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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Vaccine. 2014 Feb 11;32(16):1856–1862. doi: 10.1016/j.vaccine.2014.01.076

Figure 3.

Figure 3

Usability of microneedle patches. (A) Usability for insertion with thumb pressure alone (n=69). (B) Usability with the snap-based device (n=20). The y axis shows the percent of microneedles in a patch that punctured skin, as determined by a skin staining assay. Attempts SA1 through SA3 are participant self-administrations. Best SA is the highest percent administered from the three attempts by a participant. The control is investigator administration. A random jitter was applied to separate overlapping points (±1% on the y-axis).