Ablation system and temperature control method thereof

Abstract

The present application relates to a kind of ablation system and its temperature control method, it is related to cold and hot ablation technical field.The temperature control method of the ablation system of the present application, by respectively controlling the speed of the first state working medium input to the input side of ablation instrument, the pressure of the second state working medium in back pressure control unit and the flow of the third state working medium in working medium distribution unit, it can meet the requirement of different control strategy for different state working medium respectively, to realize the purpose of more accurate temperature control.

Description

[0001] This case is a divisional application of Chinese patent CN202210956382.X, Ablation System and Temperature Control Method Thereof. Technical Field

[0002] This invention relates to the field of thermal ablation technology, and particularly to an ablation system and its temperature control method. Background Technology

[0003] In the experimentation and testing of ablation systems, precise temperature control of the working fluid within the ablation device is necessary to achieve optimal heat exchange. Current temperature control methods for ablation systems do not provide different control schemes for the working fluid in different states within the ablation system; therefore, existing temperature control methods need improvement. Summary of the Invention

[0004] This invention provides an ablation system and its temperature control method, which are used to adopt different control strategies for the working fluid in different states in the ablation system, thereby achieving more precise temperature control.

[0005] According to a first aspect of the present invention, the present invention provides a temperature control method for an ablation system, comprising: Includes one or more of the following steps: S1: Adjust the speed of the first state working fluid input from the power unit to the input side of the ablation device to change the temperature of the ablation device; S2: Adjust the pressure of the second-state working fluid in the back pressure control unit connected to the reflux side of the ablation device to change the temperature of the ablation device; S3: Adjust the flow rate of the third-state working fluid in the working fluid distribution unit, which is connected to the input side of the power unit and the ablation device respectively, to change the temperature of the ablation device.

[0006] In one embodiment, in step S1, the temperature of the ablation device is changed by adjusting the opening and closing state of the first valve mechanism of the power unit to change the speed at which the working fluid delivered by the power unit to the input side of the ablation device.

[0007] In one embodiment, the first valve mechanism includes a booster valve, a control valve, and a first vent valve, all of which are connected to the power unit. In step S1, the opening and closing state of one or more of the pressure boosting valve, the regulating valve, and the first venting valve is adjusted according to whether the temperature of the ablation device is lower than the set temperature.

[0008] In one implementation, step S1 includes the following sub-steps: S101: Determine whether the temperature of the ablation device is lower than the set temperature. T1. If yes, proceed to step S102; otherwise, the duration is... t After step 1, return to step S101; S102: Determine whether the temperature of the ablation device is lower than the second temperature. T 2. If yes, proceed to step S103; if no, proceed to step S104. S103: Determine whether the pressure inside the power unit is higher than the first pressure. P 1. If so, record the current pressure within the power unit. P 11 1. Open the first vent valve and execute step S105; 2. If not, record the current pressure in the power unit. P 12 Open the control valve and execute step S106; S104: Determine whether the temperature of the ablation device is higher than the third set temperature. T 3. If so, record the current pressure within the power unit. P 14 1. Open the control valve and execute step S107; otherwise, the duration is... t 2. Then return to step S102; S105: Determine whether the pressure inside the current power unit is lower than the second pressure. P 2. If yes, then close the first vent valve and execute step S108; if no, then the duration... t After step 3, return to step S105; S106: Determine whether the pressure inside the current power unit is lower than the third pressure. P 3. If yes, then close the control valve and execute step S108; if no, then the duration... t After step 3, return to step S106; S107: Determine whether the pressure inside the power unit is higher than the fourth pressure. P 4. If yes, then close the pressure boosting valve and execute step S108; if no, then the duration... t After step 3, return to step S107; S108: Duration t After step 1, return to step S102.

[0009] In one implementation, the second pressure P 2 and the current pressure within the power unit P 11 The following relation (1) must be satisfied: P 2= C 1· P 11 (1) Third pressure P 3. The current pressure within the power unit (100) P 12 The following relation (2) must be satisfied: P 3= C 2· P 12 (2) Fourth pressure P 4. Current pressure within the power unit (100) P 14 The following relation (3) must be satisfied: P 4= C 3· P 14 (3) in, C 1. C 2 and C 3 represents the proportionality coefficient.

[0010] In one embodiment, the back pressure control unit includes a second pressure vessel connected to the reflux side of the ablation device and a proportional relief valve connected to the second pressure vessel; In step S2, the pressure difference between the reflux side and the input side of the ablation device is adjusted by the proportional overflow valve, thereby changing the temperature, pressure or flow rate of the second state working fluid in the back pressure control unit, so as to change the temperature of the ablation device.

[0011] In one implementation, step S2 includes the following sub-steps: S201: Determine whether the temperature of the ablation device is lower than the set temperature. T 1. If yes, proceed to step S202; otherwise, the duration is... t After step 1, return to step S201; S202: Determine whether the temperature of the ablation device is lower than the second temperature. T 2. If yes, proceed to step S203; if no, proceed to step S204. S203: By adjusting the opening degree of the proportional relief valve, the pressure inside the second pressure vessel is made to reach... P 5. And proceed to step S206; S204: Determine whether the temperature of the ablation device (400) is higher than the third temperature. T 3. If yes, proceed to step S205; otherwise, the duration is... t 2. Then return to step S201; S205: By adjusting the opening degree of the proportional relief valve (902), the pressure inside the second pressure vessel (901) is made to reach... P 6. And execute step S206; S206: Duration t After step 1, return to step S202.

[0012] In one implementation, the fifth pressure P 5 and the current pressure inside the second pressure vessel (901) P 21 The following relation (4) must be satisfied: P 5= C 3· P 21 (4) Sixth pressure P 6 and the current pressure inside the second pressure vessel (901) P 22 The following relation (5) must be satisfied: P 6= C 2· P 22 (5) in, C 2 and C 3 represents the proportionality coefficient.

[0013] In one embodiment, the working fluid distribution unit includes: Thermal valves are connected to the power unit and the front heat exchange device, respectively. A cooling valve is connected to the input side of both the power unit and the ablation device. A flow regulating valve is connected to the input side of both the preheating device and the ablation instrument. Specifically, by opening the hot valve and the cold valve respectively, and adjusting the opening degree of the flow regulating valve, the flow rate, temperature and pressure of the third-state working fluid in the working fluid distribution unit are adjusted, thereby changing the temperature of the ablation device.

[0014] In one implementation, step S3 includes the following sub-steps: S301: Determine whether the temperature of the ablation device is lower than the set temperature. T 1. If yes, proceed to step S302; otherwise, the duration is... t After step 1, return to step S301; S302: Open the thermal valve and adjust the opening of the flow control valve to the initial opening. K 0, duration t 5. Then proceed to step S303; S303: Determine whether the temperature of the ablation device is lower than the set temperature. T 2. If yes, proceed to step S304; if no, proceed to step S305. S304: Increase the opening degree of the flow control valve to K 1. And execute step S307; S305: Determine whether the temperature of the ablation device is higher than the set temperature. T 3. If yes, proceed to step S306; otherwise, the duration is... t 2. Then return to step S303; S306: Reduce the opening of the flow control valve to K 2. And execute step S307; S307: Duration t After step 5, return to step S303.

[0015] According to a second aspect of the present invention, an ablation system is provided for controlling the temperature of an ablation device by means of a temperature control method of the ablation system.

[0016] According to a third aspect of the present invention, the present invention provides an ablation system comprising: A power unit, which stores and supplies the working fluid; and The working fluid distribution unit includes a first delivery pipeline and a second delivery pipeline; The first delivery pipeline is connected to the power unit and is used to deliver the working fluid for cryogenic operation; The second delivery pipeline is connected to the first delivery pipeline, and a working fluid temperature control unit for adjusting the working fluid temperature is connected to the second delivery pipeline. The working fluid temperature control unit is used to adjust the temperature of the working fluid in the second delivery pipeline so that it can perform high-temperature operation. The working medium used for high-temperature operation and the working medium used for low-temperature operation are different phases of the same substance.

[0017] In one embodiment, the device further includes an ablation apparatus, wherein the first delivery line and the second delivery line are connected in parallel, the first junction of the first delivery line and the second delivery line is connected to the output line of the power unit, and the second junction of the first delivery line and the second delivery line is connected to the ablation apparatus via an insulated line.

[0018] In one embodiment, the temperature control method of the ablation system according to the present invention is characterized in that a cold valve is provided at the first junction of the first delivery pipeline and the second delivery pipeline, the cold valve enabling the output pipeline of the power unit to be connected to the first delivery pipeline or the second delivery pipeline.

[0019] In one embodiment, the temperature control method of the ablation system according to the present invention is characterized in that the working fluid temperature control unit includes a pre-heat dissipation device and a working fluid stabilization device connected in series on the second delivery pipeline. The pre-heat dissipation device adjusts the working fluid to raise its temperature to a first temperature, and the working fluid stabilization device adjusts the working fluid at the first temperature to raise its temperature to a second temperature for high-temperature operation.

[0020] In one embodiment, the temperature control method of the ablation system according to the present invention is characterized in that the pre-heat exchange device includes a first heat exchanger and a first fan connected to the second delivery pipeline, the first heat exchanger is provided with an air heat exchange path, the working fluid in the second delivery pipeline exchanges heat with air in the air heat exchange path through convection, and the first fan accelerates the heat convection in the air heat exchange path.

[0021] In one embodiment, the temperature control method for the ablation system according to the present invention is characterized in that the working fluid stabilization device includes a heater, the heater including an energy storage body, a heating component for heating the energy storage body, and a temperature sensing element disposed on the energy storage body. The energy storage body is provided with a heat exchange path, and the working fluid output from the first heat exchanger exchanges heat in the heat exchange path.

[0022] In one embodiment, the temperature control method of the ablation system according to the present invention is characterized in that the heater further includes a temperature switch and an over-temperature interruptor connected to the heating element, both of which can stop the heating element from heating.

[0023] In one embodiment, the temperature control method of the ablation system according to the present invention is characterized in that a phase separation device is connected in series on the first delivery pipeline, the gas output side of the phase separation device is respectively connected to a normally open separation pipeline and a regulating separation pipeline, and the liquid output side of the phase separation device is connected to the insulated pipeline.

[0024] In one embodiment, the temperature control method of the ablation system according to the present invention is characterized in that the power unit includes a first pressure vessel storing a working fluid, and the first pressure vessel is respectively provided with a first safety valve, a regulating valve and a first venting valve, the first safety valve being connected to a control and emission unit through a silencer, and the regulating valve and the first venting valve being connected to the control and emission unit.

[0025] In one embodiment, the temperature control method for the ablation system according to the present invention is characterized in that the controlled emission unit comprises: The second heat exchanger is connected to the normally open separation pipeline and the control separation pipeline on the gas output side of the phase separation device. A third heat exchanger is connected to the silencer, the regulating valve, the first vent valve, and the output side of the ablation device, respectively; and A multi-hole ventilation device is connected to the first heat exchanger and the second heat exchanger respectively.

[0026] Compared with the prior art, the advantage of the present invention is that by controlling the speed of the first state working fluid input to the input side of the ablation device, the pressure of the second state working fluid in the back pressure control unit, and the flow rate of the third state working fluid in the working fluid distribution unit respectively, the requirements of adopting different control strategies for working fluids in different states can be met, thereby achieving the purpose of more precise temperature control. Attached Figure Description The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0027] Figure 1 This is an external structural diagram of the temperature control method of the ablation system in an embodiment of the present invention; Figure 2 This is a principle block diagram of the temperature control method of the ablation system in an embodiment of the present invention; Figure 3 and Figure 4 The temperature control method of the ablation system in the embodiments of the present invention hides the three-dimensional view of the outer shell; Figure 5 This is a perspective view of the power unit in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the power unit in an embodiment of the present invention; Figure 7 This is a perspective view of the working fluid temperature control unit in an embodiment of the present invention; Figure 8 This is a perspective view of the insulated pipeline in an embodiment of the present invention; Figure 9a This is a cross-sectional view of the ablation device in an embodiment of the present invention; Figure 9b yes Figure 9a Enlarged view at point I; Figure 10 This is a schematic diagram of the power unit of the ablation system in an embodiment of the present invention; Figure 11 This is a flowchart of the temperature control method of the ablation system in Embodiment 1 of the present invention; Figure 12 This is a schematic diagram of the back pressure control unit in an embodiment of the present invention; Figure 13This is a flowchart of the temperature control method of the ablation system in Embodiment 2 of the present invention; Figure 14 This is a schematic diagram of the working fluid distribution unit in an embodiment of the present invention; Figure 15 This is a flowchart of the temperature control method of the ablation system in Embodiment 3 of this invention.

[0028] Figure label: 100-Power unit; 110-First pressure vessel; 111-First safety valve; 112-Control valve; 113-First vent valve; 114-Silencer; 115-First pressure gauge; 116-Inlet; 117-Filter; 118-Pressure booster valve; 119-First pressure sensor; 120-Level gauge; 122-Third manual valve; 101 - Vacuum layer; 121 - Output Channel; 200 - Working fluid distribution unit; 210 - First delivery pipeline; 220 - Second delivery pipeline; 230 - Cold valve; 240 - Hot valve; 250 - First temperature sensor; 260 - Flow regulating valve; 270 - Third delivery pipeline; 271 - Check valve; 211 - Third temperature sensor; 212 - Second pressure sensor; 300 - Working fluid temperature control unit; 310 - Front heat exchange device; 311 - First heat exchanger; 312 - First fan; 320 - Working fluid stabilizer; 321 - Heater; 322 - Fourth temperature sensor; 400 - Ablation devices; 410 - Insulated pipelines; 500-phase separation device; 510 - Normally open separation line; 511 - First phase separation valve; 512 - First manual valve; 520 - Control and separation pipeline; 521 - Secondary manual valve; 522 - Second phase separation valve; 530 - Second temperature sensor; 600 - Control and emission unit; 610 - Second heat exchanger; 620 - Third heat exchanger; 630 - Perforated ventilation device; 640 - Second fan; 700 - Main frame; 710 - Housing; 720 - Casters; 800 - Interactive system; 810 - Display; 900 - Back pressure control unit; 901 - Second pressure vessel; 902 - Proportional relief valve; 903 - Second vent valve; 904 - Second safety valve; 905 - Second pressure gauge; 906 - Third pressure sensor. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] On the one hand, this invention provides an ablation system. For example... Figures 1-8 as well as Figure 9a and Figure 9b As shown, an ablation system of the present invention includes a power unit 100, a working fluid distribution unit 200, and an ablation device 400. The power unit 100 stores and supplies the working fluid, which can be one or more of the following: liquid nitrogen (boiling point -196°C at ambient pressure), liquid oxygen (boiling point -183°C at ambient pressure), liquid methane (boiling point -161°C at ambient pressure), liquid argon (boiling point -186°C at ambient pressure), liquid neon (boiling point -246°C at ambient pressure), liquid helium (boiling point -269°C at ambient pressure), liquefied nitrous oxide (boiling point -88.5°C at ambient pressure), liquefied carbon dioxide (boiling point -79°C at ambient pressure), and chlorofluorocarbon 22 (boiling point -50°C at ambient pressure). Different working fluids can be selected according to different target requirements. The raw materials for the above-mentioned working fluids are relatively easy to obtain, so they can be easily selected even in second- and third-tier cities.

[0031] like Figure 2 As shown, the working fluid distribution unit 200 is connected to the power unit 100 and the ablation device 400 respectively, and is used to deliver the working fluid in the power unit 100 to the ablation device 400 for corresponding operations.

[0032] Specifically, the working fluid distribution unit 200 includes a first conveying pipeline 210 and a second conveying pipeline 220. The first conveying pipeline 210 is connected to the power unit 100 and is used to convey the working fluid for cryogenic operation. The second conveying pipeline 220 is connected to the first conveying pipeline 210, and a working fluid temperature control unit 300 is connected to the second conveying pipeline 220 to regulate the temperature of the working fluid in the second conveying pipeline 220 so that it can perform high-temperature operation. The working fluid for high-temperature operation and the working fluid for cryogenic operation are different phases of the same substance. That is to say, the working fluid in this application has only one source, namely the power unit 100. The working fluid in the power unit 100 is a cryogenic working fluid, so it can be transported through the first delivery pipeline 210 and directly used for cryogenic operation. When performing high-temperature operation, the cryogenic working fluid is transported through the first delivery pipeline 210 to the second delivery pipeline 220. The working fluid temperature control unit 300 on the second delivery pipeline 220 can raise the temperature of the cryogenic working fluid to a temperature suitable for high-temperature operation. Therefore, the working fluid used for cryogenic operation will be referred to as "cryo working fluid" in the following text, and the working fluid used for high-temperature operation will be referred to as "high-temperature working fluid".

[0033] Taking liquid nitrogen as an example, the first delivery line 210 delivers liquid nitrogen (i.e., cryogenic working medium) to the ablation device 400 for cryogenic operation; when performing high-temperature operation, the first delivery line 210 delivers liquid nitrogen to the second delivery line 220, and the working medium temperature control unit 300 raises the temperature of the liquid nitrogen to become high-temperature nitrogen gas, for example, it can be raised to 100°C or higher, thereby changing the cryogenic working medium into a high-temperature working medium for high-temperature operation.

[0034] Therefore, it can be understood that "low temperature" in this invention refers to a temperature less than or equal to the boiling point of the corresponding working fluid, and "high temperature" refers to a temperature above 20°C.

[0035] Therefore, the working medium used for both low-temperature and high-temperature operations in this invention is the same substance in different phases (e.g., liquid nitrogen as mentioned above, which is in liquid nitrogen form during low-temperature operations and in nitrogen gas form during high-temperature operations). Using the same substance as the working medium not only eliminates the need for components and parts used in the prior art for storing and transporting high-temperature working media, but also facilitates the use and addition of the working medium during surgery, avoiding various negative effects caused by mixing multiple working media. Furthermore, by using the same substance as consumables, this invention allows for temperature control between -196℃ and 100℃, exhibiting a high temperature range, enabling combined high and low temperature operations for complete cell killing; additionally, the maximum temperature can be increased further if special needs arise.

[0036] The ablation device 400 in the temperature control method of the ablation system of the present invention can be, for example, a puncture-type ablation consumable (such as...). Figure 9a and Figure 9b (As shown), surgical ablation consumables such as surgical dressings and surgical clamping ablation consumables are typically 1mm-8mm in diameter. The ablation device 400 allows for the delivery and retrieval of the working fluid within its interior. Its internal flexible tubing allows for easy rotation and bending during use, greatly improving operability during surgery.

[0037] All 400 ablation devices are disposable sterile products, each integrated with an electronic encryption chip, and work in conjunction with the 800 interactive system (such as...). Figure 1 The RFID reader (as shown) can effectively identify and limit the use of disposable sterile products, preventing their repeated use. The chip can also record parameters such as the production batch number, expiration date, and specifications of the ablation needle or temperature probe.

[0038] The first delivery line 210 and the second delivery line 220 are connected in parallel. The first junction of the first delivery line 210 and the second delivery line 220 is connected to the output line of the power unit 100. The second junction of the first delivery line 210 and the second delivery line 220 is connected to the ablation device 400 through an insulating line 410. The insulating line 410 is also equipped with a third temperature sensor 211 and a second pressure sensor 212 for measuring the temperature and pressure of the working fluid therein (e.g., ...). Figure 2 (As shown).

[0039] Furthermore, a cooling valve 230 is provided at the first junction of the first delivery line 210 and the second delivery line 220. The cooling valve 230 allows the output line of the power unit 100 to be connected to either the first delivery line 210 or the second delivery line 220. During cryogenic operation, by manipulating the cooling valve 230 to connect the output line of the power unit 100 to the first delivery line 210, the cryogenic working fluid can be delivered to the ablation device 400 for cryogenic operation. During high-temperature operation, by manipulating the cooling valve 230 to connect the output line of the power unit 100 to the second delivery line 220, the cryogenic working fluid can be delivered through the second delivery line 220 to raise its temperature to a level suitable for high-temperature operation. The cooling valve 230 can be a three-way valve, with its three outlets connected to the output pipeline of the power unit 100, the first delivery pipeline 210 and the second delivery pipeline 220 respectively. Therefore, the output pipeline of the power unit 100 can be connected to one of the first delivery pipeline 210 and the second delivery pipeline 220.

[0040] A first temperature sensor 250 can be installed on or near the cold valve 230 to detect the temperature of the low-temperature working fluid.

[0041] After the cryogenic working fluid enters the second delivery pipeline 220, its temperature is regulated by the working fluid temperature control unit 300. Specifically, as follows... Figure 2 and Figure 7 As shown, the working fluid temperature control unit 300 includes a pre-heat exchange device 310 and a working fluid stabilizing device 320 connected in series on the second delivery pipeline 220. The pre-heat exchange device 310 regulates the working fluid to raise its temperature to a first temperature, and the working fluid stabilizing device 320 regulates the working fluid at the first temperature to raise its temperature to a second temperature for high-temperature operation. The second temperature is higher than the first temperature. Through step-like temperature control, heat exchange efficiency can be improved, allowing the temperature of the low-temperature working fluid to rise rapidly to the required temperature.

[0042] This invention employs a two-stage stepped temperature control method to increase the temperature of the cryogenic working fluid. Specifically, the first stage of temperature control is achieved through a pre-heat exchange device 310, and the second stage is achieved through a working fluid stabilizing device 320. Understandably, a multi-stage stepped temperature control method can also be used; for example, multiple working fluid stabilizing devices 320 can be configured to achieve more precise temperature adjustment of the cryogenic working fluid.

[0043] Specifically, the pre-heat exchange device 310 includes a first heat exchanger 311 and a first fan 312 connected to the second delivery pipeline 220. The first heat exchanger 311 has an air heat exchange path. The working fluid in the second delivery pipeline 220 undergoes convective heat exchange with air in the air heat exchange path. The first fan 312 provides hot air to the air heat exchange path to accelerate thermal convection. The second delivery pipeline 220 delivers the low-temperature working fluid to the air heat exchange path in the first heat exchanger 311, where the low-temperature working fluid exchanges heat with the air, causing its temperature to rise.

[0044] The working fluid stabilization device 320 includes a heater 321, which may be a PTC heater. The heater 321 is connected to the first heat exchanger 311. After the first heat exchange, the working fluid undergoes a second heat exchange in the heater 321, and its temperature can reach the temperature required for high-temperature operation.

[0045] The heater 321 includes an energy storage body, a heating element for heating the energy storage body, and a temperature sensing element mounted on the energy storage body. A heat exchange path is provided within the energy storage body, through which the working fluid output from the first heat exchanger 311 exchanges heat. The heat exchange path has a condensation control function, which can control the generated water vapor and fumes internally and discharge them through rapid circulation of dry nitrogen, achieving stable output while ensuring environmental cleanliness.

[0046] The heater 321 also includes a temperature switch and an over-temperature interrupter connected to the heating element. Both the temperature switch and the over-temperature interrupter can stop the heating element from heating, thereby improving safety. Specifically, a temperature sensor is installed inside the heater 321, which is connected to the temperature switch. When the sensor detects that the temperature exceeds the set range, it sends a signal to the temperature switch, which can then block the heating operation of the heating element. This prevents situations where heating cannot be controlled due to failure of the heating element or control element.

[0047] Furthermore, if the temperature switch circuit malfunctions, the over-temperature interrupter will trip at an appropriate temperature to protect the heater 321 from dry burning.

[0048] In addition, the outer periphery of the heater 321 is covered with a heat insulation layer to ensure that the temperature difference between the surface temperature of the heater 321 and the ambient temperature does not exceed 10°C, thereby ensuring the operational safety of the heater 321.

[0049] A phase separation device 500 is connected in series on the first delivery pipeline 210. The phase separation device 500 is a two-stage gas-liquid separation device. Specifically, the phase separation device 500 includes a phase separator with a vent at its upper end, through which the vaporized low-temperature working fluid can be discharged.

[0050] The vents are connected to a normally open separation line 510 and a regulating separation line 520, respectively. A first phase separation valve 511 and a first manual valve 512 are connected in series on the normally open separation line 510. Gas-liquid separation is achieved through these valves. When all nitrogen gas passing through the phase separator is exhausted and liquid nitrogen is discharged, the first phase separation valve 511 can be closed to reduce liquid nitrogen loss at the phase separator. The first manual valve 512 can adjust the flow resistance of the normally open separation line 510 to achieve a balance between the consumption of the cryogenic working fluid and gas-liquid separation. The normally open separation line 510 maintains the cooling effect of the ablation device 400, thereby ensuring the stable output of the power unit 100.

[0051] A second manual valve 521 and a second phase separation valve 522 are connected in series on the control and separation pipeline 520 (e.g. Figure 2 and Figure 14 As shown, the second hand valve 521 and the second phase separation valve 522 can be opened or closed as needed to regulate and intervene in the gas-liquid two-phase separation.

[0052] The liquid output side of the phase separation device 500 is connected to the insulated pipeline 410, so the liquid cryogenic working fluid after gas-liquid separation can be transported to the ablation device 400 through the insulated pipeline 410. Figure 8 As shown, the insulated pipeline is a multi-layer stainless steel transmission pipeline with a vacuum insulation layer inside. While outputting low-temperature or high-temperature working fluids, it ensures the temperature of the transmission path and guarantees the safety of medical staff and patients.

[0053] Multiple temperature sensors can be installed on the insulated pipeline 410 to monitor the temperature of the working fluid flowing to the ablation device 400.

[0054] The power unit 100 includes a first pressure vessel 110 storing a working fluid, such as Figure 5 and Figure 6 As shown, the first pressure vessel 110 is a stainless steel first pressure vessel, and a vacuum layer 101 is provided on its exterior.

[0055] The first pressure vessel 110 is equipped with a first safety valve 111, a regulating valve 112, and a first vent valve 113. The first safety valve 111 is connected to the control and discharge unit 600 through a silencer 114. Both the regulating valve 112 and the first vent valve 113 are connected to the control and discharge unit 600. Opening the regulating valve 112 and the first vent valve 113 prevents the pressure inside the first pressure vessel 110 from exceeding a predetermined value. The regulating valve 112 can be a conventional pressure control valve. When it fails to perform its pressure regulation task, the first vent valve 113 will activate to release pressure. The first vent valve 113 is a normally open valve, meaning it will automatically open to release pressure when the equipment is powered off, placing the equipment in a safe, unpressurized state.

[0056] The aforementioned control valve 112 and first vent valve 113 are electrically controlled valves, while the first safety valve 111 is a mechanical valve. There are two first safety valves 111, one of which is a redundant first safety valve to further improve safety.

[0057] If all electronic components and the first mechanical safety valve fail, or if there is a special need for pressure relief, pressure can also be released through the manual valve on the first pressure vessel 110 to ensure the safety of the equipment.

[0058] When the pressure inside the first pressure vessel 110 is too low, the pressure is increased by self-pressurization. Specifically, the first pressure vessel 110 is equipped with a pressurization pipeline, one end of which is connected to the bottom of the first pressure vessel 110, and the other end is connected to the side of the first pressure vessel 110. A pressurization valve 118 is also installed on the pressurization pipeline. When the pressure inside the first pressure vessel 110 is too low, the pressurization valve 118 opens, and the cryogenic working fluid in the first pressure vessel 110 enters the pressurization pipeline. It vaporizes through heat exchange with the outside environment through the pipe wall of the pressurization pipeline, causing a dramatic expansion in volume, thereby achieving self-pressurization of the first pressure vessel 110.

[0059] Therefore, the first pressure vessel 110 of the present invention can provide power for the output of the working fluid by making its internal working fluid storage environment component a pressure environment.

[0060] In addition, other pressurization methods can be used. For example, air can be forced into the first pressure vessel 110 by an air compressor, high-pressure gas with a boiling point not higher than that of the cryogenic working fluid can be introduced into the first pressure vessel 110 for pressurization, or the cryogenic working fluid can be heated to vaporize it. Another more direct way to provide power is to use a cryogenic pump for pumping, and the mass flow rate of the delivered cold working fluid can be adjusted by controlling the pump speed or power.

[0061] The working pressure of the first pressure vessel 110 can be a working pressure below the critical point of the working fluid. If the temperature is also low enough, the working fluid is in a liquid state. If the temperature is high enough, the working fluid is in a gaseous state. Alternatively, the working pressure can be a working pressure above the critical point of the working fluid, in which case the working fluid is in a supercritical state.

[0062] Taking nitrogen as an example: critical temperature Tc = 126.2 K (-147℃), critical pressure Pc = 3.4 MPa, and critical density 313.3 kg / m³. Near its critical point, nitrogen exhibits an exceptionally high coefficient of thermal expansion, specific heat capacity, and relatively low viscosity; a high heat transfer coefficient can be achieved with a small temperature difference. During supercritical nitrogen transport, the cooling loss along the path is minimal because the temperature is higher than that of liquid nitrogen. Due to the high operating pressure, the overall density is high, resulting in a large mass flow rate.

[0063] In addition, the first pressure vessel 110 is also provided with a first pressure gauge 115 for indicating the pressure of the first pressure vessel 110 and a first pressure sensor 119 for detecting the internal pressure of the first pressure vessel 110. The first pressure sensor 119 can be connected to the control system to transmit the corresponding pressure signal to the control system, thereby facilitating the control system to control the opening or closing of the corresponding valve.

[0064] The first pressure vessel 110 is provided with an output channel 121, which is connected to the output pipeline of the power unit 100 to transport cryogenic media. A filter 117 is provided on the output channel 121. This filter 117 is a cryogenic filter, which can prevent impurities from entering the distribution system and improve the reliability of the equipment.

[0065] The first pressure vessel 110 is provided with a filling port 116, through which cryogenic medium can be poured into the first pressure vessel 110. The first pressure vessel 110 is also provided with a level gauge 120 and a third hand valve 122. When the level gauge 120 detects that the liquid level in the first pressure vessel 110 has dropped below a predetermined position, it sends a signal to the control system so that cryogenic medium can be added and replenished in a timely manner.

[0066] The emission control unit 600 includes a second heat exchanger 610, a third heat exchanger 620, and a porous ventilation device 630. The second heat exchanger 610 is connected to the normally open separation pipe 510 and the regulating separation pipe 520 on the gas output side of the phase separation device 500. The normally open separation pipe 510 and the regulating separation pipe 520 can be connected to the second heat exchanger 610 in parallel, so that the gas after gas-liquid separation enters the second heat exchanger 610 for heat exchange, and its temperature approaches room temperature before being discharged.

[0067] A second temperature sensor 530 is installed on the pipeline connecting the normally open separation pipeline 510 and the regulating separation pipeline 520 to the second heat exchanger 610. The second temperature sensor 530 is located downstream of the first phase separation valve 511 to detect the temperature of the discharged gas. The flow rate of the discharged gas can be adjusted according to the temperature of the discharged gas and the temperature at which the gas can be discharged.

[0068] In addition, the working fluid in the ablation device 400 after heat exchange is output from it and returned to the second heat exchanger 610 for heat exchange, so that the working fluid after heat exchange can also be discharged into the environment.

[0069] The third heat exchanger 620 is connected to the silencer 114, the control valve 112, the first vent valve 113, and the output side of the ablation device 400. Therefore, the cryogenic working fluid discharged from the first pressure vessel 110 through the first safety valve 111, the control valve 112, and the first vent valve 113 can be heat exchanged through the third heat exchanger 620.

[0070] Temperature sensors are installed on both the second heat exchanger 610 and the third heat exchanger 620 to monitor their temperature.

[0071] The porous ventilation device 630 is connected to both the second heat exchanger 610 and the third heat exchanger 620. The porous ventilation device 630 allows the medium, after heat exchange and reaching near-normal temperature, to be discharged into the environment. The porous ventilation device 630 is also connected to a second fan 640. The second fan 640 can be installed within or outside the porous ventilation device 630.

[0072] Both the second heat exchanger 610 and the third heat exchanger 620 are connected to a heat exchange fan to improve heat exchange efficiency.

[0073] The aforementioned power unit 100, working fluid distribution unit 200, working fluid temperature control unit 300, and electrical control system are all integrated within the main frame 700. The main frame 700 is externally fitted with a housing 710, such as... Figure 3 and Figure 4 As shown, the bottom of the main frame 700 is provided with casters 720, which, together with the push handle on the outer casing 710, make it easy to move the main frame 700.

[0074] The temperature control method of the ablation system of the present invention further includes an electrical control system and an interactive system. The electrical control system includes a power supply system and a computer control system, wherein the power supply system includes an air switch, a power filter, and a switching power supply. The computer control system includes an industrial computer and a main control board, which are communicatively connected and both are electrically connected to the switching power supply. The industrial computer is communicatively connected to the interactive system.

[0075] The main control board is communicatively connected to the various pressure sensors, temperature sensors, and level gauge 120 mentioned above to collect signals such as pressure, temperature, and level. In addition, the main control board is also communicatively connected to the various valves, heater 321, first fan 312, and second fan 640 mentioned above to control their operation. The main control board can also communicate with the audio output device of the interactive system to output voice prompts.

[0076] The main control board receives inputs from the foot switch and start / emergency stop switch on the main frame 700 to control start and stop.

[0077] Electrical control systems can be implemented using PCBAs or PLCs, etc.

[0078] The interactive system includes a display (710) and a function keypad (810) on the casing, and a wireless tablet for surgical operations, each of which can be operated independently. It also features indicator lights, battery level display, surgical output status display, and RFID identification functions to help users better utilize the system and improve its usability.

[0079] The interactive system can integrate a 5G communication module. After connecting to the Internet, medical device manufacturers can monitor the system's usage status through the enterprise server, collect data on devices already on the market, and provide conditions for device maintenance and optimization.

[0080] On the other hand, the present invention provides a temperature control method for an ablation system, wherein the ablation system may be the ablation system described in detail above. Therefore, the detailed structure of the ablation system will not be repeated below. It is understood that the various embodiments of the temperature control method for the ablation system of the present invention should be able to be combined with the ablation system described above without any obstacles.

[0081] This invention provides a temperature control method for an ablation system that can be used in the experimental or testing phase of an ablation system. Specifically, the temperature control method of this invention can control... Figure 10 The power unit 100 of the ablation system shown Figure 12 The back pressure control unit 900 shown and Figure 14 One or more of the working fluid distribution units 200 shown are used to control the temperature of the ablation device 400.

[0082] Example 1 By controlling the opening and closing state of the first valve mechanism of the power unit 100 of the ablation system, the pressure of the first state working medium input by the power unit 100 to the input side of the ablation device 400 is controlled, thereby adjusting the pressure of the first state working medium and thus adjusting the temperature of the ablation device 400.

[0083] The working medium in the first state can be liquid nitrogen (cryo-liquid nitrogen).

[0084] Please refer to Figure 1 , Figure 10 and Figure 11The power unit 100 includes a first pressure vessel 110, and the first valve mechanism includes a regulating valve 112, a first venting valve 113, and a pressure boosting valve 118 on the first pressure vessel 110. In conjunction with the above, the first valve mechanism may also include a first safety valve 111. The first pressure vessel 110 may also be equipped with components such as a silencer 114, a first pressure gauge 115, an inlet 116, a filter 117, and a level gauge 120, the specific configuration of which can be found above.

[0085] Changing the temperature of the ablation device 400 by adjusting the rate at which the first working fluid is supplied from the first pressure vessel 110 to the input side of the ablation device 400 includes the following operational steps.

[0086] S100: Power unit 100 (first pressure vessel 110) operates according to the set temperature. T 1 (e.g., -120℃) outputs the first-state working fluid to the ablation device 400, and the duration is... t 4 (for example, it could be 60 seconds).

[0087] S101: Determine if the temperature of the ablation device 400 is lower than the set temperature. T 1. If yes, proceed to step S102; otherwise, the duration is... t Return to step S101 after 1 (e.g., 5 seconds).

[0088] S102: Determine if the temperature of the ablation device 400 is lower than the second temperature. T 2 (e.g., -130℃). If yes, proceed to step S103; otherwise, proceed to step S104.

[0089] S103: Determine whether the pressure of the first pressure vessel 110 is higher than the first pressure. P 1 (e.g., 0.3 MPa), if so, record the current pressure inside the first pressure vessel 110. P 11 1. Open the first vent valve 113 and execute step S105; otherwise, record the current pressure inside the first pressure vessel 110. P 12 Open the control valve 112 and execute step S106.

[0090] S104: Determine whether the temperature of the ablation device 400 is higher than the third set temperature. T 3 (e.g., -110℃), if so, record the current pressure inside the first pressure vessel 110. P 14 1. Open control valve 112 and execute step S107; otherwise, the duration is... t 2 (for example, 1 second) then return to step S102.

[0091] S105: Determine whether the current pressure inside the first pressure vessel 110 is lower than the second pressure vessel. P 2. If yes, then close the first vent valve 113 and execute step S108; if no, then the duration... t 3 (for example, 0.5s) then return to step S105.

[0092] S106: Determine whether the pressure inside the first pressure vessel 110 is lower than the third pressure vessel. P 3. If yes, then close the control valve 112 and execute step S108; if no, then the duration... t After step 3, return to step S106.

[0093] S107: Determine whether the pressure inside the first pressure vessel 110 is higher than that inside the fourth pressure vessel. P 4. If yes, then close the pressure boosting valve 118 and execute step S108; if no, then the duration... t After step 3, return to step S107.

[0094] S108: Duration t After step 1, return to step S102.

[0095] Among them, the second temperature T 2 can be compared to the set temperature T 1. Lower by 5-15℃, third temperature T 3 can be compared to the set temperature T 1. 5-15℃ higher, that is T 3> T 1> T 2.

[0096] Duration t 4 represents the duration of the initial stage of the system's low-temperature output, which requires a certain amount of time to pre-cool the system's piping. t 4 is relatively long, exceeding the duration. t 1. t 2 and t 3. And the duration t 3 represents the duration after a cycle of adjustment ends; therefore, this duration can be related to the duration of the cycle. t 1. Roughly the same, and longer than the duration t 3. Due to duration t 3 represents the delay time for adjusting the corresponding valve and making a judgment; therefore, a faster response results in a longer duration. t 3 is shorter, that is t 4> t 1> t 2> t 3.

[0097] Second pressure P 2 and the current pressure inside the first pressure vessel 110 P 11 The following relation (1) must be satisfied: P 2= C 1· P 11 (1) Third pressure P 3 and the current pressure within the power unit 100 P 12 The following relation (2) must be satisfied: P 3= C 2· P 12 (2) Fourth pressure P 4. Current pressure within the power unit 100 P 14 The following relation (3) must be satisfied: P 4= C 3· P 14 (3) in, C 1. C 2 and C 3 represents the proportionality coefficient. For example, C 1 = 0.9 C 2 = 0.95, C 3 = 1.1.

[0098] That is to say, in step S103, if the pressure of the first pressure vessel 110 is higher than the first pressure... P If the pressure is 1, it indicates that the pressure in the first pressure vessel 110 is too high, therefore the first vent valve 113 needs to be opened to release the pressure; if the pressure is lower than 0.9 after venting... P 11 If the pressure is high enough, it indicates that the excessive pressure in the first pressure vessel 110 has been released, and therefore the first vent valve 113 can be closed.

[0099] Conversely, in step S103, if the pressure of the first pressure vessel 110 is not higher than the first pressure... P If the pressure is below 0.95 after adjustment, the control valve 112 needs to be opened for pressure regulation. P 11 Then the control valve 112 can be closed.

[0100] Example 2 By controlling the opening of the second valve mechanism of the back pressure control unit 900 of the ablation system, the temperature, pressure, or flow rate of the working fluid in the second state is adjusted, thereby changing the pressure difference between the input and return sides of the ablation device 400, and thus achieving the purpose of adjusting the temperature of the ablation device 400. The working fluid in the second state can be room temperature nitrogen.

[0101] Therefore, in this embodiment 2, the temperature of the ablation device 400 is adjusted by back pressure regulation, which can avoid the control of cryogenic liquid nitrogen in the power unit 100 and does not affect the output of cryogenic liquid nitrogen in the power unit 100. Therefore, it has the advantages of fast response, precise regulation and simple logic.

[0102] This embodiment 2 can be used as an alternative to the above embodiment 1, or this embodiment 2 can be used in combination with the above embodiment 1.

[0103] Please refer to Figure 1 , Figure 12 and Figure 13 The back pressure control unit 900 of the ablation system includes a second pressure vessel 901, a second valve mechanism disposed on the second pressure vessel 901, a second pressure gauge 905, and a third pressure sensor 906. The second pressure gauge 905 and the third pressure sensor 906 are used to indicate and measure the pressure inside the second pressure vessel 901, respectively.

[0104] The second valve mechanism may be one or more of the proportional relief valve 902, the second vent valve 903, and the second safety valve 904 installed on the second pressure vessel 901. By opening the proportional relief valve 902, the second-state working fluid in the second pressure vessel 901 can be discharged into the environment.

[0105] The second pressure vessel 901 is provided with a reflux inlet, which is connected to the second heat exchanger 610 of the control discharge unit 600 in the ablation system described above. Thus, the working fluid in the ablation device 400 after heat exchange can be input from its reflux side to the second heat exchanger 610 for heat exchange, and then input into the second pressure vessel 901 through the reflux inlet.

[0106] Specifically, adjusting the pressure of the second-state working fluid in the back pressure control unit 900 connected to the reflux side of the ablation device 400 to change the temperature of the ablation device 400 includes the following operating steps.

[0107] S200: Power unit 100 (first pressure vessel 110) operates according to the set temperature. T 1 (e.g., -120℃) outputs the first state working fluid to the ablation device 400 for a duration of t4 (e.g., 60s).

[0108] S201: Determine if the temperature of the ablation device 400 is lower than the set temperature. T 1 (e.g., -120℃), if yes, proceed to step S202; otherwise, the duration... t Return to step S201 after 1 (e.g., 5 seconds).

[0109] S202: Determine if the temperature of the ablation device 400 is lower than the second temperature. T 2 (For example, it could be -130℃) If yes, then proceed to step S203; if no, then proceed to step S204.

[0110] S203: By adjusting the opening of the proportional relief valve 902, the pressure inside the second pressure vessel 901 is made to reach... P 5. Then proceed to step S206.

[0111] S204: Determine if the temperature of the ablation device 400 is higher than the third temperature. T 3 (e.g., -110℃), if yes, proceed to step S205; otherwise, the duration... t 2 (for example, 1 second) then return to step S201.

[0112] S205: By adjusting the opening degree of the proportional relief valve 902, the pressure inside the second pressure vessel 901 is made to reach... P 6. Then proceed to step S206.

[0113] S206: Duration t After step 1, return to step S202.

[0114] Among them, the fifth pressure P 5. Current pressure within the second pressure vessel 901 P 21 The following relation (4) must be satisfied: P 5= C 3· P 21 (4) Sixth pressure P 6 and the current pressure inside the second pressure vessel 901 P 22 The following relation (5) must be satisfied: P 6= C 2· P 22 (5) in, C 2 and C 3 represents the proportionality coefficient. For example, C 2 = 0.95, C3 = 1.1.

[0115] The initial pressure inside the second pressure vessel 901 can be 0.1 MPa.

[0116] The temperature and pressure parameters mentioned above can be the same as those in Example 1.

[0117] The second vent valve 903 can be set to a normally open state.

[0118] Example 3 The temperature of the ablation device 400 is changed by controlling the flow rate, temperature, and pressure of the third-state working medium in the working medium distribution unit 200 of the ablation system. The third-state working medium can be high-temperature nitrogen.

[0119] Therefore, this embodiment regulates the high-temperature nitrogen gas after heat exchange in the preheating device 310, thereby avoiding the control of cryogenic liquid nitrogen in the power unit 100 and not affecting the output of cryogenic liquid nitrogen in the power unit 100. Thus, it has advantages such as rapid response, precise regulation, and simple logic.

[0120] Please refer to Figure 1 , Figure 14 and Figure 15 The working fluid distribution unit 200 of the ablation system includes a hot valve 240, a cold valve 230, and a flow regulating valve 260.

[0121] The working fluid distribution unit 200 also includes a first delivery pipeline 210 and a second delivery pipeline 220. The first delivery pipeline 210 is connected to the power unit 100 and is used to deliver the working fluid for low-temperature operation. The second delivery pipeline 220 is connected to the first delivery pipeline 210, and a working fluid temperature control unit 300 is connected to the second delivery pipeline 220 to regulate the temperature of the working fluid in the second delivery pipeline 220 so that it can perform high-temperature operation.

[0122] A hot valve 240 is installed on the second delivery pipeline 220, and a cold valve 230 is installed on the first delivery pipeline 210. The second delivery pipeline 220 is connected to the first heat exchanger 311 of the preceding heat exchange device 310, and the first heat exchanger 311 is also connected to the first delivery pipeline 210 via a third delivery pipeline 270. The working fluid stabilizing device 320 is installed on the third delivery pipeline 270.

[0123] The working fluid stabilization device 320 includes a heater 321 and a fourth temperature sensor 322 connected to the heater 321. The heater 321 can be a PTC heater. The heater 321 is connected to the first heat exchanger 311. The working fluid, after heat exchange in the first heat exchanger 311, undergoes a second heat exchange in the heater 321, and its temperature can reach the temperature required for high-temperature operation. A one-way valve 271 and a temperature sensor can also be installed on the third delivery pipeline 270. The one-way valve 271 can prevent backflow of the working fluid.

[0124] Changing the temperature of the ablation device 400 by controlling the flow rate, temperature, and pressure of the third-state working fluid in the working fluid distribution unit 200 of the ablation system includes the following sub-steps.

[0125] S300: Open the cooling valve 230 to allow the power unit 100 (first pressure vessel 110) to operate at the set temperature. T 1 (e.g., -120℃) outputs the first-state working fluid to the ablation device 400, and the duration is... t 4 (for example, it could be 60 seconds).

[0126] S301: Determine if the temperature of the ablation device 400 is lower than the set temperature. T 1 (e.g., -120℃), if yes, proceed to step S302; otherwise, the duration... t 1 (e.g., 60s) then return to step S301.

[0127] S302: Open the thermal valve 240 and adjust the opening of the flow regulating valve 260 to the initial opening. K 0, duration t Step S303 is executed after step 5. The initial opening degree is... K 0 can be 10%.

[0128] S303: Determine if the temperature of the ablation device 400 is lower than the set temperature. T 2 (e.g., -130℃). If yes, proceed to step S304; otherwise, proceed to step S305.

[0129] S304: Increase the opening degree of flow regulating valve 260 to K 1. And execute step S307; S305: Determine whether the temperature of the ablation device 400 is higher than the set temperature. T 3 (e.g., -110℃), if yes, proceed to step S306; otherwise, the duration... t 2 (for example, 1 second) then return to step S303.

[0130] S306: Reduce the opening of the flow regulating valve 260 to K2. And execute step S307.

[0131] S307: Duration t After 5 seconds (e.g., 3 seconds), return to step S303.

[0132] in, K 1- K 0 = 1%, K 0- K 2 = 1%; that is, in step S304, the opening degree of the flow regulating valve 260 increased by 1%. In step S306, the opening degree of the flow regulating valve 260 decreased by 1%.

[0133] The temperature and pressure parameters mentioned above can be the same as those in Example 1.

[0134] In this embodiment, embodiment 3 can be used as an alternative to embodiment 1 or embodiment 2, or embodiment 3 can be used in combination with embodiment 1 and / or embodiment 2.

[0135] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A temperature control method for an ablation system, characterized in that, Includes the following steps: S2: Adjust the pressure of the second-state working fluid in the back pressure control unit (900) connected to the reflux side of the ablation device (400) to change the temperature of the ablation device (400); The back pressure control unit (900) includes a second pressure vessel (901) connected to the reflux side of the ablation device (400) and a proportional relief valve (902) connected to the second pressure vessel (901). The second pressure vessel (901) is provided with a reflux inlet, which is connected to the second heat exchanger (610) of the control discharge unit (600) in the ablation system. This allows the working fluid in the ablation device (400) after heat exchange to be input from its reflux side to the second heat exchanger (610) for heat exchange, and then input to the second pressure vessel (901) via the reflux inlet. The back pressure control unit (900) also includes a second pressure gauge (905) and a third pressure sensor (906) provided on the second pressure vessel (901). The second pressure gauge (905) and the third pressure sensor (906) are used to indicate and measure the pressure inside the second pressure vessel (901), respectively. In step S2, the pressure difference between the reflux side and the input side of the ablation device (400) is adjusted by the proportional overflow valve (902), thereby changing the temperature, pressure or flow rate of the second state working fluid in the back pressure control unit (900) to change the temperature of the ablation device (400). Step S2 includes the following sub-steps: S201: Determine whether the temperature of the ablation device (400) is lower than the set temperature. T 1. If yes, proceed to step S202; otherwise, the duration is... t After step 1, return to step S201; S202: Determine whether the temperature of the ablation device (400) is lower than the second temperature. T 2. If yes, proceed to step S203; if no, proceed to step S204. S203: By adjusting the opening degree of the proportional relief valve (902), the pressure inside the second pressure vessel (901) is made to reach the fifth pressure. P 5. And execute step S206, fifth pressure. P 5 and the current pressure inside the second pressure vessel (901) P 21 satisfy P 5= C 3· P 21 , C 3 = 1.1; S204: Determine whether the temperature of the ablation device (400) is higher than the third temperature. T 3. If yes, proceed to step S205; otherwise, the duration is... t After step 2, return to step S201. T 3> T 1> T 2; S205: By adjusting the opening of the proportional relief valve (902), the pressure inside the second pressure vessel (901) is made to reach the sixth pressure. P 6. And execute step S206, sixth pressure P 6 and the current pressure inside the second pressure vessel (901) P 22 satisfy P 6= C 2· P 22 , C 2 = 0.95; S206: Duration t After step 1, return to step S202.

2. The temperature control method for the ablation system according to claim 1, characterized in that, Step S2 also includes step S200, which precedes step S201. S200: Power unit (100) according to the set temperature T 1. Outputs a first-state working fluid to the ablation device (400) for a duration of... t 4.

3. The temperature control method for the ablation system according to claim 2, characterized in that, Second temperature T 2 compared to the set temperature T 1. Lower by 5-15℃.

4. The temperature control method for the ablation system according to claim 2, characterized in that, Duration t 1, t 2 and t 4. Satisfies the following relationship: t 4> t 1> t 2.

5. The temperature control method for the ablation system according to claim 1, characterized in that, The working medium in the second state is nitrogen gas at room temperature.

6. An ablation system wherein the temperature of the ablation device is controlled by the temperature control method of any one of claims 1-5.

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