The FDA approved the Palmaz-Schatz Balloon-Expandable Stent as a medical device to unblock and keep open obstructed heart arteries. The unexpanded stent is mounted over an angioplasty balloon and moved into position inside a blockage site using a catheter. When the balloon inflates within the artery, the Palmaz-Schatz stent expands with it. Then, after the balloon is removed, the stent remains permanently in place. This was the first stent approved by the FDA.