Patent ID: 8337560

Claim:
An intervertebral disk prosthesis, comprising: a rigid top plate having an inner surface; a rigid bottom plate having an inner surface; and an elastically deformable intermediate cushion housed between the inner surfaces of the top and bottom plates, wherein the cushion, at rest, possesses a wedge-shape possessing at least one front notch having opposing faces that open into a larger end of the wedge and one rear notch having opposing faces that open into a narrower end, the faces of the notches co-operating by contact over an area of magnitude that varies as a function of the intensity and/or direction of a load to which the prosthesis is subjected, the notches having bottoms, the bottoms of the notches being spaced apart (D) from each other and being situated in a narrower half of the prosthesis, wherein the faces of the front notch define portions in relief that are interleaved.