Currently, most of commercial needle-free jet injectors generate the liquid jet by a method called “driving object method” (DOM). However, the reliability and efficiency are still questioned. This paper proposes a new concept of jet generation method, known as “impact driven method” or IDM. A prototype of an IDM jet injector is tested to compare with a commercial device (Cool.click). Jet injection processes are visualized both in air and in 20% polyacrylamide by high speed photography. In this study, the first pulse gives a shorter erosion stage and then immediately the second pulse follows and provides a better penetration, wider lateral dispersion, and considerably less back splash. Hence, lower pain level and higher delivery efficiency should be achieved. It can be concluded that the IDM concept is highly feasible for implementation in real applications, either for human or animal injection. However, the control and accuracy of IDM still needs to be carefully investigated.
Needle Free Jet Injector, Impact Driven Method, High Speed Liquid Jets.