Artificial intervertebral disc having a wave washer force...

A - Human Necessities – 61 – F

Patent

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A61F 2/44 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2451359

An artificial disc having a pair of opposing plates (100b) for seating against opposing vertebral bone surfaces, separated by a wave washer (200a) having a circumferential extent surrounding a central bore. Various wave washer embodiments disclosed include circumferential extents that are ring-shaped, spiral-shaped, straight, bowed, grooved, wavy, thinning, thickening, and slotted. Various central bores disclosed include simple bores and bores that form a curved socket. Various plate embodiments disclosed includeplates having, on inwardly facing surfaces, a flat surface, a circular recess, a ball- shaped protuberance that is mateable with the curvate socket. The wave washers (200a) are disposable between the plates (100b), through various disclosed coupling, so that t he plates (100b) compress, rotate and angulate freely relative to one another, enabling the artificial disc to mimic a healthy natural intervertebral disc.

L'invention concerne un disque artificiel comportant une paire de plaques opposées destinées à être disposées contre des surfaces osseuses vertébrales opposées, séparées au moyen d'une rondelle ondulée s'étendant circonférentiellement autour d'un alésage central. Des modes de réalisation variés de rondelle ondulée comprennent des extensions circonférentielles, de forme annulaire, de forme spiralée, droite, recourbée, rainurée, ondulée, s'amincissant, s'épaississant, et fendue. Des alésages centraux variés comprennent des alésages simples, et des alésages qui forment une cavité incurvée. Des modes de réalisation variés comprennent des plaques présentant, sur des surfaces tournées vers l'intérieur, une surface plate, un renfoncement circulaire, ou une protubérance en forme de boule, pouvant s'accoupler avec la cavité incurvée. Les rondelles ondulées peuvent être disposées entre les plaques, par le biais de dispositifs d'accouplement variés, de sorte que les plaques se compriment, effectuent une rotation et forment un angle librement les unes par rapport aux autres, permettant au disque artificiel d'imiter un disque intervertébral naturel sain.

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