Stent

What is a Stent?

In medicine, a stent is a tiny tube. It is usually made from a special metallic alloy or a strong plastic. Doctors put a stent inside a narrow or blocked tube in the body, like an artery. This helps keep the tube open so blood or other fluids can flow well. This is called stenting.

Why Are Stents Used?

Stents are used for many health issues. For example, coronary stents help open blocked blood vessels in the heart. This is done during a procedure called coronary angioplasty. Other stents can help keep tubes open in places like the kidneys, liver, or even the windpipe.

History of Stents

The idea of using a stent began with a dentist named Charles Stent in the 1800s. Doctors started using stents in the heart in 1986. Since then, they have become a very useful tool for treating many diseases and helping people stay healthier.

Stent types

By destination organ

Coronary stent

Main article: Coronary stent

Coronary stents are placed during a coronary angioplasty. They are used in the coronary arteries and can be made of metal or special materials that slowly dissolve. These stents help keep the arteries open so blood can flow properly.

Most coronary stents today release medicine to stop blood clots and prevent the artery from narrowing again. Doctors use special tools to place the stent correctly. Stents can reduce chest pain.

Vascular stent

Vascular stents help treat problems in blood vessels far from the heart, such as in the legs or neck. They are made from flexible materials to fit well in these areas. These stents keep blood flowing freely and are used to open blocked arteries.

Ureteric stent

Main article: Ureteric stent

Ureteral stents are tiny tubes placed in the tubes that carry urine from the kidneys to the bladder. They are used when a kidney stone blocks the flow of urine. These stents can be removed easily, sometimes with a special magnet.

Prostatic stent

Main article: Prostatic stent

Prostatic stents are used in men who have trouble urinating because of an enlarged prostate. They help keep the tube that carries urine open. There are temporary and permanent types.

Colon and Esophageal stents

Main article: Esophageal stent

Stents can also be used in the colon or esophagus to help keep these areas open when they are blocked by cancer or other problems. They are made of flexible materials and can ease symptoms like trouble swallowing or bowel blockages.

Pancreatic and biliary stents

Pancreatic and biliary stents help drain fluids from the gallbladder, pancreas, and bile ducts when they are blocked by stones or other issues. They are useful in treating infections and other problems.

Glaucoma drainage stent

Glaucoma drainage stents are tools that help drain fluid from the eye to reduce pressure and treat glaucoma.

By properties or function

Bare-metal stent

Main article: Bare-metal stent

Some stents are made of simple metal mesh without any extra coating. These are used to support blood vessels or other tubes in the body.

Bioresorbable stent

Main article: Bioresorbable stent

Bioresorbable stents are made from materials that slowly dissolve after they have done their job. They are used to open blocked heart arteries and then disappear.

Drug-eluting stent

Main article: Drug-eluting stent

Drug-eluting stents are special tubes that release medicine to prevent new blockages from forming in arteries. They are very common today and have helped many patients.

Etymology

The word stent comes from the name of an English dentist named Charles Thomas Stent. He was born in Brighton and improved a material called gutta-percha. This material helped make dental impressions better.

Later, a Dutch doctor named Jan F. Esser used the name to describe a material that helps hold open parts of the body during surgery. Now, "stent" means the tiny tube doctors use to keep blood vessels open.

History

The first use of a coronary stent was in 1986. Doctors Jacques Puel and Ulrich Sigwart placed a tiny tube in a patient in Toulouse, France. This tube helped keep a blood vessel open.

In 1993, the first stent approved by the U.S. FDA was made by doctors Cesare Gianturco and Gary Roubin. In 2003, a new type of stent that could release medicine was introduced. Scientists keep studying and improving stent designs to make them safer and better.