EXPONENTIAL MEDICAL TECHNOLOGIES (PROPRIETARY) LIMITED
发明人:
PARKER, Christopher Daniel,ROGINSKY, Andrew
申请号：
IBIB2017/057011
公开号：
WO2018/087692A1
申请日:
2017.11.09
申请国别(地区):
IB
年份:
2018
代理人:
摘要：
This invention concerns an artificial intervertebral disc for installation in an intervertebral space between adjacent vertebral bodies. The artificial intervertebral disc prosthesis comprises an upper plate, a lower plate and a mobile core element, which is, in use, located between the upper and lower plates. The mobile core element includes a first contoured surface that has a flexion/extension radius that is larger by a determined amount than the radius of its second contoured surface that results in an instantaneous centre of rotation below the midline of the intervertebral disc space, thereby approximating the typical instantaneous centre of rotation of a natural disc. The first contoured surface of the mobile core element has a lateral bending radius that is unequal to the value of the flexion/extension radius, thereby allowing the mobile core element to self-centre on the second surface of the upper plate when under preload. The mobile core element may further be compressible and may include a resilient element located within the mobile core element. Deformation of the resilient element may be contained to obtain an exponential increase in spring stiffness of the resilient element during compression.La présente invention concerne un disque intervertébral artificiel destiné à être installé dans un espace intervertébral entre des corps vertébraux adjacents. La prothèse de disque intervertébral artificiel comprend une plaque supérieure, une plaque inférieure et un élément central mobile, qui est, lors de l'utilisation, situé entre les plaques supérieure et inférieure. L'élément central mobile comporte une première surface profilée qui possède un rayon de flexion/extension qui est plus grand d'une quantité déterminée que le rayon de sa seconde surface profilée, ce qui conduit à un centre instantané de rotation au-dessous de la ligne médiane de l'espace de disque intervertébral, approchant ainsi le centre instantané caractéristique de rotation d'un disque naturel.
