Flow sensor for an infusion pump
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United States of America Patent
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-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Jun 14, 1994
filing date -
Jun 14, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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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