# US 12,109,029 B2 · Wireless cardiac monitoring device and method to measure and transmit cardiac physiological signals

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- Number: US 12,109,029 B2
- Document ID: US12109029B2
- Status: Granted
- Kind: B2
- Application number: 17/232,394
- Filed: 2021-04-16
- Published: 2021-07-29
- Granted: 2024-10-08
- Earliest claimed: 2015-05-12
- Assignees: Monitra Healthcare Private Limited
- Applicants: Monitra Healthcare Private Limited
- Inventors: Ravi Bhogu
- Web page: https://patentgrep.com/patent/US12109029B2

## CPC

- A61B 5/257: using adhesive means, e.g. adhesive pads or tapes
- A61B 5/0006: {ECG or EEG signals}
- A61B 5/1121: {Determining geometric values, e.g. centre of rotation or angular range of movement}
- A61B 5/28: for electrocardiography [ECG]
- A61B 5/341: Vectorcardiography [VCG]
- A61B 5/353: Detecting P-waves
- A61B 5/358: Detecting ST segments
- A61B 5/6833: {Adhesive patches}
- A61B 5/7221: {Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217)}
- A61B 5/352: Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
- A61B 2562/0219: Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
- A61B 2562/0223: Magnetic field sensors
- G16H 10/60: for patient-specific data, e.g. for electronic patient records
- G16H 40/60: for the operation of medical equipment or devices
- 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 and a wireless cardiac monitoring device to measure and transmit cardiac physiological signals of a subject. The device comprises a patch configured to be in contact with a skin surface of the subject. The patch comprises a plurality of electrodes and at least one wire-free module, embedded in the patch. The wire-free module comprises a patch orientation detection module to detect an orientation of the patch on the subject using a plurality of sensors. The wire-free module also comprises a processing module to select at least two pair of electrodes from the plurality of electrodes based on the detected orientation of the patch and process one or more bio-potential signals corresponding to the at least two pair of electrodes selected, as the physiological signals. The wire-free module further comprises a transmission module to transmit the physiological signals to an external device for further processing.

## Claims

### Claim 1

A wireless cardiac monitoring device to measure and transmit cardiac physiological signals of a subject, the device comprising:
a patch configured to be in contact with a skin surface of the subject, comprising:
a plurality of electrodes capable of generating one or more bio-potential signals therefrom; and
at least one wire-free module, embedded in the patch, comprising:
a patch orientation detection module to detect an orientation of the patch on the subject using a plurality of sensors:
a processing module to:
select at least two pair of electrodes from the plurality of electrodes based on the detected orientation of the patch by:
selecting a subset of electrodes from the plurality of electrodes based on the detected orientation, wherein the subset of electrodes are predefined for each detected orientation;
correlating one or more vectors each connecting at least two electrodes of the subset of electrodes with a reference axis, wherein the reference axis is at least one of a horizontal axis and a vertical axis;
determining a confidence score for each of the one or more vectors; and
selecting the at least two pair of electrodes based on the confidence score determined; and
process one or more bio-potential signals corresponding to the at least two pair of electrodes selected, as the physiological signals; and
a transmission module to transmit the physiological signals to an external device for further processing.

### Claim 2 (depends on 1)

The device of claim 1, wherein to correlate the one or more vectors each connecting at least two electrodes of the subset of electrodes with the reference axis, the processing module is configured to:
determine an angular distance between each of the one or more vectors and the reference axis; and
estimate an inter-electrode distance for each of the one or more vectors.

### Claim 3 (depends on 2)

The device of claim 2, wherein the processing module is configured to determine the confidence score for each of the one or more vectors based on the angular distance and the inter-electrode distance.

### Claim 4 (depends on 2)

The device of claim 2, wherein to correlate a vector joining each of at least two electrodes of the subset of electrodes with the reference axis, the processing module is further configured to determine an amplitude of a signal corresponding to a pair of electrodes included in each of the one or more vectors.

### Claim 5 (depends on 4)

The device of claim 4, wherein the processing module is configured to determine the confidence score for each of the one or more vectors based on the determined amplitude of the signal.

### Claim 6 (depends on 4)

The device of claim 4, wherein the processing module is configured to measure P wave amplitude and QRS wave amplitude of the signal to determine the amplitude of the signal.

### Claim 7 (depends on 1)

The device of claim 1, wherein to select the at least two pair of electrodes based on the determined confidence score, the processing module is configured to:
select a first pair of electrodes of the at least two pair of electrodes when the reference axis is the horizontal axis; and
select a second pair of electrodes of the at least two pair of electrodes when the reference axis is the vertical axis.

### Claim 8 (depends on 1)

The device of claim 1, wherein the plurality of sensors includes at least one of an accelerometer, a gyroscope and a magnetometer.

### Claim 9

A method of measuring and transmitting physiological cardiac signals of a subject, the method comprising:
placing a patch comprising a plurality of electrodes, on a skin surface of the subject, to measure the physiological signals of the subject;
detecting an orientation of the patch on the subject using a plurality of sensors;
selecting at least two pair of electrodes from the plurality of electrodes based on the detected orientation of the patch by:
selecting a subset of electrodes from the plurality of electrodes based on the detected orientation;
correlating one or more vectors each connecting at least two electrodes of the subset of electrodes with a reference axis, wherein the reference axis is at least one of a horizontal axis and a vertical axis;
determining a confidence score for each of the one or more vectors; and
selecting the at least two pair of electrodes based on the confidence score determined:
processing one or more bio-potential signals corresponding to the at least two pair of electrodes selected, as the physiological signals; and
transmitting the physiological signals to an external device for further processing.

### Claim 10 (depends on 9)

The method of claim 9, wherein correlating the one or more vectors each connecting at least two electrodes of the subset of electrodes with a reference axis includes:
determining an angular distance between each of the one or more vectors and the reference axis; and
estimating an inter-electrode distance for each of the one or more vectors.

### Claim 11 (depends on 10)

The method of claim 10, wherein determining a confidence score for each of the one or more vectors includes determining the confidence score for each of the one or more vectors based on the angular distance and the inter-electrode distance.

### Claim 12 (depends on 10)

The method of claim 10, wherein correlating a vector connecting each of at least two electrodes of the subset of electrodes with a reference axis further includes determining an amplitude of a signal corresponding to a pair of electrodes included in each of the one or more vectors.

### Claim 13 (depends on 12)

The method of claim 12, wherein determining the confidence score for each of the one or more vectors further includes determining the confidence score for each of the one or more vectors based on the determined amplitude of the signal.

### Claim 14 (depends on 12)

The method of claim 12, wherein the amplitude of the signal is determined based on P wave amplitude and QRS wave amplitude of the signal.

### Claim 15 (depends on 9)

The method of claim 9, wherein selecting the at least two pair of electrodes based on the confidence score includes:
selecting a first pair of electrodes of the at least two pair of electrodes when the reference axis is the horizontal axis; and
selecting a second pair of electrodes of the at least two pair of electrodes when the reference axis is the vertical axis.