Fetal heart sound monitoring instrument based on piezoelectric thin-film sensor

Abstract

The invention discloses a fetal heart sound monitoring instrument comprising a piezoelectric thin-film sensor, a control circuit and a display component, wherein the control circuit and the piezoelectric thin-film sensor are electrically connected by a conducting wire. According to the fetal heart sound monitoring instrument, the mechanical vibration of the skin of the abdomen of a pregnant woman, which is caused by the palpitation movement of a fetus in the abdomen of the pregnant woman, is sensed by adopting the piezoelectric thin-film sensor and is also converted into a corresponding charge signal, the treatment of amplification, filtration, analog-to-digital conversion, separation and the like is carried out on the charge signal by the control circuit, and finally, a corresponding monitoring result is obtained by output. The fetal heart sound monitoring instrument disclosed by the invention has the advantages of signal monitoring sensitivity, accuracy and good linearity, easy production and manufacture and the like. The fetal heart sound monitoring instrument has more advantages that the fetal heart sound monitoring instrument disclosed by the invention is convenient to use and does not have any injuring action to a mother and a child, so that the fetal heart sound monitoring instrument can be used as a medical auxiliary instrument which is between a fetal heart stethoscope and an ultrasonic Doppler fetal heart sound detecting instrument and is used for clinical diagnosis and the self checking of the pregnant woman.

Description

【Technical field】 [0001] The invention relates to the technical fields of sensors and medical care, in particular to a fetal heart sound monitor. 【Background technique】 [0002] The purpose of fetal heart sound monitoring is to diagnose fetal heart function and central nervous system function by listening to the fetal heartbeat, and avoid irreversible damage to the fetal central nervous system caused by the deterioration of the uterine environment on which the fetus depends. From the 20th week of pregnancy until the full-term pregnancy can be delivered safely, continuous and regular fetal heart sound monitoring is of great significance to ensure the healthy development of the fetus' body and intelligence. The size of the fetal heart rate is an important indicator of fetal heart sound monitoring. [0003] The early method of fetal heart sound monitoring is to monitor the fetal heart rate with earpiece or microphone type fetal heart sound stethoscope, which has the disadvanta...

AI Technical Summary

Problems solved by technology

[0003] The early fetal heart sound monitoring method is to use the earpiece or microphone type fetal heart sound stethoscope to monitor the fetal heart rate, which has the disadvantages of large error, poor anti-interference ability, and manual counting.

[0004] At present, the fetal heart sound monitoring method widely used in major hospitals is the ultrasonic Doppler fetal heart monitor, which uses the Doppler effect generated by the ultrasonic wave to pick up the fetal heartbeat signal and process it in real time through the follow-up circuit. Anti-interference, strong real-time performance, electronic counting and storage, etc., but there is no accurate statement on the safety of medical ultrasound, and there are still potential dangers to the mother and baby.

At the same time, because medical ultrasound cannot be transmitted in the air, every time an ultrasound probe is used to monitor the abdomen of a pregnant woman, in order to remove the air between the probe and the skin, an ultrasound "coupling agent" must be applied to the abdomen of the pregnant woman, which will bring discomfort to the pregnant woman In addition, poor quality "coupling agent" will not only cause the loss of ultrasonic energy, but also irritate the skin and damage the ultrasonic probe

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