Intervertebral disc prosthesis

Patent metadata

Field	Value
Publication number	US-9655739-B2
Application number	US-201414513818-A
Country	US
Kind code	B2
Filing date	Oct 14, 2014
Priority date	Feb 4, 2004
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

This disclosure relates to intervertebral disc prostheses which may have an upper plate, a lower plate, and a mobile core, with the upper surface of the core being in contact with at least a part of the lower surface of the upper plate. In some configurations, limit stops reduce friction while limiting or preventing the movements of the core relative to the lower plate, in translation and in rotation, respectively, along an axis substantially parallel to the lower plate and about an axis substantially perpendicular to the lower plate. Instrumentation for insertion of the prostheses into intervertebral spaces is also described.

First claim

The invention claimed is:

1. A system for treatment of a spine comprising:
an intervertebral disc prosthesis for insertion between adjacent vertebrae comprising
a first plate having a curved articulation surface and a vertebral contact surface,
a second plate having a substantially flat articulation surface and a vertebral contact surface,
a core having a curved surface in contact with at least a part of the curved articulation surface of the first plate and a substantially flat surface in contact with at least a part of the substantially flat articulation surface of the second plate, the core displaceable in translation along an axis substantially parallel to the substantially flat articulation surface of the second plate and in rotation about an axis substantially perpendicular to the substantially flat articulation surface of the second plate, and
a plurality of limit stops each configured to limit translation and rotation of the core, each limit stop comprising a contact plate disposed proximal to a lateral edge of the second plate and a cooperating recess disposed along a lateral edge of the core;

a clip configured to hold the prosthesis during insertion of the prosthesis between adjacent vertebrae comprising
a first lateral clip edge and a second lateral clip edge,
a front surface having a form complementary to a form of a front edge of the prosthesis,
with the clip having a loaded configuration in which the prosthesis is disposed between the first lateral clip edge and the second lateral clip edge with one lateral edge of the second plate in contact with the first lateral clip edge, an opposite lateral edge of the second plate in contact with the second lateral clip edge, and the front edge of the prosthesis in contact with the front surface of the clip; and

an insertion instrument body comprising
a head sized to accept the clip in the loaded configuration,
a rod attachable to the clip and movable between a first position in which the clip is retracted at least partially in the head and a second position in which the clip is extended at least partially from the head,
a rod stop configured to limit movement of the rod and,
an internal wall of the head sized to compress the first lateral clip edge and the second lateral clip edge against the prosthesis with the clip retracted at least partially in the head.

2. The system according to claim 1 in which the prosthesis has an insertion direction, and comprises vertebral anchors having teeth oriented to oppose displacement of the prosthesis in a direction opposite the insertion direction.

3. The system according to claim 1 in which a biocompatible coating is disposed on the vertebral contact surfaces of the first and second plates.

4. The system according to claim 1 in which the vertebral contact surface of the first plate is at least partially bulged, and the vertebral contact surface of the second plate is substantially flat.

5. The system according to claim 1 in which the core has a channel formed in the substantially flat surface of the core.

6. The system according to claim 5 in which the channel is a groove.

7. The system according to claim 1 in which each of the first lateral clip edge and the second lateral clip edge comprises a flexible blade.

8. The system according to claim 7 in which the front surface of the clip has a first height, the front edge of the prosthesis has a second height, and the first height and the second height are substantially equal.

9. The system according to claim 8 in which the front surface of the clip has a first longitudinal face, a second longitudinal face, and a median longitudinal face, and, with the clip in the loaded configuration, the first longitudinal face contacts a front edge of the first plate, the second longitudinal face contacts a front edge of the second plate, and the median longitudinal face contacts a front edge of the core.

10. A system for treatment of a spine comprising:
an intervertebral disc prosthesis for insertion between adjacent vertebrae comprising
a first plate having a curved articulation surface and a vertebral contact surface,
a second plate having a substantially flat articulation surface and a vertebral contact surface,
a core having a curved surface in contact with at least a part of the curved articulation surface of the first plate and a substantially flat surface in contact with at least a part of the substantially flat articulation surface of the second plate, the core displaceable in translation along an axis substantially parallel to the substantially flat articulation surface of the second plate and in rotation about an axis substantially perpendicular to the substantially flat articulation surface of the second plate, and
a limit stop configured to limit translation and rotation of the core comprising a contact plate disposed proximal to a lateral edge of the second plate and a cooperating recess disposed along a lateral edge of the core;

a clip configured to hold the prosthesis during insertion of the prosthesis between adjacent vertebrae comprising a first lateral clip edge and a second lateral clip edge, with the clip having a loaded configuration in which the prosthesis is disposed between the first lateral clip edge and the second lateral clip edge with one lateral edge of the second plate in contact with the first lateral clip edge and an opposite lateral edge of the second plate in contact with the second lateral clip edge; and
an insertion instrument body comprising a head sized configured to accept the clip in the loaded configuration.

11. The system according to claim 10 in which the vertebral contact surface of the first plate is at least partially bulged, and the vertebral contact surface of the second plate is substantially flat.

12. The system according to claim 10 in which the core has a channel formed in the substantially flat surface of the core.

13. The system according to claim 12 in which the channel is a groove.

14. The system according to claim 10 in which each of the first lateral clip edge and the second lateral clip edge comprises a flexible blade.

15. The system according to claim 10 in which the clip comprises a front surface having a form complementary to a form of a front edge of the prosthesis, the front surface of the clip has a first height, the front edge of the prosthesis has a second height, and the first height and the second height are substantially equal.

16. The system according to claim 15 in which the front surface of the clip has a first longitudinal face, a second longitudinal face, and a median longitudinal face, and, with the clip in the loaded configuration, the first longitudinal face contacts a front edge of the first plate, the second longitudinal face contacts a front edge of the second plate, and the median longitudinal face contacts a front edge of the core.

17. A system for treatment of a spine comprising:
an intervertebral disc prosthesis for insertion between adjacent vertebrae comprising
a first plate having a curved articulation surface and a vertebral contact surface,
a second plate having a substantially flat articulation surface and a vertebral contact surface,
a core having a curved surface in contact with at least a part of the curved articulation surface of the first plate and a substantially flat surface in contact with at least a part of the substantially flat articulation surface of the second plate, the core displaceable in translation along an axis substantially parallel to the substantially flat articulation surface of the second plate and in r

Assignees

• Ldr Medical

Inventors

• Hovorka Istvan
• Bernard Pierre

Classifications

• A61F2002/30476

  locked by an additional locking mechanism · CPC title

• A61F2002/30616

  Sets comprising a plurality of prosthetic parts of different sizes or orientations · CPC title

• A61F2002/443

  having two transversal endplates and at least one intermediate component · CPC title

• A61F2002/30369

  Limited lateral translation of the protrusion within a larger recess · CPC title

• A61F2002/30937

  with cut-outs · CPC title