Dual mobility acetabular implant for hip revision surgery
AssigneesSmith & Nephew, Inc., Smith & Nephew Orthopaedics AG, Smith & Nephew Asia Pacific Pte. Limited
InventorDavid W. Rister
Life of this patent
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Abstract
An insert arranged and configured for use in a dual mobility acetabular implant is disclosed. The insert includes a plurality of chamfers arranged and configured to contact the femoral neck and/or head of a hip implant. The insert includes a plurality of chamfers such as, for example, two or three chamfers to define a plurality of differently arranged contact surfaces for contacting the femoral component to accommodate a variety of different femoral component configurations and/or impingement conditions in order to reduce contact stress between the insert and the femoral component.
Claims15
A dual mobility acetabular implant comprising:
- an acetabular cup arranged and configured to be positioned within a patient’s acetabulum, the acetabular cup including a body having an interior cavity;
- a liner arranged and configured to be inserted into the interior cavity of the acetabular cup, the liner including a body having an interior cavity;
- and
- an insert arranged and configured to be inserted into the interior cavity of the liner, the insert including a body extending from an annular rim to a polar end, the body including an interior cavity, a convex exterior surface arranged and configured to articulate relative to an inner surface of the interior cavity of the liner, and a concave interior surface arranged and configured to receive and articulate relative to an outer surface of a femoral head;
- wherein the annular rim of the insert includes a plurality of chamfers defining multiple contact surfaces for contacting a portion of a femoral neck;
- and
- wherein the insert comprises a sharp edge defined at an intersection of the annular rim and the interior surface.
A dual mobility acetabular implant comprising:
- an acetabular cup arranged and configured to be positioned within a patient’s acetabulum, the acetabular cup including a body having an interior cavity;
- a liner arranged and configured to be inserted into the interior cavity of the acetabular cup, the liner including a body having an interior cavity;
- and
- an insert arranged and configured to be inserted into the interior cavity of the liner, the insert including a body extending from an annular rim to a polar end, the body including an interior cavity, a convex exterior surface arranged and configured to articulate relative to an inner surface of the interior cavity of the liner, and a concave interior surface arranged and configured to receive and articulate relative to an outer surface of a femoral head;
- wherein the annular rim of the insert includes a plurality of chamfers defining multiple contact surfaces for contacting a portion of a femoral neck, the annular rim defining multiple diameters including a first diameter at a first end thereof and a second diameter adjacent to a cylindrical opening leading to the interior cavity of the body of the insert, the second diameter being smaller than the first diameter;
- and
- wherein a transition between the annular rim and the inner surface of the interior cavity, adjacent the cylindrical opening, defines a non-tangential intersection forming a sharp edge.
Dependencies are inferred from the claim text.