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US 7,044,974 B2Granted
Hip prosthesis with a modular acetabular cup assembly
AssigneeZimmer Technology, Inc.
InventorsFrank D. Garber, John P. Hom
Life of this patent
Estimating the term…
Abstract
An acetabular cup assembly includes a shell component, a liner component, and means for retaining the liner in the shell including a spherical profile thread spiraling around a portion of each of the shell and liner.
Claims12
A hip prosthesis comprising:
- an acetabular liner including a hemispherical convex back and a face opposite the hemispherical convex back, the hemispherical convex back defining a polar region, a concave bearing surface extending into the liner through the face toward the polar region, a screw thread spiraling around a portion of the hemispherical convex back, the screw thread having a thread crest and a thread root, the thread crest following a spherical profile as it spirals around the hemispherical convex back toward the polar region;
- and
- an acetabular shell including a hemispherical cavity for receiving the convex back the hemispherical cavity having a polar region, a screw thread spiraling around a portion of the cavity, the screw thread having a thread root following a spherical profile as it spirals around the cavity toward the polar region, the thread root being engageable with the thread crest of the liner screw thread.
A hip prosthesis comprising:
- an acetabular liner including a hemispherical convex back and a face opposite the hemispherical convex back, the hemispherical convex back defining a polar region, a concave bearing surface extending into the liner through the face toward the polar region, a screw thread spiraling around a portion of the convex back, the screw thread having a thread crest and a thread root, the thread root following a spherical profile as it spirals around the hemispherical convex back toward the polar region;
- and
- an acetabular shell including a hemispherical cavity for receiving the hemispherical convex back, a screw thread spiraling around a portion of the cavity, the hemispherical cavity having a polar region, the screw thread having a thread crest following a spherical profile as it spirals around the cavity toward the polar region, the thread crest being engageable with the thread root of the liner screw thread.
Dependencies are inferred from the claim text.