Balloon angioplasty is a procedure that widens a narrow or obstructed blood vessel using a balloon catheter. It is used to treat atherosclerosis (blood vessel obstructions). This is commonly performed as a minimally-invasive (percutaneous) procedure.
A stent (small mesh tube) is sometimes implanted to keep the artery walls expanded. The stent initially is inserted along with the balloon catheter, expands when the balloon is inflated, and left behind in the expanded position as the balloon catheter is removed.