# US 10,863,947 B2 · Health monitoring systems and methods

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,863,947 B2
- Document ID: US10863947B2
- Status: Granted
- Kind: B2
- Application number: 16/141,544
- Filed: 2018-09-25
- Published: 2019-01-31
- Granted: 2020-12-15
- Earliest claimed: 2012-10-07
- Assignees: Rds
- Applicants: Rhythm Diagnostic Systems, Inc.
- Inventors: George Stefan Golda; Daniel Van Zandt Moyer; Mark P. Marriott; Sam Eletr; Bruce O'Neil
- Web page: https://patentgrep.com/patent/US10863947B2

## CPC

- 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}
- A61B 5/0002: {Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network (endoradiosondes A61B5/07)}
- A61B 5/0059: {using light, e.g. diagnosis by transillumination, diascopy, fluorescence (photoacoustic A61B5/0093; optical measurement of heart rate A61B5/02416; optical measurement of blood flow A61B5/0261; optical measurement of analytes A61B5/1455)}
- A61B 5/0205: Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
- A61B 5/02125: {of pulse wave propagation time}
- 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)}
- A61B 5/0261: {using optical means, e.g. infrared light}
- 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
- A61B 5/08: Measuring devices for evaluating the respiratory organs
- A61B 5/11: Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb {(A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721)}
- A61B 5/259: using conductive adhesive means, e.g. gels
- A61B 5/28: for electrocardiography [ECG]
- A61B 5/282: Holders for multiple electrodes (for introduction into the body A61B5/287)
- A61B 5/335: using integrated circuit memory devices
- A61B 5/6828: {Leg}
- A61B 5/72: {Signal processing specially adapted for physiological signals or for diagnostic purposes}
- A61B 5/7207: {of noise induced by motion artifacts}
- A61B 5/0006: {ECG or EEG signals}
- A61B 5/02438: {with portable devices, e.g. worn by the patient}
- A61B 5/1118: {Determining activity level}
- A61B 5/14551: {for measuring blood gases}
- A61B 5/14552: {Details of sensors specially adapted therefor}
- A61B 5/352: Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
- A61B 5/6833: {Adhesive patches}
- 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}
- 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}
- A61B 2560/0295: adapted for recording user messages or annotations
- A61B 2560/0412: Low-profile patch shaped housings
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## 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

### Claim 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).

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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).

### Claim 4 (depends on 1)

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.