SYSTEMS AND /OR METHOD FOR CALIBRATION -LESS DEVICE OR LESS EXPENSIVE CALIBRATION DEVICES FOR TREATING SLEEP-DISORDERED BREATHING

• US 20100258123A1
• Filed: 06/05/2007
• Published: 10/14/2010
• Est. Priority Date: 06/05/2006
• Status: Abandoned Application

• Current Assignee: Resmed Limited (ResMed Incorporated)
• Original Assignee: Resmed Limited (ResMed Incorporated)
• Inventors: Somaiya, Chinmayee, Alder, Matthew, Thomsen, Kristian, Farrugia, Steven Paul
• Application Number:
  US12/312,489
• Publication Number:
  US 20100258123A1
• Time in Patent Office: Days
• US Class Current: 128/204.230
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 2016/0018 electrical
• CPC Class Codes: A61M 2016/0033 electrical
• CPC Class Codes: A61M 2205/3365 Rotational speed
• CPC Class Codes: A61M 2205/3375 Acoustical, e.g. ultrasonic, measuring means
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities

Abstract

Systems and/or methods for treating sleep-disordered breathing (SDB) are provided. In particular, systems and/or methods are provided that include software systems for use with auto-titrating devices (e.g. APAP devices) that reduce and/or eliminate the need to calibrate the auto-titrating devices. The software system also may reduce and/or eliminate the need for certain sensors used in such calibrations. Certain example embodiments compute snore based on noises measured during expiration and inspiration, and certain example embodiments set patient leak utilizing the vent flow level. Certain example embodiments change treatment pressure thresholds after measuring patient improvement by monitoring a variable correlated with actual delivery pressure in accordance with an example embodiment, and certain example embodiments provide pressure according to motor speed in accordance with an example embodiment.

Claims

1. A positive airway pressure (PAP) system, comprising:

a PAP device; and

,

a patient circuit, said patient circuit comprising an air delivery conduit and a patient interface unit;

wherein the PAP device is configured to deliver therapeutic treatment pressures based on a reduced calibration thereof, the reduced calibration being substantially independent of the patient circuit.

2. The PAP system of claim 1, further comprising a pressure sensor and/or a flow sensor.

50. The system of claim 1, further comprising an automatic calibration system and/or a learning system.

3. A method of delivering therapeutic treatment pressures to a patient via a positive airway pressure (PAP) device comprising an operable flow generator and a patient circuit including a patient interface unit, the method comprising:

generically calibrating the device substantially independent of a specific patient circuit used;

setting a first pressure;

providing a supply of pressurized breathable gas to the patient at or close to the first pressure;

monitoring at least one parameter indicative of a patient'"'"'s condition over a period of time to measure patient improvement; and

,

when the at least one monitored parameter indicates a lack of patient improvement, changing the first pressure.

4. The method of claim 3, further comprising determining a desired motor speed based on the first pressure.

5. The method of claim 3, further comprising controlling the first pressure by controlling a motor speed of the PAP device.

6. The method of claim 3, wherein the actual pressure delivered to the patient is not determined.

7. The method of claim 3, wherein the monitored parameter is flow limitation.

8. The method of claim 7, wherein the at least one monitored parameter indicates the lack of patient improvement by being consistently below a certain threshold.

9. The method of claim 3, wherein the at least one monitored parameter is hourly AHI.

10. The method of claim 9, wherein the at least one monitored parameter indicates the lack of patient improvement by failing to drop below a given value.

11. The method of claim 10, wherein the given value is 2.

12. The method of claim 3, wherein the at least one monitored parameter is an arousal index.

13. The method of claim 12, wherein the at least one monitored parameter indicates the lack of patient improvement by failing to fall.

14. The method of claim 3, wherein the at least one monitored parameter relates to the patient'"'"'s snore.

15. The method of claim 14, wherein the at least one monitored parameter measures noise during patient expiration.

16. The method of claim 14, further comprising considering the noise during patient expiration as intrinsic device noise.

17. The method of claim 14, wherein the at least one monitored parameter measures noise during patient inspiration.

18. The method of claim 17, further comprising comparing the noise measured during patient expiration and noise measured during patient inspiration.

19. The method of claim 18, further comprising considering the noise measured during patient inspiration in excess of the noise during expiration as patient snore.

51. The method of claim 3, further comprising adjusting the supply of pressurized breathable gas based at least in part on an automatic calibration system and/or a learning system.

57. The method of claim 51, further comprising adjusting the supply of pressurized breathable gas based at least in part on an automatic calibration system and/or a learning system.

20. A system for delivering therapeutic treatment pressure to a patient suffering from sleep disordered breathing, comprising:

a patient circuit operable to deliver the pressurized breathable gas to the patient;

a controllable flow generator operable to generate a supply of pressurized breathable gas to be delivered to the patient at a first pressure substantially independent of the specific patient circuit used;

a monitor operable to measure a parameter indicative of a patient'"'"'s condition over a period of time; and

,

a processor operable to change the controllable flow generator'"'"'s first pressure when the monitored parameter indicates a lack of patient improvement.

21. The system of claim 20, wherein the monitored parameter is flow limitation.

22. The system of claim 21, wherein the monitored parameter indicates the lack of patient improvement by being consistently below a certain threshold.

23. The system of claim 20, wherein the monitored parameter is hourly AHI.

24. The system of claim 23, wherein the monitored parameter indicates the lack of patient improvement by failing to drop below a given value.

25. The system of claim 24, wherein the given value is 2.

26. The system of claim 20, wherein the monitored parameter is an arousal index.

27. The system of claim 26, wherein the monitored parameter indicates the lack of patient improvement by failing to fall.

52. The method of claim 20, further comprising adjusting the supply of pressurized breathable gas based at least in part on an automatic calibration system and/or a learning system.

28. A method of delivering therapeutic treatment pressure to a patient via a positive airway pressure (PAP) device comprising an operable flow generator and a patient circuit including a patient interface unit, the method comprising:

generically calibrating the device substantially independent of the specific patient circuit used;

setting a first pressure;

providing a supply of pressurized breathable gas to the patient at or near the first pressure;

monitoring a parameter indicative of a patient'"'"'s condition over a period of time to measure patient improvement; and

,

when the monitored parameter indicates a lack of patient improvement changing the first pressure by adjusting an element in the PAP device to modify the amount of pressurized breathable gas provided to the patient.

29. The method of claim 28, wherein the element in the PAP device adjusted to modify the amount of pressurized breathable gas provided to the patient is the motor speed of the PAP device.

30. A system for delivering therapeutic treatment pressure to a patient suffering from sleep disordered breathing, comprising:

a patient circuit operable to deliver the pressurized breathable gas to the patient;

a controllable flow generator operable to generate a supply of pressurized breathable gas to be delivered to the patient at a first pressure substantially independent of the specific patient circuit used;

a monitor operable to measure a parameter indicative of a patient'"'"'s condition over a Period of time; and

,

a processor operable to change the controllable flow generator'"'"'s first pressure and an element of the controllable flow generator;

wherein the processor changes the first pressure and the element of the controllable flow generator when the monitored parameter indicates a lack of patient improvement.

31. The method of claim 30, wherein the element in the controllable flow generator used to modify the amount of pressurized breathable gas provided to the patient adjusted is the motor speed of the controllable flow generator.

32. A method of classifying mask leak for a patient using a positive airway pressure (PAP) device, the method comprising:

providing a supply of pressurized breathable gas to the patient at a first pressure;

estimating vent flow based on the first pressure;

determining the average value of flow;

determining the mask leak based on the average value of flow and the estimated vent flow; and

,

classifying the mask leak according to at least one predetermined mask leak threshold.

33. The method of claim 32, wherein mask leak above the at least one mask leak threshold is classified as high.

34. The method of claim 33, wherein the mask leak below the at least one mask leak threshold is classified as low.

35. The method of claim 33, wherein there is a plurality of predetermined mask leak thresholds.

36. The method of claim 32, further comprising logging the mask leak classification level.

40. A method of treating a patient via a positive airway pressure (PAP) device, the method comprising:

classifying mask leak using the method of claim 32;

monitoring at least one parameter indicative of a patient'"'"'s condition over a period of time to measure patient improvement; and

changing the PAP device first pressure when the monitored parameter indicates a lack of patient improvement.

43. The method of claim 40, wherein the PAP device first pressure is changed when the monitored parameter indicates a lack of patient improvement and the mask leak is classified below at least one predetermined mask leak threshold.

53. The method of claim 35, further comprising adjusting the supply of pressurized breathable gas based at least in part on an automatic calibration system and/or a learning system.

37. A system for treating a patient suffering from sleep disordered breathing, comprising:

a patient circuit configured to deliver pressurized breathable gas to the patient;

a controllable flow generator operable to generate the pressurized breathable gas to be delivered to the patient at a first pressure independent of the specific patient circuit used;

a processor configured to estimate the PAP device'"'"'s vent flow based on the first pressure, determining the average value of flow, determining the mask leak based on the average value of flow and the estimated vent flow, and classifying the mask leak according to at least one predetermined mask leak threshold; and

,

a monitor operable to measure a parameter indicative of a patient'"'"'s condition over a period of time;

wherein the processor is operable to change the controllable flow generator'"'"'s first pressure when the monitored parameter indicates a lack of patient improvement.

38. The system of claim 37, wherein the mask leak is classified as high or low.

41. The system of claim 37, wherein the processor is operable to change the controllable flow generator'"'"'s first pressure when the monitored parameter indicates a lack of patient improvement and the mask leak is classified below at least one predetermined mask leak threshold.

54. The system of claim 37, further comprising an automatic calibration system and/or a learning system.

39. A method of treating a patient via a positive airway pressure (PAP) device, the method comprising:

providing a supply of pressurized breathable gas to the patient at a first pressure;

estimating vent flow based on the first pressure;

determining the average value of flow;

determining the mask leak based on the average value of flow and the estimated vent flow;

classifying the mask leak according to at least one predetermined mask leak threshold;

monitoring at least one parameter indicative of a patient'"'"'s condition over a period of time to measure patient improvement; and

,

when the monitored parameter indicates a lack of patient improvement, changing the PAP device first pressure.

42. The method of claim 39, wherein the PAP device first pressure is changed when the monitored parameter indicates a lack of patient improvement and the mask leak is classified below at least one predetermined mask leak threshold.

44. A method of treating a patient suffering from sleep-disordered breathing, the method comprising:

setting a first pressure;

providing a supply of pressurized breathable gas to the patient at or close to the first pressure via a controllable flow generator;

monitoring a parameter indicative of a patient'"'"'s condition over a period of time to measure treatment efficacy; and

,

when the monitored parameter indicates a change in treatment efficacy, changing the first pressure.

45. The method of claim 44, further comprising adjusting an aggressiveness and/or gentleness associated with the treatment based at least in part on the change in treatment efficacy.

46. The method of claim 44, wherein the monitored parameter is flow limitation.

47. The method of claim 44, wherein the monitored parameter is hourly AHI.

48. The method of claim 44, wherein the monitored parameter is an arousal index.

49. The method of claim 44, wherein the monitored parameter is a patient'"'"'s snore.

55. The system of claim 44, further comprising an automatic calibration system and/or a learning system.

56. The method of claim 46, further comprising adjusting the supply of pressurized breathable gas based at least in part on an automatic calibration system and/or a learning system.