Hip stem
AssigneeImperial Innovations Limited
InventorsAndrew Amis, Bidyut Pal
Life of this patent
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Abstract
A stem (100) for use in a joint prosthesis, such as a femoral stem for a hip joint prosthesis, the stem comprising: a solid central core (102); a proximal outer layer (127) disposed over a proximal portion (101a) of the central core, wherein the proximal outer layer comprises a set of longitudinal ribs (120), defining slots (130) there between; and a distal outer layer made of a deformable porous material disposed over a distal portion (101b) of the central core. The arrangement is such that the stem (100) can be made with a relatively large diameter yet without being excessively stiff, for cementless fixation in osteoporotic patients. The deformability of the distal outer layer also mitigates against the risk of intraoperative bone fractures.
Claims21
A stem for use in a joint prosthesis, the stem comprising:
- a solid central core;
- a proximal outer layer disposed over a proximal portion of the central core, wherein the proximal outer layer comprises a set of longitudinal ribs, defining slots there between;
- and
- a distal outer layer made of a deformable porous material disposed over a distal portion of the central core.
21-46. (canceled)
Dependencies are inferred from the claim text.