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A method and system for extracting fetal ECG signals from abdominal wall ECG signals

A technology of electrocardiogram and fetal electrocardiogram, applied in medical science, diagnosis, diagnostic recording/measurement, etc., can solve problems such as power frequency interference, fetal electrocardiogram amplitude is not large, fetal electrocardiogram cannot be recognized, and is easy to use , easy to carry effect

Active Publication Date: 2018-01-05
SHANDONG UNIV
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  • Description
  • Claims
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Problems solved by technology

[0014] (3) Power frequency interference
[0016] (4) Baseline drift
[0018] (5) Other noises
[0020] Noise interference such as baseline drift makes the maternal ECG and fetal ECG information in the ECG signal not prominent enough, which makes it difficult to locate the maternal ECG
In addition, because the amplitude of the fetal ECG is relatively small, too much noise can easily cause the fetal ECG to be unrecognizable

Method used

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  • A method and system for extracting fetal ECG signals from abdominal wall ECG signals
  • A method and system for extracting fetal ECG signals from abdominal wall ECG signals
  • A method and system for extracting fetal ECG signals from abdominal wall ECG signals

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Embodiment Construction

[0080] The method for extracting the fetal ECG signal by the abdominal wall ECG signal of the present invention, the specific process is as follows figure 2 As shown, it includes four steps of abdominal wall ECG signal preprocessing, maternal ECG localization, maternal ECG removal and fetal ECG localization.

[0081] (1) Abdominal ECG signal preprocessing

[0082] The ECG signal collected from the abdominal wall contains a lot of noise and the interference of large-value maternal ECG components. The main function of abdominal wall ECG preconditioning is to minimize the interference of other noises outside the maternal ECG. The present invention uses the electrocardiogram denoising method based on wavelet transform to preprocess the abdominal wall electrocardiogram.

[0083] For a finite energy signal x(t), its continuous wavelet transform can be expressed as:

[0084]

[0085] where a and b are scale factor and extension factor respectively, ψ(t) is basic wavelet, ψ a,...

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Abstract

A method and system for extracting fetal ECG signals from abdominal wall ECG signals, the method comprising (1) abdominal wall ECG signal preprocessing; (2) maternal ECG positioning to obtain the position of the R wave; (3) maternal ECG signal preprocessing; (4) Fetal ECG positioning to obtain fetal heart rate. The system includes a microprocessor, a signal acquisition module, a storage module and a wireless network module. The present invention effectively removes all kinds of noise interference from the abdominal wall ECG signal, accurately extracts the fetal ECG signal from the abdominal wall ECG signal, obtains the key physiological indicators such as fetal heart rate, and collects and processes the data in the microprocessor The ECG monitoring system is connected to the user terminal in a wireless way, and there is no need to connect lead wires to the pregnant woman. It is easy to carry, easy to use, and can be used by pregnant women to monitor the status of the fetus at any time for a long time.

Description

technical field [0001] The invention relates to a method and system for extracting fetal electrocardiographic signals from abdominal wall electrocardiographic signals, belonging to the technical field of fetal electrocardiographic signal extraction. Background technique [0002] The development of the economy makes people pay more and more attention to the quality of life, and physical health is the basis for ensuring the quality of life. Prenatal and postnatal care is conducive to the improvement of the health status of the population, and ensuring the health of the fetus during pregnancy is the key to achieving prenatal and postnatal care. If the fetus is hypoxic in the womb, it will endanger the health and even the safety of the fetus. Regular detection of fetal heart activity can obtain the basic physiological parameters of the fetus, and then analyze the health status of the fetus, timely discover fetal abnormalities, such as fetal distress, intrauterine hypoxia, and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/0402A61B5/0444A61B5/344
CPCA61B5/0006A61B5/4362A61B5/6823A61B5/7203A61B2503/02A61B5/344A61B5/349
Inventor 刘常春于忠瀚杨静
Owner SHANDONG UNIV