Shares of the medical device maker Boston Scientific Corp. declined Tuesday, a day after the Natick company said it had agreed to buy Rhythmia Medical Inc., a Burlington developer of medical software. Boston Scientific will pay $90 million upfront and make as much as $175 million in milestone payments over five years. Rhythmia develops mapping and navigation software for use in cardiac catheter ablations, a way to treat abnormal heart rhythms, and other electrophysi0logy procedures, including atrial fibrillation and atrial flutter.
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