A stent is a small, expandable mesh tube that a physician places inside a narrowed or blocked passage in the body — most often an artery — to hold it open and restore flow. Once deployed, the stent stays permanently, acting as a scaffold that keeps the vessel from collapsing or re-narrowing. Stents are among the most common implants in modern medicine, used in the heart, legs, kidneys, bile ducts, and more. This guide explains how a stent works, the main types, what the procedure involves, and what life looks like afterward.
What Does a Stent Do?
A stent props open a passage that has narrowed — usually an artery narrowed by plaque, or a duct blocked by a stone or tumor. In a coronary artery, it restores blood flow to the heart muscle and relieves the chest pain of blocked arteries; in the leg arteries it treats peripheral arterial disease; in the ureter or bile duct it keeps urine or bile draining. The stent is delivered collapsed on a catheter, positioned at the narrowing under imaging, then expanded so it presses the walls open and stays there.
Main Types of Stent
The most important distinction in artery stents is the coating. A bare-metal stent is a plain metal scaffold. A drug-eluting stent is coated with a medication released slowly to prevent the treated segment from re-narrowing (restenosis) — today's default for most coronary work. Beyond arteries there are self-expanding stents for larger or moving vessels, covered stent grafts for aneurysms and leaks, and dedicated venous, ureteral, and biliary stents engineered for those specific environments. INVAMED's Atlas coronary stent family and broader stent portfolio span these categories.
How the Stent Procedure Works
Most stents are placed by a catheter, not open surgery. Through a small puncture in the wrist or groin, a thin catheter is guided to the narrowing; a balloon is inflated to open the vessel, and the stent expands into place. The procedure typically takes under an hour, and many patients go home the same or next day. It is far less invasive than bypass surgery, which is why stenting is first-line for many blockages.
Life After a Stent
Most people return to normal activity within days. Two things matter for the long term: medication — antiplatelet drugs are prescribed to keep the stented segment clear, and taking them exactly as directed is critical — and lifestyle, since the stent fixes one narrowing but does not cure the underlying disease. With good medical follow-up, a stent does not shorten life expectancy; outcomes are driven by the underlying condition and how well risk factors are managed, not by the stent itself.
Frequently Asked Questions
How long does a stent last?
A stent is a permanent implant designed to stay for life. The treated segment is monitored, and a small minority of patients need a repeat procedure if narrowing recurs.
How many years does a patient live after a stent?
A stent itself does not limit life expectancy. Long-term outlook depends on the underlying disease, medication adherence, and lifestyle — many people live decades after stenting.
Is stent placement major surgery?
No — most stents are placed through a catheter via a small wrist or groin puncture, without open surgery, usually as a day procedure.
What are the main types of stent?
Bare-metal and drug-eluting artery stents, self-expanding and covered stents for larger vessels and aneurysms, and dedicated venous, ureteral, and biliary stents.
This article is for education only and is not medical advice, diagnosis, or treatment — always consult a qualified physician. Device availability and regulatory status vary by country.