A heart artery stent that is put in place surgically is inside your body permanently and is designed to last the rest of your life.
The heart artery stent will likely outlast yourself and still be inside you when you die unless you have it removed when you die.
The heart artery stent is a tiny, expandable mesh tube made of medical-grade stainless steel or cobalt alloy metal.
Sometimes you might have to go back into the hospital to have it checked out and make sure it's working correctly or have it unclogged etc.
But the artery stent will not need replaced once it's put inside your arteries.