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US 5,800,559 AGranted
Coated femoral stem prosthesis
AssigneeHowmedica, Inc.
InventorsPaul A. Higham, Larry T. Warfield
Life of this patent
Estimating the term…
Abstract
A femoral hip component for use in hip arthroplasty has a stem portion for contact with bone cement. The stem portion is formed from a biocompatible material having a surface finish of less than about four microinches. This surface is coated with a uniform layer of material selected from the group consisting of diamond-like carbon, chromium carbide, titanium nitride, titanium carbo-nitride, chromium and zirconium and a combination thereof.
Claims7
A femoral hip joint prosthesis having reduced adhesion to bone cement comprising:
- a proximal stem portion;
- and
- a distal stem portion for contact exclusively with bone cement lining a bone cavity, said distal stem being formed from metal having a polished surface finish coated with a discrete layer of diamond-like carbon to reduce adhesion to bone cement, said layer of diamond-like carbon being from about 1 to 30 microns thick with an outer surface maintaining said polished surface finish.
A femoral hip prosthesis having reduced adhesion to bone cement comprising:
- a head and neck proximal portion;
- and
- an elongated stem portion for contact exclusively with bone cement lining a bone cavity extending from said proximal portion to a distal end, said stem having a medial, lateral, anterior and posterior surfaces, said surfaces tapering downwardly from said proximal portion to said distal end, said stem being formed from metal having a polished surface finish coated with a discrete layer of diamond-like carbon to reduce adhesion to bone cement, said layer of material is from about 1 to 3 microns thick with an outer surface maintaining said polished surface finish.
Dependencies are inferred from the claim text.