The invention comprises a handle and a drill bit, wherein the drill bit takes the structure of a trocar and consists of two parts of a sleeve and a mandrin;
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 drill bit takes the structure of a trocar and consists of two parts of a sleeve and a mandrin;
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。
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