Systems and methods for vertebral disc replacement

A - Human Necessities – 61 – F

Patent

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A61F 2/44 (2006.01) A61F 2/46 (2006.01)

Patent

CA 2703237

The present invention provides artificial disc prostheses, methods and instrumentation for implantation and revision. Each prosthesis may comprise superior and inferior end plates and a nucleus positioned between articular surfaces of the end plates. The end plates may have planar bone engagement surfaces with a plurality of self-cutting teeth. The articular surfaces of the end plates may be planar or include a flattened portion. The nucleus includes superior and inferior articular surfaces which may comprise flattened portions such that when the articular surfaces of the nucleus and the end plates are placed in a preferred orientation, the flattened and/or planar portions are aligned. Each prosthesis may provide flexion/extension, anterior/posterior translation, lateral bending, and/or axial rotation degrees of freedom. One embodiment comprises a prosthesis with a first joint providing flexion/extension and anterior/posterior translation, and a second joint providing lateral bending and axial rotation.

La présente invention concerne des prosthèses discales artificielles ainsi que des procédés et des instruments d'implantation et de révision. Chaque prosthèse peut comprendre un plateau supérieur et un plateau inférieur ainsi qu'un noyau positionné entre les surfaces articulaires des plateaux. Les plateaux peuvent avoir des surfaces planaires de pénétration dans l'os comprenant une pluralité de dents auto-coupantes. Les surfaces articulaires des plateaux peuvent être planaires ou inclure une partie aplatie. Le noyau se compose d'une surface articulaire supérieure et d'une surface articulaire inférieure qui peuvent comprendre des parties aplaties de sorte que, lorsque les surfaces articulaires du noyau et des plateaux sont placées dans une orientation préférée, les parties aplaties et/ou planaires sont alignées. Chaque prosthèse peut fournir des degrés de liberté en flexion/extension, en translation antérieure/postérieure, en flexion latérale et/ou en rotation axiale. Un mode de réalisation comprend une prosthèse avec une première articulation assurant flexion/extension et translation antérieure/postérieure ainsi qu'une seconde articulation assurant flexion latérale et rotation axiale.

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