A pneumostasis machine with dual temperature sensors and control algorithm thereof

Abstract

The application provides a pneumoperitoneum machine with double temperature sensors and a control algorithm thereof, and solves the problems of insufficient electric heating temperature control precision of the pneumoperitoneum machine and the like, and comprises a pneumoperitoneum machine host, a ventilation assembly built in the pneumoperitoneum machine host, a heating assembly arranged on the ventilation assembly, two temperature sensors symmetrically built in an air outlet of the ventilation assembly, a microcontroller connected with the temperature sensors, and the microcontroller connected with the heating assembly through a MOS tube. The application has the advantages of high temperature control precision, stable structure and the like.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an insufflator with dual temperature sensors and its control algorithm. Background Technology

[0002] Insufflator is an indispensable device for establishing and maintaining pneumoperitoneum during laparoscopic surgery. Because the carbon dioxide used in insufflator is at a low temperature, it lowers the patient's body temperature after entering the body, causing postoperative pain, surgical site inflammation, and other complications. Clinical studies have shown that using a heated insufflator can significantly maintain the body's internal temperature and reduce the probability of these complications. Although heated insufflators are available on the market, most use a single temperature sensor for temperature monitoring and control, resulting in low temperature control accuracy, low reliability, and the inability to monitor the temperature sensor in real time. Since temperature has a significant impact on patient safety, a failure in temperature control can endanger the patient's life.

[0003] To address the shortcomings of existing technologies, people have conducted long-term research and proposed various solutions. For example, Chinese patent literature discloses a control method for an insufflator and an insufflator [202210861644.4]. This method involves fuzzifying the air pressure deviation value and the rate of change of the air pressure deviation value in a fuzzy controller, performing fuzzy reasoning on the three PID control parameters (proportional control parameter, integral control parameter, and derivative control parameter), and defuzzifying them. The resulting outputs the proportional control parameter, integral control parameter, and derivative control parameter of the PID controller. These three PID control parameters are then input into the PID controller, causing the PID controller to adjust the PWM parameter and generate a PWM voltage pulse signal to adjust the opening of the proportional valve.

[0004] The above solution has solved the problem of poor heating effect of the pneumoperitoneum machine to some extent, but it still has many shortcomings, such as the inability to guarantee temperature control accuracy. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed pneumoperitoneum machine with dual temperature sensors that has high temperature control accuracy.

[0006] Another objective of this invention is to address the aforementioned problems by providing a control algorithm with dual temperature sensors that offers good temperature control performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an insufflator with dual temperature sensors, comprising an insufflator main unit, an insufflator main unit with a built-in ventilation component, the ventilation component being equipped with a heating component, two temperature sensors symmetrically built into the air outlet of the ventilation component, the temperature sensors being connected to a microcontroller, and the microcontroller being connected to the heating component through a MOS transistor.

[0008] In the above-mentioned pneumoperitoneum machine with dual temperature sensors, the ventilation component is equipped with a monitoring port, which is connected to the pressure sensor and the pressure regulating component, and the pressure sensor and the pressure regulating component are connected to the microcontroller.

[0009] In the above-mentioned pneumoperitoneum machine with dual temperature sensors, the ventilation assembly includes a ventilation pipeline, with on / off valves respectively installed at the inlet and outlet of the ventilation pipeline. The ventilation pipeline is connected to the pressure regulating assembly through a diversion valve and a diversion pipeline. A flow regulating valve is installed in the middle of the ventilation pipeline, and the ventilation pipelines before and after the flow regulating valve are connected to the heating assembly.

[0010] In the aforementioned pneumoperitoneum machine with dual temperature sensors, the heating assembly includes a heating pipe connected to a flow regulating valve, a heating tank connected to the heating pipe, an electric heating coil inside the heating tank, a spiral heat-conducting fin connected to the electric heating coil, a cooling tank provided with the heating tank, a cooling tank connected to a pressure regulating assembly via a return pipe, and a compressor and an on / off valve are provided between the cooling tank and the heating tank, a cooling pipe extending into the heating tank, a flow regulating valve and an on / off valve provided between the cooling pipe and the cooling tank, a hollow spiral cooling fin connected to the cooling pipe, a thermoelectric film pressed between the cooling fin and the heat-conducting fin, and the thermoelectric film connected to a microcontroller via a digital-to-analog converter.

[0011] In the above-mentioned pneumoperitoneum machine with dual temperature sensors, the pressure regulating component includes a buffer tank with a built-in elastic buffer element. The buffer tank is connected to a return pipeline and a pressure dividing pipeline. The pressure dividing pipeline is connected to an external gas tank through an inflation pipeline and a compressor. The buffer tank is connected to a pressure relief valve through a pressure relief pipeline.

[0012] A control algorithm with dual temperature sensors, employing the aforementioned insufflator with dual temperature sensors, includes the following steps:

[0013] S1: The insufflator is powered on and the system initializes and enters standby mode;

[0014] S2: The insufflator starts heating and the main unit enters the heating state. If heating is successful, proceed to step S3; otherwise, return to standby state.

[0015] S3: The host automatically identifies the two temperature sensors via the single-bus protocol. If the identification is successful, proceed to step S4; otherwise, return to standby mode.

[0016] S4: After successful identification, acquire signals from the two temperature sensors respectively;

[0017] S5: Perform data processing;

[0018] S6: Outputs a corresponding PWM signal to control the heating component to maintain a constant temperature.

[0019] In the control algorithm with dual temperature sensors described above, step S3 includes the following steps:

[0020] S31: Scan the digital temperature sensor and obtain its inherent ROM serial number. If the ROM serial number is not obtained, proceed to step S34; otherwise, proceed to step S32.

[0021] 332: After matching the ROM serial number, the temperature is read;

[0022] S33: Perform difference processing on the data acquired by the two temperature sensors. If the difference is ≤2℃, the two temperature sensors are determined to be working normally and the subsequent data acquisition is initiated. Otherwise, the temperature sensors are determined to be abnormal and the process proceeds to step S34.

[0023] S34: The main unit displays a temperature sensor malfunction message and stops heating.

[0024] In the control algorithm with dual temperature sensors described above, step S4 includes the following steps:

[0025] S41: Read the signal from the digital temperature sensor to obtain the data sequence;

[0026] S42: Determine whether the number of samples meets the standard. If yes, proceed to step S43; otherwise, return to step S41.

[0027] S43: Perform digital filtering on the data sequence to obtain the data to be processed.

[0028] In the control algorithm with dual temperature sensors described above, step S4 includes the following steps:

[0029] S44: Read data from the digital temperature sensor N times consecutively;

[0030] S45: Sort N data points from smallest to largest and remove extreme values;

[0031] S46: Calculate the average of the remaining N-2 data points to obtain the data to be processed.

[0032] In the control algorithm with dual temperature sensors described above, step S5 includes the following steps:

[0033] S51: Compare the collected data with the set value;

[0034] S52: If the collected data is less than the set value, the PWM output duty cycle will increase after PID processing, and the heating power will increase until the set value is reached; if the collected data is greater than or equal to the set value, the PWM output duty cycle will decrease after PID processing, and the heating power will decrease until no heating is performed, and the host actively dissipates heat to reach the set value.

[0035] Compared with existing technologies, the advantages of this invention are as follows: the heating component, temperature sensor, and micro-control feedback adjustment ensure the temperature control accuracy of the heating component; the ventilation component is connected to the heating component and has an active heat dissipation function, thereby achieving rapid cooling of the ventilation component and improving temperature regulation sensitivity; the two temperature sensors cooperate with each other and use control algorithms to achieve constant temperature control, and can automatically troubleshoot fault locations. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the pneumoperitoneum machine main unit of the present invention;

[0037] Figure 2 This is an internal structural diagram of the main body of the pneumoperitoneum machine of the present invention;

[0038] Figure 3 This is a structural cross-sectional view of the heating tank body of the present invention;

[0039] Figure 4 This is the control principle diagram of the present invention;

[0040] Figure 5 This is a flowchart of the host computer operation process of the present invention;

[0041] Figure 6 This is an automatic identification flowchart of the present invention;

[0042] Figure 7 This is a flowchart of the data acquisition process of this invention;

[0043] Figure 8 This is a flowchart of the extreme value removal averaging filter method of the present invention;

[0044] Figure 9 This is a data processing flowchart of the present invention;

[0045] In the diagram, the following components are included: main unit of the pneumoperitoneum machine 1, ventilation assembly 2, ventilation pipeline 21, diversion pipeline 22, heating assembly 3, heating pipeline 31, heating tank 32, electric heating coil 33, heat conducting plate 34, cooling tank 35, return pipeline 36, cooling plate 37, cooling pipeline 38, pressure regulating assembly 4, buffer tank 41, elastic buffer element 42, pressure dividing pipeline 43, inflation pipeline 44, and pressure relief pipeline 45. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] like Figure 1-2As shown, an insufflator with dual temperature sensors includes an insufflator main unit 1. The main unit 1 has a built-in ventilation component 2 for connecting to an external gas cylinder, and introduces carbon dioxide stored in the external gas cylinder into the patient's body through an extension tube. During ventilation, excessively low carbon dioxide temperature can easily cause postoperative pain. Therefore, the ventilation component 2 is equipped with a heating component 3 to warm the carbon dioxide and reduce discomfort. To ensure temperature control accuracy, two temperature sensors are symmetrically built into the outlet of the ventilation component 2. The temperature sensors are connected to a microcontroller, which is connected to the heating component 3 via a MOSFET to form a closed-loop automatic control, enabling constant temperature heating control.

[0049] Since the introduced carbon dioxide is in a compressed state, it needs to be depressurized. At the same time, due to the heating effect of the heating component 3, the internal air pressure of the ventilation component 2 further increases. In order to ensure stable output pressure, the ventilation component 2 is equipped with a monitoring port, which is connected to the air pressure sensor and the pressure regulating component 4. The air pressure sensor and the pressure regulating component 4 are connected to the microcontroller to form another closed-loop automatic control system, so as to achieve constant pressure inside the ventilation component 2.

[0050] In detail, similar to conventional pneumoperitoneum chambers, the ventilation assembly 2 in this application also includes a ventilation pipe 21. On / off valves are installed at the inlet and outlet of the ventilation pipe 21 to completely seal it. Unlike conventional ventilation structures, the ventilation pipe 21 in this application is connected to the pressure regulating assembly 4 via a diversion valve and a diversion pipe 22. The diversion valve and pressure regulating assembly 4 perform pressure reduction on the introduced carbon dioxide, providing a better buffering effect while guiding some carbon dioxide into the heating assembly 3 for active cooling, thus improving the temperature control sensitivity of the heating assembly 3. A flow regulating valve is installed in the middle of the ventilation pipe 21 to limit the flow. Some carbon dioxide flows into the ventilation pipe 21 after passing through the heating assembly 3. The ventilation pipes 21 before and after the flow regulating valve are connected to the heating assembly 3 to indirectly heat the carbon dioxide within the ventilation pipe 21.

[0051] Example 2

[0052] like Figure 3As shown, the structure, principle, and specific implementation steps of this embodiment are similar to those of Embodiment 1. The difference lies in that the heating component 3 in this embodiment includes a heating pipe 31 connected to a flow regulating valve. The heating pipe 31 is connected to a heating tank 32, which heats the heating pipe 31. The heating tank 32 houses an electric heating coil 33, which is connected to a spiral heat-conducting fin 34. After carbon dioxide is introduced into the heating tank 32, the heat-conducting fin 34 increases the heat dissipation area of ​​the electric heating coil 33, causing the interior of the heating tank 32 to heat up rapidly. In addition, the heating tank 32 is usually filled with a suitable heat-conducting medium. This ensures a linear temperature change, preventing temperature jumps that could damage components. It also improves heat utilization and reduces energy dissipation during long-term gas supply.

[0053] Example 3

[0054] like Figure 2-3 As shown, the structure, principle, and specific implementation steps of this embodiment are similar to those of Embodiment 2. The difference lies in that the heating component 3 in this embodiment is equipped with an active heat dissipation and cooling structure, and its heating tank 32 is equipped with a cooling tank 35. The cooling tank 35 is connected to the pressure regulating component 4 through a return pipe 36, and a compressor 37 and an on / off valve are installed between them. The carbon dioxide processed by the pressure regulating component 4 is introduced into the heating tank 32. The built-in pressure sensor, the on / off valve, and the pressure regulating component 4 provide feedback regulation to maintain a constant internal pressure and simultaneously achieve carbon dioxide circulation to ensure sufficient low-temperature carbon dioxide is provided inside. The cooling tank 35 is connected to a cooling pipe 38 extending into the heating tank 32. A flow regulating valve and an on / off valve are installed between the cooling pipe 38 and the cooling tank 35. When the internal temperature of the heating tank 32 is too high, heating is stopped, and the flow regulating valve and the on / off valve open to introduce carbon dioxide for active cooling. The cooling tank 35 has two independent cavities, which are respectively connected to the flow regulating valve and the on / off valve.

[0055] To improve heat exchange efficiency, cooling pipe 38 is connected to a hollow, spiral-shaped cooling fin 37. The cooling fin 37 adheres to the heat-conducting fin 34, directly cooling the heat-conducting fin 34 while absorbing heat from the heating tank 32. A thermoelectric film is pressed between the cooling fin 37 and the heat-conducting fin 34, and the thermoelectric film is connected to a microcontroller via a digital-to-analog converter (DAC). The thermoelectric signal from the thermoelectric film is converted into a digital signal by the DAC and transmitted to the microcontroller, which can accurately sense and determine the cooling rate. This introduces another control input to the existing closed-loop control system, allowing for timely correction of the temperature control process and reducing its fluctuation coefficient.

[0056] Example 4

[0057] The structure, principle and specific implementation steps of this embodiment are similar to those of Embodiment 2. The difference is that in this embodiment, the pressure regulating component 4, in addition to regulating the internal pressure of the ventilation component 2 to maintain a constant output pressure, also buffers the input carbon dioxide to prevent the heating component 3 from being impacted, and at the same time recovers excess carbon dioxide to reduce external leakage.

[0058] Furthermore, the pressure regulating component 4 specifically includes a buffer tank 41, which has a built-in elastic buffer element 42 to effectively avoid the pipeline air hammer effect. The buffer tank 41 is connected to the return pipeline 36 and the pressure dividing pipeline 43. The pressure dividing pipeline 43 is connected to an external air tank through the inflation pipeline 44 and the compressor. The buffer tank 41 is connected to a pressure relief valve through the pressure relief pipeline 45. When the internal air pressure of the buffer tank 41 is too high, the pressure relief valve will release the pressure urgently and send an alarm signal to the pneumoperitoneum machine main unit 1.

[0059] Example 5

[0060] The structure, principle, and specific implementation steps of this embodiment are similar to those of Embodiment 2. The difference is that when the on / off valves at both ends of the ventilation pipe 21 in this embodiment are in the closed state, the compressor connected to the return pipe 36 in the heating assembly 3 and the compressor connected to the charging pipe 44 in the pressure regulating assembly 4 are started, and the buffer tank 41 and the cooling tank 35 are depressurized. In this state, the heating tank 32 in the heating assembly 3 is in a closed state, and the heat conduction path of its internal electric heating element and heat conduction medium is reduced, so that the heating assembly 3 is in a heat preservation state, which facilitates subsequent rapid heating.

[0061] Example 6

[0062] The structure, principle, and specific implementation steps of this embodiment are similar to those of Embodiment 2. The difference is that in this embodiment, the on / off valve at the inlet end of the ventilation pipeline 21 is in a closed state while the on / off valve at the outlet end is in an open state, and the flow regulating valve in the middle of the ventilation pipeline 21 maintains the maximum flow rate. The compressor of the inflation pipeline 44 in the pressure regulating assembly 4 starts and enters the depressurization state. At this time, the pneumoperitoneum machine main unit 1 performs depressurization work, and the excess carbon dioxide is discharged through the inflation pipeline 44.

[0063] Example 7

[0064] The structure, principle, and specific implementation steps of this embodiment are similar to those of Embodiment 2. The difference is that in this embodiment, the on / off valve at the inlet end of the ventilation pipe 21 is in the open state while the on / off valve at the outlet end is in the closed state. The compressor connected to the return pipe 36 in the heating assembly 3 is started and the connected on / off valve is in the open state. In this state, high-speed carbon dioxide is circulated into the cooling tank 35. The cooling pipe 38 connected to the cooling tank 35, as well as the flow regulating valve and the on / off valve, are opened to rapidly cool the inside of the heating tank 32, meeting the initialization requirements of the temperature control system of the pneumoperitoneum machine host 1.

[0065] like Figure 4 As shown, a control algorithm with dual temperature sensors is employed in the aforementioned insufflator with dual temperature sensors. The microcontroller (MCU) automatically identifies and acquires signals from both digital temperature sensors. The processed signal values ​​are compared with the preset temperature value of the device. Based on the magnitude of the deviation, a PID algorithm is used to calculate and control the duty cycle of the MOSFET. For example, if the difference between the acquired temperature and the preset temperature is large, the MCU automatically increases the MOSFET's on-time, causing the heating temperature to rise. If the acquired temperature is close to or exceeds the preset temperature value, the MCU automatically shortens the MOSFET's on-time or turns it off to stop heating. Because temperature input detection and output control form a closed-loop automatic control through the MCU in this circuit framework, constant temperature heating control can be achieved. Figure 5 As shown, it specifically includes the following steps:

[0066] S1: The insufflator is powered on and the system initializes and enters standby mode;

[0067] S2: The insufflator starts heating and the main unit enters the heating state. If heating is successful, proceed to step S3; otherwise, return to standby state.

[0068] S3: The host automatically identifies the two temperature sensors via the single-bus protocol. If the identification is successful, proceed to step S4; otherwise, return to standby mode.

[0069] S4: After successful identification, acquire signals from the two temperature sensors respectively;

[0070] S5: Perform data processing;

[0071] S6: Output the corresponding PWM signal to control the heating component 3 to maintain a constant temperature.

[0072] like Figure 6 As shown, step S3 includes the following steps:

[0073] S31: Scan the digital temperature sensor and obtain its inherent ROM serial number. If the ROM serial number is not obtained, proceed to step S34; otherwise, proceed to step S32.

[0074] 332: After matching the ROM serial number, the temperature is read;

[0075] S33: Perform difference processing on the data acquired by the two temperature sensors. If the difference is ≤2℃, the two temperature sensors are determined to be working normally and the subsequent data acquisition is initiated. Otherwise, the temperature sensors are determined to be abnormal and the process proceeds to step S34.

[0076] S34: The main unit displays a temperature sensor malfunction message and stops heating.

[0077] like Figure 7 As shown, step S4 includes the following steps:

[0078] S41: Read the signal from the digital temperature sensor to obtain the data sequence;

[0079] S42: Determine whether the number of samples meets the standard. If yes, proceed to step S43; otherwise, return to step S41.

[0080] S43: Perform digital filtering on the data sequence to obtain the data to be processed.

[0081] like Figure 8 As shown, step S4 includes the following steps:

[0082] S44: Read data from the digital temperature sensor N times consecutively;

[0083] S45: Sort N data points from smallest to largest and remove extreme values;

[0084] S46: Calculate the average of the remaining N-2 data points to obtain the data to be processed.

[0085] Clearly, this algorithm employs a digital PID control algorithm for data processing. Generally, digital PID control algorithms include incremental PID control and positional PID control. Positional PID control accumulates all previous errors, and the control quantity depends on all past control processes. In contrast, incremental PID control only depends on the error values ​​of the three most recent times. Therefore, when a short-term system failure occurs, the impact on the entire control system is minimal, and malfunctions are unlikely. Comparing the two digital PID control algorithms, this algorithm adopts a digital incremental PID control algorithm, such as... Figure 9 As shown, specific step S5 includes the following steps:

[0086] S51: Compare the collected data with the set value;

[0087] S52: If the collected data is less than the set value, the PWM output duty cycle will increase after PID processing, and the heating power will increase until the set value is reached; if the collected data is greater than or equal to the set value, the PWM output duty cycle will decrease after PID processing, and the heating power will decrease until no heating is performed, and the host actively dissipates heat to reach the set value.

[0088] Example 8

[0089] In this embodiment, the test environment should meet the following requirements: ambient temperature: 23℃±2℃; relative humidity: 60%±15%; atmospheric pressure: 860hPa-1060hPa; wind speed: less than 0.1m / s.

[0090] After the insufflator is installed, set the pressure to 15 mmHg and the flow rates to 5 L / min, 20 L / min, and 50 L / min respectively. Run the main unit and turn on the heating function of the insufflator for 10 minutes. Use a temperature recorder to read the measured temperature value every 5 seconds for a total of 5 readings. Take the average value of the 5 data and record it in the table below.

[0091]

[0092]

[0093] The test data above shows that the temperature control range of a conventional pneumoperitoneum machine is 36℃~41℃, which meets its technical specification of 37±4℃. The temperature control range of the pneumoperitoneum machine in this application is 36℃~39℃, and the constant temperature control accuracy is relatively high.

[0094] In summary, the principle of this embodiment is as follows: the ventilation component 2 inside the pneumoperitoneum machine main unit 1 is equipped with two temperature sensors, which, together with the microcontroller, MOS tube and heating component 3, perform closed-loop feedback control of the temperature. At the same time, the pressure regulating component 4 and the air pressure sensor are introduced to perform closed-loop feedback of the air pressure, thereby ensuring the accuracy of temperature control.

[0095] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0096] Although this document frequently uses terms such as pneumoperitoneum machine main unit 1, ventilation assembly 2, ventilation pipeline 21, diversion pipeline 22, heating assembly 3, heating pipeline 31, heating tank 32, electric heating coil 33, heat-conducting plate 34, cooling tank 35, return pipeline 36, cooling plate 37, cooling pipeline 38, pressure regulating assembly 4, buffer tank 41, elastic buffer element 42, pressure dividing pipeline 43, inflation pipeline 44, and pressure relief pipeline 45, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A pneumoperitoneum machine with dual temperature sensors, comprising a pneumoperitoneum machine main unit (1), wherein the pneumoperitoneum machine main unit (1) has a built-in ventilation assembly (2), characterized in that, The ventilation assembly (2) is equipped with a heating assembly (3). Two temperature sensors are symmetrically integrated at the air outlet of the ventilation assembly (2). The temperature sensors are connected to a microcontroller, which is connected to the heating assembly (3) via a MOS transistor. The ventilation assembly (2) is equipped with a monitoring port, which is connected to a pressure sensor and a pressure regulating assembly (4). The pressure sensor and the pressure regulating assembly (4) are connected to the microcontroller. The ventilation assembly (2) includes a ventilation pipe (21). The inlet and outlet are respectively equipped with on / off valves. The vent pipe (21) is connected to the pressure regulating component (4) through a diversion valve and a diversion pipe (22). A flow regulating valve is installed in the middle of the vent pipe (21). The vent pipes (21) before and after the flow regulating valve are connected to the heating component (3). The heating component (3) includes a heating pipe (31) connected to the flow regulating valve. The heating pipe (31) is connected to a heating tank (32). The heating tank (32) has a built-in electric heating coil (33). The heating tank (32) is equipped with a cooling tank (35) and is connected to a spiral heat-conducting plate (34). The cooling tank (35) is connected to the pressure regulating component (4) through a return pipe (36) and is provided with a compressor and an on / off valve. The cooling tank (35) is connected to a cooling pipe (38) extending into the heating tank (32). A flow regulating valve and an on / off valve are provided between the cooling pipe (38) and the cooling tank (35). The cooling pipe (38) is connected to a hollow, spiral cooling plate (37). The cooling plate (37) is bonded to the heat-conducting plate (34) and a thermoelectric film is pressed between them. The thermoelectric film is connected to the microcontroller through a digital-to-analog converter. The pressure regulating component (4) includes a buffer tank (41). The buffer tank (41) has a built-in elastic buffer element (42). The buffer tank (41) is connected to the return pipeline (36) and the pressure dividing pipeline (43). The pressure dividing pipeline (43) is connected to an external gas tank through an air filling pipeline (44) and a compressor. The buffer tank (41) is connected to a pressure relief valve through a pressure relief pipeline (45).

2. A control method with dual temperature sensors, employing the insufflator with dual temperature sensors described in claim 1, characterized in that, Includes the following steps: S1: The insufflator is powered on and the system initializes and enters standby mode; S2: The insufflator starts heating and the main unit enters the heating state. If heating is successful, proceed to step S3; otherwise, return to standby state. S3: The host automatically identifies the two temperature sensors through the single bus protocol. If the identification is successful, proceed to step S4; otherwise, return to standby mode. S4: After successful identification, acquire signals from the two temperature sensors respectively; S5: Perform data processing; S6: Output the corresponding PWM signal to control the heating component (3) to maintain a constant temperature.

3. The control method with dual temperature sensors according to claim 2, characterized in that, Step S3 includes the following steps: S31: Scan the temperature sensor and obtain its inherent ROM serial number. If the ROM serial number is not obtained, proceed to step S34; otherwise, proceed to step S32. S32: After matching the ROM serial number, the temperature is read; S33: Perform difference processing on the data acquired by the two temperature sensors. If the difference is ≤2℃, the two temperature sensors are determined to be working normally and the subsequent data acquisition is initiated. Otherwise, the temperature sensors are determined to be abnormal and the process proceeds to step S34. S34: The main unit displays a temperature sensor malfunction message and stops heating.

4. The control method with dual temperature sensors according to claim 2, characterized in that, Step S4 includes the following steps: S41: Read the temperature sensor signal to obtain the data sequence; S42: Determine whether the number of samples meets the standard. If yes, proceed to step S43; otherwise, return to step S41. S43: Perform digital filtering on the data sequence to obtain the data to be processed.

5. The control method with dual temperature sensors according to claim 2, characterized in that, Step S4 includes the following steps: S44: Read data from the temperature sensor N times consecutively; S45: Sort N data points from smallest to largest and remove extreme values; S46: Calculate the average of the remaining N-2 data points to obtain the data to be processed.

6. The control method with dual temperature sensors according to claim 2, characterized in that, Step S5 includes the following steps: S51: Compare the collected data with the set value; S52: If the collected data is less than the set value, the PWM output duty cycle increases after PID processing, and the heating power increases until the set value is reached; if the collected data is greater than or equal to the set value, the PWM output duty cycle decreases after PID processing, and the heating power decreases until no heating is performed, and the host active heat dissipation reaches the set value.

Images