An implantable stimulation system comprises an implantable stimulator and a control device. The foundry part includes a longitudinal body provided with a longitudinal cavity with first and second apertures at its ends. An injector upstream of the catalyst beds introduces a reducing agent such as ammonia into the inlet gas stream. Error information indicating error in the estimated movement amount of the medium attributable to the angle of light directed at the medium is acquired, and the estimated movement amount is corrected. The mounting portion has a guide portion that slides on a sliding surface of the outer surface of the mounting projecting portion with the relative rotation of the handle member and the bottle body, and guides the relative rotation. The cathodes are too small for use with conventional heaters and so are heated from behind by an electron beam or an intense light beam, such as laser light transmitted via optical fiber to the back of the cathode.