Patent ID: 9445915
Filing Date: 2016-09-20
CPC Classification: A61F

Claim Text:
1. An intervertebral disc prosthesis the prosthesis comprising: an upper plate comprising an upper vertebral contact surface; a lower plate comprising a lower vertebral contact surface; a core having a length and a transverse width between opposite lateral edges, the core comprising a lower core-facing surface disposed on the upper plate on a side opposite the upper vertebral contact surface, the lower core-facing surface comprising a protrusion bearing a concave sliding surface having a length that is less that the length of the upper convex sliding surface; an upper core-facing surface disposed on the lower plate on a side opposite the lower vertebral contact surface, the upper core-facing surface comprising a generally planar upper sliding surface that is sized to permit translational movement of the core in the direction of its length and the direction of its width and rotation of the core about an axis perpendicular to the generally planar upper sliding surface; a first pair of protrusions extending from the upper core-facing surface proximal to a first edge of the lower plate, the first pair of protrusions spaced apart a distance greater than the width of the first tab; and a second pair of protrusions extending from the upper core-facing surface proximal to a second edge of the lower plate on the opposite side of the lower plate from the first edge of the lower plate, the second pair of protrusions spaced apart a distance greater than the width of the second tab.