For patients with cardiac stents, a common clinical question is: Do cardiac stents have a lifespan? How many years will a stent last? The answer may be that it can last for decades, or it may only last for a few months. Cardiac stents first appeared in the 1980s, and have gone through several stages of metal stents, drug-coated stents, and biodegradable stents, with stainless steel, nickel-titanium alloy, or cobalt-chromium alloy as the main materials. The main materials are stainless steel, nickel-titanium alloy or cobalt-chromium alloy. At present, the main stent used in China is the stent made of drug-coated metal with a mesh tubular structure, and the stent will not be shattered or dislodged after implantation (except for the degradable stent). After the stent is implanted into the coronary artery, it takes about 4 weeks for the stent to be covered by the endothelium in some patients, and in the vast majority of patients, the endothelium completely covers the metal stent trabeculae within 1 year, and then the stent becomes a part of the human blood vessel wall, and it will always play a role in supporting the blood vessel. The patient’s condition determines how long the stent can be used. How many years the stent can be used mainly depends on the patient’s own condition after the operation. If there is no regular treatment after the operation, and the bad lifestyle fails to be changed, the stent restenosis or in-stent thrombosis may occur very soon, and re-intervention treatment is needed. If the patient has good compliance, takes medication on time and has regular follow-ups, the stent will last much longer. Different stents are used for different periods of time. The restenosis rates of different stents are different. In the early years, cardiac stents were all “bare metal stents”, which would stimulate the overgrowth of the endothelium of the blood vessels after being put into the blood vessels, causing the endothelium on the surface of the stent to gradually thicken, and even causing the blood vessels that had been opened up by the stent to stenosis again, which is known as “restenosis” in medical terms. “Restenosis. The restenosis rate of “bare metal stent” is as high as 20%~30%. The restenosis rate of drug-coated stent is low, one year after the operation, the restenosis rate of stent is about 5% in common patients, and the restenosis rate of diabetic patients is 10% or higher. So even if regular and on-time use of antiplatelet drugs, statin lipid-lowering drugs, there is a small probability of restenosis problems every year. Biodegradable stents do not have this problem. Therefore, after all coronary stenting, it is important to take regular medication on time, control blood pressure, blood lipids, blood sugar, and change the bad lifestyle in order to make the stent last longer.