SU1540800A1 - Device for measuring electrocardiogram signal parameters - Google Patents

Abstract

The device for changing the parameters of the electrocardiogram (ECG) signals contains a series-connected master oscillator 1, a shaper 2 of a television signal ECG, a modulator torrent 3 and a television receiver (TF) 4, as well as a scaling unit 5 and a series-connected shaper 6 sighting marks, shaper 7 counting pulses and an indicator 8. Reducing the measurement error of the time and amplitude parameters of the ECG signals is provided by using a imager 6, which forms mobile visions. plots to select the measurement area of the ECG signal of the block 5, with which you can smoothly change the image scale on the screen of the TP 4 horizontally and vertically, and automatically digitally read the measurement results using the imaging unit 7 counting pulses and digital indicator 8, which eliminates the influence nonlinearity of TP 4 scans on the accuracy of measurement of parameters of ECG signals. 1 il.

Description

(21) 4091930 / 28-14

(22) 04/09/86

(46) 07.02.90. Bul № 5

(72) A.N. Backman, V.P. Tikhonov

and M.S. Sosina

(53) 615.47 (088.8)

(56) Telecard-2 MW. Catalog of medical electronic devices. -M., Publishing house of the Central Research Institute of Electronics, 1985, vol. 2, s. 169.

(54) DEVICE FOR MEASURING PARAMETERS OF ELECTROCARDIOGRAPH SIGNALS

(57) A device for measuring parameters of an electrocardiogram (ECG) signal contains a series-connected master oscillator 1, an ECG television signal shaper 2, an auto-oscillator modulator 3, and a television receiver

(TP) 4, as well as the scaling unit 5 and the sequentially connected shaper mark shaper 6, counting pulse shaper 7 and indicator 8. Reducing the measurement error of the time and amplitude parameters of ECG signals is provided by using shaper 6, which forms moving sight marks for selecting a section measurement of the ECG signal of the block 5, with which you can smoothly zoom the image on the screen of the TP 4 horizontally and vertically, and automatically digitally read the measurement results Using the imaging unit 7 counting pulses and a digital indicator 8, which eliminates the influence of the nonlinearity of TP 4 sweeps on the measurement accuracy of the parameters of ECG signals. 1 il.

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About 00

The invention relates to medical technology, namely to devices for observing and measuring the amplitude and time parameters of electrocardiogram signals on a television receiver screen.

The purpose of the invention is to reduce the measurement error of the parameters of the electrocardiogram signals.

The drawing shows a block diagram of the device.

A device for measuring parameters of electrocardiogram signals (ECG) contains serially connected master oscillator I, driver 2 tele10

is through the clock operation of the entire device through block 5 and shaper 2. When measuring the parameters of the ECG signal from the shaper 2, the first input shaper of the sighting marks receives a horizontal quenching pulse (SGI) and the single vibrator 9 produces a pulse triggering the back front one-vibrator 10 The latter produces an impulse that forms, with the leading edge, the first target mark on the television sweep line, and the posterior one, the second mark. The distance between them corresponds to the pulse duration and the duration of the measured portion of the ECG. With the help of an ECG regulating signal, a modulator of auto-heating, provided in the one-shot 9,

the location of the first (initial) label is established, and the adjustment in the one-shot 10 - the location of the second (reference) label.

At the second input of the imaging unit 6, a post-generator 3 and a television receiver 4 (television 4), as well as a scaling unit 5, the first input of which is connected to the second output of the master oscillator 1,

and the output and the second input are connected to the second input and the second one, respectively, of the damping field impulse (GUI) and one of the former 2 of the television signal-vibrator 11 produces an impulse,

ECG, to the third and fourth outputs of which the first and second inputs are connected respectively

On its front, the starting point of the measuring vertical line is formed on the screen of the TV 4 and the enabled imaging unit 6 target plates 25 one-shot 12. The last output, the imaging unit 7 counting pulses and the indicator 8, while the second output of the imaging unit 6 viewing marks is connected to the second modulator input -auto-generator, and the second input of the imaging unit 7 of the counting pulses is connected to the second output of the scaling unit.

The ECG TV signal shaper 2 is built according to the well-known scheme of standard blocks: bioamplifier - analog-digital converter - random access memory - digital-analog converter - television signal shaper with a common control unit and a synchronous generator

The pulse duration is adjusted manually and corresponds to the length of the vertical line displayed on the TV screen 4. The adjustment in the one-shot 11 determines the vertical position of the starting point of reference, and the control in the one-shot 12 determines the length of the vertical line on the TV - 4. Thus, the location and size of the vertical line vertically is performed using

35 adjustments in one-shot 11 and 12, and the horizontal position - using adjustments in one-shot 9 and 10. Signals from one-shot 10 and 12 through

13

circuit 13 matches arrive at the second

The shaper of the six markers of the state is the input of the modulator-oscillator 3 for mixing into the ECG video signal.

When measuring the duration of the ECG measurement area, the first label is installed (combined) with the beginning of the measurement area, and the second sight mark with its end.

IT from 9-12 one-shot and matching schemes.

Shaper 7 counting pulses consists of a pulse generator 14, a coincidence circuit 15 and common to shapers 6 and 7 of the switch SB1.

The indicator 8 consists of a counter 16, a decoder 17 and a digital indicator 18.

The device works as follows.

ECG signals are fed to the input of the imaging unit 2, which converts them into a television signal of the ECG image for display on the screen of the television receiver 4 via the modulator-autogenerator 3. Simultaneously, the second, third and fourth outputs of the imaging unit 2 receive horizontal lowering pulses and damping field pulses. which are used for the operation of the scaling unit 5 and the imaging unit 6 target marks. Master oscillator 1

55

To measure the duration, the switch SB1 is set to position I. The coincidence circuit 15 receives a pulse from the imaging unit 6, equal to the duration of the measurement section, and pulses from the scaling unit 5 with a frequency equal to the reading frequency of the digital code of the ECG signal of the imaging signal 2. As a result, the output of the circuit 15 a coincidence appears a burst of pulses whose number is equal to the duration of the measured interval of the ECG area.

When measuring the amplitude of the ECG elements, the switch is switched to position II

0

is through the clock operation of the entire device through block 5 and shaper 2. When measuring the parameters of the ECG signal from the shaper 2, the first input shaper of the sighting marks receives a horizontal quenching pulse (SGI) and the single vibrator 9 produces a pulse triggering the back front one-vibrator 10 The latter produces an impulse that forms, with the leading edge, the first target mark on the television sweep line, and the posterior one, the second mark. The distance between them corresponds to the pulse duration and the duration of the measured portion of the ECG. With the help of the adjustment provided for in the one-shot 9,

The front of which forms the starting point of the measuring vertical line on the screen of the TV 4 and starts the one-shot 12. The last one turns out the one-shot 12. The last produces a pulse, the duration of which is manually adjustable and corresponds to the length of the vertical line displayed on the screen of the TV 4. Adjustment having in the one-shot 11, determines the vertical position of the starting point of reference, and the adjustment in the one-oscillator 12 determines the length of the vertical line on the TV screen - 4. Thus The vertical position and size of the vertical line is accomplished using

adjustments in one-shot 11 and 12, and the horizontal position - using adjustments in one-shot 9 and 10. Signals from one-shot 10 and 12 through

circuit 13 matches arrive at the second

0

To measure the duration, the switch SB1 is set to position I. The coincidence circuit 15 receives a pulse from the imaging unit 6, equal to the duration of the measurement section, and pulses from the scaling unit 5 with a frequency equal to the reading frequency of the digital code of the ECG signal of the imaging signal 2. As a result, the output of the circuit 15 a coincidence appears a burst of pulses whose number is equal to the duration of the measured interval of the ECG area.

When measuring the amplitude of the ECG elements, the switch is switched to position II

and combines the size and position of the vertical line with the measured ECG section. In this case, a pulse from the imaging unit 6 arrives at one input of the coincidence circuit 15, and a pulse sequence from the generator 14 arrives at the second input. As a result, the output of the circuit 15 produces a burst of pulses corresponding to the amplitude of the section being measured.

Pulse sequences from circuit 7 enter indicator circuit 8. Counter 16 counts the number of pulses in a pulse sequence packet in binary code, decoder 17 converts binary code to seven-fold, and then digital (18 in decimal code) value of measured duration is displayed on digital indicator 18 or amplitudes, respectively, in milliseconds or millivolts.

To reduce the counting error due to the commensurability of the linear dimensions of individual sections, the ECG with the thickness of the target marks, the device provides for changing (increasing) the size of the image using the scaling unit 5.

When measuring durations, the scale of the image on the TV screen can be smoothly changed horizontally 10 times (manually). To do this, block 5 provides for simultaneous adjustment of the reading frequency of the digital code of the ECG signal in the shaper 2 and the frequency entering the shaper 7. This provides for automatic tuning of the duration measurement range.

When measuring the amplitude, you can smoothly zoom on the screen 10 times vertically on the screen. The amplitude adjustment of the ECG, provided in the imaging unit 2, is combined with the adjustment of the frequency of the generator 14 of the imaging device 7, which ensures the measurement of the amplitudes without recalibration of the measuring device as the scale changes.

Thus, the image provides high accuracy of measurement of the time and amplitude parameters of ECG signals by automatically counting in the digital decimal code of the measured parameters, eliminating errors due to nonlinearity of the ECG image on the TV screen, and reducing the counting error due to the change (increase) scale image of the ECG signal.

15

Claims (1)

Invention Formula A device for measuring the parameters of an electrocardiogram signal, containing a series-connected master oscillator, an electrocardiogram television signal generator, an auto-oscillator modulator and a television receiver, as well as a scaling unit, the first input of which is connected to the second output of the master oscillator, and the output and the second input connected respectively to the second input and the second output of the television signal generator of the electrocardiogram, characterized in that, in order to reduce the measurement error, sequentially connected sight marker, the counting pulse generator and the indicator are inserted into it, while the third and fourth outputs of the television signal generator of the electrocardiogram are connected respectively to the first and second shaper inputs labels, the second output of which is connected to the second input of the modulator-oscillator, and the second input of the counting pulse generator is connected to the second output of the scaling unit.