PROBLEM TO BE SOLVED: To provide a bone drilling hollow drill manufactured at a low cost with a simple structure, extremely low in the produced amount of chips from shaving and cutting a bone during drilling, and easily extracting bone marrow.SOLUTION: The bone drilling hollow drill 1 for opening a hole in the bone and extracting the bone marrow B1 is formed with a cutting edge 3 extending in completely circular ring shape and gradually thinned in wall thickness toward the tip, at the tip of a cylindrical hollow drill body 2, and formed with a level difference 2a facing the rear end side, on the inner peripheral surface of the tip part of the hollow drill body 2 at least.COPYRIGHT: (C)2012,JPO&INPIT【課題】 簡易な構造で安価に製造でき、穿孔時に骨の削り屑や切り屑の発生量が極めて少ないと共に、容易に骨髄を採取可能な骨穿孔用中空ドリルを提供すること。【解決手段】 骨に孔を開けると共に骨髄B1を採取するための骨穿孔用中空ドリル1であって、円筒状の中空ドリル本体2の先端に、真円の円環状に延在していると共に先端に向けて肉厚が漸次薄くされた切れ刃3が形成され、少なくとも中空ドリル本体2の先端部の内周面に、後端側に向いた段差2aが形成されている。【選択図】 図2
