Patent ID: 6802863
Filing Date: 2004-10-12
Classification: A61F

Abstract:
A prosthetic nucleus replacement for implanting within an annulus fibrosis in one part of a human spine, comprising:a domed body comprised of ceramic material formed into a rounded shape, and having a complex convex upper side for contacting and articulating with an end-plate cartilage of a supported superior vertebrae; a receptacle disposed in an inferior surface of the domed body; a base having a top surface that matches the receptacle and provides for mechanical attachment to the domed body, and comprised substantially of a biocompatible porous coated metal material; a keel disposed in the base and protruding from a bottom surface and providing for an immobile foundation on an underlying inferior vertebrae; wherein, a top surface of the domed body slides easily when in contact with said supported superior vertebrae; and wherein, the keel and said porous coated metal material provide a firm mechanical interface and make possible bone in-growth from said inferior vertebrae and permanent anchoring.