Shape-memory coupling especially for spinal fixator

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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Details

F16B 1/02 (2006.01) A61B 17/70 (2006.01) F16B 4/00 (2006.01) F16B 7/04 (2006.01) F16B 23/00 (2006.01) F16L 21/08 (2006.01)

Patent

CA 2371394

An advanced coupling device (16) using shape-memory technology. The coupling device (16) includes a coupling element (18) defining a longitudinal passage ex-tending therethrough, the passage bounded by a side wall (42) having a first end (42a) and an opposing second end (42b), the side wall (42) defining a first slot (62a) extending from the first end (42a) toward the second end (42b), and a second slot (62b) extending from the second end (42b) toward the first end (42a), and wherein a portion of the second slot (62b) is positioned proximately adjacent and longitudinally overlapping a portion of the first slot (62a). The device (16) further includes at least one compression element (20) at least par-tially formed of a shape-memory material and being disposed about at least a portion of the coupling element (18). The compression element (20) has a configuration which contracts about the coupling element (18) and compresses the side wall (42) against a member (12) disposed within the passage to limit movement of the member (12) relative to the coupling element (18).

L'invention concerne un dispositif de couplage perfectionné (16) à mémoire de forme, qui comprend un élément de couplage (18) définissant un passage d'extension longitudinale, ce passage étant bordé d'une paroi latérale (42), laquelle comporte une première extrémité (42a) et une seconde extrémité opposée (42b); la paroi latérale (42) définit une première fente (62a) qui s'étend de la première extrémité (42a) à la seconde (42b), et une seconde fente (62b) qui s'étend de la seconde extrémité (42b) à la première (42a), sachant qu'une partie de la seconde fente (62b) est en position rapprochée adjacente et chevauche longitudinalement une partie de la première fente (62a). Le dispositif (16) comprend en outre au moins un élément de compression (20) au moins en partie constitué de matériau à mémoire de forme et placé autour d'au moins une partie de l'élément de couplage (18). L'élément de compression (20) a une configuration qui se contracte autour de l'élément de couplage (18) et comprime la paroi latérale (42) contre une pièce (12) placée dans le passage, pour limiter le mouvement de la pièce (12) par rapport à l'élément de couplage (18).

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