Electrocardio electrode tester and control method thereof

Abstract

The application discloses an electrocardio electrode tester and a control method thereof, and belongs to the technical field of electrocardio electrode testers.The electrocardio electrode tester comprises a transformer, a power board circuit, a logic control board, a DC 200V output circuit, a distribution circuit, a function switch conversion circuit and a touch display screen, wherein the power board circuit is connected with the transformer, the logic control board, the DC 200V output circuit, the distribution circuit and the touch display screen respectively, the logic control board is connected with the DC 200V output circuit, the distribution circuit, the function switch conversion circuit and the touch display screen respectively, and the function switch conversion circuit is connected with the DC 200V output circuit and the distribution circuit respectively.The electrocardio electrode tester provided by the application has high measurement precision and sensitive reaction, and a traceable calibration interface is designed to ensure the accuracy of output.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an electrocardiogram electrode tester and its control method. Background Technology

[0002] Existing ECG electrode testing devices have low measurement accuracy and cannot respond to many subtle signals in real time, resulting in delayed measurement results. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an electrocardiogram (ECG) electrode testing device, comprising: a transformer, a power supply board circuit, a logic control board, a DC200V output circuit, a sub-circuit, a function switch conversion circuit, and a touch screen display. The power supply board circuit is connected to the transformer, the logic control board, the DC200V output circuit, the sub-circuit, and the touch screen display. The logic control board is connected to the DC200V output circuit, the sub-circuit, the function switch conversion circuit, and the touch screen display. The function switch conversion circuit is connected to the DC200V output circuit and the sub-circuit.

[0004] Preferably, the sub-circuit includes: an analog control board, an AC200uA circuit, a DC250nA circuit, and a voltage measurement circuit, wherein the analog control board is connected to the logic control board, the AC200uA circuit, the DC250nA circuit, and the voltage measurement circuit, respectively, and the function switch conversion circuit is connected to the AC200uA circuit, the DC250nA circuit, and the voltage measurement circuit, respectively.

[0005] Preferably, the power board circuit includes: a rectifier circuit, a filter circuit, a voltage regulator circuit, a high-voltage power supply circuit, an analog power supply circuit, and a logic power supply circuit, wherein the filter circuit is connected to the rectifier circuit, the voltage regulator circuit, and the high-voltage power supply circuit, and the voltage regulator circuit is connected to the analog power supply circuit and the logic power supply circuit.

[0006] Preferably, the logic control board includes a 5V to 3.3V circuit and a logic control MCU, wherein the logic control MCU is connected to the 5V to 3.3V circuit and the touch screen respectively.

[0007] Preferably, the DC200V output circuit includes an isolation power supply circuit and a secondary circuit, wherein the isolation power supply circuit and the secondary circuit are connected, and the secondary circuit is connected to the function switch conversion circuit.

[0008] Preferably, the secondary circuit includes: a DAC conversion circuit, an optocoupler isolation circuit, a DC 220V output circuit, a defibrillation voltage measurement circuit, and a defibrillation power supply, wherein the DAC conversion circuit is connected to the optocoupler isolation circuit and the DC 220V output circuit respectively, the defibrillation voltage measurement circuit is connected to the optocoupler isolation circuit and the defibrillation power supply respectively, and the DC 220V output circuit is connected to the function switch conversion circuit.

[0009] Preferably, the analog control board includes a 5V to 3.3V converter circuit and an analog control MCU, wherein the 5V to 3.3V converter circuit and the analog control MCU are connected.

[0010] Preferably, the AC200uA circuit includes: a waveform generator, a high-pass filter, a programmable potentiometer, and a current source output circuit, wherein the high-pass filter is connected to the waveform generator and the programmable potentiometer, the programmable potentiometer is connected to the waveform generator and the current source output circuit, and the current source output circuit is connected to the function switch conversion circuit.

[0011] Preferably, the DC250nA circuit includes: a reference voltage generating circuit, a D / A conversion circuit, and a DC250nA current source output circuit, wherein the D / A conversion circuit is connected to the reference voltage generating circuit and the DC250nA current source output circuit, and the DC250nA current source output circuit is connected to the function switch conversion circuit.

[0012] Preferably, the voltage measurement circuit includes: an instrumentation amplifier, a gain-adjustable amplifier circuit, a low-pass filter, and an A / D converter, wherein the instrumentation amplifier is connected to the function switch conversion circuit and the gain-adjustable amplifier circuit respectively, and the low-pass filter is connected to the gain-adjustable amplifier circuit and the A / D converter respectively.

[0013] This application also provides a control method for an electrocardiogram electrode testing device, the method comprising the following steps:

[0014] Receive external instructions;

[0015] The touch screen sends control commands to the logic control board according to the external instructions;

[0016] The logic control board parses the control instructions and obtains the control values;

[0017] Determine the relationship between the control value and the detection value;

[0018] Based on the judgment result, the logic control board sends a preset instruction to the scoring circuit.

[0019] This application provides an electrocardiogram electrode tester with high measurement accuracy and sensitive response, and it is designed with a traceability calibration interface to ensure the accuracy of the output. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an electrocardiogram electrode testing device provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the power board circuit in an electrocardiogram electrode tester provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the logic control board in an electrocardiogram electrode tester provided by the present invention;

[0024] Figure 4 This is a schematic diagram of the DC200V output circuit in an electrocardiogram electrode tester provided by the present invention;

[0025] Figure 5 This is a schematic diagram of the analog control board in an electrocardiogram electrode testing device provided by the present invention;

[0026] Figure 6 This is a schematic diagram of the AC200uA circuit in an electrocardiogram electrode tester provided by the present invention;

[0027] Figure 7 This is a schematic diagram of the DC250nA circuit in an electrocardiogram electrode tester provided by the present invention;

[0028] Figure 8 This is a schematic diagram of the voltage measurement circuit in an electrocardiogram electrode tester provided by the present invention;

[0029] Figure 9 This is a schematic diagram of the high-voltage power supply circuit in an electrocardiogram electrode tester provided by the present invention;

[0030] Figure 10 This is a schematic diagram of the analog power supply circuit in an electrocardiogram electrode tester provided by the present invention;

[0031] Figure 11 This is a schematic diagram of the logic power supply circuit in an electrocardiogram electrode tester provided by the present invention;

[0032] Figure 12This is a schematic diagram of a 5V to 3.3V circuit in an electrocardiogram electrode tester provided by the present invention;

[0033] Figure 13 This is a schematic diagram of the logic control MCU in an electrocardiogram electrode tester provided by the present invention;

[0034] Figure 14 This is a schematic diagram of the isolated power supply circuit in an electrocardiogram electrode tester provided by the present invention;

[0035] Figure 15 This is a schematic diagram of the optocoupler isolation circuit in an electrocardiogram electrode tester provided by the present invention;

[0036] Figure 16 This is a schematic diagram of the DAC conversion circuit in an electrocardiogram electrode tester provided by the present invention;

[0037] Figure 17 This is a schematic diagram of the DC 220V output circuit in an electrocardiogram electrode tester provided by the present invention;

[0038] Figure 18 This is a schematic diagram of a defibrillation voltage measurement circuit in an electrocardiogram electrode testing device provided by the present invention;

[0039] Figure 19 This is a schematic diagram of the analog power supply circuit in an electrocardiogram electrode tester provided by the present invention;

[0040] Figure 20 This is a schematic diagram of the analog control MCU in an electrocardiogram electrode tester provided by the present invention;

[0041] Figure 21 This is a schematic diagram of the waveform generator in an electrocardiogram electrode tester provided by the present invention;

[0042] Figure 22 This is a schematic diagram of the current source output circuit in an electrocardiogram electrode tester provided by the present invention;

[0043] Figure 23 This is a schematic diagram of the reference voltage generating circuit in an electrocardiogram electrode tester provided by the present invention;

[0044] Figure 24 This is a schematic diagram of the DC250nA current source output circuit in an electrocardiogram electrode tester provided by the present invention;

[0045] Figure 25 This is a schematic diagram of an adjustable gain amplifier circuit in an electrocardiogram electrode tester provided by the present invention;

[0046] Figure 26 This is a schematic diagram of a low-pass filter in an electrocardiogram electrode tester provided by the present invention;

[0047] Figure 27 This is a schematic diagram of an A / D converter in an electrocardiogram electrode tester provided by the present invention;

[0048] Figure 28 This is a schematic diagram of a function switch conversion circuit in an electrocardiogram electrode tester provided by the present invention;

[0049] Figure 29 This is a schematic diagram of the relay drive circuit in an electrocardiogram electrode tester provided by the present invention;

[0050] Figure 30 This is a schematic diagram of the function switching circuit in an electrocardiogram electrode tester provided by the present invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0052] like Figure 1-30 In this embodiment of the application, the present invention provides an electrocardiogram electrode tester, comprising: a transformer, a power board circuit, a logic control board, a DC200V output circuit, a sub-circuit, a function switch conversion circuit, and a touch screen display. The power board circuit is connected to the transformer, the logic control board, the DC200V output circuit, the sub-circuit, and the touch screen display. The logic control board is connected to the DC200V output circuit, the sub-circuit, the function switch conversion circuit, and the touch screen display. The function switch conversion circuit is connected to the DC200V output circuit and the sub-circuit.

[0053] like Figure 1-30 In this embodiment of the application, the sub-circuit includes: an analog control board, an AC200uA circuit, a DC250nA circuit, and a voltage measurement circuit. The analog control board is connected to the logic control board, the AC200uA circuit, the DC250nA circuit, and the voltage measurement circuit, respectively. The function switch conversion circuit is connected to the AC200uA circuit, the DC250nA circuit, and the voltage measurement circuit, respectively.

[0054] like Figure 1-30In this embodiment of the application, the power board circuit includes: a rectifier circuit, a filter circuit, a voltage regulator circuit, a high-voltage power supply circuit, an analog power supply circuit, and a logic power supply circuit. The filter circuit is connected to the rectifier circuit, the voltage regulator circuit, and the high-voltage power supply circuit, respectively. The voltage regulator circuit is connected to the analog power supply circuit and the logic power supply circuit, respectively.

[0055] In this embodiment, the power board circuit provides power to the entire system, and generates DC power of different amplitudes by passing the voltage output from the transformer through a rectifier circuit, a filter circuit, and a voltage regulator circuit.

[0056] In this embodiment of the application, the function of the high-voltage power supply circuit is: the AC160V power output from the transformer is rectified and filtered by the bridge and the filter capacitor to output DC240V. This DC power supply is used to generate a precise DC200V power supply for defibrillation overload recovery tests.

[0057] In this embodiment, the analog power supply circuit functions as follows: the two AC 10V power supplies output from the transformer are rectified by a bridge, a filter capacitor, and a voltage regulator chip, and then output as 9V, 5V, and -5V DC power supplies. These DC voltages are used in the analog measurement and control section of the system.

[0058] In this embodiment, the function of the logic power supply circuit is to output a DC 5V voltage after the AC 7V voltage output by the transformer is rectified by the rectifier bridge, filter capacitor and voltage regulator chip. This DC power supply is used in the logic circuit part of the system.

[0059] like Figure 1-30 In this embodiment of the application, the logic control board includes a 5V to 3.3V circuit and a logic control MCU, wherein the logic control MCU is connected to the 5V to 3.3V circuit and the touch screen respectively.

[0060] In this embodiment, the logic control board includes an MCU for logic control, a power supply for its normal operation, and a minimum system circuit, which mainly controls and processes the logic section.

[0061] In this embodiment, the 5V to 3.3V circuit converts the 5V voltage to 3.3V using the AMS1117 power chip to power the digital part of the entire system. The 5V power is supplied from the power board.

[0062] In this embodiment, the logic control MCU functions as follows: the logic control MCU chip STM32F411 and the peripheral circuits provided for its normal operation, including two crystal oscillators, a program download interface, and a battery power supply circuit for the RTC to operate in the event of a power outage.

[0063] like Figure 1-30 In this embodiment of the application, the DC200V output circuit includes: an isolation power supply circuit and a secondary circuit, wherein the isolation power supply circuit and the secondary circuit are connected, and the secondary circuit is connected to the function switch conversion circuit.

[0064] In this embodiment, the DC200V output circuit is mainly used to generate the DC 200V defibrillation power supply required for the defibrillation overload recovery experiment, and also to measure the output defibrillation voltage value.

[0065] In this embodiment, the function of the isolation power supply circuit is to generate a 5V voltage based on HVGND through a DC-DC isolation power supply chip, which is used to isolate the connection with other low-voltage circuits, ensure the safety of the system, and supply power to the chips in this part of the circuit.

[0066] like Figure 1-30 In this embodiment of the application, the secondary circuit includes: a DAC conversion circuit, an optocoupler isolation circuit, a DC 220V output circuit, a defibrillation voltage measurement circuit, and a defibrillation power supply. The DAC conversion circuit is connected to the optocoupler isolation circuit and the DC 220V output circuit, the defibrillation voltage measurement circuit is connected to the optocoupler isolation circuit and the defibrillation power supply, and the DC 220V output circuit is connected to the function switch conversion circuit.

[0067] In this embodiment, the optocoupler isolation circuit is used for digital transmission between this part of the circuit and the logic control MCU. Since the DC-DC isolated power supply has separated the reference ground of this part from the reference ground of other parts, signal transmission needs to pass through the isolation circuit. Signal transmission uses positive logic. When the logic level of input pin 3 is high, the LED inside the optocoupler chip is not turned on, the phototransistor does not sense light and is not turned on, the AND gate output is low, and the output transistor is not turned on. Output pin 5 is pulled high by a 510R resistor.

[0068] In this embodiment, the DAC conversion circuit functions to generate an analog signal of varying value based on the externally input digital signal. This analog signal is used to control the magnitude of the output defibrillation voltage. The operational amplifier forms a non-inverting operational amplifier circuit, with the non-inverting input being a voltage generated by a Zener diode. The operational amplifier's output voltage provides a reference power supply voltage for the DAC conversion chip.

[0069] In this embodiment, the DC 200V output circuit is used to generate the DC 200V defibrillation voltage required for the defibrillation overload recovery experiment. The HV240V voltage is divided by resistors R506, R505, and R504 to generate a voltage at the non-inverting input of operational amplifier U503. It also charges capacitor C511 through resistors R509, R511, and R510 to generate a voltage at the inverting input of operational amplifier U503. The voltage at the non-inverting input rises faster than the voltage at the inverting input, causing the operational amplifier output to shift towards the positive power supply direction. Through resistor R512, operational amplifier U503 forms negative feedback, at which point the output of operational amplifier U503 is zero. When a positive voltage is applied to the positive terminal of op-amp U510, its output shifts towards the positive power supply. When this voltage reaches the transistor's Ube threshold voltage, current flows through the transistor's collector, creating a voltage drop across resistor R509. This increases the output of op-amp U503 and decreases the output of op-amp U510, forming negative feedback. The voltage difference across resistor R509 then stabilizes at a fixed value. Therefore, by adjusting the voltage at the positive input terminal of op-amp U510, the magnitude of the DC output voltage across resistor R509 can be controlled. The relationship between the voltage at the positive terminal of op-amp U510 and its output voltage is as follows:

[0070] U+_510=(U_DC200V+-U_DC200V-)*[R512 / (R510+R511)]

[0071] The positive input voltage of the U510 op-amp can be selected using the shorting caps SB500 and SB501. SB500 is connected to the output voltage of the DAC conversion circuit. SB501 is connected to a manually adjustable potentiometer. When SB500 is connected, the 200V DC output voltage can be controlled by an external digital input signal.

[0072] In this embodiment, the defibrillation voltage measurement circuit is used to measure the output defibrillation voltage and mainly consists of a differential amplifier circuit and an ADC conversion circuit. Vm_300V+ and Vm_300V- are the output defibrillation voltages, which are applied to the input terminal of the operational amplifier after being divided by resistors. The relationship between the operational amplifier's output voltage and the defibrillation voltage is as follows:

[0073] Vo=(Vm_300V+-Vm_300V-)*[R522 / (R519+R520)]

[0074] The op-amp output voltage is applied to the IN+ pin of the ADC conversion chip, and after being converted into a digital signal by the ADC, it is transmitted to the logic control MCU through an optocoupler.

[0075] like Figure 1-30 In this embodiment of the application, the analog control board includes a 5V to 3.3V circuit and an analog control MCU, wherein the 5V to 3.3V circuit and the analog control MCU are connected.

[0076] In this embodiment, the analog control board mainly controls and processes the analog part, including the MCU for analog control and the power supply and minimum system circuit for it to work properly.

[0077] In this embodiment, the analog power supply circuit functions as follows: it converts 5V to 3.3V using the AMS1117 power chip to power the entire chip section; A+9V and A-9V provide power to the operational amplifier. J701 is transmitted from the power board.

[0078] In this embodiment, the analog control MCU functions as follows: it controls the STM32F411 MCU chip and the peripheral circuitry provided for its normal operation, including two crystal oscillators, a program download interface, etc.

[0079] like Figure 1-30 In this embodiment of the application, the AC200uA circuit includes: a waveform generator, a high-pass filter, a programmable potentiometer, and a current source output circuit. The high-pass filter is connected to the waveform generator and the programmable potentiometer, the programmable potentiometer is connected to the waveform generator and the current source output circuit, and the current source output circuit is connected to the function switch conversion circuit.

[0080] In the embodiments of this application, the AC200uA circuit mainly generates AC current sources of different magnitudes according to the input digital signal, with the current source output range of 0-220uA and 1-100Hz.

[0081] In this embodiment, the waveform generator functions as follows: The AD9837 is a programmable waveform generator chip capable of generating sine, triangle, and square wave outputs. The SG-210S is an active crystal oscillator that provides the clock required for the AD9837's operation. The waveform output from VOUT has a DC bias and, after passing through a high-pass filter circuit, outputs a waveform of 0.6Vp-p. The AD5292 is a programmable potentiometer; adjusting the potentiometer via a digital signal controls the amplitude of the output waveform.

[0082] In this embodiment, the function of the current source output circuit is as follows: the waveform output by the potentiometer is first amplified by a non-inverting amplifier circuit. When the load is connected, the subsequent operational amplifier forms negative feedback, the potential of the inverting input pin of the operational amplifier is zero, and the waveform of the current flowing through resistor R202 is the same as the waveform of the current flowing through the load. Therefore, the output current can be controlled simply by controlling the current flowing through resistor R202. That is, only the output of the programmable potentiometer needs to be controlled.

[0083] like Figure 1-30In this embodiment of the application, the DC250nA circuit includes: a reference voltage generating circuit, a D / A conversion circuit, and a DC250nA current source output circuit, wherein the D / A conversion circuit is connected to the reference voltage generating circuit and the DC250nA current source output circuit, and the DC250nA current source output circuit is connected to the function switch conversion circuit.

[0084] In the embodiments of this application, the DC250nA circuit mainly generates DC current sources of different magnitudes based on the input digital signal, and the output range of the current source is 0-300nA.

[0085] In this embodiment, the function of the reference voltage generating circuit is as follows: the LT6656 chip can generate a 2.5V reference voltage with high precision and low temperature drift. After being amplified by one time through the non-inverting amplifier circuit, a 5V voltage is generated, providing a stable reference power supply for the D / A conversion chip.

[0086] In this embodiment, the DC250nA current source output circuit functions as follows: the digital signal controls the input voltage of the inverting proportional amplifier circuit via the D / A conversion chip. The op-amp input can be selected using a 0R resistor; another input is an adjustable potentiometer output voltage used for debugging. The final amplifier stage outputs a DC current source. When a load is connected, the op-amp forms negative feedback, the inverting input pin potential is zero, and the current flowing through resistor R301 is equal to the current flowing through the load. Controlling the current through resistor R301 controls the output current.

[0087] like Figure 1-30 In this embodiment of the application, the voltage measurement circuit includes: an instrumentation amplifier, a gain-adjustable amplifier circuit, a low-pass filter, and an A / D converter, wherein the instrumentation amplifier is connected to the function switch conversion circuit and the gain-adjustable amplifier circuit respectively, and the low-pass filter is connected to the gain-adjustable amplifier circuit and the A / D converter respectively.

[0088] In this embodiment, the voltage measurement circuit mainly measures the acquired voltage signal. The differential input voltage signal first enters the instrumentation amplifier, then the gain adjustable operational amplifier circuit selects the voltmeter range, then the low-pass filter filters it, the A / D converter converts it, and the output digital signal is transmitted to the analog control MCU for processing.

[0089] In this embodiment, the gain-adjustable amplifier circuit functions as follows: the input voltage signal is first transmitted to an instrumentation amplifier, which is suitable as an input stage amplifier due to its high input impedance, high common-mode rejection ratio, and low noise. The gain of the instrumentation amplifier in this circuit is 1. The next stage after the instrumentation amplifier is a gain-adjustable operational amplifier circuit. The gain of the operational amplifier can be switched between 1, 11, and 1001 using the ADG444 switching chip. A gain of 1 corresponds to a 5V range, a gain of 11 corresponds to a 400mV range, and a gain of 1001 corresponds to a 5mV range.

[0090] In this embodiment, the function of the low-pass filter is to filter the output signal of the gain-adjustable operational amplifier circuit, and to filter out high-frequency interference signals in the signal. The cutoff frequency of the low-pass filter is 1KHz.

[0091] In this embodiment, the function of the A / D converter is to send the filtered signal to the 16-bit A / D conversion chip ADS8689 to be converted into a digital signal, and then transmit the digital signal to the analog control MCU for processing.

[0092] In this embodiment, the function switch switching circuit mainly performs the switching between two current source outputs and the switching of the voltmeter measurement range. The switching is achieved by controlling a relay, and the entire circuit includes a relay drive circuit and a function switching circuit.

[0093] In this embodiment, the relay driving circuit functions as follows: An N-channel MOSFET is used to drive the relay. The drain of the MOSFET is connected to one end of the relay coil, and the other end of the coil is connected to a 5V power supply. An LED indicator is also connected to the drain of the MOSFET; the LED illuminates when the relay is on. When the logic control MCU outputs a high level, the MOSFET turns on, and the relay operates.

[0094] In this embodiment, the function switching circuit functions as follows: By switching relays RLY103, RLY104, and RLY105, the type of current source output can be selected. When none of the three relays are activated, there is no current source output. Relay RLY103 activates to output a 200µA AC current source, relay RLY104 activates to output a 250µA DC current source, and relay RLY105 activates to output a 200µA AC current source (currently unused). By switching relays RLY102 and RLY106, the voltmeter range can be selected. When both relays RLY102 and RLY106 are activated, the voltmeter is in DC mode; when relay RLY106 is activated and relay RLY102 is not activated, the voltmeter is in AC mode. By switching relays RLY100, RLY101, and RLY102, a defibrillation overload recovery experiment can be performed. When relay RLY101 is activated, the DC 200V charges a 10µF capacitor through a 10K resistor; the voltage across the capacitor is measured in real time. When the capacitor voltage reaches 200V, relay RLY101 disconnects, and relays RLY100 and RLY102 activate. The capacitor discharges through the 100R resistor to the electrodes. Relay RLY102 does not activate, allowing measurement of the voltage across the electrodes. This allows the test to be completed according to the requirements of the defibrillation overload recovery experiment.

[0095] This application also provides a control method for an electrocardiogram electrode testing device, the method comprising the following steps:

[0096] Receive external instructions;

[0097] The touch screen sends control commands to the logic control board according to the external instructions;

[0098] The logic control board parses the control instructions and obtains the control values;

[0099] Determine the relationship between the control value and the detection value;

[0100] Based on the judgment result, the logic control board sends a preset instruction to the scoring circuit.

[0101] The control method for the electrocardiogram electrode tester provided in this application is described below.

[0102] Describing the entire command transmission process requires understanding the software control command protocol. This device uses the 7b7d protocol, the contents of which are as follows:

[0103]

[0104] Among them, 7b ba and others are 8-bit unsigned hexadecimal integers.

[0105] For example, the command 7b 7b B0 BA A6 00 08 01 02 03 04 05 06 07 08 55 7d 7d,

[0106] Address b0 represents the touchscreen, ba represents the logic board, bc represents the analog board, A6 is the command number, here representing the current output command, 00 08 indicates that there are 8 bytes of data, that is, two 32-bit floating-point numbers, representing the current intensity and frequency respectively; 55 represents the checksum. The main command numbers involved are as follows:

[0107] #define COMM_BOTTOM_OUTPUT200V 0xa4 Command to output a 200V voltage source.

[0108] #define COMM_BOTTOM_CLOSE200V 0xa5 Command to disable the 200V voltage source.

[0109] #define COMM_BOTTOM_OUTPUT_SI 0xa6 is the command for outputting current sources.

[0110] #define COMM_BOTTOM_CLOSE_SI 0xa7 This is the command to disable the current source.

[0111] #define COMM_BOTTOM_MEASURE_EN 0xa8 Command to start / stop measurement,

[0112] #define COMM_SET_200uA_FREQ 0x02 Sends a command to set the frequency of a 200uA frequency generator.

[0113] #define COMM_SET_200uA_CURDA 0x03 Sends a 200uA digital-to-analog converter output command.

[0114] #define COMM_SET_250nA_CURDA 0x08 Sends a command to output a 250nA digital-to-analog converter.

[0115] #define COMM_SET_200V_DA 0x82 Sends a 200V digital-to-analog converter output command.

[0116] #define COMM_SET_SW_EN 0x01 Send relay control command,

[0117] The control flow for the current output of the ECG electrode tester provided in this application is as follows:

[0118] The touchscreen receives the current output from the buttons.

[0119] Send the A6 command of the 7b7d protocol to the logic control board.

[0120] After receiving the A6 command, the logic control board parses it to obtain the required output current value I and frequency value f.

[0121] The logic control board determines the current and frequency values ​​based on the received values. If the current value is greater than 250nA and less than 200uA, the logic control board sends commands 02 and 08 to the analog board; if the current value is less than 250nA, the logic control board sends command 08 to the analog board.

[0122] The logic control board sends relay control command 01 to the analog board to complete the current output, such as 7b 7b ba bc 0100 02 05 01 55 7d 7d;

[0123] After receiving the 01 command, the analog board controls the hardware digital-to-analog converter to generate the corresponding analog signal, thus completing the entire current output process.

[0124] The voltage output control flow of the ECG electrode tester provided in this application is as follows:

[0125] The touchscreen receives a voltage output / off button press.

[0126] Send the A4 command of the 7b7d protocol to the logic control board.

[0127] After receiving the A4 command, the logic control board parses it to obtain the required output voltage value U.

[0128] The logic control board then sends an 82 command to the analog board.

[0129] The logic control board sends a relay control 01 command to the analog board to complete the voltage output / shutdown.

[0130] After receiving the 01 command, the analog board controls the digital-to-analog converter to output an analog voltage signal, thus completing the entire voltage output process.

[0131] The control flow for voltage measurement of the ECG electrode tester provided in this application is as follows:

[0132] Touchscreen voltage measurement output / off button.

[0133] Send the A8 command of the 7b7d protocol to the logic control board. For example, 7b 7b ba bc A8 00 02 01 01 55 7d7d.

[0134] After receiving the A8 command, the logic control board parses it to obtain the range setting.

[0135] The logic control board then sends the A8 command to the analog board.

[0136] After receiving the A8 command, the simulation board controls the relay to select the corresponding range.

[0137] The analog board controls the ADC to turn sampling on / off according to the sampling control command (01 on / 00 off), and the voltage measurement control is completed.

[0138] In the embodiments of this application, the electrocardiogram electrode tester provided in this application can realize the traceability of the device output signal and can perform metrological calibration of the device.

[0139] In this embodiment of the application, the defibrillation voltage measurement method of the electrocardiogram electrode tester provided in this application is as follows:

[0140] (1) Access the “Defibrillation Overload Recovery Test” page;

[0141] (2) Connect the positive and negative terminals of the instrument output to the positive and negative terminals of the oscilloscope probe, respectively, and do not connect to the load;

[0142] (3) Set the defibrillation voltage to 200 volts and start the defibrillation test;

[0143] (4) An external oscilloscope can be used to check whether the defibrillation power supply reaches 200V.

[0144] In this embodiment of the application, the current source measurement method of the electrocardiogram electrode tester provided in this application is as follows:

[0145] In the 100uA AC current source test circuit, the DTU is replaced with a 10KΩ standard resistor. To verify that 100uA is the peak-to-peak value of the AC power supply, a multimeter can be used to measure the effective value of the AC power supply, or an oscilloscope can be used to view the peak-to-peak value. The measured effective value needs to be multiplied by 2.828 to convert it to peak-to-peak value. Additionally, note the influence of the input impedance of the multimeter (input impedance must be greater than 10GΩ) or oscilloscope on the test circuit; it is recommended to choose a voltage metering device with an input impedance greater than 1GΩ. The 100nA DC current source test circuit is shown in 5.1.2.

[0146] In the embodiments of this application, the voltage measurement method of an electrocardiogram electrode tester provided by this application is as follows: a suitable voltage is input at the voltage measurement terminal, the input voltage value is measured using the three ranges of the voltmeter, and the measured value is compared with the actual voltage value to determine the accuracy of the voltmeter.

[0147] This application provides an electrocardiogram electrode tester with high measurement accuracy and sensitive response, and it is designed with a traceability calibration interface to ensure the accuracy of the output.

[0148] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An electrocardiogram electrode testing device, characterized in that, include: The system includes a transformer, a power supply board circuit, a logic control board, a DC200V output circuit, a sub-circuit, a function switch conversion circuit, and a touch screen display. The power supply board circuit is connected to the transformer, the logic control board, the DC200V output circuit, the sub-circuit, and the touch screen display. The logic control board is connected to the DC200V output circuit, the sub-circuit, the function switch conversion circuit, and the touch screen display. The function switch conversion circuit is connected to the DC200V output circuit and the sub-circuit. The power board circuit includes: a rectifier circuit, a filter circuit, a voltage regulator circuit, a high-voltage power supply circuit, an analog power supply circuit, and a logic power supply circuit. The filter circuit is connected to the rectifier circuit, the voltage regulator circuit, and the high-voltage power supply circuit, respectively. The voltage regulator circuit is connected to the analog power supply circuit and the logic power supply circuit, respectively. The DC200V output circuit includes: an isolation power supply circuit and a secondary circuit, wherein the isolation power supply circuit and the secondary circuit are connected, and the secondary circuit is connected to the function switch conversion circuit; The secondary circuit includes: a DAC conversion circuit, an optocoupler isolation circuit, a DC 220V output circuit, a defibrillation voltage measurement circuit, and a defibrillation power supply. The DAC conversion circuit is connected to the optocoupler isolation circuit and the DC 220V output circuit, the defibrillation voltage measurement circuit is connected to the optocoupler isolation circuit and the defibrillation power supply, and the DC 220V output circuit is connected to the function switch conversion circuit. It also includes a traceability calibration interface, which enables traceability and metrological calibration of the device's output signal. The specific steps for signal traceability and metrological calibration include: When measuring defibrillation voltage, the positive and negative terminals of the instrument output are connected to the positive and negative terminals of the oscilloscope probe, respectively, without connecting a load. The defibrillation voltage is set to 200 volts, and the defibrillation test is started. The defibrillation power supply is checked using an external oscilloscope to see if it reaches 200V; When measuring current source, the DTU in the 100uA AC current source test circuit is replaced with a 10KΩ standard resistor. The peak-to-peak value is measured using a multimeter or oscilloscope, and the effective value obtained is multiplied by 2.828 to convert it to peak-to-peak value; When measuring voltage, a suitable voltage is input to the voltage measurement terminal, and the input voltage value is measured using the three ranges of the voltmeter. The measured value is compared with the actual voltage value to determine the accuracy of the voltmeter.

2. The electrocardiogram electrode testing device according to claim 1, characterized in that, The sub-circuit includes: an analog control board, an AC200uA circuit, a DC250nA circuit, and a voltage measurement circuit. The analog control board is connected to the logic control board, the AC200uA circuit, the DC250nA circuit, and the voltage measurement circuit, respectively. The function switch conversion circuit is connected to the AC200uA circuit, the DC250nA circuit, and the voltage measurement circuit, respectively.

3. The electrocardiogram electrode testing device according to claim 1, characterized in that, The logic control board includes a 5V to 3.3V circuit and a logic control MCU, wherein the logic control MCU is connected to the 5V to 3.3V circuit and the touch screen display.

4. The electrocardiogram electrode testing device according to claim 2, characterized in that, The analog control board includes a 5V to 3.3V converter circuit and an analog control MCU, wherein the 5V to 3.3V converter circuit and the analog control MCU are connected.

5. The electrocardiogram electrode testing device according to claim 2, characterized in that, The AC200uA circuit includes: a waveform generator, a high-pass filter, a programmable potentiometer, and a current source output circuit. The high-pass filter is connected to the waveform generator and the programmable potentiometer, the programmable potentiometer is connected to the waveform generator and the current source output circuit, and the current source output circuit is connected to the function switch conversion circuit.

6. The electrocardiogram electrode testing device according to claim 2, characterized in that, The DC250nA circuit includes: a reference voltage generating circuit, a D / A conversion circuit, and a DC250nA current source output circuit. The D / A conversion circuit is connected to the reference voltage generating circuit and the DC250nA current source output circuit, respectively, and the DC250nA current source output circuit is connected to the function switch conversion circuit.

7. The electrocardiogram electrode testing device according to claim 2, characterized in that, The voltage measurement circuit includes: an instrumentation amplifier, a gain-adjustable amplifier circuit, a low-pass filter, and an A / D converter. The instrumentation amplifier is connected to the function switch conversion circuit and the gain-adjustable amplifier circuit, respectively, and the low-pass filter is connected to the gain-adjustable amplifier circuit and the A / D converter, respectively.

8. A control method for an electrocardiogram (ECG) electrode testing device, implementing the ECG electrode testing device as described in claim 2, characterized in that, The method includes the following steps: Receive external instructions; The touch screen sends control commands to the logic control board according to the external instructions; The logic control board parses the control instructions and obtains the control values; Determine the relationship between the control value and the detection value; Based on the judgment result, the logic control board sends a preset instruction to the scoring circuit.

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