Intervertebral disk prosthesis or artificial vertebra

Details Intervertebral disk prosthesis or artificial vertebra Intervertebral disk prosthesis or artificial vertebra

A - Human Necessities

61

F

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

Patent

CA 2502058

Disclosed is an intervertebral disk prosthesis comprising an essentially hollow cylindrical base element (1) which is provided with a casing (2) that is embodied as a bellows, a top end (3), a bottom end (4), and a central longitudinal axis (5), an upper apposition plate (6) which is disposed perpendicular to the longitudinal axis (5) at the top end (3) of the base element (1) and rests on the base plate of a vertebra, and a lower apposition plate (7) that is arranged perpendicular to the longitudinal axis (5) at the bottom end (4) of the base element (1) and leans on the cover plate of a vertebra. The casing (2) that is embodied as a bellows is configured as a spring element having a defined spring rate. Said structure largely approaches the function and purpose of a natural intervertebral disk.

L'invention concerne une prothèse discale comprenant un élément de base (1) sensiblement cylindrique et creux, doté d'une enveloppe (2) en forme de soufflet, d'une extrémité supérieure (3), d'une extrémité inférieure (4) et d'un axe longitudinal central (5), une plaque d'application (6) supérieure, placée à l'extrémité supérieure (3) de l'élément de base (1) transversalement à l'axe longitudinal (5) et apte à l'appui contre la plaque de base d'une vertèbre, ainsi qu'une plaque d'application (7) inférieure, placée à l'extrémité inférieure (4) de l'élément de base (1) transversalement à l'axe longitudinal (5) et apte à l'appui contre la plaque de couverture d'une vertèbre. L'invention est caractérisée en ce que l'enveloppe (2) en forme de soufflet sert d'élément élastique doté d'un coefficient d'élasticité déterminé. Cette conception s'approche notablement de la fonction d'un disque naturel.

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