Detection of apnea and obstruction of the airway in the respirat

Details Detection of apnea and obstruction of the airway in the respirat Detection of apnea and obstruction of the airway in the respirat

1994-11-04

1998-01-06

Millin, Vincent

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820421, 12820718, 128716, 128725, A61M 1600

Patent

active

057043450

ABSTRACT:
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.

REFERENCES:
patent: 5107831 (1992-04-01), Halpern et al.

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