| 摘要 |
An implant screw assembly comprising; an inner screw provided with a thread on an outer periphery of one end, and with a base at the other end, wherein an angled socket for a wrench or a slot for a driver is provided at the base, an outer screw provided with a thread on at least part of an outer periphery, and coaxially disposed around the periphery of the base of the inner screw, wherein the thread of the inner screw and the thread of the outer screw are in the same rotation direction, and a meshing structure formed by an outer peripheral face of the inner screw and an inner peripheral face of the outer screw, to prevent relative rotation between the inner screw and the outer screw, whereby the outer screw and the inner screw are only able to slide axially.
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