IONTOPHORETIC DELIVERY DEVICE

摘要

An electrically powered iontophoretic delivery device is provided. The device utilizes electrodes composed of a preferably hydrophobic polymeric matrix. The matrix contains about 10 to 50 vol% of a material capable of absorbing a liquid solvent, typically water, to provide a plurality of ion conducting pathways through the matrix. The matrix also contains about 5 to 40 vol% of a chemical species which is able to undergo either oxidation or reduction during operation of the device. Preferably, the solvent absorbing material is a hydrophilic polymer such as polyvinylpyrrolidone. For the anodic electrode, the chemical species should be able to undergo oxidation and is preferably either silver or zinc. For the cathodic electrode, the chemical species should be able to undergo reduction and is preferably silver chloride or a reducible metal.