A cannula is a small, flexible tube that is inserted into the body. It is commonly used in medical procedures to provide access to a variety of areas. The cannula can be used to draw fluids from a body cavity or to inject medication or other substances into the body.
The most common type of cannula is the intravenous cannula, which is inserted into a vein and used to draw blood or to inject fluids. Intravenous cannulas are usually made of plastic and have a thin wall with a rounded tip to minimize trauma to the vein. They are available in a variety of sizes and lengths, depending on the procedure.