RU1810045C - Method and device for recording rheographic and bioelectric signals - Google Patents

Abstract

Usage: for the study of hemodynamics and bioelectric activity of the body. The invention makes it possible to increase the reliability of recording rheographic and bioelectric signals by reducing the electrode and interstitial polarization. The inventive piezoelectric plate 4, on the opposite sides of which the main 3 and additional 5 electrodes are deposited, are superimposed on the surface of the body 8. Ultrasonic generators 6,7 excite the piezoelectric plates 4, which emit ultrasonic vibrations into the body 8. The alternating current generated by the current source 1, is passed through the main electrodes 3, between which a potential difference is recorded with an amplifier 2, which is numerically equal to the impedance of a portion of the body. 2 s and 1 s.p. f-stars, 1 ill. w fe

Description

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The invention relates to a medical diagnostic technique, in particular to methods and devices for studying the hemodynamics and bioelectric activity of an organism.

The purpose of the invention is the reduction of electrode and interstitial polarization and the focusing of electric current.

The method is carried out as follows.

Electrodes are placed on the surface of the body through which electric current is passed, ultrasound acts on the body in the area of its contact with the electrodes, the electrical resistance is measured between the electrodes, and when the electric current is disconnected, a bioelectric signal is recorded between the electrodes.

In addition, in order to further reduce the electrode resistance, an electrically conductive paste is placed between the electrodes and the body.

The drawing shows a device for implementing the proposed method.

The device contains a current source 1, the outputs of which are connected respectively to the inputs of the measuring amplifier 2 and the main electrodes 3, the first, second piezoceramic plate 4, at the opposite ends of which the main 3 and additional 5 electrodes are sprayed, the first 6 and second 7 ultrasonic generators, the outputs of which are connected respectively, with the main 3 and additional 5 electrodes of the piezoelectric plates 4.

Electrodes are placed on the surface of the body 8, located above the blood-stained pool 9, for example, an artery, so that the main electrodes 3 are pressed against the surface of the body. An electric current generated by the current source 1 is passed between the main electrodes 3. The first and second ultrasonic generators 7 excite the piezoceramic plates 4, which emit ultrasonic vibrations deep into the body 8. Ultrasonic vibrations of low intensity (pre-cavitation power) act on electrochemical processes due to electrolytes of acoustic flows, which cause mixing of the electrolyte, equalize the ion concentration, which leads to a decrease in polarization. Ultrasonic vibrations, reducing electrode and interstitial polarization, contribute to the concentration of electric current. Upon reaching the blood-filled pool, the electric current closes through the blood,

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since its electrical resistance is several times lower than the resistance of surrounding tissues. Using the measuring amplifier 2, by registering the potential difference between the main electrodes, the electrical resistance of the blood-filled pool is determined, since the resistance, when calibrated, is equal to the potential difference between the main electrodes.

When the external probe electric current is turned off between the main electrodes, a bioelectric signal is recorded: an electrocardiogram, an electroencephalogram, a skin-galvanic potential, etc.

To further reduce the transition resistance, an electrically conductive paste is placed between the electrodes and the body. In this case, ultrasonic vibrations facilitate the penetration of paste ions into the epidermis, thereby reducing the resistance of the epidermis.

A decrease in the electrode and interstitial polarization reduces their influence on the rheographic and bioelectric signals, thereby increasing the accuracy of the measurement of these signals.

Claims (3)

1. The method of recording rheographic and bioelectric signals, including the imposition of electrodes on the surface of the body, through which electric current is passed and between which an electrical resistance is measured, characterized in that, in order to reduce the electrode and interstitial polarization and achieve the effect of focusing an electric current, ultrasound acts on the body in the area of its contact with the electrodes; when the electric current is disconnected, a bioelectric signal is recorded between the electrodes. 2. The method according to claim 1, characterized in that, in order to further reduce the electrode resistance, an electrically conductive paste is placed between the electrodes and the body. 3. A device for recording rheological and bioelectric signals, comprising a current source whose outputs are connected to two electrodes and inputs of a measuring amplifier, as well as an ultrasonic generator connected to a radiator, characterized in that it is equipped with a second ultrasonic generator connected to a second radiator, radiators made in the form of plates, on one side of which are installed main-main and additional connected to electrodes, and on the other side with additional ultrasound generators, while the electrodes are paired.