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US20030130667A1 - Intervertebral distractor and implant insertion instrument - Google Patents

Intervertebral distractor and implant insertion instrument Download PDF

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Publication number
US20030130667A1
US20030130667A1 US10335004 US33500402A US2003130667A1 US 20030130667 A1 US20030130667 A1 US 20030130667A1 US 10335004 US10335004 US 10335004 US 33500402 A US33500402 A US 33500402A US 2003130667 A1 US2003130667 A1 US 2003130667A1
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Patent type
Prior art keywords
distractor
fig
implant
includes
guide
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
US10335004
Inventor
Jo-Wen Lin
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.)
Osteotech Inc
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Osteotech Inc
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.)
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4611Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
    • A61B17/025Joint distractors
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/4455Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
    • A61F2/446Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
    • A61B17/025Joint distractors
    • A61B2017/0256Joint distractors for the spine
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28Surgical forceps
    • A61B17/29Forceps for use in minimally invasive surgery
    • A61B2017/2926Details of heads or jaws
    • A61B2017/2932Transmission of forces to jaw members
    • A61B2017/2933Transmission of forces to jaw members camming or guiding means
    • A61B2017/2936Pins in guiding slots
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/30795Blind bores, e.g. of circular cross-section
    • A61F2002/30807Plurality of blind bores
    • A61F2002/30808Plurality of blind bores parallel
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/3085Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface

Abstract

A distractor/guide sleeve assembly is provided which includes a body having a cylindrical throughbore and a distractor assembly mounted thereon. The distractor assembly includes a rotatable dial, a pair of distractor rods, and two pairs of jaws. A plate is secured to the distal end of each distractor rod. Each plate includes a plurality of cam members which are slidably positioned in cam slots formed in the jaws of each of the pairs of jaws. The dial is operably connected to the jaws via the distractor rods such that rotation of the dial effects movement of the pairs of jaws between approximated and distracted positions. An insertion tool is also provided which includes a handle and distal engaging structure for releasably engaging an implant. The engaging structure includes a pair of prongs or protrusions having a slip resistant outer surface. The prongs are configured to be releasably received within correspondingly shaped bores formed in an implant.

Description

  • [0001]
    This application is a Divisional application of U.S. application Ser. No. 09/850,494 filed May 7, 2001 and claims priority from Provisional Application Serial No. 60/202,225 filed May 5, 2000 and is hereby incorporated by reference.
  • BACKGROUND
  • [0002]
    1. Technical Field
  • [0003]
    The present disclosure relates generally to instrumentation for inserting an implant into a body receiving bed. More particularly, the present disclosure relates to instrumentation for guiding and positioning a dowel into a receiving bed formed in an intervertebral space.
  • [0004]
    2. Background to Related Art
  • [0005]
    Distractors and guide sleeves for positioning an implant into a receiving bed in the intervertebral space are well known. These distractors include forceps type distractors as well as wedge type distractors which are pushed into the intervertebral space and distract upon insertion. The guide sleeve typically includes a cylindrical sleeve which is mounted to the adjacent vertebrae such that the instruments and implant can be positioned in the intervertebral space through the cylindrical sleeve. At least with respect to wedge type distractors, distraction of the vertebrae occurs unevenly with the front face of the vertebrae being distracted first. This is not desirable.
  • [0006]
    Accordingly, a need exists for an improved distractor/guide sleeve assembly which includes a simple integral assembly and provides for uniform distraction of adjacent vertebrae. A need also exists for an insertion tool useable with the distractor/guide sleeve assembly for inserting an implant into the intervertebral space.
  • SUMMARY
  • [0007]
    In accordance with the present disclosure, a distractor/guide sleeve assembly is provided which includes a body having a cylindrical throughbore and a distractor assembly mounted thereon. The distractor assembly includes a rotatable dial, a pair of distractor rods, and two pairs of jaws. A plate is secured to the distal end of each distractor rod. Each plate includes a plurality of cam members which are slidably positioned in cam slots formed in the jaws of each of the pairs of jaws. The dial is operably connected to the distractor rods such that rotation of the dial effects axial movement of the distractor rods. Axial movement of the distractor rods cause corresponding movement of each of the plates to move the cam members within the cam slots formed in each of the jaws. Movement of the cam members within the cam slots effects movement of each of the pairs of jaws between approximated and distracted positions.
  • [0008]
    An insertion tool is also provided which includes a handle and distal engaging structure for releasably engaging an implant. The engaging structure includes a pair of prongs or protrusions having a slip resistant outer surface. The prongs are configured to be releasably received within correspondingly shaped bores formed in an implant.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0009]
    Various preferred embodiments of the presently disclosed distractor/guide sleeve assembly are described herein with reference to the drawings, wherein:
  • [0010]
    [0010]FIG. 1 is a perspective view of one preferred embodiment of the presently disclosed distractor/guide sleeve assembly;
  • [0011]
    [0011]FIG. 1A is a perspective view with parts separated of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0012]
    [0012]FIG. 2 is a side view of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0013]
    [0013]FIG. 2A is a front view of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0014]
    [0014]FIG. 3A is a top view of the ring of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0015]
    [0015]FIG. 3B is a side cross-sectional view of the ring shown in FIG. 3A taken along section lines 3B-3B in FIG. 3A;
  • [0016]
    [0016]FIG. 3C is a top view of the dial of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0017]
    [0017]FIG. 3D is a side cross-sectional view of the dial shown in FIG. 3C taken along section lines 3D-3D in FIG. 3C;
  • [0018]
    [0018]FIG. 4 is a side view of the distractor rod of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0019]
    [0019]FIG. 4A is a side cross-sectional view of the distractor rod shown in FIG. 4;
  • [0020]
    [0020]FIG. 5 is side view of one plate portion of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0021]
    [0021]FIG. 5A is a top view of the plate portion shown in FIG. 5;
  • [0022]
    [0022]FIG. 6 is a side view of one jaw of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0023]
    [0023]FIG. 6A is a front view of the jaw shown in FIG. 6;
  • [0024]
    [0024]FIG. 7 is a front view of one cover plate of the distractor/guide sleeve assembly shown in FIG. 1;
  • [0025]
    [0025]FIG. 7A is a side view of the cover plate shown in FIG. 7;
  • [0026]
    [0026]FIG. 8 is a front view of one preferred embodiment of the presently disclosed implant insertion tool;
  • [0027]
    [0027]FIG. 9 is a front view of the distal end of the insertion tool shown in FIG. 8;
  • [0028]
    [0028]FIG. 10 is a side view of one preferred embodiment of the presently disclosed implant; and
  • [0029]
    [0029]FIG. 11 is a side cross-sectional view of the implant shown in FIG. 10 taken along section lines 11-11 in FIG. 10
  • DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
  • [0030]
    Preferred embodiments of the presently disclosed distractor/guide sleeve assembly will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views.
  • [0031]
    [0031]FIGS. 1 and 1A illustrate perspective views of the presently disclosed distractor/guide sleeve assembly, which is shown generally as 10. Distractor/guide sleeve assembly 10 includes a body 12, a rotatable dial 14, a ring 16, a pair of distractor rods 18, two pairs of jaws 20 a and 20 b and a pair of cover plates 22 a and 22 b. As will be described in greater detail below, dial 14 is rotatable to retract or advance distractor rods 18 to effect opening and closing, i.e., of each pair of jaws 20 a and 20 b.
  • [0032]
    Referring to FIGS. 2 and 2A, distractor body 12 includes a tubular portion 24 and a hollow rectangular base portion 26 which are integrally formed. Although not shown, windows or openings may be formed in tubular portion 24 or base portion 26 to provide visibility. Tubular portion 24 defines a lumen 28 (FIG. 1) having a first open end 28 a and a second end 28 b in communication with hollow base portion 26. A semi-circular rod guide 30 is formed on each side of tubular portion 24. Rod guides 30 are configured to slidably receive and guide distractor rods 18. First end 28 a of tubular portion 24 includes a series of threads 32 for rotatably receiving dial 14.
  • [0033]
    Referring to FIGS. 3a and 3 b, ring 16 is circular and includes a pair of stepped bores 34 and an annular channel 36 formed thereabout. Stepped bores 34 are dimensioned to receive screws 38 (FIG. 1A) for securing rods 18 to ring 16. Ring 16 is secured within dial 14 (see FIGS. 3c and 3 d) with pins 40 (FIG. 1A). Pins 40 extend through openings 42 in dial 14 into annular channel 36 of ring 16 to secure ring 16 within dial 14 while allowing dial 14 to rotate in relation to ring 16. Dial 14 includes a grooved outer surface 15 to facilitate gripping and rotating dial 14. Dial 14 also includes a threaded bore 17 dimensioned to receive threaded first end 28 a of body 12.
  • [0034]
    Referring to FIGS. 4, 4A, 5 and 5A, each distractor rod 18 includes a rod portion 44 and a plate portion 46. Rod portion 44 includes a first end having a threaded bore 48 and a second end having a slot 50 formed therein. Each threaded bore 48 is dimensioned to receive screw 38 (FIG. 1A) to secure the first end of rod portion 44 to ring 16. Each slot 50 of rod portion 44 is configured and dimensioned to slidably receive plate portion 46. Plate portion 46 is frictionally retained within slot 50. Alternately, other retaining means may be used to secure plate portion 46 within slot 50, e.g., screws, adhesives, ultrasonic welding, etc.
  • [0035]
    Plate portion 46 includes a paddle section 52 and a handle section 54. Handle section 54 is dimensioned to be received in slot 50 of rod portion 44. Paddle section 52 includes a flat base 51 having a plurality of cam members 56 extending therefrom. Cam members 56 will be described in further detail below.
  • [0036]
    Referring to FIGS. 6 and 6A, each jaw 20 of the two pair of jaws 20 a and 20 b includes a body 60 having a distally extending finger 62. Body 60 includes one or more cam slots 64 formed therein. Preferably body 60 includes two cam slots, although three or more may be provided. Alternately, only a single cam slot need be provided. Cam slots 64 are dimensioned to receive cam members 56 formed on plate portion 46 of distractor rods 18. Alternately, only a single pair of jaws need be provided on the distractor/guide sleeve. Such an embodiment would also require only a single distractor rod and cover plate.
  • [0037]
    Referring to FIGS. 7 and 7A cover plates 22 a and 22 b are secured to open sides of base portion 26 to retain jaws 20 and plate portion 46 of distractor rods 18 in engagement. Cover plates 22 a and 22 b may snap fit to base portion 26 or other attachment means may be provided, e.g., screws, welding, adhesives, etc.
  • [0038]
    In operation, when dial 14 is rotated in a clockwise direction on the threaded end of body 12, dial 14 advances ring 16 towards the second end of body 12. Movement of ring 16 advances distractor rods 18 in a direction parallel to the longitudinal axis of body 12, thus advancing cam members 56 in a direction parallel to the longitudinal axis of body 12. As cam members 56 move in relation to cam slots 64, each jaw 20 of each pair of jaws 20 a and 20 b is urged outward away from the longitudinal axis of body 12 to increase the spacing between the fingers 62 of each pair of jaws 20 a and 20 b. When dial 14 is rotated in a counter-clockwise direction, rods 18 are retracted to decrease the spacing between each of fingers 62 of each pair of jaws 20 a and 20 b in a manner similar to that described above.
  • [0039]
    The above described distractor/guide sleeve may be used to distract adjacent vertebrae during spinal surgery, e.g., a cervical spinal fusion procedure. The distractor body including the tubular portion and the base portion function as a guide for the surgical instruments used during the surgical procedure, e.g., reamers, taps, insertion tool, etc. Once the guide sleeve has been parked in the intervertebral space, with fingers 62 positioned between adjacent vertebrae, dial 14 can be rotated to distract the adjacent vertebrae. It is no longer necessary to relocate the proper graft bed after each time a surgical instrument is used, since the distractor/guide sleeve is secured in a fixed location with respect to the graft bed during the entire procedure. Moreover, the presently disclosed jaw structure provides a sturdy structure which minimizes wobbling which may occur while using the surgical instruments.
  • [0040]
    [0040]FIGS. 8 and 9 illustrate an insertion tool, shown generally as 100, for inserting a thread implant into an implant receiving bed. Insertion tool 10 includes a handle 110, an elongated shaft 111 and an implant engaging structure 120. Implant engaging structure 120 is secured to or formed integrally with elongated shaft 111 and includes a base member 112 and a pair of protrusions or prongs 114. Base member 112 includes a flat face which abuts the trailing end of an implant when the implant is supported on the insertion tool. Protrusions 114 have an outer surface 116 which is at least partially roughened. The roughened surface may include ridges, knurling, dimples or any other slip resistant surface.
  • [0041]
    [0041]FIGS. 10 and 11 illustrate an implant 200 having a cylindrical threaded body 210 and top and bottom surfaces 212 and 214. Implant 200 is constructed from a biocompatible material. Preferably, implant 200 is formed from cortical or cancellous bone. Top surface 212 includes a pair of substantially cylindrical bores 216 formed therein. Bores 216 are positioned to receive protrusions 114 (FIG. 9) and have an inside diameter substantially equal to the outside diameter of protrusions 114. When protrusions 114 are pressed into bores 216, roughened outer surface 116 of protrusions 114 prevent implant 200 from separating from engaging structure 120 without applying additional force to implant 200.
  • [0042]
    In use, after implant 200 has been positioned on engaging structure 120 of insertion tool 100, handle 110 can be manipulated to thread implant 200 into a previously prepared receiving bed, e.g., a tapped bore formed between adjacent vertebrae during a spinal fusion surgical procedure. Thereafter, insertion tool 100 can be pulled rearwardly with a force sufficient to overcome the frictional engagement between protrusions 114 and bores 26 to separate the implant from the insertion tool.
  • [0043]
    It will be understood that various modifications may be made to the embodiments disclosed herein. For example, any materials having the requisite strength requirements which are suitable for surgical use may be used to construct the distractor/guide sleeve assembly and insertion tool including surgical grade stainless steel, plastics, etc. Moreover, the size of the distractor/guide sleeve may be changed to suit a particular surgical procedure, e.g., cervical spinal fusion, lumbar spinal fusion, thoracic spinal fusion, etc. Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of this disclosure.

Claims (4)

  1. 1. An implant insertion tool comprising a handle, an elongated shaft defining a longitudinal axis and a head portion, the head portion including a pair of prongs, each prong extending in a direction substantially parallel to the longitudinal axis of the elongated shaft.
  2. 2. An implant insertion tool according to claim 1, wherein each of the prongs include a slip resistant surface.
  3. 3. An implant insertion tool according to claim 2, wherein the slip resistant surface includes a plurality of ridges.
  4. 4. An implant insertion tool according to claim 3, wherein each of the prongs is secured to a base member supported on the distal end of the elongated shaft, the base member having a face configured to abut against one end of an implant.
US10335004 2000-05-05 2002-12-30 Intervertebral distractor and implant insertion instrument Abandoned US20030130667A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US20222500 true 2000-05-05 2000-05-05
US09850494 US6569168B2 (en) 2000-05-05 2001-05-07 Intervertebral distractor and implant insertion instrument
US10335004 US20030130667A1 (en) 2000-05-05 2002-12-30 Intervertebral distractor and implant insertion instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10335004 US20030130667A1 (en) 2000-05-05 2002-12-30 Intervertebral distractor and implant insertion instrument

Related Parent Applications (1)

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US09850494 Division US6569168B2 (en) 2000-05-05 2001-05-07 Intervertebral distractor and implant insertion instrument

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US20030130667A1 true true US20030130667A1 (en) 2003-07-10

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US09850494 Active 2021-05-22 US6569168B2 (en) 2000-05-05 2001-05-07 Intervertebral distractor and implant insertion instrument
US10335004 Abandoned US20030130667A1 (en) 2000-05-05 2002-12-30 Intervertebral distractor and implant insertion instrument

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US20040243242A1 (en) * 2001-02-14 2004-12-02 Sybert Daryl R. Implant derived from bone
US20040249377A1 (en) * 2001-07-12 2004-12-09 Kaes David R. Intervertebral implant with movement resistant structure
US20050038511A1 (en) * 2003-08-15 2005-02-17 Martz Erik O. Transforaminal lumbar interbody fusion (TLIF) implant, surgical procedure and instruments for insertion of spinal implant in a spinal disc space
US20050251146A1 (en) * 2002-07-19 2005-11-10 Martz Erik O Chisels and procedure for insertion of spinal implant in a spinal disc space
US20060095043A1 (en) * 2004-10-19 2006-05-04 Martz Erik O Adjustable instrumentation for spinal implant insertion
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US8486081B2 (en) 2007-07-23 2013-07-16 DePuy Synthes Products, LLC Implant insertion device and method
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US6569168B2 (en) 2003-05-27 grant

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