In April 1966, he was hired away from Sperry Rand by Earl Bakken, CEO of Medtronic as a Sales Engineer. Adducci was the ninetieth employee at the time. While at Medtronic he served in various technical and marketing responsibilities including, sales administration manager, and pacemaker consulting specialist. He taught surgeons around the United States in the basics of how pacemakers work, the physiology of the cardiovascular system and the instructions to insert the pacemaker into the body. Adducci was involved in over fifty surgeries while at Medtronic.