e.g., straight) or curved thread flanks. The flanks may connect the peaks and valleys. Each curved flank may be defined by an arc segment. The flanks may generally have a different curvature (e.g., in the opposite direction and/or of a different curvature radius) than the arc segments defining the peaks.
- The thread of the head may be a multiple thread such as a double thread. Moreover, the thread of the head can have a constant thread pitch. The thread pitch of the thread of the head may be between 0.1 mm and 5.0 mm, in particular between 0.25 mm and 3.0 mm. The thread of the head may have a thread depth between 0.1 mm and 3.0 mm, in particular between 0.15 mm and 1.5 mm.
- The head can have a length between 1.0 mm and 10 mm and a core diameter between 1.0 mm and 20.0 mm. Further, the head may have an outer diameter between 1.0 mm and 20.0 mm. The head can have a generally conical or curved (e.g., spherical) shape. The head may also be cylindrical. Further, the outer diameter of the head can be the same as or greater than the outer diameter of the shaft.
- The shaft of the bone fastener may have a core diameter between 1.0 mm and 20.0 mm. The shaft can be unthreaded or at least partially threaded. Generally, a bone fastener having an at least partially threaded shaft can also be referred to as bone screw, whereas a bone fastener with an unthreaded shaft will be referred to as bone peg. The bone screw can be a self-tapping screw or a self-drilling screw. Alternatively, the shaft may take the form of an un-threaded pin or rod.
- The head can have a constant core diameter. Alternatively, the core of the head can have a conical or curved (e.g., spherical) shape. In all cases, an outer diameter of the thread of the head may gradually change in a curved (e.g., spherical) or tapering manner.
- According to a further aspect, there is provided an implant system for use in orthopedic surgery for fixation of bone. The implant system comprises an implant having an upper surface and a lower surface, at least one hole extending through the upper surface and lower surface, and at least one bone fastener. The at least one bone fastener comprises a shaft configured to engage bone, and a head having a thread on an outer surface to engage the implant, wherein the thread has a profile in cross section including peaks, wherein the peaks have a curved shape.
- Due to the rounded shape of the peaks of the thread of the head of the bone fastener, the engagement of the thread in a hole of the implant is improved. Further, tilting and jamming is avoided during the screwing-in operation of the threaded bone fastener head into the implant.
- In the aspect described above, the at least one plate hole may include an at least partially threaded portion configured to mate with the thread of the head of the at least one bone fastener. Alternatively, a thread in the plate hole may be formed by the thread of the screw thread engaging the plate hole as generally described in DE 43 43 117 A. In both cases, the parameters of the thread provided in the hole can be similar or identical to the parameters of the thread of the head of the bone fastener as defined herein. In particular, the thread of the hole may have a profile in cross section including peaks and valleys, wherein the peaks and/or valleys have a curved shape.
- The at least one hole can include an unthreaded upper portion and a lower threaded portion configured to mate with the thread of the head of the at least one bone fastener. In this case, the upper portion of the at least one hole can have an inward taper with a conical or curved (e.g., spherical) shape.
- The threaded portion of the at least one hole can taper towards the lower surface of the implant. Moreover, the threaded portion of the at least one hole can have a multiple thread (e.g., a double thread).
- The at least one hole can have a central axis which can be oblique relative to a vertical axis of the implant. An angle defined between the central axis and the vertical axis can be between 0° and 60°. Alternatively, the at least one hole may be oblique relative to the upper surface or lower surface of the implant.
- These and other features, aspects and advantageous of the present disclosure will become apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein:
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FIG. 1 is a side view of a first bone fastener embodiment; -
FIG. 2 is a side view of a second bone fastener embodiment; -
FIG. 3 is a side view of a third bone fastener embodiment; -
FIG. 4 is a side view of a fourth bone fastener embodiment; -
FIG. 5 is a detailed view of peaks of the thread of the bone fastener head shown inFIGS. 2 and 4 ; -
FIG. 6 is a cross-sectional view of the screw head shown inFIGS. 1 and 3 ; -
FIG. 7 is a cross-sectional view of a screw head shown inFIGS. 2 and 4 ; -
FIG. 8 is a detailed view of another screw head embodiment; -
FIG. 9 is a detailed view of another screw head embodiment; -
FIG. 10 is a cross-sectional view of a dummy implant embodiment; -
FIG. 11 is a side view of another dummy implant embodiment; -
FIG. 11A is a top view of the plate ofFIG. 11 and; -
FIG. 12 is a cross-sectional view of the implant shown inFIG. 11 . - Referring to
FIG. 1 shown, there is shows a side view of a first embodiment of a bone fastener in the form of abone screw 10 for use as a locking screw in orthopedic surgery for fixing an implant (not shown inFIG. 1 ) to bone. Thebone screw 10 comprises ashaft 12 configured to engage bone and ahead 14 having athread 16 on anouter surface 18 to engage the implant. Thebone screw 10 has a length 1 between 10 mm and 300 mm. Thehead 14 is provided at a distal side of theshaft 12 and atip 20 is provided at a proximal side of theshaft 12. Thetip 20 is formed as a cone having an opening angle s of typically 60° to 120°. In the present embodiment the angle s is approximately 90°. - Further, as illustrated in
FIG. 1 , the shaft has a threadedportion 22. Trapezoidally shaped peaks of the threadedportion 22 are separated by valleys having a planar profile in cross section. The threadedportion 22 of the shaft has a constant thread pitch. The threadedportion 22 extends from thetip 20 to anon-threaded portion 24 adjacent the head end ofshaft 12. - The thread of the threaded
portion 22 of the shaft is formed as a conventional self-tapping thread, wherein two helically winding cuttinggrooves 26 are provided at the proximal end of theshaft 12 near thetip 20 for feeding material away. In this cutting area, theshaft 12 has a greater core diameter. However, the outer diameter of the thread of the threadedportion 22 is constant along the whole length of threadedportion 22 in axial direction of thebone screw 10. Thereby, the force during screwing-in thebone screw 10 into bone is reduced. - As shown in
FIG. 1 , thehead 14 ofbone screw 10 is adjacent to thenon-threaded portion 24 ofshaft 12, and the core diameter of thehead 14 is greater than the core diameter of theshaft 12. Further, the core of thescrew head 14 has a conical shape and an outer diameter of thethread 16 of thehead 14 gradually tapers inwardly toward thenon-threaded portion 24 ofbone screw 10. Thethread 16 may be a multiple thread in the form of a double thread (i.e., a double-lead thread). - As also illustrated in
FIG. 1 , thethread 16 of thescrew head 14 has a profile in crosssection including peaks 28 provided immediately adjacent to each other. Each of thepeaks 28 has a curved shape defined by an arc segment derived from a circle. A radius of curvature of the arc segment amounts to 0.25 mm and an angular range of the arc segment is 78°. Thethread 16 of thehead 14 also has a constant thread pitch of approximately 1 mm. -
FIG. 2 illustrates in a side view another embodiment of abone screw 30 having ashaft 12 to engage bone and ahead 14 to engage an implant. The difference between the bone screw shown inFIG. 1 and thescrew 30 shown inFIG. 2 is that thethread 32 is a single-lead thread with thecurved peaks 28 of thethread 32 being separated from each other byvalleys 34 having a planar profile in cross section. Thesingle thread 32 of thehead 14 has the same pitch as each individual thread of thedouble thread 16 of the screw head shown inFIG. 1 . Moreover, thehead 14 again has a conical shape. Theshaft 12 of thebone screw 30 is formed in the same manner as the shaft of thebone screw 10 shown inFIG. 1 . As can be seen inFIGS. 1 and 2 , the thread of thebone screw head 14 can extend along the entire length of the head in the axial direction of the screw. -
FIG. 3 shows a side view of abone screw 36 according to another embodiment. Thebone screw 36 is essentially a combination of thescrew head 14 having the thread configuration ofthread 16 shown inFIG. 1 and a modifiedshaft 38. Theshaft 38 ofbone screw 36 comprises atip 40 at its proximal end, a threadedportion 42 and anon-threaded portion 44. Thenon-threaded portion 44 is provided adjacent the head end ofshaft 38 and is adjacent to screwhead 14, and the threadedportion 42 extends from thenon-threaded portion 44 to thetip 40. The threadedportion 42 ofshaft 38 includes a compression thread which has a large thread depth between 0.1 mm and 3.0 mm, in particular between 0.2 mm and 2.0 mm, and a long thread pitch between 0.1 mm and 5.0 mm, in particular between 0.25 mm and 3.0 mm. As shown inFIG. 3 , thethread 42 ofshaft 38 has a smaller core or root diameter than thenon-threaded portion 44. However, the outer or major diameter of the threadedportion 42 is greater than the diameter of thenon-threaded portion 44. -
FIG. 4 illustrates a side view of an embodiment of abone screw 46 which is a combination of thescrew head 14 having the thread configuration ofbone screw 30 shown inFIG. 2 and ashaft 38 formed as the shaft ofbone screw 36 shown inFIG. 3 . -
FIG. 5 illustrates in schematic form a detailed view of the thread configuration of anexemplary screw head 14 shown inFIGS. 2 and 4 to illustrate certain geometrical features of the bone screw embodiments. In this configuration, thepeaks 28 of thethread 32 have a curved shape and are separated from each other byvalleys 34 having a planar profile in cross section. As shown inFIG. 5 , eachcurved peak 28 forms anarc segment 48. The arc segment can be a segment of a circle (as shown), of an ellipse or of any other curved structure. - The
arc segment 48 is defined by a radius of curvature r and a centre point m. This radius of curvature of the arc segment is between 0.05 mm and 3.0 mm, in particular between 0.1 mm and 1.0 mm. Moreover, eacharc segment 48 has an angular range w which is between 30° and 200°, in particular between 45° and 180°. As illustrated inFIG. 5 , thearc segment 48 is not semicircular (i.e. w<180°) and thepeak 28 of thearc segment 48 is defined by an angle k between a plane p including the core diameter of thethread 32 of thescrew head 14 and a tangent t to thearc segment 48 where it intersects the core. This angle k can be between −10° and 90°, in particular between 0° and 50°. Further, the more stronglyinclined portion 50 of thearc segment 48 can be defined bycurved flanks 50. Eachcurved flank 50 connects thevalley 34 with the top ofpeak 28. It should be noted that theflanks 50 may generally have a different curvature than thearc segments 48 defining thepeaks 28. Moreover, as shown inFIG. 5 , eachcurved peak 28 can be defined by a height h which extends from a plane defined by the core of thescrew head 14 to the top ofpeak 28. This height h of the peak 28 can be between 0.1 mm and 3.0 mm, in particular between 0.15 mm and 1.5 mm. -
FIGS. 6 and 7 show a detailed cross-sectional view ofscrew head 14. Thescrew head 14 as illustrated inFIG. 6 has the thread configuration ofthread 16 according to the screw head shown inFIGS. 1 and 3 , wherein thecurved peaks 28 are provided immediately adjacent to each other on the outer surface ofhead 14.FIG. 7 illustrates the thread configuration ofthread 32 according to the screw head shown inFIGS. 2 and 4 , wherein thecurved peaks 28 are separated from each other byvalleys 34 having a planar profile in cross section. As seen fromFIGS. 6 and 7 , thescrew head 14 tapers toward the screw shaft, and has therefore a conical shape. The conical shape ofscrew head 14 is defined by a cone angle u which is between 10° and 179°. In the present embodiments, the cone angle u is 20° or 30°. - Moreover, the
screw head 14 includes atool holder portion 52 for receiving a tool like a screw driver or the like. Thetool holder portion 52 may be formed by arecess 52 which is arranged within thescrew head 14 and symmetrically to acentral axis 54 of the bone screw. Anopening 56 of therecess 52 is arranged in the top surface of thescrew head 14. In a cross-sectional view in a plane perpendicular to thecentral axis 54 of the bone screw, the profile of thetool holder portion 52 forms a star-shaped pattern with rounded peaks and edges, like a torx socket. Thistool holder socket 52 has a taperingupper portion 58 with an opening angle o. The opening angle o of thisphase 58 of thetool holder socket 52 is between 10° and 179°, in particular 120°. -
FIG. 8 shows a side view of a further embodiment of ascrew head 60 having athread 62 withpeaks 28. Thescrew head 60 has a constant core diameter and thus forms a cylinder. Further, as shown inFIG. 8 , the outer diameter of thethread 62 of thehead 60 gradually tapers. Thus, thethread 62 forms an envelope which has a conical shape defined by an angle α between the outer surface of theenvelope 64 and a plane including the core diameter of thehead 60 and perpendicular to thecentral axis 54 of the bone screw. This angle α can be between 10° and 89°, and is in particular 70° to 85°. Further, an angle β between aplane 66 defined by the core of thehead 60 and the plane perpendicular to thecentral axis 54 of the bone screw is 90°. -
FIG. 9 illustrates a side view of ascrew head 68 having athread 70 withpeaks 28. The difference betweenscrew head 60 shown inFIG. 8 and screwhead 68 shown inFIG. 9 is the fact that the core of thehead 68 has a conical shape defined by an angle γ between thecentral axis 54 of the screw and a plane defined by the conical core of thescrew head 68. This angle γ can be between 1° and 50°, and is approximately 10° in the embodiment ofFIG. 9 . Further, the outer diameter of thethread 70 of thehead 68 gradually tapers and defines theenvelope 64. Theenvelope 64 also tapers towards the shaft of the bone screw, wherein an angle δ is defined between an outer surface ofenvelope 64 and thecentral axis 54 of the bone screw. This angle δ can be between 1° and 50°, and is approximately 20° in the embodiment ofFIG. 9 . -
FIG. 10 illustrates in a cross-sectional view an embodiment of an implant in the form of adummy bone plate 72 that can be adapted as needed (e.g., in terms of shape, thickness, etc.) for use in orthopedic surgery for fixation of bone. Thebone plate 72 has anupper surface 74 and alower surface 76. Further, as shown inFIG. 10 , thebone plate 72 comprises twoholes 78 extending through theupper surface 74 and thelower surface 76 for receiving a bone fastener (e.g., a bone screw as described above and shown inFIGS. 1 to 9 ). Thebone plate 72 has a varying thickness along its entire length. - Each
hole 78 includes an (optional)upper portion 80 and a lower threadedportion 82 configured to mate with the thread of the head of the bone fastener. Theupper portion 80 of eachhole 78 has aninward taper 84 generally having a conical or curved (e.g., spherical) shape. The curved or spherical shape of theinward taper 84 of theupper portion 80 can be defined by an segment of a circle or ellipse in cross section with a center point arranged on a position along acentral axis 86 of thehole 78. - The
lower portion 82 of eachhole 78 tapers toward thelower surface 76 of thebone plate 72. The taper of the threadedportion 82 is defined by a cone angle ε which is between 1° and 179°, in particular between 10° and 120°, and more particularly approximately 20° in the embodiment ofFIG. 10 . As shown inFIG. 10 , the lower threadedportion 82 comprises athread 88 withcurved valleys 90 which are provided immediately adjacent to each other. Further, thethread 88 ofhole 78 is a multiple thread (a double thread). In one implementation, an implant system comprises at least thebone plate 72 with thedouble thread 88 as well as a bone fastening element comprising a head with a single thread (such as any of the bone screws ofFIG. 2 , 4, 7 or 9). -
FIGS. 11 and 11A show another embodiment of an implant in form of adummy bone plate 92 having several plate holes 78 as illustrated inFIG. 10 with ahead portion 94 and ashaft portion 96. As shown in the side view of thebone plate 92 inFIG. 11 , thehead portion 94 has a smaller thickness than theshaft portion 96. Further, as shown inFIG. 11A , thebone plate 92 has several screw holes 78 arranged along the plate and oblique relative to theupper surface 74 of thebone plate 92. Thebone plate 92 can be adapted as needed (e.g., in terms of shape, thickness, etc.) for use in orthopedic surgery for fixation of bone. -
FIG. 12 illustrates a cross-sectional view A-A ofbone plate 92 along the intersection line shown inFIG. 11 . It can be seen fromFIG. 12 that eachhole 78 of the bone plate can have a different angular orientation with respect to thebone plate 92. This angular orientation is defined by thecentral axis 86 of thehole 78 and avertical axis 98 of thebone plate 92. Therefore, as shown inFIG. 12 , thecentral axis 86 of thehole 78 can be oblique relative to thevertical axis 98 of thebone plate 92, wherein angles a, b, c, d, e, f are defined between thecentral axis 86 and thevertical axis 98. These angles can be between 0° and 60°. - An implant system comprising an implant and at least one bone fastener as described above can be used in orthopedic surgery for fixation of bone. The bone fasteners and implants can generally be made of stainless steel, titanium or any other biocompatible material. While the head of the bone fastener includes thread peaks having a rounded shape, the shaft of the bone fastener can be adapted to different applications and may thus be threaded or un-threaded. In the case of a threaded shaft, the thread peaks of the shaft may generally not be rounded. Moreover, in the case a hole of the implant is provided with a thread, this thread may be rounded or non-rounded.
- While the bone plate holes shown herein are circular, they could be elongated and be partially threaded as shown in U.S. Pat. No. 5,709,686 (“the '686 patent”). The threads shown in the '686 patent would be replaced by the curved profile threads described herein.
- The curved peaks of the thread of the head of the bone fastener improve the engagement of the thread in an implant hole. Moreover, tilting and jamming is avoided or at least reduced during the screwing-in operation of the threaded bone fastener head into the implant hole. Thereby, the thread of the bone fastener head and the optionally threaded portion of the implant hole are not damaged (and the patient is not harmed by thread parts which may result from this damage). Further, splinters from the bone drilling as well as further materials like parts of human tissue adhering to the threads have less detrimental effects due to the rounded peaks.
- While the above embodiments have primarily been described in relation to bone screws and bone plates, it will be readily apparent that the techniques presented herein can also be implemented in combination with other types of bone fasteners (such as bone pegs having rod-like or pin-like shafts, wire-like bone fasteners such as Kirschner wires, etc.) as well as other types of implants (such as bone distractors). Accordingly, the present disclosure is not limited to any type of bone fastener or any type of implant.
- The features described in the above description taken in conjunction with the accompanying drawings can be readily combined to result in different embodiments. It will thus be apparent that the disclosure described above may be varied in many ways. Such variations are not to be regarded as a departure from the scope of the disclosure, and all such modifications as would be apparent to one skilled in the art are intended to be included within the scope of the following claims.
Claims (20)
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US12/719,316 US20110218580A1 (en) | 2010-03-08 | 2010-03-08 | Bone fixation system with curved profile threads |
US14/640,630 US9339315B2 (en) | 2010-03-08 | 2015-03-06 | Bone fixation system with curved profile threads |
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US12/719,316 US20110218580A1 (en) | 2010-03-08 | 2010-03-08 | Bone fixation system with curved profile threads |
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US14/640,630 Active US9339315B2 (en) | 2010-03-08 | 2015-03-06 | Bone fixation system with curved profile threads |
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Cited By (50)
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US20110230884A1 (en) * | 2008-06-24 | 2011-09-22 | Adam Mantzaris | Hybrid intramedullary fixation assembly and method of use |
US20120197254A1 (en) * | 2008-06-24 | 2012-08-02 | Scott Wolfe | Intramedullary Fixation Assembly and Method of Use |
US8303589B2 (en) | 2008-06-24 | 2012-11-06 | Extremity Medical Llc | Fixation system, an intramedullary fixation assembly and method of use |
US8328806B2 (en) | 2008-06-24 | 2012-12-11 | Extremity Medical, Llc | Fixation system, an intramedullary fixation assembly and method of use |
US8343199B2 (en) | 2008-06-24 | 2013-01-01 | Extremity Medical, Llc | Intramedullary fixation screw, a fixation system, and method of fixation of the subtalar joint |
US20130289630A1 (en) * | 2012-04-26 | 2013-10-31 | Daniel Duane Fritzinger | Conical-spherical thread form for variable angle locking systems |
US20140066998A1 (en) * | 2012-09-06 | 2014-03-06 | Jean-Jacques Martin | Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) |
US20140236245A1 (en) * | 2013-02-20 | 2014-08-21 | Stryker Trauma Sa | Screw thread with flattened peaks |
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