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Power from Within
08 February 2014

Power from Within

When the battery dies in an artificial pacemaker, the patient has to go under the knife to get a replacement. Not for much longer, perhaps, as scientists have developed a flexible energy-harvesting device (pictured here on a cow’s heart) that converts the movement of organs into electrical energy, which is then stored in a rechargeable micro-battery. The device relies on thin ribbons of a man-made compound called lead zirconate titanate, which has a piezoelectric effect – meaning that it accumulates electrical charge in response to mechanical stress. When the bendy generator was tested in living cows, sheep and pigs, it generated enough juice to power a human pacemaker. For the moment, there are still concerns that the heart could be poisoned if the lead-containing compound leaks. But if scientists can find a non-toxic piezoelectric material with similar efficiency, the days of surgical procedures to change a battery may be numbered.

Written by Daniel Cossins

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BPoD stands for Biomedical Picture of the Day. Managed by the MRC Laboratory of Medical Sciences until Jul 2023, it is now run independently by a dedicated team of scientists and writers. The website aims to engage everyone, young and old, in the wonders of biology, and its influence on medicine. The ever-growing archive of more than 4000 research images documents over a decade of progress. Explore the collection and see what you discover. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.

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