Fracture fixation system

A - Human Necessities – 61 – B

Patent

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A61B 17/80 (2006.01)

Patent

CA 2552746

A fracture fixation system in which a plate is secured to stable bone and posts are inserted at varying angles into an unstable bone fragment by engaging in rotatable bearings which are fixedly secured in the plate when the posts are fully engaged in the bone fragment. The bearings are formed as truncated spherical members having a number of longitudinal slots extending partway along the length of the bearing to form petals which are expanded outwardly when the posts are advanced in the bearing to produce non-uniform distribution of forces between the bearing and the plate which generate force couples to resist angulation of the posts and loss of fracture fixation. Various other ways of producing non-uniform force distribution are described.

L'invention concerne un système de fixation de fracture dans lequel une plaque est fixée à un os stable et des pointes sont insérées au niveau d'angles différents dans un fragment osseux instable par contact avec des supports rotatifs solidement fixés à la plaque lorsque les pointes sont entièrement insérées dans le fragment osseux. Les supports sont formés tels des éléments sphériques tronqués présentant un certain nombre de fentes longitudinales s'étendant partiellement sur la longueur du support de manière à former des pétales s'étendant vers l'extérieur lorsque les pointes avancent sur le support afin d'obtenir une distribution non uniforme des forces entre le support et la plaque, générant des couples de force destinés à résister à l'angulation des pointes et à la perte de fixation de la fracture. L'invention concerne également différentes autres manières de générer une distribution non uniforme des forces.

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