Balloon angioplasty is a minimally invasive, non-surgical endovascular procedure to widen narrowed or obstructed arteries or veins caused by plaque buildup in the vessels. During the procedure, the doctor injects contrast through a small, thin tube called a catheter into your bloodstream. The contrast allows the doctor to view your blood vessels on an X-ray monitor. A catheter with a small balloon on its tip is then inserted through an artery in your leg or arm and threaded through the arteries until it reaches the narrowed area. The balloon is inflated to flatten the plaque against the wall of the artery, opening the artery and restoring blood flow. Then the balloon is deflated and removed from your body. This allows more blood and oxygen to be delivered to the leg and feet.