Determination of apnea/hypopnea during CPAP treatment
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61M-016/00
A61B-005/087
A61B-005/00
A61M-016/06
A61M-016/08
출원번호
US-0558835
(2014-12-03)
등록번호
US-10183136
(2019-01-22)
발명자
/ 주소
Alder, Matthew
Farrugia, Steven Paul
Somaiya, Chinmayee
출원인 / 주소
ResMed Limited
대리인 / 주소
Botos Churchill IP Law LLP
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
CPAP treatment apparatus is disclosed having a controllable positive airway pressure device. A sensor generates a signal representative of patient respiratory flow that is provided to a controller. The controller is operable to determine the occurrence of an apnea from a reduction in respiratory air
CPAP treatment apparatus is disclosed having a controllable positive airway pressure device. A sensor generates a signal representative of patient respiratory flow that is provided to a controller. The controller is operable to determine the occurrence of an apnea from a reduction in respiratory airflow below a threshold determined from long term ventilation. When an apnea or hypopnea has occurred the calculation of the threshold is suspended until the end of that event.
대표청구항▼
1. An apparatus for detecting occurrence of either or both of apnea and hypopnea events in a patient comprising: a sensor for sensing respiratory flow;a first filter to iteratively calculate a first average respiratory airflow over a first time interval;a second filter to iteratively calculate a sec
1. An apparatus for detecting occurrence of either or both of apnea and hypopnea events in a patient comprising: a sensor for sensing respiratory flow;a first filter to iteratively calculate a first average respiratory airflow over a first time interval;a second filter to iteratively calculate a second average respiratory airflow over a second time interval, the second time interval being shorter than the first time interval; anda controller in communication with said sensor and the first and second filters, the controller programmed to iteratively: calculate a predetermined fraction of the first average respiratory airflow;compare the second average respiratory airflow to the predetermined fraction of the first average respiratory airflow;determine a commencement of an apnea or hypopnea event based on the comparison;continue to calculate the second average respiratory airflow to confirm an occurrence of the apnea or hypopnea event;wherein confirming an occurrence comprises: maintaining a first value representing a number of times the second average respiratory airflow is less than the predetermined fraction of the first average respiratory airflow;maintaining a second value representing a number of times the second average respiratory airflow is not less than the predetermined fraction of the first average respiratory airflow; andcomparing the first value to the second value; a controllable positive airway pressure device operable to produce breathable gas at a treatment pressure, wherein the controller is further programmed to adjust the treatment pressure based on determining the occurrence of the apnea or hypopnea event. 2. The apparatus of claim 1, wherein the predetermined fraction is approximately ¼. 3. The apparatus of claim 1, wherein the predetermined fraction is approximately ½. 4. The apparatus of claim 1, wherein the controller is programmed to determine the commencement of the apnea or hypopnea event when the second average respiratory airflow is less than the predetermined fraction of the first average respiratory airflow. 5. The apparatus of claim 1, wherein the controller is further programmed to detect an end of the apnea or hypopnea event by determining when the second average respiratory airflow remains above the predetermined fraction of the first average respiratory airflow. 6. The apparatus of claim 1, wherein the first time interval is a one hundred seconds time constant. 7. The apparatus of claim 6, wherein the first time interval is initially set to a shorter time constant to allow a correct average respiratory airflow value to be determined faster. 8. The apparatus of claim 1, wherein the first average respiratory airflow is initially preset to a predetermined value. 9. The apparatus of claim 8, wherein the predetermined value is approximately 7.5 liters per minute. 10. The apparatus of claim 1, wherein the second time interval is a period of less than ten seconds. 11. The apparatus of claim 10, wherein the second time interval is a period of at least five seconds. 12. The apparatus of claim 11, wherein the second time interval is eight seconds. 13. The apparatus of claim 1, wherein the controller is programmed to record a number of apnea and/or hypopnea events that have occurred. 14. The apparatus of claim 1, wherein at least one of the first and second filters is an infinite impulse response (IIR) filter. 15. The apparatus of claim 1, wherein upon confirming the occurrence of an apnea or hypopnea event, the controller is further programmed to determine patency of an airway using a forced oscillation method and to classify the airway based on the determined patency as a closed airway, a partially obstructed airway or an open airway. 16. The apparatus of claim 1, wherein the controller is further programmed to, upon determining the commencement of an apnea or a hypopnea event, suspend calculation of the first average respiratory airflow until the apnea ends or the hypopnea ends. 17. A method for detecting an occurrence of an apnea or a hypopnea event with a continuous positive airway pressure (CPAP) device including a programmed controller, comprising: obtaining data indicative of a person's respiratory airflow;iteratively calculating a first average respiratory airflow over a first time interval;iteratively calculating a second average respiratory airflow over a second time interval, the second time interval being shorter than the first time interval;calculating a predetermined fraction of the first average respiratory airflow;comparing the second average respiratory airflow to the predetermined fraction of the first average respiratory airflow;determining a commencement of an apnea or hypopnea event based on the comparison;continuing to calculate the second average respiratory airflow to confirm occurrence of the apnea or hypopnea event;wherein confirming an occurrence comprises: determining a first value representing a number of times that the second average respiratory airflow is less than the predetermined fraction of the first average respiratory airflow over a period of time;determining a second value representing a number of times that the second average respiratory airflow is not less than the predetermined fraction of the first average respiratory airflow over the period of time; andcomparing the first value to the second value; supplying a breathable gas to the person's airway at a treatment pressure; and adjusting the treatment pressure based on determining the occurrence of the apnea or hypopnea event. 18. The method of claim 17, wherein the predetermined fraction is approximately one quarter. 19. The method of claim 17, wherein the predetermined fraction is approximately one half. 20. The method of claim 17, wherein the commencement of the apnea or hypopnea event is determined when the second average respiratory airflow is less than the predetermined fraction of the first average respiratory airflow. 21. The method of claim 17, further comprising detecting an end of the apnea or hypopnea event by determining when the second average respiratory airflow remains above the predetermined fraction of the first average respiratory airflow. 22. The method of claim 17, wherein the first time interval is a one hundred seconds time constant. 23. The method of claim 22, wherein the first time interval is initially set to a shorter time constant to allow a correct average respiratory airflow value to be determined faster. 24. The method of claim 17, wherein the first average respiratory airflow is initially preset to a predetermined value. 25. The method of claim 24, wherein the predetermined value is approximately 7.5 liters per minute. 26. The method of claim 17, wherein the second time interval is a period of less than 10 seconds. 27. The method of claim 26, wherein the second time interval is a period of at least 5 seconds. 28. The method of claim 27, wherein the second time interval is 8 seconds. 29. The method of claim 17, further including: scoring by the controller the occurrence of an apnea or hypopnea, andrecording by the controller a number of apnea and/or hypopnea events that have occurred. 30. The method of claim 17, further including: wherein either the first average respiratory airflow or the second average respiratory airflow or both are calculated using an infinite impulse response (IIR) filter. 31. The method of claim 17, wherein upon confirming the occurrence of an apnea or hypopnea event, further including: determining, by the controller, patency of an airway using a forced oscillation method, andclassifying, by the controller, the airway based on the determined patency as a closed airway, a partially obstructed airway or an open airway. 32. The method of claim 17, further comprising suspending, upon determining the commencement of an apnea or a hypopnea event, the calculation of the first average respiratory airflow until the apnea ends or the hypopnea ends.
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이 특허에 인용된 특허 (9)
Berthon-Jones, Michael; Farrugia, Steven Paul, Administration of CPAP treatment pressure in presence of apnea.
Sullivan Colin E. (Sidney AUX) Lynch Christopher (Sidney AUX), Device and method for monitoring breathing during sleep, control of CPAP treatment, and preventing of apnea.
Daniels Rich H. ; DelFavero John R. ; Feldman Barry J. ; Gunneson Paul B. ; Jaffe Michael B. ; Wigforss Eric P., Respiratory profile parameter determination method and apparatus.
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