Physiological signal switching module and electronic equipment

Abstract

The embodiment of the utility model provides a physiological signal switching module and electronic equipment, and relates to the technical field of signal switching. The physiological signal switching module comprises a resistance network module and a control module. The resistor network module comprises a plurality of resistor units which are connected end to end, and each resistor unit is connected with one switch in parallel; the control module can receive signals of different temperature sensors, and then the control module outputs a control signal to adjust the resistance network module, so that the resistance network module forms a resistance value adapted to the monitor. Resistance values of different thermistors at specific temperatures can be converted into resistance values suitable for the monitor, so that a plurality of temperature sensors can be matched with a plurality of monitors for use.

Description

Technical Field

[0001] The present application relates to the technical field of signal switching, and in particular to a physiological signal switching module and an electronic device. Background Art

[0002] Monitors are used to monitor blood pressure or body temperature and need to be equipped with pressure sensors or temperature sensors.

[0003] However, a monitor often needs to be used with a specific temperature sensor, and when a temperature sensor is changed, signal incompatibility may occur. In addition, a temperature sensor can often only be used for a specific monitor, and when it is changed to another monitor, signal incompatibility may occur.

[0004] How to realize the matching use of multiple temperature sensors with multiple monitors is the technical problem to be solved by this application. Utility Model Content

[0005] The purpose of the present application is to provide a physiological signal adapter module and an electronic device to enable a variety of temperature sensors to be used in conjunction with a variety of monitors.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions.

[0007] In a first aspect, an embodiment of the present application provides a physiological signal adapter module, including a resistor network module and a control module;

[0008] The resistor network module includes a plurality of resistor units connected end to end, each resistor unit is connected in parallel with a switch; the control end of each switch is connected to the control module;

[0009] The first receiving end of the control module is used to receive an external temperature sensor signal;

[0010] The resistor network module is used to form different overall resistance values ​​under the switch control signal of the control module, so that the monitor can correctly identify the temperature through the overall resistance value.

[0011] Optionally, the physiological signal adapter module further includes a constant current source module;

[0012] The constant current source module is connected to a first end of the resistor network module, and a second end of the resistor network module is grounded;

[0013] The constant current source module is used to convert the overall resistance value of the resistor network module into a voltage signal.

[0014] Optionally, the physiological signal adapter module further includes an analog-to-digital conversion module;

[0015] The input end of the analog-to-digital conversion module is connected to the first end of the resistor network module, and the output end of the analog-to-digital conversion module is connected to the second receiving end of the control module.

[0016] Optionally, the physiological signal transfer module further includes a first differential analog switch module, an operational amplifier, a first precision resistor, a second precision resistor and a third precision resistor;

[0017] The first group of input terminals of the first differential analog switch module is connected to the first terminal of the resistor network module, and the second terminal of the resistor network module is grounded;

[0018] The second group of input terminals of the first differential analog switch module is connected to the first terminal of the first precision resistor, and the second terminal of the first precision resistor is grounded;

[0019] The third group of input terminals of the first differential analog switch module is connected to the first terminal of the second precision resistor, and the second terminal of the second precision resistor is grounded;

[0020] The fourth group of input terminals of the first differential analog switch module is connected to the first terminal of the third precision resistor, and the second terminal of the third precision resistor is grounded;

[0021] The first output end of the first differential analog switch module is connected to the constant current source module, and the second output end of the first differential analog switch module is connected to the input end of the operational amplifier;

[0022] The output end of the operational amplifier is connected to the input end of the analog-to-digital conversion module.

[0023] Optionally, the resistor units in the resistor network module are divided into at least two groups, the resistance values ​​of the resistor units in any one group are the same, and the resistance values ​​of the resistor units in different groups are different.

[0024] Optionally, the physiological signal adapter module further includes a pressure signal calibration module;

[0025] The input end of the pressure signal calibration module is used to receive an external pressure sensor signal;

[0026] The output end of the pressure signal calibration module is connected to the control module.

[0027] Optionally, the pressure signal calibration module includes a second differential analog switch module, a pressure signal operational amplifier, a first pressure value calibration module and a second pressure value calibration module;

[0028] The output end of the first pressure value calibration module is used to generate a first pressure value signal;

[0029] The output end of the second pressure value calibration module is used to generate a second pressure value signal;

[0030] The pressure values ​​represented by the first pressure value signal and the second pressure value signal are different;

[0031] The first pressure value calibration module is connected to the first group of input ends of the second differential analog switch module, the second pressure value calibration module is connected to the second group of input ends of the second differential analog switch module, and the output end of the second differential analog switch module is connected to the control module through the pressure signal amplifier.

[0032] Optionally, the physiological signal switching module further includes an analog-to-digital conversion module and a digital-to-analog conversion module;

[0033] The third group of input terminals of the second differential analog switch module is connected to the output terminal of the digital-to-analog conversion module;

[0034] The input end of the digital-to-analog conversion module is connected to the control module; the output end of the digital-to-analog conversion module is used to connect to the monitor;

[0035] The output end of the second differential analog switch module is connected to the input end of the pressure signal amplifier, the output end of the pressure signal amplifier is connected to the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected to the control module.

[0036] Optionally, the physiological signal switching module further includes a third differential analog switch module;

[0037] The first group of input terminals of the third differential analog switch module is used to receive the external pressure sensor signal;

[0038] The second group of input terminals of the third differential analog switch module is connected to the output terminal of the digital-to-analog conversion module;

[0039] The output end of the third differential analog switch module is used to connect to the monitor.

[0040] In a second aspect, an embodiment of the present application provides an electronic device, which includes the physiological signal conversion module of the first aspect.

[0041] Compared with the prior art, this application has the following beneficial effects:

[0042] Different temperature sensors have different thermistors. Although a monitor can only receive signals generated by a specific thermistor, the control module of the physiological signal adapter module provided in the embodiment of the present application can receive signals from different temperature sensors. The control module then outputs a control signal to adjust the resistor network module so that the resistor network module forms a resistance value suitable for the monitor. The resistance of different thermistors at a specific temperature can be converted into a resistance value suitable for the monitor, which means that multiple temperature sensors can be used in conjunction with multiple monitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of a physiological signal transfer module provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of a resistor network module provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of a resistor network module having four groups of resistor units provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of a physiological signal transfer module with a constant current source module provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of a physiological signal adapter module having an analog-to-digital conversion module provided in an embodiment of the present application;

[0049] Figure 6 A schematic diagram of a physiological signal adapter module with precision resistors provided in an embodiment of the present application;

[0050] Figure 7 for Figure 6 The connection diagram of the precision resistor and analog switch is shown;

[0051] Figure 8 A schematic diagram of a physiological signal adapter module with a pressure signal calibration function provided in an embodiment of the present application;

[0052] Fig. 9 A schematic diagram of a physiological signal adapter module having two pressure signal calibration modules provided in an embodiment of the present application;

[0053] Fig.10 A schematic diagram of a physiological signal adapter module with temperature signal and pressure signal calibration provided in an embodiment of the present application;

[0054] Fig.11 A schematic diagram of a physiological signal adapter module with three analog switches provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described in the drawings here can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0057] In the description of this application, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium.

[0058] See also Figure 1 The embodiment of the present application provides a physiological signal transfer module, which includes a resistor network module and a control module. The first receiving end of the control module is used to receive an external temperature sensor signal, and the temperature sensor can be a thermistor.

[0059] like Figure 2 The resistor network module includes a plurality of resistor units connected end to end, each resistor unit is connected in parallel with a switch, and a control end of each switch is connected to the control module.

[0060] The switch can be a transistor with a switching function, with the gate or base as the control terminal, and is turned on or off according to the signal of the gate or base. When a switch is turned on, it means that a resistor unit connected in parallel with the switch is short-circuited, thereby affecting the resistance at both ends of the entire resistor network module. When all switches are turned on, the resistance of the entire resistor network module is approximately 0, and when all switches are turned off, the resistance of the entire resistor network module is the maximum resistance that the resistor network module can output.

[0061] The resistor network module is used to form different overall resistance values ​​under the switch control signal of the control module, so that the monitor can correctly identify the temperature through the overall resistance value.

[0062] Different temperature sensors have different thermistors. Although a monitor can only receive signals generated by a specific thermistor, by using the control module to receive signals from different temperature sensors, and then the control module outputs a control signal to adjust the resistor network module, the resistor network module can form a resistance value suitable for the monitor. The resistance of different thermistors at a specific temperature can be converted into a resistance value suitable for the monitor, which means that multiple temperature sensors can be used in conjunction with multiple monitors.

[0063] After the temperature sensor collects the temperature signal, the control module can determine the resistance value corresponding to the temperature by looking up the table according to the model of the temperature sensor, and judge whether the corresponding resistance range is 1 to 5kΩ or 5 to 10kΩ, and then adjust the output of the resistor network module according to the corresponding relationship. For example, when a 3.5kΩ signal is collected, it is judged that the corresponding resistance range is 1 to 5kΩ, and the overall resistance value of the resistor network module is adjusted to the corresponding resistance value and output to the monitor. The monitor looks up the table according to the resistance value, confirms the temperature corresponding to the resistance value, and displays it.

[0064] The resistor units in the resistor network module are divided into at least two groups, the resistor units in any group have the same resistance value, and the resistor units in different groups have different resistance values. For example, the resistance values ​​of the resistor units in one group are all 1 ohm, and the resistance values ​​of the resistor units in another group are all 10 ohms, so that various overall resistance values ​​can be achieved through different switch combinations.

[0065] like Figure 3 , Figure 3 Four groups of resistor units are shown. The resistance value of the first group of resistor units is 1 ohm, the resistance value of the second group of resistor units is 10 ohms, the resistance value of the third group of resistor units is 100 ohms, and the resistance value of the fourth group of resistor units is 1000 ohms. Each group has the same number of 10 resistor units. In theory, the overall resistance value can be any natural value from 1 to 11110 (ohms), with high precision and easy control.

[0066] Taking the overall resistance value as 10kΩ as an example, switches S1-S10 are disconnected and switches S11-S40 are closed, which is equivalent to only 10 1000 ohm resistors connected in series, that is, the overall resistance value is set to 10kΩ. In the program of the control module, the switch disconnect state can be represented as "1" and the switch closed state can be represented as "0". The switch state code for outputting 10kΩ can be "1111111111 0000000000 0000000000 0000000000".

[0067] like Figure 4The physiological signal adapter module may include a constant current source module. The constant current source module is connected to the first end of the resistor network module, and the second end of the resistor network module is grounded; the constant current source module converts the overall resistance value of the resistor network module into a voltage signal. At this time, the two ends of the resistor network module have a voltage signal, which can be transmitted to the control module.

[0068] like Figure 5 The physiological signal adapter module may further include an analog-to-digital conversion module. The voltage signal may be converted by the analog-to-digital conversion module, converted into a digital signal and then transmitted to the control module. The input end of the analog-to-digital conversion module is connected to the first end of the resistor network module, and the output end of the analog-to-digital conversion module is connected to the second receiving end of the control module.

[0069] The control module records the corresponding relationship between the switch control signal and the overall resistance value according to the voltage signal received by the second receiving end. Figure 5 Advantageous effects of the illustrated embodiment.

[0070] refer to Figure 3 , the resistance value of the resistance unit may not be equal to the ideal value, but has a certain deviation, so the switch state code is not necessarily the theoretical value. For example, the theoretical value of the switch state code for outputting 10kΩ is "111111111100000000000 00000000000000000000", but due to the resistance value error of the resistance unit, in the case of the switch state code of the theoretical value, the analog-to-digital conversion module detects the signal and feeds it back to the control module. The control module can find that it does not meet the 10kΩ output, so the control module can gradually adjust the switch state code. For example, when the switch state code is "1111111111 00000000000 00000000000000000111", the control module finds that it meets the 10kΩ output, then the control module can record the corresponding relationship between 10kΩ and the switch state code, and when 10kΩ output is required, the switch state code is used, so that the requirement of outputting 10kΩ can be met.

[0071] In summary, when the analog-to-digital conversion module collects the signal of the resistor network module and feeds it back to the control module, it can store the correspondence between the switch state code and the actual output of the resistor network module, avoiding the influence of factors such as resistance error or local voltage error in the circuit.

[0072] The above-mentioned correspondence between the overall resistance value and the switch state code can be recorded at several typical resistance values, rather than at all resistance values. For example, the corresponding switch state code can be recorded at 1kΩ, 5kΩ, and 10kΩ. The above-mentioned control module can be an MCU, and the analog-to-digital conversion module can be sent to the MCU via SPI communication.

[0073] Reference below Figure 6 , Figure 6 In the embodiment shown, the physiological signal transfer module includes a first differential analog switch module, an operational amplifier, a first precision resistor, a second precision resistor and a third precision resistor. Figure 6 The temperature sensor may not be directly connected to the control module, but after the temperature sensor is connected in parallel with the first precision resistor, it is connected to the control module through a link formed by the first differential analog switch module, the operational amplifier, and the analog-to-digital conversion module. The parallel connection of the first precision resistor and the operational amplifier can regulate the signal of the temperature sensor so that the signal adapts to the receiving range of the control module.

[0074] refer to Figure 7 One end of the first precision resistor R68, one end of the second precision resistor R71, and one end of the third precision resistor R75 are connected to the input end of the first differential analog switch module D28, and the other end of the first precision resistor R68, the other end of the second precision resistor R71, and the other end of the third precision resistor R75 are grounded.

[0075] The resistor network module as a whole has two ends, namely RES_NET+ and RES_NET-. RES_NET- can be selected to be floating or grounded through an analog switch. When calibrating the resistor network, this analog switch is grounded (meaning RES_NET- is also grounded). RES_NET+ is connected to the input of the first differential analog switch module D28. The current source can generate a corresponding voltage (V=I*R) on this resistor network through RES_NET+ to RES_NET- (RES_NET- is grounded). The current I generated by the current source and the voltage V obtained by the analog-to-digital converter can be used to calculate the corresponding resistance R of the resistor network at this time. When the resistance of the resistor network needs to be output, the RES_NET- is selected to be floating through this analog switch. At this time, the resistor network is a resistor output to the monitor.

[0076] The X output terminal of the first differential analog switch module D28 is connected to the constant current source module CC, and the Y output terminal is connected to the input terminal T-OUT of the operational amplifier. The output terminal of the operational amplifier can output a signal representing the temperature and is connected to the analog-to-digital conversion module.

[0077] The external temperature sensor signal is Figure 7 The "TIN" in the signal can be connected in parallel with a 25kΩ precision resistor to adjust the collected resistance value to a reasonable range and finally transmit it to the control module. The other two precision resistors can be used to calibrate the constant current source module and the op amp. When powered on, the program controls the analog switch to collect the two precision resistors in turn. Because the voltage signal output by the resistor under the action of a specific constant current source module and op amp is linearly related to the resistance, two points determine a straight line, so the two resistors can determine the linear function, that is, calibrate the constant current source and the op amp.

[0078] The physiological signal transfer module with pressure signal interface and temperature signal interface can simultaneously complete the transfer of temperature signal and pressure signal to the monitor. Figure 8 The physiological signal adapter module may also include a pressure signal calibration module. The input end of the pressure signal calibration module is used to receive the external pressure sensor signal, and the output end of the pressure signal calibration module is connected to the control module. The pressure signal calibration module can process the external pressure sensor signal by means of a resistance voltage divider circuit. When the control module needs to obtain the zero point signal of the external pressure sensor, the zero point signal of the external pressure sensor is transmitted to the control module through the pressure signal calibration module.

[0079] The adapter module can read the zero point information of the external pressure sensor. When the monitor needs to calibrate the pressure signal to zero, the control module can calculate the corresponding parameters based on the zero point information of the pressure sensor and send them to the DAC. The DAC outputs a differential voltage to the monitor for zero calibration, thereby enabling the monitor to obtain the zero point voltage value of the pressure sensor in the monitoring drainage kit for re-zeroing without removing the pressure sensor from the patient's skull. Figure 8 There is a signal transmission to the monitor on the right side of the control module.

[0080] like Fig. 9 The pressure signal calibration module may include a second differential analog switch module, a pressure signal amplifier, a first pressure value calibration module and a second pressure value calibration module. The first pressure value calibration module and the second pressure value calibration module may be a resistor voltage divider circuit, which obtains the corresponding pressure value signal by the principle of resistor voltage divider; the first pressure value signal and the second pressure value signal represent different pressure values, for example, a 0mmHg signal is used as the first pressure value signal, and a 100mmHg signal is used as the second pressure value signal. Two pressure values ​​can calibrate a linear equation, that is, an equation of the relationship between the output signal of the pressure signal amplifier and the pressure signal. The pressure signal is a differential signal, for example, 0mmHg can be a voltage difference of 0mV, and 100mmHg is a voltage difference of 1mV.

[0081] After calibration, the signal of the pressure sensor is transmitted to the control module through the top one of the three inputs of the second differential analog switch module through the pressure signal amplifier.

[0082] like Fig.10 The signal output by the pressure signal amplifier can be transmitted to the control module through the analog-to-digital conversion module, and the control module can output the pressure signal and transmit it to the monitor through the digital-to-analog conversion module. The signal output by the control module can be self-checked through the digital-to-analog conversion module and the analog-to-digital conversion module to check whether the voltage value output by the digital-to-analog conversion module is consistent with the expected voltage value.

[0083] like Fig.11 The physiological signal transfer module also includes a third differential analog switch module. The input end of the third differential analog switch module can be connected to (1) the signal output by the control module after the digital-to-analog conversion module, such as the zero-point signal of the pressure sensor, which is used for the monitor to calibrate the pressure sensor, and (2) the pressure sensor signal. Then, the input end of the third differential analog switch module can switch the above different signals to be output to the monitor.

[0084] like Fig.11 Components such as voltage-dividing resistors can be added to the signal path to adjust the signal size; a voltage follower can also be added before the output to the monitor interface or after the digital-to-analog conversion module to stabilize the output of the voltage signal.

[0085] Based on the above embodiment, the embodiment of the present application further provides an electronic device, wherein the above physiological signal transfer module is installed inside the electronic device. The electronic device may include an indicator light, a button, and a display screen.

[0086] The buttons may include: a zero calibration button. Pressing the zero calibration button records the zero point voltage of the pressure sensor in the storage chip of the sensor; a sensitivity calibration button. Long pressing the sensitivity calibration button switches the output value of the adapter module (for example, 0 mmHg, 40 mmHg, 100 mHg).

[0087] Indicator lights may include:

[0088] Self-test indicator: When the adapter module fails the self-test, the self-test indicator will flash quickly;

[0089] Sensor status indicator: When the sensor is not connected, the sensor status indicator will be always on. When the sensor is connected but not zeroed, the sensor status indicator will flash quickly. When the sensor is connected and zeroed, the sensor status indicator will go out.

[0090] Output zero point indicator light: When the adapter module outputs the sensor zero point voltage, the output sensor zero point voltage value indicator light will light up;

[0091] Signal output direct connection indicator light: The analog switch directly connects the sensor signal to the input end of the monitor, and the sensor signal direct connection indicator light will light up;

[0092] Three calibration indicator lights: When the corresponding indicator lights up, the adapter module outputs the corresponding value, including 0mmHg, 40mmHg, and 100mmHg.

[0093] In general, the present application proposes a physiological signal adapter module and an electronic device. The physiological signal adapter module can be used in conjunction with multiple monitors on the market.

[0094] The above-described device and system embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. A person skilled in the art may understand and implement the present embodiment without creative effort.

[0095] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A physiological signal transfer module, characterized in that: It includes a resistor network module and a control module; The resistor network module includes a plurality of resistor units connected end to end, each resistor unit is connected in parallel with a switch; the control end of each switch is connected to the control module; The first receiving end of the control module is used to receive an external temperature sensor signal; The resistor network module is used to form different overall resistance values ​​under the switch control signal of the control module, so that the monitor can correctly identify the temperature through the overall resistance value.

2. The physiological signal adapter module according to claim 1, characterized in that: The physiological signal transfer module also includes a constant current source module; The constant current source module is connected to a first end of the resistor network module, and a second end of the resistor network module is grounded; The constant current source module is used to convert the overall resistance value of the resistor network module into a voltage signal.

3. The physiological signal adapter module according to claim 2, characterized in that: The physiological signal adapter module also includes an analog-to-digital conversion module; The input end of the analog-to-digital conversion module is connected to the first end of the resistor network module, and the output end of the analog-to-digital conversion module is connected to the second receiving end of the control module.

4. The physiological signal adapter module according to claim 3, characterized in that: The physiological signal transfer module also includes a first differential analog switch module, an operational amplifier, a first precision resistor, a second precision resistor and a third precision resistor; The first group of input terminals of the first differential analog switch module is connected to the first terminal of the resistor network module, and the second terminal of the resistor network module is grounded; The second group of input terminals of the first differential analog switch module is connected to the first terminal of the first precision resistor, and the second terminal of the first precision resistor is grounded; The third group of input terminals of the first differential analog switch module is connected to the first terminal of the second precision resistor, and the second terminal of the second precision resistor is grounded; The fourth group of input terminals of the first differential analog switch module is connected to the first terminal of the third precision resistor, and the second terminal of the third precision resistor is grounded; The first output end of the first differential analog switch module is connected to the constant current source module, and the second output end of the first differential analog switch module is connected to the input end of the operational amplifier; The output end of the operational amplifier is connected to the input end of the analog-to-digital conversion module.

5. The physiological signal adapter module according to claim 1, characterized in that: The resistor units in the resistor network module are divided into at least two groups, the resistance values ​​of the resistor units in any one group are the same, and the resistance values ​​of the resistor units in different groups are different.

6. The physiological signal adapter module according to claim 1, characterized in that: The physiological signal adapter module also includes a pressure signal calibration module; The input end of the pressure signal calibration module is used to receive an external pressure sensor signal; The output end of the pressure signal calibration module is connected to the control module.

7. The physiological signal adapter module according to claim 6, characterized in that: The pressure signal calibration module includes a second differential analog switch module, a pressure signal operational amplifier, a first pressure value calibration module and a second pressure value calibration module; The output end of the first pressure value calibration module is used to generate a first pressure value signal; The output end of the second pressure value calibration module is used to generate a second pressure value signal; The pressure values ​​represented by the first pressure value signal and the second pressure value signal are different; The first pressure value calibration module is connected to the first group of input ends of the second differential analog switch module, the second pressure value calibration module is connected to the second group of input ends of the second differential analog switch module, and the output end of the second differential analog switch module is connected to the control module through the pressure signal amplifier.

8. The physiological signal switching module according to claim 7, characterized in that: The physiological signal switching module also includes an analog-to-digital conversion module and a digital-to-analog conversion module; The third group of input terminals of the second differential analog switch module is connected to the output terminal of the digital-to-analog conversion module; The input end of the digital-to-analog conversion module is connected to the control module; the output end of the digital-to-analog conversion module is used to connect to the monitor; The output end of the second differential analog switch module is connected to the input end of the pressure signal amplifier, the output end of the pressure signal amplifier is connected to the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected to the control module.

9. The physiological signal switching module according to claim 8, characterized in that: The physiological signal transfer module further includes a third differential analog switch module; The first group of input terminals of the third differential analog switch module is used to receive the external pressure sensor signal; The second group of input terminals of the third differential analog switch module is connected to the output terminal of the digital-to-analog conversion module; The output end of the third differential analog switch module is used to connect to the monitor.

10. An electronic device, characterized in that: The electronic device comprises the physiological signal conversion module according to any one of claims 1 to 9.

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