Systems and methods for spinal fusion

• US 7,918,891 B1
• Filed: 03/29/2005
• Issued: 04/05/2011
• Est. Priority Date: 03/29/2004
• Status: Active Grant

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Nuvasive Incorporated
• Inventors: Peterson, Mark, Curran, Matthew
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): FISHER, ELANA BETH
• Application Number:
  US11/093,409
• Time in Patent Office: 2,198 Days
• Field of Search: 623 1711- 1716, 606/99
• 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 positionable within an interbody space between a first vertebral endplate and a second vertebral endplate, said interbody space being at least partially defined by a posterior aspect, an anterior aspect, and opposing lateral aspects, the implant being positionable from a lateral approach to extend from one lateral aspect to the other, said implant comprising:

a top surface including a plurality of ridges to engage said first vertebral endplate when said implant is positioned within the interbody space, a bottom surface including a plurality of ridges to engage said second vertebral endplate when said implant is positioned within the interbody space, a distal side, a proximal side, a first side wall defining an anterior side when said implant is positioned within the interbody space, and a second side wall defining a posterior side when said implant is positioned within the interbody space;

wherein said implant has a length extending from said proximal side to said distal side, a width extending from said first side wall to said second side wall, and a height extending from said top surface to said bottom surface;

wherein said implant has a length extending from said proximal side to said distal side, a width extending from said first side wall to said second side wall, and height extending from said top surface to said bottom surface;

wherein said length is at least two and half times greater than said width;

wherein said width is greater than said height;

said implant further including first and second fusion apertures that each extend between the top and bottom surfaces and permit bone growth between the first vertebral endplate and the second vertebral endplate when said implant is positioned within the interbody space, said first and second fusion apertures being adjacent to one another and separated by a medial support extending parallel to said promixal and said distal sides and between said top and bottom surfaces;

said implant further including at least three radiopaque markers situated between said top and bottom surfaces;

wherein a first of the at least three radiopaque markers is disposed within said distal side of the implant, a second of the at least three radiopaque markers is disposed within said proximal side and a third of the at least three radiopaque markers is disposed within said medial support.

2. The spinal fusion implant of claim 1, wherein said implant is substantially radiolucent and composed of non-bone material.

3. The implant of claim 2, wherein said non-bone material is one of PEEK and PEKK.

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

5. The spinal fusion implant of claim 1, wherein the top and bottom surfaces of the implant are at least one of generally parallel with respect to each other, and generally angled with respect to each other to better match the natural curvature of the spine.

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

7. The spinal fusion implant of claim 1, further including at least one receiving element at least partially defined along said proximal side.

8. The spinal fusion implant of claim 7, wherein said receiving element is engageable with an insertion instrument.

9. The spinal fusion implant of claim 8, wherein said receiving element comprises a threaded aperture.

10. The spinal fusion implant of claim 9, wherein said receiving implant further comprises a slot extending from said threaded aperture.

11. The implant of claim 7, wherein said implant includes at least one visualization aperture extending through at least one of said posterior side and said anterior side.

12. The spinal fusion implant of claim 11, wherein said spinal fusion implant includes exactly four visualization apertures in communication with a first of said fusion apertures from said pair of fusion apertures and exactly four visualization apertures in communication with a second of said fusion apertures from said pair of fusion apertures.

13. The spinal fusion implant of claim 12, wherein two of said visualization in communication with said first fusion aperture are situated in said first side, two of said fusion apertures in communication with said first fusion aperture are situated in said second side, two of said visualization apertures in communication with said second fusion aperture are situated in said first side, and two of said fusion apertures in communication with said second fusion aperture are situated in said second side.

14. The spinal fusion implant of claim 11, wherein said spinal fusion implant includes exactly six visualization apertures in communication with a first of said fusion apertures from said pair of fusion apertures and exactly six visualization apertures in communication with a second of said fusion apertures from said pair of fusion apertures.

15. The spinal fusion implant of claim 14, wherein three of said visualization apertures in communication with said first fusion aperture are situated in said first side, three of said fusion apertures in communication with said first fusion aperture are situated in said second side, three of said visualization apertures in communication with said second fusion aperture are situated in said first side, and three of said fusion apertures in communication with said second fusion aperture are situated in said second side.

16. The implant of claim 7, wherein a portion of said implant adjacent said distal side is tapered.

17. The implant of claim 7, further including at least one anti-migration features comprising at least one of a set of ridges formed in the top surface, a set of ridges formed in the bottom surface, a set of ridges on the top and bottom surfaces, one or more spike elements protruding from the top surface, one or more spike elements protruding from the bottom surface, and one or more spike elements protruding from the top and bottom surface.

18. The spinal fusion implant of claim 1, wherein said spinal fusion implant includes exactly four visualization apertures in communication with said first fusion aperture and exactly four visualization apertures in communication with said second fusion aperture.

19. The spinal fusion implant of claim 18, wherein two of said visualization apertures in communication with said first fusion aperture are situated in said first side, two of said fusion apertures in communication with said first fusion aperture are situated in said second side, two of said visualization apertures in communication with said second fusion aperture are situated in said first side, and two of said fusion apertures in communication with said second fusion aperture is situated in said second side.

20. The spinal fusion implant of claim 1, wherein said spinal fusion implant includes exactly six visualization apertures in communication with said first fusion aperture and exactly six visualization apertures in communication with said second fusion aperture.

21. The spinal fusion implant of claim 20, wherein three of said visualization apertures in communication with said first fusion aperture are situated in said first side, three of said fusion apertures in communication with said first fusion aperture are situated in said second side, three of said visualization apertures in communication with said second fusion aperture are situated in said first side, and three of said fusion apertures in communication with said second fusion aperture are situated in said second side.

22. A spinal fusion implant of non-bone construction positionable via a lateral trans-psoas surgical approach to the spine into a position within an interbody space between a first vertebra and a second vertebra, said interbody space being at least partially defined by a posterior aspect, an anterior aspect, and opposing lateral aspects, said implant comprising:

a top surface to contact said first vertebra when said implant is positioned within the interbody space, a bottom surface to contact said second vertebra when said implant is positioned within the interbody space, a distal side, a proximal side, a first side to face said anterior aspect of said disc space when said implant is positioned within the interbody space and a second side to face said posterior aspect of said disc space when said implant is positioned within the interbody space, wherein said implant is generally rectangular in shape having a length extending from said proximal side to said distal side of at least 40 mm, a width extending from said first side to said second side of at least 15 mm, and a height extending from said top surface to said bottom surface ranging from 8 mm to 16 mm, said implant further including a pair of fusion apertures comprising one of a generally rectangular and generally oblong shape and extending between said top surface and bottom surface to permit bone growth between the first vertebra and the second vertebra, said pair of fusion apertures being separated by a medial support extending parallel to aid proximal and said distal sides and between said top and bottom surfaces, said implant further including at least three radiopaque markers situated between said top and bottom surfaces;

wherein a first of the at least three radiopaque markers is disposed within said distal side, a second of said at least three radiopaque markers is disposed within said proximal side and a third of said at least three radiopaque markers is disposed within said medial support.

23. The spinal fusion implant of claim 22, further including at least one receiving element at least partially defined along said proximal side.

24. The spinal fusion implant of claim 23, wherein said receiving element is engageable with an insertion instrument.

25. The spinal fusion implant of claim 24, wherein said receiving element comprises a threaded aperture.

26. The spinal fusion implant of claim 25, wherein said receiving implant further comprises a slot extending from said threaded aperture.