A HUMAN NECESSITIES
A61 MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61N ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
A61N1/00 Electrotherapy; Circuits therefor
A61N1/0404 for external use
A61N1/0472 Structure-related aspects
A61N1/0476 Array electrodes (including any electrode arrangement with more than one electrode for at least one of the polarities)