Patent ID: 8821577

Claim:
An intervertebral disk prosthesis ( 4 ), comprising: a rigid top plate ( 5 ); a rigid bottom plate ( 6 ); and an elastically-compressible continuous intermediate cushion ( 7 ) received between two inside surfaces of the plates ( 5 , 6 ), the intermediate cushion comprises two portions and a thin zone connecting the two portions, the thin zone forms a folding hinge so that the two portions can fold onto the other, wherein the folding hinge becomes a posterior end of the prosthesis; wherein the prosthesis is subdivided in a thickness direction into two units resting one on the other via complementary contact surfaces, and wherein the prosthesis includes a contention membrane ( 8 ) for the cushion ( 7 ), which membrane is secured to the plates ( 5 , 6 ).