Prosthetic intervertebral disc or artificial vertebra

Details Prosthetic intervertebral disc or artificial vertebra Prosthetic intervertebral disc or artificial vertebra

A - Human Necessities

61

F

A61F 2/44 (2006.01)

Patent

CA 2563181

The intervertebral disc prosthesis or the intervertebral implant comprises: a cavity-like middle part (2) with a central longitudinal axis (6), an upper end (4) and with a lower end (5); an upper apposition plate (7), which is placed on the upper end (4) of the middle part (2) while being perpendicular to the longitudinal axis (6) and which is suited for resting against the base plate of a vertebral body, and: a lower apposition plate (8), which is placed on the lower end (5) of the middle part (2) while being perpendicular to the longitudinal axis (6) and which is suited for resting against the cover plate of a vertebral body. The middle part (2) comprises an elastic means (19) consisting of at least two coaxially arranged plate springs (20). This elastic means (19) has a progressive spring characteristic.

L'invention concerne une prothèse de disque intervertébral ou un implant intervertébral comportant une partie centrale (2) se présentant sous la forme d'un corps creux, présentant un axe longitudinal central (6), une extrémité supérieure (4) et une extrémité inférieure (5); une plaque d'apposition supérieure (7) disposée sur l'extrémité supérieure (4) de la partie centrale (2), perpendiculairement à l'axe longitudinal (6), destinée à s'appuyer contre la plaque de base d'une vertèbre; et une plaque d'apposition inférieure (8) disposée sur l'extrémité inférieure (5) de la partie centrale (2), perpendiculairement à l'axe longitudinal (6), destinée à s'appuyer contre la plaque de couverture d'une vertèbre. La partie centrale (2) comporte un élément élastique (19) composé d'au moins deux ressorts à disques (20) disposés de façon coaxiale, ledit élément élastique présentant une caractéristique de ressort progressive.

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