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US 10,383,745 B2Granted
Acetabular cup assembly for multiple bearing materials
AssigneeSmith & Nephew, Inc.
InventorsCharles Wayne Allen, Jason A. Capriotti, Michael A. Croxton, Roger William Frank Ashton, Justin M. Waugh, Jeffrey J. Shea, Sureshkumar Srinivasan, William L. Waltersdorff, Terry W. McLean
Life of this patent
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Abstract
A modular acetabular cup assembly for use with multiple bearing liners is disclosed. The acetabular cup assembly includes a shell having a tapered inner wall and two circumferential grooves. The shell may be used with polyethylene, ceramic, metal, and other types of liners.
Claims20
An acetabular cup system, comprising:
- a shell having a generally concave inner surface, an outer surface, an end face formed at an upper end of the shell, an apex formed at a lower end of the shell along a curved portion of the inner surface, and a central axis extending through the apex, wherein the inner surface comprises a plurality of scallops positioned adjacent the end face, a tapered wall extending from the scallops toward the apex, a protrusion inwardly extending away from an adjacent portion of a segment of the inner surface that is located below the tapered wall, and a groove that extends from the protrusion to the curved portion of the inner surface;
- wherein the shell is configured to receive each of a plurality of liners, the plurality of liners including:
- a polymer liner comprising a plurality of tabs sized and shaped to be received in the scallops, and a bump sized and shaped to be received in the groove;
- and
- a metal liner comprising a tapered outer surface;
- wherein, when the polymer liner is seated in the shell, each tab is received in a corresponding one of the scallops, the bump is received in the groove, and an interference fit is formed between the polymer liner and the shell, the interference fit including engagement of the bump with the groove;
- wherein, when the metal liner is seated in the shell, the tapered wall is engaged with the tapered outer surface to thereby retain the metal liner in the shell;
- and
- wherein the curved portion of the inner surface has a curved cross-section along a plane including the central axis.
6 more elements
An acetabular cup system, comprising:
- a shell having a generally concave inner surface, an outer surface, an end face formed at an upper end of the shell therefor along a curved portion of the inner surface, and a central axis extending through the apex, and an apex positioned at a lower end of the shell, wherein the inner surface comprises:
- a plurality of inwardly-facing scallops positioned adjacent the end face;
- a tapered wall extending from the plurality of inwardly-facing scallops toward the apex;
- a first groove and a second groove, the first groove and the second groove both positioned below the tapered surface;
- and
- a protrusion positioned between the first groove and the second groove, the protrusion being generally defined by a first wall and a second wall, the first wall further defining a portion of the first groove, the second wall further defining a portion of the second groove, the second groove extending to a curved portion of the inner surface, the curved portion of the inner surface having a curved cross-section along a plane including the central axis;
- wherein the shell is configured to receive each of a plurality of liners, the plurality of liners including:
- a polymer liner comprising a plurality of tabs sized and shaped to be received in the scallops, and a first bump sized and shaped to be received in the first groove and a second bump configured to be received in the second groove;
- and
- a metal liner comprising a tapered outer surface;
- wherein, when the polymer liner is seated in the shell, each tab is received in a corresponding one of the scallops, the first bump is received in the first groove, the second bump is received in the second groove, and an interference fit is formed between the polymer liner and the shell, the interference fit including engagement of the first bump with the first groove and engagement of the second bump with the second groove;
- and
- wherein, when the metal liner is seated in the shell, the tapered wall is engaged with the tapered outer surface to thereby retain the metal liner in the shell.
10 more elements
Dependencies are inferred from the claim text.