Patent ID: 8057547
Filing Date: 2011-11-15
Classification: A61B,A61F

Abstract:
1. An artificial intervertebral disc for implantation between adjacent superior and inferior vertebrae of a spine, the disc comprising: a superior shell, an inferior shell, and a means for biasing the superior and inferior shells apart; the superior and inferior shells being moveable with respect to each other over two or more articulating surfaces; the inferior shell having a superior surface comprising a posteriorly positioned convex portion; the superior shell having an inferior surface opposing the superior surface of said inferior shell, and comprising a posteriorly positioned concave portion, opposite said convex portion; the convex and concave portions being in articulating cooperation to form a ball and socket joint; at least one of the convex or concave portions having a male portion and the other of the convex or concave portions having a cooperating female portion adapted to receive and positively engage said male portion.