Articulating disc implant
AssigneeSynthes USA, LLC
InventorsMarc Reichen, Kurt Schmura
Life of this patent
Estimating the term…
Abstract
An intervertebral disc implant for use in the spine including a first part (10) and a second part (20), wherein the first part and second part are configured as a joint prosthesis for the spine. The first part includes one of a concave or convex articulating surface (16) and the second part includes one of the other concave or convex articulating surface (26). One of the concave or convex articulating surfaces is preferably elliptically shaped in at least one direction and does not match and is different than one of the other concave or convex articulating surfaces.
Claims25
An intervertebral implant for insertion between a first and a second vertebrae, the implant comprising:
- an upper part including an upper surface sized and configured to contact an end plate of the first vertebra;
- a lower part including a lower surface sized and configured to contact an end plate of the second vertebra;
- a convex articulating surface operatively associated with one of the upper and lower parts and having a first radius of curvature in a first direction;
- and
- a concave articulating surface operatively associated with the other one of the upper and lower parts so that the upper part is moveable with respect to the lower part, and the concave articulating surface has a first radius of curvature in the first direction;
- wherein the first radius of curvature of the convex articulating surface is different than the first radius of curvature of the concave articulating surface in the same first direction.
An intervertebral implant for insertion between a first and a second vertebrae, the implant comprising:
- an upper part including an upper surface sized and configured to contact an end plate of the first vertebra;
- a lower part including a lower surface sized and configured to contact an end plate of a second vertebra;
- a convex articulating surface operatively associated with one of the upper and lower parts;
- and
- a concave articulating surface operatively associated with the other one of the upper and lower parts so that the upper part is moveable with respect to the lower part,
- wherein the concave articulating surface has a different shape than and does not match with the convex articulating surface such that the entire concave articulating surface does not contact the convex articulating surface and the concave articulating surface rolls on the convex articulating surface in at least one direction whereby the axis of rotation of the concave articulating surface moves along the convex articulating surface.
An intervertebral implant comprising:
- an upper part including an upper surface sized and configured to contact an end plate of an upper vertebra;
- a lower part including a lower surface sized and configured to contact an end plate of a lower vertebra;
- a convex articulating surface operatively associated with one of the upper and lower parts;
- a concave articulating surface operatively associated with the other one of the upper and lower parts so that the upper part is moveable with respect to the lower part;
- wherein one of the concave and convex articulating surfaces is elliptically shaped with a radius of curvature that varies in at least one direction and the other of the concave and convex surfaces is partially spherically shaped having a constant radius of curvature in the same at least one direction.
Dependencies are inferred from the claim text.