Iontophoresis device

• US 4,764,164 A
• Filed: 10/30/1985
• Issued: 08/16/1988
• Est. Priority Date: 09/01/1983
• Status: Expired due to Term

• Current Assignee: Hisamitsu Pharmaceutical Company Incorporated
• Original Assignee: Kabushiki Kaisya Advance Kaihatsu Kenkyujo
• Inventors: Sasaki, Minoru
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Shay, David
• Application Number:
  US06/792,245
• Time in Patent Office: 1,021 Days
• Field of Search: 128/419 D, 128/422, 128/783, 128/741, 128/734, 604/20
• US Class Current: 604/20
• CPC Class Codes: A61N 1/0436 Material of the electrode
• CPC Class Codes: A61N 1/044 Shape of the electrode
• CPC Class Codes: A61N 1/325 for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body electrodes for external use A61N1/0428

Abstract

A device for iontophoresis including an electric source, a pulse generator, a working electrode, and a counter electrode is described. This device has a circuit for discharging the charges accumulated in said electrodes during each intermission period of therapeutic pulses generated by said pulse generator (i.e., a circuit for effecting the depolarization between the above-mentioned both electrodes during each intermission period of therapeutic pulses).

This device can be directly and very easily applied to the human skin, without causing undesirable irritation in the skin, especially without causing burns and rubefaction in the skin.

Claims

1. In an iontophoresis device including an electric power source, a working electrode and a counter electrode, the improvement which comprises:

said device having a pulse generator means which is driven by said electric power source for producing a therapeutic pulse voltage of high frequency between said working and counter electrode and a shortcircuiting means for shortcircuiting said working and counter electrodes in an intermission period of said therapeutic pulse voltage for a selected duration to depolarize polarized potentials therebetween to a predetermined low level close to a base line, thereby producing iontophoresis by high frequency pulse current without skin irritations.

2. The device of claim 1 which further includes means for controlling output current.

3. The device of claim 1 which further includes a means for recovering residual charges stored in the skin as a result of the polarization capacity thereof.

4. The device of claim 3, wherein said means for recovering the residual charges is an inductor for discharging and simultaneously recovering the residual charges of the skin by L-C resonance between the inductance of said inductor and the capacitance of the skin.

5. The device of claim 1, wherein said therapeutic pulse voltage has a frequency in the range of 1 kHz to 500 kHz.

6. The device of claim 5, wherein said therapeutic pulse voltage has a duty ratio in the range of 0.1 to 0.7.

7. The device of claim 6, wherein said shortcircuiting means is designed to depolarize the polarized potentials between said working and counter electrodes to a level less than 3V.

8. The device of claim 1 which further includes a voltage converter for amplifying voltage from said electric source.