Intervertebral Disc Prosthesis and Instrumentation for Insertion of the Prosthesis between the Vertebrae

Abstract

The present invention relates to an intervertebral disc prosthesis and insertion instrumentation, the prosthesis comprising at least first and second osseous anchoring means, the first osseous anchoring means disposed proximal to the periphery of the plate on which it is situated and the second osseous anchoring means being offset along the antero-posterior axis, the second osseous anchoring means comprising a basal portion and a sharp-edged portion of width narrower than the basal portion. The instrumentation comprises a rod fitted with at least two feet forming a clip and sliding in a tube, sliding the rod in the tube, in the direction of the manipulation end, causing closing of the clip by contact between the exterior of the feet and a truncated portion of the tube and sliding the rod in the tube, in the direction of the prehension end, causing opening of the clip by contact between an axis and the interior of the feet of the rod.

1 . An intervertebral disc prosthesis for implantation between vertebrae of a spinal column comprising:
 a first plate and a second plate each comprising a peripheral plate edge and a vertebral contact surface configured to contact a vertebral plate of a vertebra, the vertebral contact surface of at least one of the first plate or the second plate having an antero-posterior axis and comprising a first osseous anchoring means disposed proximal to the peripheral plate edge, and   a curved plate articulation surface disposed on at least one of the first plate or the second plate to allow pivoting or inclination of the first plate and the second plate relative to one another by rotation about, respectively, an axis substantially perpendicular to the plane of the first plate or the second plate and an axis substantially in the plane of the first plate or the second plate.   
     
     
         2 . Instrumentation for inserting an intervertebral disc prosthesis between vertebrae of a spinal column comprising:
 a hollow tube having a manipulation end and a prehension end, the manipulation end having plural contact surfaces and a separation axis;   a rod slidably disposed at least partially in the tube and having a manipulation end, a prehension end, a longitudinal axis, and a width;   an axis of rotation attached to the rod proximal to the prehension end of the rod; and   feet rotatable about the axis of rotation, the feet collectively forming a clip for grasping the intervertebral disc prosthesis, the clip having a width exceeding the width of the rod and having external feet surfaces and internal feet surfaces;   in which sliding the rod in the tube in the direction of the manipulation end of the tube causes closing of the clip by contact between the exterior feet surfaces of the clip and the contact surfaces of the tube; and   sliding the rod in the tube in the direction of the prehension end causes opening of the clip by contact between the separation axis of the tube and the interior feet surfaces.