Patent ID: 8152850

Claim:
An intervertebral disc prosthesis for insertion into an intervertebral disc compartment which is formed between a first vertebra and a second vertebra, the prosthesis comprising: a) a first constituent element which comprises a first supporting plate, in which, on one side, a recess is formed and which has an annular flat region surrounding the recess and abutting against the first vertebra when the intervertebral disc prosthesis is inserted into the intervertebral disc compartment, comprises an insert which is received in the recess and which has a convexly curved region having at least substantially the shape of a ramp, and comprises a first joint member arranged on an opposite side of the first supporting plate, and b) a second constituent element which comprises a second supporting plate, in which, on one side, an abutment face is formed which abuts against the second vertebra when the intervertebral disc prosthesis is inserted into the intervertebral disc compartment, and comprises a second joint member arranged on an opposite side of the second supporting plate, wherein the convexly curved region has a long dimension in a first direction and a short dimension in a second direction orthogonal to the first direction, wherein the convexly curved region comprises, in a cross section perpendicular to the first direction, a first inclined section having a first incline and a second inclined section having a second incline smaller than the first incline, and wherein the convexly curved region has, in a cross section perpendicular to the second direction, a substantially horizontal section centered between two inclined third sections.