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

Abstract

The invention relates to the technical field of medical instruments, and provides a steam temperature control device and method based on impedance detection, and 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 used for heating sterile water into steam, the steam coil comprises an input section, a coil section, an output section, a first binding post, a second binding post and a third binding 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 a handle is burnt due to protection lag caused by time delay of temperature measurement is solved, and the temperature of the steam coil is controlled directly in a closed-loop mode. The consistency of steam heat output by the ablation handle is improved, and the consistency of ablation operations is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a steam temperature control device and a steam temperature control method based on impedance detection. Background Art

[0002] During prostate water vapor ablation treatment, the steam needs to be accurately controlled to avoid excessive steam overflow and burns to the urethra and other healthy tissues in the prostate, while also avoiding too little steam heat, which leads to poor treatment results.

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

[0004] In addition, the temperature is measured by a K-type thermocouple welded on the steam coil. During the treatment control process, the steam power supply sends power, the steam sending tube is heated up, and the temperature change is measured by the thermocouple. The temperature of the steam sending tube is detected by the hot thermocouple, and there is a 2s-3s lag effect. As a result, the controller can only output constant power to the steam coil and cannot achieve a closed-loop temperature adjustment for the steam coil through temperature. This causes fluctuations in the heat output of water vapor in the steam coil and unstable surgical treatment effects.

[0005] In addition, there is a 2s-3s lag effect from the time the steam coil heats up to the time the thermocouple detects the temperature change. When the control detects that the temperature exceeds the protection temperature, the temperature of the steam coil has already exceeded 3s ago, which can easily cause the thermal protection of the ablation handle to run away, thereby causing the ablation handle to burn out. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a steam temperature control device based on impedance detection, which aims to measure the temperature by detecting the impedance change of the steam coil, so as to ensure the stability of the steam heat output by the hot steam ablation device while reducing the cost.

[0007] The invention also provides a steam temperature control method.

[0008] The steam temperature control device based on impedance detection according to the first aspect of the present invention comprises: an ablation handle, the ablation handle being used to output steam; A steam coil, the steam coil is arranged on the ablation handle, the steam coil is used to heat sterile water into steam, the steam coil comprises 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; A steam temperature control system, 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, one end of the first circuit is connected to the power output module, and the other end is provided with a first port, one end of the second circuit is connected to the detection module, and the other end is provided with a second port, one end of the third circuit is connected to the power output module, and the other end is provided with a third port, the detection module is electrically connected to the first circuit and the third circuit respectively, the sampling resistor is provided 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 via a wire, the second port is connected to the second terminal via a wire, and the third port is connected to the third terminal via a wire.

[0009] According to the steam temperature control device based on impedance detection of the embodiment of the present invention, by setting the steam output temperature and then measuring the resistance of the steam coil to obtain the feedback temperature, a closed-loop control is performed to more stably control the temperature of the output steam. The temperature calculated by the resistance of the steam coil itself is the transmission of an electrical signal, which has a rapid response and strong controllability. Compared with measuring the steam coil with a thermocouple, there is no heat transfer delay and good real-time performance. The head temperature of the steam coil is closed-loop controlled, and the output steam heat is highly consistent, and the ablation effect is stable in prostate steam ablation. That is, by measuring the impedance of the steam coil to measure its temperature, the problem of the difficulty of welding and processing of K-type thermocouple wires and the problem of easy falling off after long-term placement, as well as the problem of burning the ablation handle due to the delay in thermocouple temperature measurement, is solved. By directly controlling the temperature of the steam coil in a closed-loop manner, the consistency of the steam heat output by the ablation handle is improved, and the consistency of the ablation surgery is improved.

[0010] According to an embodiment of the present invention, the third terminal is connected to an end of the coil segment adjacent to the output segment.

[0011] According to an embodiment of the present invention, the ratio of the resistance of the steam coil to the resistance of the wire is higher than 200:1.

[0012] 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.

[0013] According to an embodiment of the present invention, the steam temperature control system further comprises a controller, and the controller is electrically connected to the power output module and the detection module respectively.

[0014] According to an embodiment of the present invention, the first terminal, the second terminal and the third terminal are all provided with terminal rings, and each of the terminal rings is connected to one of the wires.

[0015] According to an embodiment of the present invention, each of the wiring rings is provided with a welding hole.

[0016] According to one embodiment of the present invention, the steam coil is made of 316L stainless steel.

[0017] According to one embodiment of the present invention, the ablation handle comprises: a shell, wherein the steam coil is disposed in the shell; a liquid infusion pipe, the liquid infusion pipe being connected to an input section of the steam coil; A steam delivery needle, which is disposed on the housing and connected to the output section of the steam coil for outputting steam; A trigger button is arranged on the shell and is used to trigger the steam to be output from the steam output needle.

[0018] According to the steam temperature control method of the second embodiment of the present invention, the steam temperature control device based on impedance detection is applied, and the steps include: In the preheating mode, the sterile water is heated to 90 degrees Celsius to 95 degrees Celsius, and the sterile water is pushed toward the steam coil; In treatment mode, the sterile water in the steam coil is heated into steam, the temperature of one end of the coil segment adjacent to the output segment is controlled at 135 degrees Celsius to 145 degrees Celsius, and the ablation handle is controlled to output steam.

[0019] According to an embodiment of the present invention, when the temperature of one end of the coil segment adjacent to the output segment is higher than an alarm temperature, the output of the power output module is turned off.

[0020] The steam temperature control method according to an embodiment of the present invention includes the above-mentioned steam temperature control device based on impedance detection, and therefore has all the technical effects of the above-mentioned steam temperature control device based on impedance detection, which will not be repeated here.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only 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.

[0023] Figure 1 It is a structural schematic diagram of a steam temperature control device based on impedance detection provided in an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the structure of the steam coil provided in an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the connection between the steam temperature control system and the steam coil circuit provided by an embodiment of the present invention.

[0026] Figure 4 The figure is a relationship diagram between the resistance and temperature of the steam coil of the steam temperature control device based on impedance detection provided by an embodiment of the present invention.

[0027] Figure 5 This is a relationship diagram between the head resistance and temperature of the steam coil of the steam temperature control device based on impedance detection provided by an embodiment of the present invention.

[0028] Figure 6 It is a control flow diagram of a steam temperature control device based on impedance detection provided in an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of a heating curve of a treatment mode of a steam temperature control device based on impedance detection provided in an embodiment of the present invention.

[0030] Figure 8 It is a schematic diagram of the working mode flow of the steam temperature control device based on impedance detection provided by an embodiment of the present invention.

[0031] Reference numerals: 11. Steam coil; 12. Infusion tube; 13. Trigger button; 14. Steam temperature control system; 15. Steam delivery needle; 23, first terminal; 25, second terminal; 27, third terminal; 21, output section; 22, coil section; 24, input section; 26, terminal ring; 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 DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0035] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Please refer to Figures 1 to 3 According to the first aspect of the present invention, the steam temperature control device based on impedance detection includes: an ablation handle, a steam coil 11, and a steam temperature control system 14.

[0038] like Figure 1 As shown, according to one embodiment of the present invention, the ablation handle is used to output steam, and the ablation handle includes a housing, an infusion tube 12, a steam delivery needle 15 and a trigger button 13. The steam coil 11 is arranged in the housing, and the steam temperature control system 14 is arranged 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 arranged in the housing and connected to the output section 21 of the steam coil 11 for outputting steam; the trigger button 13 is arranged 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 the sterile water to be delivered by the infusion tube 12 and input from the lower part of the steam coil 11. 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 delivery channel, in which sterile water is transported and heated into steam; the steam temperature control system 14 is a control panel installed in the steam ablation host, and the trigger button 13 is electrically connected to it through a wire for controlling the steam output.

[0039] like Figure 2As shown, the steam coil 11 is provided at the ablation handle, and 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. Exemplarily, the coil section 22 is formed by winding, and its two sections are respectively connected to the input section 24 and the output section 21, the input section 24 is provided with a liquid inlet, and the output section 21 is provided with a liquid outlet, the liquid inlet is used to connect the infusion tube 12 for conveying sterile water, and the upper liquid outlet is used to connect 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, so that the heating current can cover the entire steam coil 11 and improve the heating uniformity.

[0040] It should be noted that a section of the steam coil 11 between the first terminal 23 and the third terminal 27 is the head of the steam coil 11 and is used to measure the voltage at the head of the steam coil.

[0041] like Figure 3 As shown, a schematic diagram of the connection between the steam temperature control system 14 and the steam coil 11 is shown, and the steam temperature control system 14 is provided in the steam ablation host, wherein the electrical model 305 is a circuit model of the steam coil 11, which is used to represent the circuit connection relationship. It should be noted that the head resistor 306 is used to represent the resistance of a section of the steam coil 11 between the first terminal 23 and the third terminal 27, and the bottom resistor 307 is used to represent the resistance of a 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.

[0042] Exemplarily, 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 both 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, and the third port 309 is connected to the third terminal 27 through a wire.

[0043] That is, one end of the first circuit is led out from the power output module 302, and the other end is used to connect 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 the first circuit and the third circuit respectively, the sampling resistor 310 is provided in the third circuit, and both ends of the sampling resistor 310 are electrically connected to the detection module 303. Specifically, the first circuit is provided with a first port 304, and the first port 304 is connected to the first terminal 23 through a wire, the second circuit is provided with a second port 308, and the second port 308 is connected to the second terminal 25 through a wire, and the third circuit is provided with a third port 309, and the third port 309 is connected to the third terminal 27 through a wire.

[0044] The measurement process of the steam temperature control system 14: 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, and the connection relationship is as follows: Figure 3 As shown. The output current of the power output module 302 flows from the first port 304 through the first terminal 23, flows through the steam coil 11, flows out through the second terminal 25, and returns 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, the voltage between the first port 304 and the second port 308 as the head voltage V2 of the steam coil, and the current measured by the sampling resistor 310 is I; the ratio of V1 to the current I is calculated to obtain the overall resistance Rt of the steam coil 11, and the ratio of V2 to the current I is calculated to obtain the head resistance Rh of the steam coil 11.

[0045] The relationship between the resistance and temperature of the steam coil 11 is as follows: Figure 4 As shown, the resistance of the steam coil 11 at room temperature (20 degrees) is 1 ohm, and at 200 degrees Celsius it is 1.124 ohms; the relationship between the head resistance 306 of the steam coil 11 and the temperature; Figure 5 As shown, the head resistance of the steam coil 11 at room temperature (20 degrees) is 50 milliohms, and at 200 degrees Celsius it is 62.45 milliohms; through the steam temperature control system 14, the resistance of the steam coil 11 and the head resistance 306 measured can be used to calculate the overall temperature of the steam coil 11 and the head temperature of the steam coil 11. Of course, the resistance of the steam coil 11 varies according to the size, material and other structures of the steam coil 11. Specifically, the current temperature can be obtained by detecting the resistance of the steam coil 11 at room temperature and the change of its resistance with temperature, thereby achieving the purpose of temperature detection.

[0046] The relationship between the resistance and temperature of the 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 of the water vapor leaving the steam coil 11; and controls the temperature of the entire steam coil 11 to ensure the temperature of the sterile water in the steam coil 11. The resistance control flow chart of the steam coil 11 is shown in FIG. Figure 6 As shown, the temperature of the steam coil 11 is set according to the required steam temperature, and the target resistance of the coil to be controlled is obtained through the relationship between the coil temperature and the resistance; the resistance of the steam coil 11 is fed back by the measuring circuit, and the target resistance and the feedback resistance are input into the controller 301; the controller 301 is a closed-loop controller; the coil resistance feeds back the coil temperature in real time, and the overall loop speed is very high. The control adjustment frequency of the controller 301 can be very high, ensuring that the dynamic performance of the steam coil 11 is good and the stability is high. Thus, the stability of the heat output of the ablation handle and the consistency of the treatment effect are maintained; 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, thereby ensuring the stability of the output heat.

[0047] According to the steam temperature control device based on impedance detection of the embodiment of the present invention, by setting the steam output temperature, and then measuring the resistance of the steam coil 11 to obtain the feedback temperature, a closed-loop control is performed to more stably control the temperature of the output steam. The temperature calculated by the resistance of the steam coil 11 itself is the transmission of an electrical signal, which has a rapid response and strong controllability. Compared with measuring the steam coil 11 with a thermocouple, there is no heat transfer delay and good real-time performance. The head temperature of the steam coil 11 is closed-loop controlled, and the output steam heat is highly consistent, and the ablation effect is stable in prostate steam ablation. That is, by measuring the impedance of the steam coil 11 to measure its temperature, the problem of the difficulty of welding and processing of the K-type thermocouple wire and the problem of easy falling off after long-term placement, as well as the problem of burning the ablation handle due to the delay in thermocouple temperature measurement.

[0048] In one embodiment, the power output module 302 can be controlled by a DC voltage regulation mode or a voltage PWM mode. When the control mode is the DC voltage regulation mode, current sampling can be performed in the entire working cycle; when the voltage PWM mode is adopted, current sampling is performed in the working voltage open window; when the control mode is the DC voltage regulation mode, the DC voltage interference is small, which can improve the system EMC performance.

[0049] In one embodiment, the detection module 303 is a voltage and current measurement module, which is used to measure the voltage of the steam coil 11, the head voltage of the coil segment 22 and the current flowing through. The detection module 303 is a high-impedance input at the megohm level, which has a small shunt on the steam coil 11 and a small impact on the power output, thereby improving the measurement accuracy.

[0050] 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 conveying direction of the steam coil 11 is bottom-in and top-out, and the steam temperature control system 14 controls the sterile water at room temperature of 20 degrees Celsius to flow in from the lower liquid inlet, and after being heated by the steam coil 11, it becomes 103 degrees Celsius steam and flows out from the upper liquid outlet, so the temperature of the steam coil 11 from bottom to top is from low to high, and one 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 can control the final heating temperature of the steam. For this reason, 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 the coil segment 22 at 1 / 20 of the output segment 21, so as to measure the head voltage of the coil segment 22 and monitor the head temperature of the coil.

[0051] According to one embodiment of the present invention, the ratio of the resistance of the steam coil 11 to the resistance of the wire is higher than 200:1. For example, the wire connected to the terminal is No. 7 wire, preferably copper, and the total resistance of the wire is 4 milliohms. The steam coil 11 receives most of the electrical power. The wire consumes less resistance and shares less power, which is beneficial to reducing line heat and improving heating efficiency. The wire consumes less power, which reduces the impact of wire inconsistency on the entire system and is also beneficial to improving output consistency.

[0052] According to an embodiment of the present invention, at 20 degrees Celsius, the overall resistance of the steam coil 11 is 1 ohm, so as to facilitate parameter adjustment and implement temperature detection according to resistance changes.

[0053] According to an embodiment of the present invention, the steam temperature control system 14 further comprises a controller 301, which is electrically connected to the power output module 302 and the detection module 303. It can be understood that the controller 301 is used to control the power output module 302 and the detection module 303 to work or stop.

[0054] like Figure 2 As shown, according to an embodiment of the present invention, the first terminal 23, the second terminal 25 and the third terminal 27 are all provided with a wiring ring 26, and each wiring ring 26 is connected to a wire, which is convenient for wire connection and the connection is stable and reliable. Furthermore, each wiring ring 26 is provided with a welding hole to improve the convenience of connection.

[0055] 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 environment, 316L stainless steel shows 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 under high temperature conditions, 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.

[0056] Please refer to Figure 6 and Figure 8 According to the steam temperature control method of the second embodiment of the present invention, the steam temperature control device based on impedance detection is applied, and the steps include: In the preheating mode, sterile water is heated to 90 degrees Celsius to 95 degrees Celsius, and sterile water is pushed to the steam coil 11 at the same time; it can be understood that the preheating mode can be a standby mode, in which sterile water can be heated to 95 degrees, and sterile water is pushed to the steam coil 11 at a low speed and constant speed to maintain the pressure of the pipeline in the ablation handle to prevent back suction. When steam is needed, it can be quickly heated to form steam to reduce waiting time.

[0057] In the treatment mode, the sterile water in the steam coil 11 is heated into steam, the temperature of the end of the coil segment 22 adjacent to the output segment 21 is controlled at 135 degrees Celsius to 145 degrees Celsius, and the ablation handle is controlled to output steam. In the treatment mode, the head temperature of the coil segment 22 is controlled at 140 degrees, and the output steam temperature is 103 degrees. After the controller 301 is started, it enters the standby mode. After the standby mode is completed, it can be started to enter the treatment mode. After the treatment mode is completed, it returns to the standby mode. The controller 301 switches from the standby mode to the treatment mode, and the head of the steam coil 11 heats up rapidly, as shown in the curve. Figure 7 As shown, it rises to the specified temperature within 1.4 seconds, has a fast response speed, and can produce steam as soon as it is triggered.

[0058] According to one embodiment of the present invention, when the temperature of one end of the coil segment 22 adjacent to the output segment 21 is higher than the alarm temperature, the output of the power output module 302 is turned off. That is, when the temperature of the head of the steam coil 11 is higher than the alarm temperature, the protection mechanism is triggered, and the output of the power module is turned off to protect the steam coil 11. Compared with measuring the temperature of the steam coil 11 with a thermocouple, there is a delay of 2-3s when the heat of the steam coil 11 is transferred to the thermocouple, resulting in a protection lag. The temperature measurement using the resistance of the steam coil 11 itself is the transmission of electrical signals, there is no reaction delay problem, and the protection effect is good.

[0059] The steam temperature control method according to an embodiment of the present invention includes the above-mentioned steam temperature control device based on impedance detection, and therefore has all the technical effects of the above-mentioned steam temperature control device based on impedance detection, which will not be repeated here.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art 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 included in the scope of the claims of the present invention.

Claims

1. A steam temperature control device based on impedance detection, characterized in that: include: an ablation handle, the ablation handle being used to output steam; A steam coil, the steam coil is arranged on the ablation handle, the steam coil is used to heat sterile water into steam, the steam coil comprises 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; A steam temperature control system, 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, one end of the first circuit is connected to the power output module, and the other end is provided with a first port, one end of the second circuit is connected to the detection module, and the other end is provided with a second port, one end of the third circuit is connected to the power output module, and the other end is provided with a third port, the detection module is electrically connected to the first circuit and the third circuit respectively, the sampling resistor is provided 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 via a wire, the second port is connected to the second terminal via a wire, and the third port is connected to the third terminal via a wire.

2. The steam temperature control device based on impedance detection according to claim 1, characterized in that: The third terminal is connected to an end of the coil section adjacent to the output section.

3. The steam temperature control device based on impedance detection according to claim 1, characterized in that: The ratio of the resistance of the steam coil to the resistance of the wire is greater than 200:

1.

4. The steam temperature control device based on impedance detection according to claim 3, characterized in that: At 20 degrees Celsius, the overall resistance of the steam coil is greater than or equal to 1 ohm.

5. The steam temperature control device based on impedance detection according to claim 1, characterized in that: The steam temperature control system further includes a controller, which is electrically connected to the power output module and the detection module respectively.

6. The steam temperature control device based on impedance detection according to claim 1, characterized in that: The first connecting post, the second connecting post and the third connecting post are all provided with connecting rings, and each connecting ring is connected to one of the conducting wires.

7. The steam temperature control device based on impedance detection according to claim 6, characterized in that: Each of the wiring rings is provided with a welding hole.

8. The steam temperature control device based on impedance detection according to claim 1, characterized in that: The steam coil is made of 316L stainless steel.

9. The steam temperature control device based on impedance detection according to any one of claims 1 to 8, characterized in that: The ablation handle comprises: a shell, wherein the steam coil is disposed in the shell; a liquid infusion pipe, the liquid infusion pipe being connected to an input section of the steam coil; A steam delivery needle, which is disposed on the housing and connected to the output section of the steam coil for outputting steam; A trigger button is arranged on the shell and is used to trigger the steam to be output from the steam output needle.

10. A steam temperature control method, characterized in that: The steam temperature control device based on impedance detection according to any one of claims 1 to 9 is applied, the steps comprising: In the preheating mode, the sterile water is heated to 90 degrees Celsius to 95 degrees Celsius, and the sterile water is pushed toward the steam coil; In treatment mode, the sterile water in the steam coil is heated into steam, the temperature of one end of the coil segment adjacent to the output segment is controlled at 135 degrees Celsius to 145 degrees Celsius, and the ablation handle is controlled to output steam.

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

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