It would be cool to see this used in medicine. Imagine using advanced imaging and standing waves focused(dynamically, with the aid of the computer) on arterial blockages that you wanted to clear.
Nanobubbles [1] are already being studied for this very purpose. Drugs are packaged within small bubbles, and injected into the blood stream. Targeted drug delivery is performed by popping the bubbles using ultrasound waves from an external speaker.
While not the same idea as yours, a device similar to the one in this video was created at Argonne National Lab with the intention of helping make pharmaceuticals. I included a video below.
