Phase separation valve control device, control method, and cryogenic cryoablation system

Abstract

The application provides a phase separation valve control device, a control method and a low-temperature cryoablation system, which comprises a switch control module and a temperature sensing module, the switch control module is configured to determine whether to open the phase separation valve according to the operation specification of the low-temperature cryoablation system where the phase separation valve is located, the temperature sensing module is configured to obtain the target temperature at the exhaust port of the phase separation valve after the switch control module opens the phase separation valve, and the switch control module is further configured to determine whether to close the phase separation valve according to whether the target temperature is higher than a first temperature threshold. Based on the technical scheme of the application, based on the control of the phase separation valve, the waste of the refrigeration working medium is reduced, the consumption rate of the refrigeration working medium is obviously reduced, the duration of the system that can be used for low-temperature freezing is prolonged, and there is no adverse effect on the temperature and ablation effect of the ablation system.

Description

[0001] The present application is a divisional application of Chinese Patent CN202310219899.5, Phase Separation Valve Control Device, Control Method and Cryogenic Cryoablation System. TECHNICAL FIELD

[0002] The present application relates to the technical field of cryogenic cryoablation, in particular to a phase separation valve control device, a control method and a cryogenic cryoablation system. BACKGROUND

[0003] The cryogenic cryosurgery system is an advanced minimally invasive medical system integrating deep cryogenic cryoablation and rewarming functions. Through the pre-freezing cooling effect, the system kills targeted tumor cells at low temperature. In clinical use, the liquid nitrogen stored in the cold tank is sent to the ablation needle connected to the device through the internal pipeline of the device for cryogenic cryoablation treatment. Since the internal pipeline of the device is not always in a vacuum thermal insulation state, part of the liquid nitrogen in the pipeline will vaporize into nitrogen gas during the delivery of liquid nitrogen. The temperature of nitrogen gas is higher than that of liquid nitrogen, which will affect the treatment effect. Therefore, a phase separation valve is usually provided to separate the gas and liquid and discharge the nitrogen gas. As the operation continues, the temperature of the internal pipeline will decrease, and the amount of nitrogen gas generated will also decrease. Therefore, most of the liquid nitrogen is discharged through the phase separation valve at this time, which causes waste of low-temperature working medium, increases the burden of the heat regenerator, and affects the operation time.

[0004] Therefore, a targeted control method is needed to control the opening and closing of the phase separation valve according to the progress of the operation, to fully meet the needs of the operation while avoiding waste of low-temperature working medium. SUMMARY

[0005] In order to solve the problems of waste of low-temperature working medium and reduction of treatment efficiency caused by the fact that the prior art does not control the phase separation valve specially, the present application proposes a phase separation valve control device, a control method and a cryogenic cryoablation system.

[0006] In a first aspect, the present application provides a phase separation valve control device, which comprises a switch control module and a temperature sensing module. The switch control module is configured to determine whether to open the phase separation valve according to the running specifications of the cryogenic cryoablation system in which the phase separation valve is located. The temperature sensing module is configured to obtain the target temperature at the exhaust port of the phase separation valve after the switch control module opens the phase separation valve. The switch control module is further configured to determine whether to close the phase separation valve according to whether the target temperature is higher than a first temperature threshold.

[0007] In one embodiment, the temperature sensing module is further configured to: before obtaining the target temperature at the exhaust port of the phase separation valve, first obtain the backflow temperature of the low-temperature output channel of the cryogenic cryoablation system, and determine the size relationship between the backflow temperature and the first temperature threshold.

[0008] The switch control module is further configured to: when the backflow temperature is higher than the first temperature threshold, maintain the current open state of the phase separation valve; and when the backflow temperature is not higher than the first temperature threshold, further determine whether to close the phase separation valve according to whether the target temperature is higher than the first temperature threshold.

[0009] In one embodiment, the switch control module is configured to determine whether to close the phase separation valve according to whether the target temperature is higher than the first temperature threshold, including:

[0010] If the target temperature is higher than the first temperature threshold, the current open state of the phase separation valve is maintained; and if the target temperature is not higher than the first temperature threshold and is maintained for a preset time length, the phase separation valve is closed.

[0011] In one embodiment, the switch control module is configured to determine whether to open the phase separation valve according to the running specification of the cryogenic cryoablation system in which the phase separation valve is located, including:

[0012] obtaining the diameter of the ablation needle of the cryogenic cryoablation system and the number of currently enabled cryogenic output channels;

[0013] when the diameter of the ablation needle is not greater than a diameter threshold, directly opening the phase separation valve;

[0014] when the diameter of the ablation needle is greater than the diameter threshold, further determining whether to open the phase separation valve according to whether the number of cryogenic output channels is greater than a number threshold, and opening the phase separation valve when the number of cryogenic output channels is not greater than the number threshold.

[0015] In one embodiment, the temperature sensing module is further configured to: after the phase separation valve is closed, again obtaining the current target temperature at the exhaust port of the phase separation valve;

[0016] The switch control module is further configured to: when the target temperature reaches above a second temperature threshold, open the phase separation valve, the second temperature threshold being greater than the first temperature threshold.

[0017] In one embodiment, the switch control module is further configured to: set a delay time N; and when the target temperature reaches above the second temperature threshold, open the phase separation valve after delaying for N seconds.

[0018] In one embodiment, the switch control module is further configured to: according to the target temperature and the second temperature threshold, update the delay time N when next determining whether to close the phase separation valve after opening the phase separation valve.

[0019] In one embodiment, the delay time N is updated, comprising:

[0020] If the obtained backflow temperature of the cryogenic output channel of the cryogenic ablation system is higher than the first temperature threshold, the update process of delay time N=N-1 is executed once before the backflow temperature reaches no higher than the first temperature threshold while keeping the current open state of the phase separation valve.

[0021] If the obtained backflow temperature of the cryogenic output channel of the cryogenic ablation system is no higher than the first temperature threshold, the delay time N=N+1 is updated before the phase separation valve is controlled to be closed.

[0022] In one embodiment, the delay time N is in the range of [1, 10].

[0023] In the second aspect, the present application provides a cryogenic ablation system, comprising a phase separation valve arranged on a cryogenic medium pipeline and the phase separation valve control device described above, thereby having all the technical effects thereof.

[0024] In the third aspect, the present application provides a phase separation valve control method, which controls the phase separation valve by using the phase separation valve control device described above.

[0025] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present application can be achieved.

[0026] The phase separation valve control device, control method and cryogenic ablation system provided by the present application have at least the following beneficial effects compared with the prior art:

[0027] The phase separation valve control device, control method and cryogenic ablation system of the embodiments of the present application, based on the effective control of the phase separation valve, reduce the waste of refrigeration working medium, significantly reduce the consumption rate of the refrigeration working medium, prolong the duration of the system for cryogenic freezing, and have no adverse effects on the temperature and ablation effect of the ablation system. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be described in more detail below based on embodiments and with reference to the accompanying drawings. Among them:

[0029] Figure 1 The flowchart of the phase separation valve control device of embodiment 1 of the present application for the phase separation valve in the first control cycle is shown;

[0030] Figure 2 The flowchart of the phase separation valve control device of embodiment 1 of the present application for the phase separation valve in the subsequent control cycle is shown;

[0031] Figure 3 shows a flow chart of the phase separation valve control device of embodiment 2 of the present application for the phase separation valve in the subsequent control cycle;

[0032] Figure 4 shows a working medium consumption curve chart under the control of the phase separation valve control device of the present application;

[0033] Figure 5 shows a working medium consumption curve chart under the control of the phase separation valve control device of the present application;

[0034] Figure 6 shows a temperature curve chart under the control of the phase separation valve control device of the present application;

[0035] Figure 7 shows a temperature curve chart under the control of the phase separation valve control device of the present application;

[0036] Figure 8 shows a schematic diagram of the principle structure of a low-temperature refrigeration ablation system corresponding to the phase separation valve control device of the present application. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the accompanying drawings.

[0038] Embodiment 1

[0039] Reference drawings Figure 1 With Figure 2 The embodiment of the present application provides a phase separation valve control device, which comprises a switch control module and a temperature sensing module, the switch control module is configured to determine whether to open the phase separation valve according to the operation specification of a low-temperature refrigeration ablation system where the phase separation valve is located, the temperature sensing module is configured to obtain a target temperature at the exhaust port of the phase separation valve after the switch control module opens the phase separation valve, and the switch control module is further configured to determine whether to close the phase separation valve according to whether the target temperature is higher than a first temperature threshold.

[0040] The temperature sensing module is used to obtain temperature data at the response position of the phase separation valve and the low-temperature refrigeration ablation system, and the switch control module is used to control the opening and closing of the phase separation valve according to the temperature data, and the switch control module comprises a master control unit and an execution unit. The structure of the switch control module and the temperature sensing module and the mode of electrical connection thereof are relatively mature prior art, and the present application will not be described in detail. The control method of the phase separation valve control device of the present application is as follows:

[0041] Step S100: determining whether to open the phase separation valve according to the operation specification of a low-temperature refrigeration ablation system where the phase separation valve is located;

[0042] Step S110: The main control unit acquires the diameter of the ablation needle of the low-temperature cryoablation system and the number of currently enabled low-temperature output channels, and compares the acquired corresponding values with corresponding threshold values;

[0043] Step S120: When the diameter of the ablation needle is not greater than the diameter threshold value, the execution unit directly opens the phase separation valve;

[0044] Step S130: When the diameter of the ablation needle is greater than the diameter threshold value, the main control unit further determines whether to open the phase separation valve according to whether the number of low-temperature output channels is greater than the number threshold value, and controls the execution unit to open the phase separation valve when the number of low-temperature output channels is not greater than the number threshold value.

[0045] Specifically, at the first time when the low-temperature cryoablation system starts, the main control unit synchronously acquires the running specifications of the low-temperature cryoablation system, which include the diameter of the currently used ablation needle and the number of currently opened low-temperature output channels (determined based on the number of opened cold valves corresponding to the low-temperature output channels). First, a judgment is made according to the diameter of the ablation needle. If the diameter of the ablation needle is not greater than the diameter threshold value (the diameter threshold value is 1.7 mm based on the standard size of the ablation needle), it indicates that the internal channel of the ablation needle is very small. In order to avoid the possible influence of gas on the cryoablation effect, the main control unit directly judges that the phase separation valve needs to be opened. If the diameter of the ablation needle is greater than the diameter threshold value, the main control unit further judges whether the number of low-temperature output channels is greater than the number threshold value (usually 2). If the number of low-temperature output channels is large and greater than the number threshold value, it indicates that the gas in the pipeline will be dispersed into enough low-temperature output channels, and the amount of gas in a single channel is small, which will not affect the cryoablation effect. At this time, the phase separation valve can be not opened. Conversely, if the number of low-temperature output channels is small and not greater than the number threshold value, the amount of gas in a single channel is large, which will affect the cryoablation effect. At this time, the execution unit needs to open the phase separation valve.

[0046] Step S200: After the phase separation valve is opened, the main control unit judges whether to enter the closing control stage of the phase separation valve according to the temperature data acquired by the temperature sensing module;

[0047] Step S210: The temperature sensing module acquires the backflow temperature T 回流温度 of the low-temperature output channel of the low-temperature cryoablation system, and the main control unit judges the size relationship between the backflow temperature T 回流温度 and the first temperature threshold value;

[0048] Step S220: If the backflow temperature T 回流温度 is higher than the first temperature threshold value, the current opened state of the phase separation valve is maintained;

[0049] Step S230: If the backflow temperature T 回流温度If the temperature is not higher than the first temperature threshold, then the target temperature T at the exhaust port of the phase separation valve, obtained by the temperature sensing module, is used. 相分离阀 Whether the temperature exceeds the first temperature threshold is determined by the main control unit, which then decides whether to close the phase separation valve.

[0050] Specifically, in the initial stage of the cryogenic cryoablation system, after opening the phase separation valve according to the operating specifications, as the ablation progresses, it is necessary to determine whether to enter the phase separation valve closing control phase. The reflux temperature T of the cryogenic output channel of the cryogenic cryoablation system needs to be obtained. 回流温度 If the reflow temperature T of all low-temperature output channels 回流温度 If the temperature does not exceed the first temperature threshold (in this embodiment, the cryoablation medium is liquid nitrogen, and based on the boiling point of liquid nitrogen, the first temperature threshold is -190℃), it indicates that the ablation needle temperature has reached the ablation temperature, and the system begins to enter the control mode of the phase separation exhaust port solenoid valve (i.e., the phase separation valve). The temperature is determined based on the target temperature T at the exhaust port of the phase separation valve. 相分离阀 Determine whether to close the phase separation valve. If there is a reflux temperature T in the low-temperature output channel. 回流温度 If the temperature is higher than the first temperature threshold, it indicates that some ablation needles have not yet reached the ablation temperature, therefore the separation valve remains open. Furthermore, while keeping the separation valve open, the return temperature T is continuously monitored. 回流温度 And determine its relationship with the first temperature threshold, until the reflux temperature T. 回流温度 When the temperature changes to a level not exceeding the first temperature threshold, the system enters the phase separation valve control mode, i.e., based on the target temperature T at the phase separation valve exhaust port. 相分离阀 Determine whether to close the phase separation valve.

[0051] Step S300: With the phase separation valve remaining open, the temperature sensing module acquires the target temperature T at the exhaust port of the phase separation valve. 相分离阀 ;

[0052] Step S400: The main control unit determines the target temperature T based on the target temperature T. 相分离阀 Determine whether to close the phase separation valve based on whether the temperature exceeds the first temperature threshold.

[0053] Step S410: If the target temperature T 相分离阀 If the temperature exceeds the first temperature threshold, the phase separation valve remains open via the execution unit; Step S420: If the target temperature T 相分离阀 If the temperature is not higher than the first temperature threshold, the phase separation valve will be closed by the execution unit;

[0054] Specifically, read the target temperature T at the exhaust port of the phase separation valve. 相分离阀 If T 相分离阀If the temperature is not higher than the first temperature threshold (in this embodiment, the first temperature threshold is -190°C), it indicates that at least most of the current discharge from the phase separation valve is refrigerant (liquid nitrogen in this embodiment), therefore the phase separation valve should be closed. If T 相分离阀 If the temperature exceeds the first temperature threshold, it indicates that at least most of the gas being discharged from the phase separation valve is gas (nitrogen in this embodiment). Therefore, the phase separation valve needs to be kept open to continue venting.

[0055] Furthermore, after maintaining the phase separation valve open for venting, the process can be as shown in the attached diagram. Figure 1 The control flow shown is repeated in the same manner as described above, with T being executed sequentially. 回流温度 With T 相分离阀 The acquisition and related judgment process. Of course, depending on the actual situation, and based on T... 相分离阀 If the phase separation valve remains open above the first temperature threshold, it is also possible to simply repeat the T process. 相分离阀 The acquisition and related judgment process serve as the basis for the next control of the phase separation valve, thereby enabling T... 相分离阀 After the value meets the closing condition, close the phase separation valve and continue with subsequent steps, or at T 相分离阀 If the value is not satisfied, the phase separation valve will remain open until the end of one freeze-drying process.

[0056] Step S500: The main control unit determines whether to reopen the phase separation valve based on the temperature data obtained by the temperature sensing module;

[0057] Step S510: The temperature sensing module acquires the current target temperature T at the exhaust port of the phase separation valve again. 相分离阀 ;

[0058] Step S520: At the target temperature T 相分离阀 When the second temperature threshold is reached or above, the execution unit opens the phase separation valve. The second temperature threshold is greater than the first temperature threshold.

[0059] Specifically, after the phase separation valve is closed, residual gas in the pipeline will accumulate at the phase separation valve, and the temperature at the phase separation valve will gradually rise. When T 相分离阀 Once the second temperature threshold is reached (-180℃ in this embodiment), the phase separation valve is opened to release exhaust gas; if T 相分离阀 If the second temperature threshold is not reached, the execution unit keeps the phase separation valve closed and keeps the temperature sensing module continuously acquiring T. 相分离阀 The main control unit determines in real time whether the phase separation valve needs to be reopened.

[0060] Thus, the first control cycle of the phase separation valve, starting from the initial operation of the cryogenic cryoablation system, has ended. This means the phase separation valve has undergone two opening cycles from its initial closed state, constituting the initial start-up and adjustment process. Afterward, the cryogenic cryoablation system enters a stable operation phase. During this period, the phase separation valve's opening and closing are still controlled based on temperature data, but the relevant procedures in step S100 are no longer performed. Instead, the process is followed according to the attached diagram. Figure 2 The steps within the dashed box are looped, and T... 相分离阀 Once the temperature is lowered back to the first temperature threshold or another value below the second temperature threshold, the phase separation valve can be closed again before proceeding with the subsequent opening process. This cycle continues until one cryogenic freezing and thawing process is completed.

[0061] Refer to the attached diagram. Figure 1 and Figure 2 From the perspective of the entire control process, Figure 1 The final step of opening the phase separation solenoid valve is actually a loop back to the earlier step of opening the phase separation solenoid valve in the entire control process, as shown in the attached diagram. Figure 2 As shown, in Figure 1 After the phase separation valve is opened in step S520 during the first control cycle, the control process enters... Figure 2 In the loop steps within the dashed box, throughout the entire cryogenic freezing and thawing process, the temperature is continuously adjusted according to T. 回流温度 Relationship with the magnitude of the first temperature threshold, T 相分离阀 The opening and closing of the phase separation valve is controlled by the relationship between the value of the second temperature threshold and the value of the second temperature threshold.

[0062] The technical advantages of the phase separation valve control device and corresponding control method of the present invention are shown in the attached figures. Figures 2 to 6 As shown, the parameters of the cryoablation system controlled by the method of this embodiment are significantly different from those of the cryoablation system not controlled by the method of this embodiment.

[0063] Among them, according to Figure 4 and Figure 5 As can be seen from the liquid level in the cold tank, the cryogenic ablation system controlled by the method in this embodiment has a lower consumption rate of the cryogenic working fluid. The liquid nitrogen consumption decreased from 17% to 13% after 15 minutes. Throughout the entire ablation test (24 minutes), the total liquid nitrogen consumption decreased from 27% (6.48L) to 20% (4.80L), resulting in greater working fluid conservation. According to... Figure 4 and Figure 5 The fluctuations in the liquid level of the hot tank can be seen from this. Figure 5 After being controlled by the technical solution of this invention, the fluctuation of the liquid level in the hot tank is significantly reduced, thereby reducing the burden of liquid nitrogen returning from the ablation needle on the regenerator and improving the safety of system operation.

[0064] In addition, according to Figure 6 andFigure 7 Figure 7 As can be seen from the temperature curves of the two output channels (i.e., the two low-temperature output channels controlled by the phase separation valve in the foregoing) in the foregoing, the temperature curves of the two output channels tested are basically unchanged when the phase separation valve is controlled and not controlled, and thus, after the control method of the present embodiment is performed, the temperature of the cryoablation system does not have a significant difference compared with the temperature of the system without control, and thus, the control of the present embodiment does not have adverse effects.

[0065] Embodiment 2

[0066] The present embodiment is mainly based on Embodiment 1 to further optimize the control method of the phase separation valve control device of the present application, and part of the same content (for example, steps S100-S300) can refer to Embodiment 1, which will not be described herein.

[0067] Step S400: The main control unit determines whether to close the phase separation valve according to whether the target temperature T 相分离阀 is higher than the first temperature threshold.

[0068] Step S410: If the target temperature T 相分离阀 is higher than the first temperature threshold, the execution unit maintains the current open state of the phase separation valve.

[0069] Step S420: If the target temperature T 相分离阀 is not higher than the first temperature threshold and is maintained for a preset time length, the execution unit closes the phase separation valve.

[0070] Specifically, based on the method process of Embodiment 1, when determining according to the target temperature T 相分离阀 , in order to improve the accuracy of the determination, the temperature is maintained for a preset time length when the temperature is acquired, that is, in the size relationship judgment part of T 相分离阀 and the first temperature threshold in the process shown in the accompanying drawings Figure 1 , a preset time length for judgment is set, and the size relationship of T 相分离阀 and the first temperature threshold needs to be maintained for the preset time length without change to serve as the basis for the subsequent process. The preset time length is usually 1-2 s.

[0071] Taking 1 s as an example, if the currently acquired T 相分离阀 is less than the first temperature threshold, a time point is recorded, and T 相分离阀 is continuously acquired and monitored within the preset time length after the time point. The monitoring frequency can be customized, for example, the temperature data is acquired once every 0.1 s. During the process, T 相分离阀 may change, but it always remains less than the first temperature threshold, and then the subsequent control process of closing the phase separation valve is performed. If T 相分离阀 ​If the change is greater than the first temperature threshold, the condition for closing the phase separation valve is not met, and the process returns to the step of maintaining the phase separation valve open and the corresponding control process is performed again.

[0072] In addition, taking 1s as an example, if the current acquired T 相分离阀 is less than the first temperature threshold, the value of T 相分离阀 may also be acquired again after 1s, and the relationship between the acquired value and the first temperature threshold is determined again. If the result of the determination is that T 相分离阀 is less than the first temperature threshold, the condition for closing the phase separation valve is met, otherwise, the condition is not met. In this way, the temperature data in the preset time period is not acquired, and the determination process is simplified.

[0073] Embodiment 3

[0074] With reference to the accompanying drawings Figure 3 , this embodiment mainly further optimizes the control method process of the phase separation valve control device of the application based on Embodiment 1 and Embodiment 2. Part of the same content (for example, steps S100-S300 and steps S400) can be referred to Embodiment 1 and Embodiment 2, and this embodiment will not be described in detail.

[0075] Step S500: The main control unit determines whether to open the phase separation valve again according to the temperature data acquired by the temperature sensing module;

[0076] Step S510: The temperature sensing module acquires the current target temperature T 相分离阀 at the exhaust port of the phase separation valve again;

[0077] Step S520: When the target temperature T 相分离阀 reaches the second temperature threshold or above, the execution unit opens the phase separation valve after a delay of N seconds according to the set delay time N, and the second temperature threshold is greater than the first temperature threshold;

[0078] Specifically, this embodiment mainly sets the delay time for opening the phase separation valve when the target temperature T 相分离阀 reaches the second temperature threshold or above, and the delay is to ensure that the influence of temperature transient fluctuation is excluded. The setting of the delay time N can be performed when the cryoablation system is started, or an initial value is preset, and the delay time N is directly reset to the initial value when the cryoablation system is started. In this embodiment, N is in the range of [1, 10], and with reference to the accompanying drawings Figure 3 , the initial value of this embodiment is N=1s.

[0079] Step S530: After opening the phase separation valve according to the target temperature T 相分离阀 and the second temperature threshold, the main control unit updates the delay time N when determining whether to close the phase separation valve next time.

[0080] Step S531: If the acquired return temperature T 回流温度 of the cryogenic output channel of the cryogenic ablation system is higher than the first temperature threshold, then while keeping the current open state of the phase separation valve, the delay time N=N-1 is decremented, and the step of decrementing the delay time N=N-1 is performed only once before the return temperature T 回流温度 decreases to not higher than the first temperature threshold.

[0081] Step S532: If the acquired return temperature T 回流温度 of the cryogenic output channel of the cryogenic ablation system is not higher than the first temperature threshold, then before entering the control of closing the phase separation valve, the delay time N=N+1 is incremented.

[0082] Specifically, the improvement of the control method flow of the present embodiment is mainly the loop control part in the dashed box in the attached figure Figure 3 , which is performed after the target temperature T 相分离阀 is compared with the second temperature threshold to open the phase separation valve. 回流温度 After the phase separation valve is opened and closed, the previous acquisition of the return temperature T 回流温度 and the related judgment flow are performed again, and the delay time is updated in the process. The delay time is used to exclude the influence of temperature transient fluctuation when the phase separation valve is opened, and to improve the accuracy of the temperature as the control basis. However, if after a round of opening and closing control, in the next judgment process, the return temperature T 相分离阀 of the cryogenic output channel is still higher than the first temperature threshold, then it is indicated that the system has not yet reached the ablation temperature, and the phase separation valve should be opened as soon as possible when needed, so the delay time N=N-1 is decremented, that is, when the target temperature T 回流温度 is compared with the second temperature threshold to open the phase separation valve next time, the delay is shorter and the opening is faster. If after a round of opening and closing of the phase separation valve, in the next judgment process, the return temperature T 相分离阀 of the cryogenic output channel is not higher than the first temperature threshold, then it is indicated that the previous closing of the phase separation valve does not affect the cryogenic ablation effect, and the phase separation valve can be delayed longer when needed, so the delay time N=N+1 is incremented, that is, when the target temperature T 相分离阀 is compared with the second temperature threshold to open the phase separation valve next time, the delay is longer and the opening is slower.

[0083] In addition, when the corresponding temperature does not reach the preset condition, the temperature is detected continuously or intermittently according to the preset scheme. For example, in the attached figure Figure 3 , if the return temperature T 回流温度 does not meet the condition of not higher than the first temperature threshold at step S531, the open state of the phase separation valve is maintained, the step of N=N-1 is performed, and thereafter the return temperature T 回流温度and compared with the first temperature threshold. In the subsequent comparison process, if the backflow temperature T 回流温度 Still does not satisfy the first temperature threshold, at this time, in the judgment of the need to continue to maintain the open state of the phase separation valve, it can be selected whether to execute N=N-1 step again. In this embodiment, in the subsequent comparison process, N=N-1 step is not executed again, that is, in the backflow temperature T 回流温度 In the multiple judgment and control processes before reaching the first temperature threshold, N=N-1 step is executed only once, avoiding the rapid decrease of N value or becoming negative value caused by multiple executions of this step in a short time. Of course, a minimum value can also be set in advance, and whether to execute N=N-1 in step S531 is determined based on the size relationship between the current N value and the minimum value; for example, the value range of the aforementioned N is [1, 10], and the minimum value is 1, so in step S531, the size relationship between the current N value and 1 can be further judged, and when the current N is greater than 1, the N=N-1 step is selected to be executed, and after the N value is reduced to 1, the N=N-1 step is not executed in the subsequent control process.

[0084] Embodiment 4

[0085] The embodiment of the present application provides a low-temperature cryoablation system, which comprises a phase separation valve arranged on a low-temperature medium pipeline and the phase separation valve control device described above, and further has all the technical effects possessed thereby.

[0086] As shown in the accompanying drawings Figure 8 The low-temperature cryoablation system further comprises an ablation needle in communication with the low-temperature medium pipeline or an ablation needle configured with the low-temperature medium pipeline, a working medium input and output device, a back heat exchanger at the rear end, etc., the working medium flows back to the back heat exchanger after ablation operation by the ablation needle, is re-circulated to the input after re-cooling in the back heat exchanger, and in this process, the gas generated by the gasification of the working medium is discharged based on the temperature change through the phase separation valve and the control method of the phase separation valve. In principle, the exhaust is mainly in the backflow stage, but it is also possible to exhaust in the input stage according to the situation, and the two exhaust structures of the phase separation valve can operate independently.

[0087] The above devices are assembled to constitute a low-temperature cryoablation system, and the structure and assembly method of the corresponding devices are not the main improvement points of the present application, and can refer to the prior art, which will not be described here.

[0088] In the description of the application, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like are terms of convenience and are not to be construed as limiting upon the claims set forth below. In addition, these terms used in describing the application should be interpreted only as examples. They can be interchanged under appropriate circumstances.

[0089] While the application has been described with reference to particular embodiments, it will be understood that the examples are merely there to illustrate the principles and applications of the present application. It should therefore be understood that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It will be understood that the features described in relation to one embodiment can be used in other embodiments.

Claims

1. A phase separation valve control device, characterized by, The switch control module is configured to, during stable operation of the low-temperature refrigeration ablation system, The switch control module is configured to, during stable operation of the low-temperature refrigeration ablation system, when the phase separation valve is in a closed state, if the current target temperature T 相分离阀 greater than or equal to the second temperature threshold, open the phase separation valve after a delay of N seconds; and after opening the phase separation valve, update the delay time N when judging whether to close the phase separation valve next time. and The backflow temperature T of the cryogenic output channel of the cryogenic cryoablation system 回流温度 If the temperature is higher than the first temperature threshold, the delay time N is updated to N-1 and the phase separation valve is kept in its current open state. The second temperature threshold is greater than the first temperature threshold. at said reflux temperature T 回流温度 not higher than said first temperature threshold, updating the delay time N to N+1 and closing said phase separation valve; The value of the delay time N is in the range of [1, 10].

2. The phase separation valve control apparatus according to claim 1, characterized by The switch control module is configured to, when the backflow temperature T of the cryogenic output channel of the cryogenic ablation system is lower than the first temperature threshold value 回流温度 When the first temperature threshold value is exceeded, the update process of updating the delay seconds N to N-1 is executed once.

3. The phase separation valve control device according to claim 1 or 2, characterized by The temperature sensing module is further configured to 4. The phase separation valve control device according to claim 1 or 2, characterized by The phase separation valve is arranged on the low-temperature medium pipeline, and the phase separation valve control device is as claimed in any one of claims 1 to 7. The temperature sensing module is configured to continuously or re-detect the temperature every preset time to obtain the reflow temperature T 回流温度 and the target temperature T 相分离阀 .

5. The phase separation valve control apparatus of claim 4, wherein The switch control module is further configured to control whether to close the phase separation valve according to whether the target temperature T 相分离阀 is higher than a first temperature threshold during a start-up adjustment process of the low-temperature cryoablation system.

6. The phase separation valve control apparatus of claim 5, wherein The switch control module is further configured to, during a start-up adjustment process of the low-temperature cryoablation system, control whether to close the phase separation valve according to a size relationship between the target temperature T 相分离阀 and the first temperature threshold value. When the target temperature T 相分离阀 is higher than the first temperature threshold value, a size relationship between the target temperature T and the first temperature threshold value is maintained unchanged for a preset time length as a basis for controlling whether to close the phase separation valve.

7. The phase separation valve control apparatus of claim 6, wherein The temperature sensing module is configured to continuously acquire the target temperature T at a self-defined monitoring frequency within a preset time length 相分离阀 or acquire the target temperature T at the first and last time of the preset time length 相分离阀 .

8. A cryogenic cryoablation system, comprising: ​

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