SU1337044A1 - Apparatus for analysis of blood flow - Google Patents

Abstract

A device for analyzing blood flow in the arteries and veins contains a recorder 16, an ultrasound driving oscillator 1, an amplifier 2, power, an electro-acoustic sensor 3, an amplitude detector 4, a low frequency amplifier 5, and a telephone 6. In order to enhance functionality by measuring venous blood A differentiation unit 7, an integration unit 8, quadratic detectors 9, 10, 11, filters Г2, 13, 14 low frequencies, a division unit 15 and a switch 17 of the type of operation have been entered into it. (L 00 with vj 4 4

Description

The invention relates to medical technology and can be used to diagnose diseases of the arteries and veins in mass surveys of the population both in the field and in hospital conditions.

The aim of the invention is to improve the measurement accuracy and expand the functionality of the device by measuring the venous blood flow.

FIG. 1 shows a structural diagram of a device for analyzing blood flow in the arteries and veins,

The device contains an ultrasonic driving oscillator 1, power amplifier 2, electro-acoustic sensor 3, amplitude detector 4, low frequency amplifier 5, telephone 6, differentiation unit 7, integration unit 8, quadratic detectors 9, 10 and 11, lower filters 12, 13 and 14 frequency block 15 division, the recorder 16 and the switch 17 of the kind of work.

The device works as follows.

The ultrasonic master oscillator 1 generates a harmonic electrical signal, which through the power amplifier 2 is fed to an electroacoustic sensor 3, in which it is converted into ultrasonic vibrations concentrated in the area of blood flow being examined. The ultrasonic wave reflected from the mobile blood flow is sensed by the same sensor 3. At the same time, the frequency of reflected oscillations is shifted by the Doppler frequency shift proportional to the speed of the blood flow. These beats are extracted by the amplitude detector 4, amplified by the low-frequency amplifier 5, and are fed to the telephone 6, which is used for auditory monitoring of the correct installation of the sensor 3 in accordance with the test vessel.

Simultaneously from the output of the amplifier 5 low frequency signal is fed to the inputs of three parallel channels. In the first channel, the signal is differentiated by a differentiation unit 7, detected by a quadratic detector 9 and averaged by the filter 12 of the lower parts

five

0 5

5 45 50

55

hundred In the second channel, the sieve is integrated by the integration unit 8, detected by a quadratic detector

10 and averaged by the low pass filter 13. In the third channel, the signal is detected by a quadratic detector.

11 and averaged by low pass filter 14.

Depending on the selected mode of operation, determined by the position of the switch 17 of the type of operation, either the signal from the output of the first channel or the signal from the output of the second channel passes to the first input (input of the dividend) block 15. The second input (divider input) of dividing unit 15 is constantly receiving a signal from the output of the third channel. In the first case, the output of dividing unit 15 produces a voltage proportional to the rms frequency of the instantaneous Doppler spectrum. This mode is advisable to use in the study of arterial blood flow, the rate of which is much higher than venous. In the second case, the output of dividing unit 15 produces a voltage proportional to the rms value of the instantaneous spectrum of the Doppler signal. This mode should be used at low blood flow rates, i.e. in the study of venous circulation. The signal from the output of the division unit 15 is recorded by the recorder 16.

The device allows to investigate the state of the vessels both at high and at low blood flow rates.

Claims (1)

Invention Formula A device for analyzing the blood flow, comprising a recorder and an ultrasound master oscillator, a power amplifier, an electroacoustic sensor, an amplitude detector, a low frequency amplifier and a telephone, in series, in order to enhance the functionality by measuring the venous blood flow, integration, differentiation and division blocks, three quadratic detectors, three low-pass filters, a switch of the type of operation, while the inputs of the integration blocks and derivations are connected to the output of the amplifier 3133704A4 low frequency, and their outputs respectively — which through successively through the first and second quadratic third quadratic detector tichnye detectors, and the first and second and third low pass filter connect low-pass filters and a switch to the output of the amplifier; a low-frequency type of work is connected to the primary, and the output of the divider is connected The input to the input of the division unit, the second input with the input of the recorder.