PROBLEM TO BE SOLVED: To provide a surgical boring tool with which a big opening with a large diameter can be formed at an outlet side of the through-hole, while strength of the tool can be secured and the diameter of a small opening at the inlet side can be reduced at the same time.SOLUTION: The surgical boring tool 1 is used for boring the through-hole 60 into a bone with the small opening 61 on the inlet side of the boring and the big opening 62 on the outlet side of the boring. The surgical boring tool includes: a cylindrical shaft 10 having a distal end 10a and a proximal end 10b an shaft-shaped cutter bit 20 turnably pivoted around the distal end 10a of the shaft 10 with a turning axis K almost orthogonal to the axis A10 of the shaft 10, and having a blade 51 for boring the small opening and a blade 52 for boring the big opening and a base member 3 connected to the proximal end 10b of the shaft 10. The base member 3 has an rod-shaped part 30 inserted into the shaft 10 to control turning of the cutter bit 20.COPYRIGHT: (C)2013,JPO&INPIT【課題】貫通孔の出口側に大径の太孔を容易に形成することができ、且つ器具の強度確保と入口側の細孔径の縮小化とを両立できる手術用穿孔器具を提供する。【解決手段】穿孔入口側に細孔61が配置され、穿孔出口側に太孔62が配置される貫通孔60を骨に穿設するための穿孔器具1を、先端10aおよび基端10bを有する筒状のシャフト10と、シャフト10の軸線A10に略直交する回動軸Kをもってシャフト10の先端10aに回動可能に枢支され、細孔穿孔用の刃51および太孔穿孔用の刃52を有する軸状のカッタービット20と、シャフト10の基端10bに連結されるベース部材3とを備えるものとし、ベース部材3を、シャフト10に挿入されてカッタービット20の回動を規制する棒状部30を備えるように構成する。【選択図】図2
