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Microneedle design. A, a computer-aided design (CAD) schematic showing a microneedle mounted onto a 30-gauge syringe needle. Each microneedle has a shaft height of 350 μm and a 60° taper from the shaft to the tip, which has a 5 μm radius of curvature. B, a scanning electron microscopy (SEM) image of a 100 and 150 μm diameter microneedle side by side, both mounted onto 30-gauge syringe needles. The hilt is the flat portion of the microneedle that contacts the syringe needle.
