nuclear pacemaker

nu·cle·ar pace·mak·er

a nuclear-powered unit used to generate the electrical current for artificially pacing the heart; replaced by units using long-life nickel-cadmium and other power sources.
Farlex Partner Medical Dictionary © Farlex 2012
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By some estimates, more than 3,000 patients received nuclear pacemakers during the 1970s and '80s.
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