PROBLEM TO BE SOLVED: To provide a medical device capable of accurately applying a prescribed amount of energy with a prescribed intensity to an affected part from an energy discharging part while keeping a constant angle at which the energy discharging part abuts a part such as a hearts inner wall or a blood vessel inner wall.SOLUTION: A medical device comprises: a long insertion member with a bendable distal end side, which is inserted into a blood vessel a plate member having a contact surface perpendicular to a shaft direction of the insertion member and tiltably connected to a distal end of the insertion member through an elastic member and an energy discharging part fixed to the plate member for discharging energy to a direction perpendicular to the contact surface of the plate member from the contact surface.COPYRIGHT: (C)2015,JPO&INPIT【課題】エネルギ放出部が心臓内壁や血管内壁等の部位へ当たる角度を一定として、所望の強度かつ所望の量のエネルギをエネルギ放出部から患部に正確に加えることができる医療用デバイスを提供することである。【解決手段】血管内に挿入されるとともに、遠位端側が屈曲可能な長尺の挿入部材と、前記挿入部材の軸方向に垂直な当接面を備え、該挿入部材の遠位端に弾性部材を介して傾動自在に連結されたプレート部材と、前記プレート部材に固定され、該プレート部材の当接面から該当接面に垂直な方向にエネルギを放出するエネルギ放出部とを有することを特徴とする医療用デバイス。【選択図】図3