SU1353424A1 - Ultrasonic vasolocator - Google Patents

Abstract

The invention relates to medical technology. The purpose of the invention is to improve the accuracy of measuring blood flow velocity in the vessel and the distance to it. The device contains a generator I, a modulator 2, a sensor 3, an amplifier 4, a band-pass filter 5, a balanced mixer 6, a low-pass filter 7, an indicator 8 and a frequency divider 9, the output of the band-pass filter through the pulse shaper 10 is connected to the first circuit And, 1.1 The output of which is connected to the output of the selector 12 of the Doppler frequency. A shaper of duration 13 is connected to the modulator 2 and through circuit I 14 to counter 15. Circuit Hj is connected to a counting pulse generator 16. Counter 15 is connected via circuit Hj 17 to an indicator 18. The device can be used to determine the topography of the vessels. 1 il. Sfi cl

Description

The invention relates to medical technology and is intended for ultrasound examination of vessels, measuring blood flow velocity and distance to a blood vessel, as well as determining vessel topography.

The purpose of the invention is to improve the accuracy of measuring blood flow velocity in the vessel and the distance to it.

The drawing shows a structural diagram of an ultrasonic vasolocator.

The device contains serially connected master oscillator I, modulator 2, sensor 3, which includes transmitting and receiving parts, amplifier 4, band-pass filter 5, balanced mixer 6, low-pass filter 7, indicator 8, the second input of the mixer through frequency divider 9 connected to the output of the master oscillator, and the input of the band-pass filter through the driver 10 pulses connected to the first circuit And 11, the second input of which is connected to the output of the selector 12 Doppler frequency, the input of which is connected to the output of the mixer, and The main circuit of the circuit I is connected to the input of a shaper I3 of duration, the second input of which is connected to the modulator, and the output of the shaper of a duration through the second circuit Vi. The second input of this circuit is connected to the counter 15, and the generator is connected to the generator of 16 counting pulses;

The device works as follows.

From the output of the master oscillator 1. operating at a frequency of 5.28 MHz, the output voltage is fed to the input

modulator 2, with the help of which the indicator 18 is the distance to the vessels.

A pulse of duration lig is measured with the frequency of filling of the master oscillator 1 to excite the radiating transducer of ultrasonic vibrations in the sensor 3, which emits a pulse in the direction of the blood vessel.

At the same time, the leading edge of the modulator starts the shaper 13 of duration. The signals reflected from the biostructures are converted into an electrical signal by the receiving part of sensor 3, amplifiers are amplified by a field 4, and the passage through the band pass

f bandpass filter 5

0

0

0

t df, where fd is the frequency of the master oscillator; / if - deviation frequency: corresponding to the values of the blood flow velocity, is fed to the balance input of the mixer 6, the second input of which receives the reference frequency signal from the master oscillator through frequency divider 9, which divides the frequency by two.

The output signal of the balanced mixer, corresponding to the speed of the blood flow through the low-frequency filter 7 with the cut-off frequency 4f, is fed to the speed indicator 8.

In addition, the output signal of the bandpass filter corresponding to the reflected pulse duration

0

filling frequency f ± f, is fed to the input of the pulse generator 10, the output pulse of which is formed on the leading edge of the incoming reflected signal and through circuit 5 II forms the end of the duration of the duration generator 13, and the pulse through the circuit I passes only in the case of a signal the selector 12 of the Doppler frequency, the input signal to which comes from the output of the balanced mixer and indicates the presence and measurement of blood flow velocity.

The presence of a signal about the location of the blood flow structure produces a resolution to measure the distance to this structure - the vessel. The output signal of the imaging unit 13 of duration through And 14, the second input of which receives the voltage of the counting pulses generator, goes to the counter, the output of which through the K 17 circuit, controlled by the signal of the frequency selector, goes to

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Claims (1)

Formula isobteni An ultrasonic vasolocator containing series-connected master oscillator, modulator, sensor, amplifier, characterized in that, in order to improve the accuracy of measuring blood flow velocity in the vessel and the distance to it, sequentially connected band-pass filter, balanced mixer, filter are introduced into the device low frequency, pew indicator, and the input bandwidth is 1353A2i The VOGO filter is connected to the output of the usi-circuit I and is connected to the input of the counter, the lighter, and the output of the band-pass filter output of which is connected to the first input is connected to the input of the former by the third circuit I, the second input of the pulses, the output of which is connected to the output of the selector is the first input of the first circuit And, the output of the Doshter frequency and the second input of which is connected to the first input of the first pre-first circuit And, the output of the third circuit of the duration, the second input and connected to the input of the indicator, and which is connected to the second output of the selections the torus of the Doppler frequency of the modulator, and the output of the imaging device is connected to the output of the balanced mixture; the output is connected to the first inlet; the output of the frequency divider is connected to the second input of the second mixer; the second input is connected to the output of the generator, and the input is a frequency divider of the connecting pulses, and the output of the second one is with the output of the master oscillator.