Intervertebral prosthesis

• US 4,917,704 A
• Filed: 06/08/1988
• Issued: 04/17/1990
• Est. Priority Date: 07/09/1987
• Status: Expired due to Term

• Current Assignee: Zimmer GmbH (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Sulzer Brothers, Ltd (Sulzer AG)
• Inventors: Koch, Rudolf, Frey, Otto
• Primary Examiner(s): Millin, V.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/204,020
• Time in Patent Office: 678 Days
• Field of Search: 623/16, 623/18, 623/17, 623/20, 305/35 EB, 305/13, 152/209 R, 360/32 R, 128/69, 128/92 YM, 128/92 YP
• US Class Current: 623/17.16
• 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 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30909 Nets
• CPC Class Codes: A61F 2230/0015 Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: Y10S 606/907 Composed of particular material or coated
• CPC Class Codes: Y10S 606/91 Polymer

Abstract

The intervertebral prosthesis provides a replacement for a damaged disk. The prosthesis is formed as a solid body of kidney-shape and is provided with a metal mesh covering for the ingrowth of tissue. Raised parts are formed on the opposite surfaces of the kidney-shaped body impart lateral stability when in situ.

Claims

1. An intervertebral prosthesis for an arthrodesis comprising a disk-like body for fitting between a pair of vertebrae, said body having weld-like raised parts disposed on opposite surfaces thereof dimensioned to enhance lateral stability of said body in situ, each said raised part on said body having a cross-section of cylindrical segment shape and forming an acute angle with a second raised part on a respective surface of said body.

2. An intervertebral prosthesis as set forth in claim 1 wherein said angle is equal to 90°

.

3. An intervertebral prosthesis as set forth in claim 1 wherein said raised parts on each surface of said body define a chevron shaped rib directed from ventral to dorsal.

4. An intervertebral prosthesis as set forth in claim 1 wherein said body is kidney-shaped.

5. An intervertebral prosthesis as set forth in claim 1 wherein said body tapers conically from ventral to dorsal.

6. An intervertebral prosthesis as set forth in claim 1 wherein said body is made of synthetic material and which further comprises a metal wire mesh on said opposite surfaces for an ingrowth of tissue.

7. An intervertebral prosthesis as set forth in claim 1 wherein said body is made of a metal selected from the group consisting of titanium and titanium alloy.

8. An intervertebral prosthesis for an arthrodesis comprising a kidney-shaped disk-like body for fitting between a pair of vertebrae, said body having a raised chevron-shaped rib disposed on opposite surfaces thereof to enhance lateral stability of said body in situ, each said rib projecting from a respective surface along the length thereof.

9. An intervertebral prosthesis as set forth in claim 8 wherein each rib has a cross-section of cylindrical segment shape.

10. An intervertebral prosthesis as set forth in claim 8 wherein each chevron shaped rib is directed from ventral to dorsal.

11. An intervertebral prosthesis as set forth in claim 8 wherein said body is made of synthetic material and which further comprises a metal wire mesh on said opposite surfaces for an ingrowth of tissue.

12. An intervertebral prosthesis for an arthrodesis comprising a kidney-shaped disk-like body for fitting between a pair of vertebrae, said body having raised parts disposed on opposite surfaces with each part projecting from a respective surface along the length thereof, each part extending from a ventral edge towards a dorsal edge along an axis intersecting with a ventral-to-dorsal plane of said body and with an axis of another of said parts to enhance lateral stability of said body in situ.

13. An intervertebral prosthesis as set forth in claim 12 wherein said parts on each surface define a chevronshaped rib.

14. An intervertebral prosthesis as set forth in claim 12 wherein said parts on each surface terminate in a region where said axes thereof intersect and a bridge-like web on each surface connects said parts thereat.