Image Caption : Stent with Umbrella Filter : An angioplasty in the carotid arteries can pose the very serious risk of creating embolisms, tiny blood clots, which may travel to the smaller blood vessels of the brain. There they can become lodged and cause a stroke. To guard against this, a tiny umbrella-like filter can be attached to the stent, a coil of wire mesh used to expand the blocked vessel. At the end of the stenting procedure, the filter and its debris are removed from the artery.
What Is a Stent?
A stent is a small mesh tube that's used to treat narrow or weak arteries. Arteries are blood vessels that carry blood away from your heart to other parts of your body.
A stent is placed in an artery as part of a procedure called percutaneous coronary intervention (PCI), also known as coronary angioplasty. PCI restores blood flow through narrow or blocked arteries. A stent helps support the inner wall of the artery in the months or years after PCI.
Doctors also may place stents in weak arteries to improve blood flow and help prevent the arteries from bursting.
Stents usually are made of metal mesh, but sometimes they're made of fabric. Fabric stents, also called stent grafts, are used in larger arteries.
Some stents are coated with medicine that is slowly and continuously released into the artery. These stents are called drug-eluting stents. The medicine helps prevent the artery from becoming blocked again.
National Heart, Lung and Blood Institute / NIH
In medicine, a stent is a tube or other device placed in the body to create a passage between two hollow spaces, and stenting is the placement of a stent. There is a wide variety of stents used for different purposes, from expandable coronary, vascular and biliary stents, to simple plastic stents used to allow the flow of urine between kidney and bladder. Stent is also used as a verb to describe the placement of such a device, particularly when a disease such as atherosclerosis has pathologically narrowed a structure such as an artery.
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