RU2008796C1 - Device for recording electrocardiosignals - Google Patents

Abstract

FIELD: medical equipment. SUBSTANCE: device has amplifier 1, analog-to-digital converter 2 provided with multiplexer and arithmetic unit 3, connected in series. Device also has memory unit, digital data selector 6, increments code analyzers, increment code number counter 7, switching unit 5 and control unit 8. EFFECT: reduced time for transmitting information along phone communication channels. 1 dwg

Description

 The invention relates to medicine, can be used to transmit electrocardiosignals (EX) to a distance via communication channels and is intended to transmit EX by telephone during a mass examination of the population.

 A device for transmitting electrocardiograms is known, comprising a series-connected amplifier, a multiplexer with an analog-to-digital converter, an arithmetic device, a buffer memory, and a digital modem.

 The principle of operation of the device is that the calculated EX increment codes are sent to the transmission line, and only if the increment code is greater than a certain threshold, otherwise transmission will not be carried out.

 The disadvantage of this device is the loss of accuracy in measuring the signal during transmission due to the discarding of the least significant bits of the increment code in accordance with the set threshold, which leads to distortions of the R and T waves of the electrocardiogram, the shape of which is important for modern cardiac diagnostics.

 The discarding of the least significant bits of the increment code, which leads to a loss of accuracy, is caused by the desire to eliminate the main contradiction in digital transmission, which consists in the fact that the speed at which the information arrives at the input of the device is greater than the possible speed of its transmission over the communication channel.

 It is known that a device for transmitting ECS is selected as a prototype, it contains a serially connected amplifier, a multiplexer with an analog-to-digital converter, an arithmetic device, a buffer memory, a digital modem that implements a transmission method with storing incoming information and transmitting it offline at a speed corresponding to channel characteristics communication. The disadvantages of the known device include the fact that it takes a long time to occupy the channel and a large buffer memory of the device due to the need to memorize at the transmitting end and the subsequent transmission of a large amount of information.

 The purpose of the invention is to reduce the transmission time of diagnostic information via telephone communication channels.

 The device for transmitting electrocardiosignals contains a three-channel amplifier 1 of electrocardiosignals in series, an analog-to-digital converter with a multiplexer 2, an arithmetic device 3, an increment code analyzer 4, a switching unit 5, modem 6. In addition, the device contains a number counter, an increment code 7, control inputs which is connected to the corresponding outputs of the control unit 8 and the analyzer of increment codes 4, and the output to the input (2) of the memory unit 9, the second input (1) of which is connected to the output (2) of the first bits of the control unit are connected respectively to the control inputs of the analog-to-digital converter 2 and the output of the memory unit 9 to the second input of the switching unit 5, the first input of which is connected to the output of the least significant and significant bits of the analyzer 4. switching unit 5.

 The listed blocks with their connections exhibit new properties that can reduce the busy time of the communication channel and the amount of buffer memory by reducing the amount of stored and transmitted information.

 The device operates as follows. The clock pulses from the output 3 of the control unit 8 are fed to the input (2) of the unit 2 and start the ADC and the multiplexer, so that at the output of the ADC and, accordingly, at the input of the arithmetic device, the amplitude codes of the ECS appear sequentially in each lead. The arithmetic device forms for each lead the difference of the current and previous time samples, thus the 8th digit signal increment code with a sign (9th digit) is sequentially for each lead to the input of the increment code analyzer. Simultaneously with the output (1) of the control unit 8, clock pulses of the same frequency of 1500 Hz (500 x 3 channels) are fed to the counting input 2 of the counter of the increment code number 7, as a result of which the number of the calculated signal increment is generated at the output of counter 7, i.e. . its time coordinate.

 In the analyzer of increment codes 4, the incoming increment code is divided into two parts; the two least significant bits of the increment code and its sign digit (a total of 3 bits) through the input (1) of the switching unit 5 are sent directly to the digital modem and then to the communication channel and transmitted to the receiving end. The values of the remaining six most significant bits of the increment code are analyzed and, if at least one bit differs from zero through the input (2) of the increment code analyzer block, these 6 bits go to the input (1) of memory block 9, where they are stored. At the same time, when the condition for non-zero is fulfilled, the increment code analyzer block 4 generates a time coordinate recording command coming from the analyzer to the input (1) of the increment code number counter 7, where the number of the current increment code (time coordinate) is determined.

 If all 6 high-order bits of the incoming increment code are equal to zero, then the two least significant bits and the familiar bit of the increment code, as before, enter the line for transmission, and the increment code analyzer waits for the next increment code to arrive.

 The described procedure occurs until the specified time of registration of the ECS ends, which is determined by the length of the time interval worked out by the control unit. At the end of the interval, the control unit 8 stops supplying clock pulses to outputs 1 and 3, stopping the operation of blocks 2, 3, 4, 7, and through the outputs (2) sends a command to the input (3) of the switching unit 5, connecting the modem input to the output of the unit memory 9 through the input (2) of the switching unit 5 and starting the transfer of the contents of the memory, i.e., the stored high-order bits of the increment codes and their time coordinates.

 While maintaining the initial accuracy of the signal measurement, the device provides a significant (almost 3 times) decrease in the required buffer memory and 1.5 times a decrease in channel busy time, which leads to the possibility of transmitting a larger (1.5 times) amount of diagnostic information for one and the same time and to reduce the cost of the device and its operation. (56) Microcomputer medical systems / Ed. W. Tompkins, M.: Mir, 1983, p. 342.

Claims (1)

 DEVICE FOR REGISTRATION OF ELECTROCARDO SIGNALS, comprising an amplifier, an analog-to-digital converter with a multiplexer and an arithmetic device connected in series, as well as a memory unit and a digital modem, characterized in that, in order to reduce the time for transmitting diagnostic information via telephone communication channels, an analyzer is introduced into it increment codes, increment code number counter, switching unit and control unit, wherein the input of the increment code analyzer is connected to the output of an arithmetic device, p The first output of the increment code analyzer is connected to the first input of the switching unit, the second to the first input of the memory unit, and the control output to the first input of the increment code number counter, the second input of which is connected to the first output of the control unit, the second and third outputs of the last are connected respectively to the control input of the switching unit, and the second input of the analog-to-digital converter, while the output of the increment code number counter is connected to the second input of the memory unit, the output of which is connected to the second input of the unit ka switching, and the output of the switching block with the input of the modem.