A stent is a small metal mesh device used to support a blood vessel. A stent is a support or scaffold that is inserted into a coronary artery to keep it open, improve blood flow to the heart muscle, and alleviate angina symptoms.

Reference-

1. Angioplasty and stent placement - heart. (n.d.). Retrieved from https://www.mountsinai.org/health-library/surgery/angioplasty-and-stent-placement-heart