Intervertebral disc prosthesis with transversally arched, curved cylindrical articulation surfaces for the lumbar and cervical spine

摘要

An intervertebral disc prosthesis for the total replacement of an intervertebral disc within the lumbar and cervical spine is disclosed. The intervertebral disc prosthesis comprises articulating sliding partners, wherein the upper sliding partner is adapted for a firm assembly to an upper vertebral body and the lower sliding partner is adapted for a firm assembly to a lower vertebral body. The functional two part design provides a dorsoventral motion and in the transversal plane a rotational motion around a fictitious vertical axis as a result of a laterolaterally aimed, transversally arched, ventrally curved cylindrical convexity and corresponding concavity but prevents an inclination of the sliding partners in a lateral direction. According to the invention, the intervertebral disk prostheses are suited for implantation from lateral and ventrolateral, particularly in revision surgeries.

主权项

1. Intervertebral disc prosthesis for total replacement of an intervertebral disc within a lumbar and cervical spine, comprising a first sliding partner and a second sliding partner which are adapted to firmly assemble to either an upper or lower vertebral body and, wherein said first and second sliding partners articulate with each other via a sliding area located between the sliding partners, and wherein
a) the first sliding partner has at a side opposite of a side for assembly with said upper or lower vertebral body a convexity, and the convexity correlates to a segment of a cylinder along its longitudinal axis laterally from right to left with a transversal ventrally directed arched curvature, wherein the convexity is surrounded dorsally, ventrally and laterally at both sides by an edge, and b) the second sliding partner has at an opposite side of the side for the assembly with the upper or lower vertebral body a concavity and the concavity corresponds to the convexity of the first sliding partner, wherein the concavity is surrounded dorsally, ventrally and laterally at both sides by an edge, and c) the edges of the first and second sliding partners have an outwardly opening aperture angle towards each other, wherein no inclination of the sliding partners towards each other is possible in a lateral direction, and a maximal possible motion of the sliding partners in dorsoventral direction is limited by a gap-closure of the edges of the first and second sliding partners, and d) the rotation of the first and second sliding partners towards each other is limited by a tolerance between the convexity and concavity laterally right and left of the sliding area.