Electrocardiographic monitoring device

Abstract

The utility model relates to a kind of electrocardiograph monitoring equipment, belong to electrocardiograph monitoring technical field, this electrocardiograph monitoring equipment includes: front-end signal processing circuit, for the filtered processing of input lead signal, obtain filtered lead signal;Lead signal includes 3 lead signal or 5 lead signal;Drive signal processing circuit, for selecting drive signal in filtered lead signal based on the waveform to be displayed and selecting drive lead in lead;Drive lead and drive signal are used to eliminate common-mode interference signal;Collector, for collecting lead signal after eliminating common-mode interference signal, generate electrocardiogram waveform.The utility model is built using discrete circuit to realize simultaneously supporting 5 lead and 3 lead electrocardiograph acquisition, can select different price and performance discrete component to build electrocardiograph monitoring system according to actual demand, optimize cost, while discrete circuit can be customized according to specific application requirement Design, function extension is more convenient, improve flexibility.

Description

Technical Field

[0001] This utility model relates to the field of electrocardiogram (ECG) monitoring technology, and in particular to an ECG monitoring device. Background Technology

[0002] In electrocardiogram (ECG) monitoring equipment, the most commonly used modes are 5-lead and 3-lead. The 5-lead mode utilizes five leads—right arm (RA), left arm (LA), left leg (LL), right leg (RL), and chest lead (V)—to simultaneously display multiple ECG waveforms, including those in leads I, II, III, aVR, aVL, aVF, and V. The 3-lead mode uses three limb leads—right arm (RA), left arm (LA), and left leg (LL)—to display waveforms in leads I, II, and III. With continuous technological advancements, new ECG monitoring equipment on the market can support both 5-lead and 3-lead modes simultaneously, providing physicians with more options.

[0003] Commonly used ECG monitoring devices employ integrated analog front-end ICs, which allow switching between 5-lead and 3-lead modes through register configuration. These integrated analog front-end ICs are generally expensive and offer limited flexibility. Utility Model Content

[0004] In view of this, it is necessary to provide an electrocardiogram (ECG) monitoring device that addresses the issues of how to reduce the cost of ECG monitoring devices and improve their flexibility.

[0005] To address the above problems, this utility model provides an electrocardiogram (ECG) monitoring device, comprising:

[0006] Front-end signal processing circuit, drive signal processing circuit, and data acquisition unit;

[0007] The output terminal of the front-end signal processing circuit is connected to the drive signal processing circuit and the data acquisition unit, respectively.

[0008] The output terminal of the drive signal processing circuit is connected to the input terminal of the front-end signal processing circuit;

[0009] The front-end signal processing circuit is used to filter the input lead signal to obtain the filtered lead signal; the lead signal includes a 3-lead signal or a 5-lead signal.

[0010] The drive signal processing circuit is used to select a drive signal from the filtered lead signal based on the waveform to be displayed, and to select a drive lead from the leads; the drive lead and the drive signal are used to eliminate common-mode interference signals;

[0011] The acquisition device is used to acquire lead signals after common-mode interference signals have been eliminated, and generate electrocardiogram waveforms.

[0012] In one possible implementation, the drive signal processing circuit includes:

[0013] First analog switch, adder, driver amplifier, and second analog switch;

[0014] The first analog switch, the adder, the driver amplifier, and the second analog switch are connected in sequence;

[0015] The first analog switch is used to select a common-mode drive signal in the filtered lead signal based on the waveform to be displayed;

[0016] The adder is used to perform addition operations on the common-mode drive signal to obtain the addition result;

[0017] The driving amplifier is used to amplify the result of the addition operation to obtain the driving signal;

[0018] The second analog switch is used to select the drive lead based on the waveform to be displayed.

[0019] In one possible implementation, the first analog switch is a three-channel single-pole single-throw analog switch;

[0020] Each channel of the three-channel single-pole single-throw analog switch corresponds to the LA signal, RA signal, and LL signal, respectively.

[0021] In one possible implementation, the second analog switch is a four-channel single-pole single-throw analog switch;

[0022] Each channel of the four-channel single-pole single-throw analog switch corresponds to lead RL, lead LL, lead LA, and lead RA, respectively.

[0023] In one possible implementation, when the lead signal is a 5-lead signal and the waveform to be displayed is a lead I waveform, a lead II waveform, and a lead III waveform, the first analog switch is used to select the LA signal, the RA signal, and the LL signal as common-mode drive signals, and the second analog switch is used to select the RL lead as the drive lead.

[0024] In one possible implementation, when the lead signal is a 3-lead signal and the waveform to be displayed is an I-lead waveform, the first analog switch is used to select the LA and RA signals as common-mode drive signals, and the second analog switch is used to select the LL lead as the drive lead.

[0025] When the lead signal is a 3-lead signal and the waveform to be displayed is a II-lead waveform, the first analog switch is used to select the RA and LL signals as common-mode drive signals, and the second analog switch is used to select the LA lead as the drive lead.

[0026] When the lead signal is a 3-lead signal and the waveform to be displayed is a III-lead waveform, the first analog switch is used to select the LA and LL signals as common-mode drive signals, and the second analog switch is used to select the RA lead as the drive lead.

[0027] In one possible implementation, the front-end signal processing circuit includes:

[0028] First RC filter circuit, follower isolation circuit, and second RC filter circuit;

[0029] The first RC filter circuit, the follower isolation circuit, and the second RC filter circuit are connected in sequence;

[0030] The filter cutoff frequency of the first RC filter circuit is higher than that of the second RC filter circuit.

[0031] In one possible implementation, the front-end signal processing circuit further includes:

[0032] Gas discharge tubes, TVS diodes, and clamping diodes;

[0033] The gas discharge tube, the TVS tube, and the clamping diode are connected in parallel with the first RC filter circuit.

[0034] In one possible implementation, the acquisition unit is specifically used to perform differential calculations based on the lead signals after common-mode interference signal elimination to generate the electrocardiogram waveform.

[0035] In one possible implementation, the acquisition device is a differential 24-bit delta-sigma ADC.

[0036] The beneficial effects of this utility model are as follows: The electrocardiogram (ECG) monitoring device provided by this utility model filters the input 3-lead or 5-lead signal through a front-end signal processing circuit. The drive signal processing circuit determines the drive signal and drive lead based on the waveform to be displayed and the filtered lead signal. Thus, the front-end signal processing circuit feeds the drive signal back to the human body through the drive lead to eliminate common-mode interference signals. Subsequently, the acquisition unit can acquire the lead signal after eliminating common-mode interference signals to generate an ECG waveform. This utility model uses discrete circuits to simultaneously support 5-lead and 3-lead ECG acquisition. Different discrete components with different prices and performance can be selected to build the ECG monitoring system according to actual needs, thereby optimizing costs. At the same time, the discrete circuits can be customized according to specific application requirements, making functional expansion more convenient and improving flexibility. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 One of the structural schematic diagrams of an embodiment of the electrocardiogram monitoring device provided by this utility model;

[0039] Figure 2 A schematic diagram of the drive signal processing circuit provided by this utility model;

[0040] Figure 3 The schematic diagram of the driving signal processing provided by this utility model;

[0041] Figure 4 The front-end signal processing schematic diagram provided by this utility model;

[0042] Figure 5 This is a second schematic diagram of the structure of an embodiment of the electrocardiogram monitoring device provided by this utility model. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0044] In the description of the embodiments of this utility model, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0045] The terms "first," "second," etc., used in the embodiments of this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0046] Before demonstrating the embodiments, the driving leads will be explained.

[0047] The human body naturally contains various common-mode interference signals, which severely affect the accuracy and clarity of electrocardiogram (ECG) signals. In ECG acquisition, drive technology is typically used to eliminate these common-mode interference signals. Drive technology primarily involves extracting the common-mode voltage from limb leads, then amplifying and inverting this voltage before feeding it back to a specific lead, known as the drive lead. This drive lead does not participate in ECG signal calculation, thus canceling out the existing common-mode interference and resulting in a purer and more accurate acquired ECG signal.

[0048] This utility model provides an electrocardiogram monitoring device, which will be described in detail below.

[0049] Figure 1 One of the structural schematic diagrams of an embodiment of the electrocardiogram monitoring device provided by this utility model is shown below. Figure 1 As shown, the electrocardiogram monitoring equipment includes:

[0050] Front-end signal processing circuit 110, drive signal processing circuit 120 and acquisition unit 130;

[0051] The output terminal of the front-end signal processing circuit 110 is connected to the drive signal processing circuit 120 and the acquisition unit 130, respectively.

[0052] The output terminal of the drive signal processing circuit 120 is connected to the input terminal of the front-end signal processing circuit 110;

[0053] The front-end signal processing circuit 110 is used to filter the input lead signal to obtain the filtered lead signal; the lead signal includes a 3-lead signal or a 5-lead signal.

[0054] The drive signal processing circuit 120 is used to select a lead signal from the filtered lead signal based on the waveform to be displayed, and to select a drive lead from the leads; the drive lead and the drive signal are used to eliminate common-mode interference signals;

[0055] The acquisition unit 130 is used to acquire lead signals after eliminating common-mode interference signals and generate electrocardiogram waveforms.

[0056] The front-end signal processing circuit is used to filter the input lead signals and remove electrosurgical signals. It can also perform defibrillation protection and follow-up processing.

[0057] The input lead signals are either 3-lead signals or 5-lead signals. The 3-lead signals are RA, LA, and LL signals, and the 5-lead signals are RA, LA, LL, RL, and V signals.

[0058] The drive signal processing circuit can determine the drive signal and drive leads based on the waveform to be displayed and the filtered lead signal. The waveform to be displayed includes lead I waveform, lead II waveform, or lead III waveform, and the waveform to be displayed can be determined according to user requirements.

[0059] Among them, the waveform of lead I is determined based on the potential difference between LA and RA, the waveform of lead II is determined based on the potential difference between LL and RA, and the waveform of lead III is determined based on the potential difference between LL and LA.

[0060] For example, when the lead signal is a 3-lead signal and the waveform to be displayed is a 1-lead waveform, the LA and RA signals can be selected as common-mode drive signals, the drive signal can be calculated using the common-mode drive signals, and the LL lead can be selected as the drive lead.

[0061] When the lead signal is a 5-lead signal and the waveform to be displayed is the waveform of lead I, lead II, and lead III, the LA, RA, and LL signals can be selected as common-mode drive signals. The drive signal is calculated through the common-mode drive signal, and lead RL is selected as the drive lead.

[0062] The front-end signal processing circuit is also used to feed the drive signal back to the human body through the drive leads to eliminate common-mode interference signals. Then, the acquisition unit can acquire the lead signals after eliminating common-mode interference signals and generate an electrocardiogram waveform.

[0063] Compared with existing technologies, the ECG monitoring device provided in this embodiment of the present invention filters the input 3-lead or 5-lead signal through a front-end signal processing circuit. The drive signal processing circuit determines the drive signal and drive lead based on the waveform to be displayed and the filtered lead signal. Thus, the front-end signal processing circuit feeds the drive signal back to the human body through the drive lead to eliminate common-mode interference signals. Subsequently, the acquisition unit can acquire the lead signal after eliminating common-mode interference signals to generate an ECG waveform. This invention uses discrete circuits to simultaneously support 5-lead and 3-lead ECG acquisition. Different discrete components with different prices and performance can be selected to build the ECG monitoring system according to actual needs, thereby optimizing costs. At the same time, the discrete circuits can be customized according to specific application requirements, making functional expansion more convenient and improving flexibility.

[0064] In some embodiments of this utility model, the drive signal processing circuit 120 includes:

[0065] First analog switch, adder, driver amplifier, and second analog switch;

[0066] The first analog switch, the adder, the driver amplifier, and the second analog switch are connected in sequence;

[0067] The first analog switch is used to select a common-mode drive signal in the filtered lead signal based on the waveform to be displayed;

[0068] The adder is used to perform addition operations on the common-mode drive signal to obtain the addition result;

[0069] The driving amplifier is used to amplify the result of the addition operation to obtain the driving signal;

[0070] The second analog switch is used to select the drive lead based on the waveform to be displayed.

[0071] In some embodiments of this utility model, the first analog switch is a three-channel single-pole single-throw analog switch;

[0072] Each channel of the three-channel single-pole single-throw analog switch corresponds to the LA signal, RA signal, and LL signal, respectively.

[0073] In some embodiments of this utility model, the second analog switch is a four-channel single-pole single-throw analog switch;

[0074] Each channel of the four-channel single-pole single-throw analog switch corresponds to lead RL, lead LL, lead LA, and lead RA, respectively.

[0075] Figure 2 This is a schematic diagram of the drive signal processing circuit provided by this utility model. Figure 3 The schematic diagram of the driving signal processing provided by this utility model is as follows: Figure 2 and Figure 3 As shown, the drive signal processing circuit includes a first analog switch (analog switch 1), an adder, a drive amplifier, and a second analog switch (analog switch 2).

[0076] like Figure 2 As shown, the first analog switch is a three-channel single-pole single-throw analog switch, with each channel corresponding to the LA, RA, and LL signals, respectively. The first analog switch can select the common-mode drive signal from the filtered lead signal based on the waveform to be displayed.

[0077] The adder is used to perform addition operations on the common-mode drive signal selected by the first analog switch to obtain the addition result.

[0078] The driver amplifier is used to amplify the result of the addition operation to obtain the driving signal.

[0079] like Figure 2 As shown, the second analog switch is a four-channel single-pole single-throw analog switch, with each channel corresponding to lead RL, lead LL, lead LA, and lead RA, respectively.

[0080] The second analog switch can select the driving lead from the above-mentioned RL, LL, LA, and RA leads according to the waveform to be displayed.

[0081] The drive signal passes through the second analog switch and selects the corresponding drive lead to be fed back to the human body in order to eliminate common-mode interference signals.

[0082] In some embodiments of this utility model, when the lead signal is a 5-lead signal and the waveform to be displayed is a lead I waveform, a lead II waveform, and a lead III waveform, the first analog switch is used to select the LA signal, the RA signal, and the LL signal as common-mode drive signals, and the second analog switch is used to select the RL lead as the drive lead.

[0083] For the 5-lead input signals RA, LA, LL, RL, and V, they first undergo defibrillation protection, filtering, and tracking processing by the front-end signal processing circuit. Then, the RA, LA, LL, RL, and V signals are sent in pairs to a 24-bit differential AD converter for ECG data acquisition.

[0084] In addition, RA, LA, and LL serve as common-mode drive signal inputs and are simultaneously fed into the first analog switch, where they are processed by an adder circuit and an amplifier circuit to generate drive signals.

[0085] The drive signal returns to the front-end signal processing circuit after passing through the second analog switch, and then returns to the human body via the RL lead.

[0086] In some embodiments of this utility model, when the lead signal is a 3-lead signal and the waveform to be displayed is a 1-lead waveform, the first analog switch is used to select the LA signal and the RA signal as common-mode drive signals, and the second analog switch is used to select the LL lead as the drive lead;

[0087] When the lead signal is a 3-lead signal and the waveform to be displayed is a II-lead waveform, the first analog switch is used to select the RA and LL signals as common-mode drive signals, and the second analog switch is used to select the LA lead as the drive lead.

[0088] When the lead signal is a 3-lead signal and the waveform to be displayed is a III-lead waveform, the first analog switch is used to select the LA and LL signals as common-mode drive signals, and the second analog switch is used to select the RA lead as the drive lead.

[0089] For the 3-lead input signals RA, LA, and LL, the method for ECG data acquisition is the same as for the 5-lead input. However, for common-mode drive signal processing, since there are only three leads, each waveform is obtained by differential measurement of two different lead signals, with the third lead serving as the drive lead.

[0090] The switching method of the drive leads when there is a 3-lead input is as follows: First, the first analog switch is used to process RA, LA, and LL to remove the drive lead signals (since the drive leads are output leads, they do not participate in the calculation of common-mode voltage). Then, the drive signals are generated through the adder circuit and the amplifier circuit.

[0091] The drive signal passes through the second analog switch and selects the corresponding drive lead to feed back to the human body.

[0092] In summary, the drive signal processing circuit is shown below:

[0093] The RA, LA, and LL limb lead signals first pass through a single-pole single-throw analog switch 1 to select whether the limb lead signals participate in the drive signal calculation.

[0094] For a 5-lead input, all three limb lead signals participate in the drive signal calculation.

[0095] For a 3-lead input, the two leads other than the driving lead participate in the driving lead calculation.

[0096] The signal output of analog switch 1 is fed into the positive terminal of the adder operational amplifier for addition. The output of the adder operational amplifier is then input to the negative terminal of the driver amplifier operational amplifier for inverse amplification. The amplification factor here is relatively large, typically 100 times.

[0097] The amplified drive signal is then used for channel selection via the four-to-one analog switch 2. For a 5-lead signal, RL is selected as the drive lead. For a 3-lead signal, the drive lead is selected according to the analog switch switching rules shown in Table 1.

[0098] Table 1: Analog Switch Switching Rules

[0099]

[0100] The electrocardiogram (ECG) monitoring device provided by this utility model uses discrete circuits to realize the automatic switching between 5-lead and 3-lead ECG monitoring drive leads. It provides a discrete component-based 3-lead automatic switching drive lead scheme. The MCU automatically configures the analog switches to turn on and off the corresponding channels according to the user-selected display waveform, thereby realizing the automatic switching between acquisition leads and drive leads.

[0101] In some embodiments of this utility model, the front-end signal processing circuit 110 includes:

[0102] First RC filter circuit, follower isolation circuit, and second RC filter circuit;

[0103] The first RC filter circuit, the follower isolation circuit, and the second RC filter circuit are connected in sequence;

[0104] The filter cutoff frequency of the first RC filter circuit is higher than that of the second RC filter circuit.

[0105] Figure 4 The front-end signal processing schematic diagram provided for this utility model is as follows: Figure 4 As shown, the front-end signal processing circuit includes a first RC filter circuit, a follower isolation circuit, and a second RC filter circuit.

[0106] The first RC filter circuit is a two-stage RC filter circuit, and the filter cutoff frequency of the first RC filter circuit is higher than that of the second RC filter circuit.

[0107] The front-end signal processing circuit is optimized for anti-electrocution design. Since the electrosurgical frequency is generally above 200kHz, different cutoff frequency filters are used before and after the follow-up process. The cutoff frequency of the filter before the follow-up process (i.e., the cutoff frequency of the first RC filter circuit) is higher than the cutoff frequency of the filter after the follow-up process (i.e., the cutoff frequency of the second RC filter circuit).

[0108] The filter cutoff frequency before the signal is relatively high (e.g., 160kHz) to ensure that the input impedance is not affected, thus performing primary filtering on the electrosurgical signal.

[0109] The subsequent filter cutoff frequency is low (e.g., 10kHz), which greatly attenuates electrosurgical interference and ensures the quality of the ECG signal.

[0110] like Figure 4 As shown, for the 5-lead mode, the input signals RA, LA, LL, RL, and V (for the 3-lead mode, the input signals are RA, LA, and LL) pass through a gas discharge tube (GDT), a TVS, and two stages of RC filtering before being sent to an operational amplifier for follower isolation. A second RC filtering is then performed. The cutoff frequency of the second filter is relatively low, approximately 10kHz, primarily filtering out interference signals from the electrosurgical unit. The filtered signal is then sent to the data acquisition unit.

[0111] The electrocardiogram (ECG) monitoring device provided by this invention employs an optimized anti-electrosurgical design in its front-end signal processing circuit. Different cutoff frequency filters are used before and after the electrosurgical signal. The pre-follow-up filter has a high cutoff frequency to ensure that the input impedance is not affected, performing primary filtering on the electrosurgical signal. The post-follow-up filter has a low cutoff frequency, significantly attenuating electrosurgical interference and ensuring ECG signal quality.

[0112] In some embodiments of this utility model, the front-end signal processing circuit 110 further includes:

[0113] Gas discharge tubes, TVS diodes, and clamping diodes;

[0114] The gas discharge tube, the TVS tube, and the clamping diode are connected in parallel with the first RC filter circuit.

[0115] The front-end signal processing circuit also includes a gas discharge tube (GDT), a TVS diode, and a clamping diode. The gas discharge tube is used for defibrillation protection, the TVS diode is used for electrostatic discharge protection, and the clamping diode is used for overvoltage protection, to further improve the safety of the ECG monitoring equipment.

[0116] In some embodiments of this utility model, the acquisition device 130 is specifically used to perform differential calculations based on the lead signals after eliminating common-mode interference signals to generate the electrocardiogram waveform.

[0117] In some embodiments of this utility model, the acquisition device 130 is a differential 24-bit delta-sigma ADC.

[0118] Because electrocardiogram (ECG) signals have relatively small amplitudes, typically ranging from 0.1 to 2 millivolts, ECG measurement circuits require specific techniques to accurately detect and process these weak signals. This invention employs a 24-bit differential analog-to-digital converter (ADC) for ECG signal acquisition and measurement.

[0119] The filtered signal is then fed into a differential 24-bit delta-sigma ADC, of ​​which there are many options, such as the SGM52461SX.

[0120] Figure 5 A second schematic diagram of an embodiment of the electrocardiogram monitoring device provided by this utility model is shown below. Figure 5 As shown, this utility model uses discrete circuits to realize the automatic switching of the driving leads in the 5-lead and 3-lead modes of ECG monitoring.

[0121] The advantages of discrete circuit construction are as follows: (1) Different discrete components with different prices and performance can be selected according to actual needs to build an electrocardiogram monitoring system, thereby achieving cost optimization; (2) At the same time, discrete circuits can be customized according to specific application needs, and functional expansion is more convenient.

[0122] This invention provides a solution for building a monitoring ECG acquisition circuit using discrete components, supporting both 5-lead and 3-lead ECG acquisition. It also provides a solution for building a 3-lead automatic switching drive lead using discrete components. The MCU automatically configures the on / off state of the corresponding channel using analog switches based on the user-selected display waveform, achieving automatic switching between acquisition and drive leads. Furthermore, this invention employs a front-end signal processing circuit to optimize anti-electrosurgical interference design. Since the electrosurgical frequency is generally above 200kHz, different cutoff frequency filters are used before and after the electrosurgical signal. The cutoff frequency before the electrosurgical signal is high (e.g., 160kHz) to ensure that the input impedance is not affected, performing primary filtering on the electrosurgical signal. The cutoff frequency after the electrosurgical signal is low (e.g., 10kHz) to significantly attenuate electrosurgical interference and ensure ECG signal quality.

[0123] The electrocardiogram monitoring device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An electrocardiogram (ECG) monitoring device, characterized in that, include: Front-end signal processing circuit, drive signal processing circuit, and data acquisition unit; The output terminal of the front-end signal processing circuit is connected to the drive signal processing circuit and the data acquisition unit, respectively. The output terminal of the drive signal processing circuit is connected to the input terminal of the front-end signal processing circuit; The front-end signal processing circuit is used to filter the input lead signal to obtain the filtered lead signal; the lead signal includes a 3-lead signal or a 5-lead signal. The drive signal processing circuit is used to select a drive signal from the filtered lead signal based on the waveform to be displayed, and to select a drive lead from the leads; the drive lead and the drive signal are used to eliminate common-mode interference signals; The acquisition device is used to acquire lead signals after common-mode interference signals have been eliminated, and generate electrocardiogram waveforms.

2. The electrocardiogram monitoring device according to claim 1, characterized in that, The drive signal processing circuit includes: First analog switch, adder, driver amplifier, and second analog switch; The first analog switch, the adder, the driver amplifier, and the second analog switch are connected in sequence; The first analog switch is used to select a common-mode drive signal in the filtered lead signal based on the waveform to be displayed; The adder is used to perform addition operations on the common-mode drive signal to obtain the addition result; The driving amplifier is used to amplify the result of the addition operation to obtain the driving signal; The second analog switch is used to select the drive lead based on the waveform to be displayed.

3. The electrocardiogram monitoring device according to claim 2, characterized in that, The first analog switch is a three-channel single-pole single-throw analog switch; Each channel of the three-channel single-pole single-throw analog switch corresponds to the LA signal, RA signal, and LL signal, respectively.

4. The electrocardiogram monitoring device according to claim 3, characterized in that, The second analog switch is a four-channel single-pole single-throw analog switch; Each channel of the four-channel single-pole single-throw analog switch corresponds to lead RL, lead LL, lead LA, and lead RA, respectively.

5. The electrocardiogram monitoring device according to claim 4, characterized in that, When the lead signal is a 5-lead signal and the waveform to be displayed is a lead I waveform, a lead II waveform, and a lead III waveform, the first analog switch is used to select the LA signal, the RA signal, and the LL signal as common-mode drive signals, and the second analog switch is used to select the RL lead as the drive lead.

6. The electrocardiogram monitoring device according to claim 4, characterized in that, When the lead signal is a 3-lead signal and the waveform to be displayed is a 1-lead waveform, the first analog switch is used to select the LA signal and the RA signal as common-mode drive signals, and the second analog switch is used to select the LL lead as the drive lead; When the lead signal is a 3-lead signal and the waveform to be displayed is a II-lead waveform, the first analog switch is used to select the RA and LL signals as common-mode drive signals, and the second analog switch is used to select the LA lead as the drive lead. When the lead signal is a 3-lead signal and the waveform to be displayed is a III-lead waveform, the first analog switch is used to select the LA and LL signals as common-mode drive signals, and the second analog switch is used to select the RA lead as the drive lead.

7. The electrocardiogram monitoring device according to claim 1, characterized in that, The front-end signal processing circuit includes: First RC filter circuit, follower isolation circuit, and second RC filter circuit; The first RC filter circuit, the follower isolation circuit, and the second RC filter circuit are connected in sequence; The filter cutoff frequency of the first RC filter circuit is higher than that of the second RC filter circuit.

8. The electrocardiogram monitoring device according to claim 7, characterized in that, The front-end signal processing circuit also includes: Gas discharge tubes, TVS diodes, and clamping diodes; The gas discharge tube, the TVS tube, and the clamping diode are connected in parallel with the first RC filter circuit.

9. The electrocardiogram monitoring device according to claim 1, characterized in that, The acquisition device is specifically used to perform differential calculations based on the lead signals after eliminating common-mode interference signals to generate the electrocardiogram waveform.

10. The electrocardiogram monitoring device according to claim 1, characterized in that, The acquisition device is a differential 24-bit delta-sigma ADC.

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