| 摘要 |
<p>The present invention relates to an intervertebral disc prosthesis (1) comprising at least three components, namely a first plate, called the upper plate (2), a second plate, called the lower plate (3), and a movable core (4) arranged between said plates (2, 3), characterized in that the movable core (4) comprises a concave upper surface (44) in congruent contact with the convex surface of the upper plate (2) and a convex lower surface (45) in congruent contact with the concave surface of the lower plate (3), each of said surfaces being defined by a distinct radius of curvature, the radius of curvature of the concave surface (44) of the core being less than that of its convex surface (45), the centres of said concave (44) and convex (45) surfaces being situated on the radial axis of symmetry of the central core and being placed on the same side of the prosthesis (1), namely that of the upper plate (2).</p> |
