An operation device for performing a procedure on a lumen in a body comprises: a single protection tube formed of a flexible material； first and second tube members provided in the protection tube； and first and second clamp-type effectors respectively provided at respective front ends of the first and second tube members, wherein operational wires, respectively, are inserted into the first and second tube members to connect the clamp-type effectors positioned at the front ends thereof with first and second manipulation handles positioned at rear ends thereof, wherein the first and second clamp-type effectors are manipulated by moving the operational wires using the first and second manipulation handles in front or rear directions, and wherein electric lines are connected with the first and second clamp-type effectors to electrothermally treat a lesion portion in the body.
