| 摘要 |
The invention relates to a bone screw comprising two axially terminal thread ed segments (5; 7) and a central segment (6), the outer diameter DVS of the fro nt threaded segment (5) being smaller than the core diameter DKH of the rear threaded segment (7), and the outer diameter DMS of the central segment (6) being smaller than the core diameter DKV of the front threaded segment (5). The invention also relates to a device for repositioning, compressing and fixing bone fragments, said device being characterised in that a) it compris es an implantation instrument (15) comprising a central bore hole (17) which coaxially penetrates said instrument in such a way that b) a screw driver (1 6) can be guided through the central bore hole (17) from the rear end (19) of t he instrument (15); c) the central bore hole (17) comprises an internal screw thread (20) on the front end (18) of the instrument (15), said internal scre w thread being complementary to the external screw thread (9) of the rear threaded segment (7) of the bone screw (1) and extending from the front end (18) of the implantation instrument (15) to a certain depth T; and d) the depth is T >= L, L representing the length of the rear threaded segment ( 7) of the bone screw (1).
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