Percutaneous transluminal coronary angioplasty (PTCA) is a method of percutaneous puncture. The balloon catheter is retrograde to the diseased coronary artery through the artery, and the balloon is pressurized to expand the narrow coronary artery, so as to expand the lumen of the vessel, increase the blood supply of the myocardium, alleviate the lack of blood in the coronary artery, and prevent the occurrence of myocardial infarction. With the maturity of this technology and the application of coronary stent, it can not only treat the patients with angina, but also for the patients with acute myocardial infarction, direct PTCA can greatly reduce the mortality, and has become an important means of treating coronary heart disease.