| 摘要 |
PCT No. PCT/EP89/00344 Sec. 371 Date Nov. 9, 1990 Sec. 102(e) Date Nov. 9, 1990 PCT Filed Mar. 30, 1989 PCT Pub. No. WO89/09030 PCT Pub. Date Oct. 5, 1989.In order to reduce the risk that a bone screw, in particular one made of resorbing plastic material, with an externally threaded shaft will be destroyed by high screw-in torques, it is proposed that an insertion channel open at the top, arranged concentrically with the shaft and extending along most of the length of the shaft be located in the shaft for an insertion tool and have a cross-section which is non-circular and corresponds to the cross-section of the screwing-in tool.
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