Spinal implant

• US 7,938,857 B2
• Filed: 07/06/2007
• Issued: 05/10/2011
• Est. Priority Date: 11/09/2001
• Status: Expired due to Fees

• Current Assignee: Zimmer Biomet Spine, Inc. (Zimvie Incorporated)
• Original Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Inventors: Krueger, David J., Wagner, Erik J., Garcia-Bengochea, Javier
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): Comstock; David
• Application Number:
  US11/774,340
• Publication Number:
  US 20080195209A1
• Time in Patent Office: 1,404 Days
• Field of Search: 623/17.11, 623/17.16, 606/246, 606/90, 606/105
• US Class Current: 623/17.11
• CPC Class Codes: A61B 17/0206 with antagonistic arms as supports for retractor elements
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/88 Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices A61B17/7074 takes precedence
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61B 2090/062 penetration depth
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• 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 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30777 : Oblong apertures
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30789 : perpendicular with respect to each other
• CPC Class Codes: A61F 2002/3082 : Grooves
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/30922 : Hardened surfaces
• CPC Class Codes: A61F 2002/30952 : using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• 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 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00359 : Bone or bony tissue
• CPC Class Codes: A61F 2310/00616 : Coating made of titanium oxide or hydroxides
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

A spinal implant may be made of two or more implant members. In an embodiment, implant members may be joined together by a rotational connection that inhibits separation of the members as well as axial movement of the members relative to each other. Implant members may be coupled together by a pin or pins, adhesive, or other fasteners to inhibit separation and/or rotation of the members relative to each other.

Claims

1. A spinal implant, comprising:

two or more members joined together via at least one rotational dovetail and at least one fastener, the spinal implant having;

a first end;

a second end;

a length from the first end to the second end;

a top side;

a bottom side;

a left side;

a right side;

wherein the implant comprises a four-sided cross section about its top side, bottom side, left side, and right side, and

wherein the first end is tapered from the top side, bottom side, left side, and right side to form a rounded tip.

2. The spinal implant of claim 1,

wherein the implant comprises a substantially rectangular cross section about its top side, bottom side, left side, and right side.

3. The spinal implant of claim 1, further comprising a passage through the implant.

4. The spinal implant of claim 3, wherein the passage extends from the top side to the bottom side.

5. The spinal implant of claim 1, further comprising x-ray sensitive material.

6. The spinal implant of claim 5, wherein the x-ray sensitive material is tantalum.

7. The spinal implant of claim 5, wherein the x-ray sensitive material is located near the anterior end.

8. The spinal implant of claim 1, wherein the top side comprises serrations.

9. The spinal implant of claim 8, wherein the bottom side comprises serrations.

10. The spinal implant of claim 8, wherein serration height varies along the length of the implant.

11. The spinal implant of claim 8, wherein frequency of the serrations varies along a length of the implant.

12. The spinal implant of claim 1, further comprising a groove for coupling to an inserter instrument.

13. The spinal implant of claim 1, further comprising indicia for identifying size, shape, or other information about the implant.

14. The spinal implant of claim 1, wherein the implant comprises bone.

15. The spinal implant of claim 1, wherein the implant comprises polyether ether ketone.

16. The spinal implant of claim 1, wherein the implant comprises polyether ether ketone and x-ray sensitive material.

17. The spinal implant of claim 1, wherein the implant comprises metal.

18. The spinal implant of claim 17, wherein the metal is titanium.

19. The spinal implant of claim 1, wherein the top surface of the implant is treated to promote osseointegration of the implant with a vertebra.

20. The spinal implant of claim 1, further comprising at least one horizontal passage through a side of the implant.

21. The spinal implant of claim 1, wherein the top surface is roughened to promote fusion of the top surface with the bone.

22. The spinal implant of claim 1,

wherein:

the first end is a posterior end;

the second end is an anterior end;

the length is from the posterior end to the anterior end;

the top side comprises serrations;

the bottom side comprises serrations;

a first passage through the implant from the top side to the bottom side;

a second passage through the implant from the right side to the left side;

wherein the implant comprises a four-sided cross section about its top side, bottom side, left side, and right side,

wherein the posterior side is substantially flat, and

wherein the anterior end is tapered from the top side, bottom side, left side, and right side.