# US 11,076,767 B2 · Method and system of monitoring cardiac activity of a user

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- Number: US 11,076,767 B2
- Document ID: US11076767B2
- Status: Granted
- Kind: B2
- Application number: 16/464,404
- Filed: 2017-11-23
- Published: 2020-10-29
- Granted: 2021-08-03
- Earliest claimed: 2016-11-29
- Assignees: Koninklijke Philips N.V.
- Applicants: Koninklijke Philips N.V.
- Inventors: Alberto Giovanni Bonomi
- Web page: https://patentgrep.com/patent/US11076767B2

## CPC

- A61B 5/02416: {using photoplethysmograph signals, e.g. generated by infrared radiation (A61B5/14552 takes precedence)}
- A61B 5/0004: {characterised by the type of physiological signal transmitted}
- A61B 5/0006: {ECG or EEG signals}
- A61B 5/1102: {Ballistocardiography}
- A61B 5/361: Detecting fibrillation
- A61B 5/363: Detecting tachycardia or bradycardia
- A61B 5/681: {Wristwatch-type devices}
- 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 5/7282: {Event detection, e.g. detecting unique waveforms indicative of a medical condition (cough events A61B5/0823; seizures A61B5/4094; sleep apnoea A61B5/4818)}
- A61B 5/74: {Details of notification to user or communication with user or patient; User input means}
- A61B 5/7465: {Arrangements for interactive communication between patient and care services, e.g. by using a telephone network (telemetry of measured physiological signal A61B5/0002)}
- G16H 80/00: ICT specially adapted for facilitating communication between medical practitioners or patients, e.g. for collaborative diagnosis, therapy or health monitoring
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA

## Abstract

A method of monitoring cardiac activity of a user is provided. Heart beat time data is detected by a PPG sensor (110) in a health sensor (100) worn by the user (1). Motion data is detected by a motion sensor (120) in the health sensor (100). The output data of the PPG sensor (110), which comprises heart beat time data, is analyzed to detect arrhythmia periods. The detected heart beat time data, the detected motion data and the detected arrhythmia are forwarded to an external device, where the data can be stored. The output data of the PPG sensor (110) comprising the heart beat time data, the detected motion data and the detected arrhythmia periods are displayed such that a medical professional (2) can analyze this data to determine whether a suspected arrhythmia period is valid.

## Claims

### Claim 1

A method of monitoring cardiac activity of a user, comprising the steps of:
detecting heart beat time data by a photo-plethysmographic PPG sensor in a health sensor worn by a user;
detecting motion data by a motion sensor in the health sensor;
analyzing output data of the PPG sensor comprising heart beat time data to detect suspected arrhythmia periods;
outputting a message to the user to operate a specific movement protocol with a body part where the health sensor is located to avoid motion artefacts in the output signal of the PPG sensor when the suspected arrhythmia periods are detected;
detecting heart beat time data and motion data including a health sensor position and orientation during the specific movement protocol;
analyzing the motion data detected during the specific motion protocol to determine whether the user has followed the specific motion protocol;
analyzing the heart beat time data detected during the specific movement protocol to detect suspected arrhythmia periods;
forwarding the detected heart beat time data, the detected motion data and the detected arrhythmia period to an external device, where the data can be stored;
generating data templates of heart beat time data and heart beat time signal waveforms during the detection of the heart beat time data, said reference templates also include information on health sensor positions and orientations detected during the specific movement protocol;
displaying the data template of the PPG sensor comprising heart beat time data and a raw signal of the output data of the PPG sensor detected during the suspected arrhythmia periods, the detected motion data as well as at least one previously generated data template to serve as reference such that a medical professional can analyze this data to determine whether the suspected arrhythmia period is a valid arrhythmia period; and
forwarding the data templates including detected heart beat time data, the detected motion data, the detected arrhythmia period, the health sensor position and orientation to an external device, where the data can be stored for future reference.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising the steps of:
inputting user symptoms;
detecting heart rate rhythm irregularities in the output data of the PPG sensor; and
displaying the user symptoms and the heart rate rhythm irregularities together with the output signal of the PPG sensor, the heart rate data, the motion data and the suspected arrhythmia period.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the arrhythmia period is an atrial fibrillation period.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the arrhythmia period is heart pause period, a tachycardia period, a bradycardia period or supra-ventricular arrhythmia periods.

### Claim 5

A system of monitoring cardiac activity of a user, comprising:
a health sensor which comprises a photo-plethysmographic PPG sensor configured to detect heart beat time data, a motion sensor configured to detect motion data of the user and a control unit configured to analyze output data of the PPG sensor comprising heart beat time data to detect suspected arrhythmia periods of the user,
wherein the health sensor is configured to output a message to the user to operate a specific movement protocol with the body part where the health sensor is located to avoid motion artefacts in the output signal of the PPG sensor when the suspected arrhythmia periods are detected,
wherein the health sensor is configured to detect heart beat time data and motion data including a health sensor position and orientation during the specific movement protocol,
wherein the control unit is configured to analyze the motion data to determine whether the user has followed the specific motion protocol and to analyze the heart rate time data detected during the specific motion protocol to determine suspected arrhythmia periods,
wherein the health sensor is configured to generate data templates of heart beat time data and heart beat time signal waveforms during the detection of the heart beat time data during the specific movement protocol, wherein said reference template include information on health sensor positions and orientations;
a display unit configured to display the data templates of the PPG sensor, comprising heart beat time data, the detected motion data and the detected raw signal during suspected arrhythmia periods as well as previously generated data templates such that a medical professional can analyze this data to determine whether a suspected arrhythmia period is a valid arrhythmia period; and
a storage unit to which the detected heart beat time data, the detected motion data, the detected suspected arrhythmia periods and the data templates are forwarded by the health sensor to be stored for future reference.

### Claim 6

A non-transitory computer program comprising program code means for causing a system for monitoring cardiac activity of a user to carry out a method of monitoring cardiac activity of a user, when the computer program is run on the system of monitoring cardiac activity of a user the method comprising:
detecting heart beat time data by a photo-plethysmographic PPG sensor in a health sensor worn by a user;
detecting motion data by a motion sensor in the health sensor;
analyzing output data of the PPG sensor comprising heart beat time data to detect suspected arrhythmia periods;
outputting a message to the user to operate a specific movement protocol with a body part where the health sensor is located to avoid motion artefacts in the output signal of the PPG sensor when the suspected arrhythmia periods are detected;
detecting heart beat time data and motion data including a health sensor position and orientation during the specific movement protocol;
analyzing the motion data detected during the specific motion protocol to determine whether the user has followed the specific motion protocol;
analyzing the heart beat time data detected during the specific movement protocol to detect suspected arrhythmia periods;
forwarding the detected heart beat time data, the detected motion data and the detected arrhythmia period to an external device, where the data can be stored;
generating data templates of heart beat time data and heart beat time signal waveforms during the detection of the heart beat time data, said reference templates also include information on health sensor positions and orientations detected during the specific movement protocol;
displaying the data template of the PPG sensor comprising heart beat time data and a raw signal of the output data of the PPG sensor detected during the suspected arrhythmia periods, the detected motion data as well as at least one previously generated data template to serve as reference such that a medical professional can analyze this data to determine whether the suspected arrhythmia period is a valid arrhythmia period; and
forwarding the data templates including detected heart beat time data, the detected motion data, the detected arrhythmia period, the health sensor position and orientation to an external device, where the data can be stored for future reference.

### Claim 7 (depends on 1)

The method of claim 1, wherein the health sensor is a wearable health sensor to be worn by the user.

### Claim 8 (depends on 5)

The system of claim 5, wherein the health sensor is a wearable health sensor to be worn by the user.