A method for monitoring heart sound signals and a heart sound signal monitoring device

Abstract

The embodiment of the invention discloses a method for monitoring heart sound signals and a heart sound signal monitoring device. The method includes: pasting a metal electrode moving piece on the abdomen skin of a pregnant woman, and connecting the metal electrode moving piece to one end of a capacitance measuring circuit, the metal electrode moving piece is in mechanical contact with the skin but electrically insulated; the distance between the metal electrode moving piece and the metal electrode moving piece is Fix a metal electrode static piece at the position of the preset distance threshold and connect it to the other end of the capacitance measurement circuit; use an elastic medium to connect the metal electrode moving piece with the metal electrode static piece, and adjust the elastic modulus of the metal electrode moving piece The value is similar to the elastic modulus of the pregnant woman's skin; when monitoring the fetal heart sound signal, the capacitance measurement circuit is used to detect the capacitance change caused by the change of the distance between the metal electrode moving piece and the metal electrode static piece, and based on the detected capacitance change, the Fetal heart sound signal. By applying the present invention, the accuracy rate of fetal heart sound signal monitoring can be improved and the monitoring cost can be 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...

AI Technical Summary

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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