Hydrogel intervertebral disc nucleus with diminished lateral...

Details Hydrogel intervertebral disc nucleus with diminished lateral... Hydrogel intervertebral disc nucleus with diminished lateral...

A - Human Necessities

61

F

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

Patent

CA 2158764

A prosthetic nucleus (10) for a vertebral disc is made of a hydrogel material. The hydrogel prosthetic nucleus has a shape generally conforming to the natural nucleus pulposus, and it exhibits diminished lateral bulging under high compressive loads. The hydrogel has a water content of from 30 % to 90 % and has a compressive strength of 4MNm-2 or greater. When the hydrogel material is dehydrated, it has a dimension of less than half of that of the hydrated hydrogel nucleus. The prosthetic nucleus may be formed of two or more pieces of hydrogel material (42, 44) which pieces, when combined, have a shape generally conforming to the natural nucleus. The prosthetic nucleus may have a stiff posterior periphery (24) and/or a thickened anterior wall (28).

Un noyau prothétique (10) de disque vertébral est réalisé en hydrogel et présente une forme correspondant en général à celle du noyau gélatineux naturel, et il présente un renflement latéral réduit sous une forte charge compressive. L'hydrogel a une teneur en eau pouvant aller de 30 à 90 % et présente une résistance à la compression de 4 MNm-2 ou plus. Quand cet hydrogel est déshydraté, son volume est inférieur à la moitié de celui du noyau d'hydrogel hydraté. Ce noyau prothétique peut être constitué de deux éléments d'hydrogel ou plus (42, 44) qui, une fois combinés, présentent une forme qui correspond globalement à celle du noyau naturel. Ce noyau prothétique peut être doté d'une périphérie postérieure rigide (24) et/ou d'une paroi antérieure épaissie (28).

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