Development of a focusing device for the improvement of needle-free injector using electrically induced microbubbles

We have developed a novel needle-free injector based on the electrically induced microbubbles. In this article, firstly we evaluated the reagent injection depth using electrically induced microbubble injector. Then, we created elliptical hemispherical reflectors to focus the shock waves from the microbubbles and thus amplify the shock and expansion waves. We observed the shock and expansion waves from the microbubble by the ripple shadowing method and realized the amplification of the shock and expansion waves by the fabricated reflector.