Steam ablation pressure detection system and steam ablation equipment

Abstract

The invention provides a steam ablation pressure detection system and steam ablation equipment, and relates to the technical field of steam ablation, the system comprises a pressure detection sensor and a central processor, the pressure detection sensor comprises a flexible pressure sensor and a signal processing circuit, the flexible pressure sensor is arranged in a gap between the injector assembly and the fixing part, the gap is matched with the moving direction of the injector assembly, the injector assembly is arranged on the fixing part, and the flexible pressure sensor is used for detecting the pressure of the injector assembly under the condition that the injector assembly extrudes the flexible pressure sensor when filling the fluid pipeline. Determining a resistance signal corresponding to the flexible pressure sensor in the gap; the signal processing circuit is respectively connected with the flexible pressure sensor and the central processor, and the signal processing circuit is used for determining an analog output signal based on the resistance signal; the central processor is used for determining a pressure detection result corresponding to the fluid pipeline based on the analog output signal. The fault rate of the pressure detection sensor can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steam ablation, and in particular to a steam ablation pressure detection system and a steam ablation device. Background Art

[0002] At present, in the field of medical devices, the method of using steam ablation equipment to generate water vapor to treat diseased tissues or cells has been clinically applied. In steam ablation equipment, blockage of fluid pipelines is a common and significant fault. Therefore, how to effectively detect whether the pipeline is blocked is an urgent problem to be solved.

[0003] In the prior art, a pressure sensor or a flow sensor is generally connected in series in the fluid pipeline as a pressure detection sensor. The steam ablation device can obtain the pressure value in the pressure sensor in real time, and judge whether the pipe is blocked based on the comparison result with the preset threshold value, or the steam ablation device can detect the flow rate or flow velocity in the fluid pipeline in real time through the flow sensor to judge whether the pipe is blocked.

[0004] However, the above-mentioned pressure detection sensor needs to be connected in series in a fluid pipeline. When the water in the fluid pipeline flows through the pressure detection sensor, if there are impurities in the water, the impurities will be retained in the pressure detection sensor, resulting in a high failure rate of the pressure detection sensor. Summary of the invention

[0005] The present invention provides a steam ablation pressure detection system and a steam ablation device, which are used to solve the defect of high failure rate of pressure detection sensors in the prior art and greatly reduce the failure rate of the pressure detection sensors.

[0006] The present invention provides a steam ablation pressure detection system, comprising: a pressure detection sensor and a central processing unit, wherein: The pressure detection sensor comprises a flexible pressure sensor and a signal processing circuit, wherein the flexible pressure sensor is arranged in a gap between the syringe assembly and the fixing member, wherein the gap matches the moving direction of the syringe assembly, and the syringe assembly is arranged on the fixing member, and the flexible pressure sensor is used to determine a resistance signal corresponding to the flexible pressure sensor in the gap when the syringe assembly squeezes the flexible pressure sensor when perfusing the fluid pipeline; the signal processing circuit is respectively connected to the flexible pressure sensor and the central processor, and the signal processing circuit is used to determine an analog output signal based on the resistance signal; The central processing unit is used to determine the pressure detection result corresponding to the fluid pipeline based on the analog output signal.

[0007] According to the steam ablation pressure detection system provided by the present invention, the flexible pressure sensor is specifically used for: When the flexible pressure sensor is squeezed when the syringe assembly is infusing the fluid pipeline, a resistance signal corresponding to the target squeezing force borne by the flexible pressure sensor is determined based on a preset mapping relationship. The preset mapping relationship is used to characterize the linear mapping relationship between the squeezing force corresponding to the flexible pressure sensor and the resistance signal within a preset pressure range.

[0008] According to the steam ablation pressure detection system provided by the present invention, the flexible pressure sensor includes a flexible electrode and conductive silicone, wherein: The flexible electrode comprises a first electrode assembly and a second electrode assembly which are not in contact with each other, wherein the first ends of the first electrode assembly and the second electrode assembly respectively correspond to a forked region; the second end of the first electrode assembly is connected to the first input end of the signal processing circuit, and the second end of the second electrode assembly is connected to the second input end of the signal processing circuit; The conductive silicone is arranged on the interdigital area, and is used to conduct the first electrode assembly and the second electrode assembly when the syringe assembly squeezes the conductive silicone when infusing the fluid pipeline, and based on the preset mapping relationship, determine the resistance signal corresponding to the target extrusion force that the conductive silicone bears, and send the resistance signal to the signal processing circuit based on the second ends corresponding to each of the first electrode assembly and the second electrode assembly.

[0009] According to the steam ablation pressure detection system provided by the present invention, the conductive silicone rubber is fluorine-containing conductive silicone rubber.

[0010] According to the steam ablation pressure detection system provided by the present invention, the signal processing circuit includes a signal conversion circuit and an analog output circuit, wherein: The first input end of the signal conversion circuit serves as the first input end of the signal processing circuit, the second input end of the signal conversion circuit serves as the second input end of the signal processing circuit, and the output end of the signal conversion circuit is connected to the input end of the analog output circuit; the signal conversion circuit is used to convert the resistance signal into a detection signal; The output end of the analog output circuit is connected to the input end of the central processing unit, and the analog output signal is used to determine the analog output signal based on the detection signal.

[0011] According to the steam ablation pressure detection system provided by the present invention, the analog output circuit includes a power amplifier circuit or a logic operation circuit, and the analog output signal includes an analog amplified signal or a pressure detection signal, wherein: The input end of the power amplifier circuit serves as the input end of the analog output circuit, the output end of the power amplifier circuit is connected to the input end of the central processing unit, and the power amplifier circuit is used to amplify the power of the detection signal, determine the analog amplified signal, and send the analog amplified signal to the central processing unit; The first input end of the logic operation circuit serves as the input end of the analog output circuit, and the output end of the logic operation circuit is connected to the input end of the central processing unit. The logic operation circuit is used to compare the voltage value corresponding to the detection signal with a preset threshold analog signal, determine the pressure detection signal based on the comparison result, and send the pressure detection signal to the central processing unit.

[0012] According to the steam ablation pressure detection system provided by the present invention, the power amplifier circuit includes an amplifier circuit and a transient voltage suppressor tube TVS, wherein: The input end of the amplifier circuit serves as the input end of the power amplifier circuit, the output end of the amplifier circuit is connected to one end of the TVS, the other end of the TVS is connected to the negative pole of the power supply, and the output end of the amplifier circuit serves as the output end of the power amplifier circuit.

[0013] According to the steam ablation pressure detection system provided by the present invention, the logic operation circuit includes a digital-to-analog converter, a comparator, a switch tube and a pull-up resistor, wherein: The input end of the digital-to-analog converter is connected to the output end of the central processing unit, and the output end of the digital-to-analog converter is connected to the inverting input end of the comparator. The digital-to-analog converter is used to perform digital-to-analog conversion on the preset threshold signal sent by the central processing unit, determine the preset threshold analog signal, and send the preset threshold analog signal to the inverting input end of the comparator; The non-inverting input terminal of the comparator serves as the first input terminal of the logic operation circuit, the non-inverting input terminal of the comparator is used to receive the detection signal, the inverting input terminal of the comparator is used to receive the preset threshold analog signal, the output terminal of the comparator is connected to the first terminal of the switch tube, the comparator is used to compare the detection signal with the preset threshold analog signal to determine the comparison signal; the comparison signal is used to control the on-off state of the switch tube to determine the pressure detection signal; The second end of the switch tube is connected to the negative pole of the power supply, the third end of the switch tube is connected to one end of the pull-up resistor, the other end of the pull-up resistor is connected to the mainboard power supply and serves as the output end of the logic operation circuit.

[0014] According to the steam ablation pressure detection system provided by the present invention, when the analog output circuit includes a power amplifier circuit, the central processor is used to convert the analog amplified signal into a digital amplified signal, and determine the pressure detection result corresponding to the fluid pipeline based on the comparison result between the digital amplified signal and a preset threshold signal; In the case where the analog output circuit includes a logic operation circuit, the central processing unit is used to determine the pressure detection result corresponding to the fluid pipeline based on the level state of the pressure detection signal.

[0015] The present invention also provides a steam ablation device, comprising an injector assembly, a fixing, a fluid pipeline and a steam ablation pressure detection system as described in any one of the above items, wherein the injector assembly is arranged on the fixing, and the injector assembly is connected to the fluid pipeline.

[0016] The steam ablation pressure detection system and steam ablation device provided by the present invention change the force measurement principle of the pressure detection sensor when performing pressure detection by arranging a flexible pressure sensor in the gap between the syringe assembly and the fixing part that matches the moving direction of the syringe assembly, that is, the squeezing force on the flexible pressure sensor caused by the relative movement between the syringe assembly and the fixing part during the infusion process is measured by the flexible pressure sensor, and the squeezing force is converted into a resistance signal, and then the resistance signal is sent to the signal processing circuit in the pressure detection sensor, the signal processing circuit determines the analog output signal according to the resistance signal, and transmits the analog output signal to the central processing unit, and the central processing unit determines the pressure detection result corresponding to the fluid pipeline according to the analog output signal. The present invention avoids direct contact between the pressure detection sensor and the water flow in the fluid pipeline by changing the installation position of the pressure detection sensor, thereby greatly reducing the failure rate of the pressure detection sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces 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 creative work.

[0018] Figure 1 It is a structural schematic diagram of a steam ablation pressure detection system provided in an embodiment of the present invention.

[0019] Figure 2 It is a scatter plot corresponding to the calibration data provided by the embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of a regression equation provided by an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of a new linear regression equation corresponding to the first correction method provided in an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of a new linear regression equation corresponding to the second correction method provided in an embodiment of the present invention.

[0023] Figure 6 It is a schematic diagram of a new linear regression equation corresponding to the third correction method provided in an embodiment of the present invention.

[0024] Figure 7 This is one of the structural schematic diagrams of the flexible pressure sensor provided in an embodiment of the present invention.

[0025] Figure 8 This is the second structural schematic diagram of the flexible pressure sensor provided in an embodiment of the present invention.

[0026] Fig. 9 It is a schematic diagram of the structure of a signal processing circuit provided by an embodiment of the present invention.

[0027] Fig.10 Schematic diagram of a bridge conversion circuit provided by an embodiment of the present invention.

[0028] Fig.11 Schematic diagram of a logic operation circuit provided by an embodiment of the present invention.

[0029] Fig.12 It is a flow chart of the pressure detection method provided by an embodiment of the present invention.

[0030] Reference numerals: 100: pressure detection sensor; 110: flexible pressure sensor; 111: flexible electrode; 112: conductive silicone; 113: protective film; 120: signal processing circuit; 121: signal conversion circuit; 1211: bridge conversion circuit; 1212: signal amplification circuit; 122: analog output circuit; 1221: power amplification circuit; 1222: logic operation circuit; 1223: digital-to-analog converter; 200: central processing unit; 300: syringe assembly; 400: fixing part; 500: fluid pipeline. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In view of the high failure rate of the pressure detection sensor 100 in the prior art, an embodiment of the present invention provides a steam ablation pressure detection system. Figure 1 is a structural diagram of a steam ablation pressure detection system provided by an embodiment of the present invention. Figure 1 As shown, the steam ablation pressure detection system includes: a pressure detection sensor 100 and a central processing unit 200.

[0033] The pressure detection sensor 100 includes a flexible pressure sensor 110 and a signal processing circuit 120. The flexible pressure sensor 110 is arranged in a gap between the syringe assembly 300 and the fixing member 400. The gap matches the moving direction of the syringe assembly 300. The syringe assembly 300 is arranged on the fixing member 400. The flexible pressure sensor 110 is used to determine the resistance signal corresponding to the flexible pressure sensor 110 in the gap when the flexible pressure sensor 110 is squeezed when the syringe assembly 300 is infusing the fluid pipeline 500. The signal processing circuit 120 is respectively connected to the flexible pressure sensor 110 and the central processor 200. The signal processing circuit 120 is used to determine the analog output signal based on the resistance signal.

[0034] The central processor 200 is used to determine the pressure detection result corresponding to the fluid pipeline 500 based on the analog output signal.

[0035] Specifically, in the embodiment of the present invention, the pressure detection sensor 100 is divided into two parts: a flexible pressure sensor 110 and a signal processing circuit 120. A gap is provided between the syringe assembly 300 and the fixing member 400, and at a position matching the moving direction of the syringe assembly 300, and the flexible pressure sensor 110 is provided in the gap. When the syringe assembly 300 is pushed to move in the direction of the fluid pipeline 500 and water is poured into the fluid pipeline 500, the relative movement between the syringe assembly 300 and the fixing member 400 will generate force conduction, that is, when the position of the fixing member 400 remains unchanged, the syringe assembly 300 is pushed to squeeze the flexible pressure sensor 110 in the gap. Since the resistance of the flexible pressure sensor 110 itself changes with the change of the target squeezing force, the flexible pressure sensor 110 can generate a corresponding resistance signal after being squeezed, and the resistance signal is the resistance value exhibited by the flexible pressure sensor 110 after being squeezed by the target squeezing force. After the flexible pressure sensor 110 determines the resistance signal, the resistance signal is sent to the signal processing circuit 120, and the resistance signal is converted into an analog output signal by the signal processing circuit 120. The analog output signal can be a voltage signal corresponding to the resistance signal, and the analog output signal is subjected to signal processing operations including signal amplification, signal shaping, and impedance matching. After the analog output signal is sent to the central processor 200, the detection accuracy and reliability of the central processor 200 performing pressure detection according to the analog output signal are improved.

[0036] For example, Figure 1 As shown, when the internal piston of the syringe assembly 300 pushes the syringe assembly 300 in the direction of the fluid pipeline 500, the syringe assembly 300 moves relative to the fixed fixture 400, and the direction of the relative movement is horizontally toward the fluid pipeline. At this time, a gap can be set between the syringe assembly 300 and the fixture 400, and perpendicular to the position in the horizontal direction toward the fluid pipeline 500, so that the corresponding relative movement of the syringe assembly 300 can squeeze the flexible pressure sensor 110 in the gap to generate force conduction.

[0037] It should be noted that the deformation amount corresponding to the flexible pressure sensor 110 is related to the blocking state of the fluid pipeline 500. For example, if the fluid pipeline 500 is not blocked, since the passage between the syringe assembly 300 and the fluid pipeline 500 is connected, the water flow in the syringe assembly 300 is smoothly poured into the fluid pipeline 500, the internal pressure of the syringe assembly 300 is small, and the target extrusion force on the flexible pressure sensor 110 is small. Therefore, the deformation amount of the syringe assembly 300 squeezing the flexible pressure sensor 110 is small. If the fluid pipeline 500 is blocked, since the passage between the syringe assembly 300 and the fluid pipeline 500 is blocked, when the syringe assembly 300 is continuously pushed to move in the direction of the fluid pipeline 500, the thrust increases with the increase of the internal pressure of the syringe assembly 300, thereby increasing the target extrusion force on the flexible pressure sensor 110, so that the deformation amount of the syringe assembly 300 squeezing the flexible pressure sensor 110 increases.

[0038] It should be noted that if Figure 1 As shown, the fluid conduit 500 is connected to the injection port Z at the front end of the syringe assembly 300 , and the fluid conduit 500 forms a passage with the syringe assembly 300 through the injection port Z. In the prior art, the pressure detection sensor 100 is disposed in the fluid conduit 500 .

[0039] Optionally, the fluid injected into the fluid pipeline 500 may include sterile water or a mixed medium with added drugs, which is not limited in this embodiment of the present invention.

[0040] In the embodiment of the present invention, firstly, by changing the installation position of the flexible pressure sensor 110, direct contact between the pressure detection sensor 100 and the water flow is avoided, that is, the accumulation of impurities in the pressure detection sensor 100 is avoided to cause a high failure rate. Compared with the prior art in which the pressure detection sensor 100 is connected in series in the fluid pipeline 500 and connected to the central processor 200 and other components in the steam ablation device through a cable, the installation complexity and wiring complexity of the flexible pressure sensor 110 in the embodiment of the present invention are much lower than the prior art. Secondly, when performing pressure detection, the force transmission and squeezing of the flexible pressure sensor 110 generated when the syringe assembly 300 moves is used instead of directly measuring the pressure of the water flow in the prior art. By changing the force measurement principle, the influence of the water flow velocity, impurities and bubbles in the water flow on the measurement results of the pressure detection sensor 100 is avoided, thereby improving the accuracy and reliability of pressure detection.

[0041] Furthermore, the flexible pressure sensor 110 is specifically used for: When the syringe assembly 300 squeezes the flexible pressure sensor 110 when injecting into the fluid pipeline 500, a resistance signal corresponding to the target squeezing force borne by the flexible pressure sensor 110 is determined based on a preset mapping relationship. The preset mapping relationship is used to characterize the linear mapping relationship between the squeezing force corresponding to the flexible pressure sensor 110 and the resistance signal within a preset pressure range.

[0042] Specifically, since there is a linear mapping relationship between the extrusion force borne by the flexible pressure sensor 110 and the resistance signal when the extrusion force exerted on the flexible pressure sensor 110 is within the preset pressure range, the preset mapping relationship corresponding to the flexible pressure sensor 110 can be predetermined before pressure detection. That is, different extrusion forces are applied to the flexible pressure sensor 110, and the resistance values ​​of the flexible pressure sensor 110 under different extrusion forces are measured to obtain multiple sets of calibration data. Afterwards, the preset mapping relationship can be obtained by fitting the multiple sets of calibration data, in which pressure is used as the independent variable and resistance is used as the dependent variable. When the preset mapping relationship is determined and the flexible pressure sensor 110 is subjected to the target extrusion force, the flexible pressure sensor 110 can automatically convert the target extrusion force into a corresponding resistance signal according to the preset mapping relationship.

[0043] For example, taking multiple groups of calibration data as shown in Table 1 as an example, determining the preset mapping relationship includes the following steps.

[0044] (1) As can be seen from Table 1, the corresponding resistance value changes are very small when the extrusion pressure is 6.0N and 8.7N. It may be that the deformation of the flexible pressure sensor 110 has reached the limit when the extrusion pressure is 8.7N. Therefore, the calibration data when the extrusion pressure is 8.7N is removed, and the calibration data when the extrusion pressure is 0N is also removed. Then, a scatter plot corresponding to the remaining calibration data is drawn in Excel. The scatter plot is as follows: Figure 2 As shown in the figure, the horizontal axis of the scatter plot represents the extrusion pressure, and the vertical axis represents the resistance value corresponding to the extrusion pressure.

[0045] (2) Use Excel to perform least squares analysis on the remaining calibration data in the scatter plot and obtain the following fitting results: Figure 3 The regression equation is shown in Where R represents the resistance value and F represents the extrusion force. Figure 3 It can be seen that the correlation coefficient square R of the fitted regression equation 2 It reaches 0.9869. It should be noted that the square of the correlation coefficient R 2 The closer it is to 1, the higher the linearity of the regression equation. , it can be considered to be a linear relationship. Figure 3 The square of the correlation coefficient R of the regression equation obtained by fitting 2is 0.9869, which is greater than the engineering threshold of 0.95, so the regression equation is a linear regression equation. That is, within the preset pressure range, there is a linear relationship between the resistance value of the flexible pressure sensor 110 and the extrusion force, thereby ensuring the feasibility of using the flexible pressure sensor 110 for pressure detection in the embodiment of the present invention.

[0046] (3) After fitting the linear regression equation, Figure 3 It can be seen that the corresponding resistance value is 43.8 when the extrusion pressure is 1.1N The corresponding resistance value when the extrusion force is 6.0N is 17.8 The deviation from the linear regression equation is large, so the linear regression equation needs to be further corrected. At this time, there are three methods to correct the linear regression equation. The first method is to remove only the calibration data when the extrusion pressure is 1.1N from the remaining calibration data; the second method is to remove only the calibration data when the extrusion pressure is 6.0N; the third method is to remove the calibration data corresponding to the extrusion pressure of 1.1N and the extrusion pressure of 6.0N at the same time. The three sets of new calibration data are fitted by the least squares method respectively, and the new linear fitting equation corresponding to the first method is obtained as follows: Figure 4 As shown, the new linear fitting equation is , and the square of the correlation coefficient is 0.9857; the corresponding new linear fitting equation for the second type is Figure 5 As shown, the new linear fitting equation is , and the square of the correlation coefficient is 0.9945; the new linear fitting equation corresponding to the third type is as follows Figure 6 As shown, the new linear fitting equation is , and the square of the correlation coefficient is 0.994. Therefore, the second corresponding new linear fitting equation is determined as the preset mapping relationship corresponding to the flexible pressure sensor 110, and the measuring range corresponding to the flexible pressure sensor 110 is determined to be between 1N and 5N.

[0047] Table 1 Calibration data

[0048] Optionally, when determining multiple sets of calibration data, a force measuring device such as a dynamometer can be used to directly measure the extrusion pressure applied to the flexible pressure sensor 110. The weight, tension, bending force, etc. can also be converted into extrusion pressure through mathematical or physical methods to achieve indirect measurement of the extrusion pressure of the flexible pressure sensor 110. The embodiment of the present invention is not limited to this.

[0049] Further, Figure 7 is one of the structural schematic diagrams of the flexible pressure sensor provided by an embodiment of the present invention, such as Figure 7 As shown, the flexible pressure sensor 110 includes a flexible electrode 111 and a conductive silicone 112, wherein: The flexible electrode 111 includes a first electrode assembly A and a second electrode assembly B that are not in contact with each other, and the first ends of the first electrode assembly A and the second electrode assembly B respectively form an interdigitated region; the second end of the first electrode assembly A is connected to the first input end of the signal processing circuit 120, and the second end of the second electrode assembly B is connected to the second input end of the signal processing circuit 120; The conductive silicone 112 is arranged on the interdigital area. The conductive silicone 112 is used to conduct the first electrode assembly A and the second electrode assembly B when the conductive silicone 112 is squeezed when the syringe assembly 300 is infusing the fluid pipeline 500, and based on the preset mapping relationship, determine the resistance signal corresponding to the target squeezing force that the conductive silicone 112 is subjected to, and based on the second ends corresponding to each of the first electrode assembly A and the second electrode assembly B, send the resistance signal to the signal processing circuit 120.

[0050] Specifically, in the flexible pressure sensor 110, the first electrode assembly A and the second electrode assembly B that do not contact each other constitute a flexible electrode 111, and the first ends corresponding to the first electrode assembly A and the second electrode assembly B are respectively serrated and interlaced to form interlaced finger regions that do not contact each other. The conductive silicone 112 is arranged on the interlaced finger regions. The conductive silicone 112 can be understood as a variable resistor arranged between the first electrode assembly A and the second electrode assembly B, so that the resistance between the second ends corresponding to the first electrode assembly A and the second electrode assembly B changes with the change of the extrusion force borne by the conductive silicone 112, that is, the resistance detected at the second ends corresponding to the first electrode assembly A and the second electrode assembly B is the resistance of the conductive silicone 112. For example, when the syringe assembly 300 does not inject water into the fluid pipeline 500, the resistance of the conductive silicone 112 is relatively large, which is equivalent to the path between the first electrode assembly A and the second electrode assembly B being disconnected; after the syringe assembly 300 squeezes the conductive silicone 112 when injecting water into the fluid pipeline 500, the extrusion force on the conductive silicone 112 increases, so that the resistance of the conductive silicone 112 itself is greatly reduced, which is equivalent to the path between the first electrode assembly A and the second electrode assembly B being connected, and the target extrusion force on the conductive silicone 112 is converted into a corresponding resistance signal based on the preset mapping relationship, and transmitted to the first electrode assembly A and the second assembly respectively corresponding second end. After the conductive silicone 112 converts the target extrusion force it receives into a corresponding resistance signal and transmits it to the first electrode assembly A and the second assembly respectively corresponding second end, based on the connection between the first electrode assembly A and the second assembly respectively corresponding second end and the signal processing circuit 120, the resistance signal can be sent to the signal processing circuit 120 to determine the analog output signal.

[0051] It should be noted that the conductive properties of the conductive silicone 112 are achieved by adding reinforcing agents, conductive additives and structural inhibitors to the silicone during vulcanization. The resistivity of the conductive silicone 112 is generally 3 to 10 ·cm, relative density of 1.15, hardness (Shore A) of 60, tensile strength of 5.7MPa, relative elongation of 265%, etc., with excellent physical and mechanical properties. When subjected to extrusion force, the length, cross-sectional area and thickness of the conductive silicone 112 will be deformed, causing the resistance of the conductive silicone 112 itself to change. Generally, the greater the extrusion force, the greater the deformation, the greater the change in resistance, and the smaller the resistance after the change. That is, the magnitude of the extrusion force can be inferred through the change in resistance.

[0052] Optionally, when determining multiple sets of calibration data, a multimeter, an ohmmeter or an LCR (LnductanceCapacitanceResistance) digital bridge can be used to directly measure the resistance between the second ends corresponding to the first electrode assembly A and the second electrode assembly B. The resistance can also be converted into parameters such as voltage, current, frequency or phase to indirectly measure the resistance between the second ends corresponding to the first electrode assembly A and the second electrode assembly B. For example, a 555 timer is used to measure the frequency to indirectly measure the resistance after the frequency conversion; an analog multiplier, mixer, integrator or differentiator is used to measure the phase to indirectly measure the resistance after the phase conversion. The embodiments of the present invention are not limited to this.

[0053] Furthermore, the conductive silicone 112 is made of fluorine-containing conductive silicone 112 .

[0054] Specifically, in the prior art, the range of the pressure detection sensor 100 connected in series in the fluid pipeline 500 is relatively small, while the steam pressure of the steam ablation equipment is very large, which can break through the tissue gap to ablate the diseased tissue and cells. If the tube is blocked, the pressure will increase exponentially. The use of over-range can also easily cause the pressure detection sensor 100 to malfunction. If ordinary conductive silicone 112 is used, the range of the pressure detection sensor 100 can be between 1N and 5N. This range is relatively small, has a large creep and a small resistance, and cannot meet the pressure detection requirements. Therefore, in an embodiment of the present invention, a preset content of fluorine element is added to the conductive silicone 112 by a special process, and the conductive silicone 112 is converted into a fluorine-containing conductive silicone 112, so that the resistance of the fluorine-containing conductive silicone 112 can reach 1000. As described above, the power loss of the pressure detection sensor 100 is greatly reduced, and the elasticity, corrosion resistance and pressure resistance of the fluorine-containing conductive silicone 112 are several orders of magnitude stronger than those of ordinary conductive silicone 112, thereby greatly improving the measuring range, greatly reducing the creep value, and greatly extending the service life.

[0055] also, Figure 8 FIG. 2 is a second structural diagram of a flexible pressure sensor provided by an embodiment of the present invention. Figure 8 As shown, the flexible pressure sensor 110 also includes a protective film 113, which wraps the flexible electrode 111 and the conductive silicone 112, thereby protecting the flexible electrode 111 and the conductive silicone 112 and avoiding false detection due to accumulation of conductive medium between the first electrode component A and the second electrode component B in the flexible electrode 111, thereby affecting the reliability and accuracy of the pressure detection result.

[0056] Further, Fig. 9 is a schematic diagram of the structure of a signal processing circuit provided by an embodiment of the present invention, such as Fig. 9 As shown, the signal processing circuit 120 includes a signal conversion circuit 121 and an analog output circuit 122 .

[0057] The first input end of the signal conversion circuit 121 serves as the first input end of the signal processing circuit 120, the second input end of the signal conversion circuit 121 serves as the second input end of the signal processing circuit 120, and the output end of the signal conversion circuit 121 is connected to the input end of the analog output circuit 122; the signal conversion circuit 121 is used to convert the resistance signal into a detection signal.

[0058] The output end of the analog output circuit 122 is connected to the input end of the central processing unit 200 , and the analog output signal is used to determine the analog output signal based on the detection signal.

[0059] Specifically, after the flexible electrode 111 membrane generates a resistance signal, the resistance signal is input into the signal conversion circuit 121, and the resistance signal is processed by the signal conversion circuit 121, for example, the resistance signal is converted, amplified, shaped, and impedance matched, and finally the resistance signal is converted into a detection signal. After being converted into a detection signal, the detection signal is sent to the analog output circuit 122, and the detection signal is further converted into an analog output signal. By converting the resistance signal multiple times, the recognition accuracy of the resistance signal by the subsequent circuit is improved, thereby improving the reliability and accuracy of pressure detection according to the converted analog output signal.

[0060] Furthermore, if Fig. 9As shown, the signal conversion circuit 121 includes a bridge conversion circuit 1211 and a signal amplification circuit 1212 .

[0061] The first input end of the bridge conversion circuit 1211 serves as the first input end of the signal conversion circuit 121, and the second input end of the bridge conversion circuit 1211 serves as the second input end of the signal conversion circuit 121. The first input end of the bridge conversion circuit 1211 is connected to the first input end of the signal amplification circuit 1212, and the output end of the bridge conversion circuit 1211 is connected to the second input end of the signal amplification circuit 1212. The bridge conversion circuit 1211 is used to convert the resistance signal of the common mode input of the flexible pressure sensor 110 into a voltage signal.

[0062] The output end of the signal amplifying circuit 1212 serves as the output end of the signal converting circuit 121 , and the signal amplifying circuit 1212 is used to determine the detection signal based on the voltage signal.

[0063] Specifically, Fig.10 is a circuit diagram of a bridge conversion circuit provided by an embodiment of the present invention, such as Fig.10 As shown, the bridge conversion circuit 1211 includes a resistor R1, a resistor R2 and a resistor R3, wherein: one end of the resistor R1 is connected to one end of the resistor R2 and then connected to the positive electrode of the power supply, the other end of the resistor R1 serves as the first input end of the bridge conversion circuit 1211, and after the other end of the resistor R2 is connected to one end of the resistor R3, the connection point serves as the output end of the bridge conversion circuit 1211, and the other end of the resistor R3 serves as the second input end of the bridge conversion circuit 1211 and is connected to the negative electrode of the power supply. In the bridge conversion circuit 1211, the other end of the resistor R1 collects the resistance signal of the second end corresponding to the first electrode component A, and converts the resistance signal into a voltage signal through the resistor R1 and directly outputs it to the first input end of the signal amplification circuit 1212. The other end of the resistor R3 collects the resistance signal of the second end corresponding to the second electrode component B, and converts the resistance signal into a divided voltage signal after voltage division by the resistors R2 and R3, and transmits the divided voltage signal to the second input end of the signal amplification circuit 1212 through the output end of the bridge conversion circuit 1211, so that the signal amplification circuit 1212 performs signal processing on the voltage signal to convert the voltage signal into a reliable detection signal.

[0064] Optionally, the signal amplification circuit 1212 is used to perform multi-stage signal amplification on the voltage signal output by the bridge conversion circuit 1211. The signal amplification circuit 1212 includes an instrument amplification circuit, a limiting circuit and a waveform shaping circuit. After receiving the voltage signal, the instrument amplification circuit increases the input impedance and expands the signal bandwidth while performing signal amplification with good anti-interference performance on the voltage signal. The limiting circuit includes an addition circuit and a TVS (Transient Voltage Suppressor) to limit the maximum and minimum values ​​of the detection signal finally output by the signal amplification circuit 1212, ensuring the stable and reliable operation of the subsequent analog output circuit 122. Afterwards, the waveform shaping circuit is used to filter the adjusted signal. The waveform shaping circuit may include an active filtering circuit and / or a passive filtering circuit. To solve the temperature drift problem, a passive filtering circuit may be used. For example, a passive capacitor may be connected in parallel to both ends of the feedback resistor in the signal amplification circuit 1212, and / or an RC filtering circuit or an LC filtering circuit may be used as the subsequent circuit of the limiting circuit. To solve the problem of high-frequency signal interference, an active filter circuit can be used, for example, a second-order Butterworth active filter circuit. If there are both temperature drift problems and high-frequency signal interference problems, the active filter circuit and the passive filter circuit can be combined, for example, a passive capacitor is connected in parallel to both ends of the feedback resistor in the signal amplification circuit 1212, and the second-order Butterworth active filter circuit is used as the post-stage circuit of the limiting circuit. The present invention is not limited to this.

[0065] Furthermore, if Fig. 9 As shown, the analog output circuit 122 includes a power amplifier circuit 1221 or a logic operation circuit 1222, and the analog output signal includes an analog amplified signal or a pressure detection signal.

[0066] The input end of the power amplifier circuit 1221 serves as the input end of the analog output circuit 122, and the output end of the power amplifier circuit 1221 is connected to the input end of the central processor 200. The power amplifier circuit 1221 is used to amplify the power of the detection signal, determine the analog amplified signal, and send the analog amplified signal to the central processor 200.

[0067] The first input end of the logic operation circuit 1222 serves as the input end of the analog output circuit 122, and the output end Out of the logic operation circuit 1222 is connected to the input end of the central processing unit 200. The logic operation circuit 1222 is used to compare the voltage value corresponding to the detection signal with the preset threshold analog signal, determine the pressure detection signal based on the comparison result, and send the pressure detection signal to the central processing unit 200.

[0068] Specifically, after the signal conversion circuit 121 converts the resistance signal into a reliable detection signal, the detection signal may be processed in the following two ways through the analog output circuit 122 .

[0069] (1) The detection signal is input into the power amplifier circuit 1221. The power amplifier circuit 1221 is a buffer formed by an operational amplifier. The voltage amplification factor of the power amplifier circuit 1221 is 1, but the output resistance of the power amplifier circuit 1221 is small, which can greatly improve the load capacity. That is, the voltage value corresponding to the analog amplified signal output by the power amplifier circuit 1221 is equal to the voltage value corresponding to the detection signal, but the load capacity corresponding to the analog amplified signal is higher than the load capacity corresponding to the detection signal. After the power amplifier circuit 1221 determines the analog output signal, the analog output signal is output to the central processor 200 for pressure detection.

[0070] Furthermore, the power amplifier circuit 1221 includes an amplifier circuit and a transient voltage suppressor TVS, wherein: The input end of the amplifier circuit serves as the input end of the power amplifier circuit 1221 , the output end of the amplifier circuit is connected to one end of the TVS, the other end of the TVS is connected to the negative pole of the power supply, and the output end of the amplifier circuit serves as the output end of the power amplifier circuit 1221 .

[0071] It should be noted that the TVS is arranged at the output end of the amplifier circuit to limit the maximum and minimum values ​​of the output detection signal. At the same time, it can also suppress interference such as static electricity and surge on the transmission line.

[0072] Optionally, the amplifier circuit may be a common collector amplifier circuit formed by a BJT (Bipolar Junction Transistor), or a common drain amplifier circuit formed by a FET (Field Effect Transistor), etc., which is not limited in the embodiment of the present invention.

[0073] Optionally, the power supply voltage range of the amplifier circuit may be 2.4V to 12V, which is not limited in the embodiment of the present invention.

[0074] (2) The detection signal is input into the logic operation circuit 1222, and the detection signal is compared with the preset threshold analog signal through the logic operation circuit 1222. The preset threshold analog signal is the pressure critical value of the blocked state of the fluid pipeline 500. The pressure detection signal can be determined according to the comparison result. For example, if the detection signal is greater than the preset threshold analog signal, it means that the target extrusion pressure corresponding to the detection signal has exceeded the pressure critical value, and the generated pressure detection signal is a low-level signal. If the detection signal is less than or equal to the preset threshold analog signal, it means that the target extrusion pressure corresponding to the detection signal has not exceeded the pressure critical value, and the generated pressure detection signal is a high-level signal. Afterwards, the pressure detection signal can be transmitted to the central processor 200 for pressure detection.

[0075] Furthermore, Fig.11 is a circuit diagram of a logic operation circuit provided by an embodiment of the present invention, such as Fig.11 As shown, the logic operation circuit 1222 includes a digital-to-analog converter (DAC) 1223, a comparator COM, a switch tube Q1 and a pull-up resistor R4.

[0076] The input end of the digital-to-analog converter 1223 is connected to the output end of the central processing unit 200, and the output end of the digital-to-analog converter 1223 is connected to the inverting input end of the comparator COM. The digital-to-analog converter 1223 is used to perform digital-to-analog conversion on the preset threshold signal sent by the central processing unit 200, determine the preset threshold analog signal, and send the preset threshold analog signal to the inverting input end of the comparator COM.

[0077] The non-inverting input terminal of the comparator COM serves as the first input terminal of the logic operation circuit 1222, the non-inverting input terminal of the comparator COM is used to receive the detection signal, the inverting input terminal of the comparator COM is used to receive the preset threshold analog signal, the output terminal of the comparator COM is connected to the first terminal of the switch tube Q1, and the comparator COM is used to compare the detection signal with the preset threshold analog signal to determine the comparison signal; the comparison signal is used to control the on-off state of the switch tube Q1 to determine the pressure detection signal.

[0078] The second end of the switch tube Q1 is connected to the negative electrode of the power supply, the third end of the switch tube Q1 is connected to one end of the pull-up resistor R4, and the other end of the pull-up resistor R4 is connected to the motherboard power supply and serves as the output end Out of the logic operation circuit 1222.

[0079] Specifically, after the detection signal is input into the non-inverting input terminal of the comparator COM, the comparator COM can compare the detection signal with the preset threshold analog signal input into the inverting input terminal. If the detection signal is greater than the preset threshold analog signal, the comparison signal output by the comparator COM is a high-level signal, that is, the signal at the first end of the switch tube Q1 is a high-level signal, so that the switch tube Q1 is turned on. Afterwards, the negative electrode of the power supply pulls down the signal at the output terminal Out of the logic operation circuit 1222 to a low-level signal, that is, the pressure detection signal is a low-level signal. If the detection signal is less than or equal to the preset threshold analog signal, the comparison signal output by the comparator COM is a low-level signal, that is, the signal at the first end of the switch tube Q1 is a low-level signal, so that the switch tube Q1 is turned off. Afterwards, the mainboard power supply pulls up the signal at the output terminal Out of the logic operation circuit 1222 to a high-level signal through the pull-up resistor R4, that is, the pressure detection signal is a high-level signal.

[0080] It should be noted that the mainboard power supply is the power supply of the mainboard IO (Input / Output) port. The power supply voltage corresponding to the mainboard power supply can be 1.8V, 3.3V or 5V, which is not limited in the embodiment of the present invention.

[0081] In addition, the preset threshold analog signal input to the inverting input of the comparator COM may be input before, after or at the same time as the detection signal is input to the inverting input, which is not limited in this embodiment of the present invention.

[0082] Optionally, the switch tube Q1 may include a triode, an NMOS (N-Metal-Oxide-Semiconductor) transistor or an IGBT (Insulate-Gate Bipolar Transistor), etc., which is not limited in the embodiment of the present invention. When the switch tube Q1 is a triode, the base of the triode is the first end of the switch tube Q1, the emitter of the triode is the second end of the switch tube Q1, and the collector of the triode is the third end of the switch tube Q1, then the output end Out of the logic operation circuit 1222 is an OC (Open-Collector) output. When the switch tube Q1 is an NMOS transistor, the gate of the NMOS transistor is the first end of the switch tube Q1, the source of the NMOS transistor is the second end of the switch tube Q1, and the drain of the NMOS transistor is the third end of the switch tube Q1.

[0083] Further, when the analog output circuit 122 includes a power amplifier circuit 1221, the central processor 200 is used to convert the analog amplified signal into a digital amplified signal, and determine the pressure detection result corresponding to the fluid pipeline 500 based on the comparison result between the digital amplified signal and a preset threshold signal.

[0084] In the case where the analog output circuit 122 includes a logic operation circuit 1222 , the central processor 200 is used to determine the pressure detection result corresponding to the fluid pipeline 500 based on the level state of the pressure detection signal.

[0085] Specifically, if the analog output circuit 122 includes a power amplifier circuit 1221, the ADC (Analog-to-Digital Converter) in the central processor 200 can perform analog-to-digital conversion on the analog amplified signal. After the conversion is converted into a digital amplified signal, the central processor 200 can compare the digital amplified signal with the preset threshold signal before the conversion, determine the pressure detection result of the fluid pipeline 500 according to the comparison result, and perform corresponding operations according to the pressure detection result. For example, taking the pipe blockage judgment according to the pressure detection result as an example, if the digital amplified signal is greater than the preset threshold signal, it indicates that the pressure borne by the fluid pipeline 500 has exceeded the pressure critical value, indicating that the fluid pipeline 500 has been blocked. If the digital amplified signal is less than or equal to the preset threshold signal, it indicates that the pressure borne by the fluid pipeline 500 does not exceed the pressure critical value, indicating that the fluid pipeline 500 is not blocked. If the analog output circuit 122 includes a logic operation circuit 1222, the central processor 200 can directly determine the pressure detection result corresponding to the fluid pipeline according to the level state of the pressure detection signal, and perform corresponding operations according to the pressure detection result. For example, taking pipe blockage determination based on pressure detection results as an example, if the pressure detection signal is a low-level signal, it indicates that the fluid pipeline 500 is blocked, and if the pressure detection signal is a high-level signal, it indicates that the fluid pipeline 500 is not blocked.

[0086] The embodiment of the present invention further provides a pressure detection method, which is applied to the steam ablation pressure detection system as described in any one of the above items. Fig.12 is a flow chart of a pressure detection method provided by an embodiment of the present invention, such as Fig.12 As shown, the pressure detection method includes the following steps 1210 and 1220.

[0087] Step 1210, receiving an analog output signal; the analog output signal is determined based on a resistance signal determined by the flexible pressure sensor when the syringe assembly squeezes the flexible pressure sensor when infusing the fluid pipeline.

[0088] Step 1220: Determine a pressure detection result corresponding to the fluid pipeline based on the analog output signal.

[0089] The pressure detection method provided in the embodiment of the present invention measures the extrusion force on the flexible pressure sensor caused by the relative movement between the syringe assembly and the fixing part during the infusion process through a flexible pressure sensor, and converts the extrusion force into a resistance signal, and then determines an analog output signal according to the resistance signal, and determines the pressure detection result corresponding to the fluid pipeline according to the analog output signal. By changing the force measurement principle of the pressure detection sensor during pressure detection, the influence of the water flow velocity, impurities and bubbles in the water flow on the measurement result of the pressure detection sensor is avoided, thereby improving the accuracy and reliability of pressure detection.

[0090] An embodiment of the present invention further provides a steam ablation device, comprising an injector assembly, a fixing, a fluid pipeline and a steam ablation pressure detection system as described in any one of the above items, wherein the injector assembly is arranged on the fixing, and the injector assembly is connected to the fluid pipeline.

[0091] Specifically, the syringe assembly includes a syringe body and a force transmission structure, and the syringe body is arranged on the force transmission structure. The force transmission principle of the syringe assembly to inject water into the fluid pipeline is as follows: the push rod motor pushes the piston of the syringe body to move toward the fluid pipeline, so that the fluid in the syringe body enters the fluid pipeline. At the same time, the piston in the syringe body is installed on the force transmission structure, and the force applied to the syringe body is transmitted to the force transmission structure, so that the force transmission structure squeezes the flexible pressure sensor to achieve force transmission.

[0092] Optionally, the force transmission structure and the fixing part need to be made of materials with low friction and small elastic deformation as much as possible, for example, POM (Polyformaldehyde), nylon or PTFE (Polytetrafluoroethylene), etc., preferably PTFE. In addition, after the force transmission structure, the syringe body and the fixing part are installed, lubricating oil can be applied between the force transmission structure and the fixing part to make the target extrusion force of the flexible pressure sensor as close as possible to the thrust of the push rod motor, further reducing the influence of friction on force transmission.

[0093] On the other hand, the present invention further provides a computer program product, the computer program product includes a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, when the computer program is executed by the steam ablation pressure detection system, the computer can execute the pressure detection method provided by the above methods, the method includes: Receive an analog output signal; the analog output signal is determined based on a resistance signal determined by the flexible pressure sensor when the syringe assembly squeezes the flexible pressure sensor when infusing the fluid pipeline; determine a pressure detection result corresponding to the fluid pipeline based on the analog output signal.

[0094] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the steam ablation pressure detection system executes the pressure detection method provided by the above methods, the method comprising: Receive an analog output signal; the analog output signal is determined based on a resistance signal determined by the flexible pressure sensor when the syringe assembly squeezes the flexible pressure sensor when infusing the fluid pipeline; determine a pressure detection result corresponding to the fluid pipeline based on the analog output signal.

[0095] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0096] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0097] 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 embodiments of the present invention.

Claims

1. A steam ablation pressure detection system, characterized in that: include: Pressure detection sensor and central processing unit, wherein: The pressure detection sensor comprises a flexible pressure sensor and a signal processing circuit, wherein the flexible pressure sensor is arranged in a gap between the syringe assembly and the fixing member, wherein the gap matches the moving direction of the syringe assembly, and the syringe assembly is arranged on the fixing member, and the flexible pressure sensor is used to determine a resistance signal corresponding to the flexible pressure sensor in the gap when the syringe assembly squeezes the flexible pressure sensor when perfusing the fluid pipeline; the signal processing circuit is respectively connected to the flexible pressure sensor and the central processor, and the signal processing circuit is used to determine an analog output signal based on the resistance signal; The central processing unit is used to determine the pressure detection result corresponding to the fluid pipeline based on the analog output signal.

2. The steam ablation pressure detection system according to claim 1, characterized in that: The flexible pressure sensor is specifically used for: When the syringe assembly squeezes the flexible pressure sensor when injecting fluid into the fluid pipeline, determining a resistance signal corresponding to the flexible pressure sensor in the gap based on a preset mapping relationship; The preset mapping relationship is used to characterize the linear mapping relationship between the extrusion force and the resistance signal corresponding to the flexible pressure sensor within a preset pressure range.

3. The steam ablation pressure detection system according to claim 2, characterized in that: The flexible pressure sensor comprises a flexible electrode and conductive silicone, wherein: The flexible electrode comprises a first electrode assembly and a second electrode assembly which are not in contact with each other, wherein the first ends of the first electrode assembly and the second electrode assembly respectively correspond to a forked region, the second end of the first electrode assembly is connected to the first input end of the signal processing circuit, and the second end of the second electrode assembly is connected to the second input end of the signal processing circuit; The conductive silicone is arranged on the interdigital area, and is used to conduct the first electrode assembly and the second electrode assembly when the syringe assembly squeezes the conductive silicone when infusing the fluid pipeline, and based on the preset mapping relationship, determine the resistance signal corresponding to the target extrusion force that the conductive silicone bears, and send the resistance signal to the signal processing circuit based on the second ends corresponding to each of the first electrode assembly and the second electrode assembly.

4. The steam ablation pressure detection system according to claim 3, characterized in that: The conductive silicone rubber is fluorine-containing conductive silicone rubber.

5. The steam ablation pressure detection system according to any one of claims 1 to 4, characterized in that: The signal processing circuit includes a signal conversion circuit and an analog output circuit, wherein: The first input end of the signal conversion circuit serves as the first input end of the signal processing circuit, the second input end of the signal conversion circuit serves as the second input end of the signal processing circuit, and the output end of the signal conversion circuit is connected to the input end of the analog output circuit; the signal conversion circuit is used to convert the resistance signal into a detection signal; The output end of the analog output circuit is connected to the input end of the central processing unit, and the analog output signal is used to determine the analog output signal based on the detection signal.

6. The steam ablation pressure detection system according to claim 5, characterized in that: The analog output circuit includes a power amplifier circuit or a logic operation circuit, and the analog output signal includes an analog amplified signal or a pressure detection signal, wherein: The input end of the power amplifier circuit serves as the input end of the analog output circuit, the output end of the power amplifier circuit is connected to the input end of the central processing unit, and the power amplifier circuit is used to amplify the power of the detection signal, determine the analog amplified signal, and send the analog amplified signal to the central processing unit; The first input end of the logic operation circuit serves as the input end of the analog output circuit, and the output end of the logic operation circuit is connected to the input end of the central processing unit. The logic operation circuit is used to compare the voltage value corresponding to the detection signal with a preset threshold analog signal, determine the pressure detection signal based on the comparison result, and send the pressure detection signal to the central processing unit.

7. The steam ablation pressure detection system according to claim 6, characterized in that: The power amplifier circuit includes an amplifier circuit and a transient voltage suppressor tube TVS, wherein: The input end of the amplifier circuit serves as the input end of the power amplifier circuit, the output end of the amplifier circuit is connected to one end of the TVS, the other end of the TVS is connected to the negative pole of the power supply, and the output end of the amplifier circuit serves as the output end of the power amplifier circuit.

8. The steam ablation pressure detection system according to claim 6, characterized in that: The logic operation circuit includes a digital-to-analog converter, a comparator, a switch tube and a pull-up resistor, wherein: The input end of the digital-to-analog converter is connected to the output end of the central processing unit, and the output end of the digital-to-analog converter is connected to the inverting input end of the comparator. The digital-to-analog converter is used to perform digital-to-analog conversion on the preset threshold signal sent by the central processing unit, determine the preset threshold analog signal, and send the preset threshold analog signal to the inverting input end of the comparator; The non-inverting input terminal of the comparator serves as the first input terminal of the logic operation circuit, the non-inverting input terminal of the comparator is used to receive the detection signal, the inverting input terminal of the comparator is used to receive the preset threshold analog signal, the output terminal of the comparator is connected to the first terminal of the switch tube, the comparator is used to compare the detection signal with the preset threshold analog signal to determine the comparison signal; the comparison signal is used to control the on-off state of the switch tube to determine the pressure detection signal; The second end of the switch tube is connected to the negative pole of the power supply, the third end of the switch tube is connected to one end of the pull-up resistor, the other end of the pull-up resistor is connected to the mainboard power supply and serves as the output end of the logic operation circuit.

9. The steam ablation pressure detection system according to claim 6, characterized in that: In the case where the analog output circuit includes a power amplifier circuit, the central processor is used to convert the analog amplified signal into a digital amplified signal, and determine the pressure detection result corresponding to the fluid pipeline based on the comparison result of the digital amplified signal and a preset threshold signal; In the case where the analog output circuit includes a logic operation circuit, the central processing unit is used to determine the pressure detection result corresponding to the fluid pipeline based on the level state of the pressure detection signal.

10. A steam ablation device, characterized in that: It comprises a syringe assembly, a fixing part, a fluid pipeline and the steam ablation pressure detection system as described in any one of claims 1 to 9, wherein the syringe assembly is arranged on the fixing part, and the syringe assembly is connected to the fluid pipeline.

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