In recent years, cardiac stent intervention has become a new trend in the treatment of coronary heart disease, and people are no longer unfamiliar with the term cardiac stent. Cardiac stent is a universal and representative device in the treatment of heart diseases. Compared with surgical procedures, cardiac stent intervention is a delicate art of cardiologists “threading the needle”, as it is non-invasive, less invasive and faster recovery. The large arteries of the human body emanate from the heart and gradually divide into various levels of arteries to supply each limb and organ, then disperse into small arteries and capillaries, then converge into veins, and the veins of the whole body then converge and return to the heart through large veins. In other words, every blood vessel in the body is directly or indirectly connected to the heart. It can be seen that the blood vessels of human body are the natural channels to the heart, and the interventional surgery is performed through tiny catheters to reach the lesion site through the blood vessels, so as to complete the diagnosis and treatment. 1. Establishing a “channel” First, we need to establish a channel to enter the blood vessel. This is usually done by directly puncturing the vessel with a special needle, similar to a needle. The most common choice is the radial artery in the wrist or the femoral artery in the inner thigh. 2. Place the guidewire Then, the wire is placed along the needle, at which point the needle can be withdrawn, leaving the wire in the vessel. Using the wire as a skeleton, the surgeon places a sheath to create a channel through which the guide wire and catheter can be passed deep into the heart until it reaches the coronary artery. The guidewire is not an ordinary metal wire, but an extremely thin and precise material, which is soft and the tip can be flexed and turned by the physician to cross the path from a large blood vessel thicker than a thumb to a coronary artery thinner than an I strip. The catheter is then able to follow the path of the guidewire as it winds its way through the vessel. 3.Angiography In the process of reaching the destination, the doctor needs to observe the situation through X-ray fluoroscopy, and also needs to push in the “contrast” through the catheter to clearly show the blood vessel under the X-ray and find the lesion site. 4. Inserting the balloon and stent Following the catheter, the doctor delivers a balloon wrapped with a metal stent into the vessel at the site of the lesion, inflates the balloon, and uses about 10 times the atmospheric pressure to hold the metal stent open. This stent, once placed, retains its shape for life and permanently supports the stenosis. In order to avoid the growth of blood clots on the bare metal, which can cause stenosis and obstruction again, the new generation of stents has a drug coating or even a biological coating on the surface, which greatly reduces the incidence of restenosis. These are the main procedures of heart stent installation. Although it does not look complicated, it requires a very high level of competence for medical institutions and physicians. Especially for patients who have suffered myocardial infarction, are in critical condition, and need emergency care, the ability to open the obstructed blood vessel as soon as possible is the key to saving the patient’s life and health. A hair-thin wire pulling a small metal stent, placed in the blocked heart vessels, can save the ischemic heart muscle, so that patients who may die suddenly at any time no longer hanging on the line, these links once the problem, may endanger the lives of patients, doctors do heart stent surgery relies on not only careful and meticulous, but also requires a wealth of experience.