Geonwoo Kang, Minkyung Kim, Huisuk Yang, Jiwoo Shin, Jeeho Sim, Hyeri Ahn, Mingyu Jang, Youseong Kim, Hye Su Min, and Hyungil Jung^*

G. Kang, M. Kim, J. Shin, J. Sim, H. Ahn, Y. Kim, H. S. Min, H. Jung
Department of Biotechnology, Yonsei University, 50 Yonsei-ro, Seoul 08389, Republic of Korea
G. Kang, H. Yang, M. Jang
JUVIC Inc., 272 Digital-ro, Seoul 08389, Republic of Korea

^*CORRESPONDING AUTHOR : Hyungil Jung

Dissolving microneedle (DMN) is an attractive alternative to parenteral and enteral drug administration owing to its painless self-administration and safety due to non-generation of medical waste. For reproducible and efficient DMN administration, various DMN application methods, such as weights, springs, and electromagnetic devices, have been studied. However, these applicators have complex structures that are complicated to use and high production costs. In this study, a latch applicator that consists of only simple plastic parts and operates via thumb force without any external complex device is developed. Protrusion-shaped latches and impact distances are designed to accumulate thumb force energy through elastic deformation and to control impact velocity. The optimized latch applicator with a pressing force of 25 N and an impact velocity of 5.9 m s−1 fully inserts the drug-loaded tip of the two-layered DMN into the skin. In an ovalbumin immunization test, DMN with the latch applicator shows a significantly higher IgG antibody production rate than that of intramuscular injection. The latch applicator, which provides effective DMN insertion and a competitive price compared with conventional syringes, has great potential to improve delivery of drugs, including vaccines.