Special water injection device and method for endoscopic surgery based on pressure monitoring and flow control

Abstract

The invention provides a water injection device and method special for endoscopic surgery based on pressure monitoring and flow control, and belongs to the technical field of medical instruments. Comprising a water injection pipeline, one end of the water injection pipeline is connected with a water injection module, the other end of the water injection pipeline is provided with a heating unit, a filtering unit, a flow control unit, a pressure monitoring unit and a waste liquid recycling unit, and the water injection pipeline is used for monitoring and controlling flow and pressure and recycling waste liquid. The other end of the water injection hose is connected with an injector. Water injection flow and pressure can be monitored and adjusted in real time, and safety in the operation process is ensured; the flow control unit and the pressure monitoring unit are connected with the control module through a sensor, wireless communication and networking of an operating room central control system are supported, and remote monitoring and data transmission are achieved. Meanwhile, the waste liquid recovery unit is additionally arranged, so that the operation environment can be kept clean, the safety and efficiency of the endoscopic operation are further improved, and the medical risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a special water injection device and method for endoscopic surgery based on pressure monitoring and flow control. Background Art

[0002] In modern medicine, endoscopic surgery is widely used because of its small trauma and fast recovery. Traditional water injection devices play an important role in endoscopic surgery, mainly used to provide a clear vision surgical environment. However, the existing water injection devices have some deficiencies in aspects such as flow control, pressure monitoring, and waste liquid treatment. Specifically: on the one hand, traditional water injection devices usually lack the functions of flow and pressure monitoring, which may lead to problems of insufficient or excessive liquid infusion during the operation, thus increasing the risk of tissue damage to patients. On the other hand, existing devices generally cannot provide real-time feedback and adjustment of water injection parameters, relying on manual monitoring, which not only increases the workload of medical staff but also raises the risk of medical accidents.

[0003] In addition, for the treatment of waste liquid generated during the water injection process of existing water injection devices, traditional methods often lead to pollution of the surgical environment, posing a threat to surgical safety. Therefore, it is of great practical significance to develop a water injection device for endoscopic surgery with a pressure monitoring, flow control, and waste liquid recovery system. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a special water injection device and method for endoscopic surgery based on pressure monitoring and flow control, which can monitor and adjust the water injection flow and pressure in real time to ensure the safety during the operation; and the flow control unit and the pressure monitoring unit are connected to the control module through sensors, supporting wireless communication and networking with the operating room central control system to achieve remote monitoring and data transmission. At the same time, a waste liquid recovery unit is added, which helps to keep the surgical environment clean, further improves the safety and efficiency of endoscopic surgery, and reduces the medical risk.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] A special water injection device for endoscopic surgery based on pressure monitoring and flow control, including a water injection pipeline, one end of the water injection pipeline is connected to a water injection module, and the other end of the water injection pipeline is provided with a heating unit, a filtering unit, a flow control unit, a pressure monitoring unit, and a waste liquid recovery unit on the pipeline for monitoring and controlling the flow, pressure, and recovering waste liquid. An injection hose is installed at the liquid outlet of the pressure monitoring unit, and the other end of the injection hose is connected to a syringe.

[0007] Preferably, the flow control unit includes a flow sensor and a first regulating valve. The flow sensor is installed on the first regulating valve, and the first regulating valve is used to control the water injection flow rate. The pressure monitoring unit includes a pressure sensor and a second regulating valve. The pressure sensor is installed on the second regulating valve to monitor the liquid infusion pressure, and the second regulating valve is used to control the liquid injection pressure.

[0008] Preferably, both the flow sensor and the pressure sensor are connected to a control module. A microprocessor is provided inside the control module for receiving and processing the monitored values of the flow sensor and the pressure sensor.

[0009] Preferably, the microprocessor integrates a wireless communication module, which supports networking with the operating room central control system via Bluetooth or Wi-Fi to achieve remote monitoring of surgical parameters. The other end of the microprocessor is connected to a display terminal, which is used to preset pressure and flow parameters, display real-time data, and is equipped with an alarm function.

[0010] Preferably, the waste liquid recovery unit includes a waste liquid recovery tank and a third regulating valve. The third regulating valve is connected to the water injection pipeline, and the other end of the third regulating valve is connected to the waste liquid recovery tank for collecting postoperative waste liquid.

[0011] Preferably, the heating unit is a constant temperature heating mechanism, which is arranged on the water delivery pipeline of the water injection pipeline to maintain the temperature of the injected liquid constant at the human body temperature.

[0012] Preferably, the filtering unit is a filter, which is arranged on one side of the heating unit. The other side of the filter is connected to the flow control unit, and the filter is installed on the input pipeline of the water injection pipeline and is composed of a pre-filter fiber layer, an intermediate activated carbon adsorption layer, and a terminal microporous membrane filtering layer for filtering particles or bubbles in the injected liquid.

[0013] Preferably, an expansion part is provided at the connection between the syringe and the water injection hose. The expansion part is close to the syringe and is formed by the outer bulge of the wall of the water injection hose, and the expansion part is spherical.

[0014] Preferably, the water injection module is composed of a liquid storage tank and a power pump. The liquid storage tank is used to store sterile physiological saline for endoscopic surgery. The liquid storage tank is connected to the power pump through an infusion pipeline. The power pump is a peristaltic pump or a centrifugal pump, which is used to provide stable liquid infusion power, and the output end of the power pump is connected to the water injection pipeline.

[0015] The present invention also provides a usage method of the above-mentioned endoscopic surgery special water injection device based on pressure monitoring and flow control, including the following steps:

[0016] S1. Connect one end of the water injection pipeline to the water injection module, and connect the other end to the heating unit, filtration unit, flow control unit, and pressure monitoring unit in sequence. Install a water injection hose at the liquid outlet of the pressure monitoring unit and connect it to the syringe. At the same time, connect the third regulating valve of the waste liquid recovery unit to the water injection pipeline and keep it closed, and then connect it to the waste liquid recovery tank;

[0017] S2. Preset the pressure and flow parameters through the display terminal, and turn on the heating unit to ensure that the temperature of the injected liquid can be maintained constant at the human body temperature; check whether the filtration unit, flow control unit, and pressure monitoring unit are working properly; test the connection of the control module with the flow and pressure sensors, and the networking function of the wireless communication module with the operating room central control system;

[0018] S3. Start the water injection module, and the liquid passes through heating and filtration in sequence and then enters the pipeline. The flow sensor and pressure sensor monitor the data in real time and transmit it to the control module; the control module adjusts the water injection flow and the liquid injection pressure respectively through the first regulating valve and the second regulating valve according to the preset parameters and the real-time monitoring values. If the pressure or flow exceeds the preset range, the control module triggers to control the opening degrees of the first regulating valve and the second regulating valve, and at the same time the display terminal triggers the alarm function;

[0019] S4. After the endoscopic surgery is completed, turn off the water injection module, the first regulating valve, and the second regulating valve, and turn on the third regulating valve to flow the waste liquid in the water injection pipeline into the waste liquid recovery tank; at the same time, the control module stores the intraoperative pressure and flow data and uploads the data to the operating room central control system through wireless communication.

[0020] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0021] (1) The flow control unit of the present invention includes a flow sensor and a first regulating valve, and the pressure monitoring unit is equipped with a pressure sensor and a second regulating valve. The flow sensor and the pressure sensor can monitor data in real time and transmit it to the control module. The control module can precisely adjust the opening degrees of the first regulating valve and the second regulating valve according to preset parameters to achieve the control of the injection flow rate and the liquid injection pressure. During the operation, if the pressure or flow rate exceeds the preset range, the control module will promptly adjust the valve opening degrees, and at the same time, the display terminal will trigger the alarm function to remind the medical staff to take measures to avoid damaging the patient's tissues due to excessive pressure or flow rate and reduce the surgical risk. At the same time, the heating unit is a constant-temperature heating mechanism that can maintain the temperature of the injected liquid at the human body temperature to avoid adverse effects on the patient's body due to inappropriate liquid temperature. The filtering unit consists of a pre-fiber filtering layer, an intermediate activated carbon adsorption layer, and a terminal microporous membrane filtering layer, which can effectively filter the particles or bubbles in the injected liquid to prevent these impurities from entering the patient's body and causing complications. In addition, the spherical expansion part at the connection between the syringe and the injection hose can buffer the pressure change and further ensure the safety of the endoscopic surgery.

[0022] (2) By presetting the pressure and flow rate parameters through the display terminal, the device can be adjusted according to the preset values and the real-time monitoring situation during operation, reducing the workload and error of manual operation by medical staff. During the operation, there is no need for medical staff to constantly monitor and frequently adjust the flow rate and pressure, and they can devote more energy to the operation itself, thus improving the surgical efficiency. And a waste liquid recovery box is provided to avoid the intraoperative waste liquid in the injection pipeline from affecting the surgical environment.

[0023] (3) The microprocessor integrates a wireless communication module, which supports networking with the operating room central control system through Bluetooth or Wi-Fi to realize remote monitoring of surgical parameters. This enables other relevant staff to understand the surgical situation in real time remotely and provide guidance and support in a timely manner. At the same time, the upload of data also helps the hospital to achieve informatization management and improve the overall level of medical services. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a structural diagram of a special injection device for endoscopic surgery based on pressure monitoring and flow control of the present invention;

[0026] Figure 2Schematic diagram of the modules of a special water injection device for laparoscopic surgery based on pressure monitoring and flow control according to the present invention;

[0027] Figure 3 Flowchart of the usage method of a special water injection device for laparoscopic surgery based on pressure monitoring and flow control according to the present invention;

[0028] Explanation of the reference numerals:

[0029] 1. Water injection pipeline; 2. Heating unit; 3. Filter unit; 4. Flow control unit; 5. Pressure monitoring unit; 6. Waste liquid recovery unit; 7. Water injection hose; 8. Expansion part; 9. Syringe; 10. Control module; 11. Constant temperature heating mechanism; 12. Filter; 13. Flow sensor; 14. First regulating valve; 15. Pressure sensor; 16. Second regulating valve; 17. Microprocessor; 18. Display terminal; 19. Waste liquid recovery tank; 20. Third regulating valve; 21. Water injection module; 22. Liquid storage tank; 23. Power pump. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0032] Embodiment 1

[0033] As Figure 1 and Figure 2 shown, the present invention provides a special water injection device for laparoscopic surgery based on pressure monitoring and flow control, including a water injection pipeline 1. One end of the water injection pipeline 1 is connected to a water injection module 21, and on the other end pipeline of the water injection pipeline 1, there are arranged a heating unit 2, a filter unit 3, a flow control unit 4, a pressure monitoring unit 5, and a waste liquid recovery unit 6, which are used to monitor and control the flow rate, pressure, and recover the waste liquid. A water injection hose 7 is installed at the liquid outlet of the pressure monitoring unit 5, and the other end of the water injection hose 7 is connected to a syringe 9.

[0034] Among them, the flow control unit 4 includes a flow sensor 13 and a first regulating valve 14. The flow sensor 13 is installed on the first regulating valve 14, and the first regulating valve 14 is used to control the water injection flow rate; the pressure monitoring unit 5 includes a pressure sensor 15 and a second regulating valve 16. The pressure sensor 15 is installed on the second regulating valve 16 and is used to monitor the liquid infusion pressure, and the second regulating valve 16 is used to control the liquid injection pressure.

[0035] In addition, both the flow sensor 13 and the pressure sensor 15 are connected to a control module 10. Inside the control module 10, there is a microprocessor 17, which is used to receive and process the monitored values of the flow sensor 13 and the pressure sensor 15. The microprocessor 17 integrates a wireless communication module, which supports networking with the operating room central control system via Bluetooth or Wi-Fi to realize remote monitoring of surgical parameters; the other end of the microprocessor 17 is connected to a display terminal 18. The display terminal 18 is used to preset pressure and flow parameters, display real-time data, and is configured with an alarm function.

[0036] Among them, the microprocessor 17 is a microprocessor 17 with an ARM Cortex-M7 and DSP dual-core architecture, which receives data from the flow sensor 13 and the pressure sensor 15 in real time and executes the PID control algorithm: when the pressure exceeds the preset threshold, the microprocessor 17 drives the second regulating valve 16 to respond quickly through a PWM signal. It should be noted that the response time < 150 ms, and at the same time, the alarm function of the display terminal 18 is triggered. Here, the alarm function is: yellow warning, red alarm, emergency stop; when the monitored flow rate or pressure is close to the preset safety threshold but has not exceeded it, the system will issue a yellow warning. Alarm effect: The yellow warning light on the display terminal 18 will flash to prompt medical staff to pay attention and monitor to prevent potential abnormal situations from occurring. When the monitored flow rate or pressure exceeds the set safety range, the system will automatically trigger a red alarm. Alarm effect: The red warning light on the display terminal 18 will flash and a sound alarm will be issued, requiring medical staff to intervene immediately and check the equipment status. At this time, the control module 10 will quickly adjust the opening of the valve to reduce the flow rate or pressure to the normal range. In extreme cases, if the flow rate gets out of control or the pressure reaches the limit, the system will initiate an emergency stop. Alarm effect: At this time, the display terminal 18 emits a strong sound alarm, and at the same time, the first regulating valve 14 and the second regulating valve 16 are deactivated, placing the system in a safe state to minimize potential harm to the patient.

[0037] In addition, when the flow rate is abnormal, the first regulating valve 14 synchronously adjusts the opening. The microprocessor 17 integrates an IEEE 802.11ac wireless communication module, which supports real-time uploading of surgical parameters to the operating room central control system.

[0038] It should be noted that the implementation of the PID control algorithm is as follows: PID consists of three parts:

[0039] Proportion (P): Generate a control quantity according to the current error (the difference between the set value and the measured value), and the proportional control force is proportional to the error.

[0040] Integral (I): Integrate the historical error to eliminate the steady-state error, and accumulate the past errors to adjust the control input.

[0041] Derivative (D): Predict the future error and adjust according to the change rate of the error to improve the stability and response speed of the system.

[0042] The mathematical expression is:

[0043]

[0044] In the formula, u(t) is the control output, K p is the proportional gain, K i is the integral gain, K d is the derivative gain, e(t) is the error at the current moment, is the cumulative value of the error e(τ) within the time period [0, t].

[0045] The microprocessor 17 (such as the dual-core architecture of ARM Cortex-M7 and DSP) integrates the PID control algorithm to control the pressure and flow rate of liquid injection. The specific implementation steps are as follows:

[0046] Obtain the current flow rate and pressure data in real time through the flow sensor 13 and the pressure sensor 15, and calculate the current error value e(t); according to the selected K p , K i , K d value, the microprocessor 17 calculates the control output u(t) in real time to adjust the opening degree of the regulating valve. When the pressure exceeds the preset threshold, the microprocessor 17 quickly adjusts the opening degree of the second regulating valve 16 through the PWM signal. The control module 10 ensures that the response time is less than 150 milliseconds, and at the same time issues an alarm indication to the control system (such as a yellow warning, a red alarm, or an emergency stop). When an abnormality is detected in the flow rate, the first regulating valve 14 will also synchronously adjust the opening degree to cope with the flow rate change. The control module 10 integrates a wireless communication module and uploads the surgical parameter data to the operating room central control system in real time to achieve remote monitoring and centralized management of the data.

[0047] In the above content, the waste liquid recovery unit 6 includes a waste liquid recovery tank 19 and a third regulating valve 20. The third regulating valve 20 is connected to the water injection pipeline 1, and the other end of the third regulating valve 20 is connected to the waste liquid recovery tank 19, which is used to collect the waste liquid after the operation. The heating unit 2 is a constant temperature heating mechanism 11. The constant temperature heating mechanism 11 is arranged on the water delivery pipeline of the water injection pipeline 1 to keep the temperature of the injected liquid constant at the human body temperature. Specifically, the constant temperature heating mechanism 11 adopts a semiconductor constant temperature module, and heats the input liquid to 37 ± 0.5 °C through Peltier effect elements to avoid tissue spasm caused by cold stimulation in patients. The filtering unit 3 is a filter 12. The filter 12 is arranged on one side of the heating unit 2, and the other side of the filter 12 is connected to the flow control unit 4. The filter 12 is installed on the input pipeline of the water injection pipeline 1 and is composed of a pre - placed fiber filtering layer, an intermediate activated carbon adsorption layer and a terminal microporous membrane filtering layer, which is used to filter particles or bubbles with a size of more than 0.22 μm in the injected liquid.

[0048] In addition, an expansion part 8 is provided at the connection between the syringe 9 and the water injection hose 7. The expansion part 8 is close to the syringe 9 and is formed by the outer bulge of the wall of the water injection hose 7. The expansion part 8 is spherical and is used to absorb the instantaneous pulse pressure generated by the injection of the syringe 9 to prevent tissue damage caused by pressure shock. The water injection module 21 is composed of a liquid storage tank 22 and a power pump 23. The liquid storage tank 22 is used to store sterile normal saline for endoscopic surgery; the liquid storage tank 22 is connected to the power pump 23 through an infusion pipeline. The power pump 23 is a peristaltic pump or a centrifugal pump, which is used to provide stable liquid infusion power, and the output end of the power pump 23 is connected to the water injection pipeline 1.

[0049] According to the above content, referring to Figure 3 , this embodiment also provides a method for using a special water injection device for endoscopic surgery based on pressure monitoring and flow control, including the following steps:

[0050] S1. Connect one end of the water injection pipeline to the water injection module, and connect the other end to the heating unit, filtering unit, flow control unit, and pressure monitoring unit in sequence. Install a water injection hose at the liquid outlet of the pressure monitoring unit and connect it to the syringe. At the same time, connect the third regulating valve of the waste liquid recovery unit to the water injection pipeline and keep it in a closed state, and then connect it to the waste liquid recovery tank;

[0051] S2. Preset the pressure and flow parameters through the display terminal, and turn on the heating unit to ensure that the temperature of the injected liquid can be maintained constant at the human body temperature; check whether the filtering unit, flow control unit, and pressure monitoring unit are working properly; test the connection between the control module and the flow and pressure sensors, and the networking function of the wireless communication module and the operating room central control system;

[0052] S3. Start the water injection module. The liquid passes through heating and filtration in sequence and then enters the pipeline. The flow sensor and pressure sensor monitor the data in real time and transmit it to the control module. The control module adjusts the water injection flow rate and the liquid injection pressure respectively through the first regulating valve and the second regulating valve according to the preset parameters and the real-time monitoring values. If the pressure or flow rate exceeds the preset range, the control module triggers to control the opening degrees of the first regulating valve and the second regulating valve, and at the same time, the display terminal triggers the alarm function;

[0053] S4. After the endoscopic surgery is completed, close the water injection module, the first regulating valve and the second regulating valve, open the third regulating valve, and let the waste liquid in the water injection pipeline flow into the waste liquid recovery box. At the same time, the control module stores the intraoperative pressure and flow rate data and uploads the data to the central control system of the operating room through wireless communication.

[0054] Therefore, by adopting the above-mentioned special water injection device and method for endoscopic surgery based on pressure monitoring and flow control, it is possible to monitor and adjust the water injection flow rate and pressure in real time to ensure the safety during the operation. Moreover, the flow control unit and the pressure monitoring unit are connected to the control module through sensors, support wireless communication and networking with the central control system of the operating room, and realize remote monitoring and data transmission. At the same time, a waste liquid recovery unit is added, which helps to keep the operation environment clean, further improves the safety and efficiency of endoscopic surgery, and reduces the medical risk.

[0055] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. At the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. To sum up, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A dedicated water injection device for laparoscopic surgery based on pressure monitoring and flow control, characterized in that, It includes a water injection pipeline. One end of the water injection pipeline is connected to a water injection module. On the pipeline at the other end of the water injection pipeline, there are a heating unit, a filtering unit, a flow control unit, a pressure monitoring unit, and a waste liquid recovery unit, which are used to monitor and control the flow rate, pressure, and recover waste liquid. At the liquid outlet of the pressure monitoring unit, a water injection hose is installed, and the other end of the water injection hose is connected to a syringe.

2. The special water injection device for endoscopic surgery based on pressure monitoring and flow control according to claim 1, wherein The flow control unit includes a flow sensor and a first regulating valve. The flow sensor is installed on the first regulating valve, and the first regulating valve is used to control the water injection flow rate; the pressure monitoring unit includes a pressure sensor and a second regulating valve. The pressure sensor is installed on the second regulating valve and is used to monitor the liquid infusion pressure, and the second regulating valve is used to control the liquid injection pressure.

3. The special water injection device for endoscopic surgery based on pressure monitoring and flow control according to claim 2, characterized in that, Both the flow sensor and the pressure sensor are connected to a control module. Inside the control module, there is a microprocessor, which is used to receive and process the monitored values of the flow sensor and the pressure sensor.

4. The special water injection device for endoscopic surgery based on pressure monitoring and flow control according to claim 3, wherein The microprocessor integrates a wireless communication module, which supports networking with the operating room central control system through Bluetooth or Wi-Fi to achieve remote monitoring of surgical parameters; the other end of the microprocessor is connected to a display terminal. The display terminal is used to preset pressure and flow rate parameters, display real-time data, and is configured with an alarm function.

5. The special water injection device for endoscopic surgery based on pressure monitoring and flow control according to claim 1, characterized in that, The waste liquid recovery unit includes a waste liquid recovery tank and a third regulating valve. The third regulating valve is connected to the water injection pipeline, and the other end of the third regulating valve is connected to the waste liquid recovery tank, which is used to collect postoperative waste liquid.

6. The special water injection device for endoscopic surgery based on pressure monitoring and flow control according to claim 1, characterized in that, The heating unit is a constant temperature heating mechanism, which is arranged on the water delivery pipeline of the water injection pipeline and is used to keep the temperature of the injected liquid constant at the human body temperature.

7. The special water injection device for laparoscopic surgery based on pressure monitoring and flow control according to claim 1, characterized in that, The filtering unit is a filter, which is arranged on one side of the heating unit. The other side of the filter is connected to the flow control unit, and the filter is installed on the input pipeline of the water injection pipeline and is composed of a front fiber filtering layer, an intermediate activated carbon adsorption layer, and a terminal microporous membrane filtering layer, which is used to filter particles or bubbles in the injected liquid.

8. The special water injection device for endoscopic surgery based on pressure monitoring and flow control according to claim 1, wherein, At the connection between the syringe and the water injection hose, there is an expansion part, which is close to the syringe and is formed by the outer bulge of the wall of the water injection hose, and the expansion part is spherical.

9. The special water injection device for laparoscopic surgery based on pressure monitoring and flow control according to claim 1, characterized in that, The water injection module is composed of a liquid storage tank and a power pump. The liquid storage tank is used to store sterile physiological saline for endoscopic surgery; the liquid storage tank is connected to the power pump through an infusion pipeline. The power pump is a peristaltic pump or a centrifugal pump, which is used to provide stable liquid infusion power, and the output end of the power pump is connected to the water injection pipeline.

10. A method for using a dedicated water injection device for endoscopic surgery based on pressure monitoring and flow control according to any one of claims 1 to 9, characterized in that, It includes the following steps: S1. Connect one end of the water injection pipeline to the water injection module, and connect the other end to the heating unit, the filtering unit, the flow control unit, and the pressure monitoring unit in sequence. Install a water injection hose at the liquid outlet of the pressure monitoring unit and connect it to a syringe. At the same time, connect the third regulating valve of the waste liquid recovery unit to the water injection pipeline and keep it in a closed state, and then connect it to the waste liquid recovery tank; S2. By presetting the pressure and flow rate parameters of the display terminal, turn on the heating unit to ensure that the temperature of the injected liquid can be maintained constant at the human body temperature; check whether the filtration unit, flow control unit, and pressure monitoring unit are working properly; test the connection between the control module and the flow rate and pressure sensors, as well as the networking function of the wireless communication module with the central control system in the operating room; S3. Start the water injection module. The liquid passes through heating and filtration in sequence and then enters the pipeline. The flow rate sensor and pressure sensor monitor the data in real time and transmit it to the control module. The control module adjusts the water injection flow rate and liquid injection pressure through the first regulating valve and the second regulating valve respectively according to the preset parameters and the real-time monitored values. If the pressure or flow rate exceeds the preset range, the control module triggers to control the opening degrees of the first regulating valve and the second regulating valve, and at the same time the display terminal triggers the alarm function; S4. After the endoscopic surgery is completed, turn off the water injection module, the first regulating valve, and the second regulating valve, turn on the third regulating valve, and let the waste liquid in the water injection pipeline flow into the waste liquid recovery box; at the same time, the control module stores the intraoperative pressure and flow rate data and uploads the data to the central control system in the operating room by wireless communication.

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