Capacitance-type fluid level sensor for i.v. and catheter bags
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United States of America Patent
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-
Aug 4, 1992
Grant Date -
N/A
app pub date -
Feb 25, 1991
filing date -
Feb 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitance-type fluid level sensing system, method, and device is disclosed for determining the amount of fluid in a container, for example, a disposable plastic bag used for intravenous (i.v.) injection or collection of waste from a human body (catheter). In one illustrated embodiment, conductive plates are disposed on the outside of the plastic bag and connected to a circuit for detecting any change in the capacitance of the capacitor formed thereby. In another embodiment, the conductive plates are integrally constructed as part of a surface of the electronic device housing, such that the fluid level can be detected when the housing is affixed directly to the outside of the bag. Alternative annunciation, detection, flow rate calculation, display, and housing features are shown in various embodiments.
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