Locking bone plates with controlled locking screw misalignment

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/17 (2006.01)

Patent

CA 2646828

A bone plate system for fixing bone fractures includes a locking bone plate (2) and a conicalIy- shaped drilling sleeve (15). The bone plate has at least one threaded hole (3), and with the drilling sleeve screwed into the bone plate hole, a drill bit (7) guided through the sleeve drills a hole into bone having a central axis angularly misaligned with the central axis of the bone plate hole. The angle between the drilled hole's central axis and the bone plate hole's central axis is equal to or less than the tolerance angle of the threads of the bone plate hole. This allows a bone plate screw (6) to be imperfectly seated with respect to the bone plate hole and still screwed into the hole to lock the plate without jamming the screw head into the plate hole, while still allowing the screw to be screwed out if needed.

La présente invention concerne un système de plaque vissée servant à la réparation des fractures osseuses. Il comprend une plaque vissée bloquante (2) et un manchon de fraisage (15) de forme conique. La plaque vissée comporte au moins un trou fileté (3), et avec le manchon de fraisage vissé dans le trou de la plaque vissée, un foret (7) guidé dans le manchon perce un trou pénétrant dans l'os selon un axe central angulairement désaligné par rapport à l'axe central du trou de la plaque vissée. L'angle formé entre l'axe central du trou fraisé et l'axe central du trou de la plaque vissé est égal ou inférieur à l'angle des tolérances des filets du trou de la plaque vissée. Cela permet d'avoir une vis (6) de plaque vissée imparfaitement placée par rapport au trou de la plaque vissée et pourtant vissée dans le trou de façon à bloquer la plaque sans coincer la tête de vis dans le trou de plaque, tout en autorisant un dévissage de la vis en cas de besoin.

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