Microwave ablation system and method of controlling the same

Abstract

The application provides a microwave ablation system and a control method thereof. The microwave ablation system comprises a liquid injection mechanism, an acquisition unit and an adjustment control unit. The acquisition unit is used for acquiring a standing wave ratio parameter of the microwave ablation system in a microwave ablation process. A processing unit is electrically connected with the acquisition sensor and the adjustment control unit. When the standing wave ratio parameter acquired by the acquisition unit exceeds a first set threshold range, the processing unit sends a parameter adjustment control signal to the adjustment control unit. The adjustment control unit is electrically connected with the acquisition unit, the processing unit and the liquid injection mechanism. After receiving the parameter adjustment control signal, the adjustment control unit starts a closed-loop control program. According to the standing wave ratio parameter acquired by the acquisition unit, the adjustment control unit adjusts the flow of the fluid medium delivered by the liquid injection mechanism to the target tissue in the microwave ablation process, so that the standing wave ratio parameter falls within a second set threshold range. The first set threshold range is greater than the second set threshold range. The application can improve the safety in the microwave ablation process.

Description

Technical Field

[0001] This application relates to the field of microwave ablation technology, and more specifically, to a microwave ablation system and its control method. Background Technology

[0002] Cancer is an ancient and common disease that seriously threatens human health. Developing effective cancer treatments has always been a goal of the clinical medical community. With the rapid development of tumor hyperthermia technology, microwave ablation has been widely used due to its advantages of being minimally invasive, effective, simple, and relatively inexpensive. Microwave ablation has become a major treatment method in hyperthermia.

[0003] Ensuring the safety of microwave ablation is a critical issue. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a microwave ablation system and its control method to solve the technical problem of low safety during microwave ablation.

[0005] In a first aspect, embodiments of this application provide a microwave ablation system, comprising: Injection mechanism; The acquisition unit is used to acquire the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process. The processing unit is electrically connected to both the acquisition sensor and the adjustment control unit, and is used to send the parameter adjustment control signal to the adjustment control unit when the standing wave ratio parameter acquired by the acquisition unit exceeds the first set threshold range. The adjustment control unit is electrically connected to the acquisition unit, the processing unit, and the injection mechanism. After receiving the parameter adjustment control signal, it starts a closed-loop control program and adjusts the flow rate of the fluid medium delivered by the injection mechanism to the target tissue during microwave ablation according to the standing wave ratio parameter acquired by the acquisition unit, so that the standing wave ratio parameter falls within a second set threshold range; the first set threshold range is greater than the second set threshold range.

[0006] In one possible implementation, the microwave ablation system also includes: A microwave source generator, electrically connected to the processing unit, is used to output microwave energy to the target tissue at a constant power according to the ablation signal sent by the processing unit.

[0007] In one possible implementation, the microwave ablation system also includes: The ablation needle includes a conductive structure electrically connected to the microwave source generator and a water injection structure connected to the liquid injection mechanism via a pipeline. The conductive structure is used to output microwave energy to the target tissue, and the water injection structure is used to inject the fluid medium delivered by the liquid injection mechanism into the target tissue.

[0008] In one possible implementation, the microwave ablation system also includes: An input unit, electrically connected to the processing unit, is used to input a first set threshold range of the VSWR parameter and transmit the first set threshold range to the processing unit.

[0009] In one possible implementation, the injection mechanism includes at least one of a peristaltic pump or a perfusion pump; The regulating control unit is electrically connected to the control terminal of at least one of the peristaltic pump or the injection pump, and is used to regulate the rotational speed of at least one of the peristaltic pump or the injection pump to adjust the flow rate of the fluid medium.

[0010] Secondly, embodiments of this application provide a control method for a microwave ablation system, applied to the microwave ablation system as described above, comprising: The acquisition unit collects the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process; The processing unit determines whether the standing wave ratio parameter exceeds a first preset threshold range; When the standing wave ratio parameter exceeds the first set threshold range, the control unit starts the closed-loop control program and adjusts the flow rate of the fluid medium delivered to the target tissue by the injection mechanism during microwave ablation according to the standing wave ratio parameter, so that the standing wave ratio parameter falls within the second set threshold range; the first set threshold range is greater than the second set threshold range.

[0011] In one possible implementation, adjusting the flow rate of the fluid medium delivered to the target tissue based on the standing wave ratio (SWR) parameter, such that the SWR parameter falls within a second preset threshold range; the first preset threshold range being greater than the second preset threshold range includes: When the standing wave ratio (SWR) parameter exceeds the first set threshold range, the control unit starts a closed-loop control program to determine whether the SWR parameter is greater than the set threshold; the set threshold is within the second set threshold range. When the standing wave ratio parameter is greater than the set threshold, the flow rate of the fluid medium delivered by the injection mechanism to the target tissue is increased; When the standing wave ratio parameter is less than or equal to the set threshold, the flow rate of the fluid medium delivered by the injection mechanism to the target tissue is reduced.

[0012] In one possible implementation, before the acquisition unit acquires the standing wave ratio (SWR) parameter of the microwave ablation system during the microwave ablation process, it further includes: The microwave source generator outputs microwave energy to the target tissue at a constant power.

[0013] In one possible implementation, the lower limit of the first set threshold range is 1.0 to 1.3, and the upper limit of the first set threshold range is 1.35 to 1.65.

[0014] In one possible implementation, when the standing wave ratio (SWR) parameter exceeds a first preset threshold range, the adjustment control unit adjusts the flow rate of the fluid medium delivered to the target tissue according to the SWR parameter, so that the SWR parameter falls within a second preset threshold range; after the first preset threshold range is greater than the second preset threshold range, the system further includes: The processing unit triggers an alarm when the flow rate of the fluid medium delivered to the target tissue exceeds a preset flow rate, wherein the preset flow rate ranges from 2 to 10 milliliters per minute.

[0015] The beneficial technical effects of the technical solutions provided in this application include: The system utilizes an acquisition unit to collect the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process, enabling safety monitoring. When the SWR parameters collected by the acquisition unit exceed a first set threshold range, the processing unit sends a parameter adjustment control signal to the adjustment control unit, triggering closed-loop adjustment of the SWR. The closed-loop control algorithm embedded in the adjustment control unit adjusts the flow rate of the fluid medium delivered to the target tissue by the injection mechanism, achieving closed-loop adjustment of the SWR. This ensures that the SWR parameters fluctuate around a set threshold (i.e., the SWR parameters fall within a second set threshold range). This maintains a relatively stable SWR parameter while ensuring that the microwave ablation output power does not decrease, allowing for continuous target tissue ablation, shortening the ablation time, and avoiding excessively high reflected power due to excessively high SWR parameters. This ensures a very low probability of needle breakage or needle failure and extends the lifespan of the microwave source generator. Furthermore, the continuous low impedance state at the target tissue and the continuous fluid medium injection maintain a low temperature in the target tissue, ensuring that the target tissue does not carbonize or has a very low degree of carbonization.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A schematic diagram of the framework of a microwave ablation system provided in this application embodiment; Figure 2 A schematic flowchart illustrating a control method for a microwave ablation system provided in an embodiment of this application; Figure 3 A flowchart illustrating another control method for a microwave ablation system provided in an embodiment of this application; Figure 4 This is a graph showing the VSWR as a function of load in related technologies. Figure 5 A graph showing the relationship between the standing wave ratio (SWR) and the load after a microwave ablation system provided in this application is in operation. Explanation of reference numerals in the attached figures: 10-Target tissue; 11-Injection mechanism; 12-Acquisition unit; 13-Processing unit; 14-Adjustment and control unit; 15-Microwave source generator; 16-Ablation needle; 17-Input unit.

[0018] It should be noted that the dashed and solid lines used for connecting components in the accompanying drawings of this invention represent liquid circuits and electrical circuits, respectively. Detailed Implementation

[0019] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0020] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in this application's specification means the presence of the stated steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by this art. It should be understood that when we say an element is "connected" or "coupled" to another element, the element may be directly connected or coupled to the other element, or it may mean that the element and the other element are connected through an intermediate element. Furthermore, "connected" or "coupled" as used herein may include wireless connection or wireless coupling. The term "and / or" as used herein means at least one of the items defined by the term; for example, "A and / or B" may be implemented as "A," or as "B," or as "A and B."

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0022] Cancer is an ancient and common disease that seriously threatens human health. Developing effective cancer treatments has always been a goal of the clinical medical community. With the rapid development of tumor hyperthermia technology, microwave ablation has been widely used due to its advantages of being minimally invasive, effective, simple, and relatively inexpensive. Microwave ablation has become a major treatment method in hyperthermia.

[0023] During microwave ablation, the microwave reflection properties of the target tissue can change, potentially leading to a sudden increase in reflected power. In related technologies, a magnetron is typically used as the microwave source. This sudden increase in reflected power can cause mode hopping in the magnetron, affecting its normal operation. In some cases, the reflected power can even heat the magnetron, burning out the cathode filament and rendering the magnetron unusable. Furthermore, excessively high reflected power can also increase the risk of needle breakage during microwave ablation.

[0024] In related technologies, to protect the microwave generator and microwave ablation needle and improve safety, a technique is typically used that monitors the microwave reflection power and adjusts the emission power of the microwave source based on the microwave reflection power. However, due to the complexity of the microwave reflection characteristics of the target tissue, if the monitoring threshold is set too high, there may still be a risk of damage to the microwave generator and microwave ablation needle; if the monitoring threshold is set too low, it may affect the ablation effect on the target tissue.

[0025] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0026] This application provides a microwave ablation system, see [link to relevant documentation]. Figure 1 It includes an injection mechanism 11, a collection unit 12, a processing unit 13, and an adjustment and control unit 14.

[0027] The injection mechanism 11 is used to control the flow rate of the fluid medium delivered to the target tissue 10 during microwave ablation.

[0028] The acquisition unit 12 is used to acquire the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process.

[0029] The processing unit 13 is electrically connected to both the acquisition sensor and the adjustment control unit 14. When the standing wave ratio parameter acquired by the acquisition unit 12 exceeds the first set threshold range, it sends a parameter adjustment control signal to the adjustment control unit 14.

[0030] The adjustment control unit 14 is electrically connected to the acquisition unit 12, the processing unit 13, and the injection mechanism 11. After receiving the parameter adjustment control signal, it starts the closed-loop control program and adjusts the flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10 during the microwave ablation process according to the standing wave ratio parameter acquired by the acquisition unit 12, so that the standing wave ratio parameter falls within the second set threshold range; the first set threshold range is greater than the second set threshold range.

[0031] Standing Wave Ratio (SWR) is an important metric for measuring the impedance matching between power transmission and the load in radio frequency transmission systems (such as microwave ablation systems), and it has a significant impact on power transmission performance. Specifically, it describes the ratio of the maximum to the minimum value of a voltage or current waveform propagating along a transmission line. Ideally, when the transmission line is perfectly matched to its load (i.e., there are no reflected waves), the SWR is 1:1, representing the optimal matching state. However, in practical applications, imperfect matching due to various factors can generate reflected waves, thus forming standing waves and resulting in an SWR greater than 1.

[0032] The closer the SWR is to 1, the better the impedance matching between the transmission line and the load, the smaller the reflected power, and the higher the microwave energy transmission efficiency. A high SWR means more power reflection and power loss, and higher reflected power may lead to damage to the microwave generator and microwave ablation needle 16.

[0033] In this embodiment, target organization 10 is the load.

[0034] In this embodiment, the parameter adjustment control signal is used to start the closed-loop control program embedded in the adjustment control unit 14. After the closed-loop control program is started, the adjustment control unit 14 adjusts the flow rate of the fluid medium delivered to the target tissue 10 by the injection mechanism 11 during the microwave ablation process based on the real-time standing wave ratio parameter collected by the acquisition unit 12 and the embedded closed-loop control algorithm.

[0035] The acquisition unit 12 collects the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process, enabling safety monitoring. When the SWR parameters collected by the acquisition unit 12 exceed the first set threshold range, the processing unit 13 sends a parameter adjustment control signal to the adjustment control unit 14 to trigger the adjustment control unit 14 to perform closed-loop adjustment of the SWR. The closed-loop control algorithm embedded in the adjustment control unit 14 adjusts the flow rate of the fluid medium delivered to the target tissue by the injection mechanism 11, achieving closed-loop adjustment of the SWR. This causes the SWR parameters to fluctuate around the set threshold (i.e., the SWR parameters fall within the second set threshold range). This ensures that the microwave ablation output power is not reduced, while maintaining a relatively stable SWR parameter, allowing for continuous ablation of the target tissue, shortening the ablation time, and avoiding excessive reflection power due to excessively high SWR parameters. This ensures that the ablation needle 16 is not broken or has a very low probability of breakage, and also improves the service life of the microwave source generator 15.

[0036] Furthermore, due to the continuous low impedance state at the target tissue 10 and the continuous injection of fluid medium, the temperature of the target tissue 10 can be kept low (e.g., not exceeding 100°C), thereby ensuring that the target tissue 10 does not carbonize or has a very low degree of carbonization.

[0037] The fluid medium can be distilled water, physiological saline, etc.

[0038] It should be noted that "the first set threshold range is greater than the second set threshold range" means that the lower limit of the second set threshold range is greater than the lower limit of the first set threshold range, and the upper limit of the second set threshold range is less than the upper limit of the first set threshold range.

[0039] In some embodiments, the lower limit of the first set threshold range is 1.0 to 1.3. For example, 1.0, 1.15, 1.2, 1.3. The upper limit of the first set threshold range is 1.35 to 1.65. For example, 1.35, 1.45, 1.5, 1.55, 1.65.

[0040] In this embodiment, the first set threshold range can be greater than or equal to 1.15 and less than or equal to 1.5. The second set threshold range can be around 1.2.

[0041] In other words, when the VSWR parameter exceeds 1.15 to 1.5, the adjustment control unit is activated for closed-loop adjustment. The set threshold (ideal VSWR parameter) in the closed-loop adjustment program is set to 1.2, so that the VSWR parameter after closed-loop adjustment fluctuates around 1.2 (i.e., falls within the second set threshold range). When the VSWR parameter does not exceed 1.15 to 1.5, the adjustment control unit is not activated. This setting keeps the VSWR parameter of the microwave ablation system between 1.15 and 1.5.

[0042] In some embodiments, the adjustment control unit 14 initiates a closed-loop control program to determine whether the standing wave ratio parameter is greater than a set threshold; the set threshold is within a second set threshold range.

[0043] In practice, the threshold value can be set to the ideal VSWR parameter value. When the VSWR parameter after closed-loop adjustment fluctuates around the set threshold value, it means that the VSWR parameter falls within the range of the second set threshold value.

[0044] When the standing wave ratio parameter is greater than the set threshold, the flow rate of the fluid medium delivered by the injection mechanism to the target tissue is increased; when the standing wave ratio parameter is less than or equal to the set threshold, the flow rate of the fluid medium delivered by the injection mechanism to the target tissue is decreased.

[0045] In other words, when the control unit 14 executes the closed-loop control program, it receives the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process from the acquisition unit 12 in real time or at preset intervals. It compares the updated SWR parameters with a set threshold (generally set to an ideal SWR parameter, which falls within the range of a first set threshold). When the updated SWR parameter is greater than the set threshold, the flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10 is increased; when the updated SWR parameter is less than the set threshold, the flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10 is decreased. By adjusting the flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10, the SWR parameters of the microwave ablation system during the microwave ablation process are adjusted, causing the adjusted SWR parameters to fluctuate around the set threshold (i.e., fall within the range of a second set threshold), thus completing the closed-loop control of the SWR parameters.

[0046] See Figure 1 In some embodiments, the microwave ablation system may further include an input unit 17, which is electrically connected to the processing unit 13. The input unit 17 is used to input a first set threshold range of the standing wave ratio parameter and transmit the first set threshold range to the processing unit 13.

[0047] In other words, the processing unit 13 receives the first set threshold range of the standing wave ratio parameter input by the input unit 17 (such as a touch screen) and completes the parameter setting.

[0048] In other feasible embodiments, the microwave ablation system may also include a wireless communication module, and the processing unit 13 may also receive remote commands via the wireless communication module to complete parameter setting. That is, the processing unit 13 may also receive a first set threshold range of VSWR parameters transmitted by an external device via the wireless communication module.

[0049] The first set threshold range can be set according to the patient's age, gender, and physical indicators.

[0050] See Figure 1 In some embodiments, the microwave ablation system may further include: a microwave source generator 15, electrically connected to the processing unit 13, for outputting microwave energy to the target tissue 10 at a constant power according to the ablation signal sent by the processing unit 13.

[0051] Since the microwave source generator 15 outputs microwave energy to the target tissue 10 at a constant power, it can ensure that the target tissue 10 is continuously injected with ideal and expected microwave energy, thereby ensuring that the target tissue 10 is completely ablated and saving surgical time.

[0052] In some embodiments, the processing unit 13 is further configured to send an ablation signal to the microwave source generator 15 after receiving a power-on signal. The microwave source generator 15 continuously outputs microwave energy to the target tissue 10 at a constant power according to the ablation signal.

[0053] In some embodiments, the adjustment control unit 14 can be used to: receive the standing wave ratio (SWR) parameters collected by the acquisition unit 12, execute PID (Proportional-Integral-Derivative), fuzzy control, or other algorithms, calculate the deviation between the current SWR and the pre-set SWR, output the corrected flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10, and convert the flow rate into a speed control signal for the drive motor of the injection mechanism 11. Optionally, the adjustment control unit 14 can also be used to report real-time data (such as current flow rate and motor speed) to the processing unit 13 for display or recording.

[0054] In this embodiment, the processing unit 13 (central processing unit, CPU) does not directly participate in real-time PID control, but is responsible for global management, task scheduling, and complex calculations. The adjustment and control unit 14 focuses on real-time closed-loop control, directly connecting to the acquisition unit 12 and the liquid injection mechanism 11 to ensure the accuracy and stability of the system's dynamic response; utilizing local closed-loop feedback, it can independently complete millisecond-level adjustments without waiting for CPU intervention. By adopting a hierarchical architecture (distributed architecture), both the system's flexibility (the CPU can flexibly adjust the strategy) and the real-time performance and reliability of the control are ensured (the adjustment and control unit 14 focuses on execution).

[0055] In some embodiments, the acquisition unit 12 can be a standing wave ratio (SWR) sensor, also known as a standing wave ratio meter (SWR meter). An SWR meter is an instrument specifically designed to measure the voltage standing wave ratio on a transmission line. It is typically installed in the radio frequency signal path and can directly read the SWR value.

[0056] The general steps for measuring the SWR value with an SWR meter are as follows: Connect the microwave source generator 15 to one end of the SWR meter and connect the other end to the load (i.e., the target tissue 10); turn on the microwave source generator 15; observe the reading on the SWR meter to obtain the standing wave ratio under the current conditions.

[0057] See Figure 1 In some embodiments, the microwave ablation system may further include: an ablation needle 16, including a conductive structure electrically connected to the microwave source generator 15, and a water injection structure connected to the liquid injection mechanism 11 via a pipeline. The conductive structure is used to output microwave energy to the target tissue 10, and the water injection structure is used to inject the fluid medium delivered by the liquid injection mechanism 11 into the target tissue 10.

[0058] Figure 1 The dashed and solid lines used to connect components represent the liquid circuit and the electrical circuit, respectively. Figure 1 The injection mechanism 11 is connected to the ablation needle 16 via a liquid circuit, and the outlet of the injection mechanism 11 is connected to the inlet of the water injection structure of the ablation needle 16.

[0059] The ablation needle 16 can both deliver microwave energy to the target tissue 10 and inject the fluid medium delivered by the injection mechanism 11 into the target tissue 10, thus eliminating the need to insert two structures into the target tissue 10. This simplifies the operation, reduces patient damage, and improves the safety of microwave ablation.

[0060] In some embodiments, the injection mechanism 11 may include at least one of a peristaltic pump or a perfusion pump; the adjustment control unit 14 is electrically connected to the control terminal of at least one of the peristaltic pump or the perfusion pump and is used to adjust the rotational speed of at least one of the peristaltic pump or the perfusion pump to adjust the flow rate of the fluid medium.

[0061] In some embodiments, the drive circuit in the control unit 14 is electrically connected to the motor of at least one of the peristaltic pump or the injection pump, and the flow rate of the fluid medium is adjusted by adjusting the rotational speed of the drive motor of at least one of the peristaltic pump or the injection pump.

[0062] The peristaltic pump includes a drive motor and an elastic hose. The drive motor periodically squeezes the elastic hose to achieve unidirectional fluid flow, thereby delivering the fluid medium. The drive motor can include a stepper motor (high precision), a brushless DC motor (wide speed range), or a servo motor (closed-loop control). The infusion pump can include a stepper motor and a lead screw drive, converting the rotational motion of the stepper motor into precise linear propulsion, pushing the syringe piston to deliver the fluid medium.

[0063] The beneficial technical effects of the technical solutions provided in this application include: The acquisition unit 12 collects the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process, enabling safety monitoring. When the SWR parameters collected by the acquisition unit 12 exceed the first set threshold range, the processing unit 13 sends a parameter adjustment control signal to the adjustment control unit 14 to trigger the adjustment control unit 14 to perform closed-loop adjustment of the SWR. The closed-loop control algorithm embedded in the adjustment control unit 14 adjusts the flow rate of the fluid medium delivered to the target tissue by the injection mechanism 11, achieving closed-loop adjustment of the SWR. This causes the SWR parameters to fluctuate around the set threshold (i.e., the SWR parameters fall within the second set threshold range). This ensures that the microwave ablation output power is not reduced, while maintaining a relatively stable SWR parameter, allowing for continuous ablation of the target tissue, shortening the ablation time, and avoiding excessive reflection power due to excessively high SWR parameters. This ensures that the ablation needle 16 is not broken or has a very low probability of breakage, and also improves the service life of the microwave source generator 15.

[0064] Furthermore, due to the continuous low impedance state at the target tissue 10 and the continuous injection of fluid medium, the temperature of the target tissue 10 can be kept low, thereby ensuring that the target tissue 10 does not carbonize or has a very low degree of carbonization.

[0065] Based on the same inventive concept, this application provides a control method for a microwave ablation system, applied to the microwave ablation system described above. (See also...) Figure 2 The control method of the microwave ablation system includes steps S11 to S13.

[0066] S11: Acquisition unit 12 acquires the standing wave ratio parameters of the microwave ablation system during the microwave ablation process.

[0067] S12: Processing unit 13 determines whether the standing wave ratio parameter exceeds the first set threshold range.

[0068] S13: When the standing wave ratio parameter exceeds the first set threshold range, the adjustment control unit 14 starts the closed-loop control program and adjusts the flow rate of the fluid medium delivered to the target tissue 10 according to the standing wave ratio parameter, so that the standing wave ratio parameter falls into the second set threshold range; the first set threshold range is greater than the second set threshold range.

[0069] The acquisition unit 12 collects the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process, enabling safety monitoring. When the SWR parameters collected by the acquisition unit 12 exceed the first set threshold range, the processing unit 13 sends a parameter adjustment control signal to the adjustment control unit 14 to trigger the adjustment control unit 14 to perform closed-loop adjustment of the SWR. The closed-loop control algorithm embedded in the adjustment control unit 14 adjusts the flow rate of the fluid medium delivered to the target tissue by the injection mechanism 11, achieving closed-loop adjustment of the SWR. This causes the SWR parameters to fluctuate around the set threshold (i.e., the SWR parameters fall within the second set threshold range). This ensures that the microwave ablation output power is not reduced, while maintaining a relatively stable SWR parameter, allowing for continuous ablation of the target tissue, shortening the ablation time, and avoiding excessive reflection power due to excessively high SWR parameters. This ensures that the ablation needle 16 is not broken or has a very low probability of breakage, and also improves the service life of the microwave source generator 15.

[0070] Furthermore, due to the continuous low impedance state at the target tissue 10 and the continuous injection of fluid medium, the temperature of the target tissue 10 can be kept low, thereby ensuring that the target tissue 10 does not carbonize or has a very low degree of carbonization.

[0071] In some embodiments, the acquisition unit 12 can acquire the standing wave ratio (SWR) parameter of the microwave ablation system in real time during the microwave ablation process. Correspondingly, the adjustment control unit 14 adjusts the flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10 during the microwave ablation process based on the real-time SWR parameter.

[0072] In other feasible embodiments, the acquisition unit 12 can acquire the standing wave ratio (SWR) parameter of the microwave ablation system during the microwave ablation process every second preset time interval. Correspondingly, the adjustment control unit 14 can adjust the flow rate of the fluid medium delivered by the injection mechanism 11 to the target tissue 10 during the microwave ablation process according to the current SWR parameter every second preset time interval.

[0073] In some embodiments, the lower limit of the first set threshold range is 1.0 to 1.3. For example, 1.0, 1.15, 1.2, 1.3.

[0074] The upper limit of the first set threshold range is 1.35 to 1.65. For example, 1.35, 1.45, 1.5, 1.55, 1.65.

[0075] For example, the first set threshold range can be greater than or equal to 1.15 and less than or equal to 1.5. This setting ensures that the standing wave ratio of the microwave ablation system is always kept within an ideal and safe range.

[0076] In some embodiments, step S13 may include: adjusting the control unit to start a closed-loop control program when the standing wave ratio parameter exceeds a first set threshold range, determining whether the standing wave ratio parameter is greater than a set threshold; the set threshold is within a second set threshold range; when the standing wave ratio parameter is greater than the set threshold, increasing the flow rate of the fluid medium delivered by the injection mechanism to the target tissue; when the standing wave ratio parameter is less than or equal to the set threshold, decreasing the flow rate of the fluid medium delivered by the injection mechanism to the target tissue.

[0077] In some embodiments, the control unit may embed a closed-loop control algorithm, which may be a proportional control, PID (Proportional-Integral-Derivative) control, fuzzy control, or other similar algorithm. The closed-loop control program includes a computer-executable sequence of instructions based on this closed-loop control algorithm.

[0078] In this embodiment, the closed-loop control algorithm can be proportional control. Specifically, the flow rate of the fluid medium delivered to the target tissue 10 can be proportional to the difference between the standing wave ratio parameter and a preset threshold. That is, y = k(xa), where y represents the flow rate of the fluid medium delivered to the target tissue 10, x represents the standing wave ratio parameter of the microwave ablation system acquired by the acquisition unit 12 during the microwave ablation process, a represents the preset threshold, and k is a constant and a positive number. The preset threshold can be 1.15, 1.2, etc.

[0079] In some embodiments, step S11 may further include: microwave source generator 15 outputting microwave energy to target tissue 10 at a constant power.

[0080] Specifically, the microwave source generator 15 can output microwave energy to the target tissue 10 at a constant power according to the ablation signal sent by the processing unit 13. In some embodiments, after receiving a power-on signal, the processing unit 13 sends an ablation signal to the microwave source generator 15. The microwave source generator 15 continuously outputs microwave energy to the target tissue 10 at a constant power according to the ablation signal.

[0081] By adjusting the control unit 14 for closed-loop control, the microwave source generator 15 outputs microwave energy to the target tissue 10 at a constant power. This not only ensures that the ablation needle 16 is not broken or has a very low probability of breaking, thus improving the service life of the microwave source generator 15, and ensuring that the target tissue 10 is not carbonized or has a very low degree of carbonization, but also ensures that ideal and expected microwave energy is continuously injected into the target tissue 10, thereby ensuring that the target tissue 10 is completely ablated and saving surgical time.

[0082] In some embodiments, before the microwave source generator 15 outputs microwave energy to the target tissue 10 at a constant power, it may further include: the input unit 17 inputting a first set threshold range of the standing wave ratio parameter.

[0083] As an example, this application provides another control method for a microwave ablation system, see [link to relevant documentation]. Figure 3 The control method of the microwave ablation system includes steps S11 to S13.

[0084] S21: Input unit 17 inputs the first set threshold range of the VSWR parameter.

[0085] S22: Microwave source generator 15 outputs microwave energy to target tissue 10 at a constant power.

[0086] S23: Acquisition unit 12 acquires the standing wave ratio parameters of the microwave ablation system during the microwave ablation process.

[0087] S24: Processing unit 13 determines whether the standing wave ratio parameter exceeds the first set threshold range. If yes, it executes step S25; otherwise, it returns to step S23.

[0088] S25: The adjustment control unit 14 starts the closed-loop control program and adjusts the flow rate of the fluid medium delivered to the target tissue 10 according to the standing wave ratio parameter, so that the standing wave ratio parameter falls within the second set threshold range; the first set threshold range is greater than the second set threshold range.

[0089] In some embodiments, after step S25, the process may further include: when the flow rate of the fluid medium delivered to the target tissue 10 exceeds a preset flow rate, the processing unit 13 triggers an early warning, wherein the preset flow rate range (i.e., the value range) is 2 to 10 ml per minute.

[0090] In other words, the preset flow rate is greater than or equal to 2 ml per minute, and the preset flow rate is less than or equal to 10 ml per minute. For example, the preset flow rates are 2 ml per minute, 4 ml per minute, 6 ml per minute, 8 ml per minute, and 10 ml per minute.

[0091] This setting avoids the problem of excessive flow causing significant side effects to patients. For example, it prevents normal cells from being unable to absorb the water, thus avoiding local tissue edema and inflammation.

[0092] In some embodiments, the processing unit 13 may send a warning message to the display screen when the flow rate of the fluid medium delivered to the target tissue 10 exceeds a preset flow rate. The display screen displays the warning message, which may be warning text, warning image, or warning video.

[0093] In other feasible embodiments, the processing unit 13 may send a warning message to the alarm when the flow rate of the fluid medium delivered to the target tissue 10 exceeds a preset flow rate, and the alarm will sound an alarm after receiving the alarm message.

[0094] The control method of a microwave ablation system is illustrated below with an example. The control method of this microwave ablation system includes the following steps: S0, Microwave ablation system begins. For example, system power-on. S1. Set a first threshold range for the standing wave ratio (SWR) parameter in the microwave ablation system (e.g., the threshold range can be 1.15 to 1.5). For example, the user inputs the threshold range for the SWR parameter via a touchscreen.

[0095] S2. Start the microwave source generator 15 to output microwave energy to the target tissue 10 at a constant power.

[0096] S3. Acquisition unit 12 (e.g., VSWR acquisition sensor) acquires the VSWR (i.e., VSWR parameter) of the microwave ablation system during the microwave ablation process.

[0097] like Figure 4 As shown, Figure 4 This is a graph showing the VSWR as a function of load in related technologies. As the power output of the microwave source generator 15 continues, the water evaporation of the human lesion tissue will accelerate, the load impedance of the human lesion tissue will continue to increase, and the VSWR will increase with the increase of load. S4. Processing unit 13 determines whether to adjust the standing wave ratio (SWR) based on the SWR collected in step S3 by comparing the SWR collected in step S3 with the set threshold range set in step S1 (for example, the first set threshold range can be 1.15 to 1.5). When the SWR is not within the set threshold range, it is necessary to adjust the SWR and send a control signal (i.e., parameter adjustment control signal) to the adjustment control unit 14.

[0098] S5. Perform PID (Proportional-Integral-Derivative) control according to the control signal of S4, and transmit the adjustment parameters to the injection mechanism 11 (e.g., peristaltic pump or perfusion pump, the peristaltic pump or perfusion pump has a speed of 0 to 300 rpm and a flow rate of 0 to 110 ml / min).

[0099] S6. The injection mechanism 11 (e.g., a peristaltic pump or a perfusion pump) operates to control the standing wave ratio (SWR) to remain within a constant set threshold range (e.g., a second set threshold range may be around 1.2) under different loads. See [link to relevant documentation]. Figure 5 As shown.

[0100] S7. Continue to collect the standing wave ratio parameters of the microwave ablation system during the microwave ablation process.

[0101] S8. Repeat steps S5, S6, and S7 to enter the loop.

[0102] S9. End. That is, turn off the microwave source generator 15 and the liquid injection mechanism 11.

[0103] The control method of the microwave ablation system in this embodiment corresponds to the microwave ablation system described above. Its implementation principle is similar, and it can achieve similar technical effects. It will not be described again here.

[0104] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in related technologies that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0105] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0106] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A microwave ablation system, characterized in that, include: Injection mechanism; The acquisition unit is used to acquire the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process. The processing unit is electrically connected to both the acquisition unit and the adjustment control unit, and is used to send a parameter adjustment control signal to the adjustment control unit when the standing wave ratio parameter acquired by the acquisition unit exceeds a first set threshold range. The adjustment control unit, which is electrically connected to the acquisition unit, the processing unit, and the injection mechanism, is used to start a closed-loop control program after receiving the parameter adjustment control signal. Based on the standing wave ratio parameter acquired by the acquisition unit, the control unit adjusts the flow rate of the fluid medium delivered by the injection mechanism to the target tissue during microwave ablation, so that the standing wave ratio parameter falls within a second set threshold range; the first set threshold range is greater than the second set threshold range. A microwave source generator, electrically connected to the processing unit, is used to output microwave energy to the target tissue at a constant power according to the ablation signal sent by the processing unit. The ablation needle includes a conductive structure electrically connected to the microwave source generator and a water injection structure connected to the liquid injection mechanism via a pipeline. The conductive structure is used to output microwave energy to the target tissue, and the water injection structure is used to inject the fluid medium delivered by the liquid injection mechanism into the target tissue.

2. The microwave ablation system according to claim 1, characterized in that, Also includes: An input unit, electrically connected to the processing unit, is used to input a first set threshold range of the VSWR parameter and transmit the first set threshold range to the processing unit.

3. The microwave ablation system according to claim 1, characterized in that, The injection mechanism includes at least one of a peristaltic pump or a perfusion pump; The regulating control unit is electrically connected to the control terminal of at least one of the peristaltic pump or the injection pump, and is used to regulate the rotational speed of at least one of the peristaltic pump or the injection pump to adjust the flow rate of the fluid medium.

4. A control method for a microwave ablation system, characterized in that, Applied to the microwave ablation system as described in any one of claims 1 to 3, comprising: The acquisition unit collects the standing wave ratio (SWR) parameters of the microwave ablation system during the microwave ablation process; The processing unit determines whether the standing wave ratio parameter exceeds a first preset threshold range; When the standing wave ratio (SWR) parameter exceeds the first set threshold range, the control unit initiates a closed-loop control program to adjust the flow rate of the fluid medium delivered to the target tissue according to the SWR parameter, so that the SWR parameter falls within the second set threshold range; the first set threshold range is greater than the second set threshold range.

5. The control method for the microwave ablation system according to claim 4, characterized in that, When the standing wave ratio parameter exceeds the first set threshold range, the adjustment and control unit starts the closed-loop control program and adjusts the flow rate of the fluid medium delivered to the target tissue according to the standing wave ratio parameter, so that the standing wave ratio parameter falls within the second set threshold range. The first set threshold range is greater than the second set threshold range, including: When the standing wave ratio (SWR) parameter exceeds the first set threshold range, the control unit starts a closed-loop control program to determine whether the SWR parameter is greater than the set threshold; the set threshold is within the second set threshold range. When the standing wave ratio parameter is greater than the set threshold, the flow rate of the fluid medium delivered by the injection mechanism to the target tissue is increased; When the standing wave ratio parameter is less than or equal to the set threshold, the flow rate of the fluid medium delivered by the injection mechanism to the target tissue is reduced.

6. The control method for the microwave ablation system according to claim 4, characterized in that, Before the acquisition unit acquires the standing wave ratio (SWR) parameter of the microwave ablation system during microwave ablation, it also includes: The microwave source generator outputs microwave energy to the target tissue at a constant power.

7. The control method for the microwave ablation system according to any one of claims 4 to 6, characterized in that, The lower limit of the first set threshold range is 1.0 to 1.3, and the upper limit of the first set threshold range is 1.35 to 1.

65.

8. The control method for the microwave ablation system according to claim 4, characterized in that, When the standing wave ratio parameter exceeds the first set threshold range, the adjustment control unit adjusts the flow rate of the fluid medium delivered to the target tissue according to the standing wave ratio parameter, so that the standing wave ratio parameter falls within the second set threshold range. After the first set threshold range is greater than the second set threshold range, the method further includes: The processing unit triggers an alarm when the flow rate of the fluid medium delivered to the target tissue exceeds a preset flow rate, wherein the preset flow rate ranges from 2 to 10 milliliters per minute.

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