Anchored femoral dome
First Claim
1. An implant, engageable with a sculpted femoral head having a prepared channel therethrough, for use as a body joint element which comprises:
- a dome, shaped as a solid hemisphere, defining an outer hemispherical bearing surface terminating in a flat lower bone-engaging surface, said dome being formed with a hole, said flat surface of said dome for abutting against said femoral head, said flat surface being textured and having a plurality of spikes extending outwardly therefrom to hold said dome to said sculpted surface; and
an elongated compression bolt terminating at opposite first and second ends and insertable through said hole and through said prepared channel, said first end including engaging means for attachment to said dome, said second end adapted to be engageable with a fixation means coupled to said second end for holding said flat surface against said sculpted head.
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Accused Products
Abstract
A prosthetic implant for the head of a femur comprises a substantially hemispherical-shaped dome formed with a hole, and having a relatively flat surface, for abutting a sculpted femoral head having a channel prepared through the bone. A compression bolt is insertable through the hole in the dome and through the prepared channel, with the bolt having a first end engageable with the dome and a second end engageable with a nut and washer to hold the dome firmly in position on the femoral head. The hole in the dome is tapered, and the first end of the compression bolt is correspondingly tapered, for fixed engagement of the bolt with the dome. The dome may include anchoring spikes extending from the bottom surface for embedding the dome in the femoral head to secure the dome on the femoral head. In addition, the bottom surface of the dome is textured to prevent slipping, and skirts may also be provided to form a partial ball-shaped dome. A method is also disclosed for attaching the prosthetic implant to the head of the femur.
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Citations
12 Claims
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1. An implant, engageable with a sculpted femoral head having a prepared channel therethrough, for use as a body joint element which comprises:
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a dome, shaped as a solid hemisphere, defining an outer hemispherical bearing surface terminating in a flat lower bone-engaging surface, said dome being formed with a hole, said flat surface of said dome for abutting against said femoral head, said flat surface being textured and having a plurality of spikes extending outwardly therefrom to hold said dome to said sculpted surface; and an elongated compression bolt terminating at opposite first and second ends and insertable through said hole and through said prepared channel, said first end including engaging means for attachment to said dome, said second end adapted to be engageable with a fixation means coupled to said second end for holding said flat surface against said sculpted head. - View Dependent Claims (2, 3, 4)
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5. A prosthetic extension for the head of a femur which comprises:
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an elongated compression bolt terminating in opposite first and second ends, said bolt being adapted for insertion through a prepared channel in said femur with said first and second ends extending oppositely therefrom; a dome shaped as a solid hemisphere defining an outer hemispherical-shaped bearing surface terminating in a flat lower bone-engaging surface, said flat surface of said dome being engageable with said first end to position said dome over said femoral head, said flat surface being textured, said flat surface also being formed with a plurality of spikes extending outwardly from said flat surface, said spikes being embedable in said head of said femur to hold said dome on said head, said first end of said bolt including engaging means for attachment to said dome, said second end adapted to be engageable with a fixation means coupled to said second end for holding said flat surface against said sculpted surface. - View Dependent Claims (6, 7, 8, 9)
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10. A method for attaching a prosthetic extension to the femur which comprises the steps of:
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preparing a channel through the femur, said channel being oriented with an exit on the femoral head; sculpting the head of the femur to form an abutment substantially centered on said channel; engaging a dome shaped as a solid hemisphere defining an outer hemispherical bearing surface terminating in a flat lower bone-engaging surface with an elongated bolt having a first end and a second end to fixedly hold said dome on said first end; mounting a plurality of spikes on said flat surface of said dome; impacting said dome to embed said spikes in said femoral head for securing said dome to said femoral head; inserting said bolt through said channel to position the flat surface of said dome over said sculpted femoral head; and engaging an attachment with said second end to hold said dome into fixed engagement with said femoral head. - View Dependent Claims (11, 12)
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Specification