INTERVERTEBRAL DISK ARTHROPLASTY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an intervertebral disk arthroplasty device having fatigue strength with a biocompatible material, eliminating or reducing the load of a facet joint and applicable to 90%. SOLUTION: The disk arthroplasty device 110 is disposed in place of an intervertebral disk. The device is implantable into a resected disk space and is provided with a ball member 146 and a socket member 126 and shaped to provide lateral bending and backward extension of up to about 5°and forward flexion of up to about 15°. Metal insert cups are provided and attached to the surface of the device to assume convex shape along one axis to conform to the natural contours of the top and bottom vertebra surfaces. Metal insert cups provide tensile support to a structure and provide for the attachment of additional structures for retaining the device in position after implantation into the disk space. COPYRIGHT: (C)2004,JPO