SU1431732A1 - Tone sensor - Google Patents

Abstract

The invention relates to medical technology. To increase the visibility of the Korotkov tovov sensor, it contains a housing 1, a lid 2, a matching device 3, a piezoelectric element 4 made with two electrode systems, and an insulator layer 5. The lines separating the positive and negative electrodes are located under a constant angle a within O-90. I h. the item of f-ly, 4 ill.

Description

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The invention relates to medical technology and is intended to indicate Korotkoff tones when measuring blood pressure.

The purpose of the invention is to increase the visibility of Korotkov tones by increasing the sensitivity.

FIG. 1 shows the sensor design; in fig. 2 shows the connection of the piezoelectric element to the matching device; on

 FIG. 3 shows an arrangement of electrodes for a piezoelectric disk; in fig. 4 is the same for a piezo-element in the form of a rectangular plate.

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I The sensor contains a housing 1, a cover 2, a matching device 3, a piezoelectric element 4, an insulator layer 5. The piezoelectric element is made with two systems of electrodes 6, 7 and 8, 9.: The positive electrode 6 is connected to the negative electrode 9, the electrodes 7 and I connected with the coordinated device 3 I (Fig. 2). The lines separating the positive I and 6 and 8 and negative 7 and 9 electrodes are located at a constant angle a equal to 0–90 °. FIG. 3 and 4 by a solid line: marked by a line separating the positive electrode, dotted line - the negative electrode.

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To eliminate the closure of the electrodes 6 and 8 on the metal lid 2 between the piezoelectric element and the lid a layer of insulator 5 is laid.

The sensor works as follows.

The sensor is installed under the compression cuff on the inside of the human forearm. The sound vibrations that occur in the tissues when the pressure in the cuff changes, are perceived by the lid 2 and converted by the piezoelectric element 4 into an electrical signal, which is then fed to the matching device 3 (Fig. 2).

Claims (2)

1. A tone sensor containing a hollow body enclosed by a membrane on which a transducer is located, characterized in that, in order to increase the visibility of Korotkov tones by increasing sensitivity, the transducer is made in the form of a flat piezoelectric element with two pairs of electrodes located on both sides of the piezoelectric element. 2. A sensor according to claim 1, characterized in that, in order to ensure the selection of sensitivity, the pairs of electrodes are arranged asymmetrically. 7UT : FIG. 2 Fi.Z / Figm