SU1253624A1 - Electrocardiosignal simulator - Google Patents

Description

The invention relates to medical technology, namely to electrocardiographic devices.

The purpose of the invention is to expand the functional capabilities by imitating atrial fibrillation, due to the possibility of arbitrary modeling of the time and amplitude parameters generated by the electrocardiogram by a given program.

FIG. 1 shows the structural scheme of an electrocardiogram simulator; pas figs. 2 - timing diagrams that show simulator operation.

The electrocardiogram simulator contains a pulse generator 1, a frequency divider 2, a pulse counter 3 connected to the first input of the electrocardiogram formation unit 4, made in the form of serially connected memory block 5 and a code-voltage converter 6, control block 7, switch 8 and generator 9 random numbers. The output of the latter is connected to the input of the parallel recording of information of the counter of 3 pulses, and the input to the first output of the control unit 7 and the synchronization input of the recording of the counter 3 and 5

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Each phase of the formation corresponds to the state of the additional counter 10. The next cycle of the simulator begins with the formation phase of the random component of the pause after the additional counter 10 goes to the zero state and the output of the pulse generator 11 is written. the output of the random number generator is 9, and the random number generator 9 is turned on to form a new random number. In the zero state, the additional counter 10 is allowed to pass through the switch 8 to the second input of the control by the conversion factor of divider 2 of the frequency code Ki from the first input of switch 8. Suppose that the counter is 3 pulses of reversing type. In this case, for each pulse from the output 2 of the frequency divider, the state of the counter of 3 pulses is successively reduced to zero, after which the next pulse converts the counter 3 from the zero state to the maximum state and overflow signal is generated at the first output, according to which the additional counter 10 increases on

pulses. The counting input of the counter 3 pulses is 25 units, the formation phase begins

ow is connected to the output of frequency divider 2, the first input of which is connected to the output of the pulse generator 1, and the second input to the output of switch 8. The first and second inputs of switch 8 are connected respectively to the second and third outputs of control unit 7, the input of which is connected to the output of the counter 3 pulses, and the second output - with the second input of the electrocardiogram unit 4. The address input of the memory unit 5 is the primary component of the pause.

The unit code from the output of the additional counter 10 through the switch 8 allows the passage of the code K2 from its second input. Pulses from the output of the divider 30 tel 2 frequencies following the frequency determined by the K2 code, the state of the counter 3 successively decreases from maximum to zero, after which the output of the counter 3 produces an overflow pulse, according to which the state is additionally inputted by the formation unit 4 meter 10 is increased by one

the cardio signal, the control input of the converter 6, the code voltage is the second input of the electrocardiogram generation unit 4.

The control unit 7 comprises successively connected an additional pulse counter 10 and the driver 11 of the control pulses, the input of which is the second output of the control unit 7, and the output the first output of the control unit 7. The second output of the additional counter 45 pulses 10 is the third output of the control unit 7.

The device works as follows.

The simulator generates a sequence of cardiocycles, including their simulated PQRST complexes and the pauses between them (Fig. 2). The pause consists of two components, constant (0 to sec) and random (conducted), the value of which varies from cycle to cycle. A simulated cardiocycle consists of three phases: the formation of a random component of the pause (led), the formation of a constant component of the pause (CPV), the formation of a simulated PQRST signal.

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counter 3 goes to the maximum state and the phase of formation of the PQRST complex begins.

When the code is two, the output and the additional counter 10 are allowed to pass through the switch 8 of the code Kz from its third input, and the unit from the output of the second discharge of the counter allows the code-voltage converter 6 to work. By pulses from the output of divider 2, the frequencies that follow with the frequency determined by Cs, the state of counter 3 is successively reduced from maximum to zero, and from the memory block 5, by address determined by the states of counter 3, the sequence of codes is read. which, at the output of the code-voltage converter 6, forms the PQRST complex. After the transition of the counter 3 through the zero state on the overflow pulse from its first output, the additional counter 10 (with the conversion factor 3) goes to the zero state. The cycle of the device is over.

In the transition at the output of the second discharge of the additional counter 10 signal from

Each phase of the formation corresponds to the state of the additional counter 10. The next cycle of the simulator begins with the formation phase of the random component of the pause after the additional counter 10 goes to the zero state and the output of the pulse generator 11 is written. the output of the random number generator is 9, and the random number generator 9 is turned on to form a new random number. In the zero state, the additional counter 10 is allowed to pass through the switch 8 to the second input of the control by the conversion factor of divider 2 of the frequency code Ki from the first input of switch 8. Suppose that the counter is 3 pulses of reversing type. In this case, for each pulse from the output 2 of the frequency divider, the state of the counter of 3 pulses is successively reduced to zero, after which the next pulse converts the counter 3 from the zero state to the maximum state and overflow signal is generated at the first output, according to which the additional counter 10 increases on

constant component pause.

The unit code from the output of the additional counter 10 through the switch 8 allows the passage of the code K2 from its second input. Pulses from the output of the dividers 2 frequencies, which follow with the frequency determined by code K2, the state of counter 3 successively decelerate from maximum to zero, after which the output of counter 3 produces an overflow pulse, according to which the state of additional counter 10 increases by one

counter 3 goes to the maximum state and the phase of formation of the PQRST complex begins.

When the code is two, the output and the additional counter 10 are allowed to pass through the switch 8 of the code Kz from its third input, and the unit from the output of the second discharge of the counter allows the code-voltage converter 6 to work. By pulses from the output of divider 2, the frequencies that follow with the frequency determined by Cs, the state of counter 3 is successively reduced from maximum to zero, and from the memory block 5, by address determined by the states of counter 3, the sequence of codes is read. which, at the output of the code-voltage converter 6, forms the PQRST complex. After the transition of the counter 3 through the zero state on the overflow pulse from its first output, the additional counter 10 (with the conversion factor 3) goes to the zero state. The cycle of the device is over.

In the transition at the output of the second discharge of the additional counter 10 signal from

units to zero, shaper 11 generates a pulse, according to which a new random number is written to counter 3, and random number generator 9 is turned on to form the next code. A new cycle of operation of the device begins.

The sequence of the cycles described is periodically repeated and a sequence of cardiocycles is formed at the output of the device. The duration (t) of the signal of the simulated PQRST complex is equal to

t Ggek-L: s-2,

where Tpi is the period of the following pulses of the pulse generator 1; Кз - control code for the duration of the complex PQRST, applied to the third input of the switch 8; t is the counter width of 3 pulses. The duration of the constant component of the pause between adjacent PQRST complexes is determined by the ratio

wsgen 2,

where is the control code of the pause duration applied to the second input of the switch 8. The duration of the random component

pause formed on the / -th cycle is

led, f gene - / (i -Ai,

where K.i is the control code for the duration of the sampling intervals of the random component supplied to the first input of the switch 8;

./ / 4, - random numbers written on

i-th cycles in the counter 3 pulses.

five

five

0

The mathematical expectation of the period followed by simulated cardiocycles is determined by the ratio m + v. + 0с.1, - t 4- в „, +

+ Gene - / (, L,

where - A symbol of mathematical expectation.

The average number of simulated heart rate intervals per minute is.

Thus, the parameters of the simulated heart process are controlled by the values of the codes Ki, K2, Kz. The law of distribution of the random component of the pause is determined by the law of distribution of random numbers generated by the generator, the shape of the imitation signal of the PQRST complex is determined by the sequence of codes recorded in memory block 5.

Thus, the simulator provides the ability to automatically. Simulate an EKS in the form of a sequence of PQRST complexes of the required form, following with specified time intervals.

The simulator allows generating any arrhythmias and provides the possibility of arbitrary simulation of temporal and amplitude parameters of electrocardiograms according to a specified program. The cardiac signal simulator significantly increases the accuracy of monitoring the operation of instruments for measuring, recording and analyzing cardiac arrhythmias and expands the range of simulated arrhythmias.

i / g 2

Claims (3)

1. ELECTROCAR- SIMULATOR A DIAGNOSIS containing a pulse generator, a pulse counter connected to the first input of the cardio-signal generating unit, a control unit and a switch, characterized in that, in order to expand functionality by simulating atrial fibrillation, a frequency divider and a random number generator are inserted into it, the output of which is connected with the input of the parallel recording of the pulse counter information, and the input with the first output of the control unit and the synchronization input of the pulse counter record, the counting input of which is connected a frequency divider output, a first input of which cos FIG. is dined with the output of the pulse generator, and the second input is with the output of the switch, the first and second inputs of which are connected respectively to the second and third outputs of the control unit, the input of which is connected to the output of the pulse counter, and the second output is connected to the second input of the cardio-signal generating unit. 2. The simulator by π. 1, characterized in that the forming unit electrocardiosignal configured as a series-connected storage unit and code-voltage converter, and the address input of the storage unit is a first input electrocardiosignal forming unit, the control input of the code converter _Λ-on voltage was a second input unit § formation electrocardiosignal . 3. The simulator by π. 1, characterized in that the control unit contains a series-connected additional pulse counter and a pulse shaper control, the input of which is the second output of the control unit, and the output is the first output of the control unit, the second output of the additional pulse counter is the third output of the control unit. SU, „, 1253624