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Microneedle device used for intradermal insulin administration. (A) A 900-μm-long hollow microneedle (left) next to a 9-mm insulin infusion set catheter (right). (B) A magnified view of the microneedle showing the beveled tip opening. (C) The microneedle holder and insertion device, consisting of the (1) device base structure, (2) microneedle holder, (3) microneedle insertion depth controller, and (4) set screw. Color images available online at www.liebertonline.com/dia.
