Patent ID: 8821576

Claim:
An intervertebral disk prosthesis for use in a vertebral column, comprising: a base plate; a top plate; a core between the base plate and the top plate and having a longitudinal axis extending from the base plate to the top plate, a first curved surface on a side facing the top plate, and a second curved surface on a side facing the base plate, wherein at least the first curved surface is located on a first body of the core; and an annular elastic member contacting an outer surface of the first body and spaced apart from the top plate, the elastic member being more elastically compressible than the first body, wherein the top plate has a curved section intersecting said longitudinal axis and in sliding engagement with the first curved surface of the core, and wherein the sliding engagement provides for rotational movement of the top plate substantially about said longitudinal axis, and for sliding movement to increase or decrease an angle formed between an axis of rotation of the top plate and said longitudinal axis.