Allograft spinal implant

• US 7,018,412 B2
• Filed: 08/20/2002
• Issued: 03/28/2006
• Est. Priority Date: 08/20/2001
• Status: Expired due to Term

• Current Assignee: Zimmer Biomet Spine, Inc. (Zimvie Incorporated)
• Original Assignee: EBI LP (Zimvie Incorporated)
• Inventors: Ferreira, Rui J., Schwardt, Jeffrey D., Kucharzyk, Donald
• Primary Examiner(s): Barrett, Thomas
• Assistant Examiner(s): Prone, Christopher D
• Application Number:
  US10/225,090
• Publication Number:
  US 20030069640A1
• Time in Patent Office: 1,316 Days
• Field of Search: 623/17.11, 623/17.16, 623/17.15, 606/61, 606/99
• US Class Current: 623/17.11
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• 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 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30116 partial circles, i.e. circular segments
• CPC Class Codes: A61F 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30233 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30822 Circumferential grooves
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0004 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: Y10S 606/909 : Bone

Abstract

An allograft spinal implant includes a generally planar superior end face, a generally planar inferior end face and a generally cylindrical sidewall. The generally cylindrical sidewall extends between the superior end face and the inferior end face. At least one of the superior end face and the inferior end face includes a plurality of concentric circular ridges.

Claims

1. An allograft spinal implant comprising:

a generally planar superior end face;

a generally planar inferior end face; and

a first generally curved sidewall extending between the superior end face and the inferior end face, the first sidewall terminating at first and second generally planar end walls extending between the superior end face and the interior end face, the first and second end walls both angularly crossing the first generally curved sidewall;

at least one of the superior end face and the inferior end face having a plurality of concentric circular arc continuous non-serrated ridges, at least some of the concentric circular arc continuous ridges of the plurality of concentric circular arc continuous ridges extending from the first end wall to the second end wall.

2. The allograft spinal implant spacer of claim 1, wherein the spacer is toroidal.

3. The allograft spinal implant spacer of claim 1, wherein the first sidewall comprises a circular arc.

4. The allograft spinal implant spacer of claim 1, wherein both of the superior end face and the inferior end face have a plurality of concentric circular arc continuous ridges.

5. The allograft spinal implant spacer of claim 3, wherein the first generally curved sidewall is an outer sidewall.

6. The allograft spinal implant spacer of claim 5, further comprising a second generally curved sidewall that is an inner sidewall.

7. The allograft spinal implant spacer of claim 6, wherein the radius of curvature of the second generally curved sidewall is distinct from the radius of curvature of the first generally curved sidewall.

8. The allograft spinal implant spacer of claim 6, wherein the radius of curvature of the second generally curved sidewall is smaller than the radius of curvature of the first generally curved sidewall.

9. The allograft spinal implant spacer of claim 6, further comprising at least one aperture extending from the generally planar superior end face to the generally planar inferior end face between the first and second generally curved sidewalls.

10. The allograft spinal implant spacer of claim 6, further comprising a plurality of apertures extending from the generally planar superior end face to the generally planar inferior end face between the first and second generally curved sidewalls.

11. The allograft spinal implant spacer of claim 3, wherein the generally planar superior end face is angled relative to the generally planar inferior end face.

12. The allograft spinal implant spacer of claim 11, wherein the second generally curved sidewall has a height greater than the first generally curved sidewall.

13. An allograft spinal implant comprising:

a generally planar superior end face;

a generally planar inferior end face; and

first and second generally curved sidewalls extending between the superior end face and the inferior end face; and

terminating at first and second generally planar end walls extending between the superior end face and the inferior end face, the first and second end walls both angularly crossing the first generally curved sidewall;

wherein at least one of the superior and inferior end faces has a plurality of concentric circular arc continuous non-serrated ridges; and

wherein the first and second generally curved sidewalls and the ridges of the plurality of concentric circular arc continuous ridges each have a center of curvature along a common imaginary line.

14. The allograft spinal implant spacer of claim 13, wherein both of the superior end face and the inferior end face have a plurality of concentric circular arc continuous ridges.

15. The allograft spinal implant spacer of claim 13, wherein the radius of curvature of the second generally curved sidewall is distinct from the radius of curvature of the first generally curved sidewall.

16. The allograft spinal implant spacer of claim 13, wherein the radius of curvature of the second generally curved sidewall is smaller than the radius of curvature of the first generally curved sidewall.

17. The allograft spinal implant spacer of claim 13, further comprising at least one aperture extending from the generally planar superior end face to the generally planar inferior end face between the first and second generally curved sidewalls.

18. The allograft spinal implant spacer of claim 13, further comprising a plurality of apertures extending from the generally planar superior end face to the generally planar inferior end face between the first and second generally curved sidewalls.

19. The allograft spinal implant spacer of claim 13, wherein the generally planar superior end face is angled relative to the generally planar inferior end face.

20. An allograft spinal spacer comprising:

a first curved sidewall having an outer generally convex surface, an inner surface, and generally planar superior and inferior surfaces defining a first height therebetween;

a second curved sidewall having an outer generally concave surface, an inner surface facing the inner surface of the first curved sidewall, and generally planar superior and inferior surfaces defining a second height therebetween;

first and second generally planar end walls connecting the first curved sidewall to the second curved sidewall, the first and second generally planar end walls extending between the superior and inferior surfaces of the first and second curved sidewalls and oriented at an angle relative the outer and inner surfaces of the first and second curved sidewalls; and

a plurality of concentric arc continuous non-serrated ridges defined on the superior or inferior surface of at least one of the first and second sidewalls.

21. The allograft spinal spacer of claim 20, further comprising at least one aperture between the first and second sidewalls and extending along a superior-inferior direction.

22. The allograft spinal spacer of claim 20, wherein the first and second heights are unequal.

23. The allograft spinal spacer of claim 20, wherein the outer surface of the second curved sidewall comprises a circular arc.