Posterior stabilized knee system prosthetic devices employing diffusion-hardened surfaces
OwnerDean Hughes, Harsh Gupta +1inventors
InventorsDean Hughes, Harsh Gupta, Gordon Hunter
Life of this patent
Estimating the term…
Abstract
An orthopedic implant with a diffusion-hardened surface on non-load bearing areas of the implant for interaction with non-load bearing surfaces of a polymeric bio-compatible material, such as UHMWPE. The orthopedic implant is a posterior stabilized knee prosthetic and system where a coating of oxidized zirconium is formed in the cam of the femoral prosthetic for interaction with the central post of a polymeric tibial insert. The diffusion-hardened surface of the orthopedic implant provides a strengthened cam and reduction in wear in the central post of the polymeric tibial insert.
Claims20
A posterior stabilized knee prosthetic system comprising:
- a) a femoral component configured to be surgically implanted into a patient's femur, the femoral component having two condylar portions with a cam extending between the posterior end of the condylar portions, and the cam having a diffusion-hardened surface along a portion of the cam for adding strength and wear resistance to the contact zones of the cam;
- b) a tibial component configured to be surgically implanted into a patient's tibia;
- and
- c) a tibial insert having a proximal surface that is shaped to articulate against the femoral component, the insert having a distal surface that fits against the proximal surface of the tibial component, and the tibial component having a post for engaging the femoral component to provide posterior stabilization.
A prosthesis for implantation in a patient, comprising:
- a prosthesis body for implantation in the body, the prosthesis body having one or more load bearing surfaces and one or more non-load bearing surfaces,
- the load bearing surface on the prosthesis body being sized and shaped to engage or cooperate with a second load bearing surface on another prosthesis portion, said second load bearing surface being formed of an organic polymer or polymer-based composite,
- the non-load bearing surface on the prosthesis body being sized and shaped to engage or cooperate with a second non-load bearing surface on another prosthesis portion, said second non-load bearing surface being formed of an organic polymer or polymer-based composite,
- a diffusion-hardened coated surface on the bearing surface, and
- a diffusion-hardened coated surface on the non-load bearing surface.
A posterior stabilized knee prosthetic comprising:
- a femoral component configured to be surgically implanted into a patient's femur, the femoral component having two condylar portions with a cam extending between the posterior of the condylar portions, the cam having a having diffusion-hardened surface along a portion of its length for adding strength to the impact zones of the cam;
- wherein the condylar portions are shaped to articulate against a tibial insert having a post for engaging the femoral component to provide posterior stabilization.
Dependencies are inferred from the claim text.