1. Bare stents: the earliest normal primary stents, this kind of stents only have a layer of metal, that is, there is nothing else on the stent. This kind of stent is installed in the blood vessels of the human body, and will also play a good role in supporting the blood vessels. But because the stent installed in the human blood vessels, will be endothelial cells will be crawling, that is, the endothelial cells will be wrapped up stents, due to the endothelial cells layer by layer of the package, will make the blood vessels stenosis, that is, after a period of time, often found in the coronary artery to install the stent position and stenosis.
2. Coated stent: It is also known as drug-coated stent, in which drugs that inhibit endothelial proliferation of the patient's blood vessels are usually coated in the stent coating. After installing this kind of stent, because the drug coating can effectively inhibit the patient's endothelial hyperplasia, it can also effectively reduce the patient's stent site restenosis. However, this stent also has a disadvantage, because the endothelium does not proliferate, so in the location where the stent is installed, may form due to the endothelial tear, caused by the formation of numerous micro-thrombi, micro-thrombi may cause acute reocclusion of the blood vessel.
3. Degradable stents: These stents have just appeared in recent years. After being installed in the human body, these stents will remain in the body in the early stage, and after 1-2 years, the stents will be absorbed by the human body, and when you go to do a checkup in the future, you will find that the stents have disappeared from the human body.