Method and device for detecting blocked condition in a tube of a liquid infusion pump
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United States of America Patent
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-
Dec 11, 1990
Issued Date -
N/A
app pub date -
Mar 15, 1990
filing date -
Feb 17, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A detector for a blocked condition in a tube of a liquid infusion pump includes a moveable shaft which is kept in contact with the outer wall of a flexible tube for transporting a liquid therethrough and moves according to the changes in the outer diameter of the tube corresponding to changes in the internal pressure of the liquid. A magnet core is affixed to this shaft and affects the inductance of a solenoid coil which is affixed at a fixed position. A blocked condition in the tube is detected by monitoring the change in the inductance of this coil.
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