Steam saturation testing method and system based on microwave resonant cavity perturbation technology

Abstract

The invention relates to the technical field of medical health, and provides a steam saturation testing method and system based on a microwave resonant cavity perturbation technology, and the method comprises the steps: receiving a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by detecting a microwave resonant cavity by the vector network analyzer in the steam ablation process of the steam ablation equipment; the microwave resonant cavity is embedded in a steam conveying pipeline of the steam ablation equipment, and steam entering the microwave resonant cavity disturbs the microwave resonant cavity; and analyzing the resonant frequency and the dielectric constant, and determining the steam saturation of the steam ablation equipment. The microwave resonant cavity is embedded in the steam conveying pipeline of the steam ablation equipment, so that the influence of environmental factors and the like can be eliminated in the steam ablation process, the real-time online detection of the steam saturation is realized, and the detection precision and the response speed of the steam saturation are improved.

Description

Technical Field

[0001] The present invention relates to the field of medical health technology, and in particular to a steam saturation testing method and system based on microwave resonant cavity perturbation technology. Background Art

[0002] Steam ablation technology is increasingly being used in the medical field. During the ablation process, the energy ultimately delivered to the ablated tissue is a key indicator of ablation effectiveness. In steam ablation, the energy delivery medium is water vapor. Under operating conditions of approximately 1 PSI relative to atmospheric pressure (1 PSI is the tissue pressure required for the steam to break through), the water vapor is typically a gas-liquid mixture, inevitably containing small droplets. When water vapor energy is applied to the ablated tissue, the energy delivered consists of two components: phase change heat (heat released when the gas phase transforms into a liquid phase) and temperature differential heat (heat released when the liquid water cools to the ambient temperature of the ablated tissue). Phase change heat typically accounts for over 90% of this energy. Small droplets in the water vapor do not undergo a phase change when applied to the ablated tissue, thus releasing no phase change heat. However, phase change heat contributes significantly to the total heat output. Therefore, the droplet content in the water vapor serving as the ablation medium is crucial for ablation effectiveness. In other words, the vapor saturation of the water vapor serving as the medium is crucial for ablation effectiveness.

[0003] Currently, the most common method for assessing vapor saturation in steam ablation technology is the condensation method: a quantitative vapor sample is cooled and solidified in a medium. The vapor saturation is calculated based on the entropy change before and after the medium absorbs heat, combined with the conservation of mass and energy. This method is limited by physical factors such as heat loss during heat transfer, temperature measurement errors, and incomplete heat absorption. The measurement accuracy is low, and due to the large size of the test equipment and long calculation cycles, it is only suitable for factory inspection of steam ablation equipment and cannot achieve real-time online testing of vapor saturation in steam ablation equipment. Summary of the Invention

[0004] The present invention provides a steam saturation testing method and system based on microwave cavity perturbation technology, which is used to solve the defects of the existing technology in that the testing method of steam saturation in steam ablation is limited, the testing accuracy is low, and online real-time testing cannot be achieved.

[0005] The present invention provides a steam saturation test system based on microwave resonant cavity perturbation technology, comprising the following steps: receiving a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by the vector network analyzer by detecting a microwave resonant cavity during steam ablation by a steam ablation device; the microwave resonant cavity is embedded in a steam delivery pipeline of the steam ablation device, and the steam entering the microwave resonant cavity causes a disturbance to the microwave resonant cavity; analyzing the resonance frequency and the dielectric constant to determine the steam saturation of the steam ablation device.

[0006] The steam saturation test method based on the microwave resonant cavity perturbation technology according to the present application further comprises, before the resonance frequency and the dielectric constant are received on the vector network analyzer: generating a first driving signal after power-on initialization, and sending the first driving signal to the vector network analyzer; The vector network analyzer detects initialization parameters of the microwave resonant cavity under the driving of the first driving signal; the initialization parameters include an initial resonance frequency.

[0007] The steam saturation test method based on the microwave resonant cavity perturbation technology according to the present application, wherein the analyzing the resonance frequency and the dielectric constant to determine the steam saturation of the steam ablation device comprises: calibrating a sensitivity coefficient based on the initial resonance frequency and the dielectric constant; the sensitivity coefficient is used to represent the sensitivity of the resonance frequency change to the humidity; determining a frequency offset according to the resonance frequency and the initial resonance frequency; calculating the steam humidity in the microwave resonant cavity based on the sensitivity coefficient and the frequency offset, and determining the steam saturation of the steam ablation device based on the steam humidity.

[0008] The steam saturation test method based on the microwave resonant cavity perturbation technology according to the present application, wherein the initialization parameters further include an initial temperature. The steam humidity is calculated in the following manner: Steam humidity = f (frequency offset, sensitivity coefficient, temperature compensation coefficient) ; wherein, the sensitivity coefficient, the frequency offset, the temperature compensation coefficient, the steam temperature, and the initial temperature in the microwave resonant cavity; the steam temperature is detected by the vector network analyzer on the microwave resonant cavity.

[0009] The steam saturation test method based on the microwave resonant cavity perturbation technology according to the present application, wherein the sensitivity coefficient is calculated in the following manner: ; wherein, represents the cavity volume of the microwave resonant cavity, represents the effective volume of the steam in the cavity of the microwave resonant cavity, is an initial resonant frequency, is a real part of a dielectric constant; is a real part of a dielectric constant; is obtained by calibration.

[0010] The steam saturation test method based on the microwave resonant cavity perturbation technology further comprises the following steps before the resonant frequency and the dielectric constant are received by the vector network analyzer: generate a second driving signal in the case that a steam start signal of the steam ablation device is detected; the steam start signal is used to drive a steam generation component of the steam ablation device to generate steam; send the second driving signal to the vector network analyzer; the vector network analyzer detects the resonant frequency and the dielectric constant of the microwave resonant cavity under steam perturbation at a preset frequency under the driving of the second driving signal until a driving stop signal is received; the driving stop signal is generated in the case that a steam stop signal of the steam ablation device is detected; the steam stop signal is used to control the steam generation component to stop running.

[0011] The steam saturation test method based on the microwave resonant cavity perturbation technology further comprises the following steps before the resonant frequency and the dielectric constant are received by the vector network analyzer: generate a timing task corresponding to the second driving signal; the timing task corresponds to a preset delay time length; in the case that the delay time length corresponding to the timing task is reached, send the second driving signal to the vector network analyzer.

[0012] The steam saturation test method based on the microwave resonant cavity perturbation technology further comprises the following steps after the resonant frequency and the dielectric constant are analyzed to determine the steam saturation of the steam ablation device: archive the resonant frequency, the dielectric constant and the steam saturation; compare the steam saturation with a calibrated saturation threshold value; in the case that the steam saturation is less than or equal to the saturation threshold value, generate and output a warning prompt information of the steam saturation.

[0013] The steam saturation test method based on the microwave resonant cavity perturbation technology further comprises the following steps before the resonant frequency and the dielectric constant are received by the vector network analyzer: The steam generated by the steam generating assembly enters the microwave resonance cavity through the steam inlet, then enters the steam delivery pipe through the steam outlet, and is delivered to the tissue to be ablated via the steam delivery pipe.

[0014] According to the steam saturation testing method based on microwave cavity perturbation technology provided by the present invention, the vector network analyzer includes an input connecting line and an output connecting line, the input connecting line is connected to the port of the steam inlet, and the output connecting line is connected to the port of the steam outlet.

[0015] The present invention also provides a steam saturation test system based on microwave resonant cavity perturbation technology, comprising a host computer, a vector network analyzer and a microwave resonant cavity: The microwave resonant cavity is embedded in a steam delivery pipeline of a steam ablation device. During the steam ablation process of the steam ablation device, the steam entering the microwave resonant cavity causes disturbance to the microwave resonant cavity. The vector network analyzer is used to detect the resonant frequency and dielectric constant of the microwave resonant cavity under steam disturbance; The host computer is used to analyze the resonant frequency and the dielectric constant to determine the steam saturation of the steam ablation device.

[0016] According to the steam saturation test system based on microwave cavity perturbation technology provided by the present invention, the host computer and the vector network analyzer are deployed in the steam ablation host of the steam ablation device.

[0017] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, it implements any of the above-described steam saturation test methods based on microwave cavity perturbation technology.

[0018] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steam saturation test method based on microwave cavity perturbation technology as described above is implemented.

[0019] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-described steam saturation testing methods based on microwave cavity perturbation technology.

[0020] The present invention also provides a steam ablation device, which measures steam saturation using any of the above-mentioned steam saturation testing methods based on microwave resonant cavity perturbation technology during steam ablation.

[0021] The steam saturation testing method and system based on microwave resonant cavity perturbation technology provided by the present invention are achieved by setting an embedded microwave resonant cavity in the steam delivery pipeline of the steam ablation equipment. During the steam ablation process, the steam used for ablation passes through the microwave resonant cavity, forming a tiny disturbance to the microwave resonant cavity. The vector network analyzer can detect the resonant frequency and dielectric constant of the microwave resonant cavity under steam disturbance in real time. By analyzing the resonant frequency and dielectric constant, the steam saturation of the steam ablation equipment is determined, thereby realizing real-time online detection of the steam saturation of the steam ablation equipment used for ablation. Moreover, the microwave resonant cavity can be used as part of the steam delivery pipeline. The measurement of steam saturation will not interfere with the steam ablation process and will not be affected by other environmental factors. This solves the problem of limited steam saturation testing and improves the detection accuracy and response speed of steam saturation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a flow chart of the steam saturation testing method based on microwave resonant cavity perturbation technology provided by the present invention.

[0024] Figure 2 This is one of the structural schematic diagrams of the steam saturation testing system based on microwave cavity perturbation technology provided in an embodiment of the present invention.

[0025] Figure 3 It is a schematic cross-sectional structural diagram of a steam ablation device provided in an embodiment of the present invention.

[0026] Figure 4 It is a partial cross-sectional schematic diagram of the steam ablation device provided by an embodiment of the present invention.

[0027] Figure 5 Schematic diagram of the structure of the microwave resonant cavity provided by an embodiment of the present invention.

[0028] Figure 6 This is the second structural diagram of the steam saturation testing system based on microwave cavity perturbation technology provided in an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the steam saturation test process provided by an embodiment of the present invention.

[0030] Figure 8 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] Embodiments of the present invention provide a vapor saturation testing method based on microwave cavity perturbation technology for measuring vapor saturation in steam ablation devices. By embedding a microwave cavity in the device's steam delivery pipeline, the method measures changes in the microwave cavity's resonant frequency and the dielectric constant of the moist, hot steam in the microwave range after the cavity is introduced. The method then calculates vapor saturation based on changes in the dielectric constant and resonant frequency of the mixed medium within the microwave cavity. This embedded microwave cavity enables real-time, online detection of vapor saturation, offering fast response and high accuracy, addressing the limitations of vapor saturation testing.

[0033] Specifically, Figure 1 Schematic diagram of the process of the steam saturation test method based on microwave resonant cavity perturbation technology provided by the present invention. Figure 1 As shown, the steam saturation test method based on microwave cavity perturbation technology includes the following steps: Step 100: Receive a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by the vector network analyzer by detecting a microwave resonant cavity during steam ablation by a steam ablation device; the microwave resonant cavity is embedded in a steam delivery pipeline of the steam ablation device, and steam entering the microwave resonant cavity causes a disturbance in the microwave resonant cavity; Step 200: Analyze the resonant frequency and the dielectric constant to determine the vapor saturation of the vapor ablation device.

[0034] Receive the resonant frequency and dielectric constant uploaded by the vector network analyzer. These resonant frequency and dielectric constant are obtained by the vector network analyzer when the microwave resonant cavity is tested during the steam ablation process. Analyze the detected resonant frequency and dielectric constant to determine the steam saturation of the steam ablation device.

[0035] Among them, the microwave resonant cavity is embedded in the steam delivery pipeline of the steam ablation equipment. During the steam ablation process of the steam ablation equipment, the steam entering the microwave resonant cavity disturbs the microwave resonant cavity, thereby causing changes in the resonant frequency and dielectric constant of the microwave resonant cavity. Under different steam saturation conditions, the corresponding resonant frequency and dielectric constant are different.

[0036] As an embodiment, the steam saturation test method based on microwave resonant cavity perturbation technology provided by the embodiment of the present invention is applied to the steam saturation test system based on microwave resonant cavity perturbation technology, referring to Figure 2 The system includes a host computer, a vector network analyzer and a microwave resonant cavity, wherein: The microwave resonant cavity is embedded in a steam delivery pipeline of a steam ablation device. During the steam ablation process of the steam ablation device, the steam entering the microwave resonant cavity causes disturbance to the microwave resonant cavity. The vector network analyzer is used to detect the resonant frequency and dielectric constant of the microwave resonant cavity under steam disturbance; The host computer is used to analyze the resonant frequency and the dielectric constant to determine the steam saturation of the steam ablation device.

[0037] The steam saturation test system based on microwave resonant cavity perturbation technology includes a host computer, a vector network analyzer and a microwave resonant cavity. In some embodiments, it may also include a steam ablation device. The host computer, the vector network analyzer and the microwave resonant cavity are connected in sequence, and the microwave resonant cavity is embedded in the steam delivery pipeline of the steam ablation device. Optionally, the steam saturation test method based on microwave resonant cavity perturbation technology provided in an embodiment of the present invention is specifically applied to the host computer in the steam saturation test system based on microwave resonant cavity perturbation technology. The host computer can be a terminal or electronic device such as a personal computer PC, or a processor deployed in an electronic device, and there is no specific limitation on this.

[0038] The connection between the host computer and the vector network analyzer can be a communication connection or a physical connection, and the connection between the vector network analyzer and the microwave resonant cavity is a physical connection.

[0039] During steam ablation, the steam used for ablation is delivered to the tissue to be ablated via a steam delivery pipeline. The microwave resonant cavity is embedded in the steam delivery pipeline and forms part of it. Therefore, the steam delivered through the steam delivery pipeline passes through the microwave resonant cavity during the delivery process. The steam entering the microwave resonant cavity disturbs the microwave resonant cavity, causing the resonant frequency of the microwave resonant cavity to change.

[0040] The vector network analyzer is used to detect the resonance frequency and dielectric constant of the microwave resonant cavity under the disturbance of the steam. During the steam ablation process, the vector network analyzer can detect the resonance frequency and dielectric constant of the microwave resonant cavity in real time when the steam used for ablation passes through the microwave resonant cavity.

[0041] The host computer is used to analyze the resonance frequency and dielectric constant detected by the vector network analyzer, and determine the steam saturation degree of the steam ablation device used for ablation. Generally, the static dielectric constant of saturated water vapor is about 1, the static dielectric constant of water is 80, and the wet steam can be regarded as a mixture of saturated water vapor and water (small water droplet particles), and the effective dielectric constant is between saturated water vapor and water, which is determined by the content of saturated water vapor in the wet steam, that is, by the steam saturation degree of the wet steam. Therefore, under the condition of testing the resonance frequency and dielectric constant of the ablation steam, the steam saturation degree of the ablation steam can be calculated.

[0042] The microwave resonant cavity is a structure that can store electromagnetic energy at a specific frequency. When the frequency of the input signal is consistent with the natural frequency of the resonant cavity, resonance occurs, which is manifested as reflection coefficient and transmission coefficient. Among them, the reflection coefficient is manifested as the minimum (series resonance) or maximum (parallel resonance) of the reflected signal amplitude, and the transmission coefficient is manifested as the maximum (transmission peak) or minimum (transmission valley) of the amplitude when the energy passes through the resonant cavity.

[0043] The vector network analyzer accurately determines the resonance frequency by sweeping the frequency excitation and signal analysis, and using the extreme value of the reflection or transmission characteristics of the microwave resonant cavity at the resonance frequency. Specifically, the vector network analyzer outputs an excitation signal as a sweep signal, measures the amplitude and phase of the reflected signal or transmitted signal after passing through the microwave resonant cavity, to measure the resonance frequency of the microwave resonant cavity and the dielectric constant of the mixed medium in the microwave resonant cavity. Among them, the extreme point of the reflection coefficient or the transmission coefficient in the sweep signal corresponds to the resonance frequency, and the dielectric constant can be calculated by the phase change rate.

[0044] The host computer analyzes the resonance frequency and dielectric constant detected by the vector network analyzer, and determines the steam saturation degree of the steam ablation device. Optionally, the microwave resonant cavity can be calibrated for the resonance frequency and dielectric constant under saturated steam, or for the resonance frequency and dielectric constant under steam with a known saturation degree. During the steam ablation process of the steam ablation device, the steam used for ablation is transported through the microwave resonant cavity, and the vector network analyzer detects the resonance frequency and dielectric constant of the microwave resonant cavity in real time. The real-time detected resonance frequency and dielectric constant are compared with the calibrated resonance frequency and dielectric constant, the calibrated steam saturation degree is used as a reference, and the steam saturation degree used for ablation is determined by the change of the resonance frequency and dielectric constant.

[0045] In this embodiment, a microwave resonant cavity is embedded in the steam delivery pipeline of the steam ablation device. During the steam ablation process, the steam used for ablation passes through the microwave resonant cavity, causing a tiny disturbance to the microwave resonant cavity. The vector network analyzer can detect the resonant frequency and dielectric constant of the microwave resonant cavity under the steam disturbance in real time. By analyzing the resonant frequency and dielectric constant, the steam saturation of the steam ablation device is determined, thereby realizing real-time online detection of the steam saturation of the steam ablation device used for ablation. Moreover, as part of the steam delivery pipeline, the microwave resonant cavity will not interfere with the steam ablation process during the test, nor will it be affected by other environmental factors. This solves the problem of limited steam saturation testing and improves the detection accuracy and response speed of steam saturation.

[0046] In one embodiment, referring to Figure 3 The cross-sectional view of the steam ablation device shown in the figure shows that inside the steam ablation device, the steam delivery pipeline includes a steam generating assembly and a steam delivery pipe. The steam generating assembly is used to generate steam. One end of the cavity of the microwave resonant cavity is connected to the steam generating assembly, and the other end is connected to the steam delivery pipe. That is, the steam generating assembly, the microwave resonant cavity and the steam delivery pipe are connected in sequence to constitute the steam delivery pipeline of the steam ablation device. The microwave resonant cavity is embedded in the steam delivery pipeline of the steam ablation device and becomes a part of the steam delivery pipeline.

[0047] Specifically, refer to Figure 4 , Figure 4 Yes Figure 3 The partial enlarged view of the cross-sectional view of the steam ablation device shown in FIG. Figure 4 In the embodiment, the microwave resonant cavity is connected to a steam generating assembly and a steam pipe at each end. A steam inlet and a steam outlet are provided at each end of the microwave resonant cavity. The steam inlet is connected to the steam generating assembly of the steam ablation device, and the steam outlet is connected to the steam pipe of the steam ablation device. The steam generating assembly, microwave resonant cavity, and steam pipe are connected in sequence to form the steam delivery pipeline of the steam ablation device.

[0048] In one embodiment, the microwave resonant cavity is a hollow chamber enclosed by a conductive wall. A steam inlet is provided at one end of the cavity, and a steam outlet is provided at the other end, with the steam inlet and the steam outlet being arranged opposite each other. The steam inlet is connected to a steam generating assembly of a steam ablation device, and the steam outlet is connected to a steam delivery pipe of the steam ablation device.

[0049] Figure 3 and Figure 4The cavity volume of the microwave resonant cavity shown in the figure is approximately 0.35 ml. During steam ablation, 0.42 ml of water needs to be converted into the heat required for steam in one treatment. Based on the steam density, steam conversion efficiency, and pipeline loss, the effective steam volume for each treatment is greater than 350 ml, which is about two orders of magnitude larger than the cavity volume of the microwave resonant cavity. Therefore, the impact of the embedding of the microwave resonant cavity on the treatment effect and the impact of insufficient steam on the measurement accuracy can be ignored.

[0050] Optionally, during the steam ablation process performed by the steam ablation device, the steam generated by the steam generating assembly enters the microwave resonant cavity through the steam inlet of the microwave resonant cavity, then enters the steam pipe through the steam outlet of the microwave resonant cavity, and finally the steam is transported to the tissue to be ablated via the steam pipe.

[0051] Furthermore, the vector network analyzer includes an input connection line and an output connection line, and the cavity of the microwave resonant cavity is also provided with a port connected to the vector network analyzer, and the port is provided on the steam inlet and the steam outlet. Figure 5 The structure of the microwave resonant cavity is shown, and the input connection line of the vector network analyzer is connected to the steam inlet port of the microwave resonant cavity ( Figure 5 The output line of the vector network analyzer is connected to the port at the steam outlet of the microwave resonant cavity ( Figure 5 In the network analyzer Out) connection. Figure 5 In the figure, the arrows are used to indicate the delivery direction of moist hot steam (Vapor), which correspond to the steam inlet and steam outlet of the microwave resonant cavity respectively.

[0052] Optionally, for easy distinction, the port on the cavity connected to the vector network analyzer includes a first port connected to the input connection line and a second port connected to the output connection line, wherein the port at the steam inlet end is the first port and the port at the steam outlet end is the second port. Figure 5 As shown, the first port at the steam inlet end is configured so that the connection direction of the input connection line is perpendicular to the steam input direction of the steam inlet, and the second port at the steam outlet end is configured so that the connection direction of the output connection line is perpendicular to the steam delivery direction of the steam outlet.

[0053] As an optional embodiment, the steam inlet of the microwave resonant cavity includes a first segment in the horizontal direction and a second segment vertically connected to the first segment. The steam outlet includes a third segment horizontally disposed opposite the first segment and a fourth segment vertically connected to the third segment and opposite the second segment. A first port for connecting an input connection line is disposed on an extension of the first segment and perpendicular to the second segment, and a second port for connecting an output connection line is disposed on an extension of the third segment and perpendicular to the fourth segment.

[0054] Furthermore, the connection direction of the input connecting line is parallel to the steam delivery direction of the first segment and perpendicular to the steam delivery direction of the second segment. Correspondingly, the connection direction of the output connecting line is parallel to the steam delivery direction of the third segment and perpendicular to the steam delivery direction of the fourth segment.

[0055] Alternatively, a microwave resonant cavity is a hollow chamber enclosed by conductive walls. Electromagnetic waves reflect off the cavity walls, forming standing waves, exhibiting electromagnetic resonance. The frequency of the electromagnetic waves at this point is the resonant frequency of the cavity. When the dielectric constant of the medium filling the cavity changes (such as when the saturation of moist steam causes a change in the dielectric constant), the electromagnetic field distribution within the cavity is slightly perturbed, causing a change in the resonant frequency. Therefore, the change in resonant frequency corresponds to a change in the dielectric constant of the medium within the microwave resonant cavity. When the medium within the cavity is moist steam, the change in its dielectric constant corresponds to a change in the steam saturation.

[0056] Furthermore, when the hot and humid steam fills the cavity of the microwave resonant cavity, the hot and humid steam becomes the cavity medium of the microwave resonant cavity, and the change of its steam saturation causes the effective dielectric constant of the medium to change, thereby causing the resonant frequency to change.

[0057] In the microwave band (such as 8GHz), saturated water vapor exhibits a complex dielectric constant, and both its real and complex parts are expressed. Therefore, in the microwave band, hot and humid steam exhibits a complex dielectric constant, which can be expressed as ,in, is the real part of the dielectric constant, is the complex part (or imaginary part) of the dielectric constant.

[0058] The real part of the dielectric constant represents the polarizability of a gas under the influence of an electric field, that is, the degree to which gas molecules are polarized in an alternating electric field. It reflects the changes in the phase velocity and wavelength of electromagnetic waves propagating through the gas. The real part of the dielectric constant of water vapor is significantly higher than that of dry air. Therefore, an increase in water vapor humidity (i.e., an increase in vapor saturation) increases the real part of the dielectric constant of the medium within the microwave resonant cavity, thereby reducing the resonant frequency.

[0059] The imaginary part of the dielectric constant represents the energy loss of the gas to electromagnetic waves, which is mainly caused by molecular polarization relaxation (such as the dipole rotation of water molecules to polarization) or conductivity loss. The larger the imaginary part, the stronger the attenuation (absorption) of electromagnetic waves propagating in the gas. The imaginary part of the dielectric constant of water vapor is higher in the microwave frequency band.

[0060] The change of the resonant frequency of the microwave resonant cavity is mainly determined by the real part of the dielectric constant of the medium in the cavity. Determine that when the water vapor humidity increases, increases, the resonant frequency decreases.

[0061] The detection of the microwave resonant cavity by the vector network analyzer is driven by a driving signal of the host computer, specifically, based on the communication connection between the host computer and the vector network analyzer, the host computer drives the vector network analyzer to detect the resonant frequency and the dielectric constant of the microwave resonant cavity through the driving signal.

[0062] Based on this, before step 100, it can also include: Step 01, in the case of detecting the steam start signal of the steam ablation device, a second driving signal is generated; the steam start signal is used to drive the steam generation component of the steam ablation device to generate steam; Step 02, the second driving signal is sent to the vector network analyzer; the vector network analyzer detects the resonant frequency and the dielectric constant of the microwave resonant cavity under the disturbance of the steam at a preset frequency under the driving of the second driving signal until a driving stop signal is received; Wherein, the steam off signal is used to control the steam generation component to stop running; the driving stop signal is generated in the case of detecting the steam off signal of the steam ablation device; the steam off signal is used to control the steam generation component to stop running.

[0063] The host computer generates a second driving signal in the case of detecting the steam start signal of the steam ablation device, and sends the second driving signal to the vector network analyzer to drive the vector network analyzer to detect the microwave resonant cavity.

[0064] And the vector network analyzer detects the resonant frequency and the dielectric constant of the microwave resonant cavity under the disturbance of the steam under the driving of the first driving signal.

[0065] Further, the detection of the microwave resonant cavity by the vector network analyzer is carried out at a preset frequency, that is, the vector network analyzer detects the resonant frequency and the dielectric constant of the microwave resonant cavity under the disturbance of the steam at a preset frequency under the driving of the second driving signal generated by the host computer.

[0066] As an embodiment, the vector network analyzer uploads the detected resonant frequency and dielectric constant to the host computer in real time until a driving stop signal is received. The driving stop signal is generated by the host computer in the case of detecting the steam off signal and sent to the vector network analyzer, and the vector network analyzer stops running under the instruction of the driving stop signal, thereby stopping the detection of the microwave resonant cavity.

[0067] Wherein, the steam start signal and the steam off signal are generated or triggered by the steam ablation device, the steam start signal is used to drive the steam generation component to generate steam, and the steam off signal is used to instruct the steam generation component to stop running, thereby stopping the generation of steam.

[0068] In one embodiment, the steam start signal and the steam stop signal may be generated by a user of the steam ablation device operating the steam ablation device during the steam ablation process.

[0069] Optionally, the vector network analyzer performs delayed detection of the microwave resonant cavity. After the steam ablation device initiates treatment and generates steam, it takes approximately 0.3 seconds for the steam to fill the steam delivery pipeline, resulting in a certain delay in steam delivery. Therefore, after detecting the steam start signal, the host computer also generates a timed task. After the delay corresponding to the timed task expires, the generated second drive signal is sent to the vector network analyzer, driving the vector network analyzer to detect the microwave resonant cavity.

[0070] Based on this, step 02 includes: Step 021, generating a timing task corresponding to the second driving signal; the timing task corresponds to a preset delay time; Step 022: When the delay time corresponding to the timing task is reached, the second driving signal is sent to the vector network analyzer.

[0071] That is, when the upper computer detects the steam start signal of the steam ablation device, it generates a timing task corresponding to the second drive signal, and the timing task corresponds to the preset delay duration; when the delay duration corresponding to the timing task is reached, the upper computer sends the second drive signal to the vector network analyzer.

[0072] When the upper computer detects the steam start signal of the steam ablation device, it generates a second drive signal and generates a timed task corresponding to the second drive signal. The timed task corresponds to a preset delay time, which is a timed sending task of the second drive signal. The delay time can be determined based on the time it takes for steam to fill the steam delivery pipeline. The time it takes for steam to fill the steam delivery pipeline refers to the time it takes for steam to be generated from the start to fill the steam delivery pipeline.

[0073] For example, if the time required for steam to be generated from startup to fill the steam delivery pipeline is 0.3 seconds, the delay duration corresponding to the scheduled task of the host computer can be the same as the time required for steam to fill the delivery pipeline, that is, set to 0.3 seconds, or it can be slightly longer than the time required for steam to fill the delivery pipeline, for example, set to 0.4 seconds. It should be noted that the time required for steam to be generated from startup to fill the steam delivery pipeline can be obtained through calibration.

[0074] When the delay time corresponding to the timing task is reached, the host computer sends the generated second driving signal to the vector network analyzer, driving the vector network analyzer to detect the resonant frequency and dielectric constant of the microwave resonant cavity under steam disturbance.

[0075] In one embodiment, upon detecting a steam activation signal from the steam ablation device, the host computer generates a second drive signal and a timed task. Upon reaching the delay time corresponding to the timed task, the host computer transmits the second drive signal to a vector network analyzer. Driven by the second drive signal, the vector network analyzer detects the resonant frequency and dielectric constant of the microwave cavity at a preset frequency.

[0076] As an embodiment, before the steam ablation device performs steam ablation, it is also necessary to detect the initialization parameters of the microwave resonant cavity in the current use environment of the steam ablation device as a reference for measuring steam saturation. Therefore, before step 100, the following may also be included: Step 10: Generate a first drive signal after power-on initialization, and send the first drive signal to the vector network analyzer; the vector network analyzer, driven by the first drive signal, detects the initialization parameters of the microwave resonant cavity; the initialization parameters include the initial resonant frequency.

[0077] After power-on initialization, the host computer generates a first driving signal and sends the first driving signal to the vector network analyzer; driven by the first driving signal, the vector network analyzer detects the initialization parameters of the microwave resonant cavity; the initialization parameters include the initial resonant frequency.

[0078] Optionally, the detected initialization parameters of the microwave resonant cavity in the initial state may further include an initial dielectric constant.

[0079] In one embodiment, after power-on initialization, the host computer generates a first drive signal and sends it to a vector network analyzer to drive the vector network analyzer to detect the initial resonant frequency and initial dielectric constant of the microwave resonant cavity. Upon detecting a steam activation signal from the steam ablation device, the host computer generates a second drive signal and a timed task. Upon reaching the delay time corresponding to the timed task, the host computer sends the second drive signal to the vector network analyzer to drive the vector network analyzer to detect the resonant frequency and dielectric constant of the microwave resonant frequency under steam disturbance.

[0080] Optional, see Figure 6 , Figure 6 This is another structural diagram of the steam saturation testing system based on microwave cavity perturbation technology. The host computer and the vector network analyzer are deployed in the steam ablation host corresponding to the steam ablation device. When the steam saturation testing system based on microwave cavity perturbation technology includes the steam ablation device, the steam saturation testing system based on microwave cavity perturbation technology can further include a steam ablation host.

[0081] As an embodiment, the steam ablation host can be a terminal or an electronic device. When the steam ablation host is an electronic device, the host computer can be a processor deployed in the steam ablation host, and the vector network analyzer can be deployed in the steam ablation host through external or built-in methods.

[0082] The steam ablation host is used to control the steam ablation device. The host computer is powered on and initialized simultaneously with the host computer. The steam ablation device is connected to the steam ablation host computer. The steam start signal and steam shutoff signal can be generated by the steam ablation host computer. Optionally, the steam start signal and steam shutoff signal are generated by the steam ablation host computer under user triggering. The user can trigger the host computer to generate the steam start signal and steam shutoff signal by using the steam ablation device or by using the host computer. There are no specific restrictions on this.

[0083] The host computer analyzes the resonant frequency and dielectric constant detected by the vector network analyzer to determine the steam saturation of the steam ablation device. Optionally, the host computer analyzes the initialization parameters, resonant frequency and dielectric constant detected by the vector network analyzer to determine the steam saturation of the steam ablation device.

[0084] Based on this, step 200 includes: Step 201: calibrate a sensitivity coefficient based on the initial resonant frequency and the dielectric constant; the sensitivity coefficient is used to characterize the sensitivity of the resonant frequency change to humidity; Step 202: determining a frequency offset according to the resonant frequency and the initial resonant frequency; Step 203 : Calculate the steam humidity in the microwave resonant cavity based on the sensitivity coefficient and the frequency offset, and determine the steam saturation of the steam ablation device based on the steam humidity.

[0085] First, the sensitivity coefficient is calibrated based on the initial resonant frequency and dielectric constant. The sensitivity coefficient is used to characterize the sensitivity of the resonant frequency change to humidity, which is closely related to the steam saturation.

[0086] Then, the frequency offset of the microwave resonant cavity is determined based on the detected resonant frequency and the initial resonant frequency. The frequency offset represents the frequency change of the resonant frequency of the microwave resonant cavity under steam disturbance relative to the initial resonant frequency in the initial state at startup.

[0087] Finally, the steam humidity in the microwave resonant cavity is calculated based on the calibrated sensitivity coefficient and frequency offset, and the steam saturation of the steam ablation device is determined based on the steam humidity.

[0088] In one embodiment, the vector network analyzer is further configured to detect the vapor temperature within the microwave resonant cavity. The detected initialization parameters of the microwave resonant cavity also include the initial temperature. Based on this, the host computer is configured to analyze the resonant frequency, dielectric constant, vapor temperature, and initialization parameters of the microwave resonant cavity detected by the vector network analyzer to determine the vapor saturation of the steam ablation device.

[0089] Furthermore, the host computer analyzes the resonant frequency, dielectric constant, steam temperature, and initialization parameters to determine the steam saturation of the steam ablation device, including: Calibrate a sensitivity coefficient based on the initial resonant frequency and the dielectric constant; the sensitivity coefficient is used to characterize the sensitivity of the resonant frequency change to humidity; determining a frequency offset according to the resonant frequency and the initial resonant frequency; determining a temperature difference according to the steam temperature and the initial temperature; The steam humidity in the microwave resonance cavity is calculated based on the sensitivity coefficient, the frequency offset, and the temperature difference, and the steam saturation of the steam ablation device is determined based on the steam humidity.

[0090] In one embodiment, the steam humidity can be calculated according to the following formula 1: Steam humidity = ; (1) in, is the calibrated sensitivity coefficient, is the frequency offset, is the temperature compensation coefficient, which is a configurable fixed constant. is the steam temperature in the microwave resonant cavity detected by the vector network analyzer, is the initial temperature in the microwave cavity.

[0091] Optional, , K is the unit of temperature (Kelvin), Indicates the difference between the steam temperature and the initial temperature in the microwave cavity, the temperature compensation coefficient Used to correct the effect of temperature changes on the resonant frequency.

[0092] Accordingly, the sensitivity coefficient is calibrated based on the initial resonant frequency, the dielectric constant, the cavity volume of the microwave resonant cavity, and the effective volume occupied by the steam in the cavity of the microwave resonant cavity.

[0093] The sensitivity coefficient is calculated as shown in the following formula 2: ; (2) In formula 2, represents the cavity volume of the microwave resonant cavity, represents an effective volume occupied by the steam in the cavity of the microwave resonant cavity, is an initial resonant frequency, is a real part of a dielectric constant; and The calibration can be obtained, for example, during factory inspection of the steam ablation device.

[0094] Optionally, based on the calculated steam humidity, the steam saturation of the steam ablation device is determined, specifically, the sum of the steam humidity and the steam saturation is 1, that is, the steam saturation = 1-steam humidity.

[0095] For the steam ablation device, its use environment is dynamically changing, and different environmental factors such as environmental temperature and environmental humidity will affect the initial state of the microwave resonant cavity when it is not in use. To ensure the accuracy of the test results of the steam saturation, when the steam ablation host is powered on, the host computer is powered on and initialized at the same time, and the first driving signal is generated to drive the vector network analyzer to detect the initialization parameters of the microwave resonant cavity, which is used as a reference basis for the test of the steam saturation, so as to exclude the influence of environmental changes on the test results of the steam saturation.

[0096] In one embodiment, referring to the saturation test process shown in Figure 7 , after analyzing the resonant frequency and the dielectric constant to determine the steam saturation of the steam ablation device, the host computer is also used to archive the original data detected by the vector network analyzer and the measured steam saturation, and to give a warning prompt for the steam saturation that does not meet the requirements. Therefore, after step 200, the following steps can also be included: Step 300, archiving the resonant frequency, the dielectric constant and the steam saturation; Step 400, comparing the steam saturation with a calibrated saturation threshold, and generating and outputting a warning prompt information for the steam saturation if the steam saturation is less than or equal to the saturation threshold.

[0097] As shown in Figure 7 , when the steam ablation device performs steam ablation, first, the steam ablation host (i.e. the host in Figure 7 ) needs to be powered on and initialized, the host computer deployed in the steam ablation host is powered on and initialized at the same time, and the vector network analyzer is started to detect the initialization parameters of the microwave resonant cavity, including the initial resonant frequency, the initial dielectric constant and the initial temperature, etc., through the first driving signal generated by the host computer, and then waits for the user to perform IO operation.

[0098] The IO operation can be an external input operation triggered by a user to control the vapor ablation device to perform ablation, for example, an operation of triggering generation and shutdown of vapor, and the user triggers the host to generate a vapor start signal or a vapor shutdown signal through the IO operation.

[0099] The host drives the vector network analyzer to detect the resonance frequency, dielectric constant and vapor temperature of the microwave resonant cavity under vapor disturbance after a delay of 0.3 seconds in the case of detecting the vapor start signal, and uploads the detected data to the host. The vapor generation assembly of the vapor ablation device generates vapor under the driving of the vapor start signal, and the generated vapor enters the vapor delivery pipe through the microwave resonant cavity and is delivered to the tissue to be ablated by the vapor delivery pipe.

[0100] The host drives the vector network analyzer to detect the resonance frequency, dielectric constant and vapor temperature of the microwave resonant cavity after a delay of 0.3 seconds, specifically by generating a second driving signal and a corresponding timing task, the corresponding delay time of the timing task is 0.3 seconds, and the second driving signal is sent to the vector network analyzer when the corresponding delay time of the timing task is reached, that is, when 0.3 seconds is reached. At this time, the vapor generated by the vapor generation assembly has filled the vapor delivery pipeline, and the vector network analyzer detects the resonance frequency, dielectric constant and vapor temperature of the microwave resonant cavity under the driving of the second driving signal at a preset frequency.

[0101] Optionally, the vector network analyzer detects the resonance frequency, dielectric constant and vapor temperature of the microwave resonant cavity under the driving of the second driving signal at a preset frequency. The delay driving of the vector network analyzer for detection is to ensure that the vapor can fill the vapor delivery pipeline, and the effective volume of the vapor in the cavity of the microwave resonant cavity reaches the effective volume at the calibration time, so as to ensure the accuracy of the measurement of the vapor saturation degree.

[0102] In the case that the host does not detect the vapor shutdown signal, the vector network analyzer continues to detect the resonance frequency and dielectric constant of the microwave resonant cavity at a preset frequency until a driving stop signal is received. The driving stop signal is generated and sent to the vector network analyzer by the host in the case of detecting the vapor shutdown signal, and the vector network analyzer stops running and detecting under the control of the driving stop signal.

[0103] The vapor shutdown signal can also be generated by the vapor ablation host based on the IO operation to drive the vapor ablation assembly in the vapor ablation device to stop generating vapor.

[0104] After the vector network analyzer stops detecting the microwave resonance cavity, the host computer analyzes the resonance frequency and dielectric constant and other data uploaded by the vector network analyzer to determine the steam saturation of the steam ablation device. In an embodiment, the steam generation assembly generates steam according to the set steam release period to achieve periodic release of steam. The host computer divides the data uploaded by the vector network analyzer according to the steam release period, divides the data detected in the same steam release period into the same array, and performs correlation operation on each array and the calibration data respectively. The calibration data includes the volume of the microwave resonance cavity and the effective volume occupied by the steam in the microwave resonance cavity during the steam ablation process. The volume of the microwave resonance cavity is the volume of the cavity of the microwave resonance cavity.

[0105] It should be noted that in the case of periodic generation and release of steam by the steam generation assembly, the steam off signal can also be automatically generated according to the steam release period. From the generation of the steam on signal, when the duration of the corresponding period of the steam release period is reached, the steam off signal is automatically generated to drive the steam generation assembly to stop generating steam. The host computer receives the resonance frequency and dielectric constant and other data detected and uploaded by the vector network analyzer within one steam release period, and arranges the data uploaded by the vector network analyzer into an array according to the steam release period. The data in the same steam release period is divided into an array. The host computer calculates the steam saturation of the steam released in each steam release period after the end of each steam release period, to realize real-time online monitoring of the steam saturation. Then continue to wait for the IO operation, and wait for the steam release of the next steam release period.

[0106] Further, for the correlation operation of each array and the calibration data, according to the above formula 1-2, the steam humidity is calculated according to the initialization parameters, the resonance frequency, the dielectric constant and the steam temperature under the steam disturbance, and the steam saturation is further calculated according to the steam humidity.

[0107] Optionally, the calibration data can also include a saturation threshold. The calculated steam saturation is compared with the saturation threshold. If the calculated steam saturation is greater than the saturation threshold, the resonance frequency, dielectric constant and calculated steam saturation detected by the vector network analyzer are archived. If the calculated steam saturation is less than or equal to the saturation threshold, a warning prompt information of the steam saturation is generated and output.

[0108] In an embodiment, the generated warning prompt information of the steam saturation can be output to the steam ablation host computer for display to the user. In the case of insufficient steam saturation, the warning prompt can help the user to understand the energy situation of the steam release in time during the steam ablation process, so as to accurately evaluate the ablation treatment effect.

[0109] After the steam saturation is warned, the warning information, resonant frequency, dielectric constant, steam saturation and other related data are archived.

[0110] The original data detected by the vector network analyzer and the calculated data obtained by analyzing the original data are archived to facilitate subsequent tracking and analysis of the steam ablation process.

[0111] In this embodiment, the embedded microwave resonant cavity is respectively connected to the steam generating component and the steam transmission pipe of the steam ablation device. As part of the steam transmission pipeline, during the steam ablation process, the steam passes through the microwave resonant cavity, causing a tiny disturbance to the microwave resonant cavity. The vector network analyzer connected to the microwave resonant cavity can detect the resonant frequency and dielectric constant of the microwave resonant cavity in real time. The upper computer analyzes the data detected by the vector network analyzer to determine the steam saturation of the steam ablation device, thereby realizing real-time online monitoring of the steam saturation based on the microwave resonant cavity perturbation technology, so that users of the steam ablation device can understand the ablation treatment situation in a timely manner.

[0112] Furthermore, by providing an early warning when steam saturation is insufficient, users of the steam ablation device can accurately assess the effectiveness of ablation therapy. Furthermore, by archiving the raw data detected by the vector network analyzer and the calculated data analyzed by the host computer, the steam ablation process of the steam ablation device can be tracked and analyzed.

[0113] The embodiment of the present invention further provides a steam saturation test system based on microwave resonant cavity perturbation technology, which is used to implement the steam saturation test method based on microwave resonant cavity perturbation technology as described in the above embodiments. Figure 2 As shown, the steam saturation test system based on microwave resonant cavity perturbation technology provided by the embodiment of the present invention includes a host computer, a vector network analyzer and a microwave resonant cavity. The host computer, the vector network analyzer and the microwave resonant cavity can be connected in sequence, wherein: The microwave resonant cavity is embedded in a steam delivery pipeline of a steam ablation device. During the steam ablation process of the steam ablation device, the steam entering the microwave resonant cavity causes disturbance to the microwave resonant cavity. The vector network analyzer is used to detect the resonant frequency and dielectric constant of the microwave resonant cavity under steam disturbance; The host computer is used to analyze the resonant frequency and the dielectric constant to determine the steam saturation of the steam ablation device.

[0114] As an embodiment, the steam saturation testing system based on microwave cavity perturbation technology may also include a steam ablation device and a steam ablation host corresponding to the steam ablation device, wherein the host computer and the vector network analyzer are deployed in the steam ablation host of the steam ablation device.

[0115] The steam saturation testing system based on microwave cavity perturbation technology provided in this embodiment can be cross-referenced with the description of the steam saturation testing method based on microwave cavity perturbation technology described in the above embodiments, and will not be repeated here.

[0116] In this embodiment, a steam saturation testing system based on microwave cavity perturbation technology is used to perform real-time online monitoring of the steam released by the steam ablation device during the ablation process, thereby realizing real-time online measurement of the steam saturation used for ablation and improving the detection accuracy of the steam saturation.

[0117] In addition, the microwave resonant cavity is embedded in the steam delivery pipeline of the steam ablation equipment. As a part of the steam delivery pipeline, it can avoid introducing adverse factors that affect the ablation process during the test of steam saturation, while eliminating the influence of environmental factors and ensuring the accuracy of the test results.

[0118] An embodiment of the present invention further provides a steam ablation device, which measures steam saturation during steam ablation using the steam saturation testing method based on microwave cavity perturbation technology as described in the above embodiments.

[0119] That is, the steam ablation device provided in the embodiment of the present invention can adopt the steam saturation testing method based on microwave cavity perturbation technology as described in the above embodiments to achieve real-time online monitoring of the saturation of the steam released during the ablation process.

[0120] Accordingly, the steam ablation device provided in the embodiment of the present invention can be applied to the steam saturation testing system based on microwave cavity perturbation technology as described in the above embodiments to achieve real-time online monitoring of the saturation of the steam released during the ablation process.

[0121] The steam ablation device provided in the embodiment of the present invention can be cross-referenced with the steam saturation test method and system based on microwave cavity perturbation technology described in the above embodiments, and will not be described in detail here.

[0122] Figure 8 An example of a physical structure diagram of an electronic device is shown below. Figure 8As shown, the electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840. The processor 810, the communications interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call logic instructions in the memory 830 to execute the steps of the steam saturation test method based on the microwave cavity perturbation technology, for example, including: receiving a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by the vector network analyzer by detecting a microwave resonant cavity during steam ablation by a steam ablation device; the microwave resonant cavity is embedded in a steam delivery pipeline of the steam ablation device, and the steam entering the microwave resonant cavity causes a disturbance to the microwave resonant cavity; The resonant frequency and the dielectric constant are analyzed to determine the vapor saturation of the vapor ablation device.

[0123] Furthermore, the logic instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0124] On the other hand, the present invention further provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can perform the steps of the steam saturation test method based on the microwave cavity perturbation technology provided by the above methods, for example, including: receiving a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by the vector network analyzer by detecting a microwave resonant cavity during steam ablation by a steam ablation device; the microwave resonant cavity is embedded in a steam delivery pipeline of the steam ablation device, and the steam entering the microwave resonant cavity causes a disturbance to the microwave resonant cavity; The resonant frequency and the dielectric constant are analyzed to determine the vapor saturation of the vapor ablation device.

[0125] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the steam saturation test method based on microwave cavity perturbation technology provided by the above methods are implemented, for example, including: receiving a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by the vector network analyzer by detecting a microwave resonant cavity during steam ablation by a steam ablation device; the microwave resonant cavity is embedded in a steam delivery pipeline of the steam ablation device, and the steam entering the microwave resonant cavity causes a disturbance to the microwave resonant cavity; The resonant frequency and the dielectric constant are analyzed to determine the vapor saturation of the vapor ablation device.

[0126] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0127] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0128] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A steam saturation test method based on microwave cavity perturbation technology, characterized in that: include: receiving a resonant frequency and a dielectric constant uploaded by a vector network analyzer; the resonant frequency and the dielectric constant are obtained by the vector network analyzer by detecting a microwave resonant cavity during steam ablation by a steam ablation device; the microwave resonant cavity is embedded in a steam delivery pipeline of the steam ablation device, and the steam entering the microwave resonant cavity causes a disturbance to the microwave resonant cavity; The resonant frequency and the dielectric constant are analyzed to determine the vapor saturation of the vapor ablation device.

2. The steam saturation test method based on microwave cavity perturbation technology according to claim 1 is characterized in that: Before receiving the resonant frequency and dielectric constant uploaded by the vector network analyzer, the method further includes: generating a first drive signal after power-on initialization, and sending the first drive signal to the vector network analyzer; The vector network analyzer is driven by the first driving signal to detect initialization parameters of the microwave resonant cavity; the initialization parameters include an initial resonant frequency.

3. The steam saturation test method based on microwave cavity perturbation technology according to claim 2 is characterized in that: The analyzing the resonant frequency and the dielectric constant to determine the vapor saturation of the vapor ablation device includes: Calibrate a sensitivity coefficient based on the initial resonant frequency and the dielectric constant; the sensitivity coefficient is used to characterize the sensitivity of the resonant frequency change to humidity; determining a frequency offset according to the resonant frequency and the initial resonant frequency; The steam humidity in the microwave resonance cavity is calculated based on the sensitivity coefficient and the frequency offset, and the steam saturation of the steam ablation device is determined based on the steam humidity.

4. The steam saturation test method based on microwave cavity perturbation technology according to claim 3 is characterized in that: The initialization parameters also include initial temperature; The steam humidity is calculated as follows: Steam humidity = ; in, is the sensitivity coefficient, is the frequency offset, is the temperature compensation coefficient, is the steam temperature, is the initial temperature in the microwave resonant cavity; the steam temperature It is obtained by detecting the microwave resonant cavity with the vector network analyzer.

5. The steam saturation test method based on microwave cavity perturbation technology according to claim 3 is characterized in that: The sensitivity coefficient is calculated as follows: ； in, represents the cavity volume of the microwave resonant cavity, represents the effective volume occupied by steam in the microwave resonant cavity, is the initial resonant frequency, is the real part of the dielectric constant; and It is obtained through calibration.

6. The steam saturation test method based on microwave cavity perturbation technology according to claim 1 is characterized in that: Before receiving the resonant frequency and dielectric constant uploaded by the vector network analyzer, the method further includes: generating a second driving signal when a steam start signal of the steam ablation device is detected; wherein the steam start signal is used to drive a steam generating component of the steam ablation device to generate steam; The second driving signal is sent to the vector network analyzer; driven by the second driving signal, the vector network analyzer detects the resonant frequency and dielectric constant of the microwave cavity under steam disturbance at a preset frequency until a driving stop signal is received; the driving stop signal is generated when a steam shutdown signal of the steam ablation device is detected; the steam shutdown signal is used to control the steam generating component to stop operating.

7. The method for testing steam saturation based on microwave cavity perturbation technology according to claim 6, characterized in that: The sending the second driving signal to the vector network analyzer includes: Generate a timing task corresponding to the second driving signal; the timing task corresponds to a preset delay duration; When the delay time corresponding to the timing task is reached, the second driving signal is sent to the vector network analyzer.

8. The steam saturation test method based on microwave cavity perturbation technology according to claim 1 is characterized in that: After analyzing the resonant frequency and the dielectric constant to determine the vapor saturation of the vapor ablation device, the method further includes: archiving the resonant frequency, the dielectric constant, and the vapor saturation; The steam saturation is compared with a calibrated saturation threshold, and when the steam saturation is less than or equal to the saturation threshold, early warning prompt information on the steam saturation is generated and output.

9. The steam saturation test method based on microwave cavity perturbation technology according to any one of claims 1 to 8, characterized in that: The microwave resonant cavity is provided with a steam inlet at one end and a steam outlet at the other end; the steam delivery pipeline includes a steam generating assembly and a steam delivery pipe, the steam inlet is connected to the steam generating assembly, and the steam outlet is connected to the steam delivery pipe; The steam generated by the steam generating assembly enters the microwave resonance cavity through the steam inlet, then enters the steam delivery pipe through the steam outlet, and is delivered to the tissue to be ablated via the steam delivery pipe.

10. The steam saturation test method based on microwave cavity perturbation technology according to claim 9, characterized in that: The vector network analyzer includes an input connection line and an output connection line, wherein the input connection line is connected to the port of the steam inlet, and the output connection line is connected to the port of the steam outlet.

11. A steam saturation test system based on microwave cavity perturbation technology, characterized in that: Including host computer, vector network analyzer and microwave resonant cavity: The microwave resonant cavity is embedded in a steam delivery pipeline of a steam ablation device. During the steam ablation process of the steam ablation device, the steam entering the microwave resonant cavity causes disturbance to the microwave resonant cavity. The vector network analyzer is used to detect the resonant frequency and dielectric constant of the microwave resonant cavity under steam disturbance; The host computer is used to analyze the resonant frequency and the dielectric constant to determine the steam saturation of the steam ablation device.

12. The steam saturation test system based on microwave cavity perturbation technology according to claim 11, characterized in that: The host computer and the vector network analyzer are deployed in the steam ablation host of the steam ablation device.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steam saturation testing method based on microwave cavity perturbation technology according to any one of claims 1 to 10 is implemented.

14. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steam saturation testing method based on microwave cavity perturbation technology according to any one of claims 1 to 10 is implemented.

15. A steam ablation device, characterized in that: During steam ablation, the steam ablation device measures steam saturation using the steam saturation testing method based on microwave cavity perturbation technology as described in any one of claims 1 to 10.

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