Flow sensor for an infusion pump

Details Flow sensor for an infusion pump Flow sensor for an infusion pump

A - Human Necessities

61

M

A61M 5/172 (2006.01) A61M 5/142 (2006.01) A61M 5/168 (2006.01) G01F 1/075 (2006.01) G01P 13/00 (2006.01)

Patent

CA 2151705

An infusion pump for delivering a selected medication to a patient is provided with an inductance flow sensor for monitoring and verifying delivery of medication in response to pump operation. The flow sensor comprises a compact inductor coil wrapped about a pump discharge conduit, in combination with a magnetically attractable core pin disposed within the discharge conduit for movement to a position within the inductor coil in response to pump outflow. A control circuit operates with minimal power requirements to monitor coil inductance changes as a result of core pin displacement to confirm medication delivery to the patient in response to pump operation. A magnet mounted at one end of the inductor coil draws and retains the core pin at a position retracted from the coil in the absence of pump outflow.

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