Abstract
Currently, needle-free injection system has been developed all over the world instead of typical injection system with a needle. Generally, the free injection system can be divided into a powder injection, a depot type injection and a liquid injection. In particular, the powder injection is mainly investigated recently, but it is said that the liquid injection is more effective than the powder injection in the case that the drug is transported at the deep position of subcutaneous tissue. However, the study of liquid injection is not conducted as much as that of powder injection. The goal of this study is to deliver the drug to arbitrary area of the human tissue without pain. Therefore, the objectives in the present study is to investigate the way to generate high speed micro water jet and to clarify the behavior of the water jet inside the body with viscoelasticity.
