钝钻头 dull bit ; blunt bit
磨钝钻头 dulled bit
尖角钝角两用钻 drill and countersink combination
椎弓根钝头钻 a blunt-tipped drill
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目的设计一种新型椎弓根钝头钻，以期减少椎弓根螺钉植入的穿破率。
Objective to design a blunt-tipped drill of pedicle screw placement, in order to decrease the accident of pedicle violations during pedicle screw placement.
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