A surgical screw system and related methods

Details A surgical screw system and related methods A surgical screw system and related methods

A - Human Necessities

61

B

A61B 17/70 (2006.01) A61B 17/56 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2423973

A surgical screw system (50) for use with implantation rods (8) includes a screw member (1), a receiver member (3), a pressure cap (7) and a locking device (11). The screw member has a shaft (15) and a head (14) with a spherical undersurface (24) and a conical tapered recess (10). The receiver member has an upper (3a) and lower (3b) portion, a u-shaped rod receiving channel (12) and an axial bore (16). The u-shaped channel has two lateral legs (12a, 12b) at the upper portion and forms an opening leading to the axial bore. The axial bore near the lower portion includes an inwardly conical tapered surface (5) which has a diameter larger than the shaft of the screw member but smaller than the head of the screw member. The conical surface forms a support upon which the spherical undersurface of the head of the screw member rests when the screw member is guided through the bore of the lower portion of the receiver member. The pressure cap is positioned within the axial bore and situated upon the head of the screw member. The locking device is designed for securing the rod within the u-shaped channel of the receiver member by applying a tightening torque upon the rod when positioned within the opening and the bore near the upper portion of the receiver member.

L'invention concerne un ensemble vis chirurgicale (50) utilisable avec des tiges (8) d'implantation comprend un élément vis (1), un élément récepteur (3), un capuchon de pression (7) et un dispositif de verrouillage (11). L'élément vis est doté d'un arbre (15) et d'une tête (14) présentant une surface inférieure sphérique (24) et un évidement conique (10). L'élément récepteur présente une partie supérieure (3a) et une partie inférieure (3b), un canal (12) de réception de tige en U et un alésage axial (16). Le canal en U est pourvu de deux pieds (12a, 12b) latéraux à la partie supérieure et forme une ouverture conduisant à l'alésage axial. L'alésage axial à proximité de la partie inférieure comprend une surface conique (5) vers l'intérieur dont le diamètre est supérieur à celui de l'arbre de l'élément vis, mais inférieur à celui de la tête de ce dernier. La surface conique forme un support sur lequel repose la surface inférieure sphérique de la tête de l'élément vis lorsque celui-ci traverse l'alésage de la partie inférieure de l'élément récepteur. Le capuchon de pression est placé à l'intérieur de l'alésage axial et au-dessus de la tête de l'élément vis. Le dispositif de verrouillage est conçu pour assurer la tige à l'intérieur du canal en U de l'élément récepteur par application d'un couple de vissage sur la tige lorsqu'elle est placée dans l'ouverture et l'alésage à proximité de la partie supérieure de l'élément récepteur.

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