Arrangement for monitoring fluid flow during intravenous supply to a patient
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United States of America Patent
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-
Oct 13, 1992
Grant Date -
N/A
app pub date -
Aug 13, 1991
filing date -
Aug 13, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An arrangement for monitoring the pressure of fluid flowing through pliant tubing forming part of a system for the intravenous supply of fluids to a patient under medical treatment in which the tubing is caused to assume an elongate cross-section and a linear voltage displacement transducer having a spring loaded plunger is arranged to apply pressure in a flattened region of the tubing wall to provide indications of contact area movement and thus variations in fluid pressure. Compensation for movement of the contact area after pressure is applied due other than to variations in pressure is provided by a sampler which regularly samples the output of tranducer and provides inputs to a comparator directly and via a shift register so that one sample is compared with an immediately preceding sample. If the difference exceeds the threshold of a threshold circuit, which is indicative of fluid pressure change, an alarm is sounded.
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Family
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