Systems and methods for spinal fusion

• US 8,574,301 B2
• Filed: 01/24/2013
• Issued: 11/05/2013
• Est. Priority Date: 03/29/2004
• Status: Active Grant

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Nuvasive Incorporated
• Inventors: Curran, Matthew, Peterson, Mark, Pimenta, Luiz
• Primary Examiner(s): Hammond, Ellen C
• Assistant Examiner(s): BRAY, STUART SAMUEL
• Application Number:
  US13/748,925
• Publication Number:
  US 20130144390A1
• Time in Patent Office: 285 Days
• Field of Search: 623 1711- 1716
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30265 Flat parallelepipeds
• CPC Class Codes: A61F 2002/30266 wedge-shaped parallelepipeds
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/3082 Grooves
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/3093 for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2002/4615 of spacers
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes

Abstract

A system and method for spinal fusion comprising a spinal fusion implant of non-bone construction releasably coupled to an insertion instrument dimensioned to introduce the spinal fusion implant into any of a variety of spinal target sites.

Claims

1. A spinal fusion implant of non-bone construction positionable within an interbody space between a first vertebra and a second vertebra, said implant comprising:

an upper surface including anti-migration elements to contact said first vertebra when said implant is positioned within the interbody space, a lower surface including generally parallel ridges to contact said second vertebra when said implant is positioned within the interbody space, a distal wall, a proximal wall having threaded receiving aperture configured to releasably mate with an inserter tool, a first sidewall, a second sidewall generally opposite from the first sidewall, and a medial support wall extending between the first and second sidewalls and being positioned along a medial plane, wherein said distal wall, proximal wall, first sidewall, second sidewall, and medial support wall comprise a radiolucent material wherein said implant further comprises a pair of lateral grooves positioned in said proximal wall and extending laterally from said threaded receiving aperture;

wherein said implant has a longitudinal length extending from a proximal end of said proximal wall to a distal end of said distal wall, said longitudinal length is greater than 40 mm, said implant having a maximum lateral width extending from said first sidewall to said second sidewall along said medial plane that is generally perpendicular to said longitudinal length, said implant having a height extending from said upper surface to said lower surface and extending generally perpendicular to said longitudinal length and said maximum lateral width, wherein said longitudinal length is greater than said maximum lateral width, and said maximum lateral width is greater than said height, wherein the threaded receiving aperture defined in the proximal wall has a central axis generally parallel to said longitudinal length of said implant; and

first and second fusion apertures extending through said upper surface and lower surface and configured to permit bone growth between the first vertebra and the second vertebra when said implant is positioned within the interbody space, wherein the first and second fusion apertures are positioned on opposite sides of the medial support wall, each of said first and second fusion apertures having;

a longitudinal aperture length extending generally parallel to the longitudinal length of said implant, and a lateral aperture width extending between said first sidewall to said second sidewall, wherein the longitudinal aperture length is greater than the lateral aperture width.

2. The spinal fusion implant of claim 1, further comprising at least first and second radiopaque markers oriented generally parallel to said height of the implant.

3. The spinal fusion implant of claim 2, wherein said first and second radiopaque markers are positioned in said radiolucent material proximate to an outer side face of said first sidewall.

4. The spinal fusion implant of claim 3, further comprising a third radiopaque marker that is positioned in the radiolucent material and that extends in the medial plane.

5. The spinal fusion implant of claim 4, wherein said third radiopaque marker is positioned in said radiolucent material proximate to an outer side face of said second sidewall.

6. The spinal fusion implant of claim 4, wherein said third radiopaque marker extends generally parallel to said height of the implant.

7. The spinal fusion implant of claim 2, wherein the first radiopaque marker extends into said distal wall, and wherein the second radiopaque marker extends into said proximal wall.

8. The spinal fusion implant of claim 1, wherein said anti-migration elements include generally parallel ridges of said upper surface and are configured to engage the first vertebra when said implant is positioned within the interbody space, and wherein said generally parallel ridges of the upper and lower surfaces extend generally perpendicular to said longitudinal length of said implant.

9. The spinal fusion implant of claim 8, wherein two of said generally parallel ridges extend over the medial support wall.

10. The spinal fusion implant of claim 8, wherein said anti-migration elements include generally parallel ridges of said lower surface and are to engage the second vertebra when said implant is positioned within the interbody space.

11. The spinal fusion implant of claim 1, wherein said maximum lateral width of said implant is approximately 18 mm.

12. The spinal fusion implant of claim 1, wherein said maximum lateral width along said medial plane of said implant is greater than a lateral width of the distal end of said distal wall and is greater than a lateral width of the proximal end of said proximal wall.

13. The spinal fusion implant of claim 1, wherein said height of said implant extends in said medial plane, and wherein said height of said implant is greater than a distal face height of said distal wall and is greater than a proximal face height of said proximal wall.

14. The spinal fusion implant of claim 13, wherein said proximal face height of said proximal wall is greater than said distal face height of said distal wall.

15. The spinal fusion implant of claim 1, wherein said radiolucent material comprises PEEK.

16. The spinal fusion implant of claim 1, wherein said implant includes at least one visualization aperture extending through at least one of said first sidewall and said second sidewall.

17. The spinal fusion implant of claim 1, wherein said implant includes four openings defined in said second sidewall, a first pair of said four openings being located in the second sidewall between the proximal wall and said medial support wall, and a second pair of said four openings being located in the second sidewall between the distal wall and said medial support wall.

18. The spinal fusion implant of claim 17, wherein the four openings defined in said second sidewall have the same shape.

19. The spinal fusion implant of claim 1, wherein said upper and lower surfaces are generally parallel to one another.

20. The spinal fusion implant of claim 1, wherein said upper and lower surfaces are generally angled relative to one another to approximately correspond to lordosis of a lumbar spine when said implant is positioned within the interbody space.

21. The spinal fusion implant of claim 1, wherein each of said first and second fusion apertures is one of generally rectangular and generally oblong in shape.

22. The spinal fusion implant of claim 1, wherein the lateral aperture width of said first fusion aperture is more than two time greater than a lateral thickness of said first sidewall and is more than two time greater than a lateral thickness of said second sidewall.

23. The spinal fusion implant of claim 22, wherein the lateral aperture width of said second fusion aperture is more than two time greater than a lateral thickness of said first sidewall and is more than two time greater than a lateral thickness of said second sidewall.

24. The spinal fusion implant of claim 1, further comprising an osteoinductive material positioned with said first fusion aperture.