Systems and methods for controlling breathing rate

• US 7,556,038 B2
• Filed: 08/09/2007
• Issued: 07/07/2009
• Est. Priority Date: 08/11/2006
• Status: Active Grant

• Current Assignee: Philips RS North America LLC (Koninklijke Philips N.V.)
• Original Assignee: RIC INVESTMENTS LLC (Respironics Incorporated)
• Inventors: Kirby, Todd, Baloa, Leonardo A., Witt, Erik K.
• Primary Examiner(s): Douglas; Steven O
• Application Number:
  US11/836,292
• Publication Number:
  US 20080035147A1
• Time in Patent Office: 698 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.23, 128/204.24, 128/205.24
• US Class Current: 128/204.21
• CPC Class Codes: A61M 16/0009 with sub-atmospheric pressure, e.g. during expiration
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/01 specially adapted for anaesthetising A61M16/104, A61M16/18 take precedence
• CPC Class Codes: A61M 16/026 specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: A61M 2230/42 Rate

Abstract

A method and corresponding system for providing breathing cues includes monitoring respiration of a user and determining a user breathing frequency including an inspiration portion and an expiration portion of the breathing, supplying a high positive air pressure to the user during the inspiration portion and a low positive air pressure during the expiration portion in substantial synchronicity with the user'"'"'s respiration, comparing the user breathing frequency with a target breathing frequency, and when the user breathing frequency is greater than the target breathing frequency, increasing, in a predetermined manner, a time over which the high positive air pressure is supplied to the user, and adjusting a time over which the low positive pressure air pressure is supplied to the user.

Claims

1. A method of adjusting a breathing rate of a self-ventilating user, the method comprising:

monitoring respiration of a self-ventilating user and determining a user breathing frequency of said self-ventilating user, wherein respiration comprises an inspiration portion and an expiration portion;

setting a target breathing frequency at or below the user breathing frequency;

providing breathing cues to the self-ventilating user to breathe at the target breathing frequency by supplying a high positive air pressure to said self-ventilating user during said inspiration portion and a low positive air pressure during said expiration portion in substantial synchronicity with respiration at the target breathing frequency;

subsequent to providing breathing cues to the self-ventilating user to breathe at the target breathing frequency, determining an undated user breathing frequency of the self-ventilating user;

comparing said updated user breathing frequency with the target breathing frequency; and

increasing the target breathing frequency if the updated user breathing frequency of said self-ventilating user is greater than the target breathing frequency.

2. The method of claim 1, further comprising adjusting the time over which said low positive pressure air pressure is supplied to said self-ventilating user to achieve a predetermined ratio between the time over which said high positive air pressure is supplied to said self-ventilating user and the time over which said low positive pressure air pressure is supplied to said self-ventilating user.

3. The method of claim 1, wherein the time over which said low positive pressure air pressure is supplied to said self-ventilating user is set as a minimum of an estimated expiration time and said self-ventilating user'"'"'s actual expiration time.

4. The method of claim 1, further comprising incrementally lowering the target breathing rate toward a goal breathing rate if the updated breathing frequency is less than or equal to the target breathing rate.

5. The method of claim 4,further comprising keeping track of a therapy time and comparing said therapy time to a predetermined threshold amount of therapy time, wherein therapy time is time during which the target breathing rate is equal to or less than the goal breathing rate.

6. The method of claim 4, wherein the goal breathing rate is about 10 breaths per minute.

7. The method of claim 1, further comprising determining how long said self-ventilating user is breathing at a given breathing frequency.

8. The method of claim 1, wherein a top level driving system supplies said target breathing frequency to a low level control system that controls said high positive air pressure and said low positive air pressure.

9. The method of claim 4, wherein providing breathing cues to the self-ventilating user to breathe at the target breathing frequency subsequent to the incremental lowering of the target breathing frequency comprises increasing a time over which said high positive air pressure is supplied to said self-ventilating user.

10. The method of claim 1, further comprising computing an average breath rate for said self-ventilating user.

11. The method of claim 1, further comprising computing a difference between said target breathing frequency and said current user breathing frequency.

12. The method of claim 1, further comprising supplying a gas other than room air.

13. The method of claim 1, further comprising detecting onset of a sleeping state of the self-ventilating user based on the self-ventilating user'"'"'s responsiveness to changes in the target breathing frequency.

14. A method for adjusting a breathing rate of a self-ventilating person, the method comprising:

monitoring a current breath rate of a self-ventilating person;

obtaining a target breath rate that is different than the breath rate of the self-ventilating person; and

providing breathing cues to the self-ventilating person that prompt the self-ventilating person to breathe at the target breath rate, wherein providing breathing cues to the self-ventilating person comprises adjusting one or more parameters of a flow of gas directed to the airway of the self-ventilating person.

15. The method of claim 14, wherein monitoring the self-ventilating person'"'"'s breath rate comprises selectively filtering signals indicative of breathing dynamics of the self-ventilating person.

16. The method of claim 14, wherein monitoring the breath rate of the self-ventilating person comprises determining the length of an inspiration period of the self-ventilating person, wherein obtaining the target breath rate comprises obtaining a length of an estimated inspiration period, and wherein providing breathing cues to the self-ventilating person comprises providing breathing cues to the self-ventilating person prompting the self-ventilating person to inhale for an inspiration period having a length that corresponds to the longer of the inspiration period of the self-ventilating person or the estimated inspiration period.

17. The method of claim 14, wherein monitoring the breath rate of the self-ventilating person comprises determining the length of an expiration period of the self-ventilating person, wherein obtaining the target breath rate comprises obtaining a length of an estimated expiration period, and wherein providing breathing cues to the self-ventilating person comprises providing breathing cues to the self-ventilating person promoting the self-ventilating person to exhale for an expiration period having a length that corresponds to the shorter of the expiration period of the self-ventilating person or the estimated expiration period.

18. The method of claim 14, wherein the flow of gas directed to the airway of the self-ventilating person as breathing cues is directed to the airway of the subject by a bi-level positive air pressure device.

19. The method of claim 14, wherein the one or more parameters of the flow of gas directed to the airway of the self-ventilating person as breathing cues include one or both of flow rate and/or pressure.

20. A method for controlling a bi-level positive air pressure (BiPAP) device, comprising:

setting a machine inspiration time as a maximum of an estimated inspiration time and an actual inspiration time of a user;

setting a machine expiration time as a minimum of an estimated expiration time and a difference between a period of a breath of the user and the machine expiration time; and

using the machine inspiration time and the machine expiration time to control respective HI and LO positive pressure timings in the BiPAP device.

21. The method of claim 20, further comprising keeping track of a therapy time and comparing said therapy time to a predetermined maximum therapy time.

22. The method of claim 20, further comprising increasing, in a predetermined manner, the estimated inspiration time.

23. The method of claim 20, further comprising determining how long a user of the BiPAP device is breathing at a given breathing frequency.