Steam temperature control device and steam temperature control method based on impedance detection

Abstract

The present application relates to the technical field of medical apparatus, and provides a steam temperature control device and method based on impedance detection, the steam temperature control device based on impedance detection comprises: an ablation handle, a steam coil and a steam temperature control system.The ablation handle is used for outputting steam, the steam coil is arranged on the ablation handle, and the steam coil is used for heating sterile water into steam.The steam coil comprises an input section, a coil section, an output section, a first terminal post, a second terminal post and a third terminal post, and the input section, the coil section and the output section are sequentially communicated.The steam temperature control system comprises a power output module, a detection module, a sampling resistor, a first circuit, a second circuit and a third circuit, the temperature of the steam coil is calculated by measuring the impedance of the steam coil, the problem that the protection lags behind and the ablation handle is burned due to the delay in temperature measurement is solved, the consistency of the steam heat output by the ablation handle is improved through direct closed-loop control of the temperature of the steam coil, and the consistency of the ablation operation is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a steam temperature control device and method based on impedance detection. Background Technology

[0002] During the steam ablation treatment of the prostate, it is necessary to accurately control the steam to avoid excessive steam overflow that could burn the urethra and other healthy tissues in the prostate, while also avoiding insufficient steam heat that could lead to poor treatment results.

[0003] In related technologies, in the prostate steam ablation system, the ablation handle and the K-type thermocouple for measuring the temperature of the ablation tube are welded to the steam coil. Welding between the two materials (nickel-chromium alloy) of the K-type thermocouple and the material of the steam coil (chromium-nickel-iron alloy tube) is difficult and the processing cost is high. The wall of the steam coil is relatively thin, and it is easy to burn through during the welding process. The weld point is too small and the thermocouple is easy to fall off in the later production.

[0004] Furthermore, the temperature is measured by a K-type thermocouple welded to the steam coil. During the treatment control process, the steam power supply sends power, the steam sending tube heats up, and the temperature changes are measured by the thermocouple. The temperature of the steam sending tube is detected by the thermocouple. There is a 2-3 second lag effect, which causes the controller to only output constant power to the steam coil. It cannot achieve closed-loop temperature adjustment of the steam coil through temperature, resulting in fluctuations in the heat output of water vapor in the steam coil and unstable surgical treatment effect.

[0005] In addition, there is a 2-3 second lag effect between the heating of the steam coil and the detection of the temperature change by the thermocouple. When the control detects that the temperature has exceeded the protection temperature, the temperature of the steam coil has already exceeded the protection temperature 3 seconds ago, which can easily cause the thermal protection of the ablation handle to fail, thus causing the ablation handle to burn out. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a steam temperature control device based on impedance detection, which aims to measure temperature by detecting changes in the impedance of a steam coil, thereby ensuring the stability of the steam heat output of the thermal steam ablation equipment while reducing costs.

[0007] This invention also proposes a steam temperature control method.

[0008] The steam temperature control device based on impedance detection according to a first aspect of the present invention includes:

[0009] An ablation handle, the ablation handle being used to output steam;

[0010] A steam coil is disposed on the ablation handle. The steam coil is used to heat sterile water into steam. The steam coil includes an input section, a coil section, an output section, a first terminal, a second terminal, and a third terminal. The input section, the coil section, and the output section are connected in sequence. One end of the first terminal is connected to the output section, one end of the second terminal is connected to the input section, and one end of the third terminal is connected to the coil section.

[0011] A steam temperature control system includes a power output module, a detection module, a sampling resistor, a first circuit, a second circuit, and a third circuit. One end of the first circuit is connected to the power output module, and the other end has a first port. One end of the second circuit is connected to the detection module, and the other end has a second port. One end of the third circuit is connected to the power output module, and the other end has a third port. The detection module is electrically connected to both the first circuit and the third circuit. The sampling resistor is located in the third circuit, and both ends of the sampling resistor are electrically connected to the detection module. The first port is connected to the first terminal through a wire, the second port is connected to the second terminal through a wire, and the third port is connected to the third terminal through a wire.

[0012] The steam temperature control device based on impedance detection according to an embodiment of the present invention sets the steam output temperature and obtains the feedback temperature by measuring the resistance of the steam coil, thus performing closed-loop control for more stable control of the output steam temperature. The temperature calculated from the resistance of the steam coil itself is an electrical signal transmission, resulting in rapid response and strong controllability. Compared with using thermocouples to measure the steam coil, there is no heat transfer delay, and the real-time performance is better. Closed-loop control of the steam coil head temperature ensures strong consistency in the output steam heat, resulting in stable ablation effects in prostate steam ablation. Specifically, by measuring the temperature of the steam coil by measuring its impedance, the device solves the problems of difficult K-type thermocouple wire welding and easy detachment after long-term placement, as well as the problem of thermocouple temperature measurement delay leading to burnt ablation handle. Direct closed-loop control of the steam coil temperature improves the consistency of the steam heat output from the ablation handle, thereby enhancing the consistency of the ablation procedure.

[0013] According to one embodiment of the present invention, the third terminal is connected to one end of the coil segment adjacent to the output segment.

[0014] According to one embodiment of the present invention, the resistance ratio of the steam coil to the resistance of the wire is greater than 200:1.

[0015] According to one embodiment of the present invention, at 20 degrees Celsius, the overall resistance of the steam coil is greater than or equal to 1 ohm.

[0016] According to one embodiment of the present invention, the steam temperature control system further includes a controller, which is electrically connected to the power output module and the detection module respectively.

[0017] According to one embodiment of the present invention, the first terminal, the second terminal and the third terminal are each provided with a terminal ring, and each terminal ring is connected to a wire.

[0018] According to one embodiment of the present invention, each of the said connecting rings is provided with a welding hole.

[0019] According to one embodiment of the invention, the steam coil is made of 316L stainless steel.

[0020] According to one embodiment of the present invention, the ablation handle includes:

[0021] The housing, wherein the steam coil is disposed in the housing;

[0022] An infusion tube, wherein the infusion tube is connected to the input section of the steam coil;

[0023] A steam delivery needle is disposed in the housing and connected to the output section of the steam coil for outputting steam;

[0024] A trigger button, located in the housing, is used to trigger steam output from the steam output needle.

[0025] According to a second aspect embodiment of the steam temperature control method of the present invention, the above-described impedance-based steam temperature control device is applied, and the steps include:

[0026] In preheating mode, sterile water is heated to 90 to 95 degrees Celsius while simultaneously pushing the sterile water into the steam coil;

[0027] In treatment mode, the sterile water in the steam coil is heated into steam, and the temperature of one end of the coil segment adjacent to the output segment is controlled at 135 degrees Celsius to 145 degrees Celsius, thereby controlling the ablation handle to output steam.

[0028] According to one embodiment of the present invention, when the temperature of one end of the coil segment adjacent to the output segment is higher than the alarm temperature, the output of the power output module is turned off.

[0029] The steam temperature control method according to an embodiment of the present invention includes the above-described impedance-based steam temperature control device, and therefore has all the technical effects of the above-described impedance-based steam temperature control device, which will not be repeated here.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the steam temperature control device based on impedance detection provided in an embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the structure of the steam coil provided in an embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the connection between the steam temperature control system and the steam coil circuit provided in an embodiment of the present invention.

[0035] Figure 4 This is a diagram showing the relationship between the resistance and temperature of the steam coil in a steam temperature control device based on impedance detection, provided in an embodiment of the present invention.

[0036] Figure 5 This is a diagram showing the relationship between the head resistance and temperature of the steam coil in the steam temperature control device based on impedance detection provided in this embodiment of the invention.

[0037] Figure 6 This is a schematic diagram of the control flow of the steam temperature control device based on impedance detection provided in an embodiment of the present invention.

[0038] Figure 7 This is a schematic diagram of the heating curve of the treatment mode of the steam temperature control device based on impedance detection provided in the embodiment of the present invention.

[0039] Figure 8 This is a schematic diagram of the working mode of the steam temperature control device based on impedance detection provided in an embodiment of the present invention.

[0040] Figure label:

[0041] 11. Steam coil; 12. Infusion tubing; 13. Trigger button; 14. Steam temperature control system; 15. Steam delivery needle;

[0042] 23. First terminal; 25. Second terminal; 27. Third terminal; 21. Output section; 22. Coil section; 24. Input section; 26. Terminal ring;

[0043] 301. Controller; 302. Power output module; 303. Detection module; 304. First port; 305. Electrical model; 306. Head resistor; 307. Bottom resistor; 308. Second port; 309. Third port; 310. Sampling resistor. Detailed Implementation

[0044] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0047] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Please refer to the reference. Figures 1 to 3 According to an embodiment of the first aspect of the present invention, a steam temperature control device based on impedance detection includes: an ablation handle, a steam coil 11, and a steam temperature control system 14.

[0050] like Figure 1 As shown, according to one embodiment of the present invention, the ablation handle is used to output steam. The ablation handle includes a housing, an infusion tube 12, a steam delivery needle 15, and a trigger button 13. A steam coil 11 is disposed in the housing, and a steam temperature control system 14 is disposed in the steam ablation host. The infusion tube 12 is connected to the input section 24 of the steam coil 11. The steam delivery needle 15 is disposed in the housing and is connected to the output section 21 of the steam coil 11 for outputting steam. The trigger button 13 is disposed in the housing for triggering steam to be output from the steam output needle. It can be understood that the trigger button 13 is used to trigger the software controller 301 to control sterile water to be delivered from the lower part of the steam coil 11 through the infusion tube 12. Under the heating control of the steam coil 11, the sterile water is heated into steam, flows through the upper part of the steam coil 11, and is output from the steam output needle to the lesion for treatment. It should be noted that the steam coil 11 has a conveying channel in which sterile water is conveyed and heated into steam; the steam temperature control system 14 is a control board installed in the steam ablation host, and the trigger button 13 is electrically connected to it through wires to control the steam output.

[0051] like Figure 2As shown, a steam coil 11 is disposed on the ablation handle. The steam coil 11 is used to heat sterile water into steam. The steam coil 11 includes an input section 24, a coil section 22, an output section 21, a first terminal 23, a second terminal 25, and a third terminal 27. The input section 24, the coil section 22, and the output section 21 are connected in sequence. One end of the first terminal 23 is connected to the output section 21, one end of the second terminal 25 is connected to the input section 24, and one end of the third terminal 27 is connected to the coil section 22. For example, the coil section 22 is formed by winding, and its two ends are respectively connected to the input section 24 and the output section 21. The input section 24 has a liquid inlet, and the output section 21 has a liquid outlet. The liquid inlet is used to connect to the infusion tube 12 for conveying sterile water, and the upper liquid outlet is used to connect to the infusion tube 12 for conveying steam, so as to output steam at the ablation handle. The first terminal 23 is connected to the output section 21, the second terminal 25 is connected to the input section 24, and the third terminal 27 is connected to the coil section 22, which allows the heating current to cover the entire steam coil 11 and improves the heating uniformity.

[0052] It should be noted that the section of the steam coil 11 located between the first terminal 23 and the third terminal 27 is the head of the steam coil 11, which is used to measure the voltage at the head of the steam coil.

[0053] like Figure 3 The diagram shows the connection between the steam temperature control system 14 and the steam coil 11. The steam temperature control system 14 is located in the steam ablation host. The electrical model 305 is a circuit model of the steam coil 11, used to represent the circuit connections. It should be noted that the head resistor 306 represents the resistance of the section of the steam coil 11 between the first terminal 23 and the third terminal 27, while the bottom resistor 307 represents the resistance of the section of the steam coil 11 between the third terminal 27 and the second terminal 25. The steam temperature control system 14 includes a power output module 302, a detection module 303, a sampling resistor 310, a first circuit, a second circuit, and a third circuit.

[0054] For example, one end of the first circuit is connected to the power output module 302, and the other end is provided with a first port 304. One end of the second circuit is connected to the detection module 303, and the other end is provided with a second port 308. One end of the third circuit is connected to the power output module 302, and the other end is provided with a third port 309. The detection module 303 is electrically connected to the first circuit and the third circuit respectively. The sampling resistor 310 is provided in the third circuit, and the two ends of the sampling resistor 310 are electrically connected to the detection module 303. The first port 304 is connected to the first terminal 23 through a wire. The second port 308 is connected to the second terminal 25 through a wire. The third port 309 is connected to the third terminal 27 through a wire.

[0055] In other words, one end of the first circuit is led out from the power output module 302, and the other end is connected to the head resistor 306. One end of the second circuit is connected to the detection module 303, and the other end is connected between the head resistor 306 and the bottom resistor 307. One end of the third circuit is connected to the power output module 302, and the other end is connected to the bottom resistor 307. The detection module 303 is electrically connected to both the first and third circuits. The sampling resistor 310 is located in the third circuit, and its two ends are electrically connected to the detection module 303. Specifically, the first circuit has a first port 304, which is connected to the first terminal 23 via a wire. The second circuit has a second port 308, which is connected to the second terminal 25 via a wire. The third circuit has a third port 309, which is connected to the third terminal 27 via a wire.

[0056] Steam temperature control system 14 measurement process: The first terminal 23, the third terminal 27, and the second terminal 25 of the steam coil 11 are connected to the first port 304, the second port 308, and the third port 309, respectively, as shown in the figure. Figure 3 As shown. The output current of the power output module 302 flows from the first port 304 through the first terminal 23, through the steam coil 11, out through the second terminal 25, and back to the power output module 302 from the third port 309. The detection module 303 measures the voltage between the first port 304 and the third port 309 as the overall voltage V1 of the steam coil, and the voltage between the first port 304 and the second port 308 as the head voltage V2 of the steam coil. The sampling resistor 310 measures the current I. The ratio of V1 to current I is calculated to obtain the overall resistance Rt of the steam coil 11, and the ratio of V2 to current I is calculated to obtain the head resistance Rh of the steam coil 11.

[0057] The relationship between the resistance and temperature of steam coil 11 is as follows: Figure 4 As shown, the resistance of the steam coil 11 is 1 ohm at room temperature (20 degrees Celsius) and 1.124 ohms at 200 degrees Celsius; the relationship between the resistance 306 at the head of the steam coil 11 and temperature is as follows: Figure 5 As shown, the resistance of the head of the steam coil 11 is 50 milliohms at room temperature (20 degrees Celsius) and 62.45 milliohms at 200 degrees Celsius. By measuring the resistance of the steam coil 11 and the head resistance of 306 ohms using the steam temperature control system 14, the overall temperature and the head temperature of the steam coil 11 can be calculated. Of course, the resistance varies depending on the size, material, and other structural features of different steam coils 11. Specifically, the current temperature can be determined by measuring the resistance of the steam coil 11 at room temperature and how its resistance changes with temperature, thus achieving the purpose of temperature detection.

[0058] The relationship between the resistance and temperature of steam coil 11 is as follows: Figure 4 As shown, the temperature of the steam coil 11 and its resistance are linearly related within a certain range; the steam temperature control system 14 controls the temperature of the head of the steam coil 11 to ensure the temperature at which the water vapor leaves the steam coil 11; and controls the overall temperature of the steam coil 11 to ensure the temperature of the sterile water within the steam coil 11. The flowchart for the resistance control of the steam coil 11 is shown below. Figure 6 As shown, the temperature of the steam coil 11 is set according to the required steam temperature. The target resistance of the coil is obtained by analyzing the relationship between coil temperature and resistance. The resistance of the steam coil 11 is fed back through a measuring circuit. The target resistance and the feedback resistance are input into the controller 301. The controller 301 is a closed-loop controller. The coil resistance provides real-time feedback on the coil temperature, resulting in a high overall loop speed. The controller 301 can adjust the frequency very frequently, ensuring good dynamic performance and high stability of the steam coil 11. This maintains the stability of the heat output from the ablation handle and the consistency of the treatment effect. By controlling the resistance of the steam coil 11, the temperature of the steam coil 11 can be controlled, thereby controlling the temperature of the output steam and ensuring the stability of the output heat.

[0059] According to an embodiment of the present invention, the steam temperature control device based on impedance detection sets the steam output temperature and then obtains the feedback temperature by measuring the resistance of the steam coil 11, performing closed-loop control for more stable control of the output steam temperature. The temperature calculated using the resistance of the steam coil 11 itself is an electrical signal transmission, resulting in rapid response and strong controllability. Compared with measuring the steam coil 11 using a thermocouple, there is no heat transfer delay, and the real-time performance is better. Closed-loop control of the steam coil 11 head temperature ensures strong consistency in the output steam heat, resulting in stable ablation effects in prostate steam ablation. Specifically, measuring the temperature by measuring the impedance of the steam coil 11 solves the problems of difficult K-type thermocouple wire welding and easy detachment after long-term placement, as well as the problem of thermocouple temperature measurement delay leading to burnt ablation handle.

[0060] In one embodiment, the power output module 302 can control either DC voltage regulation or voltage PWM. When the control mode is DC voltage regulation, current sampling can be performed throughout the entire operating cycle. When the voltage PWM mode is used, current sampling is performed within the voltage window during operation. When the control mode is DC voltage regulation, DC voltage interference is small, which can improve the system's EMC performance.

[0061] In one embodiment, the detection module 303 is a voltage and current measurement module used to measure the voltage of the steam coil 11, the head voltage of the coil segment 22, and the current flowing through it. The detection module 303 has a high impedance input at the megaohm level, which results in a small shunt to the steam coil 11 and a small impact on the power output, thereby improving the measurement accuracy.

[0062] According to one embodiment of the present invention, the third terminal 27 is connected to one end of the coil segment 22 adjacent to the output segment 21. Exemplarily, the steam coil 11 is fed from bottom to top. The steam temperature control system 14 controls sterile water at room temperature (20 degrees Celsius) to flow in through the bottom inlet. After being heated by the steam coil 11, it becomes steam at 103 degrees Celsius and flows out through the top outlet. Therefore, the temperature of the steam coil 11 increases from bottom to top. The end of the coil segment 22 adjacent to the output segment 21 is the head, which is the area with the highest temperature. Controlling the head temperature controls the final heating temperature of the steam. Therefore, the third terminal 27 is connected to one end of the coil segment 22 adjacent to the output segment 21. Optionally, the connection position of the third terminal 27 is set at 1 / 20 of the distance from the output segment 21 on the coil segment 22, to measure the voltage at the head of the coil segment 22 and monitor the temperature at the head of the coil.

[0063] According to one embodiment of the present invention, the resistance ratio of the steam coil 11 to the resistance of the wire is higher than 200:1. For example, the wire connecting the terminals is No. 7 wire, preferably made of copper, with a total wire resistance of 4 milliohms. The steam coil 11 receives the vast majority of the electrical power. The low resistance consumed by the wires and the small power they bear help reduce heat generation in the circuit and improve heating efficiency. The small proportion of power consumed by the wires also reduces the impact of wire inconsistency on the entire system and helps improve output consistency.

[0064] According to one embodiment of the present invention, the overall resistance of the steam coil 11 is 1 ohm at 20 degrees Celsius, so as to facilitate parameter adjustment and temperature detection based on resistance changes.

[0065] According to one embodiment of the present invention, the steam temperature control system 14 further includes a controller 301, which is electrically connected to the power output module 302 and the detection module 303, respectively. It is understood that the controller 301 is used to control the power output module 302 and the detection module 303 to operate or stop.

[0066] like Figure 2 As shown, according to one embodiment of the present invention, the first terminal 23, the second terminal 25, and the third terminal 27 are all provided with terminal rings 26, each terminal ring 26 being connected to a wire, facilitating wire connection and ensuring a stable and reliable connection. Furthermore, each terminal ring 26 is provided with a soldering hole, thereby improving the ease of connection.

[0067] According to one embodiment of the present invention, the steam coil 11 is made of 316L stainless steel. In this embodiment, the steam coil 11 and the first terminal 23, the second terminal 25, and the third terminal 27 are all made of 306L stainless steel. 316L stainless steel has excellent corrosion resistance and good mechanical strength. Under high temperature and harsh environments, 316L stainless steel exhibits excellent performance, among which the characteristic of resistivity changing with temperature is particularly critical. Since 316L stainless steel also has a low carbon content, it will not form harmful carbides at high temperatures, avoiding the risk of intergranular corrosion. At the same time, the steam coil 11 and the first terminal 23, the second terminal 25, and the third terminal 27 are made of the same material, which is easy to weld, simple to process, and low in cost.

[0068] Please refer to the reference. Figure 6 and Figure 8 According to a second aspect embodiment of the steam temperature control method of the present invention, the above-described impedance-based steam temperature control device is applied, and the steps include:

[0069] In preheating mode, sterile water is heated to 90-95 degrees Celsius while simultaneously pushing sterile water into steam coil 11. This preheating mode can also be a standby mode, in which sterile water is heated to 95 degrees Celsius while simultaneously pushing sterile water into steam coil 11 at a low and constant rate to maintain the pressure in the ablation handle's tubing and prevent backflow. When steam is needed, it can be quickly heated to form steam, reducing waiting time.

[0070] In treatment mode, sterile water inside the steam coil 11 is heated into steam. The temperature of the end of coil segment 22 adjacent to output segment 21 is controlled between 135°C and 145°C, controlling the steam output from the ablation handle. In treatment mode, the head temperature of coil segment 22 is controlled at 140°C, and the output steam temperature is 103°C. After the controller 301 is started, it enters standby mode. After the standby mode is completed, it can be started to enter treatment mode, and after the treatment mode is completed, it returns to standby mode. When the controller 301 switches from standby mode to treatment mode, the head of the steam coil 11 heats up rapidly, as shown in the curve. Figure 7 As shown, it reaches the specified temperature within 1.4 seconds, exhibiting a fast response speed and the ability to produce steam upon triggering.

[0071] According to one embodiment of the present invention, when the temperature of one end of coil segment 22 adjacent to output segment 21 is higher than the alarm temperature, the output of power output module 302 is shut off. That is, when the head temperature of steam coil 11 is higher than the alarm temperature, a protection mechanism is triggered, shutting off the output of the power module to protect steam coil 11. Compared to measuring the temperature of steam coil 11 using a thermocouple, where the heat transfer from steam coil 11 to the thermocouple has a 2-3 second delay, resulting in protection lag, temperature measurement using the resistance of steam coil 11 itself involves the transmission of an electrical signal, eliminating the reaction delay problem and providing superior protection.

[0072] The steam temperature control method according to an embodiment of the present invention includes the above-described impedance-based steam temperature control device, and therefore has all the technical effects of the above-described impedance-based steam temperature control device, which will not be repeated here.

[0073] Finally, it should be noted that the above embodiments are only for illustrating the present invention and not for limiting the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. An impedance detection-based steam temperature control device, characterized by, The application relates to an impedance detection based steam temperature control device, comprising: an ablation handle for outputting steam; a steam coil arranged in the ablation handle, the steam coil being used for heating sterile water into steam, the steam coil comprising an input section, a coil section, an output section, a first terminal post, a second terminal post and a third terminal post, the input section, the coil section and the output section being sequentially communicated, one end of the first terminal post being connected to the output section, one end of the second terminal post being connected to the input section, and one end of the third terminal post being connected to the coil section; a steam temperature control system comprising a power output module, a detection module, a sampling resistor, a first circuit, a second circuit and a third circuit, one end of the first circuit being connected to the power output module, the other end of the first circuit being provided with a first port, one end of the second circuit being connected to the detection module, the other end of the second circuit being provided with a second port, one end of the third circuit being connected to the power output module, the other end of the third circuit being provided with a third port, the detection module being electrically connected to the first circuit and the third circuit respectively, the sampling resistor being arranged in the third circuit, and the sampling resistor being electrically connected to the detection module at both ends, the first port being connected to the first terminal post through a wire, the second port being connected to the second terminal post through a wire, and the third port being connected to the third terminal post through a wire.

2. The impedance detection-based steam temperature control device according to claim 1, wherein, The third terminal post is connected to one end of the coil section adjacent to the output section.

3. The impedance detection based steam temperature control device of claim 1, wherein, The resistance ratio of the steam coil to the wire is higher than 200:

1.

4. The impedance detection based steam temperature control device of claim 3, wherein, The overall resistance of the steam coil is greater than or equal to 1 ohm at 20 degrees Celsius.

5. The impedance detection based steam temperature control device of claim 1, wherein, The steam temperature control system further comprises a controller, the controller being electrically connected to the power output module and the detection module respectively.

6. The impedance detection based steam temperature control device of claim 1, wherein, The first terminal post, the second terminal post and the third terminal post are all provided with terminal rings, and each terminal ring is connected to a wire.

7. The impedance detection based steam temperature control device of claim 6, wherein, Each terminal ring is provided with a welding hole.

8. The impedance detection based steam temperature control device of claim 1, wherein, The steam coil is made of 316L stainless steel.

9. The impedance detection based steam temperature control device according to any one of claims 1 to 8, characterized in that, The ablation handle comprises: a shell, the steam coil being arranged in the shell; an infusion tube, the infusion tube being communicated with the input section of the steam coil; a steam delivery needle, the steam delivery needle being arranged in the shell and being communicated with the output section of the steam coil, and being used for outputting steam; a trigger button, the trigger button being arranged in the shell and being used for triggering the output of steam from the steam delivery needle.

10. A steam temperature control method characterized by, The application of the impedance detection based steam temperature control device as claimed in any one of claims 1 to 9 comprises the following steps: in a preheating mode, heating sterile water to 90-95 degrees Celsius while pushing the sterile water to the steam coil; in a treatment mode, heating the sterile water in the steam coil into steam, the temperature of one end of the coil section adjacent to the output section being controlled at 135-145 degrees Celsius, and the ablation handle being controlled to output steam.

11. The steam temperature control method according to claim 10, characterized by, When the temperature of one end of the coil section adjacent to the output section is higher than an alarm temperature, the output of the power output module is turned off.

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