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 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 present 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 signal gain to offset the weakening of the fetal heart rate and the weakening of the ultrasonic echo signal. Ensure good ultrasound echo signals during uterine contractions, and intelligent control will not cause signal saturation and distortion due to gain changes, so as to obtain good fetal heart sound signals 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 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...

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Problems solved by technology

[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 can also be calculated, including, for example, the sum of the pressure value within the time period, the average value of the pressure value within the time period, and the time period The sum of the squares of internal pressure values, the integral value of pressure values ​​within a time period, etc., or calculate the characteristic value of the strength of the fetal heart sound signal, including: such as the amplitude of the heart sound audio, the periodicity of the heart sound audio, and 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 to control the gain of the ultrasonic signal

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