下行弯针（1）的后端固定在手柄（2）的一端上。
The back end of the down curved needles (1) is fixed onto one end of the handle (2).
机头外壳、机头上盖和手柄是注塑而成的。机头由机头外壳、机头上盖、转子芯和滑动轴承组成。转子芯由注塑涡轮、车针和垫圈组成。
The said head consists of casing, top cover, rotor core and sliding bearing and the said rotor core is composed of moulded turbine, needle and ring cushion.
本发明包括手柄和钻头，钻头为套管针结构，包括套管和管芯针两部分组成。
The invention comprises a handle and a drill bit, wherein the drilling bit has a trocar structure consisting of two parts, namely a sleeve and a tube core needle.
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