In 1970, the Journal of Electrocardiology published an article by Ohio researcher Dr. J. William Spickler, who claimed to have designed a pacemaker small enough to fit entirely inside the heart’s right ventricle. But the device, implanted in dogs, had too many problems to be viable. Forty-five years later, a team of more than 100 Medtronic PLC scientists and engineers based mainly in Minnesota has designed a tiny investigational pacemaker, the Micra, that fits inside the same heart chamber.
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