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US 5,609,646 AGranted
Acetabular cup for a total hip prosthesis
AssigneeHowmedica International Inc.
InventorsRichard E. Field, Peter Nuijten, Neil Rushton
Life of this patent
Estimating the term…
Abstract
An acetabular cup for a total hip prosthesis has an outer shell and an inner bearing component. The shell is molded around the inner bearing component and has an elastic modulus similar to subchondral bone of between 5 GPa and 18 GPa. The shell has a part-spherical main portion and two independent arms projecting from the part-spherical main portion. The arms are separated from each other by an opening of predetermined shape and size.
Claims12
An acetabular cup for a total hip prosthesis comprising:
- an inner bearing component;
- and
- an outer shell mechanically coupled to said inner bearing component, said shell having been formed from chopped carbon fiber reinforced plastic by molding around the inner bearing component and having an elastic modulus similar to subchondral bone of between 5.6 GPa and 18.6 GPa, with said inner bearing component having a lower elastic modulus and said shell having a part-spherical main portion and two independent arms separated from each other and projecting from said main portion forming an opening, each of said arms terminating at end portions adjacent said opening and opposite said main portion, each of said end portions having an aperture formed therethrough for receiving a fixation means to fix said arms to the natural acetabulum and a plurability of spikes extending from said main portion of said shell on a portion thereof adjacent to a central portion of said opening.
Dependencies are inferred from the claim text.