Every year, a large number of patients with coronary heart disease need to undergo cardiac stent implantation, and cardiac stent is a medical device commonly used in cardiac interventional procedures, and some knowledge of stent is discussed below. 1, the rise of stents first appeared in the 1980s, has gone through the first generation of metal stents, the second generation of drug-coated stents and the latest bioabsorbable stents and other different courses, and now the most widely used is the second generation of drug-coated stents. 2.Classification of stents According to different methods, it can be divided into different kinds, for example (1) according to the different designs of stents, it can be divided into mesh stents, tubular stents, winding-type stents, ring stents. , (2) According to the different materials of stent, it can be divided into 316L stainless steel stent, nickel stent, and tantalum stent. (3) According to the different delivery methods, it is divided into balloon expandable stents and self-expandable stents. There are also domestic stents and imported stents. 3.Will the stent move when implanted in the body? No, because it fits very tightly to the vessel wall and cannot be removed. 4.Can I have an MRI after stenting? The first generation stent is made of stainless steel, and the strong magnetism of MRI may have some influence, but at present, more stents are made of cobalt-chromium alloy, nickel-pulley alloy, polymer biodegradable material, etc., and MRI will not affect them. So it can be examined at 1.5T MRI field strength without being affected. Specific need to consult a professional doctor. 5, coronary arteries can not be put, once the stent is put, you have to take medication for life. First of all, there is a standard for stent implantation, that is, generally speaking, stenosis reaches 70-75% or more, and only patients with symptomatic coronary artery disease are put into stents. Other factors such as the extent of blood supply and the presence of collateral circulation should also be taken into consideration. And even if the stent is not placed, once the diagnosis of coronary heart disease is confirmed, it is necessary to take medication for treatment. 6.Stent is not a panacea. Some stenoses require open-heart bypass surgery. Finally, it is recommended to receive standardized treatment under the advice of doctors in regular hospitals, rather than blindly trusting others or advertisements.