Breathing apparatus with monitored delivery device
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United States of America Patent
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May 11, 2021
Grant Date -
Jun 2, 2016
app pub date -
Feb 8, 2016
filing date -
Nov 16, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A breathing apparatus has a first delivery device for adding a volume of a substance to a gas flow, the delivery device having a gas inlet and a gas outlet. A unit monitors a presence of the substance in a gas downstream the delivery device using a first sensor unit at the gas outlet that provides a first measurement value based on an acoustic property of a gas in a first conduit. A second sensor unit at the gas inlet provides a second measurement value based on an acoustic property of a gas present in the second conduit. A control unit determines the presence of the substance based on the first measurement value or based on a comparison of the first measurement value and the second measurement value.
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