Patent ID: 8535379

Claim:
An artificial spinal disc, comprising: a pair of substantially parallel plates formed to occupy a space defined by vertebral endplates, each of said plates having parallel, straight peripheral edges extending in a first direction and partial, elliptical shape peripheral edges extending in a second direction, each of the plates including a plurality of spikes on a first surface and a concave trough formed on a second surface opposite of the first surface; and a mobile core having a circular perimeter shape, the mobile core including a core rim with opposing convex surfaces extending from opposite sides of the core rim, the mobile core disposed between the pair of plates and permitting the vertebral endplates to move relative to one another, wherein a diameter of the circular perimeter shape of the mobile core is greater than a distance between the parallel, straight peripheral edges of each of the plates, wherein the plurality of spikes on each of said plates extend substantially away from the mobile core and said convex surfaces are formed to integrally fit within the concave trough of at least one of the plates, wherein the core rim limits lateral movement of the mobile core relative to the plates.