Iv cannula is a vital medical device used to access the bloodstream for various therapeutic purposes. Typically made of flexible, biocompatible materials, the cannula is inserted into a vein, often in the arm or hand, allowing for the direct administration of fluids, medications, and nutrients. IV cannulas come in various sizes, known as gauges, with smaller numbers indicating larger diameters. This versatility enables healthcare providers to select the appropriate size based on the treatment required and the patient’s condition. They can be categorized into peripheral IV cannulas for short-term use, central venous catheters for long-term access, and midline catheters for intermediate needs