Endoprosthetic bone joint devices
AssigneeBTG International Limited
InventorJohn Christian Tracey Church
Life of this patent
Estimating the term…
Abstract
An endoprosthetic acetabular component of overall cup form is improved by the provision of an outer part (100; 300; 500) for securement to bone and a plurality of inner parts (200; 400; 600) individually selectively interconnectable with the outer part in like manner but providing a dished articulating surface (203; 403; 603) in respectively different predetermined positions varying in depth and/or inclination. The interconnection is preferably rotatably adjustable relative to the cup mouth, suitably by the provision of mutually complementary indented/detented surface formations (104,202; 304,402; 505,607) on the parts. The outer part may also be selectable from a range adapted to respectively different manners of securement to bone.
Claims32
A prosthesis assembly for replacement of an acetabulum, comprising:
- a supply including a plurality of bearing elements;
- an outer member having an external surface adapted for securement to bone and an internal engagement surface shaped to receive a bearing element selected from said supply of bearing elements;
- each bearing element having an exterior engagement surface for engagement with said internal engagement surface of said outer member;
- each bearing element having an interior surface shaped to engage a femoral head in a non-captive manner;
- and
- each bearing element having a rim surface, the rim surface of each bearing element having a different form from the rim surface of another bearing element of the supply.
A prosthetic joint system, comprising:
- a femoral head;
- an outer member having an external surface adapted for securement to bone and an internal engagement surface shaped to receive a bearing element selected from a supply of bearing elements;
- each bearing element having an exterior engagement surface for engagement with said internal engagement surface of said outer member;
- each bearing element having an interior surface shaped to engage the femoral head in a non-captive manner;
- and
- each bearing element having a rim surface, the rim surface of each bearing element having a different form from the rim surface of another bearing element of the supply.
A method for replacing an acetabulum in hip joint surgery, comprising:
- providing an outer member having an internal engagement surface adapted to engage an exterior surface of a bearing element;
- providing a supply of bearing elements suitable for engagement with said outer member, each bearing element of said supply having an interior surface shaped to engage with a femoral head in a non-captive manner, and each bearing element in said supply having a rim surface, the rim surface of each bearing element having a different form from the rim surface of another bearing element of the supply;
- securing said outer member to a patient's bone;
- selecting a bearing element from said supply deemed to best suit the patient;
- and
- fixing said selected bearing element into said outer member.
A method for implanting a prosthetic joint system, comprising:
- providing a femoral head;
- providing an outer member having an internal engagement surface adapted to engage an exterior surface of a bearing element;
- providing a supply of bearing elements suitable for engagement with said outer member, each bearing element of said supply having an interior surface shaped to engage with said femoral head in a non-captive manner, and each bearing element in said supply having a rim surface, the rim surface of each bearing element having a different form from the rim surface of another bearing element of the supply;
- securing said outer member to a patient's bone;
- selecting a bearing element from said supply deemed to best suit the patient;
- fixing said selected bearing element into said outer member;
- and
- engaging the femoral head with said selected bearing element.
Dependencies are inferred from the claim text.