CA2034014A1 - Method for performing percutaneous diskectomy using a laser - Google Patents

Method for performing percutaneous diskectomy using a laser

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Publication number
CA2034014A1
CA2034014A1 CA002034014A CA2034014A CA2034014A1 CA 2034014 A1 CA2034014 A1 CA 2034014A1 CA 002034014 A CA002034014 A CA 002034014A CA 2034014 A CA2034014 A CA 2034014A CA 2034014 A1 CA2034014 A1 CA 2034014A1
Authority
CA
Canada
Prior art keywords
laser
cannula
introducer
optical guiding
guiding means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002034014A
Other languages
French (fr)
Inventor
Peter S. Hertzmann
Jordan K. Davis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laserscope Inc
Original Assignee
Peter S. Hertzmann
Jordan K. Davis
Laserscope
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/463,759 external-priority patent/US5084043A/en
Application filed by Peter S. Hertzmann, Jordan K. Davis, Laserscope filed Critical Peter S. Hertzmann
Publication of CA2034014A1 publication Critical patent/CA2034014A1/en
Abandoned legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/20Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
    • A61B18/22Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
    • A61B18/24Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor with a catheter
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00238Type of minimally invasive operation
    • A61B2017/00261Discectomy

Abstract

A METHOD FOR PERFORMING
A PERCUTANEOUS DISKECTOMY USING A LASER

Peter S. Hertzmann Jordan K. Davis ABSTRACT OF THE DISCLOSURE
A method for performing percutaneous diskectomy using a laser applies a laser beam from the laser to vaporize nucleus pulposus in the nucleus of the herniated disc.
The wavelength of the laser beam will vary and depend on the laser system used.

Description

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A METHOD FOR PERFORMING
PERCUTANEOUS DISKECTOMY USING A LASER

Peter S. Hertzmann Jordan K. Davis 5 CROSS REFERENCE ;
This patent application is a continuation-in-part of U.S. Patent Application serial number 07/463,759 filed January 12, 1990 which is now pending.
~ , BACKGROUND OF THE INVENTION
10 Field of the Invention This invention relates to a method for vaporizing -nucleus pulposus within a lumbar disc of the vertebral column during a percutaneous diskectomy procedure using a laser.

15 D~SCRIPTION OF THE PRIOR ART
Mechanically assisted percutaneous lumbar diskectomy of the prior art iR used as a treatment of leg pain ~
(sciatica) resulting from herniated discs of the lumbar ~;
vertebral column. The lumbar vertebral column consists of 20 five vertebrae extending superiorly to the transitional thoracic vertebrae ~1) at a first end and extending ~`
inferiorally to the sacrum ~3) at a second end, as illustrated in Figure 1. Between each lumbar vertebrae and between the lumbar and sacrum are cartilaginous discs.
25 Each disc comprises an outer circular structur~ (annulus fibrosus) 2 which surrounds and tightly binds an inner ~`
gelatinous material (nucleus pulposus) 4 in the center, as ~;
illustrated in Figure 2. The annulus fibrosus 2 is made up of concentric fibers which appear to cross each other 30 obliquely. No blood v~ssels or nerves penetrate the nucleus.

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Usually with age, the fibers of the annulus begin to degenerate~ The degeneration results in the tearing of individual ~ibers when the vertebral column is stressed.
Torn fibers can form fenestrations which allow the nucleus 5 pulposus to move through the fibers of the annulus and bulge 5 outward away from the nucleus. If the bulged disc presses upon an adjacent nerve root 6, sciatica may develop, as illustrated in Figure 3A.
It has been demonstrated that removing a portion of 10 the nucleus with grasping forceps through a small cannula will produce good to excellent relief of pain in a majority of patients having symptoms indicative o~
sciatica. Once a portion of the nucleus is removed, the pressure against the nerve root causing the pain is 15 relieved as the remaining nucleus contracts away from the pressure point, as illustrated in Figure 3~. Hijikata S., Yamagishi M., Nakayama T., Oomori K., "Percutaneous Diskectomy: A New Treatment for Lumbar Disc Herniation", J. Toden Hospital 1975; 5:5-13. Since the Hijikata et al.
20 article, mechanical forceps for microlumbar and percutaneous lumbar diskectomy procedures have been developed related to relieving sciatica pain. ~;
U.S. Patent No. 4,369,788, which issued in ~anuary 25, 1983 to Goald teaches one such forceps device having 25 an alligator jaw for microlumbar disc surgery. The forceps can be held by a surgeon in a reversed backhand grip which aids in their manipulation during microlumbar disc surgery procedures. For microlumbar disc surgery, a one-inch incision is made in the patient into which the 30 forceps are inserted and the surgery is performed.
U.S. Patent No. 4,545,374, which issued on October 8, ;
1985 to Jacobson teaches a method and instruments for performing percutaneous diskectomy. The instrumentation ~
taught by Jacobson is illustrated in Figure 4-10 and ~;
35 includes a speculum 20 which has a pair of semi-sharp edged blades 21 for piercing and stretching body tissue P~ I140~1!\1P-002.131~L

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and pivotally hinged handles 22 for opening and closing the blades, as illustrated in Figure 4. Speculum 20 has a guide means for guiding the speculum along a slender member such as a spinal needle (not shown) having a 5 diameter of less than 3 millimeters. The guide means can be any form of a bore or hole through which the spinal needle can pass. Jacobson also teaches a cannula 30, which is illustrated in Figure 5. Cannu:La 30 is a cylindrical tool having a bore 32 for passing instruments lo therethrough from outside the body to inside the body.
Cannula 30 has an oval cross section for allowing different sized and shaped instruments therethrough.
Cannula 30 also has anchor means ~or anchoring the cannula to the disc. Jacobson teaches using a trocar 40 which is 15 inserted into cannula 30, as illustrated in Figures 6 and 7. Trocar 40 has a shaft 41 and a collar 42. Shaft 41 fits into hole 32 of cannula 30 to a point where collar 42 is located. Collar 42 is adjustable, thereby allowing shaft 41 to be adjustably in~erted at different lengths 20 into hole 32. Sha~t 41 o~ trocar 40 is tapered at one end to a point 45 for anchoring into body tissue. A knife 50, as illustrated in Figure 8, having a blade end 53, 54 and a handle 51 at an opposite end to the blade end is insertable through cannula 30. Blade end 53, 54 is curved 25 to allow quick and more efficient fragmentation of disc nucleus pulposus because it undergoes a curved cutting path during use. Rongeur forceps 60 for removing fragmented disc nucleus material are inserted into the cannula after knife 50 is removed. Rongeur forceps 60 30 have scissor-like handles 61, 62 pivotally connected near one end by pivot 63 and a jaw 68, 69, wherein spreading the handles 61, 62 opens the jaw 68, 69 and squeezing the handles 61, 62 closes the jaw 68, 69, as illustrated in Figure 9.
The percutaneous lumbar diskectomy procedure taught by Jacobson includes placing a patient in a lateral P:\M\1 140\P\!P-002.1~L
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decubitus position on an operating table; anesthetizing the patient usually with a long spinal needle which is guided into the disc area with the aid of fluoroscopic x-ray, and incising a 1 centimeter long skin incision to 5 create a percutaneous channel 9 with a speculum 20, as illustrated in Figure 10. Speculum 20 is constructed to open and close and ha~ jaw blades with semi sharp edges which spread rather than cut body tissue. Speculum 20 is guided by guide means over the spinal needle until lO properly located. The jaws of speculum 20 are spread open to create channel 9 for the insertion of cannula 30 to act as a conduit for the insertion of tools. Cannula 30 is inserted with the aid of a trocar 40 and speculum 20 is removed. Trocar 40 adds stiffness to the flexible cannula 15 and eases its insertion along with the guidance of fluoroscopic x-ray. Trocar 40 can have pointed tip 45 which sticks into the disc capsule 8 and prevents lateral ;~
movement of cannula 30. A nerve stimulator (not shown) is passed down channel 9 with cannula 30 or trocar 40. The 20 stimulator will cause motion in one of the patient's legs if it makes nerve contact, thereby ~ignaling the surgeon that a slightly different insertion position is necessary. -;~
A hole is cut in the annulus fibrosus surrounding the nucleus with knife 50 or another trocar having a rotatable 25 reamer; the nucleu3 pulposus is fragmented with knife 50, ultrasonics, laser or dissolving chemicals; and fragments of nucleus pulposus are removed with Rongeur forceps 60 and/or suction. Rongeur forceps 60 preferably have large angle~ jaws which sweep a wide arc and several Rongeur `~
30 forceps may be used each with ~lightly different angled jaws to remove nucleus pulposus ~rom different portions of the disc. The surgeon uses rotational motion about an axis defined by the shaft of the forceps in order to scoop out material about an axis of revolution. A Z-head 35 Rongeur forceps can create a cavity of revolution by removing a large amount of nucleus material upon rotation.

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The cavity created in the nucleus pulposus is flushed with saline solution to clean out the space; the solution and any debris contained therein are suctioned out; the cannula is removed and the fat and fascia underneath the 5 skin is stitched up. The outer skin surEace is bandaged with an adhesive strip to prevent suture ~scars.
Jacobson taught that this procedure requires one to two days recovery time, that outpatient convalescence is possible and that the total procedure time is 10 approximately 15 minutes. Nevertheless, the instrumentation and procedure require extensive manipulation of tools by the surgeon, that a more streamlined procedure using fewer tools would be desirable. In practice, the Jacobson procedure has a 60%
15 failure rate in relieving back pain and takes greater than 15 minutes to per~orm.
U.S. Patent No. 4,678,459 issued to Onik et al. on July 7, 1987 teaches using an irrigating, cutting and aspirating system for percutaneous surgery. Onik et 20 disclose using a system for removing nucleus pulposus tissue 79 which includes a probe and a guillotine type of ;
~utting means 78 for cutting the nucleus pulposus 79, as illustrated in Figure 11. The severed or cut fragments of nucleus pulposus 79 are removed from the cutting means 78 25 using an internal fluid irrigation system and a vacuum to aspirate the severed fragment~ out of the disc area, through the system, and out of the patient. This system provides for a relatively fast diskectomy procedure - compared to the other prior art because nucleus pulposus ~
30 can be fragmented and removed without the need to ~ -manipulate many small blades, knives and forceps, a~
described for the Jacobson patent 4,545,374. The probe and guillotine-type cutting means taught by Onik et al. is ~;
sold on the market as a Nucleotome Probe 70, as 35 illustrated in Fig. 15. ~his instrument is the most widely used instrument for percutaneous diskectomy. The P:\M\1140~lp 002,PPI

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procedure and instrumentation used to implement the Nucleotome Probe 70 include placement of a FlexTrocar 71 into a 3 millimeter skin incision made on the side of the patient's body where the herniation is evident. The 5 FlexTrocar 71 is inserted until it contacts the annulus fibrosus 72 of the herniated disc, as illustrated in Figure 12, using the guidance of a fluorolscopic X-ray.
Once the FlexTrocar 71 is in place, a straight cannula 73 having a tapered dilator 74 is passed over the FlexTrocar 10 71 and inserted down to the annulus 72 wall, as illustrated in Figure 13. The position of the straight cannula 73 is confirmed fluoroscopically. once the cannula 73 is in place, the tapered dilator 74 is removed ;~
from the cannula 73. A trephine 75 is inserted through 15 the cannula 73 and over the FlexTrocar 71. The trephine 75 is rotated in a clockwise motion with slight pressure to incise the annulus, as illustrated in Figure 14. The `
trephine 75 and the FlexTrocar 71 are subsequently removed ;
from the patient's body. The Nucleotome Probe 70 is 20 inserted into the aannula 73 after the trephine 75 and FlexTrocar 71 are removed. The Nucleotome Probe 70 locks into place on the cannula 73, as illustrated in Figure 15.
When the Nucleotome Probe 70 is activated, the nucleus pulposus is cut into fragments which are removed with 25 irrigation fluids and suction, all within the Nucleotome Probe 70. The Nucleotome Probe 70 is activated until no further material can be extracted. Once complete, the Nucleotome Probe 70 and cannula 73 are removed and the entry point i5 covered with a sterile bandage. The 30 cutting and extracting process alone using the Nucleotome Probe 70 normally takes between 20 to 30 minutes.
In 1989, P.W. Ascher, D.S. Choy and H. Yuri suggested using lasers to vaporize disc material in a percutaneous diskectomy procedure. Ascher et al. believed the C2 laser 35 was not a viable chaice for percutaneous diskectomy because an optical fiber for the CO2 laser was not yet P:\M\1140\P\1P~2.8~

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available. Ascher et al. reported using an Nd:YAG laser at 1060 nm since an optical fiber was available. Ascher et al. were aware that the Nd:YAG laser at 1060 nm had low adsorption in water and white tissue and high absorptivity 5 in water and white tissue is necessary to produce effective vaporization of nucleus pu:Lposus. Tests were performed with less than encouraging results. Also, Ascher et al. reported using a Nd:YAG lasler at 1320 nm and claimed it produced twice as much volume reduction as 10 compared to the 1060 nm laser. Neverthel,ess, Ascher et al. reported that only the C02 laser or the Er:YAG laser would produce sufficient results in a~out 10-15% of patients having the requisite symptoms. Abstract No. 202, p. 48, entitled "Percutaneous Nucleus Pulposus 15 Denaturization and Vaporization of Protruded Discs", American Society for Laser Medicine and Surgery: Lasers in Surgery and Medicine, Supplement 1, 1989.
The results of the Ascher et al. investigations did not produce safe and effective results using a laser to 20 vaporize nucleus pulposus from herniated discs. It would be desirable if a laser technique and laser instrumentation were available to perform percutaneous diskectomies so that nucleus pulposus from herniated discs could be vaporized using a laser in a safe and effective 25 way which is faster than cutting and irrigating using the Nucleotome Probe and which would eliminate the need to cut and remove fragmented debris from the patient.

SUMMARY OF THE INVENTION
~herefore it is an object of the present invention to 30 provide a method for performing percutaneous diskectomy using a laser in a safe and effective manner.
According to the object of the present invention a method for performing percutaneous diskectomy using a laser comprises applying a laser beam from the laser to a 35 herniated disc area, the laser beam having a wavelength in P:\M\1140~1P-002.~eL

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the range of 350 through lOOOnm. The wavelength of the laser beam applied to the herniated disc according to the present invention will vary and depend on the laser system used.
A safe manner of performing a percut;~neous diskectomy using a laser is defined as using a laser system which vaporizes the target material with minimal thermal damage to adjacent structures. An effective manner of performing a percutaneous diskectomy using a laser is defined as 10 using a laser system which sufficiently vaporizes the target material to relieve the pain at least caused by sciatica.

BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a posterior view of the lumbar vertebral 15 column.
Figure 2 is an oblique view of a lumbar disc and in~erior vertebrae.
Figure 3A is a sectional view of a herniated lumbar vertebrae and an associated nerve root.
Figure 3B i5 a sectional view of the vertebrae in Figure 3A after nucleus pulposus is removed.
Figure 4 is a side view of a prior art speculum.
Figure 5 is a oblique view of a prior art cannula.
Figure 6 is a side view of a probe of the prior art.
Figure 7 is a side view of the probe in Figure 6 inserted into the cannula of Figure 5.
Figure 8 is a side view of a knife of the prior art.
Figure 9 is a side view of a prior art Rongeur forceps.
Figure 10 is a sectional view of a channel created by the prior art speculum in Figure 4.
Figure 11 is an enlarged sectional view of the Nucleotome Probe of the prior art.
Figure 12 is an obligue view illustrating FlexTrocar 35 of the prior art entering the disc area. ;-~

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, g Figure 13 is an oblique view illustrating straight cannula and tapered dilator of the prior art.
Figure 14 is an oblique view illustrating the trephine of the prior art.
Figure 15 i5 an oblique view illustr,ating the Nucleotome Probe of the prior art.
Figure 16 is a posterior view of a patient in a lateral decubitus position.
Figure 17 is a side view illustrating a probe used lo with the present invention. ~-Figure 18 is an oblique view illustrating the probe ~, inserted into a disc according to the present invention. ~
Figure 19 is a sectional view of a herniated disc and ~;-associated nerve root having the probe inserted thereinto 15 according to the present invention.
Figure 20 i5 a side view of a cannula having a dilator inserted thereinto used with the present invention.
Figures 21A-21E are sectional and plan views of a 20 bayonet type lock fitting used with the present invention.
Figure 22 is a side view illustrating a curved cannula used with the present invention.
Figure 23 is a side view illustrating an introducer means according to the present invention.
Figure 24 is a side view illustrating a stylet used ~;
with the present invention.
Figure 25A-H are sectional views illustrating a clamping mean~ according to the present invention.
Figure 26 is a side view illustrating an introducer 30 means having a formed end according to the present invention.
Figure 27 is an enlarged sectional view illustrating an optical guiding means emanating from the formed end of introducer means according to the present invention.
Figure 28 is a side view of an irrigation/aspiration cannula used with the present invention.

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-- 10 -- . ,, Figures 29A-C are sectional views illustrating a position indicator means according to the present invention.
Figures 30A,B are plan views illustrating the first 5 line of a laser beam. '!, ' ', Figures 31A-C are plan views illustrclting the second lina of a laser beam.

DETAILED DESCRIPTION OF THE INVENTIO~
A percutaneous diskectomy procedure using a laser is 10 designed for patients commonly showing ev:idence clinically and radiologically of nerve root impingement.
Conventionally, physical examination of the patient should reveal leg pain greater than back pain and signs of nerve root irritation consistent with a herniated disc.
15 Radiographically, the patient should exhibit a focal herniation or bulge that shows an impression on the thecal -~
sac which does not occupy more than fifty percent of the thecal sac. Also, the radiographic results should correlate with the patient' 8 symptomatology.
Vaporization of nucleus pulposus material according to the present invention suggests that the operative tools be inserted at an entry site on the same side of the patient's body that the herniation or other affliction is evident. The path of entry to the afflicted ~isc should 25 avoid going through the psoas muscle since the lumbar ~;
plexus has numerous fibers which traverse the muscle. ;
Conventionally, a computed tomograph (CT) scan slice of the whole abdomen through the involved disc is quite helpful for determining the entry path. ~
The safety of the procedure relies on radiologic ~ `
localiæation and guidance of the instruments into the disc and a C-arm fluoroscope with image intensification, known in the art, can provide clear and sharp images in antero-posterior, lateral and oblique views.
Typically, the patient undergoing a percutaneous --P~ 1140U~1P-aO2.1~8L

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diskectomy procedure is positioned on a fluoroscopic ~`
table, which is known in the art, in a lateral decubitus position, as illustrated in Figure 16. The patient must be stabilized to prevent rotation of the patient's 5 shoulders and hips during the procedure. Using a fluoroscope, the sacrum is identified and located, the afflicted disc is located, and as illustrated in Figure 16, a posterolateral entry point is selected. The entry point typically is 8-12 centimeters from the midline and lo both parallel and midway between the end plates of the afflicted disc, as determined using a measuring scaleD
hocal anesthetic is used to anesthetize the area to be operated on which is administered typically with a long ~;
spinal needle.
At this point in the patient preparation procedure, the percutaneous diskectomy procedure using a laser and means for inserting instrumentation according to the present invention is described.
First, one end of a semi-r.igid trocar or probe 100, 20 which i9 preferably 18 gauge Birmingham Wire Gauge (BWG), is inserted at the entry point once the anesthetic has taken effect. Probe 100 has an elongated body lOOa and has a standard tube clamp lOOb with a threaded lock lOOc connected to probe 100, as illustrated in Figure 17.
Clamp lOOb is removable from body lOOa by loosening ~-lock lOOc and sliding clamp lOOb in either direction beyond the end of probe 100. Clamp lOOb serves as a handle to hold probe 100 while it is inserted into the patient. Clamp lOOb is removed for subsequent steps 30 described below. Clamp lOOb may be made o~ plastic, for example acrylonitrile-butadiene-styrene (ABS) plastic or preferably polycarbonate plastic, or metal, preferably stainless steel.
Probe 100 is preferably made of stainless steel also, 35 for example type 304 or an equivalent, No. 3 temper. The inserted end of probe 100 has a sharp tip and is guided .

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into the damaged or herniated disc area 18c with radiologic localization and guidance, preferably using the c-arm fluoroscope with image intensification, as described above. Probe 100 is inserted until the inserted end 5 punctures through the annulus ~ibrosus 18a of the disc 18b, as illustrated in Figures 18 and 19. While probe 100 is in place, extending ~rom the disc area to outside the patient's body, a cannula 104 having a di]ator 102 inserted thereinto is inserted over probe 100 at the 10 exterior end and into the probed disc area 18c. One end of dilator 102 (102b) and cannula 104 (104b) remain on the exterior of the patient.
Cannula 104 and dilator 102 are preferably 12 gauge stainless steel tubing, for example type 304, No. 3 temper 15 (full hard). Stainless steel tubing may be purchased at any stainless steel tubing supplier, for example Poper and Sons, N.Y. Dilator 102 preferably is longer than cannula 104 and has a tapered end 102a which extends beyond the end 104a of cannula 104, as illustrated in Figure 20, for 20 ease of insertion over probe 100 through the patient's skin. Dilator 102 has bore 102d which extends through the center of dilator 102 along its length. Probe 100 fits within bore 102d of dilator 102. Cannula 104 is preferably a straight tubular member having a central bore 25 104d, which extends along its length. Dilator 102 and probe 100 ~it within bore 104d of cannula 104.
Cannula 104 and dilator 102 have locking means 103 (103 mechanism not shown in Figure 20) for locking dilator 102 to cannula 104 at end 104b and 102b, respecti~ely, and 30 a locking stabilizer 105, as illustrated in Pigure 20.
Locking means 103 is preferably a bayonet-fitting locking mechanism, as illustrated in Figure 21A-21F as portions 103a and 103b. Dilator 102 has portion 103a and cannula 104 has portion 103b of bayonet-fitting locking mechanism -35 103. Portion 103b on cannula 104 has a segmented body and flared legs for gripping and preferably projection 103b-1 P:\M\1140\P\IP-002.1~13L

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having two laterally extending flanges 103b-2 which oppose one another. Portion 103a on dilator 102 preferably has aperture 103a-1 and sockets 103a-2. Aperture 103a 1 is at least as deep as the distance projection 103b-l projects.
5 Sockets 103a-2 oppositely extend off aperture 103a-1 and are at least as deep as flanges 103b-2 are thick.
Projection 103b-1 and flanges 103b-2 fit within aperture 103a-l and sockets 103a-2, respectively. Once fitted together, end 102b of dilator 102 is turned clockwise 10 thereby rotating dilator 102 within cannula 104 to lock locking portion 103a to locking portion 103b and thereby lock dilator 102 to cannula 104 using locking means 103. ~q Locking means 103 can also be a luer lock, threaded screw lock, snap lock or a friction fitted lock, which are known 15 in the art. Locking mean~ 103 and stabilizer 105 can be made of plastic, ABS or preferably polycarbonate plastic, or metal, preferably stainless steel. In the preferred embodiment, means 103 and stabilizer 105 are made of a plastic which can withstand at least the stresses 20 associated with gamma sterilization techniques without distortion. The plastic may also withstand the stresses associated with autoclaving and usage of ethylene oxide gas sterilization methods. Locking stabilizer 105 is adjustably located along the length of cannula 104 and 25 serves to rest against the patient's skin when the cannula is properly placed.
In another embodiment, curved cannula 106 may be inserted into the patient instead of straight cannula 104.
Cannula 106 is a curved tubular member having a locking 30 dilator 107 and locking stabilizer 108, as illustrated in Figure 22. Curved cannula 106 is used in situations where the patient's afflicted area is within the lumbar 5-sacrum ~ ;
1 region of the vertebral column, as shown in Figure 1.
once dilator 102 and cannula 104 are confirmed, 35 preferably fluoroscopically, to be embedded in the annulus fibrosus, dilator 102 is unlocked from locking mechanism P:\M\1140\P\11'-002.1~eL

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103 and removed. Dilator 102 is unlocked by turning portion 103a counterclockwise while holding portion 103b on cannula 104 stationary. As dilator 102 is withdrawn, cannula 104 is advanced forward to embed in the wall of 5 the annulus approximately the distance equal to the difference in length of dilator 102 and c,annula 104.
Cannula 104 is secured by stabilizer 105 ~y unlocking the screw mechanism, sliding stabilizer 105 up against the patient's skin, and locking the screw. Probe 100 is 10 removed once cannula 104 i5 secured.
Second, one end of a first introducer means or tube 110 for inserting instrumentation according to this -invention is inserted into central bore 104d at the exterior end 104b of cannula 104. First introducer mean~
15 110 is a substantially straight elongated member preferably 14 gauge along most of its length and having a ~
17 gauge tip llOa at one end, as illustrated in Figure 23, ~ ;
and a clamping means 111 at an opposite end for clamping to an optical guiding means, as i9 described below. First 20 introducer mean~ 110 i5 metal, preferably type 304 stainless steel, No. 3 temper (full hard). Clamping means 111 can be plastic, preferably polycarbonate plastic or metal, preferably stainless steel. First introducer means 110 has a bore llOd which extends through the center of 25 first introducer means 110 along its length. When the one end llOa of first introducer means 110 is inserted ~;
into bore 104d of cannula 104, first introducer means 110 preferably has a stylet 112 extending therethrough. ;
Stylet 112 i9 a long straight member, preferably 18 gauge 30 stainless steel, having a sharp tip 112a at one end and a handle means 112b for handling stylet 112 at the opposite end, as illustrated in Figure 24. The sharp end 112a can be a conical-shaped tip, diamond shaped tip or beveled, for example. Sharp end 112a extends out of the inserted ;~
35 end llOa of the first introducer means and stylet 112 locks into clamping means 111 on first introducer means P:\hl\1140U'\lP-002.E~L , :~' .. : . ~ -: . :. '~ ;, ', :' . ' . :. . ' ~: . ,. ,, ; :

~ ~ 3 4~0":~L 4 ,, 110 at handle means end 112b. The locking mechanism for clamping means 111 will be described below. Stylet 112 i5 longer than and narrower in diameter than first introducer means 110 and fits within bore llOd of first introducer 5 means 110. The clamping means 111 can also lock with handle means 112b either with a luer lock, threaded screw lock, snap lock, friction fit lock, but clamping means 111 is preferred.
Because the sharp tip extends out of the inserted end 10 llOa of first introducer means 110, stylet 112 contacts the outer wall of the nucleus 18d and enters into the nucleus with its sharp tip 112a, leaving a small openingO
Since the nucleus is a soft gelatinous material, stylet `
112 enters the nucleus with minimal resistance and the 15 inserted end llOa of first introducer means 110 is placed in the nucleus. Stylet 112 is removed from the nucleus through the first introducsr means 110, and the first introducer means or tube 110 is left in place for introducing instrumentation into the nucleus. ~ ~
Third, one end of a first optical guiding means 116 - `
for guiding laser light is inserted through bore llOd of ~ `
first introducer means 110 after stylet ~12 is removed.
First optical guiding means 116 is inserted until it emanates from end llOa of first introducer means into the `
25 small opening made by stylet 112.
First optical guiding means 116 is preferably an optical fiber or a hollow optical wave guide, depending on the embodiment. In a first embodiment, an optical fiber is used which is preferably 400 micrometers in inner 30 diameter and 600 micrometers in outer diameter and is made of quartz. In the second embodiment, a hollow optical ~`
wave guide is used which can be made from metal or ceramic and is preferably made of ceramic. The hollow waveguide i5 rigid compared to the optical fiber.
First optical guiding means 116 comprising either the optical fiber of the first embodiment or ~he hollow P~ 1140\P\IP-002.BEL ~

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203401~

- 16 ~
optical waveguide of the second embodiment passes through first introducer means 110 and into the nucleus 18d at a first end and is connected to a first laser means for producing laser light at a second end outside of the 5 patient. First optical guiding means 116 preferably has a position indicator means lllh for indicating a preset distance optical guiding means 116 must extend out of first introducer means llo at end llOa. Position indicator means lllh, which is described below, is ;
lO illustrated in Figures 29A-C and serves to prevent optical guiding means 116 from being inserted beyond the preset distance by contacting clamping means 111 from one end.
Clamping means 111 then locks optical guiding means 116 in place in first introducer means llo. Clamping 15 means lll serves to ensure that optical guiding means 116 moves with first introducer means 110 as first introducer means llO is manipulated during the diskectomy procedure according to the preferred embodiment.
As illustrated in Figure 25A, clamping means 111 has 20 a clamping end llla, midsection lllb and an introducer end lllc. Midsection lllb and introducer end lllc preferably comprise clamp housing lllg. Clamping means 111 can be made of a metal, for example stainless steel, but is preferably made of molded plastic, preferably 25 polycarbonate plastic.
Clamping end llla comprises a clamp llla-l having a clamping head llla-2, two integrally connected compression legs llla-3, and side members llla-7, as illustrated in Figures 25A-C. Side members llla-7 are wider than 30 compression legs llla-3. Clamping head llla-2, side members llla-7, and compression legs llla-3 are preferably molded as one piece. Legs llla-3 and side members llla-7 are integrally connected to head llla-2 at one end while the opposite ends are free.
Compression legs llla-3 and side members llla-7 of clamp llla-l fit within midsection lllb of housing lllg, P~ 1140\P~1P-002.E13L .

.

,, : , . . :

- ~340~ ~

and each compression leg llla-3 has a cylindrical boss llla-4 which projects laterally therefrom, as illustrated in Figures 25A-F. Bosses llla-4 fit with:in internal curved recesses lllb-1 of midsection lllb a~ illustrated 5 in Figure 25G when clamp llla 1 is fully :inserted into housing lllg. Curved recesses lllb-1 serve as cam sur~aces while the cylindrical bosses llla~4 serve as cam followers. compression legs llla-3 also each have an engagement ear llla-5 at the free ends thereof. Engagement 10 ears llla-5 project laterally out and fit within retention slots lllb-2 in outer housing lllg, as illustrated in Figures 25A-F and H. Retention slots lllb-2 are located in midsection lllb near where midsection lllb and introducer end lllc meet. As clamp llla-1 is inserted 15 into housing lllg, bosses llla-4 slide along recesses lllb-l until engagement ears llla-5 snap into retention slots lllb-2, thereby fixing the assembly together, as illustrated in Figure 25A. Then housing lllg is rotated while clamping end llla is held stationary, causing 20 midsection lllb to press in on compression legs llla-3 with cam and ~ollower action. Engagement ears llla-5 also move out of retention slots lllb-2 and within midsection lllb as midsection lllb is rotated.
An alastomer llld is retained by the inner radius of 25 compression legs llla-3 and side members llla-7 and is preferably tubular in shape, extending from head llla-2 to engagement ears llla-5, as illustrated in Figure 25A.
Elastomer llld is a resilient material, preferably silicone rubber. Elastomer llld grips or clamps to 30 optical guiding means 116 when housing lllg is rotated.
Optical guiding means 116 is inserted into first introducer means 110 through bore 110d to a position indicated by its position indicator means lllh, as illustrated in Figures 29A-C. Optical guiding means 116 35 is intended to extend out of end llOa for a distance which is determined by the surgeon to be within the nucleus 18d P:\M\1140\P\1P-002,~EL ~

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2~3~

of the a~flicted disc 18b. Compression legs llla-3 compress elastomer llld against optical guiding means 116 in the fully rotated, locked position. The side members llla-7 prevent radial expansion o~ the elastomer llld 5 during the compression. Elastomer llld grips and prevents axial slippage of optical guiding means 116. The compressed elastomer llld distributes the clamping force on the optical guiding means in such a manner that the optical transmission characteristics of optical guiding 10 means 116 are not degraded. In addition, elastomer llld exhibits a large coe~ficient of friction against optical guiding means 116. This large coefficient of friction minimizes the clamping force required to sustain a given degree of restraining force. Because of the 15 characteristics of elastomer llld, clamping means 111 is also removable by rotating housing lllg in the opposite direction to release the compression forces without degrading the optical guiding means 116 optical ;
characteristics.
Both clamping means lll and position indicator means lllh clamp and grip onto optical guiding means 116 in the same way and clamping means 111 also clamps to stylet 112 in the same fashion. The shapes of housing lllg and position indicator means (lllh) housing lllh-1 differ 25 although they comprise similar components. The ;
differences in housing lllg and the housing lllh-1 of position indicator means lllh relate to introducer end lllc. Introducer end lllc is shaped to fit and grip end 110b of first introducer means 110. End 110b is flared as ~ -30 illustrated in Figure 25A ancl flare grip lllc-l holds end llOb in place. In the preferred embodiment, flared end llOb is bonded into introducer end lllc using an organic adhesive, for example fast bonding adhesives which are compatible with both plastics and metal, like 35 cyanoacrylate adhesives. On the other hand, position indicator means lllh is shaped to facilitate the insertion P:~l 140\P\1P-002.aeL ~ ~

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of the optical guiding means 116, which does not have flared ends, as illustrated in Figures 29A-C.
Clamping means 111 is assembled as follows: First, end llOa of first introducer means 110 is inserted into 5 housing lllg from midsection lllb end until flared end llOb contacts with flared grip lllc-1. End llOb of first introducer means 110 is held in place until bonded with a pre-applied adhesive. Second, elastomer llld is then inserted within the inner radius of compression legs 10 llla-3. Third, clamp llla-1 is inserted into midsection lllb until engagement ears llla-5 engage with retention slots lllb-2. Housing lllg is not rotated into the clamping position until optical guiding means 116 or stylet 112 is inserted and clamping is necessary. ;~
Fourth, using laser energy from the first laser means ~-through first optical guiding means 116, some of the nucleus pulposus within nucleus 18d is vaporized to create a first vaporized area in the nucleus 18d of the herniated disc 18b. The first vaporized area provides a space or 20 cavity in the nucleus pulposus into which nucleus pulposus from the herniated area 18c can fill and thereby contract away from nerve root 18e. First optical guiding means 116 along with first introducer means 110 are removed from cannula 104 when the vaporization step is complete.
According to the invention, a second vaporization step is included. According to the preferred embodiment, a second introducer means 130 is inserted into cannula 104 to contact the first vaporized area.
Second introducer means 130 is preferably 14 gauge 30 along its length and has a 17 gauge tip 13Oa. Second introducer means 130 is metal, preferably type 304 stainless steel, No. 3 temper (full hard~. Moreover, the ~ -opening in tip 130a of second introducer means 130 is formed differently from first introducer means 110, as 35 illustrated in Figure 26 and in an enlarged view illustrated in Figure 27. Rather than opening 130a-1 P~ 1140\P\lP-002.aeL ~

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203~0~4 being perpendicular to the longitudinal axis of the tubular member as is shown for first introducer means, opening 130a-1 at end 130a is curved relative to the longitudinal axis. Curved end 130a is not ~lared out nor 5 wider than the 14 gauge portion of the tubular member. As a result, curved end 130a of second introducer means 130 need not be wider in diameter than first introducer means 110. In the preferred embodiment, second introducer means 130 is the same inner and outer diameter as first 10 introducer means 110 and has a curvature at end 130a within that outer diameter. There~ore, second introducer means 130 fit~ within cannula 104 in the same way first introducer means 110 fits within cannula 104. Cannula 104 remains in the patient's body to receive second introducer 15 means 130 for the second vaporization step according to the preferred embodiment, as described below.
Fifth, the curved end 130a of second introducer means 130 enters the nucleus 18d and contacts the first vaporized area when second introducer means 130 is 20 inserted into cannula 104. One end of a second optical guiding means 132 is inserted through a central bore }30d, of second introducer means $30 to emanate from opening 130a-1 into the first vaporized area at the formed end 130a of second introducer means 130, as illustrated in the 25 enlarged view in Figure 27. Second optical guiding means 132 has a position indicator means which is the same as position indicator means lllh on first optical guiding means 116. The position indicator means on second optical guiding means 132 contacts with clamping means 131 in the 30 same way as described above for first introducer means 110 and position indicator means lllh. Clamping means 131 and 111 are essentially the same and clamping means 131 is illustrated in Figure 26.
When end 132a of second optical guiding means 132 35 emanates from opening 130a-1 o~ curved end 130a on second introducer means 132, end 132a of second optical guiding }':~tl40~1p 002,PPI

2~34~4 means 132 is deflected off the longitudinal axis of the second optical guiding means 132. The amount which second optical guiding means 132 is deflected is dependent upon the radius of curvature of end 130a of second introducer 5 means 130.
The considerations made when det~rmining what radius of curvature to use at least depended on several factors, according to the invention. First, the minimum radius o~
curvature should be so formed at the tip o~ an introducer `
10 means so that the curved introducer means still fits within cannula 104. Second, optical guiding means 116 or 132, for example an optical fiber, should deflect with uniform curvature to achieve a minimal loss of laser light guiding efficiency. Third, the radius of curvature of the 15 introducer means allowable and the diameter of the optical guiding means allowable are mutually dependent. According to the preferred embodiment, the radius o~ curvature is 0.45 which de~lects second optical gulding means 132 about 17 from the longitudinal axis when second optical guiding 20 means 132 is a 400um optical fiber. Second optical guiding means 132 can be deflected between the range of 1 to 30 by curved end 130a of second introducer means 130r for the preferred embodiment. ~`
Once second optical guiding means 132 is in place and 25 positioned so that it extends out of curved end 130a of second introducer means 130 for a distance, as predetermined by the surgeon, optical guiding means 132 is locked in place by clamping means 131 in much the same way as de~cribed previously for clamping means 111.
30 Therefore, clamping of second optical guiding means 132 to second introducer means 130 allows second optical guiding means to be manipulated as second introducer means 130 is manipulated. An end of second optical guiding means 132 ~`~
opposite to the deflected end is attached to a second 35 laser means. Light energy from the second laser means is i guided by second optical guiding means 132 into the 1140\P~IP-002.BBL

... ::. .. , : . ,. - -,. ; , ... . . .

203~

nucleus 18d to vaporize nucleus pulposus and create a second vaporized area within nucleus 18d. The second ;-~
vaporized area of the preferred embodiment is larger than the first vaporized area and the larger area is created by 5 the deflected beam emanating from deflectled end 132a of second optical guiding means 132 during this vaporization step. Manipulation of second introducer means 130 with second optical guiding means 132 clamped thereto will cause manipulation of the deflected beam as well. ~:
According to the invention, when the laser beam is applied generally along a line 30-1 to a herniated disc ~
area, the line or path that the laser beam takes is : .:
illustrated by example in Figure 30A. Line 30-1 is ``~
obtained by moving first introducer means 110 having first .~
15 optical guiding means 116 disposed therethrough axially :~:
within cannula 104. Since laser beams according to the ~ -invention are divergent and emanate in a 15~ cone from the :
guiding means, the line or path defined by the divergent beam i8 described as a single overall direction the laser 20 beam travels, as illustrated by arrow A in Figure 30A.
Line 30-2 to a herniated disc area can also be the path of the laser beam, as illustrated in Figure 30B. Line 30-2 to a herniated disc area is obtained with second introducer means 130 having second optical guiding means ~ -25 132 disposed therethrough, being deflected off the longitudinal axis by curved end 130a. The laser beam guided through deflected second optical guiding means 132 :
is applied along line 30-2. :.
The laser beam can be applied along a line 31-1, as 30 illustrated in Figure 31A. Line 31-1 is different from line 30-1, as illustrated in Figures 30A and 31A, and the difference is at least due to shape of straight first ::
introducer means 110 relative to the shape of curved second introducer means 130. Line 31-1 is obtained by 35 guiding a laser bea~ along second optical guiding means 132 while second optical guiding means 132 is disposed in P:\M\1140~P\1P 002,E~BL
~' .

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- 23 - ~;
curved second introducer means 130.
When the laser beam is applied along line 31-2, line 31-2 is differènt ~rom line 30-l and line 30-2, a9 illustrated in Figures 31A and 31B. Line 31-2 is obtained 5 by guiding a laser beam along second optical guiding means 132 while second optical guiding means is disposed in curved second introducer means 130. Moreover, curved end ;~
130a of second introducer means 130 is inserted into cannula 104 at a position rotated a distance from line lO 30-2. Line 31-2 is at an angle to both line 30-1 and line 30-2.
When the laser beam is applied along a line 31-3, line 31-3 is different from line 30-1 and line 30-2, as illustrated in Figure 31C. Line 31-3 is at an angle to 15 line 30-1 and parallel to line 30-2. Line 31-3 is obtained by guiding a laser beam along second optical guiding means 132 while second optical guiding means 132 is disposed in curved second introducer means 130 and second introducer means 130 is moved axially a distance 20 within cannula 104 along the path followed by second introducer means 130 for line 30-2.
According to the preferred embodiment, second introducer means 130 having curved tip 13Oa can be moved axially within cannula 104 while the laser beam applied to 25 the nucleus from deflected end 132a of second optical guiding means is at an angle to the direction of movement.
Moreover, second introducer means 130 having second optical guiding means 132 disposed therethrough can be rotated to any distance through 360 degrees to apply the 30 laser beam in an arc up to 360 degrees. The laser beam from second introducer means 130 can be applied along a plurality of lines through 360 degrees or less and each line would be at an angle to the previous line. Second introducer means 130 can be moved axially within cannula 35 104 while being rotated through 360 degrees at least one time and preferably several times during the second " :
P:\M\1140\P\IP-002.EEL

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203~014 vaporization step. The deflected beam from second optical guiding means 132 and the movement increase the amount of nucleus pulposus vaporized in the second vaporized area.
Second introducer means 130 having curved end 130a 5 articulates second optical guiding means l32 to increase the amount of nucleus pulposus which can be vaporized.
Second introducer means 130 articulates tl~e second optical guiding means 132 in a static way because second introducer means 130 has one predetermined curved end 130a lO which will deflect second optical guiding means 132 in one way and to only one degree. Different optical guiding means having different radii of curvature can be used in addition to second introducer means 13~ and still he within the scope of the invention.
on the other hand, variable articulators are known in the art which articulate optical fibers in numerous ways and to different degrees in endoscopic procedures.
Variable or dynamic articulators of the relevant art are much larger in diameter and require much larger paths in 20 which they are manipulated. As a result, variable articulators are used in endoscopic surgery through preexisting body cavities. Second introducer means 130 is a static articulator which can be manipulated within much smaller paths than the variable articulators because of 25 second introducer means 130 design and construction.
Therefore, static articulator or second introducer means 130 of the present invention works well in percutaneous procedures while variable articulators do not. Also, second introducer means 130 can vaporize a larger given 30 area than straight first introducer means 110 when each is manipulated along the same small path or cannula 104, as described above.
Second optical guiding means 132 can be of the same construction as first optical guiding means 116 or can be ~-35 different. In the preferred embodiment, second optical guiding means 132 is the same construction as the first P:\bl\1140\P\lP~2.ElL ,"

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- 25 - 203~0~4 optical guiding means, and in particular, can be the same optical guiding means used for optical guiding means 116.
In the first embodiment, an optical fiber is used as first optical guiding means 116. The optical fiber can be used 5 as second optical guiding means 132 or another optical fiber can be used. The optical fibers cam have the same construction or can be different. The optical fibers are preferably the same construction. The optical fibers can be multiuse (reusable) or single use (disposable). In the 10 second embodiment, a hollow optical waveguide is used as first optical guiding means 116. A hollow optical waveguide can be used as second optical guiding means 132, as well, with slight modification to one end of the optical waveguide to adapt it to formed end 130a of second 15 introducer means 130. The optical fibers of the first embodiment are preferred over the hollow optical waveguides for the present invention. Alternatively, one optical guiding means can be an optical fiber, while the othsr optical guiding means can be an optical wave guide 20 in a third embodiment. The particular optical guicling means used for the different embodiments will depend on the laser means which is also used.
The first and second laser means can be the same laser or two different lasers may be used to produce a 25 laser beam for vaporizing nucleus pulposus. According to the present invention, only one laser is necessary. The laser system used for percutaneous diskectomy according to the present invention can emit energy in the temporal continuous mode or pulse mode in the ultraviolet, visible 30 and in~rared ranges of the electromagnetic spectrum.
Table I lists the lasers and the associated wavelengths for use in percutaneous diskectomies according to the invention. For example, a Nd:YAG laser which emits energy at 1064 nm can be modified by second harmonic generation 35 to create a laser beam at another wavelength. In the preferred embodiment, a Nd:YAG laser which emits light at P \M\1140U'\IP-002.~L . :

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.~:, . , , , - :
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- 26 - 203~Q~4 1064 nm is coupled with a frequency doubler to generate a laser beam at 532 nm. For the preferred embodiment, a ~`
solid state media is used as a frequency doubler, in particular a potassium, titanyl phosphate crystal (KTP), 5 to create a laser system according to the present invention which is usable with either the first or second laser means or both. The laser system of the preferred embodiment, has been used for other percu1:aneous surgical procedures in the areas of gynecology, urology, 10 dermatology, gasteroenterology, otorhinolaryngology, and other neurosurgeries, but has not been used for applying a laser beam in percutaneous diskectomies, according to the present invention. The laser system o~ the preferred embodiment is known in the art as KTP/532~ Surgical Laser 15 System.
TABLE I
LIST OF LASERS FOR USE IN PERCUTANEOUS DISKECTOMY
Laser TY~e Wavelen~th (Nanometers or Micrometers) C2 10.6 ~m C0 5, 7 ~m Erbium:YAG 2.94 ~m ~-Holmium:YAG 1950 nm, 2150 nm Krypton 647 nm Argon 488 nm, 514.5 nm Dye Lasers 350nm, 1000 nm Nd:YAG 1320 nm ~-Nd:YAG 1.44 ~m Nd.YAG ~frequency doubled) 532 nm, 660 nm Nd:YAG (frequency tripled) 354.7 nm, 440 nm Nd:YAG (frequency quadrupled) 266 nm, 330 nm .
Tunable Lasers:
Co:MgF2 1.75 ~m, 2.5 ~m -Ti:Sapphire 660 nm, 990 nm ~;

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.

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TI:Sapphire (frequency doubled3 330 nm, 495 nm Alexandrite 730 nm, 780 nm Alexandrite (frequency doubled) 365 nm, 390 nm ::
Excimer Lasers:
Xenon Chloride 308 nm Xenon Fluoride 248 nm Argon Fluoride 1!33 nm Krypton Fluoride 248 nm :.:
The laser system according to the present invention lO should be any laser which emits laser energy that is absorbed by body tissue. The first and second laser means are preferably one laser system which is used in both the first and second vaporization steps.
Any laser system used in accordance with the present 15 invention that emit~ a laser beam in the ultraviolet or visible range o~ the electromagnetic spectrum can be used in conjunction with optical guiding means 116 and 132 of the first embodiment. Any laser system that emits a laser beam in the infrared range of the electromagnetic spectrum 20 can be used in conjunction with optical guiding means 116 and 132 of the second embodiment. Therefore, the Argon laser for example, or preferably Nd:YAG laser modified by second harmonic generation will emit a laser beam that is conducted by an optical fiber according to the present 25 invention. The C02 laser will emit a laser beam that is conducted by a hollow optical waveguide, according to the present invention. In the third embodiment, two lasers are used, one laser which typically uses an optical fibar to conduct its laser beam and one laser which typically 30 uses a hollow optical waveguide to conduct its laser beam, as described above.
After the second vaporization step according to th~
preferred embodiment, second optical guiding means 132 and second introducer means 130 are removed from cannula 104.

' 2~3401~ `

In the preferred embodiment, cannula 104 is also removed and the entry point through the skin i5 covered with a sterile bandage. The patient is then allowed to leave the hospital and recuperate at home under minimal restrictions 5 or requirements.
Alternatively, in a fourth embodiment an irrigation/
aspiration cannula 150, is inserted into cannula 104 after second introducer means 130 and secoild op1:ical guiding means 13~ are removed. Irrigation/aspiration cannula 150 10 is preferably 15 gauge along its length and has a 17 gauge tip 150a, as illustrated in Figure 28. Cannula 150 is used to evacuate the second vaporization area so that second vaporization area can be further cleansed in the unlikely event that loose fragments or debris might be 15 present. A vacuum suction device is attached to end 150a of cannula 150 and the area is aspirated, be~ore cannula 104 is removed.
The means for inserting instrumentation necessary for percutaneous diskectomy using a laser can be packaged in a 20 kit and sold, for example, for single use or multiple use.
The kit may contain probe 100, straight cannula 104, curved cannula 106, first introducer means 110, second introducer means 130, stylet 112, cannula 150 and tools such as a marking pen, scalpel with blade, measuring scale ~-25 and a locking stabilizer 105. The kit may contain all these items or some of them. Furthermore, optical guiding means }16 and 132 may be included. The laser system according to the preferred and exemplary embodiments may be supplied separately.
While the invention has been described in connection with several exemplary embodiments, it will be understood that many modifications will be apparent to those of ordinary skill in the art, while still being within the intended scope of the present invention.

P:\M\il40\P\lP~02.i~ ~

Claims (28)

1. Apparatus for performing percutaneous diskectomy comprising:
a laser having a laser beam with a wavelength in the range of 350 nanometers through 1,000 nanometers.
2. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 647 nanometers.
3. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 488 nanometers.
4. Apparatus for performing percutaneous diskectomy according to Claim 1 wherein the wavelength is 780 nanometers.
5. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 532 nanometers.
6. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 660 nanometers.
7. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 354.7 nanometers.
8. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 440 nanometers.
9. Apparatus for performing percutaneous diskectomy according to Claim 1 wherein the wavelength is 365 nanometers.
10. Apparatus for performing percutaneous diskectomy according to Claim 1 wherein the wavelength is 390 nanometers.
11. Apparatus for performing percutaneous diskectomy according to Claim 1 wherein the wavelength is 990 nanometers.
12. Apparatus for performing percutaneous diskectomy according to Claim 1 wherein the wavelength is 495 nanometers.
13. Apparatus for performing percutaneous diskectomy according to Claim 1 wherein the wavelength is 730 nanometers.
14. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 514.5 nanometers.
15, Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 266 nanometers.
16. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 249 nanometers.
17. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 193 nanometers.
18. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 5 microns.
19. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 7 microns.
20. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 1,950 nanometers.
21. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 2,150 nanometers.
22. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 330 nanometers.
23. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 1.75 microns.
24. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 2.5 microns.
25. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 1.44 microns.
26. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 248 nanometers.
27. Apparatus for performing percutaneous diskectomy comprising a laser having a laser beam with a wavelength of 2115 nanometers.
28. Apparatus for performing percutaneous diskectomy according to Claim 1, wherein the wavelength is 355 nanometers.
CA002034014A 1990-01-12 1991-01-11 Method for performing percutaneous diskectomy using a laser Abandoned CA2034014A1 (en)

Applications Claiming Priority (4)

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US07/463,759 1990-01-12
US07/463,759 US5084043A (en) 1990-01-12 1990-01-12 Method for performing a percutaneous diskectomy using a laser
US07/621,451 1990-11-30
US07/621,451 US5201729A (en) 1990-01-12 1990-11-30 Method for performing percutaneous diskectomy using a laser

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