| 摘要 |
Self-tapping screw for small-bone surgery, includes a threaded proximal head ( 2 ), a threaded distal shank with greater pitch and an internal cannula ( 4 ), characterized in that the distal shank ( 3 ) is threaded over its entire length in that the end of the shank has, apart from milled portions forming self-tapping faces on the first distal threads, at least two milled faces and which with the cannula, determine at least two notches ( 11 ), and at least two self-boring edges at the distal end of the screw, and in that the thread of the head has, aside from milled portions forming self-tapping faces on the first threads of the proximal screw thread, chamfered faces ( 16-19 ), determining boring edges ( 12 b- 15 b) preceded by a short groove.
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