Patent ID: 7833273
Filing Date: 2010-11-16
Classification: A61F

Abstract:
1. Intervertebral disc prosthesis for total replacement of an intervertebral disc of a lumbar and cervical spine, comprising an upper sliding partner adapted to firmly assembles to an upper vertebral body, a lower sliding partner adapted to firmly assembles to a lower vertebral body, and located between the upper and lower sliding partner, a middle sliding partner, wherein said sliding partners articulate with each other via an upper sliding area between the middle and upper sliding partners and a lower sliding area between the middle and lower sliding partners, wherein a) the middle sliding partner has an upper and lower surface each having a convexity wherein a radius of curvature for each of the convexities: b) the upper and lower sliding partner have insides with concavities each defined by a corresponding recess to the convexity of the upper and lower surface of the middle sliding partner, each of these concavities being enclosed by a surrounding edge, and c) the surrounding edges of the upper and lower sliding partners, which extend between an outer rim and the convexity/concavity define, upon assembly, an outwardly opening aperture angle, with d) a motion angle is greater in a dorsoventral direction than in a laterolateral direction, resulting from the different radii of curvature defined by the first and second circle, and