INTERVERTEBRAL PROSTHESIS FOR INTRODUCTION VIA POSTERIOR APPROACH

摘要

An intervertebral prosthesis for insertion by posterior approach, designed to be inserted in pairs between two vertebral bodies, said prosthesis consisting of a prosthesis body extending in a longitudinal direction of intervertebral insertion, including peripheral faces delimiting, on the inside, an inner space for receiving a bone substitute. The prosthesis includes a prosthesis body of which the lower and upper bearing faces have a convex profile having continuously variable convexity in the longitudinal direction. The invention is intended for the treatment of individuals suffering from disc degeneration in the thoracic or lumbar vertebrae.

主权项

1. An intersomatic prosthesis for introduction via posterior approach, designed to be introduced in pairs between two vertebral bodies, said prosthesis being composed of a prosthesis body extending along a longitudinal direction of intervertebral introduction, comprising peripheral faces internally delimiting an internal space intended to receive a bone substitute, said peripheral faces comprising:
two opposite lateral faces, respectively an external lateral face and an internal lateral face, said lateral face being parallel and longitudinally curved in the same direction with a concave internal lateral face and a convex external lateral face, and where the height of the internal lateral face is greater than the height of the external lateral face; two opposite bearing faces, respectively a lower bearing face and an upper bearing face, where each bearing face has an opening on the internal space; two opposite end faces, respectively an anterior end face and a posterior end face, said posterior end face having a flat in which are arranged gripping orifices intended to cooperate with a gripping system, and said anterior end face having a general shape of ogival pyramid with four convex sections, respectively an external lateral section continuously extending the external lateral face, an internal lateral section continuously extending the internal lateral face, a lower section continuously extending the lower bearing face and an upper section continuously extending the upper bearing face; and wherein: the lower bearing face has a convex posterior portion with a given radius of curvature, starting from the posterior end face and continuously extended by a convex serrated portion of a given radius of curvature and this serrated portion being extended by the lower section, where the lower section has a radius of curvature smaller than the respective radii of curvature of the posterior and serrated portions of the lower bearing face; the upper bearing face has a convex posterior portion of a given radius of curvature, starting from the posterior end face and continuously extended by a convex serrated portion of a given radius of curvature and this serrated portion being extended by the upper section, where the upper section has a radius of curvature smaller than the respective radii of curvature of the posterior and serrated portions of the upper bearing face.