Engineers have developed a tiny wirelessly powered self-propelled device that can navigate the blood stream to deliver drugs do diagnostics or microsurgeries. Ada Poon assistant professor at the Stanford School of Engineering demonstrated the device Wednesday at the International Solid-State Circuits Conference (ISSCC) in the US. Such devices could revolutionize medical technology said Poon. Applications include everything from diagnostics to minimally invasive surgeries. Poon is developing a new class of medical devices that can be implanted or injected into the human body and powered wirelessly using electromagnetic radio waves. No batteries to wear out. No cables to provide power.