Health monitoring systems and methods

• US 10,863,947 B2
• Filed: 09/25/2018
• Issued: 12/15/2020
• Est. Priority Date: 10/07/2012
• Status: Active Grant

• Current Assignee: RDS SAS
• Original Assignee: RDS SAS
• Inventors: Golda, George Stefan, Moyer, Daniel Van Zandt, Marriott, Mark P., Eletr, Sam, O'Neil, Bruce
• Primary Examiner(s): Kahelin, Michael W
• Assistant Examiner(s): Jian, Shirley X
• Application Number:
  US16/141,544
• Publication Number:
  US 20190029599A1
• Time in Patent Office: 812 Days
• Field of Search: None
• CPC Class Codes: A61B 2560/0295 adapted for recording user messages or annotations
• CPC Class Codes: A61B 2560/0412 Low-profile patch shaped housings
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/02141 Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits A61B5/02233, A61B5/0235 take precedence
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/0261 using optical means, e.g. infrared light
• CPC Class Codes: A61B 5/0295 using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography
• CPC Class Codes: A61B 5/08 Detecting, measuring or recording devices for evaluating the respiratory organs A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/259 using conductive adhesive means, e.g. gels
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/335 using integrated circuit memory devices
• CPC Class Codes: A61B 5/352 : Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 5/6828 : Leg
• CPC Class Codes: A61B 5/6833 : Adhesive patches
• CPC Class Codes: A61B 5/72 : Signal processing specially adapted for physiological signals or for diagnostic purposes character recognition, recognising digital ink, document-oriented image-based pattern recognition G06V30/00; recognition or understanding of postal images G06V30/424
• CPC Class Codes: A61B 5/7207 : of noise induced by motion artifacts
• CPC Class Codes: A61B 5/721 : using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured
• CPC Class Codes: A61B 5/7214 : using signal cancellation, e.g. based on input of two identical physiological sensors spaced apart, or based on two signals derived from the same sensor, for different optical wavelengths
• CPC Class Codes: A61B 5/7275 : Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor

Abstract

Systems, methods and devices for reducing noise in health monitoring including monitoring systems, methods and/or devices receiving a health signal and/or having at least one electrode or sensor for health monitoring.

Claims

1. A device for monitoring a physiological parameter, the device being adapted to be adhered to the skin of a subject for the physiological parameter monitoring;

the device comprising;

a substrate;

one or more light sources;

a light sensor;

circuitry for reducing errors caused by ambient light using a correlated double sampling technique;

comprising;

first and second switches and;

first and second capacitors,

the first capacitor being in series with the light sensor, and the second capacitor being in parallel with the output, and the first and second switches being disposed between the output and ground to alternatively provide output or shunt to ground;

the first capacitor being C1, the second capacitor being C2, the first switch being S1, the second switch being S2 and

when the one or more light sources are turned off, and switch S1 is closed, and switch S2 is open;

charge proportional to the noise signal accumulates on C1, and then switch S1 is opened and, then, the voltage on C1 is equal to the noise signal voltage; and

,

next, the light signal is measured;

switch S2 is closed, and charge is allowed to flow through C1 and C2 in series; and

, then, S2 is opened, and the voltage is held on C2 until the next measurement cycle when the whole process is repeated; and

,

if C1 is much larger than C2, nearly all the voltage will appear on C2, and the voltage on C2 will be equal to the noise-free signal (s);

or, otherwise, the voltage on C2 will be a linear combination of the previous C2 voltage (p) and the noise-free signal;

(C2*s+C1*p)/(C1+C2).

2. A device according to claim 1 further including a resistor in parallel with the other circuit elements.

3. A device according to claim 1 wherein either one of:

a filtering effect is of applying a first-order, low-pass, IIR discrete-time filter to the light signal;

or,

if this filtering effect is not desired, the voltage on C2 is discharged to zero before the light signal is measured each cycle, the light signal being held on C2 is;

(C2*s)/(C1+C2).

4. A device according to claim 1;

one or more of;

a trans-impedance amplifier is used in place of a resistor;

a phototransistor in place of the light sensor; and

field effect transistors or FETs in place of the first and second switches;

or

the output is followed by one or more of

additional buffering,

amplification,

filtering and

processing stages.