Dynamic screw system

A - Human Necessities – 61 – B

Patent

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Details

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

Patent

CA 2696788

A dynamic screw system for stabilizing a vertebral body includes a bone screw adapted to connect to the vertebral body, the bone screw including an open concave head, a connecting element coupled to the bone screw, a joint element coupled around a middle cylindrical portion of the connecting element, an elongated bar element coupled to the upper spherical portion of the connecting element, and a pin adapted to fit inside the elongated bar element and a slot of the connecting element. The connecting element may include an upper spherical portion including a first diameter, a middle cylindrical portion including a second diameter less than the first diameter, and a lower spherical portion having a plurality of outwardly expandable legs adapted to lock into the open concave head of the bone screw.

L'invention concerne un système de vis dynamique pour stabiliser un corps vertébral, qui comprend une vis à os conçue pour se connecter au corps vertébral, la vis à os comprenant une tête concave ouverte, un élément de connexion couplé à la vis à os, un élément d'articulation couplé autour d'une partie cylindrique médiane de l'élément de connexion, un élément formé d'une barre allongée couplé à la portion sphérique de l'élément de connexion, et une cheville conçue pour s'ajuster à l'intérieur de l'élément de barre allongée et dans une fente de l'élément de liaison. L'élément de connexion peut comprendre une partie sphérique supérieure possédant un premier diamètre, une portion cylindrique médiane avec un second diamètre qui est inférieur au premier diamètre, et une partie sphérique inférieure qui comporte une pluralité de pattes extensibles vers l'extérieur conçues pour se bloquer dans la tête concave ouverte de la vis à os.

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