Dilution regulation method and device for breathing apparatus
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United States of America Patent
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Sep 14, 2004
Grant Date -
May 8, 2003
app pub date -
Sep 27, 2002
filing date -
Nov 8, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
In a method of regulating the flow rate of additional oxygen taken from a pressurized inlet for oxygen from a source and admitted into a breathing mask provided with an inlet for dilution ambient air, the ambient pressure and the instantaneous inhaled breathe-in flow rate in terms of volume reduced to ambient conditions are measured in real time. The minimum oxygen content in the complete inhalation phase in order to comply with respiratory standards is computed from the ambient pressure and the instantaneous flow rate of additional oxygen is controlled in such a manner as to satisfy the requirements of the applicable standards with a safety margin that is generally a few percent. There is also described a regulator implementing the above method.
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