Patent ID: 8313529

Claim:
An intervertebral implant for mounting between a superior vertebra and an inferior vertebra, the intervertebral implant comprising: a first endplate having a first leading end, a first trailing end, a first lateral side, a second lateral side, a first vertebra engagement surface and a first inner surface, the first vertebra engagement surface mounted to the superior vertebra in an implanted position; a second endplate having a second leading end, a second trailing end, a third lateral side, a fourth lateral side, a second vertebra engagement surface and a second inner surface, the second vertebra engagement surface mounted to the inferior vertebra in the implanted position; and an inlay mounted to and between the first and second inner surfaces in an assembled configuration, the inlay including a first mounting plate, a second mounting plate, a first W-shaped spring and a second W-shaped spring discrete from the first W-shaped spring, the first and second W-shaped springs mounted between the first and second mounting plates on opposite sides of an insertion axis, the first and second W-shaped springs having respective leading ends, trailing ends, and central axes that extend from the leading ends to the trailing ends, wherein the central axes are oriented generally parallel to the insertion axis.