A system and method for determining respiratory effort

Patent metadata

Field	Value
Publication number	US-2023218196-A1
Application number	US-202117916121-A
Country	US
Kind code	A1
Filing date	Mar 24, 2021
Priority date	Apr 1, 2020
Publication date	Jul 13, 2023
Grant date	—

Abstract

The invention provides a system and method for determining a respiratory effort for a subject. The method comprises obtaining a relaxed signal representing a subject breathing in a relaxed manner and a forced signal representing a subject breathing in a forced manner. The relaxed signal is then smoothed over a first averaging window and the forced signal is smoothed over a second averaging window, wherein the first averaging window is longer than the second averaging window. Based on the smoothed relaxed signal and the smoothed forced signal, a respiratory effort can thus be determined.

First claim

1 . A system for determining a respiratory effort for a subject, the system comprising:
a processor configured to:
receive a relaxed signal representing a subject breathing in a relaxed manner;
receive a forced signal representing a subject breathing in a forced manner;
determine a smoothed relaxed signal based on smoothing the relaxed signal over a first averaging window;
determine a smoothed forced signal based on smoothing the forced signal over a second averaging window, wherein the first averaging window is longer than the second averaging window; and
determine a respiratory effort based on the smoothed relaxed signal and the smoothed forced signal.

2 . The system as claimed in claim 1 , further comprising at least two electrodes for obtaining at least one of the relaxed signal or the forced signal.

3 . The system as claimed in claim 1 , wherein the processor is further configured to:
obtain a plurality of peak values from the smoothed relaxed signal; obtain a plurality of peak values from the smoothed forced signal; determine an average relaxed peak value based on calculating an average value of the plurality of peak values from the smoothed relaxed signal; determine a maximal forced value peak based on the maximal peak from the plurality of peak values from the smoothed forced signal; and determine the respiratory effort based on dividing the average relaxed peak value the maximal forced peak value.

4 . The system as claimed in claim 1 , wherein smoothing a signal comprises computing a moving root mean square or a moving mean absolute value.

5 . The system as claimed in claim 1 , further comprising a display, wherein the display is configured to display one or more of:
the relaxed signal; the forced signal; the smoothed forced signal; the smoothed relaxed signal; or the respiratory effort.

6 . The system as claimed in claim 1 , further comprising a user input interface, wherein the user input interface is configured to receive from the user one or more of:
the type of smoothing to be computed for the relaxed signal; the type of smoothing to be computed for the forced signal; the first averaging window duration; the second averaging window duration; or a type of filtering to be applied to one or more of the relaxed signal and the forced signal.

7 . A method for determining a respiratory effort for a subject, the method comprising:
receiving, from at least two electrodes, a relaxed signal representing a subject breathing in a relaxed manner; receiving, from at least two electrodes, a forced signal representing a subject breathing in a forced manner; smoothing the relaxed signal over a first averaging window; smoothing the forced signal over a second averaging window, wherein the first averaging window is longer than the second averaging window; and determining a respiratory effort based on the smoothed relaxed signal and the smoothed forced signal.

8 . The method as claimed in claim 7 , wherein the first averaging window at least 0.2 seconds; and the second averaging window is at most 0.2 seconds.

9 . The method as claimed in claim 7 , further comprising obtaining the relaxed signal and/or the forced signal by the at least two electrodes placed on a subject.

10 . The method as claimed in claim 7 , wherein smoothing a signal comprises computing a moving root mean square or a mean absolute value.

11 . The method as claimed in claim 7 , wherein determining a respiratory effort comprises:
obtaining a plurality of peak values from the smoothed relaxed signal; obtaining a plurality of peak values from the smoothed forced signal; determining an average relaxed peak value based on calculating an average of the plurality of peak values from the smoothed relaxed signal; determining a maximal forced value peak value based on the maximal peak from the plurality of peak values from the smoothed forced signal; and determining the respiratory effort based on dividing the average relaxed peak value by the maximal forced peak value.

12 . The method as claimed in claim 7 , further comprising receiving from the user one or more of:
the type of smoothing to be computed for the relaxed signal; the type of smoothing to be computed for the forced signal; the first averaging window duration; the second averaging window duration; or a type of filtering to be applied to one or more of the relaxed signal and the forced signal.

13 . A non-transitory computer readable medium that stores therein a computer program product, which, when executed on a processor, causes the method as claimed in claim 7 to be performed.

Assignees

• Koninklijke Philips Nv

Inventors

• Derkx Rene Martinus Maria
• Van De Laar Jakob
• Priori Rita

Classifications

• A61B5/086

  by impedance pneumography · CPC title

• A61B5/08 Primary

  Measuring devices for evaluating the respiratory organs · CPC title

• A61B5/085 Primary

  Measuring impedance of respiratory organs or lung elasticity · CPC title

• A61B5/0803

  Recording apparatus specially adapted therefor · CPC title

• A61B5/6823

  Trunk, e.g., chest, back, abdomen, hip · CPC title