Systems and methods for spinal fusion

• US 9,744,053 B2
• Filed: 09/21/2016
• Issued: 08/29/2017
• 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:
  US15/272,071
• Publication Number:
  US 20170007421A1
• Time in Patent Office: 342 Days
• 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 configured to be positioned between a first vertebra and a second vertebra, comprising:

a proximal wall, a distal wall, a first sidewall and a second sidewall opposite the first sidewall, the first sidewall and the second sidewall extending between the proximal wall and the distal wall, the implant comprising a longitudinal length extending along a longitudinal axis extending between the proximal wall and the distal wall, a maximum lateral width extending along a lateral axis perpendicular to the longitudinal axis, the longitudinal length being greater than the maximum lateral width;

an upper surface of the implant comprising upper surfaces of the proximal wall, the distal wall, the first sidewall and the second sidewall, the upper surface of the implant comprising a first plurality of ridges configured to be in contact with the first vertebra while the implant is positioned between the first vertebra and the second vertebra, and an upper surface of the first sidewall and an upper surface the second sidewall having a first convex curvature;

a lower surface of the implant comprising lower surfaces of the proximal wall, the distal wall, the first sidewall and the second sidewall, the lower surface of the implant comprising a second plurality of ridges configured to be in contact with the second vertebra while the implant is positioned between the first vertebra and the second vertebra, and a lower surface of the first sidewall and the second sidewall comprising a second convex curvature;

a tool engagement aperture in the proximal wall configured to engage with an insertion tool for delivering the implant to a target position between the first vertebra and the second vertebra;

a medial support extending between the first sidewall and the second sidewall along a medial plane of the implant; and

a first fusion aperture and a second fusion aperture extending through an entire height of the implant to permit bone growth therewithin between the first vertebra and the second vertebra, the fusion apertures on opposing sides of the medial support, further comprising a first radiopaque marker, a second radiopaque marker, and a third radiopaque marker, the first radiopaque marker comprising at least a portion in the distal wall, the second radiopaque marker comprising at least a portion in the proximal wall, and the third radiopaque marker comprising at least a portion in the first sidewall or the second sidewall.

2. The implant of claim 1, further comprising a spike element, the spike element comprising at least a portion protruding from the upper surface of the implant, the at least a portion of the spike element being configured to be in contact with the first vertebra while the implant is positioned between the first vertebra and the second vertebra.

3. The implant of claim 2, wherein the spike element comprises at least another portion extending into the distal wall, the proximal wall, the first sidewall or the second sidewall.

4. The implant of claim 2, wherein the spike element comprises a radiopaque material.

5. The implant of claim 1, further comprising at least a portion of a radiopaque marker within at least one of the distal wall, the proximal wall, the first sidewall, and the second sidewall.

6. The implant of claim 1, wherein the at least a portion of the third radiopaque marker is in the medial plane of the implant.

7. The implant of claim 1, further comprising a first, second, third, fourth, fifth, sixth, seventh, and eighth visualization aperture, wherein the first visualization aperture and the second visualization aperture are disposed in the first sidewall, and the third visualization aperture and the fourth visualization aperture are disposed in the second sidewall, and wherein the first, second, third and fourth visualization apertures are in communication with the first fusion aperture, and wherein the fifth visualization aperture and the sixth visualization aperture are disposed in the first sidewall and the seventh visualization aperture and the eighth visualization aperture are disposed in the second sidewall, and wherein the fifth, sixth, seventh and eighth visualization apertures are in communication with the second fusion aperture.

8. The implant of claim 1, wherein the proximal wall further comprises a pair of lateral grooves configured to receive corresponding portions of the insertion tool, the pair of lateral grooves extending horizontally in opposing directions from the tool engagement aperture.

9. The implant of claim 1, wherein the tool engagement aperture is a threaded aperture extending along an axis parallel to the longitudinal axis of the implant.

10. The implant of claim 1, wherein the tool engagement aperture is a circular hole.

11. The implant of claim 1, wherein the first fusion aperture and the second fusion aperture comprises a rectangular shape.

12. The implant of claim 1, wherein the medial support comprises an upper surface comprising a third plurality of ridges.

13. The implant of claim 1, wherein the first plurality of ridges are not disposed on at least a portion of the upper surface of the distal wall and the upper surface of the proximal wall.

14. The implant of claim 1, wherein the second plurality of ridges are not disposed on at least a portion of the lower surface of the distal wall and the proximal wall.

15. The implant of claim 1, wherein a portion of the upper surface and a portion of the lower surface of the distal wall are angled relative to one another to provide a tapered distal portion.