| 摘要 |
<p>The implant, comprising a vertebral hook or pedicular anchoring screw (1), has a forked upper end (2) to receive a linking rod (14) closed by a hollow locking nut (9) with a threaded cylindrical inner surface (8) and a horizontal top (10). The nut has a central cylinder (11) that fits between the branches (3, 4) of the fork and prevents them flexing as the nut is tightened by a tool inserted into the cylinder's hexagonal cavity (12). A variant of the design incorporates an adapter for the fork with recesses to receive two thinner flexible rods.</p> |
