With a syringe infusion pump, the liquid stays in a reservoir of a syringe. The fluid will move into the circulatory system thanks to a moveable piston, which is responsible for controlling the delivery. When the patient needs to have their medicine, the piston will deploy and the syringe will push the medicine into the patient’s body. They typically use small volume pumps for this type of infusion, and they use a motor turning a screw, controlled by a computer, to press the plunger on the syringe.