Multi-axis connections between spinal stabilizers and screws

A - Human Necessities – 61 – B

Patent

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A61B 17/70 (2006.01)

Patent

CA 2345042

A multi-axis correction washer for use with a spinal stabilizer for internal spinal fixation. The bodies of the washer are provided in cylindrical and wedge-shaped cylindrical configurations with a passage in the center of the longitudinal axis of the cylinder and/or offset from the center axis of the cylindrical washer and a shoulder or other structure for rotatably engaging a hole in a spinal implant. The spinal implant can be a plate and screw-type, ladder-type, or monorail-type spinal fixation system. The washer is rotated to provide an infinite range of angles and screw placements relative to the central axis of the spinal column for maximum flexibility of installation and to effectively transfer the load on the spinal column to the implant, all while maintaining an angle of approximately 90~ between the head of the screw and/or nut and the washer which engages the implant.

L'invention concerne une rondelle de correction à plusieurs axes destinée à être utilisée en association avec un stabilisateur vertébral en vue d'une fixation vertébrale interne. Les corps des rondelles, qui ont des configurations cylindriques et cunéiformes, comportent un passage situé au centre de l'axe longitudinal du cylindre et/ou décalé par rapport à l'axe médian de la rondelle cylindrique, et un épaulement ou autre structure permettant leur introduction par rotation dans un orifice ménagé dans un implant vertébral. L'implant vertébral peut être une plaque assortie d'un système de fixation vertébrale de type vis, échelon, ou monorail. En faisant tourner la rondelle, on obtient une gamme infinie d'angles et d'emplacements pour vis par rapport à l'axe central de la colonne vertébrale, ce qui permet d'assurer une flexibilité d'installation maximale ainsi que le transfert efficace de la charge s'exerçant sur la colonne vertébrale à l'implant, tout en maintenant un angle d'environ 90 ·C entre la tête de la vis et/ou l'écrou et la rondelle au contact de l'implant.

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