Method and device for improving fetal heart sound signal collecting quality

Abstract

The invention relates to the technical field of medical monitoring, in particular to the technical field of medical fetus monitoring, and particularly relates to a method and device for improving fetal heart sound signal collecting quality. According to the technical scheme, uterine contraction which is performing is recognized by the utilization of the judgment for uterine contraction values, the influences on ultrasonic echo signals caused by the fact that the fetal heart beat weakens are eliminated through the method for controlling signal gains intelligently, good ultrasonic echo signals during uterine contraction are guaranteed, and due to intelligent control, changes of the gains cannot cause signal saturation and distortion. Thus, good fetus heart sound signals can be obtained and high-quality signals are provided for follow-up processing.

Description

technical field [0001] The invention relates to the technical field of medical monitoring, in particular to the technical field of medical fetal monitoring, in particular to a method and a device for improving the quality of fetal heart sound signal collection. Background technique [0002] Ultrasonic Doppler fetal monitors transmit ultrasonic signals, and then receive ultrasonic echo signals from the fetal heart, because the fetal heart is constantly beating, using the principle of ultrasonic Doppler, the echo signal will have a certain frequency shift , the current fetal monitors use the echo demodulation amplifier circuit to analyze the frequency offset value from the ultrasonic echo signal, because it corresponds to the fetal heartbeat, so using this frequency offset signal can be further The processing obtains the heart rate value of the fetus. [0003] The ultrasonic emission of traditional fetal monitor is a fixed value. Pregnant women will have frequent uterine con...

AI Technical Summary

Problems solved by technology

Pregnant women will have frequent uterine contractions during childbirth. When strong uterine contractions occur, the force of fetal heartbeat will be weakened due to the blockage of umbilical cord blood flow. Both the ultrasonic signal and the ultrasonic echo signal to the fetal heart are attenuated more. These two factors make the collected fetal heart sound signal much smaller than when no uterine contraction occurs, or even undetectable, while the traditional fetal monitor No special processing will be done on the magnification of the signal for this situation, so that the fetal heart rate curve cannot be calculated during uterine contraction, and the effect and efficiency of fetal monitoring will be affected

[0004] If you have been using a larger gain multiple, when there is no uterine contraction or the fetal heart signal is strong, you may obtain a signal that is saturated and distorted due to excessive gain

[0005] In addition, at present, according to the collected maternal uterine pressure signal and fetal heart sound signal, although the characteristic value of the uterine contraction pressure intensity is also calculated, including, for example, the pressure within the time period The sum of values, the average value of the pressure value within the time period, the sum of the squares of the pressure value within the time period, the integral value of the pressure value within the time period, etc., or calculate the characteristic value of the strength of the fetal heart sound signal, including: such as heart sound audio The amplitude of the heart sound audio, the periodicity of the heart sound audio, the amplitude of the heart sound audio envelope, the periodicity of the heart sound audio envelope, the square sum of the heart sound audio envelope, etc., but they are only used for doctors to understand according to the actual situation, and are not used for ultrasound signal gain control

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