Method and device for determining fetal heart sounds by passive sensing and system for examining fetal heart function

A fetal heart and sound technology, applied in the measurement of pulse/heart rate, sensors, telemetry patient monitoring, etc., can solve the problems of not improving sensitivity and accuracy, and reducing sensitivity and accuracy.

Active Publication Date: 2017-05-31
JIANGSU SHINSSON HEALTH TECH CO LTD
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Problems solved by technology

[0006] According to known schemes, the aim is to filter out the signal generated by the periodic heartbeat from the detected noise-laden signal by means of autocorrelation, which results in a lower amplitude aperiodic signal (essentially noise ) decreases bu

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  • Method and device for determining fetal heart sounds by passive sensing and system for examining fetal heart function
  • Method and device for determining fetal heart sounds by passive sensing and system for examining fetal heart function
  • Method and device for determining fetal heart sounds by passive sensing and system for examining fetal heart function

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Embodiment Construction

[0038] figure 1 An undisturbed acoustic (phonocardiogram) signal of fetal heart sounds is shown. In this figure, two characteristic signals S1 and S2 corresponding to the opening (S1) and closing (S2) of the fetal heart valve can be easily seen; the instantaneous heart rate (instantaneous FHR) is based on the difference between the subsequent signals S1 or S2 The time difference is fixed.

[0039] exist figure 2 The main steps of the method according to the invention are illustrated in . In the course of the method, phonocardiographic signals obtained from the abdominal wall of the mother by passive sensors are amplified, digitized, filtered, and subjected to autocorrelation with a time window of predetermined size, and as a result of the autocorrelation the obtained The signal sequence is processed by a fuzzy expert system.

[0040] During processing, the obtained signal as a result of autocorrelation is analyzed using a rule set of decision logic stored in a knowledge b...

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Abstract

In the method according to the invention a phonocardiographic signal, obtained by a passive acoustic sensor (10) from a maternal abdominal wall, is pre-filtered, amplified, digitized, digitally filtered by means of a programmable amplifier and filter unit (20), is stored in an intermediate memory and autocorrelation is performed by means of an autocorrelation unit (30) in a time window of a predetermined size. The signals obtained as a result of autocorrelation are fed to an input of a fuzzy expert system (40), wherein local maximums of the signals, temporal location of the local maximums and variation of the temporal location of the local maximums are determined by the fuzzy expert system (40), and, applying those as input parameters or signals of the fuzzy expert system, those are classified into probability groups utilizing a fuzzy rule set of a decision logic stored in a knowledge base and biologically expected data and are evaluated.

Description

technical field [0001] The present invention relates to a method for determining fetal heart sounds by passive sensing and a device for implementing the method, preferably the device can be used in a home environment and preferably , the device can also be applied to telemedicine. The invention also relates to a system for examining fetal heart function. Background technique [0002] It is known that clearly interpretable measurements of fetal cardiac function can only be obtained with tests of longer duration (approximately 20 minutes); A phenomenon associated with a possible symptom of a disease. [0003] The type of measurement most commonly used today is the ultrasound method based on the Doppler principle, which is an active method and thus involves continuous energy irradiation over a non-negligible period of time and does not Suitable for unsupervised testing at home. The choice of passive methods suitable for examining fetal cardiac function is very limited, prim...

Claims

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Application Information

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IPC IPC(8): A61B7/00A61B5/00A61B5/344
CPCA61B5/0002A61B5/7264A61B7/00A61B2503/02A61B8/02A61B5/344
Inventor 伊姆雷·鲍尔托什伊姆雷·尤哈斯亚诺什·卡尔迪尚多尔·谢雷什伊什特万·塞凯伊米科洛什·托罗克
Owner JIANGSU SHINSSON HEALTH TECH CO LTD
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