| 摘要 |
The present invention relates to an intervertebral disc prostheses that comprise at least three pieces including an upper plate ( 1 ), a lower plate ( 2 ) and a mobile core ( 3 ) at least relative to the lower plate ( 2 ), the upper surface of the core ( 3 ) being in contact with at least a part of the lower surface of the upper plate ( 1 ), limit stops ( 22, 31 ) allowing friction to be limited, while limiting or preventing the movements of the core ( 3 ) relative to the lower plate ( 2 ), in translation and in rotation, respectively, along an axis substantially parallel to the lower plate ( 2 ) and about an axis substantially perpendicular to the lower plate ( 2 ) and the lower surface of the core ( 3 ) has at least one hole ( 41 ) facilitating sliding of the core ( 3 ) relative to the upper surface of the lower plate ( 2 ) with which it is in contact.
|
