SU1463225A1 - Tone sensor - Google Patents

Abstract

The invention relates to medical technology, in particular to devices for measuring blood pressure. The purpose of the invention is to provide sensitivity control. The tone sensor contains body 1, membrane 2, piezoelectric elements 3 and 4 mounted on membrane 2. Electrode 5 of piezoelectric element 3 is connected to the inlet, and electrodes 6 and 7 are connected to the output of amplifier 8. Pulse wave is sensed by membrane 2, which deforms piezoelectric element 3. From electrode 5 of piezoelectric element 3, the signal is fed to the input of amplifier 8, the output of which is the output of the device. 2 Il.

Description

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1463225

i The invention relates to medical technology, in particular for measuring arterial blood pressure according to the Korotkov method.

The aim of the invention is to provide adjustment of the sensitivity of the sensor by introducing electromechanical feedback.

FIG. 1 shows a sensor; in fig. 2 - connection diagram of piezoelectric elements. : The sensor of Korotkov tones (Fig. 1) contains a housing 1, a membrane 2, piezoelements 3 and 4. Piezoelectric element 3 has 5 basic 6 additional electrodes. The piezoelectric element has an electrode 7, the polarity of which is opposite to the polarity of the electrodes 5 and

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they are absorbed by the membrane 2 and the piezoelectric element 3 is converted into an electrical signal at the input of amplifier 8, using trimmers 9 and 10, the wave can be reduced to the optimum value when adjusting the sensitivity of the sensor by introducing negative reverse electromechanical communication through electrodes 6 and 7 piezoelectric elements 3 and 4.

Claims (1)

Invention Formula A tone sensor, comprising a housing, a membrane with a piezoelectric element fixed on it, connected by a single electrode with amplification of the polarity of the electrodes of the electrode, connecting and connecting the sensor.  piezoelement 3. The electrodes are a piezoelectric element, and the other across the membrane - with an obt ..., f, j jf, t 111 n i f p ITGL G 3 and 4, opposite to the electrodes, are connected to the membrane and the common circuit iodine. Electrode 5 is connected to the input of Aom amplifier 8. The output of the amplifier through conductor, characterized in that, in order to ensure sensitivity control, it is provided with a second piezoelectric element, dim ycnjm.c.m and. . , ..., .. installed on the membrane of opposite polarity and resistor 9 and 10 are connected to the first piezoelectric element and connected (1) respectively to the electrodes 6 and 7. to the output of the amplifier through the first I The sensor works as follows. the trimmer resistor, and the first piezoelele sensor is installed on the internal position, it is equipped with an additional electrode, and the person's forearm under the compression is connected to the output of the amplifier through the cuff. The sound vibrations are perceived by the second trimming resistor. /: 0 they are absorbed by the membrane 2 and the piezoelectric element 3 is converted into an electrical signal at the input of amplifier 8, using trimmers 9 and 10, the wave can be reduced to the optimum value when adjusting the sensitivity of the sensor by introducing negative reverse electromechanical communication through electrodes 6 and 7 piezoelectric elements 3 and 4. Invention Formula The tone sensor, comprising a housing, a membrane with a piezoelectric element attached to it, connected by a single electrode with a usit, connects and forms the sensor.  the other, through the membrane - with