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US 5,443,519 AGranted
Prosthetic ellipsoidal acetabular cup
AssigneeImplex Corporation
InventorsRobert G. Averill, Robert C. Cohen
Life of this patent
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AssigneeImplex Corporation
InventorsRobert G. Averill, Robert C. Cohen
Estimating the term…
An acetabular cup prosthetic device comprised of an outer shell component and a inner bearing insert and the method of implanting the acetabular cup prosthetic within a patient. The outer surface of the shell component for the present invention acetabular cup has a plurality of regions which conform to the curvature of at least one ellipsoid. To implant the shell component, the acetabulum of a patient is spherically reamed to a size slightly smaller than that of the outer surface of the shell component. As the shell component is inserted into the spherically shaped acetabulum, the interior surface of the acetabular cavity deforms to assume a substantially ellipsoidal curvature, producing an interference fit between the rim region of the shell component and the upper peripheral rim region of the acetabulum. The remaining surface regions of the acetabulum conform substantially to the ellipsoidal shape or shapes defined by the remaining surface regions of the shell component so that surface contact is established without the development of ejection forces therebetween.
A prosthetic acetabular cup having an outer surface for insertion into a patient's acetabulum, wherein said outer surface includes at least one ellipsoidally shaped region that defines an elliptical plane section having a major axis and a minor axis, wherein said major axis is longer than said minor axis.
A prosthetic acetabular cup comprising:
A prosthetic acetabular cup comprising:
A prosthetic acetabular cup having an outer surface for implantation into a patient's acetabulum that includes at least one groove and a plurality of ribs extending from said outer surface, said at least one groove having a generally dovetailed-shaped cross-sectional profile, said at least one groove having side walls defined by said ribs, whereby bone from said acetabulum can grow within said at least one groove and is mechanically retained by the dovetail shape of said at least one groove, and wherein said outer surface further includes at least one ellipsoidally shaped region that defines an elliptical plane section having a major axis and a minor axis, said major axis being longer than said minor axis.
Dependencies are inferred from the claim text.