Abstract: An infusion pump for infusing solutions from IV bags, particularly large one liter bags, through tubing to patients includes housing that has a compartment to receive an IV bag in a solution-dispensing position. The bag rests over a bladder within the compartment, and the bladder is expanded by a pressurized fluid to apply a pushing force against the bag to force solution through the tubing at a prescribed pressure. The fluid for the bladder is pressurized by a pump controlled by a control circuit that includes a pressure sensor sensing pressure of the fluid in the bladder. A preferred form of the infusion pump includes a high-pressure gas cartridge in a parallel and redundant system for applying pressure in the bladder.

Abstract: An infusion pump for infusing solutions from IV bags through tubing to patients. The pump comprises a housing having a compartment which receives an IV bag in a solution-dispensing position. The bag is placed over a bladder within the compartment, and the bladder is expanded by a pressurized fluid to apply a pushing force against the bag which collapses to infuse solution through the tubing. A pump in the housing pumps a fluid such as air into the bladder under influence of a control circuit. A pressure sensor indirectly senses pressure of fluid in the bladder through a pressure of pad which contacts the bladder wall. A control circuit generates a pressure signal responsive to movement of the pressure pad for operating a valve which directs fluid between the pump and bladder. A dispensing spike is provided for interconnecting a dispensing port of the bag in fluid communication with the tubing.

Abstract: A portable infusion pump for infusing solutions from IV bags. The pump includes a housing having a compartment for removably receiving the bag in a solution-dispensing position. A push plate is mounted on the upper end of a flexible bladder having an outer wall which encloses a pressure chamber. The fluid is moved from a reservoir by a peristaltic pump into the pressure chamber so that the bladder is expanded to move the pressure plate toward the IV bag for dispensing the solution through IV tubing to the patient. The bladder has a predetermined configuration so that the differential volume required to fully dispense the solution from the IV bag is less than about 75% of the volume which is swept by movement of the push plate through its full stroke length. The IV tubing is connected to the IV bag by a filling spike having an annular groove which registers with a lock structure on the end of a lid. The lid is manually opened for insertion and removal of the bag to and from the housing compartment.

Abstract: An infusion pump for use with standard pre-filled single dose IV bags. The pump includes an inflatable chamber having a diaphragm which expands under fluid pressure to compress the sidewalls of an IV bag. A fluid is directed under pressure to the chamber for causing it to inflate under influence of a control system. In one embodiment the fluid comprises a liquid which is transferred to and from the chamber from a reservoir. In another embodiment the fluid comprises a gas.

Abstract: An infusion pump for use with standard pre-filled single dose IV bags. The pump includes a housing having a lid which opens and closes so that the IV bag can be inserted and supported in a delivery mode position. A platen surface is positioned along one side of the bag while a compression roller is mounted for movement along the other side of the bag. A control circuit actuates drive means which moves the compression roller in a direction towards a dispensing port of the bag while the roller applies force for expelling solution from the bag. Forward movement of the pressure roller is controlled to maintain solution pressure within the bag at a predetermined level. Electromechanical indicators, alarms and interlock features are provided for purposes of safety and for monitoring the infusion process.