INTERVERTEBRAL CAGE AND METHOD OF USE

• US 20020055781A1
• Filed: 12/23/1999
• Published: 05/09/2002
• Est. Priority Date: 12/23/1999
• Status: Active Grant

• Current Assignee: Depuy Acromed Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Acromed Incorporated (Johnson & Johnson)
• Inventors: SAZY, JOHN A.
• Granted Patent: US 6,648,915 B2
• Time in Patent Office: Days
• US Class Current: 623/17.11
• CPC Class Codes: A61B 17/701 Longitudinal elements with a non-circular, e.g. rectangular, cross-section A61B17/7005, A61B17/7007 take precedence
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• 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 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• 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 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30308 banana-shaped
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2230/0015 Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0063 Three-dimensional shapes
• 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: Y10S 623/902 Method of implanting

Abstract

An intervertebral prosthesis for implantation between adjacent vertebrae of the human spine is shown. The prosthesis is formed as a unitary cage body configured and sized to be inserted between adjacent vertebrae in a single step implantation procedure. The cage body is banana shaped as viewed from above, the body having an exterior surface and an interior surface, the interior surface defining an internal recess for receiving cancellous bone material during an implantation procedure. The cage body can be formed as an interlinked mesh.

Claims

1. An intervertebral prosthesis for implantation between adjacent vertebrae of the human spine, comprising:

a unitary body configured and sized to be inserted between adjacent vertebrae in a single step implantation procedure;

wherein the unitary body is banana shaped as viewed from above, the body having an exterior surface and an interior surface, the interior surface defining an internal recess for receiving cancellous bone material during an implantation procedure.

2. An intervertebral prosthesis for implantation between adjacent vertebrae of a human spine, comprising:

a unitary cage body configured and sized to be inserted between adjacent vertebrae in a single step implantation procedure;

wherein the cage body is banana shaped as viewed from above, the body having an exterior surface and an interior surface, the interior surface defining an internal recess for receiving cancellous bone material during an implantation procedure; and

wherein the cage body forms an interlinked mesh.

3. The intervertebral prosthesis of claim 2, wherein the cage body is selectively sized to fit within a vertebral disk space of a human anatomy allowing adequate space for additional cancellous bone anterior to the cage body within the disk space.

4. The intervertebral prosthesis of claim 2, wherein the cage body is a of metal having evenly spaced openings about a circumference of the body.

5. The intervertebral prosthesis of claim 4, wherein the cage body is formed of a hard metal alloy.

6. The intervertebral prosthesis of claim 5, wherein the cage body is formed of a titanium alloy.

7. A method for providing vertebral inter-body fusion in the vertebral column, the method comprising the steps of:

preparing a space for receiving an orthopedic prosthetic device between two vertebrae;

surgically inserting a unitary cage body into the space between the vertebrae, wherein the cage body is banana shaped as viewed from above, the body having an exterior surface and an interior surface, the interior surface defining an internal recess for receiving cancellous bone material during the implantation procedure and wherein the cage body forms an interlinked mesh.

8. The method of claim 7, wherein the cage body is selectively sized to fit within a vertebral disk space of a human anatomy allowing adequate space for additional cancellous bone anterior to the cage body within the disk space.

9. The method of claim 8, wherein the cage body is a ring of metal having evenly spaced openings about a circumference of the body.

10. The method of claim 9, wherein the cage body is formed of a hard metal alloy.

11. The method of claim 10, wherein the cage body is formed of a titanium alloy.