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US 4,842,605 AGranted
Hip prosthesis
AssigneeS.N.R. Roulements
InventorsClaude Sonnerat, Andre Brunet
Life of this patent
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Abstract
The invention has as its object an improved hip prosthesis in which the femoral prosthesis oscillates around a pin inclined approximately 20.degree. to the horizontal, characterized by the fact that this oscillation is provided inside the head of the femoral prosthesis by a double bearing comprising a row of rollers to support the radial loads and, a row of balls to support the axial loads.
Claims6
A hip prosthesis comprising:
- a femoral member adapted to be implanted in a femur and an integral pin member extending from a proximal end of said femoral member at approximately an angle of 20 degrees to the horizontal;
- a joint head adapted to engage an acetabulum and rotatably connected to said pin so as to oscillate around said pin, said joint head comprising a substantially cylindrical bore defining a circumferential side wall and a bottom end wall;
- and
- a substantially cylindrical shell having a circumferentially outer wall and an outer end wall configured to engage said bore of the joint head and an inner bore to be affixed to said pin;
- and
- first bearings positioned between said circumferential outer wall of said shell and said circumferential side wall of said joint head, said first bearings comprising means for supporting said joint head for rotation about said pin and for supporting radial loads to said joint head;
- and
- second bearings positioned between said outer end wall of said shell and said bottom end wall of said joint head, said second bearings comprising means for supporting said joint head for rotation about said pin and for supporting the axial load to said joint head.
5 more elements
Dependencies are inferred from the claim text.