Metallic intervertebral prosthesis

• US 4,955,908 A
• Filed: 06/08/1988
• Issued: 09/11/1990
• 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.
• Application Number:
  US07/203,950
• Time in Patent Office: 825 Days
• Field of Search: 623/17, 128/69, 128/92 YM, 606/61
• 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 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• 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

Abstract

The metallic intervertebral prosthesis is formed of a kidney-shaped body having fishplates extending upwardly and downwardly from the body. Each fishplate has an opening for passage of a bone screw in order to secure the prosthesis to and between adjacent vertebrae. The body is tapered conically from ventral to dorsal and may be fitted in place in the ventral direction. A metal wire mesh may be provided on opposed surfaces of the body for the ingrowth of tissue and ribs may be provided to enhance lateral stability.

Claims

1. A metallic intervertebral prosthesis for an arthodesis comprising a disk-like body having a width less than the height thereof and tapering conically from the ventral to dorsal for fitting between a pair of vertebrae to replace an intervertebral disk and having a plurality of fishplates extending from opposite sides thereof, each said fishplate having an opening for passage of a bone screw into an adjacent vertebrae.

2. An intervertebral prosthesis as set forth in claim 1 which further comprises a structure disposed on opposite surfaces of said body for an ingrowth of bone tissue.

3. An intervertebral prosthesis as set forth in claim 1 wherein said body has a raised rib on each of two opposite surfaces to enhance lateral stability thereof.

4. An intervertebral prosthesis as set forth in claim 3 wherein said rib has a cross-section of cylindrical segment shape.

5. An intervertebral prosthesis as set forth in claim 4 wherein said rib is of chevron-shape.

6. An intervertebral prosthesis for an arthodesis comprising a solid disk-like body having a less width than the height thereof and tapering conically from ventral to dorsal for fitting between a pair of vertebrae to replace an intervertebral disk, said body having a plurality of integral fishplates extending perpendicularly from a ventral side thereof, each fishplate having an opening for passage of a bone screw into an adjacent vertebrae.

7. An intervertebral prosthesis as set forth in claim 6 which further comprises a structure disposed on opposite surfaces of said body for an ingrowth of bone tissue.

8. An intervertebral prosthesis as set forth in claim 7 wherein said body has a raised rib on each of two opposite surfaces to enhance lateral stability thereof.

9. A metallic intervertebral prosthesis for an arthodesis comprising a disk-like body of kidney shape having a width less than the height thereof and tapering conically from the ventral to dorsal for fitting between a pair of vertebrae to replace an intervertebral disk and having a plurality of fishplates extending from opposite sides thereof, each side fishplate having an opening for passage of a bone screw into an adjacent vertebrae.

10. A metallic intervertebral prosthesis for an arthodesis comprising a disk-like body having a width less than the height thereof and tapering conically from the ventral to dorsal for fitting between a pair of vertebrae to replace an intervertebral disk and having a plurality of fishplates extending from opposite sides thereof, each said fishplate having an opening for passage of a bone screw into an adjacent vertebrae, and a wire mesh disposed on opposite surfaces of said body for an ingrowth of bone tissue.