David John Bassin,John David Oates,Ronald James Huby,Benriah Goeldi
申请号：
US15420282
公开号：
US09782121B2
申请日:
2017.01.31
申请国别(地区):
US
年份:
2017
代理人:
摘要：
Methods and apparatus are disclosed for determining the occurrence of a closed or open apnea. Respiratory air flow from a patient is measured to give an air flow signal. The determination of an apnea is performed by applying an oscillatory pressure waveform of known frequency to a patient's airway, calculating a complex quantity representing a patient admittance (12) and comparing its value with ranges (14,16) indicative of open or closed apneas. The method distinguishes open from closed apneas even when the model used to calculate admittance is not based on details of the respiratory apparatus. In addition the patient admittance may be compared with admittance during normal breathing to avoid having to characterize the airway.
