Pressure dual control system of compliant freezing balloon

Abstract

The invention provides a pressure dual control system of a compliance freezing balloon, and relates to the technical field of medical equipment, the system comprises a refrigerant input module, a balloon, a first pressure detection device, a first proportional valve, a vacuum pump, a flowmeter and a control module; the first pressure detection device is used for detecting internal pressure information of the balloon and sending the internal pressure information to the control module, the flowmeter is used for detecting gas flow information at the output end of the vacuum pump and sending the gas flow information to the control module, and the control module can adjust the internal pressure of the balloon through two control strategies, the other mode is that the opening degree of the first proportional valve is kept unchanged, and the gas flow at the output end of the vacuum pump is adjusted, so that the internal pressure of the balloon can be adjusted by adjusting the gas flow at the output end of the vacuum pump after the adjustment range of the first proportional valve is exceeded, and the pressure adjustment range can be expanded; and the large-range adjustment requirement of a user is met.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a dual pressure control system of a compliant cryoballoon. Background Art

[0002] Cryoballoon ablation is a surgical procedure for interventional treatment of atrial fibrillation. It uses low temperature to ablate the myocardium, causing the tissue cells around the pulmonary veins to degenerate and necrotize, lose the ability to conduct electricity, and achieve the purpose of pulmonary vein ablation. This method can effectively control atrial fibrillation attacks, reduce the risk of stroke, and improve the quality of life of patients. During the operation, a ring mapping catheter is placed in the patient's heart to locate and evaluate the ablation area. Behind the ring mapping catheter is a retractable cryoballoon catheter. A balloon is set at the distal end of the cryoballoon catheter. After the balloon reaches the surgical site, the balloon is expanded to block the opening of the pulmonary vein. The liquid refrigerant in the balloon evaporates and absorbs heat, causing the temperature around the ablation target to drop suddenly, resulting in extracellular and intracellular crystallization and tissue freezing ischemia, thereby causing tissue damage and achieving a single isolation of the pulmonary vein.

[0003] Initially, cryoballoons were designed with a uniform non-compliant design, meaning that the maximum size of the balloon after expansion does not change with the pressure inside it. However, in clinical applications, since cryoablation requires ablating each of the patient's four pulmonary vein openings, when the four openings are of different sizes or the patient has a common pulmonary vein variation, multiple cryoballoons of different sizes need to be used in one operation, increasing the cost and complexity of the operation. To solve this problem, a compliant cryoballoon design was proposed, which can adjust the size of the balloon by stably controlling the internal pressure of the balloon, so that a balloon can adapt to ablation operations of pulmonary vein openings of different sizes and anatomical structures.

[0004] In order to achieve a stable wall adhesion effect during the ablation process, the compliant cryoballoon needs to maintain its stable size. This requires that the corresponding ablation system can accurately control the pressure inside the balloon during balloon expansion and cryoablation to ensure that it remains constant. Figure 1 Schematic diagram of the structure of an internal pressure control system of a compliant cryoballoon in the prior art. Figure 1 As shown, the third PID controller 101 is for the purpose of making the flow rate of the refrigerant (N2O is used as an example in the figure) input into the balloon 105 reach the corresponding set value, and controls the opening of the second proportional valve 102 to achieve and maintain the inside and surrounding tissues of the balloon at a suitable low temperature. The first PID controller 107 is for the purpose of making the pressure inside the balloon 105 reach the corresponding set value, and controls the opening of the first proportional valve 108 to achieve the balloon size at the set size. Among them, the pressure inside the balloon is proportional to the balloon size. Under a given balloon size, the temperature inside the balloon is proportional to the refrigerant flow rate.

[0005] However, for the internal pressure control module of the balloon, the first proportional valve used in the prior art is an electromagnetic proportional valve. Due to the electromagnetic proportional valve itself, its pressure control can only be carried out within a certain range of its own opening. If it exceeds this range, the opening has almost no effect on the pressure regulation, which makes the prior art have the problem of a small pressure regulation range. Summary of the invention

[0006] In view of this, a dual pressure control system for a compliant cryoballoon is provided to solve the problem of a small pressure regulation range in the prior art.

[0007] The present invention adopts the following technical solution:

[0008] A pressure dual control system for a compliant cryoballoon, comprising: a refrigerant input module, a balloon, a first pressure detection device, a first proportional valve, a vacuum pump, a flow meter and a control module;

[0009] The refrigerant input module is arranged at the input end of the balloon, and is used to input refrigerant into the balloon, and to control the flow of the refrigerant input into the balloon so as to reach the target refrigerant flow;

[0010] The two ends of the first proportional valve are respectively connected to the output end of the balloon and the input end of the vacuum pump, the output end of the vacuum pump is connected to the flow meter, the first pressure detection device is used to detect the internal pressure information of the balloon and send it to the control module, the flow meter is used to detect the gas flow information at the output end of the vacuum pump and send it to the control module; the control module is used to determine whether it is currently in one of all preset control areas according to the internal pressure information of the balloon and the opening of the first proportional valve when it is determined that the internal pressure of the balloon needs to be adjusted to the target pressure, and if it is currently in all preset control areas, If one of the control areas is set, the control module executes the control strategy corresponding to the current target preset control area, and the preset control area includes a proportional valve opening control area and a vacuum pump gas flow control area. The control strategy corresponding to the proportional valve opening control area is to maintain the gas flow at the output end of the vacuum pump stable and adjust the opening of the first proportional valve to adjust the internal pressure of the balloon to the target pressure. The control strategy corresponding to the vacuum pump gas flow control area is to maintain the opening of the first proportional valve unchanged and adjust the gas flow at the output end of the vacuum pump to adjust the internal pressure of the balloon to the target pressure.

[0011] Optionally, the control module includes a first PID controller, a second PID controller and a master controller;

[0012] The first end of the first PID controller is connected to the first pressure detection device, the second end is connected to the master controller, and the third end is connected to the first proportional valve;

[0013] The first end of the second PID controller is connected to the first pressure detection device, the second end is connected to the master controller, and the third end is connected to the vacuum pump and the flow meter;

[0014] The master controller is also connected to the first pressure detection device.

[0015] Optionally, when the target preset control area is the proportional valve opening control area, the control module executes a control strategy corresponding to the current target preset control area, specifically including:

[0016] The master controller sends a first control instruction carrying the target pressure to the first PID controller, and sends a second control instruction to the second PID controller;

[0017] After receiving the first control instruction, the first PID controller parses the first control instruction to obtain the target pressure, obtains the internal pressure information of the balloon through the first pressure detection device, and adjusts the opening of the first proportional valve for the purpose of adjusting the internal pressure of the balloon to the target pressure;

[0018] After receiving the second control instruction, the second PID controller adjusts the operating parameters of the vacuum pump according to the second control instruction so as to maintain the gas flow at the output end of the vacuum pump stable.

[0019] Optionally, when the target preset control area is the vacuum pump gas flow control area, the control module executes a control strategy corresponding to the current target preset control area, specifically including:

[0020] The master controller sends a third control instruction to the first PID controller, and sends a fourth control instruction carrying the target pressure to the second PID controller;

[0021] When receiving the third control instruction, the first PID controller performs control according to the third control instruction to maintain the opening of the first proportional valve unchanged;

[0022] When receiving the fourth control instruction, the second PID controller parses the fourth control instruction to obtain the target pressure, obtains the internal pressure information of the balloon through the first pressure detection device, and adjusts the operating parameters of the vacuum pump for the purpose of adjusting the internal pressure of the balloon to the target pressure.

[0023] Optionally, the dual pressure control system of the compliant cryoballoon of the present invention further includes: a communication module;

[0024] The communication module is communicatively connected to the control module, and is used to support the control module to communicate with an external intelligent device.

[0025] Optionally, the control module is further used for:

[0026] When it is determined that the device is not currently in any of the preset control areas, a preset prompt message is sent to an external smart device through the communication module.

[0027] Optionally, the dual pressure control system of the compliant cryoballoon of the present invention further includes: a user interaction device;

[0028] The user interaction device is communicatively connected with the control module.

[0029] Optionally, the user interaction device is a touch screen.

[0030] The present invention adopts the above technical scheme. By setting a first pressure detection device, a first proportional valve, a vacuum pump, a flow meter and a control module, the control module can adjust the internal pressure of the balloon through two control strategies. One is to maintain the gas flow at the output end of the vacuum pump stable and adjust the opening of the first proportional valve. The other is to maintain the opening of the first proportional valve unchanged and adjust the gas flow at the output end of the vacuum pump. In this way, after exceeding the adjustment range of the first proportional valve, the internal pressure of the balloon can be adjusted by adjusting the gas flow at the output end of the vacuum pump, so that the present invention can expand the pressure adjustment range and meet the user's wide range adjustment needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of an internal pressure control system of a compliant cryoballoon in the prior art;

[0033] Figure 2 It is a schematic structural diagram of a pressure dual control system of a compliant cryoballoon provided in an embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram of the corresponding relationship between the opening of the first proportional valve and the gas flow at the output end of the vacuum pump and the internal pressure of the balloon when the power and inlet pressure of the compressor remain unchanged. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0036] Cryoballoon ablation is a surgical procedure for interventional treatment of atrial fibrillation. It uses low temperature to ablate the myocardium, causing the tissue cells around the pulmonary veins to degenerate and necrotize, lose the ability to conduct electricity, and achieve the purpose of pulmonary vein ablation. This method can effectively control atrial fibrillation attacks, reduce the risk of stroke, and improve the quality of life of patients. During the operation, a ring mapping catheter is placed in the patient's heart to locate and evaluate the ablation area. Behind the ring mapping catheter is a retractable cryoballoon catheter. A balloon is set at the distal end of the cryoballoon catheter. After the balloon reaches the surgical site, the balloon is expanded to block the opening of the pulmonary vein. The liquid refrigerant in the balloon evaporates and absorbs heat, causing the temperature around the ablation target to drop suddenly, resulting in extracellular and intracellular crystallization and tissue freezing ischemia, thereby causing tissue damage and achieving a single isolation of the pulmonary vein.

[0037] Initially, cryoballoons were designed with a uniform non-compliant design, meaning that the maximum size of the balloon after expansion does not change with the pressure inside it. However, in clinical applications, since cryoablation requires ablating each of the patient's four pulmonary vein openings, when the four openings are of different sizes or the patient has a common pulmonary vein variation, multiple cryoballoons of different sizes need to be used in one operation, increasing the cost and complexity of the operation. To solve this problem, a compliant cryoballoon design was proposed, which can adjust the size of the balloon by stably controlling the internal pressure of the balloon, so that a balloon can adapt to ablation operations of pulmonary vein openings of different sizes and anatomical structures.

[0038] In order to achieve a stable wall adhesion effect during the ablation process, the compliant cryoballoon needs to maintain its stable size. This requires that the corresponding ablation system can accurately control the pressure inside the balloon during balloon expansion and cryoablation to ensure that it remains constant. Figure 1 The figure is a schematic diagram of the structure of an internal pressure control system of a compliant cryoballoon in the prior art. The internal pressure of the balloon is proportional to the balloon size. Under a given balloon size, the temperature inside the balloon is proportional to the refrigerant flow rate. Figure 1As shown, the second pressure detection device 103 obtains the injection pressure information at the inlet of the compressor 104 and sends it to the third PID controller 101. The third PID controller 101 is for the purpose of making the flow of the refrigerant input into the balloon 105 reach the corresponding set value. According to the injection pressure information received, the opening of the second proportional valve 102 is controlled to achieve and maintain the inside and surrounding tissues of the balloon at a suitable low temperature. The first pressure detection device 106 obtains the internal pressure information of the balloon 105 and sends it to the first PID controller 107. The first PID controller 107 is for the purpose of making the pressure inside the balloon 105 reach the corresponding set value. According to the internal pressure information received, the opening of the first proportional valve 108 is controlled to achieve the balloon size at the set size. The third pressure detection device 109 is used to detect the pressure of the gas flowing into the vacuum pump 110 and display it to facilitate the staff to know the pressure of the gas flowing into the vacuum pump 110. Under the suction action of the vacuum pump 110, the gas flowing out of the first proportional valve 108 is discharged outside the control system through the flowmeter 111.

[0039] However, for the internal pressure control module of the balloon, the first proportional valve used in the prior art is an electromagnetic proportional valve. Due to the electromagnetic proportional valve itself, its pressure control can only be carried out within a certain range of its own opening. If it exceeds this range, the opening has almost no effect on the pressure regulation, which makes the prior art have the problem of a small pressure regulation range.

[0040] Based on this, in order to expand the balloon pressure adjustment range and meet the user's wide range adjustment needs, the present invention provides a pressure dual control system for a compliant cryoballoon. The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0041] Figure 2 FIG. 1 is a schematic diagram of a pressure dual control system of a compliant cryoballoon provided in an embodiment of the present invention. Figure 2 As shown, the pressure dual control system of the compliant cryoballoon includes: a refrigerant input module ( Figure 2The control module includes a first PID controller 107, a second PID controller 201 and a master controller 202. The first end of the first PID controller 107 is connected to the first pressure detection device 106, the second end is connected to the master controller 202, and the third end is connected to the first proportional valve 108. The first end of the second PID controller 201 is connected to the first pressure detection device 106, the second end is connected to the master controller 202, and the third end is connected to the vacuum pump 110 and the flow meter 111. The master controller 202 is also connected to the first pressure detection device 106. Specifically, the master controller 202 can be connected to the first pressure detection device 106 by wireless communication.

[0042] The refrigerant input module is arranged at the input end of the balloon, and is used to input refrigerant into the balloon, and control the flow of the refrigerant input into the balloon to reach the target refrigerant flow. It should be noted that the refrigerant input module is a prior art. For example, the refrigerant input module can be used as follows Figure 1 The prior art shown, that is, the refrigerant input module includes a third PID controller 101, a second proportional valve 102, a second pressure detection device 103 and a compressor 104. The first end of the second proportional valve 102 is connected to the input end of the compressor 104, and the second end is used to connect the refrigerant storage device (the figure takes the refrigerant as N2O as an example for explanation). The first end of the third PID controller 101 is connected to the input end of the compressor 104 through the second pressure detection device 103, and the second end is connected to the second end of the second proportional valve 102. After the second pressure detection device 103 obtains the injection pressure information at the inlet of the compressor 104, the injection pressure information is sent to the third PID controller 101. The third PID controller 101 controls the opening of the second proportional valve 102 according to the injection pressure information in order to make the flow rate of the refrigerant in the input balloon 105 reach the target refrigerant flow rate; the refrigerant in the refrigerant storage device passes through the second proportional valve 102 and is sent into the balloon 105 by the compressor 104. It should be noted that the present invention may also adopt other refrigerant injection modules in the prior art, as long as the present invention can be implemented, and the present invention is not specifically limited here.

[0043] The two ends of the first proportional valve 108 are respectively connected to the output end of the balloon 105 and the input end of the vacuum pump 110. The output end of the vacuum pump 110 is connected to the flow meter 111. The first pressure detection device 106 is used to detect the internal pressure information of the balloon 105 and send it to the control module. The flow meter 111 is used to detect the gas flow information at the output end of the vacuum pump 110 and send it to the control module. The control module is used to obtain the internal pressure information of the balloon through the first pressure detection device 106 when it is determined that the internal pressure of the balloon needs to be adjusted to the target pressure, and obtain the opening of the first proportional valve 108 through the first PID controller 107. According to the internal pressure information of the balloon and the opening of the first proportional valve 108 The control module determines whether it is currently in one of all preset control areas. If it is currently in one of all preset control areas, the control module executes the control strategy corresponding to the current target preset control area. The preset control area includes a proportional valve opening control area and a vacuum pump gas flow control area. The control strategy corresponding to the proportional valve opening control area is to maintain the gas flow at the output end of the vacuum pump 110 stable, and adjust the opening of the first proportional valve 108 to adjust the internal pressure of the balloon 105 to the target pressure. The control strategy corresponding to the vacuum pump gas flow control area is to maintain the opening of the first proportional valve 108 unchanged, and adjust the gas flow at the output end of the vacuum pump 110 to adjust the internal pressure of the balloon to the target pressure.

[0044] Specifically, Figure 3 It is a schematic diagram of the corresponding relationship between the opening of the first proportional valve and the gas flow at the output end of the vacuum pump and the internal pressure of the balloon when the power and inlet pressure of the compressor remain unchanged. Figure 3 As shown, each curve represents the curve of the change of the internal pressure of the balloon with the change of the opening of the first proportional valve when the gas flow FM at the output end of the vacuum pump is equal to a certain constant value. Among them, the unit of the gas flow at the output end of the vacuum pump is ml / min, FM=6K means that the gas flow at the output end of the vacuum pump is equal to 6000ml / min, FM=7K means that the gas flow at the output end of the vacuum pump is equal to 7000ml / min, and the same applies to the others. Analysis of all the curves shows that the internal pressure of the balloon is not only related to the opening of the first proportional valve, but also to the gas flow at the output end of the vacuum pump.

[0045] Based on this, the present invention divides the entire image area into a non-control area, a proportional valve opening control area, and a vacuum pump gas flow control area. In the non-control area, since the internal pressure of the balloon is relatively high, the target pressure of the balloon is often not set to be so high in actual applications. Therefore, the present invention does not adjust the balloon pressure in the non-control area.

[0046] When the target preset control area is the proportional valve opening control area, the control module executes the control strategy corresponding to the current target preset control area, which may specifically include:

[0047] (1) The master controller 202 sends a first control instruction carrying a target pressure to the first PID controller 107 , and sends a second control instruction to the second PID controller 201 .

[0048] (2) After receiving the first control instruction, the first PID controller 107 analyzes the first control instruction to obtain the target pressure, obtains the internal pressure information of the balloon 105 through the first pressure detection device 106, and adjusts the opening of the first proportional valve 108 for the purpose of adjusting the internal pressure of the balloon 105 to the target pressure. And, after receiving the second control instruction, the second PID controller 201 adjusts the operating parameters of the vacuum pump 110 according to the second control instruction for the purpose of maintaining the gas flow at the output end of the vacuum pump 110 stable.

[0049] Combine the following Figure 3 , explaining the above scheme.

[0050] Assume that balloon 105 has a first size D1, a second size D2 and a third size D3. Since the internal pressure of the balloon is proportional to the size of the balloon, the internal pressure P1 of the first balloon can be calculated based on the first size D1, the internal pressure P2 of the second balloon can be calculated based on the second size D2, and the internal pressure P3 of the third balloon can be calculated based on the third size D3.

[0051] In the proportional valve opening control area, it is assumed that the current point is A, that is, the internal pressure of the balloon is equal to P1, the opening of the first proportional valve 108 is equal to 10%, the gas flow at the output end of the vacuum pump 110 is equal to 8K, and the target pressure is P2, that is, it needs to be adjusted to point B. In this case, the main controller 202 sends a first control instruction carrying the target pressure (i.e., P2) to the first PID controller 107, and sends a second control instruction to the second PID controller 201. After receiving the first control instruction, the first PID controller 107 parses the first control instruction to obtain the target pressure, and uses the first pressure detection device 201 to detect the target pressure. The device 106 obtains the internal pressure information of the balloon 105, and adjusts the opening of the first proportional valve 108 for the purpose of adjusting the internal pressure of the balloon 105 to the target pressure, and finally adjusts the opening of the first proportional valve 108 to 30%. At the same time, after receiving the second control instruction, the second PID controller 201 responds to the second control instruction and obtains the gas flow information of its output end through the flow meter 111, and determines that the gas flow of its output end is equal to 8K according to the gas flow information, and then adjusts the operating parameters of the vacuum pump 110 for the purpose of maintaining the gas flow of the output end of the vacuum pump 110 stable at 8K. In this way, the internal pressure of the balloon is adjusted to P2, the opening of the first proportional valve 108 is adjusted to 30%, and the gas flow of the output end of the vacuum pump 110 is maintained at 8K. Similarly, the internal pressure of the balloon can also be adjusted to P3 while maintaining the gas flow of the output end of the vacuum pump 110 equal to 8K.

[0052] When the target preset control area is the vacuum pump gas flow control area, the opening of the first proportional valve 108 is already relatively large. At this time, it is difficult to adjust the internal pressure of the balloon by adjusting the opening of the first proportional valve 108. Therefore, in this case, the internal pressure of the balloon is adjusted by keeping the opening of the first proportional valve 108 unchanged and adjusting the gas flow at the output end of the vacuum pump 110. Based on this, the control module executes the control strategy corresponding to the current target preset control area, which may specifically include:

[0053] (1) The overall controller 202 sends the third control instruction to the first PID controller 107 , and sends the fourth control instruction carrying the target pressure to the second PID controller 201 .

[0054] (2) When the first PID controller 107 receives the third control instruction, it performs control according to the third control instruction for the purpose of maintaining the opening of the first proportional valve 108 unchanged; and when the second PID controller 201 receives the fourth control instruction, it parses the fourth control instruction to obtain the target pressure, obtains the internal pressure information of the balloon 105 through the first pressure detection device 106, and adjusts the operating parameters of the vacuum pump 110 for the purpose of adjusting the internal pressure of the balloon 105 to the target pressure.

[0055] Continuing with the previous example, Figure 3 , explaining the above scheme.

[0056] In the gas flow control area of ​​the vacuum pump, assuming that it is currently at point C, that is, the internal pressure of the balloon is equal to P1, the opening of the first proportional valve 108 is equal to 80%, the gas flow at the output end of the vacuum pump 110 is equal to 6K, and the target pressure is P2, that is, it needs to be adjusted to point D. In this case, the main controller 202 sends a third control instruction to the first PID controller 107, and sends a fourth control instruction carrying the target pressure (ie, P2) to the second PID controller 201. When the first PID controller 107 receives the third control instruction, it responds to the third control instruction, detects the opening of the first proportional valve 108, obtains the opening of the first proportional valve 108 equal to 80%, and controls the first proportional valve 108 to maintain the opening of 80% for the purpose of controlling; and, when the second PID controller 201 receives the fourth control instruction, it parses the fourth control instruction to obtain the target pressure, obtains the internal pressure information of the balloon 105 through the first pressure detection device 106, and adjusts the operating parameters of the vacuum pump 110 for the purpose of adjusting the internal pressure of the balloon 105 to the target pressure, so that the gas flow rate at the output end of the vacuum pump 110 is adjusted to 7K. In this way, the internal pressure of the balloon is adjusted to P2, the opening of the first proportional valve 108 is kept at 80%, and the gas flow rate at the output end of the vacuum pump 110 is adjusted to 7K. Similarly, the internal pressure of the balloon can also be adjusted to P3 while maintaining the opening of the first proportional valve 108 at 80%.

[0057] The embodiment of the present invention adopts the above technical solution. By setting a first pressure detection device, a first proportional valve, a vacuum pump, a flow meter and a control module, the control module can adjust the internal pressure of the balloon through two control strategies. One is to maintain the gas flow at the output end of the vacuum pump stable and adjust the opening of the first proportional valve. The other is to maintain the opening of the first proportional valve unchanged and adjust the gas flow at the output end of the vacuum pump. In this way, after exceeding the adjustment range of the first proportional valve, the internal pressure of the balloon can be adjusted by adjusting the gas flow at the output end of the vacuum pump, so that the present invention can expand the pressure adjustment range and meet the user's wide range adjustment needs.

[0058] In the embodiment of the present invention, the dual pressure control system of the compliant cryoballoon of the present invention may further include: a communication module;

[0059] The communication module is communicatively connected with the control module, and is used to support the communication between the control module and an external intelligent device.

[0060] Specifically, the communication module may include a wired communication module and / or a wireless communication module. The communication module may be connected to the master controller 202 for communication, so that the master controller 202 may communicate with an external intelligent device through the communication module.

[0061] In the embodiment of the present invention, the control module may also be used for:

[0062] When it is determined that the device is not currently in any of the preset control areas, a preset prompt message is sent to an external smart device through the communication module.

[0063] Specifically, when the master controller 202 determines that the device is currently in the non-control area based on the internal pressure information of the balloon and the opening of the first proportional valve 108, it sends a preset prompt message to the external smart device through the communication module to prompt the user that the device is currently in the non-control area.

[0064] In an embodiment of the present invention, the dual pressure control system of the compliant cryoballoon of the present invention may further include: a user interaction device;

[0065] The user interaction device is communicatively connected with the control module.

[0066] Specifically, the user interaction device can be communicatively connected with the main controller 202, so that the user can input control instructions to the main controller 202 through the user interaction device, such as inputting control instructions to adjust the internal pressure of the balloon to the target pressure, and the user interaction device can also display relevant data sent by the main controller 202, for example, displaying relevant prompt information, etc.

[0067] In the embodiment of the present invention, the user interaction device may be a touch screen.

[0068] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0069] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A dual pressure control system for a compliant cryoballoon, characterized in that: include: Refrigerant input module, balloon, first pressure detection device, first proportional valve, vacuum pump, flow meter and control module; The refrigerant input module is arranged at the input end of the balloon, and is used to input refrigerant into the balloon, and to control the flow of the refrigerant input into the balloon so as to reach the target refrigerant flow; The two ends of the first proportional valve are respectively connected to the output end of the balloon and the input end of the vacuum pump, the output end of the vacuum pump is connected to the flow meter, the first pressure detection device is used to detect the internal pressure information of the balloon and send it to the control module, the flow meter is used to detect the gas flow information at the output end of the vacuum pump and send it to the control module; the control module is used to determine whether it is currently in one of all preset control areas according to the internal pressure information of the balloon and the opening of the first proportional valve when it is determined that the internal pressure of the balloon needs to be adjusted to the target pressure, and if it is currently in all preset control areas, If one of the control areas is set, the control module executes the control strategy corresponding to the current target preset control area, and the preset control area includes a proportional valve opening control area and a vacuum pump gas flow control area. The control strategy corresponding to the proportional valve opening control area is to maintain the gas flow at the output end of the vacuum pump stable and adjust the opening of the first proportional valve to adjust the internal pressure of the balloon to the target pressure. The control strategy corresponding to the vacuum pump gas flow control area is to maintain the opening of the first proportional valve unchanged and adjust the gas flow at the output end of the vacuum pump to adjust the internal pressure of the balloon to the target pressure.

2. The dual pressure control system of the compliant cryoballoon according to claim 1, characterized in that: The control module includes a first PID controller, a second PID controller and a master controller; The first end of the first PID controller is connected to the first pressure detection device, the second end is connected to the master controller, and the third end is connected to the first proportional valve; The first end of the second PID controller is connected to the first pressure detection device, the second end is connected to the master controller, and the third end is connected to the vacuum pump and the flow meter; The master controller is also connected to the first pressure detection device.

3. The dual pressure control system of the compliant cryoballoon according to claim 2, characterized in that: When the target preset control area is the proportional valve opening control area, the control module executes the control strategy corresponding to the current target preset control area, specifically including: The master controller sends a first control instruction carrying the target pressure to the first PID controller, and sends a second control instruction to the second PID controller; After receiving the first control instruction, the first PID controller parses the first control instruction to obtain the target pressure, obtains the internal pressure information of the balloon through the first pressure detection device, and adjusts the opening of the first proportional valve for the purpose of adjusting the internal pressure of the balloon to the target pressure; After receiving the second control instruction, the second PID controller adjusts the operating parameters of the vacuum pump according to the second control instruction so as to maintain the gas flow at the output end of the vacuum pump stable.

4. The dual pressure control system of the compliant cryoballoon according to claim 2, characterized in that: When the target preset control area is the vacuum pump gas flow control area, the control module executes the control strategy corresponding to the current target preset control area, specifically including: The master controller sends a third control instruction to the first PID controller, and sends a fourth control instruction carrying the target pressure to the second PID controller; When receiving the third control instruction, the first PID controller performs control according to the third control instruction to maintain the opening of the first proportional valve unchanged; When receiving the fourth control instruction, the second PID controller parses the fourth control instruction to obtain the target pressure, obtains the internal pressure information of the balloon through the first pressure detection device, and adjusts the operating parameters of the vacuum pump for the purpose of adjusting the internal pressure of the balloon to the target pressure.

5. The dual pressure control system of the compliant cryoballoon according to claim 1, characterized in that: Also includes: Communication module; The communication module is communicatively connected to the control module, and is used to support the control module to communicate with an external intelligent device.

6. The dual pressure control system of the compliant cryoballoon according to claim 5, characterized in that: The control module is also used for: When it is determined that the device is not currently in any of the preset control areas, a preset prompt message is sent to an external smart device through the communication module.

7. The dual pressure control system of the compliant cryoballoon according to claim 1, characterized in that: Also includes: user interaction device; The user interaction device is communicatively connected with the control module.

8. The dual pressure control system of the compliant cryoballoon according to claim 7, characterized in that: The user interaction device is a touch screen.

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