Ablation protective sheath and control method thereof

Abstract

The invention relates to the technical field of ablation protective sheaths, and discloses an ablation protective sheath and a control method thereof.The ablation protective sheath comprises a sheath body and a plugging device, the sheath body is provided with a main channel, a temperature measuring channel, a cooling liquid channel and a negative pressure channel, the temperature measuring channel, the cooling liquid channel and the negative pressure channel are arranged around the main channel, the plugging device is arranged in the main channel in a penetrating mode, and the end, away from the near end, of the plugging device forms an expansion part and is driven to expand so that a heat preservation area can be formed between the expansion part and the far end. The heat preservation area is formed by the plugging device and the sheath body, medical staff can measure the temperature of the heat preservation area in real time through the temperature measuring channel, and heat radiation damage is avoided; meanwhile, normal saline in the heat preservation area can be updated through the cooling liquid channel and the negative pressure channel, the pressure cannot be increased while the temperature of the heat preservation area is reduced, and safety is higher.

Description

Technical Field

[0001] This application relates to the field of ablation protection sheath technology, and in particular to an ablation protection sheath and its control method. Background Technology

[0002] Thermal ablation is a minimally invasive treatment that uses localized high temperatures to induce irreversible cell necrosis, thereby eradicating or destroying tumor tissue. Its main principle is to use energy sources such as radiofrequency, microwave, or laser to heat the tumor tissue and its surrounding safe boundaries to a lethal temperature (usually above 60°C), inducing cell death within a short period. Thermal ablation has advantages such as minimal trauma, rapid recovery, and broad applicability, and is widely used in the treatment of various solid tumors, especially in the ablation of liver tumors close to the bile duct and kidney tumors close to the renal pelvis.

[0003] For thermal ablation of kidney tumors, two methods are commonly used clinically to avoid thermal damage to the renal pelvis and ureter: one is to place a thermometer needle next to the tumor, and the other is to use a nephrostomy catheter for saline injection. However, the former has a lower rate of complete tumor ablation than the latter, and the latter's continuous injection of saline can put enormous pressure on the bladder, resulting in low safety. Furthermore, because the latter cannot measure temperature in real time, the timing of injecting cooling fluid requires judgment from an experienced physician, and misjudgment can easily lead to thermal radiation damage and medical accidents.

[0004] In conclusion, existing biliary and renal pelvis thermal ablation techniques still face many challenges in practical applications and require further optimization and improvement to enhance treatment efficacy and safety. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention forms an insulation zone by using a sealing device and a sheath. Medical personnel can monitor the temperature of this insulation zone in real time through a temperature measurement channel to avoid thermal radiation damage. At the same time, the saline solution in the insulation zone can be replenished through a coolant channel and a negative pressure channel, which lowers the temperature of the insulation zone without increasing the pressure, making it safer.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a protective sheath for bile duct and renal pelvis ablation, comprising: a sheath body having a proximal end and a distal end opposite to each other, wherein the sheath body is respectively provided with a main channel, a temperature measuring channel, a coolant channel and a negative pressure channel with openings at both ends located at the proximal end and the distal end, and the temperature measuring channel, the coolant channel and the negative pressure channel are arranged around the main channel, wherein the main channel, the temperature measuring channel, the coolant channel and the negative pressure channel are respectively used for inserting a guide wire, inserting a temperature sensor, introducing coolant and discharging coolant;

[0007] A sealing device is inserted into the main channel. The end of the sealing device facing away from the proximal end forms an expansion portion and is driven to expand, so that an insulation zone is formed between the expansion portion and the distal end.

[0008] A temperature controller is separately disposed from the sheath. The temperature controller increases the coolant flow rate of the coolant channel and the negative pressure channel when the temperature at the far end opening of the temperature measuring channel is greater than a preset temperature; and decreases the coolant flow rate of the coolant channel and the negative pressure channel when the temperature at the far end opening of the temperature measuring channel is less than the preset temperature.

[0009] Furthermore, the bile duct and renal pelvis ablation protective sheath also includes: a temperature sensor, which is disposed on the temperature measurement channel facing the distal end;

[0010] A coolant pump, which is connected to the proximal opening of the coolant channel, is used to inject coolant into the insulation zone through the coolant channel;

[0011] A negative pressure pump is connected to the proximal opening of the negative pressure channel, and the negative pressure pump is used to discharge the coolant in the insulation zone through the negative pressure channel;

[0012] The temperature sensor, the coolant pump, and the negative pressure pump are all electrically connected to the temperature controller.

[0013] Specifically, when the temperature detected by the temperature sensor is higher than the preset temperature, the temperature controller increases the operating power of the coolant pump and the negative pressure pump; when the temperature detected by the temperature sensor is lower than the preset temperature, the temperature controller decreases the operating power of the coolant pump and the negative pressure pump.

[0014] Furthermore, the bile duct and renal pelvis ablation protective sheath also includes: a pressure sensor, wherein the pressure sensor and the temperature sensor are respectively disposed at the distal opening of the temperature measurement channel and electrically connected to the temperature controller;

[0015] Specifically, when the pressure detected by the pressure sensor is greater than the preset pressure, the temperature controller controls to increase the operating power of the negative pressure pump and / or decrease the operating power of the coolant pump; when the pressure detected by the pressure sensor is less than the preset pressure, the temperature controller decreases the operating power of the negative pressure pump and / or increases the operating power of the coolant pump.

[0016] Furthermore, the occlusion device includes: a guide wire body, the guide wire body being inserted into the main channel, with one end extending from the proximal end and the other end extending from the distal end;

[0017] An expansion section is connected to the guidewire body and is expanded by a drive.

[0018] Furthermore, the expansion portion includes an air bladder portion, the guidewire body has a gas channel, and the air bladder portion communicates with the gas channel.

[0019] Furthermore, the cross-sectional shape of the temperature measuring channel, the coolant channel, and the negative pressure channel are all arc-shaped, and the center of the arc of the temperature measuring channel, the coolant channel, and the negative pressure channel coincides with the center of the circle of the main channel.

[0020] Furthermore, the cross-sectional area of ​​the coolant channel is the same as that of the negative pressure channel, and the cross-sectional area of ​​the temperature measuring channel is smaller than that of the coolant channel.

[0021] Furthermore, the Shore A hardness of the sheath is between 30A and 50A.

[0022] Furthermore, the bile duct and renal pelvis ablation protective sheath also includes: a plurality of side holes, which are disposed on the outer surface of the distal end and are respectively connected to the coolant channel.

[0023] A control method for a bile duct and renal pelvis ablation protective sheath as described above includes the following steps: setting a preset temperature at the distal opening of the temperature measuring channel, a preset flow rate of the coolant channel, and a preset flow rate of the negative pressure channel, wherein the preset flow rate of the coolant channel and the preset flow rate of the negative pressure channel are the same.

[0024] When the temperature at the far end opening of the temperature measuring channel is greater than the preset temperature, the flow rate of the coolant channel and the negative pressure channel is increased;

[0025] When the temperature at the far end opening of the temperature measuring channel is lower than the preset temperature, the flow rate of the coolant channel and the negative pressure channel is reduced.

[0026] Beneficial effects: This invention forms an insulation zone with the sheath through the sealing device, allowing medical staff to measure the temperature of the insulation zone in real time through the temperature measurement channel, thus avoiding thermal radiation damage; at the same time, the saline solution in the insulation zone can be renewed through the coolant channel and the negative pressure channel, which lowers the temperature of the insulation zone without increasing the pressure, making it safer. Attached Figure Description

[0027] Figure 1 A schematic diagram of the structure of the bile duct and renal pelvis ablation protective sheath provided by the present invention;

[0028] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A;

[0029] Figure 3 A cross-sectional view of the bile duct and renal pelvis ablation protective sheath provided by the present invention;

[0030] Figure 4 A schematic diagram of the structure of the bile duct and renal pelvis ablation protective sheath provided in another embodiment;

[0031] Figure 5 The circuit connection diagram provided for this invention.

[0032] The labels in the attached diagram are as follows: 100, sheath; 101, proximal end; 102, distal end; 103, side hole; 210, main channel; 220, temperature measurement channel; 230, coolant channel; 240, negative pressure channel; 300, sealing device; 310, guide wire body; 311, gas channel; 320, expansion section; 321, air bladder section; 410, temperature sensor; 420, coolant pump; 430, negative pressure pump; 440, temperature controller; 450, pressure sensor; 460, air pump; 470, control panel; 480, display screen. Detailed Implementation

[0033] This invention provides an ablation protective sheath and its control method. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should also be noted that the same or similar reference numerals in the accompanying drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] The invention will be further explained below with reference to the accompanying drawings and the description of the embodiments.

[0038] This embodiment provides an ablation protective sheath and its control method, such as Figures 1 to 5 As shown, to solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: it includes a sheath 100 and a sealing device 300. The sheath 100 has a proximal end 101 (the upper end in the figure, which is close to the user during use) and a distal end 102 (the lower end, which is away from the user during use) that are opposite to each other. The sheath 100 is respectively provided with a main channel 210, a temperature measuring channel 220, a coolant channel 230 and a negative pressure channel 240. The temperature measuring channel 220, the coolant channel 230 and the negative pressure channel 240 are all arranged around the main channel 210, and the two ends of the main channel 210, the temperature measuring channel 220, the coolant channel 230 and the negative pressure channel 240 are located at the upper end and the lower end, respectively. Therefore, the user inserts the instrument through the corresponding channel into the upper end opening and out through the lower end opening. The sealing device 300 is installed inside the main channel 210. The lower end of the sealing device 300 forms an expansion part 320 and is driven to expand, thereby forming a heat preservation zone between the expansion part 320 and the lower end of the sheath 100.

[0039] The main channel 210, temperature measuring channel 220, coolant channel 230, and negative pressure channel 240 are used for inserting the guide wire, inserting the temperature sensor 410, introducing coolant, and draining coolant, respectively. In actual use, the user can insert the temperature sensor 410 into the temperature measuring channel 220 to measure the temperature of the insulation area in real time, avoiding overheating of the insulation area and causing heat radiation damage to the patient. At the same time, coolant (physiological saline) can be injected into the insulation area through the coolant channel 230 and drained through the negative pressure channel 240, thereby refreshing the coolant (physiological saline) in the insulation area and reducing the temperature in the insulation area. This achieves the goal of reducing the temperature of the insulation area without increasing the pressure in the insulation area, making it safer.

[0040] Temperature controller 440 is separately installed from sheath 100. Through temperature controller 440, when the temperature at the opening of temperature measuring channel 220 at the far end 102 is greater than the preset temperature, the coolant flow rate of coolant channel 230 and negative pressure channel 240 is increased; when the temperature at the opening of temperature measuring channel 220 at the far end 102 is less than the preset temperature, the coolant flow rate of coolant channel 230 and negative pressure channel 240 is reduced, thereby realizing the control of temperature in the insulation zone.

[0041] In one embodiment, such as Figures 1 to 3 , Figure 5 As shown, the bile duct and renal pelvis ablation protective sheath further includes: a temperature sensor 410, a coolant pump 420, and a negative pressure pump 430, which are electrically connected to a temperature controller 440. The temperature sensor 410 is preferably made of Pt100. The temperature controller 440, coolant pump 420, and negative pressure pump 430 are separately disposed from the sheath body 100 and are detachably connected to the temperature sensor 410 via wires.

[0042] The temperature sensor 410 extends from the upper opening of the temperature measuring channel 220 to the lower opening, and is used to measure the temperature in the insulation zone; the coolant pump 420 is connected to the upper opening of the coolant channel 230, and is used to inject physiological saline into the insulation zone through the coolant channel 230; the negative pressure pump 430 is connected to the upper opening of the negative pressure channel 240, and is used to discharge the physiological saline in the insulation zone through the negative pressure channel 240.

[0043] In actual use, such as Figure 5 As shown, the temperature controller 440 can receive signals from the temperature sensor 410 to determine whether the temperature in the insulation zone is within a preset temperature or a preset temperature range. When the temperature detected by the temperature sensor 410 is greater than the preset temperature or the preset temperature range, it can be determined that the temperature in the insulation zone is overheated. The flow rate of the coolant channel 230 and the negative pressure channel 240 can be increased by increasing the operating power of the coolant pump 420 and the negative pressure pump 430, thereby increasing the renewal rate of the saline solution in the insulation zone and thus reducing the temperature of the saline solution in the insulation zone. When the temperature detected by the temperature sensor 410 is less than the preset temperature or the preset temperature range, it can be determined that the temperature in the insulation zone is too low. The flow rate of the coolant channel 230 and the negative pressure channel 240 can be reduced by decreasing the operating power of the coolant pump 420 and the negative pressure pump 430, thereby reducing the renewal rate of the saline solution in the insulation zone, or the coolant pump 420 and the negative pressure pump 430 can be directly turned off to maintain the temperature of the saline solution in the insulation zone. It should be noted that the temperature of the saline solution can be equal to or lower than the preset temperature or the preset temperature range, but it should not be too low to avoid irritating the patient.

[0044] In one embodiment, such as Figures 1 to 3 As shown, the bile duct and renal pelvis ablation protective sheath also includes: a pressure sensor 450, which and a temperature sensor 410 are respectively disposed at the distal end 102 opening of the temperature measurement channel 220 and electrically connected to the temperature controller 440. The pressure sensor 450 and the temperature sensor 410 are interconnected to form a probe, such as the temperature sensor 410 being located at the lower end of the pressure sensor 450.

[0045] In practical use, such as Figure 5 As shown, the temperature controller 440 can receive signals from the pressure sensor 450 to determine whether the pressure in the insulation zone is within a preset pressure or preset pressure range. When the pressure detected by the pressure sensor 450 is greater than the preset pressure or preset pressure range, it can be determined that the pressure in the insulation zone is too high. The pressure can be reduced by increasing the operating power of the negative pressure pump 430 and / or decreasing the operating power of the coolant pump 420 to decrease the amount of saline solution in the insulation zone. Conversely, when the pressure detected by the pressure sensor 450 is less than the preset pressure or preset pressure range, it can be determined that the pressure in the insulation zone is too low. The pressure can be increased by decreasing the operating power of the negative pressure pump 430 and / or increasing the operating power of the coolant pump 420 to increase the amount of saline solution in the insulation zone. It should be noted that the preset pressure can be adjusted according to actual needs.

[0046] In one embodiment, such as Figure 5 As shown, it also includes a control panel 470 and a display screen 480. The control panel 470 can be used to input preset temperature / preset temperature range and preset pressure / preset pressure range, and the display screen 480 can display the current temperature and current pressure of the insulation zone.

[0047] In one embodiment, such as Figure 1 , Figure 3 , Figure 4 As shown, the sealing device 300 includes a guide wire body 310 and an expansion section 320. The guide wire body 310 is made of the same material as existing guide wires, facilitating its insertion through the upper opening and exit through the lower opening of the main channel 210. The expansion section 320 is connected to the guide wire body 310 and expands under drive. In practical use, the range of the insulation zone can be adjusted by adjusting the position of the expansion section 320.

[0048] In one embodiment, such as Figure 1 , Figure 3 , Figure 4 As shown, the expansion portion 320 includes: an air bladder portion 321, and the guidewire body 310 has a gas channel 311, with the air bladder portion 321 communicating with the gas channel 311. Preferably, as... Figure 5As shown, it also includes an air pump 460, which is connected to the airbag 321 via a gas channel 311. In actual use, the user can adjust the inflation level of the airbag through the air pump 460. Preferably, a pressure probe is also provided to detect the air pressure in the airbag or the gas channel 311, so as to avoid excessive pressure causing damage to the patient.

[0049] In one embodiment, such as Figures 1 to 3 As shown, the cross-sectional shape of the temperature measuring channel 220, the coolant channel 230 and the negative pressure channel 240 are all arc-shaped, and the arc center of the temperature measuring channel 220, the coolant channel 230 and the negative pressure channel 240 coincides with the center of the main channel 210, minimizing the impact on the shape and size of the main channel 210, and increasing its function without affecting the use of existing guide wires and other instruments.

[0050] In one embodiment, such as Figures 1 to 3 As shown, the cross-sectional area of ​​the coolant channel 230 is the same as that of the negative pressure channel 240, and the cross-sectional area of ​​the temperature measuring channel 220 is smaller than that of the coolant channel 230.

[0051] In one embodiment, the Shore A hardness of the sheath 100 is between 30A and 50A. The sheath 100 is preferably made of plastic, similar to a medical tubing. Because the mucosa inside the bile duct and renal pelvis is relatively fragile, limiting the hardness of the sheath 100 can reduce the risk of biliary bleeding and hematuria.

[0052] In one embodiment, such as Figure 4 As shown, the bile duct and renal pelvis ablation protection sheath also includes: a plurality of side holes 103, which are disposed on the outer surface of the distal end 102 and are respectively connected to the coolant channel 230 to avoid insufficient coolant supply due to blockage of the distal end 102 opening.

[0053] A control method for any of the above-mentioned bile duct and renal pelvis ablation protective sheaths includes the following steps: setting a preset temperature at the distal opening 102 of the temperature measuring channel 220, a preset flow rate of the coolant channel 230, and a preset flow rate of the negative pressure channel 240, wherein the preset flow rate of the coolant channel 230 and the preset flow rate of the negative pressure channel 240 are the same.

[0054] When the temperature at the far end 102 opening of the temperature measuring channel 220 is greater than the preset temperature, the flow rate of the coolant channel 230 and the negative pressure channel 240 is increased.

[0055] When the temperature at the opening of the temperature measuring channel 220 at the far end 102 is lower than the preset temperature, the flow rate of the coolant channel 230 and the negative pressure channel 240 is reduced.

[0056] In summary, this application relates to the field of ablation protection sheath technology, and discloses an ablation protection sheath and its control method. The sheath includes a sheath body and a sealing device. The sheath body has a main channel, a temperature measuring channel, a coolant channel, and a negative pressure channel with openings at both ends, respectively. The temperature measuring channel, coolant channel, and negative pressure channel are arranged around the main channel. The sealing device is inserted into the main channel, and the end of the sealing device facing away from the proximal end forms an expansion portion that expands under drive, creating a heat-insulating zone between the expansion portion and the distal end. This invention forms a heat-insulating zone through the sealing device and the sheath body. Medical personnel can monitor the temperature of the heat-insulating zone in real time through the temperature measuring channel, avoiding thermal radiation damage. Simultaneously, the saline solution in the heat-insulating zone can be replenished through the coolant channel and negative pressure channel, reducing the temperature of the heat-insulating zone without increasing the pressure, thus enhancing safety.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective sheath for bile duct and renal pelvis ablation, characterized in that, include: The sheath has a proximal end and a distal end, and the sheath is provided with a main channel, a temperature measuring channel, a coolant channel, and a negative pressure channel, with the openings at both ends located at the proximal end and the distal end, respectively. The temperature measuring channel, the coolant channel, and the negative pressure channel are arranged around the main channel. The main channel, the temperature measuring channel, the coolant channel, and the negative pressure channel are used for inserting a guide wire, inserting a temperature sensor, introducing coolant, and discharging coolant, respectively. A sealing device is inserted into the main channel. The end of the sealing device facing away from the proximal end forms an expansion portion and is driven to expand, so that an insulation zone is formed between the expansion portion and the distal end. A temperature controller is separately disposed from the sheath. The temperature controller increases the coolant flow rate of the coolant channel and the negative pressure channel when the temperature at the far end opening of the temperature measuring channel is greater than a preset temperature; and decreases the coolant flow rate of the coolant channel and the negative pressure channel when the temperature at the far end opening of the temperature measuring channel is less than the preset temperature.

2. The bile duct and renal pelvis ablation protective sheath according to claim 1, characterized in that, The bile duct and renal pelvis ablation protective sheath further includes: a temperature sensor, which is disposed on the temperature measurement channel facing the distal end; A coolant pump, which is connected to the proximal opening of the coolant channel, is used to inject coolant into the insulation zone through the coolant channel; A negative pressure pump is connected to the proximal opening of the negative pressure channel, and the negative pressure pump is used to discharge the coolant in the insulation zone through the negative pressure channel; The temperature sensor, the coolant pump, and the negative pressure pump are all electrically connected to the temperature controller. Specifically, when the temperature detected by the temperature sensor is higher than the preset temperature, the temperature controller increases the operating power of the coolant pump and the negative pressure pump; when the temperature detected by the temperature sensor is lower than the preset temperature, the temperature controller decreases the operating power of the coolant pump and the negative pressure pump.

3. The bile duct and renal pelvis ablation protective sheath according to claim 2, characterized in that, The bile duct and renal pelvis ablation protective sheath further includes: a pressure sensor, wherein the pressure sensor and the temperature sensor are respectively disposed at the distal opening of the temperature measurement channel and are electrically connected to the temperature controller; Specifically, when the pressure detected by the pressure sensor is greater than the preset pressure, the temperature controller controls to increase the operating power of the negative pressure pump and / or decrease the operating power of the coolant pump; when the pressure detected by the pressure sensor is less than the preset pressure, the temperature controller decreases the operating power of the negative pressure pump and / or increases the operating power of the coolant pump.

4. The bile duct and renal pelvis ablation protective sheath according to claim 1, characterized in that, The occlusion device includes: a guide wire body, which is inserted into the main channel, with one end extending from the proximal end and the other end extending from the distal end; An expansion section is connected to the guidewire body and is expanded by a drive.

5. The bile duct and renal pelvis ablation protective sheath according to claim 4, characterized in that, The expansion section includes an air bladder section, the guidewire body has a gas channel, and the air bladder section is connected to the gas channel.

6. The bile duct and renal pelvis ablation protective sheath according to claim 1, characterized in that, The temperature measuring channel, the coolant channel, and the negative pressure channel all have arc-shaped cross-sections, and the center of the arc of the temperature measuring channel, the coolant channel, and the negative pressure channel coincides with the center of the main channel.

7. The bile duct and renal pelvis ablation protective sheath according to claim 1, characterized in that, The cross-sectional area of ​​the coolant channel is the same as that of the negative pressure channel, and the cross-sectional area of ​​the temperature measuring channel is smaller than that of the coolant channel.

8. The ablation protective sheath for the bile duct and renal pelvis according to claim 1, characterized in that, The Shore A hardness of the sheath is between 30A and 50A.

9. The bile duct and renal pelvis ablation protective sheath according to claim 1, characterized in that, The bile duct and renal pelvis ablation protective sheath further includes: a plurality of side holes, which are disposed on the outer surface of the distal end and are respectively connected to the coolant channel.

10. A method for controlling the ablation protective sheath of the biliary tract and renal pelvis as described in any one of claims 1-9, characterized in that, The process includes the following steps: setting the preset temperature at the far end opening of the temperature measuring channel, the preset flow rate of the coolant channel, and the preset flow rate of the negative pressure channel, wherein the preset flow rate of the coolant channel and the preset flow rate of the negative pressure channel are the same; When the temperature at the far end opening of the temperature measuring channel is greater than the preset temperature, the flow rate of the coolant channel and the negative pressure channel is increased; When the temperature at the far end opening of the temperature measuring channel is lower than the preset temperature, the flow rate of the coolant channel and the negative pressure channel is reduced.

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