Infusion pump

Details Infusion pump Infusion pump

A - Human Necessities

61

M

128/84

A61M 5/00 (2006.01)

Patent

CA 1309914

INFUSION PUMP ABSTRACT An infusion pump for administering fluid from a fluid source to a patient comprises a base member having an electric motor for driving a fluid pump housed within a cassette detachably mountable on the base and connectable to the motor. The cassette houses a reciprocative piston and cylinder assembly which both pumps fluid to the patient while simultaneously drawing fluid from the fluid source so as to maintain a contin- uous flow rate of fluid to the patient. The cassette also houses deformably closable pairs of tubes con- necting each of the pump's two fluid chambers to the cassette inlet and outlet, respectively, to provide the necessary valving to produce continuous flow in coop- eration with the reciprocative piston and cylinder assembly. The fluid flow rate is adjustably controlled by a microcomputer which regulates the motor by repeat- edly initiating electric motor driving pulses at a pre- determined time rate, and terminating them in response to the advancement of the motor beyond one of a plurality of predetermined positions so as to maximize accuracy and reliability of flow rate while compatibly maximizing the power efficiency of the motor for portable applications requiring a battery power source.

602572

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