PROBLEM TO BE SOLVED: To provide a contact detection instrument related to a contact detector 1 that is inserted into living bodies etc. and comes in contact with an in vivo organ, outputs a signal according to the condition of the organ being a contact object and uses a sound wave.SOLUTION: A contact detection instrument 1 is characterized in that: a sound passage pipe 11 is connected to a movable sound passage pipe 21, at each of one-side ends, through a sliding surface 31 a speaker 3 and a microphone 5 are comprised in the other side of the sound passage pipe 11 a sound passage side face 27 is included in the other end of the movable sound passage pipe 21 a sensor 51 having a cavity 53 and an elastic body 55 in the movable sound passage pipe 21 and a sliding surface sound passage 33 in the sliding surface 31 is rotationally symmetrical to an axis 37 passing an intersection point 35 between a central line 15 of the sound passage pipe 21 and the sliding surface 31 and being perpendicular to the sliding surface 31. Even if the movable sound passage pipe 21 is movable, the length of a full-length L of the sound passage is not changed. Accordingly, even if the movable sound passage pipe 21 is made movable, the contact detection using the reflected sound is possible.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2018,JPO&INPIT【課題】生体等に挿入されて生体内の臓器と接触し、接触対象の臓器の状態に応じた信号を出力する音波を用いた接触検出器1に関する。【解決手段】音通路管11と可動音通路管21が摺動面31を介して接続され、音通路管11の他方にスピーカ3とマイクロフォン5と、可動音通路管21の他方に音通路端面27と、可動音通路管21に空洞53及び弾性体55を有するセンサ51と、を備え、音通路管21の中心線15と摺動面31との交点35を通り、摺動面31に垂直な軸37に対して、摺動面31内の摺動面音通路33が回転対称であることを特徴とする接触検出器具1である。可動音通路管21が可動をしても音通路の全長Lの長さは変化しない。よって、可動音通路管21を可動させても、反射音を用いた接触検出が可能である。【選択図】 図6
