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Stents are small, expandable tubes typically made of metal or plastic that are used to hold open and support narrow or weakened arteries or other passageways in the body. They are often used in medical procedures to improve blood flow, prevent blockages, or provide structural support to areas such as the heart, kidneys, or other organs. Stents can be inserted into the body through minimally invasive procedures, where they are placed in position and expanded to help maintain the patency of the vessel or duct.