Say goodbye to batteries because John Rutgers and his researchers at the University of Illinois have figured out a way to use our organs to power devices. The whole idea will radically change additional invasive surgery.

The researchers used a piezoelectric material called lead zirconate titanate, and deposited the conductive bits onto a flexible silicone base that could easily move with an organ. When put under stress as the organ moves, the material becomes slightly deformed, and squeezes out its electrons to create net electrical charges both positive and negative on either end.

They then connected this silicone strip to a rechargeable battery and implanted it on the heart, lungs and diaphragms of animal subjects.

According to New Scientist, their system was able to produce 0.2 microwatts per square centimeter, which would be enough to run an off-the-shelf pacemaker.

The only thing left to do is to see how long can the device last in the body. Check out the video below: [New Scientist]