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US 5,181,929 AGranted
Femoral prosthesis employing a small ceramic ball
AssigneeCeramiques Techniques Desmarquest
InventorsChristian Prats, Pierre Vivier
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Abstract
The disclosure relates to a femoral prosthesis consisting of a metal rod having a male frustoconical end portion and a femoral head, or ceramic ball, having a frustoconical blind recess, assembled by means of a conical sleeve fitment. The ceramic ball is formed of material having an improved flexion breakage modulus and an improved elasticity modulus.
Claims21
A femoral prosthesis comprising:
- a metal rod comprising a first end adapted to be implanted in a femur and a second frustoconical end having a total angle greater than 4.degree.,
- a ceramic femoral head comprising a substantially spherical body with an outer surface having a diameter which is not more than 26 mm and made of a ceramic material having a mean grain size not more than 1 micrometer, a 3 points flexion breakage modulus better than 920 MPa and an elastically modulus greater than 220 GPa,
- a blind-ended recess being provided in said body and comprising an inwardly converging frustoconical shaped recess having a total angle substantially the same as said total angle of said frustoconical end of said metal rod, said frustoconical shaped recess intersecting said outer surface of said body in a circle having an entrance diameter between about 8 and about 14 mm,
- said frustoconical end of said metal rod being force-fitted in said blind-ended recess.
1 more element
Dependencies are inferred from the claim text.