Patent ID: 7842088

Claim:
Intervertebral disc prosthesis for implantation between vertebrae of a spinal column comprising at least a first plate and a second plate articulated about each other, with curved articulation surfaces providing articulation of at least one of the plates and allowing to pivot or tilt the plates in relation to each other via rotation about, respectively, an axis substantially perpendicular to the plane of one of the plates and an axis substantially in the plane of one of the plates, and a core comprising at least one core stop, a plane surface, and one of the curved articulation surfaces, which curved articulation surface of the core has a vertex, and the first plate comprises another of the curved articulation surfaces, which curved articulation surface of the first plate has a mid-position of its center in relation to the core; the second plate comprises a plane surface, at least a portion of which co-operates with the plane surface of the core in order to allow a translation of the core in relation to the second plate in at least one direction perpendicular to the vertical axis of the spinal column and a rotation of the core in relation to the second plate at least about an axis perpendicular to the plane of the second plate; at least one osseous anchor that is interlockable with at least one of the plates and that is movable independently of the plate prior to interlocking with the plate; each of the plates comprises edges and a contact surface configured to be placed in contact with a vertebral plate of one of the vertebrae between which the prosthesis is intended to be implanted; the contact surface for each of the plates comprises a geometric center at equal distance from at least two diametrically opposite points located on the periphery of the plate; the geometric centers of each contact surface are off-set so that the plates are not vertically aligned; and the off-set of the geometrical centers of the contact surfaces off-sets the edges of the plates in at least one direction perpendicular to the vertical axis of the spinal column.