A cannula is a thin, flexible tube used in medical procedures to deliver or remove fluids from the body. It is often inserted into a vein or other body cavity and can be used for various purposes, such as administering medications, fluids, or oxygen. Cannulas come in different sizes and types, depending on their specific use. In many cases, a cannula is used in conjunction with other medical devices, such as an IV (intravenous) line or a ventilator. They are essential tools in hospitals and clinics, helping healthcare professionals provide effective treatment and care to patients.