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. 2017 Oct 9;3:17034. doi: 10.1038/micronano.2017.34

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) SEM of fabricated single open-channel microneedle connected to a reservoir by 3D laser lithography. (b) A 16 microneedle array (2.17 mm×2.17 mm) with side channels connected to reservoirs fabricated by 3D laser lithography, microneedles have 700 μm total height, 150 μm tip height, 150 μm flange height. (c) A 16 microneedle array (2.17 mm×2.17 mm) with side channels connected to reservoirs fabricated by 3D laser lithography, microneedles have 700 μm total height, 350 μm tip height, 150 μm flange height. (d) Microneedles in the middle rows having two side-opened channels connected to different reservoirs. (e) Ultra-sharp microneedle tip. (f) Stitching of two adjacent blocks.