Developed by engineers from Northwestern University, the pacemaker is the size of a grain of rice and could help save babies born with heart defects.

Engineers at Illinois' Northwestern University have developed the tiniest pacemaker you'll ever see. It's several times smaller than a regular pacemaker, and it's designed for patients several times smaller than the average pacemaker user.

When the pacemaker wires were later removed, Armstrong suffered internal bleeding — an outcome more common than many patients realize. Now, engineers at Northwestern University have developed what could have saved Armstrong’s life: the world’s smallest pacemaker,