SU1194390A1 - Apparatus for determining the index of peripheric vascular resistance - Google Patents

Abstract

A DEVICE FOR DETERMINING A PERIPHERAL VASCULAR RESISTANCE INDEX, containing a first comparator, a series-connected pulse generator and an element And, a series-connected second comparator and a first group of elements And, a series-connected third comparator and a second group of elements And, and a series-connected arithmetic unit and display unit, so that, in order to reduce the time of the survey, a trigger is inserted in it that is connected between the first comparator and the element And, the analog-digital converter, whose information input is connected to the input bus, the control input - with the output of the element I, and the output - with the inputs of the first and second groups of elements And, connected in series the first differentiator, whose input is connected to the input bus, and the second differentiator, the input of which is also connected to the input of the second comparator, and the output - to the input of the third comparator, the first register connected between the output of the first group of elements And and the first input of the arithmetic unit, the second register is switched on between the output of the second group of elements And and (L the second input of the arithmetic, and the pulse distributor, the first input of which is connected to the output of the pulse generator, the second input to the output of the third comparator, the first output to the second input of the trigger, the second output to the control socket input display unit. 4 00 09

Description

The invention relates to mediation technique, namely to devices for studying the cardiovascular system. The aim of the invention is to reduce the inspection time. FIG. 1 shows a block diagram of a device for determining the peripheral vascular resistance index; in fig. 2 - voltage diagrams illustrating the operation of the device. The device contains the first comparator 1, analog-digital converter 2, element IZ, trigger 4, generator 5 pulses, distributor 6 impulses, first differentiator 7, second comparator 8, second differential 9, third comparator 10 ,. The first 11 and second 12 group of elements are And, the first 13 and second 14 register1, the arithmetical 1 unit 15 and the display unit 16. The information input of the analog-digital converter 2 and the input of the first differentiator 7 are connected to the input NINA 17. The outputs of the registers 13 and 14 are connected through the arithmetic unit 15 to the code of the display unit 16, the first input of the first comparator 1 is connected to the first level, by the reference code 19 and on the year of the first d, if (on 7, Rhoograph 19) connects to the input of an angular digitizer converter 2, second and third ones;: 6 pm distributor odes 1 pulses padgiocheni according to the input of the arithmetic unit 15 and the 16 indica block) u1Io B Yod first comparator 1 is connected to the first input of the flip-flop 4 whose output is connected to the first output of AND gate 3, and BTopoii trigger input 4 is connected to the first output distributor 6 pulses pervsh whose input is connected to the second input of AND gate 3 and the output of the generator 5 pulses. The output element And 3 is connected to the input of analog-digital converter 2, the output of which is connected to the first input of the first and second groups 11 and 12 elements And, respectively, the outputs of which are connected to the inputs of registers 13 and 14, respectively. The second input of the first group 11 elements And connected to the output of the second comparator 8, the first input of which is connected to the output of the first 7 and the input of the second 9 differentiators. The second input of the second comparator. 8 is connected to the zero level bus 20, which is connected to the second input of the third comparator 10, the first input of which is connected to the output of the second differentiator 9. The output of the third comparator 10 is connected to the second input of the distributor, 6 pulses and the second input of the second groups of 12 elements I. The device works as follows. The input bus 17 of the device receives a signal from the output of rheograph 19 (Fig. 2q). This signal also goes to the inputs of the first comparator 1, the converter 2 and the differentiator 7. When comparing the voltage on the device bus 17 with the voltage of the initial cutoff level on the bus 18, the comparator 1 produces a pulse (FIG. 2B), which is fed to the trigger 4 ( which was previously set to one). The trigger output signal corresponding to the level of the logical unit permits the passage of the pulses of the clock frequency of the generator 5. through the element Z. Each pulse, generator 5, entering the input of the converter 2, extracts the voltage signal of the resistor, in addition, the signal from the output of the comparator 10 provides starting the distributor 6. The distributor 6 generates clock sync pulses that, on the one hand (the first group of inputs of the distributor), ensure the operation of the divider. The voltage from the output of the rheograph 19 goes to the input bus 17 of the device - and, moreover, to the differentiator 7, which separates the first derivative of the input signal (Fig. 2B). The first derivative of the input signal is fed to the second comparator 8, to the second input of which the cut-off voltage is applied, corresponding to the level of the logical, zero, bus 20 of the device. When the voltage coming from the output of the differential switch 7 and the voltage corresponding to the zero level are equal, a pulse signal is drawn (Fig. 2g), which provides the reading of information from the output register of the converter 2 through the first group 11 of elements AND to the input of register 13. The value of the voltage code stored on register 13 corresponds to the maximum value of the rheosignal, so

as the moment of occurrence of a pulse at the output of the comparator 8 (realizing the function of comparing the input voltage with the zero level) corresponds to the moment when the signal of the first derivative of the isolines intersects (the inflection point). Accurately, a differentiator 9 generates at the output a signal of the second derivative of the investigated rheosignal (Fig. 22). The comparator 10 detects a pulse signal at the output, the moment of occurrence of which corresponds to the maximum value of the rate of change of the first derivative of the signal under investigation (Fig. 2e). Thus, in the register 14 through the second group of elements And 12 recorded code value of the voltage reosigna194390, 4

la at the moment of time when its rate of decrease in the diastole phase has a maximum value. This point in time corresponds to the point of intersection of the arterial component isolation and the maximum value of the systolic venous pulsation.

Automating the processing of a rheogram using the proposed device makes it possible to shorten the examination time, eliminate subjective errors in evaluating the index of peripheral vascular resistance, determine the index of peripheral vascular resistance instantaneously lively, and increase the accuracy and reliability of diagnostics.

-A..A.

D- ™ L

Claims (1)

DEVICE FOR DETERMINING A PERIPHERAL VASCULAR INDEX INDICATOR, comprising a first comparator, a pulse generator in series and an AND element connected in series with a second comparator and a first group of elements AND, connected in series with a third comparator and a second group of elements AND, and an arithmetic unit and an indication unit connected in series, characterized in that, in order to reduce the time of the examination, a trigger is inserted into it, included between the first comparator and the element And, analog an o-digital converter, the information input of which is connected to the input bus, the control input is with the output of the And element, and the output is with the inputs of the first and second groups of And elements, the first differentiator, the input of which is connected to the input bus, and the second differentiator, the input, are connected in series which is also connected to the input of the second comparator, and the output to the input of the third comparator, the first register included between the output of the first group of AND elements and the first input of the arithmetic unit, the second register included between the output of T swarm group of AND gates and the second input of the arithmetic bdoka and pulse distributor, a first input of which is connected to the output of the pulse generator, the second input to the output of the third comparator, the first output - to the second input flip-flop, the second output - to the control input of the indication unit. (WTT