Improved piercing of microneedle arrays in dermatomed human skin by an impact insertion method

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Verbaan, F.J. and Bal, S.M. and Berg, D.J. van den and Dijksman, J.A. and Hecke, M. van and Verpoorten, H. and Berg, A. van den and Luttge, R. and Bouwstra, J.A. (2008) Improved piercing of microneedle arrays in dermatomed human skin by an impact insertion method. Journal of Controlled Release, 128 (1). pp. 80-88. ISSN 0168-3659

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Abstract:An electrical applicator was designed, which can pierce short microneedles into the skin with a predefined velocity. Three different shapes of microneedles were used, namely 300 mu m assembled hollow metal microneedle arrays, 300 mu m solid metal microneedle arrays and 245 mu m hollow silicon microneedle arrays. The latter are available as 4 x 4, 6 x 6 and 9 x 9 arrays.
When using a velocity of 1 or 3 m/s reproducible piercing of dermatomed and full thickness human skin was evident from the appearance of blue spots on the dermal side of the skin after Trypan Blue treatment and the presence of fluorescently labeled particles in dermatomed skin. Manual piercing did not result in the appearance of blue spots. Transport studies revealed that i) piercing of microneedles with a predefined velocity into human skin resulted in a drastic enhancement of the Cascade Blue (CB, Mw 538) transport, ii) A higher piercing velocity resulted in a higher CB transport rate, iii) The CB transport rate was also dependent on the shape of the microneedles and iv) no difference in transport rate was observed between 4 x 4, 6 x 6 and 9 x 9 hollow silicon microneedle arrays.
Item Type:Article
Copyright:© 2008 Elsevier Science
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/68293
Official URL:http://dx.doi.org/10.1016/j.jconrel.2008.02.009
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