Constrained acetabular liner
AssigneeZimmer Austin, Inc.
InventorErin M. Johnson
Life of this patent
Estimating the term…
Abstract
A prosthetic acetabular component for a hip joint that is inserted into a bone cavity of the natural acetabulum. The acetabular component consists of an articulating component and a constraining component. The articulating component has a hemispherical or dome shape that defines a hemispherical cavity for receiving a femoral ball of a femoral hip stem. The constraining component has a body that connects to the articulating component to capture the femoral ball within the cavity of the articulating component. A locking mechanism connects the constraining component to the articulating component.
Claims16
An acetabular component, comprising:
- an acetabular articulating component having a hemispherical shape and an inner surface forming at least a partial spherical cavity adapted to receive a femoral ball;
- an acetabular constraining component connected to the articulating component and having a spherical surface that is adjacent the inner surface to enlarge the spherical cavity to be more than a hemisphere to partially capture the femoral ball;
- and
- a locking mechanism formed on both the articulating and constraining components to removeably connect the constraining component to the articulating component;
- wherein constraining component has a semi-circular shape from a bottom view.
An acetabular prosthesis adapted to replace a portion of a natural acetabulum, the prosthesis comprising:
- an acetabular shell;
- an acetabular insert connectable to the shell and having an inner surface that forms a spherical cavity to articulate with a femoral ball;
- and
- a constraining component connectable to the insert, the constraining component having one side with a spherical surface that is continuous with the inner surface to enlarge the spherical cavity to be more than a hemisphere;
- wherein the constraining component is semi-circular and wedge shaped.
Dependencies are inferred from the claim text.