# US 10,368,755 B2 · Apparatus and method for feature extraction and classification of fetal heart rate

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- Number: US 10,368,755 B2
- Document ID: US10368755B2
- Status: Granted
- Kind: B2
- Application number: 15/824,215
- Filed: 2017-11-28
- Published: 2018-03-22
- Granted: 2019-08-06
- Earliest claimed: 2013-06-25
- Assignees: The Research Foundation for The State University of New York
- Applicants: The Research Foundation for The State University of New York
- Inventors: Shishir Dash; J. Gerald Quirk; Petar Djuric
- Web page: https://patentgrep.com/patent/US10368755B2

## CPC

- A61B 5/02411: {of foetuses}
- A61B 5/033: {Uterine pressure}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

Provided are a device and method for receiving a fetal heart rate (FHR) signal at each interval during a monitoring period, receiving a uterine pressure (UP) signal at each of the intervals to obtain a plurality of FHR-UP signal pairs, and extracting a feature value for each FHR-UP signal pair, with the feature value being extracted from a predefined alphabet of feature values.

## Claims

### Claim 1

A method for operating an electronic device, the method comprising:
inputting, to a processor of the electronic device, a fetal heart rate (FHR);
inputting, to the processor, a plurality of uterine pressure (UP) values corresponding to the input FHR;
removing, by the processor, artifacts from the FHR and interpolating segments of the FHR;
storing, by a feature extractor, time information of segments of the interpolated FHR segments;
searching sub-segments of the stored time information to detect variability of the FHR;
detecting excess noise in the searched sub-segments;
obtaining a reduced noise FHR signal by removing sub-segments with detected excess noise;
detecting a plurality of sub-segments of the reduced noise FHR signal corresponding to an average heart rate baseline;
detecting at least two sub-segments of the plurality of sub-segments of the reduced noise FHR signal corresponding to contractions based the input plurality of UP values;
indexing each sub-segment of the detected at least two sub-segments, wherein the indexing comprises assigning a respective feature value to each sub-segment of the detected at least two sub-segments; and
outputting, to a display of the electronic device, a sequence of symbols of the respective feature value assigned to each sub-segment.

### Claim 2 (depends on 1)

The method of claim 1, further comprising detecting that the plurality of sub-segments of the reduced noise FHR signal is free of periods with episodic deviations based on the average heart rate baseline.

### Claim 3 (depends on 1)

The method of claim 1, wherein the average heart rate baseline is an average heart rate free from episodic deviations.

### Claim 4 (depends on 1)

The method of claim 1, further comprising mapping each indexed sub-segment.

### Claim 5 (depends on 1)

The method of claim 1, wherein each symbol of the sequence of symbols is one of Hx values.

### Claim 6

An electronic device for monitoring fetal health, the device comprising:
a processor configured to receive a fetal heart rate (FHR) and a plurality of uterine pressure (UP) values corresponding to the input FHR, and remove artifacts from the FHR and interpolate segments of the FHR;
a feature extractor configured to store time information of segments of the interpolated FHR segments; and
a display,
wherein the processor is further configured to control
searching sub-segments of the stored time information to detect variability of the FHR,
detecting excess noise in the searched sub-segments,
obtaining a reduced noise FHR signal by removing the sub-segments with detected excess noise,
detecting a plurality of sub-segments of the reduced noise FHR signal corresponding to an average heart rate baseline,
detecting at least two sub-segments of the plurality of sub-segments of the reduced noise FHR signal corresponding to contractions based the input plurality of UP values,
indexing each sub-segment of the detected at least two sub-segments, wherein the indexing comprises assigning a respective feature value to each sub-segment of the detected at least two sub-segments, and
displaying, by the display, of a sequence of symbols of respective feature values assigned to each sub-segment.

### Claim 7 (depends on 6)

The device of claim 6, wherein the processor is further configured to control detecting that the plurality of sub-segments of the reduced noise FHR signal is free of periods with episodic deviations based on the average heart rate baseline.

### Claim 8 (depends on 6)

The device of claim 6, wherein the processor is further configured to control detecting that the average heart rate baseline is an average heart rate free from episodic deviations.

### Claim 9 (depends on 6)

The device of claim 6, wherein the processor is further configured to control mapping each indexed sub-segment.

### Claim 10 (depends on 6)

The device of claim 6, wherein each symbol of the sequence of symbols is one of Hx values.