Patent ID: 8308801
Filing Date: 2012-11-13
Classification: A61F

Abstract:
1. An intervertebral disc prosthesis for installation in a spinal column between a superior vertebral body and an inferior vertebral body, comprising: a first intervertebral plate for engaging one or both of the inferior vertebral endplate and the inferior ring apophysis of the superior vertebral body; a second intervertebral plate for engaging one or both of the superior vertebral endplate and the superior ring apophysis of the inferior vertebral body; a biaxial rolling-contact core located between the intervertebral plates, wherein the biaxial rolling-contact core includes a convex upper surface and a convex lower surface, wherein the convex upper surface is curved around a first axis and the convex lower surface is curved around a second axis that is rotated relative to the first axis, and wherein the biaxial rolling-contact core is capable of rolling translation relative to the first intervertebral plate along the convex upper surface and in a first direction, and rolling translation relative to the second intervertebral plate along the convex lower surface and in a second direction; and a first flexure, conformable to one of: i) the convex lower surface; or ii) the convex upper surface, the first flexure constraining the biaxial rolling-contact core to restrained rolling translation in a restrained rolling direction without sliding relative to the first and second intervertebral plates in the restrained rolling direction.