Patent ID: 7963994
Filing Date: 2011-06-21
Classification: A61F

Abstract:
1. An intervertebral disk prosthesis for use in the vertebral column, comprising: a base plate; a top plate; a core arranged in between the base plate and the top plate and being in contact with the base plate and the top plate, wherein the core has a curved surface on a side facing the top plate and a curved surface on a side facing the base plate, the curved surfaces forming sliding faces; the top plate having a curved section in sliding engagement with the curved surface of the core facing the top plate; the base plate having a curved section in sliding engagement with the curved surface of the core facing the base plate; wherein the core comprises an upper body defining the curved surface on the side facing the top plate, a lower body defining the curved surface on the side facing the base plate and an annular intermediate elastic body between and separating the upper and lower bodies to provide cushioning for the prosthesis; wherein the sliding engagements provide for respective rotational movement of the top plate and the base plate substantially about a central axis of the core extending from the upper body to the lower body, and respective sliding movement of the top plate and the base plate with respect to the core from first positions where respective axes of rotation of the top plate and the base plate form first angles with the central axis of the core to second positions where the respective axes of rotation of the top plate and the base plate form second angles with the central axis of the core; wherein the intermediate elastic body is configured to extend primarily in a plane generally perpendicular to the vertebral column; and wherein the prosthesis is configured to replace the vertebral disk.