Joint prosthesis enabling rotary circumduction

Details Joint prosthesis enabling rotary circumduction Joint prosthesis enabling rotary circumduction

A - Human Necessities

61

F

A61F 2/30 (2006.01) A61F 2/42 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2173581

A joint prosthesis is provided for replacing a joint between two bones in which one bone is normally permitted a substantial degree of rotary circumduction with respect to a second bone. A first member of the prosthesis is provided with a coupling portion enabling it to be attached to the elongated bone and includes ahead having a generally saddle-shaped articulating surface facing away from the stem. The second member similarly has a connector adapted to connect the second member to the second bone, and has a head provided with a saddle-shaped articulating surface configured and sized to articulate with the saddle-shaped surface of the first member to enable one of the long bones to move in rotary circumduction with respect to the other. The saddle-shaped surfaces preferably are substantially congruent in shape.

Une prothèse articulaire est prévue pour remplacer une articulation entre deux os, dans laquelle un des os peut se déplacer selon un degré sensible de circumduction rotative par rapport au deuxième os. Un premier organe (12) de la prothèse est pourvu d'une partie de couplage assurant sa fixation à l'os allongé. Cet organe comprend, en outre, une tête présentant une surface d'articulation, généralement en forme de selle, orientée dans le sens opposé à la tige. De même, le deuxième organe (14) comporte un connecteur adapté pour raccorder le deuxième organe au deuxième os, ainsi qu'une tête pourvue d'une surface d'articulation, en forme de selle, dont la taille et la configuration facilitent son articulation avec la surface en forme de selle du premier organe, ce qui permet le déplacement en circumduction rotative de l'un des os longs par rapport à l'autre. De préférence, les surfaces en forme de selles ont des formes adaptées les unes aux autres.

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