Patent ID: 7537615

Claim:
An intervertebral disk prosthesis comprising: first and second parts intended to be attached respectively to two adjacent vertebrae, an intermediate part inserted between the first and second parts and comprising articular surfaces that cooperate with respective articular surfaces of the first and second parts, and means for coupling the first part and the intermediate part, wherein the coupling means are arranged to leave the intermediate part free relative to the first part during a first phase of a tilting movement of the first part relative to the second part, such that the intermediate part is displaced toward an end of the prosthesis that is opposite to an end toward which the first part is displaced by tilting relative to the second part, and to drive the intermediate part with the first part during a second phase of the tilting movement, said tilting movement being in the same direction in the second phase as in the first phase, wherein the first and second parts when placed in the vertebrae are not in abutment during said second phase.