Method and device for monitoring heart sound signal

Abstract

An embodiment of the invention discloses a method and device for monitoring a heart sound signal. The method comprises the steps that a metal electrode moving plate adheres to the abdominal skin of a pregnant woman, and is connected to one end of a capacitance measuring circuit, and the metal electrode moving plate and the skin make mechanical contact with each other and are electrically insulated; a metal electrode static plate is fixed and connected to the other end of the capacitance measuring circuit, wherein the distance between the metal electrode moving plate and the metal electrode static plate is a preset separation distance threshold value; the metal electrode moving plate and the metal electrode static plate are connected through an elastic medium, and the elastic modulus of the metal electrode moving plate is adjusted to be close to the elastic modulus of the skin of the pregnant woman; when monitoring of the fetal heart sound signal is conducted, the capacitance change caused by the change of the separation distance between the metal electrode moving plate and the metal electrode static plate is detected through the capacitance measuring circuit, and the fetal heart sound signal is obtained on the basis of the detected capacitance change. When the method and device for monitoring the heart sound signal are applied, the accuracy rate of monitoring of the fetal heart sound signal can be improved, and the monitoring cost is reduced.

Description

technical field [0001] The invention relates to fetal monitoring technology, in particular to a method for monitoring heart sound signals and a heart sound signal monitoring device. Background technique [0002] Fetal monitoring is an important means to ensure the safety of perinatal mothers and fetuses and to achieve prenatal and postnatal care. Fetal movement (fetal heart sound signal) is the activity of the fetus in the uterus of a pregnant woman. It is one of the most important physiological signals of the fetus. The fetal heart sound signal contains a large number of various parts of the fetal heart, such as atrium, ventricle, great blood vessels, and cardiovascular And the physiological and pathological information of the functional status of each valve. The number of times, speed, and strength of the fetal heart sound signal indicates the safety of the fetus in the mother's body. The fetal heart sound signal in the uterus is strong and powerful, indicating that the f...

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Problems solved by technology

However, due to the relatively large difference in elastic modulus between the air and the mother's skin, there is a large energy loss when the vibration energy of the fetal heart sound signal is transferred from the mother to the air to push the air to vibrate to generate longitudinal waves; further, the high-sensitivity microphone sensor The size of the diaphragm is generally in the order of square microns, and it is difficult to concentrate the longitudinal wave energy on the tiny diaphragm; moreover, because the fetal heart sound signal itself is very weak, plus the above-mentioned loss of longitudinal wave energy in the air space and the tiny diaphragm is difficult Concentrating longitudinal wave energy makes it difficult to detect stable fetal heart sound signals, and the accuracy of fetal heart sound signal monitoring is not high, which affects the quality of monitoring

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