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Epidermal iontophoresis device

  • US 4,141,359 A
  • Filed: 08/16/1976
  • Issued: 02/27/1979
  • Est. Priority Date: 08/16/1976
  • Status: Expired due to Term
First Claim
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1. An iontophoresis device for epidermal application, comprising:

  • a. a constant current source;

    b. applicator and grounding electrodes for emplacement upon patient tissue to provide a current path therethrough for performing iontophoresis upon a portion of said tissue;

    c. means for electrically connecting said current source to said electrodes to thereby produce a voltage differential across said electrodes;

    d. an impedance checking circuit coupled to said electrodes and having means for setting predetermined limits of impedance as measured across said electrodes which mark the bounds of safe operation for said device, said impedance checking circuit also having means to signal the occurrence of impedance values outside these predetermined limits;

    e. a safety-shutdown circuit coupled to said impedance checking circuit and having means responsive to said impedance value signal for preventing current flow and voltage differential across said electrodes.

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