An expandable medical balloon for use in combination with a catheter assembly, the balloon having a torque in a first and second unexpanded state, and to methods of making and using the same. A self station searches processors including circuit groups which are allocated to a certain route, and requests circuit group state from the searched processors successively. Through the gettering process, the crystalline silicon film can be obtained in which the concentration of nickel contained therein is sufficiently reduced. A lower surface of the sapphire substrate is irradiated by laser beam so that the sapphire substrate is removed from the unit light emitting structures. The washable adhesive may be an organopolysiloxane or gelatinous elastomer. A second layer comprising a top sheet of material and a bottom sheet of material are also welded together so as to form a plurality of chambers in fluid communication with each other.