宁可室对圆形的结束感到圆筒形或者管状设计， 如此当做在操作期间减少“政情不稳地区”， 而且到另外最有效率地适应螺丝钻。
Preferably the chamber is of a cylindrical or tubular design with rounded ends, so as to reduce "hot spots" during operation, and to otherwise most efficiently accommodate the auger.
钻杆和钻铤等管状螺纹联接件是钻探和石油钻井工业中的关键设备。
Drill rod and collar are key apparatus in drilling exploration and well drilling industry.
本发明属医疗器械，具体涉及一种胫骨、股骨等人体管状骨头骨折部位治疗用的髓内钉空心钻。
The invention pertains to medical devices, in particular to an intramedullary nail hollow drill for the treatment of tibia, femur and other human tubular bones at the fracture site.
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