Threaded washer

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/68 (2006.01) A61B 17/00 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2242479

A threaded washer (1) with a central bore (5) for use with a bone screw (60) is disclosed. The threaded washer (1) is threaded into a counterbore extending below the bone surface and into cancellous bone material. The external washer threads (9) are tapered to provide improved purchase. The bone screw (60) is inserted through the central bore of the threaded washer (I) and threaded into the fragment beyond the fracture. The threaded washer (1) provides improved compressive forces while permitting the bone screw' head (67) to be located beneath the bone surface.

On décrit une rondelle filetée (1) présentant un alésage central (5), et utile avec une vis (60) pour ostéosynthèse. Cette rondelle (1) est vissée dans un contre-alésage s'étendant sous la surface de l'os et dans le tissu osseux spongieux. Les filetages extérieurs (9) de la rondelle sont coniques, afin de constituer un meilleur point d'appui. On introduit la vis d'ostéosynthèse (60) dans l'alésage central de la rondelle filetée (1), puis on la visse dans le fragment situé au-delà de la fracture. Cette rondelle filetée (1) offre des forces de compression améliorées tout en permettant à la tête (67) de la vis d'ostéosynthèse d'être située sous la surface de l'os.

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