Multi-axial bone attachment assembly

Details Multi-axial bone attachment assembly Multi-axial bone attachment assembly

A - Human Necessities

61

B

A61B 17/70 (2006.01)

Patent

CA 2572794

A posterior fixation system includes a saddle member and an anchoring member. The anchoring member anchors the saddle member to bone. The saddle member includes a pair of upright portions that define a channel. The saddle member further has a hole therethrough bounded by an inner wall, and the hole forms a lower opening in the saddle member. The lower opening in the saddle member may contain angular cutouts placed symmetrically about the axis of the saddle to increase the allowable angulation of the bone screw in relationship to the axis of the saddle. The channel is adapted to receive an orthopedic rod, and the hole in the saddle member is adapted to receive the anchoring member. The saddle member and the anchoring member can be coupled so as to allow multi- axial movement of the members.

L'invention concerne un système de fixation postérieur, qui comprend un élément de selle et un élément d'ancrage. L'élément d'ancrage ancre l'élément de selle à l'os. L'élément de selle comprend deux parties verticales délimitant un canal. L'élément de selle est en outre traversé d'un trou bordé d'une paroi interne, et le trou forme une ouverture inférieure dans l'élément de selle. L'ouverture inférieure ménagée dans la selle peut contenir des découpes angulaires placées symétriquement autour de l'axe de la selle afin d'augmenter l'angulation tolérable de la vis osseuse relativement à l'axe de la selle. Le canal est adapté pour recevoir une tige orthopédique et le trou pratiqué dans l'élément de selle est adapté pour recevoir l'élément d'ancrage. L'élément de selle et l'élément d'ancrage peuvent être couplés de façon à permettre un mouvement multiaxial des éléments.

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