Visualization of penetration of a high-speed focused microjet into gel and animal skin

• DOI: 10.1007/s12650-019-00547-8
• Publication Date: 2019-02-20T04:58:23Z
• Authors: Akihito Kiyama; Nanami Endo; Sennosuke Kawamoto; Chihiro Katsuta; Kumiko Oida; Akane Tanaka; Yoshiyuki Tagawa
• Keywords: Penetration (warfare); Penetration rate

Realization of a needle-free drug delivery device can solve needle-caused problems. Recently, attention has been given to the use focused liquid jet instead existing that generates turbulent jet. This study experimentally visualized penetration into gel and animal skin with very high speed around 200 m/s. We first examined high-speed images evaluate dynamics gel. found depth is determined within short time $$t_p$$ (on order 0.01 ms). similar $$L/V_j$$ , where L $$V_j$$ are, respectively, impact tip. then investigated overall shape site represented by length ratio $$\alpha =L/W$$ W width site. Remarkably, $$\alpha$$ greater than unity for gel, as well skin. suggests create narrow target.