how is a stent put into the heart?
 Stent: This is a small tube that acts as a scaffold to support the inside your coronary artery. A balloon catheter, placed over a guidewire, puts the stent into your narrowed coronary artery. Once in place, the balloon is inflated, and the stent expands to the size of the artery and holds it open. The balloon is then deflated and removed while the stent stays in place. 