Bone plate and bone screw guide mechanism

Details Bone plate and bone screw guide mechanism Bone plate and bone screw guide mechanism

A - Human Necessities

61

B

A61B 17/80 (2006.01) A61B 17/16 (2006.01) A61B 17/17 (2006.01) A61B 17/88 (2006.01) A61B 17/70 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2311803

A bone plate (10) comprises a base plate (14) having at least two screw holes (18), and at least two bone screws (16) capable of securing the bone plate to a bone by insertion through the screw holes into the bone. The bone screws have heads (28) shaped to toggle within the screw holes. A retaining plate (20) is provided that is fixedly attachable to the base plate. The retaining plate covers at least a portion of each of the bone screws. The retaining plate, and base plate each contain set screw apertures (24, 26). A set screw (22) is provided to retain the retaining plate in place over the base plate by screwing the set screw through the set screw apertures in the retaining plate, and base plate. This design prevents the bone screw from backing out from the bone once screwed in through the base plate.

Une plaque à os (10) selon la présence invention se compose d'une plaque de base (14) présentant au moins deux trous de vis (18) et au moins deux vis à os (16) capables de fixer à un os la plaque à os par insertion dans l'os via les trous de vis. La forme de la tête (28) des vis à os est conçue pour permettre une inclinaison à l'intérieur des trous de vis. L'invention concerne également une plaque de retenue (20) pouvant de fixer de façon définitive à la plaque de base. La plaque de retenue recouvre au moins une partie de chacune des vis à os. La plaque de retenue et la plaque de base contiennent chacune des trous de vis de calage (24, 26). Une vis de calage (22) permet de maintenir en place la plaque de retenue sur la plaque de base en vissant la vis de calage via les orifices de vis de calage dans la plaque de retenue, et la plaque de base. Cette conception empêche la vis à os de ressortir de l'os une fois qu'elle a été vissée en position au travers de la plaque de base.

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