Determination of patency of the airway

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United States of America Patent

PATENT NO 7320320
APP PUB NO 20040123866A1
SERIAL NO

10737267

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Abstract

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Methods and apparatus for determining the occurrence of an apnea, patency and/or partial obstruction of the airway are disclosed. Respiratory air flow from a patient is measured to give an air flow signal. The determination of an apnea is performed by calculating the variance of the air flow signal over a moving time window and comparing the variance with a threshold value. One determination of partial obstruction of the airway is performed by detecting the inspiratory part of the air flow signal, scaling it to unity duration and area and calculating an index value of the amplitude of the scaled signal over a mid-portion. Alternatively, the index value is a measure of the flatness of the air flow signal over the mid-portion. One determination of patency of the airway is performed by applying an oscillatory pressure waveform of known frequency to a patient's airway, calculating the magnitude of the component of said air flow signal at the known frequency induced by the oscillatory pressure waveform and comparing the calculated magnitude with a threshold value. Alternatively, the air flow signal is analysed to detect the presence of a component due to cardiogenic activity.

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Patent Owner(s)

Patent OwnerAddress
RESMED LIMITED1 ELIZABETH MACARTHUR DRIVE BELLA VISTA NEW SOUTH WALES 2153

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Berthon-Jones, Michael Leonay, AU 96 5047

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