Method for producing a medical implant made of a...

A - Human Necessities – 61 – F

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A61F 2/36 (2006.01) C22C 14/00 (2006.01) C22F 1/18 (2006.01)

Patent

CA 2597249

The invention relates to a joint prosthesis with a shaft made of a titanium alloy. According to the invention, at least the shaft (10) is precision cast and has a centered cubical crystalline structure. A titanium allow with this crystalline structure (so-called ~-titanium alloy) has an advantageously low modulus of elasticity, which is well-adapted to the physiological requirements. In addition, the embodiment as a finished casting enables a complex shaping. Especially effective is an embodiment as a femoral prosthesis (1) for an artificial hip joint, which has a longitudinally extended shaft (10) with grooves (14) and sawtooth-like projections (15) for bone anchoring.

L'invention concerne une prothèse articulaire comprenant une tige en alliage de titane, cette prothèse étant caractérisée en ce qu'au moins la tige (10) est réalisée par un procédé de moulage de précision et en ce qu'elle présente une structure cristalline cubique centrale. Un alliage de titane présentant cette structure cristalline ("alliage de ß-titane") présente un module d'élasticité avantageusement faible qui est bien adapté aux exigences physiologiques. La réalisation par moulage en châssis permet en outre d'obtenir des formes complexes. Un mode de réalisation sous forme de prothèse fémorale (1) pour une articulation artificielle de la hanche est particulièrement adapté, cette prothèse comprenant une tige (10) allongée pourvue de rainures (14) et de parties saillantes en dents de scie (15) pour ancrer la prothèse dans l'os.

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