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US 2016/0095707 A1Published application
Application of diffusion hardened material
AssigneeSmith & Nephew, Inc.
InventorsJason Sean Jordan, Vivek Devidas Pawar, Mark Ellsworth Nadzadi
Life of this patent
Estimating the term…
Abstract
An implant having components comprising an oxidized zirconium bearing surface adapted to decrease pain, lower friction, and minimize wear when coupled with natural femoral articular cartilage. The implant components also provide for reduced backside wear effects in fixed and mobile implants. The implant components further provide for more ideal wear coupling between components in mobile bearing implants.
Claims21
-15. (canceled)
A medical implant, comprising:
- a shell having an interior surface;
- a liner having an inner surface and an outer surface, the outer surface positioned in contact with the interior surface of the shell;
- a head coupled to a stem, the head having an exterior surface positioned in contact with the inner surface of the liner;
- wherein at least a portion of at least one of the interior surface of the shell, the inner and outer surfaces of the liner, and the exterior surface of the head comprises:
- a diffusion hardened zone;
- and
- a substantially defect-free ceramic layer overlaying the diffusion hardened zone, wherein the ceramic layer has a thickness of about 0.1 to 25 microns and the diffusion hardened zone has a thickness of greater than 2 microns.
4 more elements
A medical implant, comprising:
- a shell, a liner, a head portion, and a stem portion extending from the head portion, at least one of the liner and the head portion having a first bearing surface defining a first radius, and at least one of the shell and the liner including a second portion having a second bearing surface defining a second radius;
- wherein the first bearing surface is configured to contact the second bearing surface, and wherein a maximum ratio between the first radius and the second radius is 1:1.05;
- and
- wherein a portion of each of the first and second bearing surfaces comprises:
- a diffusion hardened zone in contact with a substrate;
- a substantially defect-free ceramic layer overlaying the diffusion hardened zone, wherein the ceramic layer has a thickness of about 0.1 to 25 microns and the diffusion hardened zone has a thickness of greater than 2 microns.
3 more elements
A medical implant, comprising:
- a shell component having a first surface;
- a head component coupled to a stem component, the head component having a second surface;
- and
- an insert configured to be interposed between the shell component and the head component, the insert having a third surface and a fourth surface;
- wherein the first surface is configured to be in generally opposing facing relation with the third surface, and wherein the first surface is configured to articulate against the third surface;
- wherein the second surface is configured to be in generally opposing facing relation with the fourth surface;
- wherein a portion of each of the first, second, third, and fourth surfaces comprises:
- a diffusion hardened zone in contact with a substrate;
- a substantially defect-free ceramic layer overlaying the diffusion hardened zone, wherein the ceramic layer has a thickness of about 0.1 to 25 microns and the diffusion hardened zone has a thickness of greater than 2 microns.
6 more elements
Dependencies are inferred from the claim text.