| 摘要 |
The present invention is directed to a vertebral bone prosthetic device comprising an interior body, provided with an outer surface and a first coupling elemen t thereon, and an exterior hollow body with a bore therein extending along a central axis, with the interior body being configured and dimensioned to be slidably received by th e exterior body along the central axis, and provided with an interior surface and an exterior surface, the interior surface having a groove. The device also comprises a fixation ring having inner and outer surfaces, with the inner surface having a second coupling element thereon. The fixation ring is configured and dimensioned to be received with in the groove of the exterior body for rotational movement about the central axis o f the exterior body. Rotation of the fixation ring results in engagement of the first and second coupling elements to thereby prevent relative sliding movement between the interior and exterior bodies. Also, the fixation ring is rotatable between first second positions, the first position disengaging the coupling elements and allowing relative slidi ng movement and the second position engaging the coupling elements and blocking relative sliding movement.
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