| 摘要 |
An implant including a pair of screws (2) for screwing into respective vertebral facets (3), a pair of hooks (5) each consisting of a body (6) and a blade (7), said body having a through-bore for the screw, and said bore having a longitudinal axis at a suitable angle to the central longitudinal plane of the blade (7) such that the hook blade can suitably engage the posterior arch (9), a resilient connecting member (11) for holding apart the two screws and urging the blades (7) against the edges of the posterior arch, and nuts (23) for locking the connecting member and the hooks to the screws. Said implant takes up less space on the posterior side than known implants and thus avoids undesirable lumps under the skin, and the above-mentioned angular offset enables the hooks to engage a suitable area on the edges of the posterior arch, so that the surgeon is not required to perform preliminary cutting of the posterior arch. |
