CN114587394A - A postpartum uterine contraction pressure monitoring device - Google Patents

Abstract

The invention provides a postpartum uterine contraction pressure monitoring device which comprises a belly band, wherein a postpartum monitoring module for monitoring postpartum uterine states is arranged on the belly band, the postpartum monitoring module also comprises a cloud server, monitored monitoring data are sent to the cloud server by the postpartum monitoring module, and the cloud server analyzes the monitoring data to obtain an analysis result after receiving the monitoring data sent by the postpartum monitoring module. The invention can realize remote monitoring of postpartum women without being limited to use in hospitals.

Description

A postpartum uterine contraction pressure monitoring device

technical field

The invention relates to the technical field of monitoring, in particular to a postpartum uterine contraction pressure monitoring device.

Background technique

Uterine contractions are the result of action potentials propagating along uterine muscle cells in intermittent burst waves, and the Electrohysterogram (EHG) signal is the overall performance of numerous uterine smooth muscle electrical activities. Patent Application No. 2021111675960, titled "Method for Identifying Uterine Contraction Conduction Direction and Pacing Zone Based on Uterine EMG Signal", discloses collecting uterine EMG signals for a certain period of time; preprocessing uterine EMG signals; determining burst peak value Position, according to the peak position of the burst wave, intercept the contraction segment with time t before and after the peak of the burst wave; calculate the information transfer parameters between channels, including the Granger causality; determine the priority information flow direction between signals; count pregnant women All conduction directions of uterine contractions and longitudinal conduction directions of uterine contractions, and the direction with the most occurrences in all conduction directions is considered as the conduction direction of uterine contractions of the pregnant woman; the uterine contractions pacing area is determined. The invention provides a method for identifying uterine contraction conduction direction and pacing area by utilizing uterine myoelectric signals, reveals the uterine contraction conduction direction and uterine contraction source, and provides a new method for studying the uterine contraction conduction direction and uterine contraction origin.

SUMMARY OF THE INVENTION

The present invention aims to at least solve the technical problems existing in the prior art, and particularly innovatively proposes a postpartum uterine contraction pressure monitoring device.

In order to achieve the above object of the present invention, the present invention provides a postpartum uterine contraction pressure monitoring device, which is characterized in that it includes a girdle, and a postpartum monitoring module for monitoring the state of the postpartum uterus is provided on the girdle,

It also includes a cloud server. The postpartum monitoring module sends the monitored monitoring data to the cloud server. After the cloud server receives the monitoring data sent by the postpartum monitoring module, the cloud server analyzes and obtains the analysis results.

In a preferred embodiment of the present invention, the postpartum monitoring module includes a flexible PCB circuit board, and a detection patch, a controller and a wireless transceiver module are arranged on the flexible PCB circuit board, and the monitoring data output end of the detection patch is connected to the controller. The monitoring data input end of the controller is connected, and the wireless data transceiver data end of the controller is connected with the data transceiver end of the wireless transceiver module.

In a preferred embodiment of the present invention, the wireless transceiver module includes one or any combination of a Bluetooth wireless module, a 4G wireless module, and a WiFi wireless module;

When the wireless transceiver module is a Bluetooth wireless module, the wireless data transceiver Bluetooth end of the controller is connected to the data transceiver Bluetooth end of the wireless transceiver module;

When the wireless transceiver module is a 4G wireless module, the wireless data transceiver data 4G end of the controller is connected to the data transceiver 4G end of the wireless transceiver module;

When the wireless transceiver module is a WiFi wireless module, the wireless data transceiver data WiFi end of the controller is connected to the data transceiver WiFi end of the wireless transceiver module;

Or/and the detection patch includes a signal detection unit, a signal safety protection unit and a signal amplification unit;

The output first end of the signal detection unit is connected with the input first end of the signal safety protection unit, the output second end of the signal detection unit is connected with the input second end of the signal safety protection unit, and the output first end of the signal safety protection unit is connected with the input second end of the signal safety protection unit. The first input end of the signal amplifying unit is connected, the second output end of the signal safety protection unit is connected with the second input end of the signal amplifying unit, and the output end of the signal amplifying unit is connected with the monitoring data input end of the controller.

In a preferred embodiment of the present invention, the signal detection unit includes: the first end of the resistor R10 is connected to the power source VCC, the first end of the resistor R11 is connected to the power source VCC, the second end of the resistor R10 is connected to the first end of the detection resistor R9 One end is connected, the second end of the resistor R11 is connected to the first end of the adjustable resistor Rt3 and the adjustment end of the adjustable resistor Rt3 respectively, the second end of the detection resistor R9 is connected to the power ground, and the second end of the adjustable resistor Rt3 Connected to the power supply ground, the second end of the resistor R10 is connected to the input first end of the signal safety protection unit, and the second end of the resistor R11 is connected to the input second end of the signal safety protection unit;

Or/and the signal safety protection unit includes: the first end of the adjustable resistor Rt2 is connected to the first end of the resistor R8, the first end of the resistor R8 is connected to the input first end of the signal safety protection unit, and the first end of the resistor R7 It is connected to the first end of the resistor R6, the first end of the resistor R6 is connected to the input second end of the signal safety protection unit, the second end of the adjustable resistor Rt2 and the adjustment end of the adjustable resistor Rt2 are respectively connected with the second end of the resistor R7. The second end of the resistor R7 is connected to the output first end of the signal safety protection unit, the second end of the resistor R8 is connected to the second end of the resistor R6, and the second end of the resistor R6 is connected to the output first end of the signal safety protection unit. connected at both ends;

Or/and the signal amplifying unit includes: the non-inverting input end of the amplifier U2 is connected to the output first end of the signal safety protection unit, the inverting input end of the amplifier U2 is connected to the first end of the resistor R4, and the first end of the resistor R4 is connected to the first end of the resistor R4. The first end of the adjustable resistor Rt1 is connected, the second end of the resistor R4 is connected to the first end of the resistor R3, the first end of the resistor R3 is connected to the output end of the amplifier U2, and the non-inverting input end of the amplifier U3 is connected to the signal safety protection The output second end of the unit is connected, the inverting input end of the amplifier U3 is connected with the first end of the resistor R5, and the first end of the resistor R5 is respectively connected with the second end of the adjustable resistor Rt1 and the adjustment end of the adjustable resistor Rt1, The second end of the resistor R5 is connected to the first end of the resistor R2, the first end of the resistor R2 is connected to the output end of the amplifier U3, the second end of the resistor R3 is connected to the first end of the resistor R12, and the second end of the resistor R12 Connected to the power supply ground, the first end of the resistor R12 is connected to the inverting input end of the amplifier U1, the second end of the resistor R2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the output end of the amplifier U1, The second end of the resistor R2 is connected to the non-inverting input end of the amplifier U1, and the data output end OUT of the amplifier U1 is connected to the monitoring data input end of the controller.

In a preferred embodiment of the present invention, the girdle belt includes a girdle monitoring belt, the postpartum monitoring module is arranged in the girdle monitoring belt, a left extension belt is provided on the left side of the abdominal girdle monitoring belt, and the other side of the left extension belt is provided. One end is provided with a female end of the buckle, a right extension band is arranged on the right side of the corset monitoring belt, and the other end of the right extension band is provided with a male end of the buckle, and the male end of the buckle is connected with the female end of the buckle. The connection enables the girdle to wrap around the abdomen.

In a preferred embodiment of the present invention, it further comprises a left buckle arranged on the left extension belt for extending or shortening the length of the left extension belt or/and a left buckle arranged on the right extension belt for extending or shortening the right extension Right snap with length.

The invention also discloses a postpartum uterine contraction pressure monitoring working method, comprising the following steps:

S1, the postpartum monitoring module detects and obtains monitoring data within a period of time;

S2, transmitting the monitoring data obtained by the detection in step S1 to the cloud server;

S3, the cloud server analyzes the monitoring data sent in step S2 to obtain the analysis result.

In a preferred embodiment of the present invention, the monitoring method for the monitoring data obtained by the postpartum monitoring module at a certain moment in step S1 includes the following steps:

S11, acquiring the voltage signal output by the output first end of the signal detection unit and the output second end of the signal detection unit;

S12, according to the voltage signals output by the output first end of the signal detection unit and the output second end of the signal detection unit obtained in step S11, obtain the output of the first output end of the signal safety protection unit and the output second end of the signal safety protection unit. voltage signal;

S13: Obtain the voltage signal output by the output end of the signal amplifying unit according to the voltage signals output by the first output end of the signal safety protection unit and the output second end of the signal safety protection unit obtained in step S12.

To sum up, due to the adoption of the above technical solutions, the present invention can realize remote monitoring of postpartum women, and does not need to be limited to use in hospitals.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of the circuit connection of the present invention.

FIG. 2 is a schematic structural diagram of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

The present invention provides a postpartum uterine contraction pressure monitoring device, which is characterized in that, as shown in Figures 1 and 2, it includes a girdle, and a postpartum monitoring module 4 for monitoring the state of the postpartum uterus is provided on the girdle,

It also includes a cloud server. The postpartum monitoring module 4 sends the monitored monitoring data to the cloud server. After the cloud server receives the monitoring data sent by the postpartum monitoring module 4, the cloud server analyzes and obtains an analysis result.

In a preferred embodiment of the present invention, the postpartum monitoring module 4 includes a flexible PCB circuit board, and a detection patch, a controller and a wireless transceiver module are arranged on the flexible PCB circuit board, and the monitoring data output end of the detection patch is connected to the control The monitoring data input end of the controller is connected, and the wireless data transceiver data end of the controller is connected with the data transceiver end of the wireless transceiver module.

In a preferred embodiment of the present invention, the wireless transceiver module includes one or any combination of a Bluetooth wireless module, a 4G wireless module, and a WiFi wireless module;

When the wireless transceiver module is a Bluetooth wireless module, the wireless data transceiver Bluetooth end of the controller is connected to the data transceiver Bluetooth end of the wireless transceiver module;

When the wireless transceiver module is a 4G wireless module, the wireless data transceiver data 4G end of the controller is connected to the data transceiver 4G end of the wireless transceiver module;

When the wireless transceiver module is a WiFi wireless module, the wireless data transceiver data WiFi end of the controller is connected to the data transceiver WiFi end of the wireless transceiver module;

Or/and the detection patch includes a signal detection unit, a signal safety protection unit and a signal amplification unit;

The output first end of the signal detection unit is connected with the input first end of the signal safety protection unit, the output second end of the signal detection unit is connected with the input second end of the signal safety protection unit, and the output first end of the signal safety protection unit is connected with the input second end of the signal safety protection unit. The first input end of the signal amplifying unit is connected, the second output end of the signal safety protection unit is connected with the second input end of the signal amplifying unit, and the output end of the signal amplifying unit is connected with the monitoring data input end of the controller.

In a preferred embodiment of the present invention, the signal detection unit includes: the first end of the resistor R10 is connected to the power source VCC, the first end of the resistor R11 is connected to the power source VCC, the second end of the resistor R10 is connected to the first end of the detection resistor R9 One end is connected, the second end of the resistor R11 is connected to the first end of the adjustable resistor Rt3 and the adjustment end of the adjustable resistor Rt3 respectively, the second end of the detection resistor R9 is connected to the power ground, and the second end of the adjustable resistor Rt3 Connected to the power supply ground, the second end of the resistor R10 is connected to the input first end of the signal safety protection unit, and the second end of the resistor R11 is connected to the input second end of the signal safety protection unit;

Or/and the signal safety protection unit includes: the first end of the adjustable resistor Rt2 is connected to the first end of the resistor R8, the first end of the resistor R8 is connected to the input first end of the signal safety protection unit, and the first end of the resistor R7 It is connected to the first end of the resistor R6, the first end of the resistor R6 is connected to the input second end of the signal safety protection unit, the second end of the adjustable resistor Rt2 and the adjustment end of the adjustable resistor Rt2 are respectively connected with the second end of the resistor R7. The second end of the resistor R7 is connected to the output first end of the signal safety protection unit, the second end of the resistor R8 is connected to the second end of the resistor R6, and the second end of the resistor R6 is connected to the output first end of the signal safety protection unit. connected at both ends;

Or/and the signal amplifying unit includes: the non-inverting input end of the amplifier U2 is connected to the output first end of the signal safety protection unit, the inverting input end of the amplifier U2 is connected to the first end of the resistor R4, and the first end of the resistor R4 is connected to the first end of the resistor R4. The first end of the adjustable resistor Rt1 is connected, the second end of the resistor R4 is connected to the first end of the resistor R3, the first end of the resistor R3 is connected to the output end of the amplifier U2, and the non-inverting input end of the amplifier U3 is connected to the signal safety protection The output second end of the unit is connected, the inverting input end of the amplifier U3 is connected with the first end of the resistor R5, and the first end of the resistor R5 is respectively connected with the second end of the adjustable resistor Rt1 and the adjustment end of the adjustable resistor Rt1, The second end of the resistor R5 is connected to the first end of the resistor R2, the first end of the resistor R2 is connected to the output end of the amplifier U3, the second end of the resistor R3 is connected to the first end of the resistor R12, and the second end of the resistor R12 Connected to the power supply ground, the first end of the resistor R12 is connected to the inverting input end of the amplifier U1, the second end of the resistor R2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the output end of the amplifier U1, The second end of the resistor R2 is connected to the non-inverting input end of the amplifier U1, and the data output end OUT of the amplifier U1 is connected to the monitoring data input end of the controller.

In a preferred embodiment of the present invention, the girdle belt includes a girdle monitoring belt 5, the postpartum monitoring module 4 is disposed in the girdle monitoring belt 5, and a left extension belt 3 is disposed on the left side of the abdominal girdle monitoring belt 5, The other end of the left extension belt 3 is provided with the female end 1 of the buckle, the right extension belt 7 is arranged on the right side of the corset monitoring belt 5, and the other end of the right extension belt 7 is provided with the male end 8 of the buckle. The male end 8 of the buckle is connected with the female end 1 of the buckle so that the belly belt is wrapped around the abdomen.

In a preferred embodiment of the present invention, it further includes a left buckle 2 arranged on the left extension band 3 for extending or shortening the length of the left extension band 3 or/and a left buckle 2 arranged on the right extension band 7 for elongation Or shorten the length of the right buckle 6 of the right extension belt 7.

The invention also discloses a postpartum uterine contraction pressure monitoring working method, comprising the following steps:

S1, the postpartum monitoring module 4 detects and obtains monitoring data within a period of time;

S2, transmitting the monitoring data obtained by the detection in step S1 to the cloud server;

S3, the cloud server analyzes the monitoring data sent in step S2 to obtain the analysis result.

In a preferred embodiment of the present invention, the monitoring method for the monitoring data acquired by the postpartum monitoring module 4 at a certain moment in step S1 includes the following steps:

S11, obtain the voltage signal output by the output first end of the signal detection unit and the output second end of the signal detection unit, and the calculation method of the voltage signal output by the output first end of the signal detection unit is:

Among them, V _CC represents the power supply VCC;

R ₉ represents the resistance value of the detection resistor R9;

R10 represents the resistance value of resistor R10 _;

u ₁ represents the voltage signal output by the output first end of the signal detection unit;

The calculation method of the voltage signal output by the second output terminal of the signal detection unit is:

Among them, V _CC represents the power supply VCC;

_R11 represents the resistance value of the resistor R11;

R _t3 represents the resistance value of the resistor Rt3;

u ₂ represents the voltage signal output by the output second end of the signal detection unit;

S12, according to the voltage signals output by the output first end of the signal detection unit and the output second end of the signal detection unit obtained in step S11, obtain the output of the first output end of the signal safety protection unit and the output second end of the signal safety protection unit. Voltage signal, the calculation method of the voltage signal output by the first output terminal of the signal safety protection unit is:

Wherein, u ₁ represents the voltage signal output by the output first end of the signal detection unit;

u ₂ represents the voltage signal output by the output second end of the signal detection unit;

_R7 represents the resistance value of resistor R7;

R _t2 represents the resistance value of the resistor Rt2;

u ₁ ′ represents the voltage signal output by the first output terminal of the signal safety protection unit;

Wherein, u ₁ represents the voltage signal output by the output first end of the signal detection unit;

u ₂ represents the voltage signal output by the output second end of the signal detection unit;

R6 represents the resistance value of resistor R6 _;

_R8 represents the resistance value of resistor R8;

u ₂ ′ represents the voltage signal output by the second output terminal of the signal safety protection unit;

S13, the voltage signal output by the output end of the signal amplifying unit is obtained according to the voltage signal output by the output first end of the signal safety protection unit and the output second end of the signal safety protection unit obtained in step S12, and the output end of the signal amplifying unit outputs The calculation method of the voltage signal is:

Wherein, u ₁ ′ represents the voltage signal output by the output first end of the signal safety protection unit;

u ₂ ′ represents the voltage signal output by the second output terminal of the signal safety protection unit;

R1 represents the resistance value _of resistor R1;

R2 represents the resistance value of resistor R2 _;

R _t1 represents the resistance value of the resistor Rt1;

u _o represents the voltage signal output by the output terminal of the signal amplifying unit.

In a preferred embodiment of the present invention, the following steps are included in step S2:

S21, performing data compression on the monitoring data obtained by the detection in step S1 to obtain the transmission package to be uploaded;

S22, processing the to-be-uploaded sending package obtained in step S21 to obtain the uploading sending code, and the calculation method of the uploading sending code is:

upload sending number=Upload and send code method(uploaded package),

Among them, upload sending number means upload sending code;

Upload and send code method() indicates the hash method using SHA-1;

uploaded package indicates the package to be uploaded and sent;

S23: Send the to-be-uploaded sending package obtained in step S21 and the uploading sending code obtained in step S22 to the cloud server.

In a preferred embodiment of the present invention, the following steps are included in step S3:

S31, after the cloud server receives the sending packet to be uploaded and the sending code sent by the postpartum monitoring module 4, the cloud server processes the received sending packet to be uploaded sent by the postpartum monitoring module 4, and obtains the receiving code on the cloud, which is received by the cloud The code is calculated as:

upload sending number'=Upload and send code method(uploadedpackage'),

Among them, upload sending number' represents the cloud receiving code;

Upload and send code method() indicates the hash method using SHA-1;

uploaded package' represents the sending package to be uploaded and sent by the postpartum monitoring module 4 received by the cloud server;

S32, the cloud server judges whether the cloud receiving code upload sending number' is consistent with the upload sending number received by the cloud server and sent by the postpartum monitoring module 4:

If the cloud receiving code upload sending number' is consistent with the upload sending number sent by the cloud server after receiving the postpartum monitoring module 4, then execute the next step;

If the cloud receiving code upload sending number' is inconsistent with the upload sending code received by the cloud server and sent by the postpartum monitoring module 4, the postpartum monitoring module 4 is re-requested to send monitoring data, and the process returns to step S2;

S33, the cloud server decompresses the to-be-uploaded sending packet sent by the postpartum monitoring module 4 to obtain its cloud monitoring data, and calculates its analysis result according to the cloud monitoring data, and the calculation method for the analysis result includes the following steps:

S331, arranging the values in the cloud monitoring data in ascending order;

S332, calculate the pressure value detected by the postpartum monitoring module 4, and the calculation method of the pressure value detected by the postpartum monitoring module 4 is:

Among them, N represents the total number of data in the cloud monitoring data; N is a positive integer greater than or equal to 1;

{Even} ⁺ indicates the set of positive even numbers;

{Odd} ⁺ indicates the set of positive odd numbers;

P _N/2 means the value in the N/2th position after the values in the cloud monitoring data are arranged in ascending order;

P _N/2+1 represents the value in the N/2+1th position after the values in the cloud monitoring data are arranged in ascending order;

P _(N+1)/2 represents the value in the (N+1)/2th position after the values in the cloud monitoring data are arranged in ascending order;

λ represents the error coefficient, λ∈(0,0.056];

τ represents the conversion coefficient of pressure and resistance;

P represents the pressure value detected by the postpartum monitoring module 4;

S333, determine whether the calculated pressure value is consistent with the preset pressure threshold range:

If the calculated pressure value is within the preset pressure threshold range, it is normal;

If the calculated pressure value is not within the preset pressure threshold range, it is abnormal; the normal and abnormal results are the analysis results;

S34, send the analysis result to the user.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (8)

1. a postpartum uterine contraction pressure monitoring device, is characterized in that, comprises a girdle, is provided with a postpartum monitoring module (4) for monitoring postpartum uterine state on the girdle, It also includes a cloud server, the postpartum monitoring module (4) sends the monitored monitoring data to the cloud server, and after the cloud server receives the monitoring data sent by the postpartum monitoring module (4), the cloud server analyzes and obtains an analysis result. 2. The postpartum uterine contraction pressure monitoring device according to claim 1, wherein the postpartum monitoring module (4) comprises a flexible PCB circuit board, and is provided with a detection patch, a controller and a wireless transceiver module on the flexible PCB circuit board The monitoring data output end of the detection patch is connected with the monitoring data input end of the controller, and the wireless data transceiver data end of the controller is connected with the data transceiver end of the wireless transceiver module. 3. The postpartum uterine contraction pressure monitoring device according to claim 2, wherein the wireless transceiver module comprises one of a Bluetooth wireless module, a 4G wireless module, and a WiFi wireless module or any combination thereof; When the wireless transceiver module is a Bluetooth wireless module, the wireless data transceiver Bluetooth end of the controller is connected to the data transceiver Bluetooth end of the wireless transceiver module; When the wireless transceiver module is a 4G wireless module, the wireless data transceiver data 4G end of the controller is connected to the data transceiver 4G end of the wireless transceiver module; When the wireless transceiver module is a WiFi wireless module, the wireless data transceiver data WiFi end of the controller is connected to the data transceiver WiFi end of the wireless transceiver module. 4. The postpartum uterine contraction pressure monitoring device according to claim 2, wherein the detection patch comprises a signal detection unit, a signal safety protection unit and a signal amplification unit; The output first end of the signal detection unit is connected with the input first end of the signal safety protection unit, the output second end of the signal detection unit is connected with the input second end of the signal safety protection unit, and the output first end of the signal safety protection unit is connected with the input second end of the signal safety protection unit. The first input end of the signal amplifying unit is connected, the second output end of the signal safety protection unit is connected with the second input end of the signal amplifying unit, and the output end of the signal amplifying unit is connected with the monitoring data input end of the controller. 5. The postpartum uterine contraction pressure monitoring device according to claim 1, wherein the girdle belt comprises an abdominal girdle monitoring belt (5), and the postpartum monitoring module (4) is arranged in the abdominal girdle monitoring belt (5), and A left extension belt (3) is provided on the left side of the abdominal coring monitoring belt (5), and a female end (1) of a buckle is disposed on the other end of the left extending belt (3), and is provided on the right side of the abdominal coring monitoring belt (5). A right extension band (7) is provided, and the other end of the right extension band (7) is provided with a male end (8) of the buckle, which is realized by connecting the male end (8) of the buckle with the female end (1) of the buckle The girdle wraps around the abdomen. 6. The postpartum uterine contraction pressure monitoring device according to claim 5, further comprising a left buckle (2) arranged on the left extension belt (3) for extending or shortening the length of the left extension belt (3). ) or/and a right buckle (6) provided on the right extension belt (7) for extending or shortening the length of the right extension belt (7). 7. a postpartum uterine contraction pressure monitoring working method, is characterized in that, comprises the following steps: S1, the postpartum monitoring module (4) detects and obtains monitoring data within a period of time; S2, transmitting the monitoring data obtained by the detection in step S1 to the cloud server; S3, the cloud server analyzes the monitoring data sent in step S2 to obtain the analysis result. 8. postpartum uterine contraction pressure monitoring working method according to claim 7, is characterized in that, the monitoring method of the monitoring data that postpartum monitoring module (4) obtains at a certain moment in step S1 comprises the following steps: S11, acquiring the voltage signal output by the output first end of the signal detection unit and the output second end of the signal detection unit; S12, according to the voltage signals output by the output first end of the signal detection unit and the output second end of the signal detection unit obtained in step S11, obtain the output of the first output end of the signal safety protection unit and the output second end of the signal safety protection unit. voltage signal; S13: Obtain the voltage signal output by the output end of the signal amplifying unit according to the voltage signals output by the first output end of the signal safety protection unit and the output second end of the signal safety protection unit obtained in step S12.

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