Scientists have successfully designed tiny medical devices that can be implanted via catheter or needle, but no suitable method has been available for recharging such devices when they are deep within the body. Now, however, Stanford University researchers have developed a new type of wireless power transfer that uses roughly the same power as a cell phone to safely penetrate through bodily tissues (Ho JS et al. Proc Natl Acad Sci U S A. doi:10.1073/pnas.1403002111 [published online May 19, 2014]).
Hampton T. Wireless System Transfers Power to Deep-Tissue Microimplants. JAMA. 2014;312(1):19. doi:10.1001/jama.2014.8060