In an angioplasty, the doctor inserts a small tube (catheter) into an artery in the groin
and advances it upward into an artery of the heart. A thin wire is threaded through the
catheter and across the blockage. Another catheter with a balloon on the end is passed
over that wire and the balloon is inflated, pushing the blockage (plaque) to the side
and opening the artery for blood flow. A stent may be mounted on the balloon to keep
the artery walls open.