While the energy-harvesting devices do not have the energy density of batteries, their potentially endless supply coupled with smart embedded control of the application-specific operating duty cycle do make them useful for a number of biomedical applications. This chapter presents an advanced human-step-powered energy-harvesting mechanism to power a commercial wireless transmitter that can be used for motion-powered radio frequency identification (RFID)-based patient tracking applications. Near-field magnetic coupling has been in use to noninvasively charge up implanted pacemakers. The chapter describes a new conformal SCMR method, that is, CSCMR that achieves high efficiency and minimizes the volume of wireless powering systems. High efficiency enables CSCMR to deliver a significant amount of power to IMDs without excessive transmitter power. The chapter presents a number of batteryless ways to power biomedical sensors.
