So how do you keep a pacemaker powered? Make the human the generator!
This is a remarkable concept from the University of Illinois at Urbana–Champaign. A solution to the need for batteries in some implanted medical equipment and the repeated surgery needed to replace them if they run out or encounter other problems. The piezo patch could potentially produce enough energy to keep a pacemaker running indefinitely as long as it does not lose it power source, the human heartbeat. The device is sewn onto the heart and then converts the movement to a small electrical charge, this in turns powers the connected devices.