Acetabular cup conversion ring
AssigneeZimmer, Inc.
InventorsArchie W. Newsome, Randy L. Schlemmer, Erin M. Johnson, Richard A. Berger
Life of this patent
Estimating the term…
Abstract
An acetabular implant for hip replacement surgery includes a shell component and first and second alternative bearing components interchangeably engageable with the shell component to provide a choice in bearing components. The shell component has a shell component engagement mechanism suitable for engaging the first alternative bearing component. A conversion ring is also engageable with the shell component, so that a shell component/conversion ring assembly provides a second shell component engagement mechanism suitable for engagement with the second alternative bearing component.
Claims20
An acetabular prosthesis comprising:
- a shell component having a convex external surface shaped for engagement with an acetabulum and a concave interior surface defining an internal cavity, said interior surface including an annular groove;
- a first bearing component having a convex external surface and a concave internal surface, said external surface defining an annular projection configured for receipt within said annular groove of said shell component in mating snap-fit engagement;
- a conversion ring having a sidewall defining an outer surface and a tapered inner surface, said sidewall extending axially from a first end to a second end, said outer surface defining an annular projection configured for receipt within said annular groove of said shell component in mating snap-fit engagement;
- and
- a second bearing component having a tapered external surface and a concave internal surface, said external surface configured to releasably engage said tapered internal surface of said conversion ring in mating taper-fit engagement.
A kit of acetabular components for assembling an acetabular joint prosthesis including a shell component and a bearing component disposed in the shell component, the kit comprising:
- a shell component having an external surface shaped for engagement with an acetabulum and an internal cavity, said cavity including a shell component engagement mechanism;
- a first bearing component having an external surface, said external surface defining a complimentary first bearing engagement mechanism engageable with said shell component engagement mechanism;
- a conversion ring having a sidewall defining an outer surface and an inner surface and extending axially from a first end to a second end, said outer surface defining a complimentary outer ring engagement mechanism releasably engageable with said shell component engagement mechanism, said inner surface defining an inner ring engagement mechanism;
- a second bearing component having an external surface, said external surface defining a complimentary second bearing engagement mechanism releasably engageable with said inner ring engagement mechanism, such that said conversion ring is insertable into said shell component to convert said shell component from a first shell/bearing engagement mechanism to a second shell/bearing engagement mechanism, said first and second shell/bearing engagement mechanisms being of different types selected from the group consisting of snap-fit, press-fit, taper-fit, and threaded-fit engagement mechanisms.
Dependencies are inferred from the claim text.