Stent insertion into arteries is used to improve blood flow in the patient. In this procedure, the doctor uses a catheter to place a deflated balloon into a weakened or obstructed part of the artery. Inflating the balloon helps reduce or remove the blockage. The, the stent, a small mesh metal tube, is inserted to help keep the artery open. The stent is kept in place, and the balloon and catheter are removed.