Infusion pumps are medical devices that deliver fluids, medications, and nutrients into a patient's body in controlled amounts. There are various types of infusion, including continuous, intermittent, patient-controlled, and total parenteral nutrition, each suitable for different therapeutic needs. Infusion pumps vary in design and function, including large volume pumps, PCA pumps, elastomeric devices, syringe drivers, enteral pumps, and insulin pumps.