Extended range of motion, constrained prosthetic hip-joint

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/32 (2006.01)

Patent

CA 2669179

A prosthetic hip-joint includes: a. a prosthetic acetabulum cup for implantation into a pelvis; b. a prosthetic femoral assembly which includes: i. a ball-shaped femoral head that during implantation becomes located within the cup; and ii. a femoral stem that is fixed at a first end to the head, and that has a second end distal from the first end which is adapted for implantation into a medullary canal of a femur; and c. a liner assembly adapted to be secured to the cup and is also adapted to receive and to constrain the head against dislocation. In one aspect the hip-joint permits the head to rotate through an angle which exceeds at least 153 degrees while concurrently constraining the head against dislocation. In another aspect the hip-joint constrains the head against dislocation by a preestablished amount of force which is adjustable during implantation thereof.

L'invention concerne une prothèse de hanche (20) qui comporte: une prothèse d'acetabulum (22) pour implantation dans un bassin (24); b. un ensemble prothèse fémorale (28) qui comporte: i. une tête fémorale en forme de balle (32) qui, pendant l'implantation, se place à l'intérieur de la cavité (22); et ii. une tige fémorale (34) fixée à une première extrémité (36) vers la tête (32), et ayant une seconde extrémité (38) à distance de la première extrémité (36) destinée à l'implantation dans un canal médullaire d'un fémur; et c. un ensemble garniture (26) destiné à être fixé à la cavité (22) et destiné à recevoir et à assujettir la tête (32) contre une luxation. Dans un aspect, la prothèse de hanche (20) permet à la tête (32) de tourner suivant un angle excédant au moins 153° tout en assujetissant simultanément la tête 32 contre une luxation. Dans un autre aspect, la prothèse de hanche (20) assujettit la tête (32) contre une luxation par une force préétablie que l'on peut régler au moment de l'implantation.

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