Systems and methods for detecting held breath events

• US 10,022,068 B2
• Filed: 10/27/2014
• Issued: 07/17/2018
• Est. Priority Date: 10/28/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: McGonigle, Scott, Ochs, James
• Primary Examiner(s): Fernandez, Katherine
• Assistant Examiner(s): IMPINK, BRADLEY GERALD
• Application Number:
  US14/524,327
• Publication Number:
  US 20150119720A1
• Time in Patent Office: 1,359 Days
• Field of Search: None
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/0806 by whole-body plethysmography measuring blood flow using plethysmography A61B5/0295; impedance plethysmography A61B5/053; measuring volume of the body or parts thereof A61B5/1073
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence

Abstract

Systems and methods are provided for detecting held breath events. A physiological signal, such as a photoplethysmograph (PPG) signal, is processed to extract respiration-related morphology metric signals. The morphology signals are analyzed to determine when a patient'"'"'s breath is being held.

Claims

1. A computer-implemented method comprising:

receiving a photoplethysmograph (PPG) signal;

posting, using processing circuitry, a respiration rate value;

generating, using the processing circuitry, one or more types of respiration morphology signals based on the PPG signal;

calculating, using the processing circuitry, a threshold value for each of the one or more respiration morphology signals;

comparing, using the processing circuitry, data indicative of each respiration morphology signal to a respective one of the threshold values;

identifying, using the processing circuitry, a held breath event based at least on the comparing; and

suspending, using the processing circuitry, the posting of a respiration rate value when the held breath event is identified.

2. The method of claim 1, wherein the one or more respiration morphology signals are selected from the group consisting of a down signal, a kurtosis signal, a second derivative signal, a b/a ratio signal, an amplitude signal, an amplitude modulation signal, a frequency modulation signal, and any combination thereof.

3. The method of claim 1, wherein the data indicative of each respiration morphology signal comprises an average of each respiration morphology signal over a predetermined period of time.

4. The method of claim 1, wherein calculating a threshold value comprises determining a mean absolute deviation value for each of the one or more respiration morphology signals.

5. The method of claim 4, wherein calculating a threshold value comprises:

for each of the one or more respiration morphology signals, determining a plurality of mean absolute deviation values for a respective plurality of time windows; and

for each of the one or more respiration morphology signals, averaging the mean absolute deviation values of the plurality of time windows.

6. The method of claim 1, further comprising:

calculating an oxygen saturation from the PPG signal; and

continuing to suspend the posting until the oxygen saturation is increasing.

7. A system comprising:

an input for receiving a photoplethysmograph (PPG) signal; and

processing circuitry configured for;

posting a respiration rate value;

generating one or more types of respiration morphology signals based on the PPG signal,

calculating a threshold value for each of the one or more respiration morphology signals,

comparing data indicative of each respiration morphology signal to a respective one of the threshold values,

identifying a held breath event based at least on the comparing; and

suspending the posting of a respiration rate value when the held breath event is identified.

8. The system of claim 7, wherein the one or more respiration morphology signals are selected from the group consisting of a down signal, a kurtosis signal, a second derivative signal, a b/a ratio signal, an amplitude signal, an amplitude modulation signal, a frequency modulation signal, and any combination thereof.

9. The system of claim 7, wherein the data indicative of each respiration morphology signal comprises an average of each respiration morphology signal over a predetermined period of time.

10. The system of claim 7, wherein the processing circuitry is further configured for determining a mean absolute deviation value for each of the one or more respiration morphology signals.

11. The system of claim 10, wherein the processing circuitry is further configured for:

for each of the one or more respiration morphology signals, determining a plurality of mean absolute deviation values for a respective plurality of time windows; and

for each of the one or more respiration morphology signals, averaging the mean absolute deviation values of the plurality of time windows.

12. The system of claim 7, wherein the processing circuitry is further configured for:

calculating an oxygen saturation from the PPG signal; and

continuing to suspend the posting until the oxygen saturation is increasing.

13. A non-transitory computer readable medium comprising instructions stored therein for performing the method comprising:

receiving a photoplethysmograph (PPG) signal;

posting a respiration rate value;

generating one or more types of respiration morphology signals based on the PPG signal;

calculating a threshold value for each of the one or more respiration morphology signals;

comparing data indicative of each respiration morphology signal to a respective one of the threshold values;

identifying a held breath event based at least on the comparing; and

suspending the posting of a respiration rate value when the held breath event is identified.

14. The computer readable medium of claim 13, wherein the one or more respiration morphology signals are selected from the group consisting of a down signal, a kurtosis signal, a second derivative signal, a b/a ratio signal, an amplitude signal, an amplitude modulation signal, a frequency modulation signal, and any combination thereof.

15. The computer readable medium of claim 13, wherein the data indicative of each respiration morphology signal comprises an average of each respiration morphology signal over a predetermined period of time.

16. The computer readable medium of claim 13, wherein calculating a threshold value comprises determining a mean absolute deviation value for each of the one or more respiration morphology signals.

17. The computer readable medium of claim 16, wherein calculating a threshold value comprises:

for each of the one or more respiration morphology signals, determining a plurality of mean absolute deviation values for a respective plurality of time windows; and

for each of the one or more respiration morphology signals, averaging the mean absolute deviation values of the plurality of time windows.