How Artificial Heart Was Used in Surgery--This schematic diagram shows how blood flowing into a human heart was detoured into a mechanical heart and then pumped back into the body, by-passing the left side of the heart. A 41-year-old man recently underwent heart surgery using the machinery for a 50-minute operation. Medical researchers said they believed it was the first known instance of a patient's survival through the use of an artificial heart mechanism. Surgery was performed on a valve in the left ventricle. by Associated Press