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An array of porous microneedles was developed for minimally-invasive transdermal electrolytic connection through the human skin barrier, the stratum corneum. The length of microneedle was designed to be 100 μm so that it penetrates into the epidermis layer without pain. Each microneedle was supported by a thicker cylindrical post protruding from a planar substrate to realize its effective penetration...
A commercial painless microneedle was filled with physiological saline agar, and this needle-based salt bridge was inserted into the skin (a piece of porcine skin and a flank skin of a live mouse) to make an electrical contact with its subepidermal region. The transepidermal potential (TEP), the potential difference between the skin surface and the subepidermal region, was measured using this inner...
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