Disclosed is a medical fluid infusion system configured for pumping a fluid to a patient. The system includes one or more modular pump devices, such as infusion pumps, each of which is fluidly attached to an IV bag for infusing a liquid from the IV bag to a patient through at least one fluid line. A pole assembly of the medical fluid infusion system is configured to maintain the pumps and IV bags in a vertical alignment that eliminates or minimizes variations in pumping accuracy due to head pressure between the bags and the infusion pumps.
