Patent ID: 8155738

Claim:
A device structure for iontophoresis which administers at least one of active ingredients to be partially ionized through the skin or the mucosa to the body, provides an active electrode and an electrically conductive layer containing an active ingredient; wherein the above described active electrode comprises at least one of conductive metal materials selected from silver, copper, and zinc; the above described electrically conductive layer has a composition adjusted at pH 3-9 comprising the active ingredient, a chloride ion and a water swelling methacrylate copolymer having a pH adjusting function; and the composition is composed of the following materials: (a) the active ingredient is a cationic material, (b) the chloride ion is supplied from at least one of hydrochloric acid, hydrochloride salts and chlorides of the active ingredients, and (c) the water swelling methacrylate copolymer is a basic methacrylate copolymer or a mixture of a basic methacrylate copolymer and an acidic methacrylate copolymer.