PROBLEM TO BE SOLVED: To provide an in vivo potential measuring instrument capable of evaluating a contact state in real time, in which an insulating member in which an electrode is arranged is inserted into an organ of a living body, and an outer peripheral surface of the insulating member is in contact with an internal wall surface of the organ.SOLUTION: In a state in which an insulating member 20 in which an electrode 10 is arranged is inserted into an organ of a living body, and an outer peripheral surface of the insulating member 20 is in contact with an internal wall surface of the organ 70, a potential of a site in contact is detected with the electrode. Using a voltage measured by amplifying the potential detected by the electrode by an amplifier, a contact state in which the outer peripheral surface of the insulating member is in contact with an inner peripheral surface of the organ is evaluated.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】内部に電極が配置された絶縁性部材を生体の器官内に挿入して、絶縁性部材の外周面が、器官の内壁面に接触している接触状態をリアルタイムに評価することができる生体内電位計測器を提供する。【解決手段】内部に電極１０が配置された絶縁性部材２０を生体の器官内に挿入して、絶縁性部材２０の外周面を器官７０の内壁面に接触させた状態で、接触した部位の電位を電極で検出し、電極で検出した電位を増幅器で増幅することにより測定された電圧を用いて、絶縁性部材の外周面が、器官の内周面に接触している接触状態を評価する。【選択図】図１
