In a study presented at the American Heart Association's Scientific Sessions 2012, researchers presented findings that suggest an experimental device was capable of generating enough electricity to power a pacemaker through piezoelectricity (electricity generated through pressure). Using simulated heartbeats, the researchers found that the device was able to generate more than ten times the amount of electricity required to power modern pacemakers, and was able to generate this electricity over a ranger of heart rates. If this technology proves successful, it may eliminate the need to replace current pacemakers every five to seven years when their batteries run out.
http://www.sciencedaily.com/releases/2012/11/121104210843.htm
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