The present invention relates to a catheter that has a simplified structure and can be easily downsized. The catheter according to the present invention is a catheter that extends in one direction and has a proximal end portion and a distal end portion, and includes a first support member in which a first hollow is formed； a second support in which a second hollow is formed. A member； a third hollow is formed； the drive tube is inserted into the first hollow and the second hollow and moves the first support member or the second support member in a length direction； the first support member and the One or more connecting members configured such that, when the distance to the second support member is close, at least a part of the connecting member is bent and the bent portion is distant from the third hollow central axis； One or more electrodes for generating heat； and a shaft body in which a fourth hollow is formed in which both ends in the length direction are opened so that the drive tube can be inserted and moved in the length direction. Can be included.本発明は、構造が簡素化されて小型化が容易なカテーテルに関する。本発明によるカテーテルは、一方向に長く延びて近位端部と遠位端部を備えるカテーテルであって、第１中空が形成された第１支持部材；第２中空が形成された第２支持部材；第３中空が形成され、前記第１中空及び前記第２中空に挿入され、前記第１支持部材または前記第２支持部材を長さ方向に移動させる駆動チューブ；前記第１支持部材と前記第２支持部材との間の距離が近くなる場合、少なくとも一部分が折り曲げられ、折曲部位が前記第３中空の中心軸から遠くなるように構成された１つ以上の連結部材；前記連結部材に備えられ、熱を発生させる１つ以上の電極；及び前記駆動チューブが挿入されて長さ方向に移動できるように長さ方向の両端が開放された形態の第４中空が形成されたシャフトボディを含むことができる。
