Determination of leak during CPAP treatment
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United States of America Patent
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Aug 9, 2016
Grant Date -
Oct 24, 2013
app pub date -
May 1, 2013
filing date -
Aug 30, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A respiratory treatment apparatus and method in which a leak is determined by using an averaging window. The window starts at the present time and extends back in time to a point determined according to a current one of progressively detected phase measures of a first respiratory cycle and a corresponding phase measure attributable to a preceding second respiratory cycle. In another aspect, a jamming index indicates whether the leak is rapidly changing. To the extent that jamming is high, the leak estimate used progressively changes from that using sliding breath-window averaging to a more robust and faster responding low-pass filter method, and adjustment of ventilatory support based on measures employing estimated respiratory flow is slowed down or stopped.
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