An array of porous microneedles for transdermal monitoring of intercellular swelling

Kuniaki Nagamine, Jun Kubota, Hiroyuki Kai, Yoshinobu Ono, Matsuhiko Nishizawa

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


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 even into elastic human skin. Since this support (post and substrate) was equally porous as the needles, the needle chip was entirely permeable for electrolyte. This ion-conductive porous microneedle array was applied to the transdermal conductometry with small direct current for local monitoring of intercellular swelling, edema. The porous needle-based electrode system could be a platform for various transdermal electrical diagnosis and treatments.

Original languageEnglish
Article number68
JournalBiomedical Microdevices
Issue number3
Publication statusPublished - 2017 Sept 1


  • Edema
  • Electrolyte permeable
  • Porous microneedle
  • Transdermal monitoring


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