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. 2018 Oct 22;1:173. doi: 10.1038/s42003-018-0170-z

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Fig. 2 — Microneedle assembly and arrays. a Single microneedle (length of 1500 µm) within polymer housing with glass capillary collection tube. b Glass capillary collection tube with ISF collected from a human subject using a 1500 µm microneedle length. c 3D printed microneedle holder for 1500 µm needle length; inner diameter of concentric ring surrounding microneedles are ~2.8 mm. d Two 3D microneedle holders adhered to a human subject for ISF extraction and collection in glass capillary tubes. Scale bars; (a): 5 mm, (b): 1 mm, (c): 1 cm, (d): 1 cm