A dynamic current steering mixer. A plurality of cathode layers are formed on one surface of the flat plate-like solid electrolyte substrate, and a plurality of anode layers on the opposite surface thereof, and each fuel cell is formed from a pair of the cathode layer and the anode layer. The stabilizer has a tubular body having a cylindrical wall and a longitudinal bore contiguous with the production tubing. When the plunger is pushed during application, the substance is squeezed through the perforated element and the openings and is applied to the patient. The illuminating unit comprises a light boundary structure for a light source to be mounted thereon. The connection fitting includes a connection arm connected to the positive side lead plate and a cylindrical joint section integrally formed with the connection arm, the joint section being fitted in a root section of the motor lead wire drawn outside the frame through a grommet attached to the frame to be electrically connected to the motor lead wire.