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Images World`s smallest pacemaker implanted directly into patient`s heart Dr. John Hummel (left) and Dr. Ralph Augostini of The Ohio State University Wexner Medical Center are among the first in the U.S. to implant the world`s smallest pacemaker. Roughly half the size of a AAA battery, the pacemaker is designed to monitor the patient`s heart and only activate when needed. It is expected to last up to 14 years. Tiny pacemaker implanted on patient`s heart without surgery At The Ohio State University Wexner Medical Center, Dr. John Hummel (left) and Dr. Ralph Augostini use a catheter to implant a tiny pacemaker directly into the heart of a patient. The pacemaker, about half the size of a AAA battery, is 90 percent smaller than traditional models and because it has no wires, or leads, the risk of infection and malfunction is greatly reduced. New generation of pacemaker is barely bigger than a nickel Just 24 millimeters in length, a new class of pacemaker is being implanted directly into a patient`s heart. Doctors at The Ohio State University Wexner Medical Center say because the device is 90 percent smaller than current pacemaker models, it can be fed through a catheter placed in a patient`s leg and implanted without surgery. Her new pacemaker is barely bigger than one pill Mary Lou Trejo takes to control her heart condition Mary Lou Trejo, of Columbus, Ohio, marvels at the size of the pacemaker she recently had implanted at The Ohio State University Wexner Medical Center. Trejo, 77, has a history of atrial fibrillation which has weakened her heart and caused it to slow considerably. Her high-tech new pacemaker will constantly monitor her condition and will only activate when Trejo`s heart needs help beating normally. That intermittent pacing means her tiny pacemaker could last up to 14 years before needing replaced. A history of heart disease prompted Mary Lou Trejo to test the future of pacemakers Because she and several members of her family have been diagnosed with heart disease, Mary Lou Trejo of Columbus, Ohio volunteered to become one of the first patients in the U.S. to have a tiny pacemaker implanted directly into her heart. Doctors at The Ohio State University Wexner Medical Center used a catheter to put the high-tech pacemaker into Trejo`s heart where it could stay uninterrupted for up to 14 years. Implanting a tiny, high-tech pacemaker without surgery Doctors at The Ohio State University Wexner Medical Center use a catheter to place a tiny, high-tech pacemaker directly into the heart of Mary Lou Trejo, 77, of Columbus, Ohio. The pacemaker is 90 percent smaller than traditional pacemakers and because it has no leads that are fed from the upper chest into the heart, doctors say the risk of infection and complications could be cut dramatically. New pacemaker is about half the size of a AAA battery A new class of pacemaker recently implanted directly into a patient`s heart at The Ohio State University Wexner Medical Center, is the smallest in the world. Doctors say the high-tech pacemaker can constantly monitor a patient`s condition and will only activate when needed. Because of that intermittent pacing, the device can last up to 14 years and because there are no wires, or leads, like those found in traditional models, the risk of infection and complications are expected to be dramatically reduced. The Ohio State University Wexner Medical Center The Ohio State University Wexner Medical Center