Methods and system for detecting inhalations and extracting measures of neural respiratory drive from an emg signal

Patent metadata

Field	Value
Publication number	US-2020121260-A1
Application number	US-201816605545-A
Country	US
Kind code	A1
Filing date	Apr 13, 2018
Priority date	Apr 20, 2017
Publication date	Apr 23, 2020
Grant date	—

Abstract

The invention provides a method (10) for detecting a neural respiratory drive measure of a user. The method includes obtaining (100) an EMG signal and processing (200, 280) the EMG signal to produce a surrogate respiration signal and a processed EMG signal. Inhalations of the user are then detected (300) based on the surrogate respiration signal. The detected inhalations are then used in conjunction with the processed EMG signal to determine (400) a neural respiratory drive measure of the user.

First claim

1 . A method for extracting a neural respiratory drive measure of a user, the method comprising:
obtaining an EMG signal; processing the EMG signal to produce a processed EMG signal; processing the EMG signal to produce a surrogate respiration signal,
wherein the surrogate respiration signal is obtained only from the EMG signal;
detecting inhalations of the user based on the surrogate respiration signal; and
determining a neural respiratory drive measure based on the detected inhalations and the processed EMG signal.

2 . A method as claimed in claim 1 , wherein the processing of the EMG signal to produce a surrogate respiration signal comprises performing spike removal on the EMG signal.

3 . A method as claimed in claim 1 , wherein the processing of the EMG signal to produce a surrogate respiration signal comprises applying a first high pass filter to the EMG signal.

4 . A method as claimed in claim 3 , wherein the first high pass filter has a cutoff frequency of greater than or equal to 150 Hz, for example 200 Hz.

5 . A method as claimed in claim 1 , wherein the processing of the EMG signal to produce a surrogate respiration signal comprises performing envelope detection on the EMG signal, wherein the envelope detection comprises:
applying a rectification operator to the EMG signal, to generate a second EMG signal; and applying a low pass filter to the second EMG signal.

6 . A method as claimed in claim 5 , wherein the second EMG signal comprises an energy-like measure of the EMG signal.

7 . A method as claimed in claim 6 , wherein the energy-like measure of the EMG signal comprises at least one of the Teager-Kaiser energy and the conventional energy.

8 . A method as claimed in claim 5 , wherein the rectification operator comprises at least one of the absolute operator and the square operator.

9 . A method as claimed in claim 1 , wherein the processing of the EMG signal to produce a surrogate respiration signal comprises downsampling the EMG signal.

10 . A method as claimed in claim 1 , wherein the processing of the EMG signal to produce a surrogate respiration signal comprises applying a median filter to the EMG signal.

11 . A method as claimed in claim 1 , wherein the processing of the EMG signal to produce a surrogate respiration signal comprises applying a second high pass filter to the EMG signal.

12 . A method as claimed in claim 1 , wherein the method further comprises computing the neural respiratory drive of the user based on the neural respiratory drive measure.

13 . A computer program comprising computer program code means which is adapted, when said computer is run on a computer, to implement the method of claim 1 .

14 . A controller for determining a neural respiratory drive measure of a user in an EMG measurement system, wherein the controller is adapted to:
obtain an EMG signal; process the EMG signal to produce a processed EMG signal wherein the surrogate respiration signal is produced only from the EMG signal; process the EMG signal to produce a surrogate respiration signal; detect inhalations of the user based on the surrogate respiration signal; and determine a neural respiratory drive measure based on the detected inhalations and the processed EMG signal.

15 . An inhalation detection system comprising:
an EMG electrode adapted to measure the EMG signal; and a controller as claimed in claim 14 .

Assignees

• Koninklijke Philips Nv

Inventors

• Van De Laar Jakob
• Devot Sandrine Magali Laure
• Derkx Rene Martinus Maria

Classifications

• A61B5/08

  Measuring devices for evaluating the respiratory organs · CPC title

• A61B5/4041

  Evaluating nerves condition · CPC title

• A61B5/087 Primary

  Measuring breath flow · CPC title

• A61B5/7278 Primary

  Artificial waveform generation or derivation, e.g. synthesizing signals from measured signals · CPC title

• A61B5/0488

  Human Necessities · mapped topic