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Long-term implantable devices such as cardiac pacemakers are protected from corrosive tissue fluids by means of a metallic, hermetically sealed enclosure. When the electronic circuitry contacts infiltrating tissue fluids due to a corrosive breach in the hermeticity, failure of the device is almost immediate. Polymeric coatings have been investigated to serve as a secondary moisture barrier in this work.
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Devanathan et al. (1980) studied this question.
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