Therapeutic device for iontophoresing cation and anion

Claim 1

A therapeutic device for iontophoresing both cations and anions, comprising: a power source including a power switch, said power source being for electrifying the device; a first electrode containing an ionized medicament for acting as an active electrode when in use; a second electrode for acting as a dispersive electrode when in use; means for oscillating a low-frequency current in which an ac current is superposed on a dc current, said oscillating means having output terminals connected with said first and second electrodes for supplying said low-frequency current via said first and second electrodes and medicament to the head of a user; and means for switching the output polarity of said oscillating means in association with OFF/ON operation of said power switch, said switching means being provided between said oscillating means and said first and second electrodes, said switching means comprising: a magnet, a pair of yokes provided at opposite ends of said magnet, a pair of coil members provided around the ends of the yokes, a piece of magnetic body movably provided between the yokes, means for alternately electrifying the coil members in association with the OFF/ON operation of the power switch, and a set of electrical contacts openable and closeable in association with the movement of the piece of magnetic body, said electrical contacts being connected with said first and second electrodes in such manner that the polarity of said first and second electrodes is alternately reversed whenever the OFF/ON operation of the power switch is effected.