Stent implantation is a medical procedure used to open narrowed or blocked blood vessels, often due to atherosclerosis. A stent, which is a small mesh tube, is inserted into the affected area to keep the vessel open, allowing for improved blood flow. This procedure is commonly performed in the coronary arteries of the heart. During the procedure, a doctor typically uses a thin tube called a catheter, which is guided through the blood vessels to the blockage site. Once in place, the stent is expanded, either by inflating a balloon or through self-expansion, and remains in the vessel to provide support and prevent future blockages.