A plurality of stator-side electrodes disposed in a stator is vertically disposed so as to face a plurality of mover-side electrodes disposed on a mover in a protruding manner. The frame includes at least a first, a second, a third, and a fourth sidewall. The invention contemplated herein may result in improved patient compliance, improved patient satisfaction, improved patient safety, improved communication between health care providers and a decrease in medication error rates. The busbar makes contact with the end surface of the line portion and is connected by welding to the connecting end portion. The switching section comprises at least one switching block, which is connected so that the amplitude of the pulse currents is increased. A second packaging material layer with the same thickness as that of the first packaging material layer fills the opening region of the first packaging material layer.