The first bypass surgery was performed in the United States in the 1960s. The inspiration for the invention of the modern coronary or heart stent came from the failings of angioplasty. In some cases, an artery would close up again after the angioplasty balloon was removed.
Doctors wanted a way to keep arteries open permanently. The first stent was inserted in a human coronary artery in 1986, and the first stents were approved for use in the U.S. in 1994.