Abstract
Needle-injection system is widely utilized for medical treatments. However, the system has various problems such as strong pain and infection. The usage of a highly-focused high-speed microjet as needle-free injection system is expected to solve these problems. For its safe and robust application it is necessary to understand injection performance such as ejected volume of the jet, which is one of the important indicators for drug injection system. We conduct experiments and find that the maximum volume of a laser induced bubble is about equal to the ejected volume.
