Oct. 9, 2014 - New Investigational Cardiac Pacemaker As Small As A Vitamin | One-tenth the size of a conventional pacemaker, Medtronic Micra™ Transcatheter Pacing System (TPS) is delivered directly into the heart through a catheter inserted in the femoral vein (groin). Once positioned, the pacemaker is securely attached to the heart wall and can be repositioned or retrieved if needed.