US Patent No: 7,320,320

Number of patents in Portfolio can not be more than 2000

Determination of patency of the airway

ALSO PUBLISHED AS: 20040123866

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ATTORNEY / AGENT: (SPONSORED)

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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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
RESMED LIMITEDBELLA VISTA NEW SOUTH WALES848

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Berthon-Jones, Michael Leonay, AU 126 2885

Cited Art Landscape

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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
Nexense Ltd. (1)
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KONINKLIJKE PHILIPS ELECTRONICS N.V. (1)
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NIHON KOHDEN CORPORATION (1)
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* Cited By Examiner

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