The stent is inserted into the artery with the balloon-tip catheter. When the stent is correctly positioned in the coronary artery, the balloon is inflated, expanding the stent against the walls of the coronary artery.
They are arteries which pump blood to the heart itself, as apposed to inside the heart to be pumped out again. They are elastic arteries as opposed to muscular arteries.
A stent is best described as a tiny metal scaffold that holds open coronary arteries to prevent atherosclerosis and therefore heart attacks (in that artery only). They actually look a little bit like...