Peter Halverson,Larry L. Howell,Spencer P. Magleby,Anton E. Bowden
申请号：
US12029046
公开号：
US08308801B2
申请日:
2008.02.11
申请国别(地区):
US
年份:
2012
代理人:
摘要：
Provided is an intervertebral disc prostheses for installation in a spinal column between superior and inferior vertebral bodies. A first intervertebral plate engages one or both of the inferior vertebral endplate and the inferior ring apophysis of the superior vertebral body. A second intervertebral plate engages one or both of the superior vertebral endplate and the superior ring apophysis of the inferior vertebral body. A biaxial rolling-contact core is located between the intervertebral plates. The core includes a convex upper surface and a convex lower surface. The upper surface is curved around a first axis and the lower surface is curved around a second axis that is rotated relative to the first axis. The core is capable of rolling translation relative to the first intervertebral plate along the upper surface and in a first direction, and rolling translation relative to the second intervertebral plate along the lower surface and in a second direction. A flexure constrains the biaxial rolling-contact core to a rolling translation without sliding in at least one of said first direction and said second direction.
