Artificial intervertebral disc having a spider spring force...

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/44 (2006.01)

Patent

CA 2468637

An artificial disc having a pair of opposing plates (100a, 100b) for seating against opposing vertebral bone surfaces, separated by a spider spring (200a1- 12) having a plurality of spring arms (202a1-12) extending radially from a central hub (204a1-12). Various spring arm embodiments disclosed include spring arms that are straight, bowed, grooved, wavy, thinning, or thickening; and spring arms with parallel sides, radially outwardly diverging sides, or radially outwardly diverging and curving sides. Various spider spring embodiments disclosed include spider springs with central hubs that are solid, bored, have curvate sockets, or have semispherical protuberances. Various plate embodiments disclosed include plates having, on inwardly facing surfaces, a curvate socket, a semispherical protuberance, a circular recess, or a flat surface. The spider springs are disposable between the plates, through various disclosed couplings, so that the plates 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 reposer contre des surfaces osseuses vertébrales opposées, séparées par un ressort araignée doté d'une pluralité de bras de ressort s'étendant de manière radiale à partir d'un moyeu central. Des modes de réalisation variés de bras de ressort comprennent des bras de ressort droits, courbés, rainurés, ondulés, s'amincissant ou s'épaississant; et des bras de ressort à côtés parallèles, à côtés divergents vers l'extérieur de manière radiale, ou à côtés incurvés et divergents vers l'extérieur de manière radiale. Des modes de réalisation variés de ressort araignée comprennent des ressorts araignée dotés d'un moyeu central solide, alésé, doté de cavités incurvées, ou de protubérances semisphériques. Des modes de réalisation variés de plaques comprennent des plaques présentant, sur leurs surfaces faisant face à l'intérieur, une cavité incurvée, une protubérance semisphérique, un renfoncement circulaire, ou une surface plane. Les ressorts araignée peuvent être disposés entre les plaques, par le biais de dispositifs d'accouplement variés, de sorte que les plaques se compriment, effectuent librement un déplacement rotatif et angulaire l'une par rapport à l'autre, permettant au disque artificiel d'imiter le comportement d'un disque intervertébral naturel sain.

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