Pre-amplifier and medical piezoelectric film sensor

Abstract

The invention relates to the technical field of medical equipment, and discloses a pre-amplifier and a medical piezoelectric film sensor. The pre-amplifier comprises a charge amplification circuit, a first-stage filter, a second-stage filter and a level raising circuit; the input end of the charge amplification circuit is connected with an electrode on a piezoelectric film of the piezoelectric film sensor, the output end of the charge amplification circuit is connected with the input end of the first-stage filter, and the output end of the first-stage filter is connected with the input end of the second-stage filter; the output end of the second-stage filter is connected with the input end of the level raising circuit, the output end of the level raising circuit is connected with the signal acquisition end of a microprocessor of the piezoelectric film sensor, the first-stage filter is used for eliminating power frequency interference, and the second-stage filter is used for eliminating high-frequency interference. The pre-amplifier accelerates the development of a medical sleep monitoring system towards the direction of higher accuracy, miniaturization and low cost.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a preamplifier and a medical piezoelectric film sensor. Background technique [0002] The hospital bed monitor senses various physiological changes through the sensor, then the amplifier strengthens the information, and then converts it into electrical information. After the software is processed, the data will be displayed on the display screen. When the monitoring data exceeds the set index, the alarm system will be activated and an The signal draws the attention of medical staff. After the monitor passes the electrocardiographic stimulation, the electrical signal generated by the excitement is transmitted to the human epidermis, and the probe monitors the changing potential to obtain the electrocardiographic waveform, and then obtain the heart rate. The monitor obtains the impedance electrical signal through the change of the body impedance and the lung impedance du...

AI Technical Summary

Problems solved by technology

Because the measurement principle of the hospital bed monitor is to obtain the ECG signal to extract the heart rate, and to obtain the body impedance change to extract the respiratory rate, it needs additional electrodes to be attached to specific body parts of the patient to perform measurement. It is not suitable for monitoring in the sleep state. Convenient, in addition, the monitor is large in size and high in cost, and cannot be widely promoted in the sleep bed monitoring system

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