Device for fixation of bone fractures

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/86 (2006.01) A61B 17/88 (2006.01)

Patent

CA 2693395

A device and method for fixation of fractures having a screw (10) comprising a shank with an end portion on the outer surface of which a thread (12) is configured, and comprising a through bore. The through bore comprises two' bore portions differing in diameter (16, 17). The step (18) in the diameter between the these bore portions is arranged adjoining the end of the screw having the thread. This step in diameter can support a insert (30, 50) which in turn supports a polymer pin (20, 40) when the latter is pressurized in the screw. Together with an applied ultrasonic vibration the pressure fluidizes the polymer pin and presses the material through holes configured in the wall of the screw.

L'invention porte sur un dispositif et un procédé de fixation de fractures, lequel dispositif comprend une vis (10) comportant une tige munie d'une partie d'extrémité sur la surface extérieure de laquelle est configuré un filetage (12), et comportant un alésage traversant. L'alésage traversant comprend deux parties d'alésage de diamètre différent (16, 17). Le saut de diamètre (18) entre les deux parties d'alésage précitées est agencé de façon qu'il est adjacent à l'extrémité de la vis munie du filetage. Ce saut de diamètre peut soutenir une pièce rapportée (30, 50) qui soutient à son tour une broche en polymère (20, 40) lorsque cette dernière est mise sous pression dans la vis. La pression, conjointement à l'application d'une vibration ultrasonore, fluidifie la broche en polymère et comprime le matériau à travers des trous ménagés dans la paroi de la vis.

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