PROBLEM TO BE SOLVED: To provide a therapy tool which facilitates an operation of cutting the root canal of a tooth or removing a nerve thereof, thereby reducing fatigue of a dentist and helping the dentist to maintain concentration.SOLUTION: A vibration-side housing 14 is attached to the tip of a handle-side housing 10, and accommodates a motor 2 having a plate cam 21 attached to a rotating shaft 20. A distal end portion of the vibration-side housing 14 has a vibration tube mounting opening 15, in which a vibration tube 16 is installed. The vibration tube 16 is installed in the vibration-side housing 14 so as to be able to vibrate in forward and backward directions while being urged by means of a spring 18 in the direction of the plate cam 21. The vibration tube 16 is placed in contact with the plate cam 21 via a roller 19 disposed at the rear end of the vibration tube. The vibration tube 16 has a reamer mounting opening 17 at the tip thereof for receiving and tightly holding an insertion attachment portion 30 of a reamer 3. The reamer 3 comprises a bendable needle portion 31 and can be attached to and detached from a vibration-side housing 12.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】 歯の根管の切削や神経を抜く作業が容易に行い得るようにすることにより、歯科医師の疲労を少なくして集中力が持続できるような治療用具を提供する。【解決手段】 ハンドル側筐体１０の先に振動側筐体１４を取り付け、ここに回転軸２０に板カム２１が取り付けたモータ２を納める。振動側筐体１４の先端部に振動筒装着口１５を開口し、ここに振動筒１６を装着する。この振動筒１６を振動側筐体１４に対してバネ１８を以て板カム２１の方向に付勢させつつ前後方向に振動可能に設ける。振動筒１６はその後端部のコロ１９を以て板カム２１に接触するようにする。振動筒１６の先にリーマ装着口１７を開口し、リーマ３の挿着部３０を受け入れてきつく保持し得るようにする。この屈曲性を有する針部３１を備えたリーマ３は振動側筐体１２に対して着脱が可能である。【選択図】図１
