As a special “commodity”, the stent has the same shelf life as other medical devices before implantation into the human coronary artery, generally ranging from 2 to 3 years. More patients may be concerned about the shelf life of the stent after it is placed into the coronary artery. Strictly speaking, as a device approved by the government administration for implantation into the human body, the physical and physical properties of the stent do not change after implantation into the human body. Therefore, once the stent is implanted in the coronary artery, there is no problem of shelf life.