US Patent 8702700 Surgical treatment device

A surgical treatment device which is used together with an endoscope, includes a sheath, a treatment portion which is arranged at the distal end portion of the sheath and includes first to third electrodes configured to treat a living tissue by using electrical energy, an operation portion which is arranged at a proximal end portion of the sheath and which is configured to operate the treatment portion, and a switching portion which is configured to switch between a first mode in which a treatment is given by using the first electrode and at least one of the second and third electrodes in the treatment portion and a second mode in which a treatment is given by using the second and third electrodes.