A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/56 (2006.01) A61B 17/70 (2006.01) A61B 17/86 (2006.01)
Patent
CA 2125030
A spinal implant (10) that has a rod (40) that connects and stabilizes the vertebrae of a vertebral column. The implant (10) has screws (16) that are attached to the vertebrae. Each screw (16) has a clamp (26) with a first bore (28) that allows the clamp (26) to be placed over the screw (16). The first bore (28) of the clamp (26) is larger than the major diameter of the screw (16), so that the clamp (26) can float about the Screws (16). The clamps (26) each have a second bore (34) perpendicular to the first bore (28), adapted to receive and hold the rod (40). Integrally formed with the second bore (34) of each clamp (26) are a pair of flanges (46, 48). When the flanges (46, 48) are deflected inward, the clamp (26) "grabs" the rod (40). The clamp (26) is placed on a hexagonally shaped shoulder (64) of the screw ( 16). A nut (50a) is fastened onto the opposite side of the clamp, such that the flanges (46, 48) are pressed between the shoulder (60) and the nut (50a). The diameter of the second bore (34) and rod (40) are approximately the same so that a small deflection of the flanges (46, 48) produces a large clamping force on the rod (40).
L'invention se rapporte à un implant spinal (10) qui comprend une tige (40) servant à relier et à stabiliser les vertèbres de la colonne vertébrale du sujet. Cet implant (10) comporte des vis (16) qui sont fixées auxdites vertèbres. Chaque vis (16) possède une pince (26) présentant un premier trou (28) permettant de placer la pince (26) sur la vis (16). Le premier trou de la pince (26) a un diamètre supérieur au plus grand diamètre de la vis (16), pour que la pince (26) puisse flotter autour des vis (16). Les pinces (26) possèdent chacune un second trou (34) perpendiculaire au premier (28) et destiné à recevoir et à retenir la tige (40). On prévoit une paire de brides (46, 48) qui sont conçues solidaires au second trou (34) de chacune des pinces (26). Lorsque ces brides (46, 48) sont fléchies vers l'intérieur, la pince (26) pince la tige (40). La pince (26) est placée sur un épaulement hexagonal (60) de la vis (16). Un écrou (50a) est fixé sur le côté opposé de la pince, pour que les brides (46, 48) soient prises en sandwich entre l'épaulement (60) et l'écrou (50a). Le diamètre du second trou (34) et le diamètre de la tige (40) sont approximativement identiques pour qu'une petite flexion des brides (46, 48) produise une grande force de serrage sur la tige (40).
Baker Gregg S.
Hafeli Paul B.
Artifex Ltd.
Riches Mckenzie & Herbert Llp
LandOfFree
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