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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Biomaterials. 2020 Nov 5;267:120491. doi: 10.1016/j.biomaterials.2020.120491

Figure 6.

Figure 6.

Analysis of microneedles used for delivery in the scientific literature. (i) Classification based on a) type of microneedle used for delivery, b) type of material or energy delivered, and c) testing environment. (ii) The different types of molecules delivered are identified for each type of microneedle: a) dissolvable, b) coated, c) hollow, and d) solid. (iii) The different types of microneedles are identified for each type of molecule delivered: a) vaccine, b) biomolecule, c) small, d) other and e) energy.