Dissolving microneedles (DMNs), designed to release drugs and dissolve after skin insertion, have been spotlighted as a novel transdermal delivery system due to their advantages such as minimal pain and tissue damage, ability to self-administer, and no associated hazardous residues. The drug delivery efficacy of DMNs, however, is limited by incomplete insertion and the extended period required for DMN dissolution. Here, we introduce a novel DMN delivery system, DMN on an electrospun pillar array (DEPA), which can rapidly implant DMNs into skin. DMNs were fabricated on a pillar array covered by a fibrous sheet produced by electrospinning PLGA solution (14%, w/v). DMNs were implanted into the skin by manual application (press and vibration for 10s) by tearing of the fibers hung on the 300-μm pillars. Separation of DMNs from the fibrous sheet was dependent on both pillar height and the properties of the fibrous sheet. After evaluation of the implantation and dissolution of DMNs with diffusion of red dye by taking cross-sectional images of porcine skin, the hypoglycemic effect of insulin loaded DEPA was examined using a healthy mouse model. This DMN array overcomes critical issues associated with the low penetration efficiency of flat patch-based DMNs, and will allow realization of patient convenience with the desired drug efficacy.
|Number of pages||8|
|Publication status||Published - 2015 Sep 1|
Bibliographical noteFunding Information:
This study was performed in the Nanobiotechnology laboratory of Yonsei University. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2015-11-0050 ). The authors would like to thank Chang Yeol Lee, Manita Dangol, Cheng Guo Li, and Minjoo Park for their assistance with the research.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Mechanics of Materials