Method and device for improving quality of fetal heart sound signal acquisition

Abstract

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. The technical solution provided by the invention uses the judgment of the value of the uterine systolic pressure to identify the ongoing uterine contraction, and uses the method of intelligently controlling the amount of ultrasonic emission to counteract the weakening of the fetal heart rate and the density of the uterine muscle wall due to contraction. Larger, the effect on the increase of ultrasonic impedance and the increase of ultrasonic attenuation ensures a good ultrasonic echo signal during uterine contraction, and intelligent control will not cause unsafe ultrasonic emission or signal due to changes in the amount of ultrasonic emission. Saturation and distortion, so as to obtain a good fetal heart sound signal, and provide high-quality signals for subsequent 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 analyze the frequency offset value, because it corresponds to the fetal heartbeat, so the frequency offset signal can be used to obtain the fetal heart rate value through further processing. [0003] The ultrasonic emission of traditional fetal monitor is a fixed value. Pregnant women will have frequent uterine contractions during childbirth. When strong uterine contractions occur, the force of f...

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 attenuate more. These two factors make the collected fetal heart sound signal much smaller than that of the non-contraction, or even undetectable, so that the fetal heart rate during the uterine contraction The curve cannot be calculated, and the effect and efficiency of fetal monitoring are affected

[0004] If a large ultrasonic signal is continuously emitted, on the one hand, the pregnant woman and the fetus will be exposed to strong ultrasonic radiation, and on the other hand, there will be no contraction When , the acquired signal may be too strong, resulting in saturation distortion

[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 square sum 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 emission control

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