Bone stabilization system including multi-directional...

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/30 (2006.01)

Patent

CA 2647067

A bone fixation system includes a plate and a set of fixation locking screws. The plate defines a set of locking screw holes each having an internal thread. Each respective locking screw has a head with an external structure that is adapted to self-tap into the internal thread of a given locking screw hole to secure the respective first-type fixation locking screw at an surgeon- directed angle relative to the plate. This angle is defined during forcible insertion and rotation of the respective locking screw into the given screw hole. The system may also include unidirectional locking screws. In a preferred embodiment the plate and first-type of screw are made of different metals, with the plate made of titanium alloy and the screw made of cobalt chrome alloy.

Le système de fixation d'os faisant l'objet de cette invention inclut une plaque et un jeu de vis de blocage pour fixation. La plaque définit un jeu de trous de vis de blocage ayant chacun un filetage interne. Chaque vis de blocage respective comporte une tête dont la structure externe est conçue pour se loger d'elle-même dans le filetage interne d'un trou de vis de blocage donné, de façon à fixer le premier type respectif de vis de blocage pour fixation selon un angle voulu par le chirurgien par rapport à la plaque. Cet angle est défini durant l'insertion et la rotation forcées de la vis de blocage respective dans le trou de vis donné. Le système peut également inclure des vis de blocage unidirectionnelles. Dans un mode de réalisation préféré, la plaque et le premier type de vis sont faits de métaux différents, la plaque étant constituée d'un alliage de titane et la vis étant constituée d'un alliage de cobalt et de chrome.

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