Medical device maker St. Jude Medical on Monday began deploying software designed to protect its remote monitoring system for implantable pacemaker and defibrillator devices. The move came on the heels of the U.S. food and Drug Administration’s warning that the company’s Merlin@home Transmitter contained vulnerabilities that could be exploited by hackers. Merlin@home wirelessly communicates with implanted cardiac devices. It gathers data and sends it to a physician over the Merlin.net Patient Care Network.