Steam ablation device

Abstract

The present invention provides a steam ablation device, comprising a steam generator, a water level detection device, a water pump, a water level conversion circuit and a controller. The water level detection device is communicated with the steam generator. The feedback end of the water level detection device is electrically connected to the first end of the water level conversion circuit. The second end of the water level conversion circuit is electrically connected to the controller. The water pump is connected between a water source and the water inlet of the steam generator, and the water pump is configured to be controlled by the controller. The water level detection device is used for detecting the water level in the steam generator, obtaining a water level detection signal representing the current water level of the steam generator, and feeding back the current water level to the controller through the water level conversion circuit. The controller is used for controlling the water pump according to the current water level.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a steam ablation device and a water level detection method thereof. Background Art

[0002] Steam ablation is a new technology that forms high-temperature water vapor and then applies the high-temperature water vapor to the target site in a patient's body. It can be used for local tissue inflammatory reactions, injury repair, etc. Steam ablation can be applied to the bronchi, for example, but is not limited thereto.

[0003] A steam generator may be provided in a steam ablation device. During steam ablation and its preparation process, water needs to be supplied to the steam generator. During the use of the device, water level control inside the steam generator is very important. In the existing related technologies, the water level control of the steam generator is achieved through manual operation. Furthermore, the process of manual operation is inefficient, and the effect of water level control (such as whether it can accurately and timely meet the various requirements of steam ablation and its preparation work, as well as the specific accuracy and timeliness) depends on the subjective experience of the operator and the reaction during operation, and it is difficult to be guaranteed. Summary of the Invention

[0004] The present invention provides a steam ablation device to solve the problems of low efficiency and the difficulty in guaranteeing the effect of water level control.

[0005] The present invention provides a steam ablation device, including a steam generator, a water level detection device, a water pump, a water level conversion circuit, and a controller. The water level detection device is connected to the steam generator in communication. The feedback end of the water level detection device is electrically connected to the first end of the water level conversion circuit, and the second end of the water level conversion circuit is electrically connected to the controller. The water pump is connected between a water source and the water inlet of the steam generator, and the water pump is configured to be controlled by the controller;

[0006] The water level detection device is used to detect the water level in the steam generator, obtain a water level detection signal representing the current water level of the steam generator, and feedback the current water level to the controller through the water level conversion circuit;

[0007] The controller is used to control the water pump according to the current water level.

[0008] It can be seen that in the present invention, since the factors to be considered for water pump control also include the current water level, the water supply of the steam generator can match the current actual water level situation. Therefore, it is convenient to timely control the state of the water pump so that it can timely meet the current actual needs.

[0009] In addition, the control of the water pump is automatically achieved by the controller, without relying on manual operation, with high efficiency. Moreover, the control result has stability and will not change with the state, cognition, and experience of the operator.

[0010] Therefore, the present invention can accurately, timely, and efficiently automatically meet various requirements of steam ablation and its preparation work, and the control result has better stability.

[0011] Optionally, the water level detection device has a cavity, and a first water level sensor and a second water level sensor are arranged in the cavity. The cavity communicates with the steam generator.

[0012] The first water level feedback terminal of the first water level sensor is electrically connected to the first input terminal of the water level conversion circuit, and the second water level feedback terminal of the first water level sensor is electrically connected to the second input terminal of the water level conversion circuit.

[0013] The first water level sensor is used for:

[0014] When the current water level reaches the first water level, feeding back a first water level detection signal to the water level conversion circuit; when the current water level reaches the second water level, feeding back a second water level detection signal to the water level conversion circuit.

[0015] The first water level feedback terminal of the second water level sensor is electrically connected to the third input terminal of the water level conversion circuit, and the second water level feedback terminal of the second water level sensor is electrically connected to the fourth input terminal of the water level conversion circuit.

[0016] When the current water level reaches the third water level, feeding back a third water level detection signal to the water level conversion circuit; when the current water level reaches the fourth water level, feeding back a fourth water level detection signal to the water level conversion circuit.

[0017] In the above solution, the true water level in the steam generator can be indirectly reflected by detecting the water level in the cavity, avoiding directly arranging the water level sensor in the steam generator, thereby avoiding the influence of steam and the like in the steam generator on water level detection and ensuring the accuracy of water level detection.

[0018] Optionally, the first water level is the anti-dry-burning water level, the second water level is the minimum normal water level, the third water level is the maximum normal water level, and the fourth water level is the top-filling water level; the anti-dry-burning water level is lower than the minimum normal water level, the minimum normal water level is lower than the maximum normal water level, and the maximum normal water level is lower than the top-filling water level.

[0019] In the above optional solution:

[0020] The dry - burn prevention water level can reflect the basic requirement of "dry - burn prevention", providing a basis for judging whether the steam generator meets the dry - burn prevention requirement during heating. Furthermore, the pump control implemented based on this can help make the control result match the dry - burn prevention requirement during heating.

[0021] The minimum normal water level and the maximum normal water level can reflect the water usage requirements during normal steam ablation and its preparation work. Furthermore, the pump control implemented based on this can help make the control result match the actual water usage requirements.

[0022] The top - filling water level can reflect the water - holding limit of the steam generator. Furthermore, the pump control implemented based on this can help ensure the safety of water supply.

[0023] Optionally, when the controller controls the pump according to the current water level, it is specifically used for:

[0024] If the steam ablation device is in the filling state, then:

[0025] Control the pump to start, and turn off the pump after the set pump stop time ends;

[0026] According to the current water level, and the specified dry - burn prevention water level, minimum normal water level and maximum normal water level, control the pump to start again or remain closed, where the dry - burn prevention water level is lower than the minimum normal water level, and the minimum normal water level is lower than the maximum normal water level.

[0027] In the above optional solution, in the filling state, the process of first starting the pump to add water and then controlling the pump based on the specified water level can help effectively ensure that the water level can reach the requirements of subsequent pre - heating (for example, reach the minimum normal water level) when in the filling state.

[0028] At the same time, compared with the method of continuously filling water in the filling state and the scheme of not filling water anymore after filling once, the above optional solution can help subdivide and take into account different situations after water filling, making the control of the pump accurately match various real water level situations.

[0029] Optionally, according to the current water level, and the specified dry - burn prevention water level, minimum normal water level and maximum normal water level, controlling the pump to start again or remain closed includes:

[0030] If the current water level is higher than the dry - burn prevention water level and lower than the minimum normal water level, control the pump to start again, and after restarting, control the pump according to the accumulated pump start time and the current water level;

[0031] If the current water level is higher than the minimum normal water level and lower than the maximum normal water level, control the water pump to start again;

[0032] If the current water level is higher than or equal to the maximum normal water level, control the water pump to remain closed.

[0033] In the above optional solutions, by comparing and judging the current water level with the dry - running prevention water level, the minimum normal water level and the maximum normal water level, the following is achieved:

[0034] When the dry - running prevention requirement is met, by restarting the water pump when the water level is lower than the maximum normal water level, the steam generator can continue to be supplied with water, which is beneficial for ensuring that: after subsequent heating starts, there is sufficient and continuous water volume in the steam generator for forming water vapor. At the same time, by controlling the water pump to close when the water level is higher than or equal to the maximum normal water level, it is possible to avoid or reduce the constraints and potential safety hazards on the formation of water vapor caused by excessive water volume.

[0035] Optionally, controlling the water pump according to the accumulated water - pump start time and the current water level includes:

[0036] If the current water level is higher than or equal to the maximum normal water level, control the water pump to close;

[0037] After the accumulated water - pump start time reaches the set filling - time threshold, if the current water level is still lower than the minimum normal water level, an error is reported;

[0038] When the accumulated water - pump filling time does not reach the filling - time threshold, if the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, control the water pump to remain started.

[0039] In the above optional solutions, in addition to being helpful for efficiently and safely forming water vapor during subsequent heating, it can also timely detect and report an error when the current water level is always lower than the minimum normal water level. The reason may be an error in the relevant programs and / or hardware for water - level detection and water - supply control. By reporting the error in a timely manner, it is possible to avoid the impact of this error on the subsequent processing of steam ablation.

[0040] Optionally, when the controller controls the water pump according to the current water level, it is specifically used for:

[0041] If the steam ablation device is in the pre - heating state, then:

[0042] Control the water pump according to the current water level, and the specified maximum normal water level and minimum normal water level.

[0043] Optionally, according to the current water level, as well as the specified maximum normal water level and minimum normal water level, control the water pump, specifically including:

[0044] If the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, then control the water pump to be in the starting state;

[0045] If the current water level is higher than or equal to the maximum normal water level, then control the water pump to be in the closed state.

[0046] In the above optional solutions, it can help make the water pump control result match the water level requirement in the preheating state (the water level requirement reflected based on the maximum normal water level and the minimum normal water level). Furthermore, after starting heating, there is sufficient and continuous water volume in the steam generator to form water vapor, and the preheating process can be safely and stably realized under a controllable water level.

[0047] Optionally, according to the current water level, as well as the specified maximum normal water level and minimum normal water level, control the water pump, specifically including:

[0048] If the steam ablation device is in the standby state, then:

[0049] According to the current water level and the specified maximum normal water level, control the water pump.

[0050] Optionally, according to the current water level, as well as the specified maximum normal water level, control the water pump, specifically including:

[0051] If the current water level is lower than the maximum normal water level, then control the water pump to be in the starting state;

[0052] If the current water level is higher than or equal to the maximum normal water level, then control the water pump to be in the closed state.

[0053] In the above optional solutions, it can help make the water pump control result match the water level requirement in the standby state (the water level requirement reflected based on the maximum normal water level). Furthermore, during standby, there is sufficient and continuous water volume in the steam generator to form water vapor, and the standby process can be safely and stably realized under a controllable water level.

[0054] Optionally, when the controller controls the water pump according to the current water level, it is specifically used for:

[0055] If the steam ablation device is in the ablation preparation state, then:

[0056] According to the current water level, as well as the specified minimum normal water level and maximum normal water level, control the water pump, where the minimum normal water level is lower than the maximum normal water level.

[0057] Among the above optional solutions, it can help make the water pump control result match the water level demand in the ablation preparation state (the water level demand reflected based on the maximum normal water level and the minimum normal water level). Furthermore, after starting heating, there is sufficient and continuous water volume in the steam generator to form water vapor and maintain the required pressure and steam supply capacity.

[0058] Optionally, according to the current water level, as well as the specified minimum normal water level and maximum normal water level, control the water pump, specifically including:

[0059] If the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, control the water pump to be in the closed state and maintain the set water pump closing time, then start the water pump and maintain the set water pump starting time;

[0060] If the current water level is higher than or equal to the maximum normal water level, control the water pump to be in the closed state.

[0061] Among the above optional solutions, by first closing the water pump, then starting the water pump, and only maintaining the set water pump starting time, it accurately matches the actual demand in the ablation preparation state (without continuous water supply for a long time). At the same time, it simplifies the processing flow and improves the processing efficiency.

[0062] Optionally, the water level conversion circuit includes a first inverter, a second inverter, a third inverter, a fourth inverter, and a port expansion module.

[0063] The input end of the first inverter is electrically connected to the first water level feedback end of the first water level sensor, and the output end of the first inverter is electrically connected to the first input end on the first side of the port expansion module;

[0064] The input end of the second inverter is electrically connected to the second water level feedback end of the first water level sensor, and the output end of the second inverter is electrically connected to the second input end on the first side of the port expansion module;

[0065] The input end of the third inverter is electrically connected to the first water level feedback end of the second water level sensor, and the output end of the third inverter is electrically connected to the third input end on the first side of the port expansion module;

[0066] The input end of the fourth inverter is electrically connected to the second water level feedback end of the second water level sensor, and the output end of the fourth inverter is electrically connected to the fourth input end on the first side of the port expansion module;

[0067] The output end on the second side of the port expansion module is electrically connected to the controller.

[0068] In the above optional solutions, the water level detection signals detected at both ends of the first water level sensor and the second water level sensor are processed (such as amplified) by an inverter, and a standard voltage signal is fed back to the port expansion module. The port expansion module then feeds back the water level detection result to the controller. At the same time, based on the port expansion module, the positive effect of saving the controller ports can also be achieved.

[0069] Optionally, the water level conversion circuit further includes four filtering modules, and the filtering modules are electrically connected between the corresponding water level feedback terminals and the inverter.

[0070] In the above optional solutions, the filtering modules can filter the received water level detection signals to reduce the interference of other frequency signals, and at the same time can also prevent the mis-triggering of the sensors during the shaking of the device.

[0071] Optionally, the filtering module includes a filtering resistor and a filtering capacitor. The filtering resistor is electrically connected between the corresponding water level feedback terminal and the inverter, and the filtering capacitor is electrically connected between the corresponding inverter and the ground.

[0072] Optionally, the water level conversion circuit further includes a first pull-up resistor, a second pull-up resistor, a third pull-up resistor, and a fourth pull-up resistor;

[0073] One end of the first pull-up resistor is electrically connected to the first power supply, and the other end of the first pull-up resistor is electrically connected to the first water level feedback terminal of the first water level sensor;

[0074] One end of the second pull-up resistor is electrically connected to the first power supply, and the other end of the second pull-up resistor is electrically connected to the second water level feedback terminal of the first water level sensor;

[0075] One end of the third pull-up resistor is electrically connected to the first power supply, and the other end of the third pull-up resistor is electrically connected to the first water level feedback terminal of the second water level sensor;

[0076] One end of the fourth pull-up resistor is electrically connected to the first power supply, and the other end of the fourth pull-up resistor is electrically connected to the second water level feedback terminal of the second water level sensor.

[0077] Optionally, the steam ablation device further includes a water pump drive circuit. The controlled end of the water pump is electrically connected to the water pump drive circuit, and the water pump drive circuit is also electrically connected to the controller.

[0078] The water pump drive circuit is configured to respond to the water pump control signal sent by the controller and send a corresponding water pump drive signal to the water pump to drive the opening and closing of the water pump.

[0079] In the above optional solutions, a water pump driving circuit is used to control the water pump. The water pump driving circuit receives the water pump driving signal sent by the controller to achieve automatic control of the water pump, without relying on manual operation, with relatively high efficiency. Moreover, the control result has stability and will not change with the state, cognition, and experience of the operator.

[0080] Optionally, the water pump driving circuit includes a motor driving chip and a first field-effect transistor. The input end of the motor driving chip is electrically connected to the first pole of the first field-effect transistor. The second pole of the first field-effect transistor is grounded, and the gate of the first field-effect transistor is electrically connected to the controller.

[0081] The first output end of the motor driving chip is electrically connected to the controlled end of the water pump to drive the opening and closing of the water pump. The second output end of the motor driving chip is electrically connected to the controller to feedback the water pump driving signal to the controller.

[0082] Optionally, the water pump driving circuit further includes a voltage stabilizing diode and a first driving resistor. The voltage stabilizing diode is electrically connected between the gate and the second pole of the first field-effect transistor, and the first driving resistor is electrically connected between the gate and the second pole of the first field-effect transistor.

[0083] Optionally, the water pump driving circuit further includes a second driving resistor, a third driving resistor, a first diode, a second diode, and a driving capacitor. The second driving resistor is electrically connected between the second output end of the motor driving chip and the ground;

[0084] The third driving resistor is electrically connected between the second output end of the motor driving chip and the controller;

[0085] The positive electrode of the first diode is electrically connected to the ground, and the negative electrode of the first diode is electrically connected to the first output end of the motor driving chip;

[0086] The positive electrode of the second diode is electrically connected to the first output end of the motor driving chip, and the negative electrode of the second diode is electrically connected to the second power supply;

[0087] The driving capacitor is electrically connected between the second power supply and the ground. Description of the Drawings

[0088] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0089] Figure 1Schematic diagram of the structure of a steam ablation device in an embodiment of the present invention Figure 1 ;

[0090] Figure 2 Schematic diagram of the structure of a steam ablation device in an embodiment of the present invention Figure 2 ;

[0091] Figure 3 Flow schematic diagram of the control method of the controller of a steam ablation device in an embodiment of the present invention Figure 1 ;

[0092] Figure 4 Flow schematic diagram of the control method of the controller of a steam ablation device in an embodiment of the present invention Figure 2 ;

[0093] Figure 5 Flow schematic diagram of step S103 in an embodiment of the present invention;

[0094] Figure 6 Flow schematic diagram of steps S1033 and S1034 in an embodiment of the present invention;

[0095] Figure 7 Flow schematic diagram of the control method of the controller of a steam ablation device in an embodiment of the present invention Figure 3 ;

[0096] Figure 8 Flow schematic diagram of step S105 in an embodiment of the present invention;

[0097] Figure 9 Flow schematic diagram of the control method of the controller of a steam ablation device in an embodiment of the present invention Figure 4 ;

[0098] Figure 10 Flow schematic diagram of step S107 in an embodiment of the present invention;

[0099] Figure 11 Flow schematic diagram of the control method of the controller of a steam ablation device in an embodiment of the present invention Figure 5 ;

[0100] Figure 12 Flow schematic diagram of step S109 in an embodiment of the present invention;

[0101] Figure 13 Schematic diagram of the water level conversion circuit in an embodiment of the present invention Figure 1 ;

[0102] Figure 14 Schematic diagram of the water level conversion circuit in an embodiment of the present invention Figure 2 ;

[0103] Figure 15 Schematic structure of a steam ablation device in an embodiment of the present invention Figure 3 ;

[0104] Figure 16 Schematic diagram of a water pump drive circuit in an embodiment of the present invention;

[0105] Description of reference numerals:

[0106] 1 - Steam ablation device; 11 - Steam generator; 12 - Controller; 13 - Water pump; 14 - Water level detection device; 15 - Water level conversion circuit; 16 - Water pump drive circuit; 141 - First water level sensor; 142 - Second water level sensor; 151 - Port expansion module; 152 - Filter module;

[0107] U151 - First inverter; U152 - Second inverter; U153 - Third inverter; U154 - Fourth inverter; Rf - Filter resistor; Cf - Filter capacitor; R151 - First pull-up resistor; R152 - Second pull-up resistor; R153 - Third pull-up resistor; R154 - Fourth pull-up resistor; Vcc1 - First power supply; Vcc2 - Second power supply; Q1 - First field effect transistor; Dz - Zener diode; D161 - First diode; D162 - Second diode; R161 - First drive resistor; R162 - Second drive resistor; R163 - Third drive resistor; U16 - Motor drive chip; C16 - Drive capacitor; J15 - Connector; J16 - Connector. Detailed implementation manners

[0108] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0109] In the description of the specification of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper part", "lower part", "upper end", "lower end", "lower surface", "upper surface", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0110] In the description of the specification of the present invention, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0111] In the description of the present invention, the meaning of "a plurality" is a plurality, such as two, three, four, etc., unless otherwise specifically and clearly defined.

[0112] In the description of the specification of the present invention, unless otherwise clearly specified and defined, terms such as "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0113] The technical solution of the present invention will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and for the same or similar concepts or processes, they may not be repeated in some embodiments.

[0114] Please refer to Figure 1 , the steam ablation device 1 provided by the embodiment of the present invention includes a steam generator 11, a water level detection device 14, a water pump 13, a water level conversion circuit 15 and a controller 12. The water level detection device 14 communicates with the steam generator 11. The feedback end of the water level detection device 14 is electrically connected to the first end of the water level conversion circuit 15, and the second end of the water level conversion circuit 15 is electrically connected to the controller 12. The water pump 13 is connected between the water source 2 and the water inlet of the steam generator 11, and the water pump 13 is configured to be controlled by the controller 12;

[0115] The water level detection device 14 is used to detect the water level in the steam generator 11, obtain a water level detection signal representing the current water level of the steam generator 11, and feedback the current water level to the controller 12 through the water level conversion circuit 15;

[0116] The controller 12 is used to execute Figure 3 the step S10 shown: control the water pump according to the current water level.

[0117] The water source 2 therein can be any device or combination of devices capable of containing water. Figure 1In the illustrated example, it can be external to the steam ablation device 1 independently of the steam ablation device 1. In other examples, the water source 2 can also be loaded into the steam ablation device 1 and be part of the steam ablation device 1.

[0118] The steam generator 11 therein can be understood as any device or combination of devices capable of generating steam based on the supplied water. For example, it may include a steam generation container for containing water and water vapor.

[0119] The water pump 13 therein can be understood as any device or combination of devices capable of forming a liquid driving force between the water source 2 and the steam generator 11, so that the water from the water source 2 can enter the steam generator 11. The type of the water pump 13 can be arbitrarily changed according to requirements. In some examples, the controller 12 and the water pump 13 can be configured to only control the on and off of the water pump 13. In other examples, in addition to controlling the on and off of the water pump 13, the controller 12 and the water pump 13 can also be configured to further control the magnitude of the driving force of the water pump 13.

[0120] Other devices (such as valve parts, temperature detection devices, plasma water detection devices, etc.) can also be provided between the water pump 13 and the water source 2, and between the water pump 13 and the steam generator 11.

[0121] The controller 12 therein can be understood as any device with data processing capabilities and communication capabilities, and the programs and / or hardware therein can be arbitrarily configured based on the implemented control process.

[0122] The water pump 13 (water level detection device 14, water level conversion circuit 15, water pump drive circuit 16, etc.) can be communicatively connected to the controller 12 by wired or wireless means. The communicative connection therein includes the case of direct communicative connection and can also include the case of indirect communicative connection. As long as data interaction can be achieved with the controller 12, it does not deviate from the scope of the embodiments of the present invention.

[0123] In addition, Figure 1 In the illustrated example, the controller 12 is part of the steam ablation device 1. In other examples, the controller 12 can also be a device independent of the steam ablation device 1, such as a host computer capable of communicating with the steam ablation device 1.

[0124] Please refer to Figure 2 , in one implementation, the water level detection device 14 has a cavity therein, and a first water level sensor 141 and a second water level sensor 142 are provided in the cavity. The cavity communicates with the steam generator 11.

[0125] The first water level feedback terminal of the first water level sensor 141 is electrically connected to the first input terminal of the water level conversion circuit 15, and the second water level feedback terminal of the first water level sensor 141 is electrically connected to the second input terminal of the water level conversion circuit 15;

[0126] The first water level sensor 141 is configured to:

[0127] When the current water level reaches the first water level, feed back a first water level detection signal to the water level conversion circuit 15; when the current water level reaches the second water level, feed back a second water level detection signal to the water level conversion circuit 15;

[0128] The first water level feedback terminal of the second water level sensor 142 is electrically connected to the third input terminal of the water level conversion circuit 15, and the second water level feedback terminal of the second water level sensor 142 is electrically connected to the fourth input terminal of the water level conversion circuit 15;

[0129] When the current water level reaches the third water level, feed back a third water level detection signal to the water level conversion circuit 15; when the current water level reaches the fourth water level, feed back a fourth water level detection signal to the water level conversion circuit 15.

[0130] The water level detection device 14 can be any device capable of detecting the water level in the steam generator 11. The water level detection device 14 includes a cavity, which is connected to the steam generator 11, and the water level in the cavity can be kept matched (the same or proportional) with the water level in the steam generator 11. At the same time, the first water level sensor 141 and the second water level sensor 142 can adopt float switches. Taking a single float switch as an example, a single float switch can detect whether the water level reaches one or two corresponding water levels and feed back corresponding signals to the controller. At the same time, the water inlet end of the cavity can also be connected to the water source 2 through the water pump 13. For example, the water sent by the water pump 13 can enter the steam generator and the cavity respectively. In addition, the embodiments of the present invention do not exclude using other means of water level detection devices and water level sensors. No matter what means are used, they do not depart from the scope of the embodiments of the present invention.

[0131] Correspondingly, the detection of the current water level can be to detect whether the current water level is higher or lower than the corresponding specified water level (such as the dry-run prevention water level, the minimum normal water level, the maximum normal water level, the top filling water level, etc.), or it can be to detect the specific water level value.

[0132] In one embodiment, the first water level is the dry-run prevention water level, the second water level is the minimum normal water level, the third water level is the maximum normal water level, and the fourth water level is the top filling water level; the dry-run prevention water level is lower than the minimum normal water level, the minimum normal water level is lower than the maximum normal water level, and the maximum normal water level is lower than the top filling water level.

[0133] In the above embodiments:

[0134] The dry - run prevention water level can reflect the basic requirement of "dry - run prevention", provide a basis for judging whether the steam generator 11 meets the dry - run prevention requirement during heating, and furthermore, the control of the water pump 13 implemented based on this can help make the control result match and meet the dry - run prevention requirement during heating.

[0135] The minimum normal water level and the maximum normal water level can reflect the water usage requirements during normal steam ablation and its preparatory work. Furthermore, the water pump control implemented based on this can help make the control result match and meet the actual water usage requirements.

[0136] The top - filling water level can reflect the water - holding limit of the steam generator 11. Furthermore, the control of the water pump 13 implemented based on this can help ensure the safety of water supply.

[0137] Please refer to Figures 3 to 4 , in one embodiment, step S10 includes:

[0138] S101: Whether the steam ablation device is in a filling state;

[0139] If the steam ablation device is in a filling state, then execute:

[0140] S102: Control the water pump to start and turn off the water pump after the set water - pump stop time ends;

[0141] S103: Control the water pump to start again or remain closed according to the current water level, the specified dry - run prevention water level, the minimum normal water level, and the maximum normal water level.

[0142] Among them, the dry - run prevention water level is lower than the minimum normal water level, and the minimum normal water level is lower than the maximum normal water level.

[0143] In the above optional solutions, in the filling state, the process of first starting the water pump to add water and then controlling the water pump based on the specified water level can help effectively ensure that the water level can reach the requirements for subsequent pre - heating (for example, reach the minimum normal water level) when in the filling state.

[0144] At the same time, compared with the method of continuously filling water in the filling state and the scheme of not filling water anymore after filling once, the above optional solutions can help subdivide and take into account different situations after water filling, so that the control of the water pump can accurately match various real water - level situations.

[0145] Please refer to Figure 5 , in one embodiment, step S103 includes:

[0146] S1031: Whether the current water level is lower than the dry - run prevention water level;

[0147] S1032: Whether the current water level is lower than the minimum normal water level;

[0148] S1035: Whether the current water level is lower than the maximum normal water level.

[0149] If the current water level is higher than or equal to the dry - burning prevention water level and lower than the minimum normal water level, then execute:

[0150] S1033: Control the water pump to start again;

[0151] S1034: Control the water pump according to the accumulated water - pump start time and the current water level;

[0152] If the current water level is higher than the minimum normal water level and lower than the maximum normal water level, then execute: S1037: Control the water pump to start again;

[0153] If the current water level is higher than or equal to the maximum normal water level, then execute: S1036: Control the water pump to remain closed.

[0154] The judgments of step S1031, step S1032, step S1035, and the subsequent judgments regarding the water level can all be made simultaneously or sequentially based on the operating principle of the water - level detection device. There are two water - level sensors (such as float switches) in the water - level detection device. Furthermore, it can be achieved that: when the current water level reaches the dry - burning prevention water level, a first water - level detection signal is fed back to the control device; when the current water level reaches the minimum normal water level, a second water - level detection signal is fed back to the control device; when the current water level reaches the maximum normal water level, a third water - level detection signal is fed back to the control device; when the current water level reaches the maximum normal water level, a fourth water - level detection signal is fed back to the control device. By judging whether the first water - level detection signal, the second water - level detection signal, the third water - level detection signal, and the fourth water - level detection signal are received, the judgment of the water level can be achieved (such as the judgments of step S1031, step S1032, step S1035, and subsequent similar judgments).

[0155] In the above - mentioned optional solutions, through the comparison and judgment of the current water level with the dry - burning prevention water level, the minimum normal water level, and the maximum normal water level, the following is achieved:

[0156] In the case where the dry - burning prevention requirement has been met, by restarting the water pump when the water level is lower than the maximum normal water level, the steam generator can continue to be supplied with water, which is beneficial for ensuring that: after subsequent heating starts, there is sufficient and continuous water volume in the steam generator for forming water vapor. At the same time, by controlling the water pump to remain closed when the water level is higher than or equal to the maximum normal water level, it is possible to avoid or reduce the restriction and safety hazards brought by excessive water volume to the formation of water vapor.

[0157] It can be seen that the above optional solutions can help to efficiently and safely form water vapor during subsequent heating.

[0158] Further, please refer to Figure 6 , step S1034 may include:

[0159] S10341: Whether the accumulated pump start time reaches the set filling time threshold;

[0160] When step S10341 is yes, the following can be executed:

[0161] S10342: Whether the current water level is lower than the maximum normal water level.

[0162] When step S10341 is no, the following can be executed:

[0163] S10345: Whether the current water level is lower than the maximum normal water level;

[0164] S10346: Whether the current water level is lower than the minimum normal water level.

[0165] If the current water level is higher than or equal to the maximum normal water level, step S10344 can be implemented: controlling the pump to close; in addition, before step S10344, a preset certain time can also be delayed;

[0166] After the accumulated pump start time reaches the set filling time threshold, if the current water level is still lower than the minimum normal water level, step S10343 can be executed: reporting an error;

[0167] When the accumulated pump filling time does not reach the filling time threshold, if the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, step S10347 can be executed: controlling the pump to remain started.

[0168] In the above optional solutions, in addition to being able to help efficiently and safely form water vapor during subsequent heating, it can also detect and report an error in a timely manner when the current water level is always lower than the minimum normal water level. The reason may be an error in the relevant programs and / or hardware for water level detection and water supply control. Through timely error reporting, the subsequent processing of steam ablation can be prevented from being affected by this error.

[0169] Please refer to Figure 7 , which illustrates the processing procedure for the preheating state.

[0170] Step S10 may include:

[0171] S104: Whether the steam ablation device is in the preheating state;

[0172] If the steam ablation device is in the preheating state, then execute:

[0173] S105: Control the water pump according to the current water level, and the specified maximum normal water level and minimum normal water level.

[0174] Further, please refer to Figure 8 , step S105 may include:

[0175] S1051: Whether the current water level is lower than the maximum normal water level;

[0176] S1052: Whether the current water level is lower than the minimum normal water level;

[0177] If the current water level is higher than or equal to the lowest normal water level and lower than the maximum normal water level, then step S1053 can be executed: Control the water pump to be in the starting state;

[0178] If the current water level is higher than or equal to the maximum normal water level, then step S1054 can be executed: Control the water pump to be in the closed state.

[0179] In the above optional solutions, it can help to make the water pump control result match the water level requirement in the preheating state (the water level requirement reflected based on the maximum normal water level and the minimum normal water level). Furthermore, after starting heating, there is sufficient and continuous water volume in the steam generator for forming water vapor, and the preheating process can be safely and stably achieved under a controllable water level.

[0180] Further,

[0181] Before step S104, it may further include: When the steam ablation device is in the filling state and it is detected that the current water level of the steam generator meets the preheating requirement, it is determined that the steam generator enters the preheating state. Specifically, it can be: When it is detected that the current water level of the steam generator is higher than or equal to the minimum normal water level, it is determined that the steam generator enters the preheating state. In the above solutions, it is judged whether the water level requirement for preheating is met, thus providing a basis for the change of the operating state. At the same time, it can also ensure that there is a relatively sufficient water volume when starting heating later.

[0182] Please refer to Figure 9 , which illustrates the processing procedure for the standby state.

[0183] Step S10 may include:

[0184] S106: Whether the steam ablation device is in the standby state;

[0185] If the steam ablation device is in the standby state, then execute:

[0186] S107: Control the water pump according to the current water level and the specified maximum normal water level.

[0187] Further, in step S107, the water pump can also be specifically controlled according to the current water level, as well as the specified minimum normal water level and maximum normal water level.

[0188] Further, please refer to Figure 10 , step S107 may include:

[0189] S1071: Whether the current water level is lower than the maximum normal water level;

[0190] If the current water level is lower than the maximum normal water level, then execute step S1072: Control the water pump to be in the starting state;

[0191] If the current water level is higher than or equal to the maximum normal water level, then execute step S1073: Control the water pump to be in the closed state.

[0192] In the above optional solutions, it can help make the water pump control result match the water level requirement in the standby state (the water level requirement reflected based on the maximum normal water level). Furthermore, during standby, there is sufficient and continuous water volume in the steam generator to form water vapor, and the standby process can be safely and stably realized under a controllable water level.

[0193] Further, before step S106, it may also include:

[0194] When the steam ablation device is in the preheating state, if it is detected that the current water level and the current steam temperature of the steam generator both meet the standby requirements, then it is determined that the steam generator enters the standby state. Specifically, it can be: when it is detected that the current water level is higher than or equal to the maximum normal water level and the current steam temperature is higher than the set disinfection temperature threshold, it is determined that the steam generator enters the standby state. In the above optional solutions, it is judged whether the water level and steam requirements for standby are met, thus providing a basis for the change of the operating state. At the same time, it can also ensure that there is a relatively sufficient water volume (i.e., higher than the maximum normal water level) and disinfection temperature during subsequent standby. Based on this water volume, it can help ensure the water vapor with the required pressure and the supply capacity of water vapor during the subsequent process. Based on this disinfection temperature, it can help achieve disinfection during standby.

[0195] Please refer to Figure 11 , which shows that the processing procedure steps S10 for the ablation preparation state may include:

[0196] S108: Whether the steam ablation device enters the ablation preparation state;

[0197] If the steam ablation device enters the ablation preparation state, then execute:

[0198] S109: Control the water pump according to the current water level, and the specified minimum normal water level and maximum normal water level, where the minimum normal water level is lower than the maximum normal water level.

[0199] Among the above optional solutions, it can help make the water pump control result match the water level requirement in the ablation preparation state (the water level requirement reflected based on the maximum normal water level and minimum normal water level). Furthermore, after starting heating, there is sufficient and continuous water volume in the steam generator to form water vapor and maintain the required pressure and steam supply capacity.

[0200] Further, please refer to Figure 12 , step S109 may include:

[0201] S1091: Whether the current water level is lower than the maximum normal water level;

[0202] S1092: Whether the current water level is lower than the minimum normal water level;

[0203] If the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, then execute step S1093: Control the water pump to be in the closed state and maintain the set water pump closing time, and then start the water pump and maintain the set water pump starting time;

[0204] If the current water level is higher than or equal to the maximum normal water level, then execute step S1094: Control the water pump to be in the closed state.

[0205] Among the above optional solutions, by first closing the water pump, then starting the water pump, and only maintaining the set water pump starting time, it accurately matches the actual requirement in the ablation preparation state (without continuous water supply for a long time). At the same time, it simplifies the processing flow and improves the processing efficiency.

[0206] Further, before step S108, it also includes:

[0207] When the steam ablation device is in the standby state, when it is detected that the current water level of the steam generator meets the requirements of ablation preparation and the steam ablation device has completed the disinfection process, it is determined that the steam ablation device enters the ablation preparation state. Specifically, it can be: when it is detected that the current water level is higher than or equal to the maximum normal water level and the steam ablation device has completed the disinfection process, it is determined that the steam ablation device enters the ablation preparation state.

[0208] In the above optional solutions, it is judged whether the water level required for steam ablation and the disinfection situation are satisfied, thereby providing a basis for the change of the operating state. At the same time, it can also ensure that there is sufficient water volume (i.e., higher than the maximum normal water level) and safety during subsequent ablation.

[0209] In addition, when in each operating state, the implementation of the above-mentioned various processing procedures can be ensured by further defining the working state in the operating state.

[0210] All the processes of controlling according to the specified water levels such as the minimum normal water level, the maximum normal water level, and the dry-run prevention water level are not limited to the processing method of directly comparing the specified water level with the current water level, and do not exclude the processing methods of participating in calculations based on the difference, ratio, etc. between the current water level and the specified water level, nor do they exclude the processing method of calculating the average value of the current water level within a certain period of time for participation in calculations. Any change does not deviate from the scope of the embodiments of the present invention.

[0211] It should be noted that the steam ablation device can have multiple operating states, and the multiple operating states include at least one of a filling state, a preheating state, a standby state, and an ablation preparation state.

[0212] The filling state can refer to the state in which water can be filled into the steam generator but no preheating is performed; specifically, it can refer to the state in which water is filled into the steam generator but no preheating is performed after the steam ablation device performs a self-check (or after steam ablation is performed, or after any other state), and the water level in the steam generator reaches at least the minimum normal water level.

[0213] The preheating state can refer to the state of preheating the internal environment of the steam generator; specifically, it can refer to the state in which the internal environment of the steam generator is preheated after the filling state (or after steam ablation is performed, or after any other state), and the steam in the steam generator can exceed the temperature required for disinfection and the temperature required for steam ablation.

[0214] In addition, when in the filling state and the preheating state, the steam generating device can be controlled to be connected to the condensing device, or can also not be connected to the condensing device.

[0215] The standby state can refer to the state in which the steam generator meets the requirements for steam ablation. Specifically, it can refer to the state in which the steam ablation device is disinfected after the preheating state (or after steam ablation is performed, or after any other state), and the steam generator meets the requirements for steam ablation.

[0216] In addition, during at least part of the disinfection process, the steam generator can be controllably connected to the steam ablation handle to send steam (steam above the disinfection temperature threshold or in any other state) to the disinfection handle for disinfection. After the set disinfection time ends, the disinfection process can be considered completed. After disinfection, the steam generator can be controllably connected to the condensation device, and then continuously generate steam which is recycled.

[0217] The ablation preparation state can refer to a state in which the steam generator can always meet the requirements of steam ablation. Specifically, it can refer to the state in which the steam generator can always meet the requirements of steam ablation after the standby state (or after steam ablation is performed).

[0218] In addition, when the steam ablation device is in the ablation preparation state, the steam generator can be controllably connected to the condensation device, and then continuously generate steam which is recycled. In the case of continuously repeating this process, the steam required for steam ablation is maintained. When it is necessary to discharge through the steam ablation handle, the steam is discharged from the steam ablation handle, and at this time, the steam does not return to the condensation device.

[0219] The requirements for steam ablation can, for example, include: having completed the disinfection process and the current water level being higher than the maximum normal water level. It can also, for example, include: the time interval since the last steam ablation (which can be understood as ejecting steam) exceeding the time threshold, the current steam temperature being higher than a certain threshold, the current pressure being higher than a certain threshold, and so on.

[0220] When in the preheating state, standby loading state, or ablation preparation state, the control device can also control the heating device to heat the steam generator.

[0221] In the above solutions, through the specific definition and implementation of the states, it is ensured that the steam generator can gradually form and maintain the steam required for ablation based on the principle of steam formation, meeting the requirements of steam ablation, and providing a basis for automatically and gradually realizing the entire process. The switching between the filling state, preheating state, standby state, and ablation preparation state can be automatically triggered based on the processing in the corresponding states.

[0222] The multiple operating states can also include the power-on self-check state, shutdown state, and so on.

[0223] The power-on self-check state can refer to the state in which the software and hardware of the steam ablation device are self-checked after power-on. In some examples, after the power-on self-check is completed, the steam ablation device can automatically enter the filling state.

[0224] The shutdown state can refer to the state in which the steam ablation device discharges the water and / or steam inside and completes the shutdown of the device. In some examples, the shutdown state can be triggered manually or automatically.

[0225] Please refer to Figure 13, the water level conversion circuit 15 includes a first inverter U151, a second inverter U152, a third inverter U153, a fourth inverter U154, and a port expansion module 151.

[0226] The input terminal of the first inverter U151 is electrically connected to the first water level feedback terminal of the first water level sensor 141, and the output terminal of the first inverter U151 is electrically connected to the first input terminal on the first side of the port expansion module 151.

[0227] The input terminal of the second inverter U152 is electrically connected to the second water level feedback terminal of the first water level sensor 141, and the output terminal of the second inverter U152 is electrically connected to the second input terminal on the first side of the port expansion module 151.

[0228] The input terminal of the third inverter U153 is electrically connected to the first water level feedback terminal of the second water level sensor 142, and the output terminal of the third inverter U153 is electrically connected to the third input terminal on the first side of the port expansion module 151.

[0229] The input terminal of the fourth inverter U154 is electrically connected to the second water level feedback terminal of the second water level sensor 142, and the output terminal of the fourth inverter U154 is electrically connected to the fourth input terminal on the first side of the port expansion module 151.

[0230] The output terminal on the second side of the port expansion module 151 is electrically connected to the controller 12.

[0231] In the above embodiments, the water level detection signals detected at both ends of the first water level sensor 141 and the second water level sensor 142 are processed (such as amplified) by the inverter, and a standard voltage signal is fed back to the port expansion module 151. The port expansion module 151 feeds back the water level detection result to the controller 12. At the same time, based on the port expansion module, the positive effect of saving the controller ports can also be achieved.

[0232] Please refer to Figure 14 , the water level conversion circuit 15 further includes four filtering modules 152, and the filtering modules 152 are electrically connected between the corresponding water level feedback terminals and the inverters.

[0233] In the above embodiments, the filtering module can filter the received water level detection signals, reduce the interference of other frequency signals, and at the same time prevent the mis-triggering of the sensor during the shaking of the device.

[0234] In one embodiment, the filtering module includes a filtering resistor Rf and a filtering capacitor Cf. The filtering resistor Rf is electrically connected between the corresponding water level feedback terminal and the inverter, and the filtering capacitor Cf is electrically connected between the corresponding inverter and the ground.

[0235] The water level conversion circuit further includes a first pull-up resistor R151, a second pull-up resistor R152, a third pull-up resistor R153, and a fourth pull-up resistor R154;

[0236] One end of the first pull-up resistor R151 is electrically connected to the first power supply Vcc1, and the other end of the first pull-up resistor R151 is electrically connected to the first water level feedback terminal of the first water level sensor 141;

[0237] One end of the second pull-up resistor R152 is electrically connected to the first power supply Vcc1, and the other end of the second pull-up resistor R152 is electrically connected to the second water level feedback terminal of the first water level sensor 141;

[0238] One end of the third pull-up resistor R153 is electrically connected to the first power supply Vcc1, and the other end of the third pull-up resistor R153 is electrically connected to the first water level feedback terminal of the second water level sensor 142;

[0239] One end of the fourth pull-up resistor R154 is electrically connected to the first power supply Vcc1, and the other end of the fourth pull-up resistor R154 is electrically connected to the second water level feedback terminal of the second water level sensor 142.

[0240] Please refer to Figure 15 In one embodiment, the steam ablation device 1 further includes a water pump drive circuit 16. The controlled end of the water pump 13 is electrically connected to the water pump drive circuit 16, and the water pump drive circuit 16 is also electrically connected to the controller 12.

[0241] The water pump drive circuit 16 is configured to respond to the water pump control signal issued by the controller 12 and send a corresponding water pump drive signal to the water pump 13 to drive the opening and closing of the water pump 13.

[0242] In the above embodiment, the water pump 13 is controlled by the water pump drive circuit 16. The water pump drive circuit 16 receives the water pump drive signal issued by the controller 12 to achieve automatic control of the water pump 13, without relying on manual operation, with high efficiency. Moreover, the control result has stability and will not change with the state, cognition, and experience of the operator.

[0243] Please refer to Figure 16 The water pump drive circuit 16 includes a motor drive chip U16 and a first field effect transistor Q1. The input end of the motor drive chip U16 is electrically connected to the first pole of the first field effect transistor Q1. The second pole of the first field effect transistor Q1 is grounded, and the gate of the first field effect transistor Q1 is electrically connected to the controller 12.

[0244] The first output terminal of the motor drive chip U16 is electrically connected to the controlled terminal of the water pump 13 to drive the opening and closing of the water pump 13, and the second output terminal of the motor drive chip U16 is electrically connected to the controller 12 to feedback the water pump drive signal to the controller 12.

[0245] In an embodiment, the water pump drive circuit 16 further includes a voltage stabilizing diode Dz and a first drive resistor R161. The voltage stabilizing diode Dz is electrically connected between the gate and the second pole of the first field effect transistor Q1, and the first drive resistor R161 is electrically connected between the gate and the second pole of the first field effect transistor Q1.

[0246] In an embodiment, the water pump drive circuit 16 further includes a second drive resistor R162, a third drive resistor R163, a first diode D161, a second diode D162, and a drive capacitor C16. The second drive resistor R162 is electrically connected between the second output terminal of the motor drive chip U16 and the ground;

[0247] The third drive resistor R163 is electrically connected between the second output terminal of the motor drive chip U16 and the controller 12;

[0248] The positive electrode of the first diode D161 is electrically connected to the ground, and the negative electrode of the first diode D161 is electrically connected to the first output terminal of the motor drive chip U16;

[0249] The positive electrode of the second diode D162 is electrically connected to the first output terminal of the motor drive chip U16, and the negative electrode of the second diode D162 is electrically connected to the second power supply Vcc2;

[0250] The drive capacitor C16 is electrically connected between the second power supply Vcc2 and the ground.

[0251] Please refer to Figure 14 and Figure 16 , in an embodiment, the water level conversion circuit 15 further includes a connector J15. The feedback terminals of the first water level sensor 141 and the second water level sensor 142 can be connected to the input terminal of the inverter through the connector J15;

[0252] The water pump drive circuit 16 further includes a connector J16. The controlled terminal of the water pump 13 and the first input terminal of the motor drive chip can be connected through the connector J16.

[0253] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A steam ablation device, characterized in that, It includes a steam generator, a water level detection device, a water pump, a water level conversion circuit and a controller. The water level detection device is connected to the steam generator. The feedback end of the water level detection device is electrically connected to the first end of the water level conversion circuit. The second end of the water level conversion circuit is electrically connected to the controller. The water pump is connected between a water source and the water inlet of the steam generator, and the water pump is configured to be controlled by the controller; The water level detection device is used to detect the water level in the steam generator, obtain a water level detection signal representing the current water level of the steam generator, and feedback the current water level to the controller through the water level conversion circuit; The controller is used to control the water pump according to the current water level, including: If the steam ablation device is in a filling state, a preheating state or a standby state, then: If the current water level is higher than the minimum normal water level and lower than the maximum normal water level, control the water pump to be in a starting state; If the steam ablation device is in an ablation preparation state, then: If the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, control the water pump to be in a closed state and maintain a set water pump closing time, and then start the water pump and maintain a set water pump starting time; when the steam ablation device is in an ablation preparation state, the steam generator is controlled to be connected to the condensation device, and then steam is continuously generated and recycled.

2. The steam ablation device according to claim 1, wherein The water level detection device includes a cavity, and a first water level sensor and a second water level sensor arranged in the cavity. The cavity is connected to the steam generator, and the water level in the cavity matches the water level in the steam generator. The first water level feedback end of the first water level sensor is electrically connected to the first input end of the water level conversion circuit, and the second water level feedback end of the first water level sensor is electrically connected to the second input end of the water level conversion circuit; The first water level sensor is used to: When the current water level reaches the first water level, feedback a first water level detection signal to the water level conversion circuit; when the current water level reaches the second water level, feedback a second water level detection signal to the water level conversion circuit; The first water level feedback end of the second water level sensor is electrically connected to the third input end of the water level conversion circuit, and the second water level feedback end of the second water level sensor is electrically connected to the fourth input end of the water level conversion circuit; When the current water level reaches the third water level, feedback a third water level detection signal to the water level conversion circuit; when the current water level reaches the fourth water level, feedback a fourth water level detection signal to the water level conversion circuit.

3. The steam ablation device according to claim 2, wherein The first water level is the dry-run prevention water level, the second water level is the minimum normal water level, the third water level is the maximum normal water level, and the fourth water level is the top-fill water level; the dry-run prevention water level is lower than the minimum normal water level, the minimum normal water level is lower than the maximum normal water level, and the maximum normal water level is lower than the top-fill water level.

4. The steam ablation device according to claim 3, wherein, When the controller controls the water pump according to the current water level, it is specifically used for: If the steam ablation device is in a filling state, then: Control the start of the water pump and turn off the water pump after the set water pump stop time ends; According to the current water level, as well as the specified dry-run prevention water level, minimum normal water level, and maximum normal water level, control the water pump to start again or remain closed, where the dry-run prevention water level is lower than the minimum normal water level, and the minimum normal water level is lower than the maximum normal water level.

5. The steam ablation device according to claim 4, wherein, According to the current water level, as well as the specified dry-run prevention water level, minimum normal water level, and maximum normal water level, controlling the water pump to start again or remain closed includes: If the current water level is higher than the dry-run prevention water level and lower than the minimum normal water level, control the water pump to start again, and after restarting, control the water pump according to the accumulated water pump start time and the current water level; If the current water level is higher than or equal to the maximum normal water level, control the water pump to remain closed.

6. The steam ablation device according to claim 5, wherein, Controlling the water pump according to the accumulated water pump start time and the current water level includes: If the current water level is higher than or equal to the maximum normal water level, control the water pump to close; After the accumulated water pump start time reaches the set filling time threshold, if the current water level is still lower than the minimum normal water level, report an error; When the accumulated water pump filling time has not reached the filling time threshold, if the current water level is higher than or equal to the minimum normal water level and lower than the maximum normal water level, control the water pump to remain started.

7. The steam ablation device according to claim 3, wherein When the controller controls the water pump according to the current water level, it is specifically used for: If the steam ablation device is in the preheating state or standby state, then: When the current water level is higher than or equal to the maximum normal water level, control the water pump to be in the closed state.

8. The steam ablation device according to claim 3, wherein, When the controller controls the water pump according to the current water level, it is specifically used for: If the steam ablation device is in the ablation preparation state, then: If the current water level is higher than or equal to the maximum normal water level, control the water pump to be in the closed state.

9. The steam ablation device according to any one of claims 3 to 8, characterized in that, The water level conversion circuit includes a first inverter, a second inverter, a third inverter, a fourth inverter, and a port expansion module, The input end of the first inverter is electrically connected to the first water level feedback end of the first water level sensor, and the output end of the first inverter is electrically connected to the first input end on the first side of the port expansion module; The input end of the second inverter is electrically connected to the second water level feedback end of the first water level sensor, and the output end of the second inverter is electrically connected to the second input end on the first side of the port expansion module; The input end of the third inverter is electrically connected to the first water level feedback end of the second water level sensor, and the output end of the third inverter is electrically connected to the third input end on the first side of the port expansion module; The input end of the fourth inverter is electrically connected to the second water level feedback end of the second water level sensor, and the output end of the fourth inverter is electrically connected to the fourth input end on the first side of the port expansion module; The output end on the second side of the port expansion module is electrically connected to the controller.

10. The steam ablation device according to claim 9, wherein, The water level conversion circuit further includes four filtering modules, and the filtering modules are electrically connected between the corresponding water level feedback ends and the inverters.

11. The steam ablation device according to claim 10, wherein, The filtering module includes a filtering resistor and a filtering capacitor. The filtering resistor is electrically connected between the corresponding water level feedback terminal and the inverter, and the filtering capacitor is electrically connected between the corresponding inverter and the ground.

12. The steam ablation device according to claim 10, wherein, The water level conversion circuit further includes a first pull-up resistor, a second pull-up resistor, a third pull-up resistor, and a fourth pull-up resistor; One end of the first pull-up resistor is electrically connected to the first power supply, and the other end of the first pull-up resistor is electrically connected to the first water level feedback terminal of the first water level sensor; One end of the second pull-up resistor is electrically connected to the first power supply, and the other end of the second pull-up resistor is electrically connected to the second water level feedback terminal of the first water level sensor; One end of the third pull-up resistor is electrically connected to the first power supply, and the other end of the third pull-up resistor is electrically connected to the first water level feedback terminal of the second water level sensor; One end of the fourth pull-up resistor is electrically connected to the first power supply, and the other end of the fourth pull-up resistor is electrically connected to the second water level feedback terminal of the second water level sensor.

13. The steam ablation device according to any one of claims 1 to 8, characterized in that, It further includes a water pump drive circuit. The controlled end of the water pump is electrically connected to the water pump drive circuit, and the water pump drive circuit is also electrically connected to the controller. The water pump drive circuit is configured to respond to the water pump control signal issued by the controller and send a corresponding water pump drive signal to the water pump to drive the water pump to turn on and off.

14. The steam ablation device according to claim 13, wherein, The water pump drive circuit includes a motor drive chip and a first field-effect transistor. The input end of the motor drive chip is electrically connected to the first pole of the first field-effect transistor. The second pole of the first field-effect transistor is grounded, and the gate of the first field-effect transistor is electrically connected to the controller. The first output end of the motor drive chip is electrically connected to the controlled end of the water pump to drive the water pump to turn on and off. The second output end of the motor drive chip is electrically connected to the controller to feedback the water pump drive signal to the controller.

15. The steam ablation device according to claim 14, characterized in that, The water pump drive circuit further includes a zener diode and a first drive resistor. The zener diode is electrically connected between the gate and the second pole of the first field-effect transistor, and the first drive resistor is electrically connected between the gate and the second pole of the first field-effect transistor.

16. The steam ablation device according to claim 15, wherein, The water pump drive circuit further includes a second drive resistor, a third drive resistor, a first diode, a second diode, and a drive capacitor. The second drive resistor is electrically connected between the second output end of the motor drive chip and the ground; The third drive resistor is electrically connected between the second output end of the motor drive chip and the controller; The positive electrode of the first diode is electrically connected to the ground, and the negative electrode of the first diode is electrically connected to the first output end of the motor drive chip; The positive electrode of the second diode is electrically connected to the first output end of the motor drive chip, and the negative electrode of the second diode is electrically connected to the second power supply; The drive capacitor is electrically connected between the second power supply and the ground.

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