Non-invasive wearable respiration rate monitoring system

• US 10,117,598 B1
• Filed: 11/04/2016
• Issued: 11/06/2018
• Est. Priority Date: 11/08/2015
• Status: Active Grant

• Current Assignee: Kehaai Incorporated
• Original Assignee: Sensogram Technologies, Inc.
• Inventors: Mouradian, Vahram
• Primary Examiner(s): Peng, Bo J
• Application Number:
  US15/344,467
• Time in Patent Office: 732 Days
• CPC Class Codes: A61B 5/02433 for infrared radiation
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/0803 Recording apparatus specially adapted therefor
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/0873 using optical means
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/725 using specific filters therefor, e.g. Kalman or adaptive filters A61B5/316 take precedence
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters

Abstract

There is disclosed a respiration rate monitoring system and method using a non-invasive device and method of monitoring it nearly continuously. One aspect includes receiving a series of signal data points from an optical sensor, detecting a series of peaks or valleys for the filtered signal data points, determining the time difference between individual peaks or valleys of the series of peaks or valleys to produce a series of time difference values, detecting peaks or valleys for the series of time difference values, determining widths between the peaks or valleys of the series of time difference values, and estimating a respiration rate from the widths between the peaks or valleys of the series of time difference values, and converting the estimation of a respiration rate to an indicator indicative of a respiration rate.

Claims

1. A method of transforming optical signals into indicators indicative of a respiration rate, the method comprising:

receiving optical signals from an optical sensor;

transforming the optical signals to a series of signal data points;

filtering the signal data points to remove data points caused from noise and artifacts;

checking signal quality of the filtered signal data points by comparing the filtered signal data points against a predetermined signal quality criteria, if the signal quality does not meet the predetermined signal quality criteria, repeating the steps above, if the signal quality meets the predetermined signal quality criteria, proceeding with the steps below;

detecting a series of peaks or valleys for the filtered signal data points;

determining the time difference between individual peaks or valleys of the series of peaks or valleys to produce a series of time difference values;

detecting peaks or valleys for the series of time difference values;

determining widths between the peaks or valleys of the series of time difference values;

estimating a respiration rate from the widths between the peaks or valleys of the series of time difference values;

converting the estimation of a respiration rate to a indicator indicative of a respiration rate, and

storing the estimation of respiration rate in a memory of a device.

2. The method of claim 1, wherein the filtering the signal data points to remove data points caused from noise and artifacts further comprises applying a bandpass filter to the data points.