A portable ECG signal simulation system

Abstract

The utility model provides a portable electrocardiogram signal simulation system, including an electrocardiogram signal simulator, the electrocardiogram signal simulator including an energy supply unit, an embedded operating system, an external storage unit, a digital-to-analog conversion unit, an analog filtering circuit and a main controller, the energy supply unit including a rechargeable lithium battery, the embedded operating system is suitable for storing and outputting a number of standard waveform data or JJG standard waveforms in real time, the standard waveform data including a standard electrocardiogram waveform, a sine wave waveform, a square wave waveform and a triangle waveform, the external storage unit is suitable for expanding the storage capacity to save other waveform data for the embedded operating system to call, the other waveform data is different from the standard waveform data and the JJG standard waveform built into the embedded operating system, the digital-to-analog conversion unit ... The conversion unit is suitable for receiving the code data output by the embedded operating system and converting it into analog quantity. The code data includes standard waveform data and other waveform data, including a digital-to-analog converter (DAC) for generating high-precision ECG signals, which is suitable for providing 16-bit resolution and has eight independent DAC channels, and can control eight different analog quantities simultaneously or independently. The analog quantity can be expressed as an analog voltage. The analog filter circuit is suitable for restoring the analog signal after receiving the analog quantity, and transmitting the analog signal to the instrument to be detected. The main controller includes a 32-bit microprocessor, the microprocessor is transplanted with an embedded operating system, and the microprocessor is electrically connected to the energy supply unit, the embedded operating system, the external storage unit and the digital-to-analog conversion unit. The utility model provides a portable, easy-to-use, high-precision ECG signal simulator, which is powered by a lithium battery and uses a high-precision digital-to-analog converter (DAC) to achieve simulation of any ECG signal, and the signal is smooth and undistorted.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to a portable electrocardiogram signal simulation system. Background Art

[0002] With the continuous development of medical equipment technology, multi-parameter monitors have developed into fully automatic medical instruments that collect and measure multiple physiological parameters such as ECG, non-invasive blood pressure, and blood oxygen saturation, and are widely used in medical and health institutions at all levels. The current national verification regulations include multi-parameter monitors in the catalog of mandatory verification work measuring instruments. So far, statutory metrology technical institutions across the country will conduct mandatory verification of multi-parameter monitors used by medical and health institutions at all levels once a year.

[0003] According to the requirements of the verification regulations, the main metrological standards involved in the verification device of multi-parameter monitors include ECG simulators, non-invasive blood pressure simulators, and pulse oximetry simulators. Since multi-parameter monitors are widely used in clinical medicine in medical and health institutions, statistics show that they are mainly distributed in medical engineering departments, emergency departments, ICU / NICU, operating rooms, respiratory departments, anesthesia departments, general wards, etc. In its clinical medical applications, monitors are usually fixed in specific locations, such as the head of the operating bed, on the equipment tower in the ward, and in the intensive care unit, which is not convenient for centralized mandatory verification. Therefore, the most ideal measuring equipment should have the characteristics of high integration, strong anti-interference ability, simple portability, and stable measurement performance. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a portable electrocardiogram signal simulation system to meet the needs of users.

[0005] To achieve the above object, the utility model provides a portable electrocardiogram signal simulation system, including an electrocardiogram signal simulator, the electrocardiogram signal simulator includes

[0006] Energy supply unit, including a rechargeable lithium battery,

[0007] An embedded operating system, which is suitable for storing and outputting in real time a number of standard waveform data or JJG standard waveforms, wherein the standard waveform data includes a standard ECG waveform, a sine wave waveform, a square wave waveform and a triangle waveform,

[0008] An external storage unit, which is suitable for expanding storage capacity to store other waveform data for the embedded operating system to call, the other waveform data is different from the standard waveform data and JJG standard waveform built into the embedded operating system,

[0009] A digital-to-analog conversion unit, adapted to receive the code data output by the embedded operating system and convert it into an analog quantity, wherein the code data includes the standard waveform data and the other waveform data, and includes a digital-to-analog converter (DAC) for generating a high-precision ECG signal, which is adapted to provide a 16-bit resolution and has eight independent DAC channels, and can simultaneously or independently control eight different analog quantities, wherein the analog quantities can be expressed as analog voltages.

[0010] The analog filter circuit is adapted to restore the analog signal after receiving the analog quantity and transmit the analog signal to the instrument to be detected.

[0011] The main controller includes a 32-bit microprocessor, the microprocessor is transplanted with the embedded operating system, and the microprocessor is electrically connected to the energy supply unit, the embedded operating system, the external storage unit and the digital-to-analog conversion unit respectively.

[0012] Preferably, the digital-to-analog converter has monotonicity, so that there is an excellent linear relationship between the code data and the analog voltage, and the transient voltage generated during the code conversion process is reduced, thereby reducing noise and errors in the conversion process.

[0013] Preferably, the digital-to-analog converter includes a power-on reset circuit, which is suitable for ensuring that the digital-to-analog converter outputs a predetermined initial state when it is powered on for the first time. The initial state can be a zero level or an intermediate level, thereby achieving a safe startup and reducing damage or noise caused to the digital-to-analog converter by external circuits.

[0014] Preferably, the digital-to-analog converter has a low power consumption mode. Specifically, when the digital-to-analog converter is suitable for reducing the current consumption to 0.18 μA when the supply voltage is 5 V, the main controller is suitable for activating or deactivating the low power consumption mode through the serial communication interface.

[0015] Preferably, a reference voltage circuit suitable for providing a reference voltage of 2.048V is provided between the main controller and the digital-to-analog converter, and the reference voltage circuit adopts REF3020 as a reference voltage chip, which has a quiescent current of 42μA.

[0016] Preferably, the analog filter circuit adopts 1591 Hz low-pass filtering to remove high-frequency noise mixed in the analog signal.

[0017] Preferably, the microprocessor adopts the ARM Cortex-M3 core with a maximum operating frequency of up to 108MHz, provides up to 3024KB of on-chip flash memory and up to 96KB of SRAM, supports enhanced I / O ports connected to two APB buses and various on-chip peripherals, uses a 32.768kHz quartz crystal as an auxiliary clock source for a low-power real-time clock, and a 16MHz quartz crystal as the main clock source.

[0018] As a preferred embodiment: the external storage unit is a TF card, and the main controller is suitable for reading or calling the other waveform data through the TF card reading circuit.

[0019] As a preferred embodiment: it also includes host computer software, which is suitable for editing and obtaining the other waveform data and transcribing it to the TF card. The host computer software is suitable for performing four editing operations: EDF to BEF, Holter to BEF, BEF to BEF and BEF insertion pacing. The host computer software is also suitable for expressing the other waveform data as waveforms for display.

[0020] As a preferred embodiment: the ECG signal simulator includes a shell, an LCD screen embedded in the front of the shell, an indicator light and a plurality of buttons, a TF card slot and a charging interface embedded in the bottom of the shell, the main controller, the digital-to-analog conversion unit and the analog filter circuit are integrated with a control circuit board, the energy supply unit and the control circuit board are built into the shell, and the TF card slot and the charging interface are directly electrically connected to the control circuit board.

[0021] Preferably: the lithium battery is connected to the charging interface through a charging circuit, and the LCD screen, indicator light, button, TF card, power on / off control, and DA conversion circuit are respectively connected to the main controller; the LCD screen, indicator light, button, TF card, power on / off control, DA conversion circuit, analog filter circuit and main controller are respectively connected to the power supply and the charging circuit. Specifically, the main controller is connected to the LCD screen through an LCD display circuit, and the main controller is connected to several of the buttons through a button response circuit.

[0022] The beneficial effects of the utility model are:

[0023] (1) A portable, easy-to-use, high-precision ECG signal simulator is provided. It is powered by a lithium battery and uses a high-precision digital-to-analog converter (DAC) to simulate any ECG signal. The signal is smooth and undistorted. The original data can be edited arbitrarily by using the host computer software to modify the signal frequency, amplitude and other parameters, enriching the types and quantity of other waveform data and making it more applicable.

[0024] (2) The device uses a liquid crystal screen, buttons and indicator lights for human-computer interaction and a compact structural design, thus realizing a small and portable electrocardiograph that allows users to operate the device with simple operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a hardware structure block diagram of the electrocardiogram signal simulator provided by the utility model.

[0026] Figure 2 This is a schematic diagram of the appearance of the electrocardiogram signal simulator provided by the utility model.

[0027] Figure 3 This is an embedded software block diagram of the electrocardiogram signal simulator provided by the utility model.

[0028] Figure 4 The utility model provides a software flow chart of the upper computer.

[0029] In the figure, button 1, LCD screen 2, indicator light 3, TF card slot 4, charging port 5. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0032] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0033] like Figure 1-4As shown, the utility model provides a portable ECG signal simulation system, including an ECG signal simulator, the ECG signal simulator includes an energy supply unit, an embedded operating system, an external storage unit, a digital-to-analog conversion unit, an analog filtering circuit and a main controller, the energy supply unit includes a rechargeable lithium battery, the embedded operating system is suitable for storing and outputting a number of standard waveform data or JJG standard waveforms in real time, the standard waveform data includes a standard ECG waveform, a sine wave waveform, a square wave waveform and a triangle waveform, the external storage unit is suitable for expanding the storage capacity to save other waveform data for the embedded operating system to call, the other waveform data is different from the standard waveform data and the JJG standard waveform built into the embedded operating system, the digital-to-analog conversion unit It is suitable for receiving code data output by the embedded operating system and converting it into analog quantity. The code data includes standard waveform data and other waveform data. It includes a digital-to-analog converter (DAC) for generating high-precision electrocardiogram signals. It is suitable for providing 16-bit resolution and has eight independent DAC channels. It can control eight different analog quantities simultaneously or independently. The analog quantity can be expressed as an analog voltage. The analog filter circuit is suitable for restoring the analog signal after receiving the analog quantity and transmitting the analog signal to the instrument to be detected. The main controller includes a 32-bit microprocessor. The microprocessor is transplanted with an embedded operating system. The microprocessor is electrically connected to the energy supply unit, the embedded operating system, the external storage unit and the digital-to-analog conversion unit respectively.

[0034] In this embodiment, the digital-to-analog converter (DAC) includes an internal reference voltage of 2.5V and 2ppm / ℃, which can provide a full-scale output voltage range of 2.5V or 5V, which can significantly reduce the scale of the hardware circuit and improve reliability and accuracy. At the same time, the digital-to-analog converter has monotonicity, so that there is an excellent linear relationship between the code data and the analog voltage, and the transient voltage generated during the code conversion process is reduced, thereby reducing the noise and error in the conversion process. In addition, the digital-to-analog converter includes a power-on reset circuit, which is suitable for ensuring that the digital-to-analog converter outputs a predetermined initial state when it is first powered on. The initial state can be a zero level or an intermediate level, thereby achieving safe startup and reducing damage or noise caused by external circuits to the digital-to-analog converter. In addition, the digital-to-analog converter has a low power consumption mode. Specifically, when the digital-to-analog converter is suitable for reducing the current consumption to 0.18μA when the supply voltage is 5V, the main controller is suitable for activating or deactivating the low power consumption mode through the serial communication interface. In summary, the digital-to-analog converter (DAC) has the characteristics of low power consumption, internal reference voltage and small package size, and is very suitable for portable, battery-powered electrocardiographs.

[0035] In this embodiment, a reference voltage circuit suitable for providing a reference voltage of 2.048V is provided between the main controller and the digital-to-analog converter. The reference voltage circuit uses REF3020 as a reference voltage chip, which has a quiescent current of 42μA.

[0036] In this embodiment, the analog filter circuit uses a 1591 Hz low-pass filter to remove high-frequency noise mixed in the analog signal.

[0037] In this embodiment, the microprocessor adopts the ARM Cortex-M3 core, the highest operating frequency can reach 108MHz, provides up to 3024KB of on-chip flash memory and up to 96KB of SRAM, supports enhanced I / O ports connected to two APB buses and various on-chip peripherals, uses a 32.768kHz quartz crystal as an auxiliary clock source for a low-power real-time clock, and a 16MHz quartz crystal as the main clock source, which is very suitable for embedded systems that need to work for a long time with battery power. Specifically, the GD32 series microprocessor of GigaDevice can be selected.

[0038] In this embodiment, the external storage unit is a TF card, and the portable ECG signal simulation system also includes a host computer software, which exchanges data with the simulator host through the TF card, and is suitable for editing and obtaining other waveform data and transcribing it to the TF card. The host computer software uses the C++ development interface and the Xtreme ToolkitPro framework to realize the waveform display and data format conversion functions. The main functions are divided into four parts: EDF to BEF, Holter to BEF, BEF to BEF and BEF insertion pacing. The BEF format is a custom data format for the simulator, and all external data needs to be converted to BEF format data before it can be read by the simulator. EDF and Holter data are both common ECG data formats, and the host computer software can convert all these ECG data into BEF format for the simulator to read. BEF to BEF can change the sampling rate of BEF data and improve data accuracy. BEF insertion pacing is used for editing special pacing ECG signals.

[0039] In this embodiment, the ECG signal simulator includes a housing, a liquid crystal screen 2 embedded in the front of the housing, an indicator light 3 and a plurality of buttons 1, a TF card slot 4 and a charging interface 5 embedded in the bottom of the housing. The main controller, the digital-to-analog conversion unit and the analog filter circuit are integrated with the control circuit board, the power supply unit and the control circuit board are built into the housing, and the TF card slot 4 and the charging interface 5 are directly electrically connected to the control circuit board.

[0040] In this embodiment, the lithium battery is connected to the charging interface 5 through a charging circuit, and the LCD screen 2, indicator light 3, button 1, TF card, power on / off control, and DA conversion circuit are respectively connected to the main controller; the LCD screen 2, indicator light 3, button 1, TF card, power on / off control, DA conversion circuit, analog filter circuit and main controller are respectively connected to the power supply and charging circuit. Specifically, the main controller is connected to the LCD screen 2 through the LCD screen 2 display circuit, and the main controller is connected to several buttons 1 through the button 1 response circuit.

[0041] In this embodiment, after receiving the power-on response of button 1, the embedded program will enter the main interface, display all function menus, and periodically update the power of the ECG signal simulator to prompt whether it needs to be charged. The function menu mainly includes three parts: standard waveform output, preset JJG standard output, and TF card data reading. Under the marked waveform output function, the simulator can emit standard sine waves, square waves, and ECG waveforms, which can be set to different frequencies (heart rates) and amplitudes; under the preset JJG standard output function, the simulator can emit the waveforms required for measurement according to the measurement standard sequence; under the TF card data reading function, the simulator can read the data generated by the host computer software and convert the data into analog signal output.

[0042] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A portable electrocardiogram signal simulation system, characterized in that: It includes an electrocardiogram signal simulator, the electrocardiogram signal simulator includes Energy supply unit, including a rechargeable lithium battery, An embedded operating system, which is suitable for storing and outputting in real time a number of standard waveform data or JJG standard waveforms, wherein the standard waveform data includes a standard ECG waveform, a sine wave waveform, a square wave waveform and a triangle waveform, An external storage unit, which is suitable for expanding storage capacity to store other waveform data for the embedded operating system to call, the other waveform data is different from the standard waveform data and JJG standard waveform built into the embedded operating system, A digital-to-analog conversion unit, adapted to receive the code data output by the embedded operating system and convert it into an analog quantity, wherein the code data includes the standard waveform data and the other waveform data, and includes a digital-to-analog converter (DAC) for generating a high-precision ECG signal, which is adapted to provide a 16-bit resolution and has eight independent DAC channels, and can simultaneously or independently control eight different analog quantities, wherein the analog quantities can be expressed as analog voltages. The analog filter circuit is adapted to restore the analog signal after receiving the analog quantity and transmit the analog signal to the instrument to be detected. The main controller includes a 32-bit microprocessor, the microprocessor is transplanted with the embedded operating system, and the microprocessor is electrically connected to the energy supply unit, the embedded operating system, the external storage unit and the digital-to-analog conversion unit respectively.

2. A portable ECG signal simulation system according to claim 1, characterized in that: The digital-to-analog converter has monotonicity, so that there is an excellent linear relationship between the code data and the analog voltage, and the transient voltage generated during the code conversion process is reduced, thereby reducing noise and errors in the conversion process.

3. A portable ECG signal simulation system according to claim 2, characterized in that: The digital-to-analog converter includes a power-on reset circuit, which is suitable for ensuring that the digital-to-analog converter outputs a predetermined initial state when it is powered on for the first time. The initial state can be a zero level or an intermediate level, thereby achieving safe startup and reducing damage or noise caused to the digital-to-analog converter by external circuits.

4. A portable ECG signal simulation system according to claim 3, characterized in that: The DAC has a low power consumption mode. Specifically, when the DAC is suitable for reducing current consumption to 0.18 μA when the supply voltage is 5 V, the main controller is suitable for activating or deactivating the low power consumption mode through the serial communication interface.

5. A portable ECG signal simulation system according to claim 4, characterized in that: A reference voltage circuit suitable for providing a reference voltage of 2.048V is provided between the main controller and the digital-to-analog converter. The reference voltage circuit uses REF3020 as a reference voltage chip, which has a quiescent current of 42μA.

6. A portable ECG signal simulation system according to claim 5, characterized in that: The analog filter circuit uses 1591 Hz low-pass filtering to remove high-frequency noise mixed in the analog signal.

7. A portable ECG signal simulation system according to claim 6, characterized in that: The microprocessor adopts the ARM Cortex-M3 core with a maximum operating frequency of 108MHz, provides up to 3024KB of on-chip flash memory and up to 96KB of SRAM, supports enhanced I / O ports connected to two APB buses and various on-chip peripherals, uses a 32.768kHz quartz crystal as an auxiliary clock source for a low-power real-time clock, and a 16MHz quartz crystal as the main clock source.

8. A portable ECG signal simulation system according to claim 7, characterized in that: The external storage unit is a TF card, and the main controller is suitable for reading or calling the other waveform data through the TF card reading circuit. It also includes host computer software, which is suitable for editing and obtaining the other waveform data and transcribing it to the TF card. The host computer software is suitable for performing four editing operations: EDF to BEF, Holter to BEF, BEF to BEF and BEF insertion pacing. The host computer software is also suitable for expressing the other waveform data as waveforms for display.

9. A portable ECG signal simulation system according to claim 8, characterized in that: The ECG signal simulator includes a shell, a liquid crystal screen embedded in the front of the shell, an indicator light and a plurality of buttons, a TF card slot and a charging interface embedded in the bottom of the shell, the main controller, the digital-to-analog conversion unit and the analog filter circuit are integrated with a control circuit board, the energy supply unit and the control circuit board are built into the shell, and the TF card slot and the charging interface are directly electrically connected to the control circuit board.

10. A portable ECG signal simulation system according to claim 9, characterized in that: The lithium battery is connected to the charging interface through a charging circuit, and the LCD screen, indicator light, button, TF card, power on / off control, and DA conversion circuit are respectively connected to the main controller; the LCD screen, indicator light, button, TF card, power on / off control, DA conversion circuit, analog filter circuit and main controller are respectively connected to the power supply and charging circuit. Specifically, the main controller is connected to the LCD screen through an LCD display circuit, and the main controller is connected to several of the buttons through a button response circuit.

Images