SYSTEMS AND METHODS FOR RESPIRATION MONITORING

• US 20110021892A1
• Filed: 07/23/2009
• Published: 01/27/2011
• Est. Priority Date: 07/23/2009
• Status: Abandoned Application

• Current Assignee: Nellcor Puritan Bennett Ireland
• Original Assignee: Nellcor Puritan Bennett Ireland
• Inventors: Addison, Paul Stanley, Watson, James N., McGonigle, Scott
• Application Number:
  US12/508,180
• Publication Number:
  US 20110021892A1
• Time in Patent Office: Days
• US Class Current: 600/323
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: A61B 5/7225 Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation A61B5/30, A61B5/316 take precedence; transformers for specific applications H01F38/00; amplifiers H03F
• CPC Class Codes: A61B 5/726 using Wavelet transforms

Abstract

According to embodiments, techniques for determining respiratory parameters are disclosed. More suitable probe locations for determining respiratory parameters, such as respiration rate and respiratory effort, may be identified. The most suitable probe location may be selected for probe placement. A scalogram may be generated from the detected signal at the more suitable location, resulting in an enhanced breathing band for determining respiratory parameters. Flexible probes that allow for a patient'"'"'s natural movement due to respiration may also be used to enhance the breathing components of the detected signal. From the enhanced signal, more accurate and reliable respiratory parameters may be determined.

Claims

1. A method for determining a respiratory parameter of a patient, comprising:

receiving a first signal from a first probe at a first probe location;

computing a first index for the first probe location, the first index based at least in part on the respiratory components in the first signal;

receiving a second signal from a second probe at a second probe location, wherein the second probe location is different than the first probe location;

computing a second index for the second probe location, the second index based at least in part on the respiratory components in the second signal;

comparing the first index to the second index; and

selecting, based at least in part on the comparing, one of the first probe location and the second probe location for determining at least one respiratory parameter.

2. The method of claim 1 further comprising determining the at least one respiratory parameter at the selected probe location.

3. The method of claim 1 wherein the at least one respiratory parameter is selected from the group consisting of respiration rate and respiratory effort.

4. The method of claim 1 wherein receiving a first signal from a first probe location comprises receiving a photoplethysmograph (PPG) signal from a pulse oximetry probe.

5. The method of claim 1 wherein computing a first index for the first probe location comprises:

performing a continuous wavelet transform on the first signal to produce a first transformed signal; and

generating a scalogram based at least in part on the first transformed signal.

6. The method of claim 5 further comprising:

identifying a breathing band in the scalogram; and

determining the energy associated with the breathing band.

7. The method of claim 6 wherein the first index is proportional to the determined energy associated with the breathing band.

8. The method of claim 6 further comprising:

identifying a pulse band in the scalogram; and

determining the energy associated with the pulse band.

9. The method of claim 8 wherein the first index is proportional to the ratio of the determined energy associated with the breathing band to the determined energy associated with the pulse band.

10. The method of claim 1 wherein the first probe location and the second probe location exhibit natural movement due to respiration of the patient.

11. A system for determining a respiratory parameter of a patient, comprising:

a first probe capable of receiving a first signal from a first probe location;

a second probe capable of receiving a second signal from a second probe location; and

a processor capable of;

computing a first index for the first probe location, the first index based at least in part on the respiratory components in the first signal;

computing a second index for the second probe location, the second index based at least in part on the respiratory components in the second signal;

comparing the first index to the second index; and

selecting, based at least in part on the comparing, one of the first probe location and the second probe location for determining at least one respiratory parameter.

12. The system of claim 11 wherein the processor is additionally capable of determining the at least one respiratory parameter at the selected probe location.

13. The system of claim 11 wherein the at least one respiratory parameter is selected from the group consisting of respiration rate and respiratory effort.

14. The system of claim 11 wherein the first probe is a pulse oximetry probe capable of receiving a photoplethysmograph (PPG) signal.

15. The system of claim 11 wherein the processor is capable of computing a first index for the first probe location by:

performing a continuous wavelet transform on the first signal to produce a first transformed signal; and

generating a scalogram based at least in part on the first transformed signal.

16. The system of claim 15 wherein the processor is additionally capable of:

identifying a breathing band in the scalogram; and

determining the energy associated with the breathing band.

17. The system of claim 16 wherein the first index is proportional to the determined energy associated with the breathing band.

18. The system of claim 16 wherein the processor is additionally capable of:

identifying a pulse band in the scalogram; and

determining the energy associated with the pulse band.

19. The system of claim 18 wherein the first index is proportional to the ratio of the determined energy associated with the breathing band to the determined energy associated with the pulse band.

20. The system of claim 11 wherein the first probe location and the second probe location exhibit natural movement due to respiration of the patient.