CN113397696A - Ablation needle - Google Patents

Abstract

The utility model provides an ablation needle, relates to medical instrument technical field, is provided with the inserting groove including play water tank and plug connector on the play water tank, and the plug connector is used for holding thermistor, and the plug connector can dismantle fixedly in inserting the inserting groove to make thermistor immerse under the liquid level of play water tank cooling liquid. The ablation needle can improve the accuracy of intraoperative temperature detection.

Description

Ablation needle

Technical Field

The invention relates to the technical field of medical instruments, in particular to an ablation needle.

Background

In the microwave ablation tumor treatment, microwaves are transmitted into tumor tissues through an ablation needle, so that the molecular motion is intensified to generate heat, and the cell nucleus and chromatin are coagulated by a thermal coagulation group, and the cell death is induced by protein coagulation and cell chromosome aberration. During the treatment process, the ablation temperature is ensured not to damage normal tissues while killing tumor cells, so that how to accurately monitor the temperature in the operation becomes the key of success or failure of the operation.

The traditional intraoperative temperature monitoring mode is matched with a microwave ablation instrument, a thermistor is fixedly arranged at the top of a water outlet tank, and the temperature of cooling water in the water tank is monitored in real time, so that the intraoperative temperature monitoring requirement is met. However, the traditional temperature monitoring method has obvious disadvantages: because the ablation needle is a disposable medical product and needs to be disinfected, recycled and harmlessly treated uniformly after being used, when different ablation needles are used, the temperature detection result measured by the thermistor of each ablation needle has inevitable deviation due to the fact that the thermistors in different ablation needles are different and the resistance values of different thermistors are different, and the accuracy of temperature monitoring in surgery is seriously influenced.

Disclosure of Invention

The invention aims to provide an ablation needle which can improve the accuracy of intraoperative temperature detection.

The embodiment of the invention is realized by the following steps:

the embodiment of the invention provides an ablation needle, which comprises a water outlet tank and a plug connector, wherein the water outlet tank is provided with a plug-in connection groove, the plug connector is used for accommodating a thermistor, and the plug connector is inserted into the plug-in connection groove and can be detachably fixed, so that the thermistor is immersed under the liquid level of cooling liquid in the water outlet tank. The ablation needle can improve the accuracy of intraoperative temperature detection.

Optionally, the plug connector has a first end and a second end opposite to each other, the first end of the plug connector penetrates through the plug groove and is immersed below the liquid level of the cooling liquid in the water outlet tank, and the plug connector is detachably fixed to the plug groove through the second end.

Optionally, a first thread is arranged on the second end of the plug connector, a second thread is arranged on the inner wall surface of the insertion groove, and the plug connector is in threaded connection with the insertion groove.

Optionally, the outer diameter of the first end portion is smaller than the inner diameter of the insertion groove, the outer diameter of the second end portion is larger than the inner diameter of the insertion groove, and the plug connector is in interference fit with the insertion groove.

Optionally, a side of the second end portion, which is away from the first end portion, is provided with a recess, and a sealant layer is filled between the recess and the insertion groove.

Optionally, the encapsulant layer is a solder layer.

Optionally, the ablation needle further comprises an outer tube, an inner tube, a coaxial cable, a needle head, a water inlet tank, a water inlet pipe, a water outlet pipe, a supply device and a negative pressure device, wherein the coaxial cable is arranged in the inner tube, the end part of the coaxial cable extends out of the inner tube, the inner tube is arranged in the outer tube, the end part of the inner tube extends out of the outer tube, a first gap formed between the coaxial cable and the inner tube at intervals is used as a first channel, a second gap formed between the inner tube and the outer tube at intervals is used as a second channel, the first channel is communicated with the second channel, the needle head extends into the outer tube to be fixed and is connected with the coaxial cable, the water inlet tank is fixedly sleeved outside the coaxial cable and the inner tube to form a first cavity with the inner tube, and the water outlet tank is fixedly sleeved outside the inner tube and the outer tube to form a second cavity with the outer tube, the water inlet pipe is communicated with the first cavity, the water outlet pipe is communicated with the second cavity, the supply device is communicated with the water inlet pipe and the water outlet pipe respectively, so that the supply device, the water inlet pipe, the first cavity, the first channel, the second cavity and the water outlet pipe are communicated in sequence to form a closed pipeline, and the negative pressure device is arranged in the closed pipeline and used for driving cooling liquid in the supply device to circularly flow in the direction from the water inlet pipe to the water outlet pipe.

Optionally, the ablation needle further comprises a radio frequency connector and a transition box, the radio frequency connector is connected with the coaxial cable, and the transition box is fixedly sleeved outside the radio frequency connector and the coaxial cable.

Optionally, an air bag is arranged on the water outlet pipe, and the air bag is made of transparent materials.

Optionally, the coaxial cable, the inner tube and the outer tube are coaxially arranged.

The embodiment of the invention has the beneficial effects that:

the ablation needle comprises an outlet tank and a plug connector, wherein the outlet tank is provided with a plug-in connection groove, the plug connector is used for accommodating the thermistor, and the plug connector is inserted into the plug-in connection groove and can be detached and fixed, so that the thermistor is immersed below the liquid level of cooling liquid in the outlet tank, the temperature of the cooling liquid in the outlet tank can be measured by the thermistor, and the purpose of temperature detection in the operation is further achieved. Because the plug connector can be dismantled fixedly with the inserting groove, consequently, when in actual use, the ablation needle that itself provided can insert the plug connector in the inserting groove, can also follow the inserting groove and take out the plug connector to make the thermistor in the plug connector can be used repeatedly, and then make same thermistor can cooperate different ablation needles to use in the art, solved different thermistors that melt the needle and use and the temperature measuring result that leads to has the problem of deviation, improved the accuracy of temperature measuring in the art.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of an ablation needle according to an embodiment of the present invention;

FIG. 2 is a second schematic structural view of an ablation needle according to an embodiment of the present invention;

FIG. 3 is a third schematic structural view of an ablation needle according to an embodiment of the present invention;

fig. 4 is a fourth schematic structural view of an ablation needle according to an embodiment of the present invention.

Icon: 100-an ablation needle; 10-an outer tube; 11-an inner tube; 111-a second channel; 12-a coaxial cable; 121 — a first channel; 13-a needle head; 14-a water inlet tank; 15-water outlet tank; 151-a plug groove; 16-a water inlet pipe; 17-a water outlet pipe; 18-a radio frequency connector; 19-a transition box; 20-plug connector; 21-a first end portion; 22-a second end; 23-a recess; 30-air bag.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and fig. 2, the present embodiment provides anablation needle 100, which includes awater outlet tank 15 and aninsertion component 20, wherein thewater outlet tank 15 is provided with aninsertion groove 151, theinsertion component 20 is used for accommodating a thermistor, and theinsertion component 20 is inserted into theinsertion groove 151 to be detachably fixed, so that the thermistor is immersed under the liquid level of a cooling liquid in thewater outlet tank 15. Theablation needle 100 can improve the accuracy of intraoperative temperature detection.

It should be noted that, as shown in fig. 1 and fig. 2, theablation needle 100 includes awater outlet tank 15, and aplug groove 151 is disposed on thewater outlet tank 15, so that the thermistor can extend into thewater outlet tank 15 through theplug groove 151 and contact with the cooling liquid in thewater outlet tank 15, so that the thermistor can measure the temperature of the cooling liquid in thewater outlet tank 15, thereby achieving the purpose of intraoperative temperature measurement. Theablation needle 100 further comprises aplug connector 20, wherein theplug connector 20 is used for accommodating the thermistor, so that an accommodating space is provided for the thermistor through theplug connector 20, and the thermistor is protected through theplug connector 20. Besides, the plug-inunit 20 can be inserted into the plug-inslot 151 and detachably fixed with the plug-inslot 151, so that when theablation needle 100 is discarded after being used, the plug-inunit 20 can be taken out of the plug-inslot 151, so that the thermistor in the plug-inunit 20 can be repeatedly used, and the same thermistor can be matched withdifferent ablation needles 100 for use in an operation.

Compared with the prior art in which different ablation needles are used, the temperature detection results measured by the thermistors of all the ablation needles are deviated due to the fact that the thermistors of different ablation needles are different and the resistance values of different thermistors are different, so that the accuracy of intraoperative temperature detection is seriously affected, theablation needle 100 provided by the utility model can insert theplug connector 20 into the plug-inslot 151 and take out theplug connector 20 from the plug-inslot 151, so that the thermistors in theplug connector 20 can be repeatedly used, the same thermistor can be matched withdifferent ablation needles 100 to be used in an operation, the problem that the temperature detection results are deviated due to the fact that different thermistors used bydifferent ablation needles 100 are different is solved, and the accuracy of intraoperative temperature detection is improved.

It should be noted that, when the thermistor is accommodated in theplug 20, the thermistor and theplug 20 may be fixed by medical adhesive in order to improve the stability of the thermistor. Theplug 20 needs to have good thermal conductivity so that the thermistor housed in theplug 20 can accurately obtain the temperature of the cooling liquid in theoutlet tank 15. For example, theplug 20 and thesocket 151 may be made of brass. When theplug 20 is inserted into theinsertion groove 151 and fixed, theinsertion groove 151 needs to be sealed to prevent the coolant in theoutlet tank 15 from flowing out through theinsertion groove 151.

Regarding the actual position of theinsertion groove 151, those skilled in the art should be able to make reasonable selection and design according to the actual situation, and no particular limitation is imposed herein. Illustratively, as shown in FIGS. 1 and 2, in this embodiment, theinsertion groove 151 is located at the bottom of theoutlet box 15. Of course, in other embodiments, theinsertion groove 151 may be located on the top or side wall of theoutlet tank 15, so that the thermistor can be immersed under the surface of the cooling fluid in theoutlet tank 15 when theplug 20 is inserted into theinsertion groove 151 and fixed detachably.

As mentioned above, theablation needle 100 comprises thewater outlet tank 15 and theplug connector 20, thewater outlet tank 15 is provided with the plug-ingroove 151, theplug connector 20 is used for accommodating the thermistor, and theplug connector 20 is inserted into the plug-ingroove 151 to be detachably fixed, so that the thermistor is immersed under the liquid level of the cooling liquid in thewater outlet tank 15, the temperature of the cooling liquid in thewater outlet tank 15 can be measured by the thermistor, and the purpose of intraoperative temperature detection is achieved. Because theplug connector 20 and the plug-ingroove 151 can be dismantled fixedly, therefore, in practical use, theablation needle 100 that provides per se can insert theplug connector 20 into the plug-ingroove 151, can also take out theplug connector 20 from the plug-ingroove 151, thereby make the thermistor in theplug connector 20 can be used repeatedly, and then make same thermistor can cooperatedifferent ablation needles 100 to use in the art, the problem that the temperature detection result that the thermistor thatdifferent ablation needles 100 used is different and leads to has the deviation has been solved, the accuracy of temperature detection in the art has been improved.

As shown in fig. 1 and 2, in the present embodiment, theplug 20 has afirst end 21 and asecond end 22 opposite to each other, thefirst end 21 of theplug 20 penetrates theinsertion groove 151 to be immersed under the surface of the cooling liquid in thewater tank 15, and theplug 20 is detachably fixed to theinsertion groove 151 by thesecond end 22.

Regarding the inner diameter of theplug 20, those skilled in the art should be able to make a reasonable choice and design according to the outer diameter of the thermistor, and there is no particular limitation. Regarding the outer diameter of thefirst end portion 21 of theplug 20, since thefirst end portion 21 of theplug 20 penetrates theinsertion groove 151 to be immersed under the surface of the cooling liquid in thewater tank 15, the outer diameter of thefirst end portion 21 needs to be smaller than the inner diameter of theinsertion groove 151, and regarding the outer diameter of thesecond end portion 22 of theplug 20, since theplug 20 is detachably fixed by being inserted into theinsertion groove 151, the outer diameter of thesecond end portion 22 may be larger than the inner diameter of theinsertion groove 151, so that theplug 20 and theinsertion groove 151 can be detachably fixed by interference fit.

However, when theplug 20 and theinsertion groove 151 are fixed by interference fit, taking out theplug 20 from theinsertion groove 151 is laborious, and even a serious person may damage theoutlet tank 15 and/or theplug 20, and therefore, in this embodiment, thesecond end 22 of theplug 20 is provided with a first thread (not shown in the figure), and the inner wall surface of theinsertion groove 151 is provided with a second thread (not shown in the figure), so that theplug 20 and theinsertion groove 151 can be detachably fixed by threaded connection.

Thus, when the plug-inunit 20 needs to be inserted into theinsertion groove 151 to be fixed, thefirst end portion 21 of the plug-inunit 20 is inserted into theinsertion groove 151, and then the plug-inunit 20 is screwed to thesecond end portion 22 to be in threaded connection with theinsertion groove 151; when the plug-inunit 20 needs to be taken out of theinsertion groove 151 to be released from the fixed state, the plug-inunit 20 is screwed in the opposite direction until thesecond end portion 22 is disconnected from theinsertion groove 151, and then thefirst end portion 21 of the plug-inunit 20 is taken out of theinsertion groove 151.

As shown in fig. 2, in the present embodiment, arecessed portion 23 is disposed on a side of thesecond end 22 away from thefirst end 21, and a sealant layer is filled between therecessed portion 23 and theinsertion groove 151 to further improve the sealing property between theinsertion member 20 and theinsertion groove 151, so as to further prevent the cooling liquid in theoutlet box 15 from flowing out through theinsertion groove 151. Illustratively, the encapsulant layer is a solder layer.

Thus, when theplug 20 needs to be inserted into theinsertion groove 151 to be fixed, thefirst end portion 21 of theplug 20 is inserted into theinsertion groove 151, theplug 20 is screwed to thesecond end portion 22 to be in threaded connection with theinsertion groove 151, and the sealant is filled between the recessedportion 23 and the insertion groove 151 (for example, the solder is melted and then solidified); when the plug-inunit 20 needs to be removed from theinsertion groove 151, the sealant is removed from between the recessedportion 23 and the insertion groove 151 (for example, the solder is melted again and removed), the plug-inunit 20 is screwed in the opposite direction until thesecond end 22 is disconnected from theinsertion groove 151, and thefirst end 21 of the plug-inunit 20 is removed from theinsertion groove 151.

As shown in fig. 1, in the present embodiment, the ablation needle 100 further includes an outer tube 10, an inner tube 11, a coaxial cable 12, a needle 13, a water inlet tank 14, a water inlet pipe 16, a water outlet pipe 17, a supply device and a negative pressure device, wherein the coaxial cable 12 is disposed in the inner tube 11 and the end portion of the coaxial cable extends out of the inner tube 11, the inner tube 11 is disposed in the outer tube 10 and the end portion of the inner tube extends out of the outer tube 10, a first gap formed between the coaxial cable 12 and the inner tube 11 is used as a first channel 121, a second gap formed between the inner tube 11 and the outer tube 10 is used as a second channel 111, the first channel 121 is communicated with the second channel 111, the needle 13 extends into the outer tube 10 and is fixed and connected to the coaxial cable 12, the water inlet tank 14 is fixedly sleeved outside the coaxial cable 12 and the inner tube 11 and forms a first chamber with the inner tube 11, the water outlet tank 15 is fixedly sleeved outside the inner tube 11 and the outer tube 10 and forms a second chamber with the outer tube 10, the water inlet pipe 16 is communicated with the first cavity, the water outlet pipe 17 is communicated with the second cavity, the supply device is communicated with the water inlet pipe 16 and the water outlet pipe 17 respectively, so that the supply device, the water inlet pipe 16, the first cavity, the first channel 121, the second channel 111, the second cavity and the water outlet pipe 17 are communicated in sequence to form a closed pipeline, and the negative pressure device is arranged in the closed pipeline and used for driving cooling liquid in the supply device to circularly flow in the direction from the water inlet pipe 16 to the water outlet pipe 17. Wherein,syringe needle 13 andouter tube 10 can adopt medical stainless steel to make to have better compatibility through medical stainless steel and human tissue, thereby avoid appearing adverse reactions such as rejection as far as possible,syringe needle 13 can be the triangular prism or the conical, thereby is convenient for puncture the affected part.

It should be noted that, in the microwave ablation tumor therapy, a large amount of heat may be generated around thecoaxial cable 12, in order to avoid injury to the patient and damage to the device itself, therefore, theablation needle 100 forms a closed pipeline by sequentially communicating the supply device, thewater inlet pipe 16, the first cavity, thefirst channel 121, thesecond channel 111, the second cavity and thewater outlet pipe 17, and drives the cooling liquid in the supply device to circularly flow along the direction from thewater inlet pipe 16 to thewater outlet pipe 17 through the negative pressure device, so that heat exchange is performed on thecoaxial cable 12 through the cooling liquid, and the temperature around thecoaxial cable 12 is further reduced. For example, since the specific heat capacity of water is large, the cooling liquid may be water, the supply device may be a water bottle, and the negative pressure device may be a negative pressure pump.

It should be noted that, in order to avoid leakage of the cooling water, the above-mentioned supply device, thewater inlet pipe 16, the first chamber, thefirst channel 121, thesecond channel 111, the second chamber and thewater outlet pipe 17 need to ensure their own sealing performance, and also need to ensure the sealing performance of the connection between the two, and those skilled in the art should be able to achieve the above-mentioned purpose by adding a sealing ring, filling a sealing agent, etc. according to actual situations, and will not be described in detail here.

As shown in fig. 1, in this embodiment, theablation needle 100 further includes aradio frequency connector 18 and atransition box 19, theradio frequency connector 18 is connected to thecoaxial cable 12, and thetransition box 19 is fixedly sleeved outside theradio frequency connector 18 and thecoaxial cable 12, so as to protect theradio frequency connector 18 and thecoaxial cable 12 through thetransition box 19. It should be noted that, in order to improve the heat exchange effect between the cooling liquid and thecoaxial cable 12, thewater inlet tank 14, thewater outlet tank 15, and thetransition tank 19 may be made of brass.

Referring to fig. 3, in the present embodiment, thecoaxial cable 12, theinner tube 11 and theouter tube 10 are coaxially disposed, so that heat exchange between the cooling liquid and thecoaxial cable 12 is more uniform, the temperature around thecoaxial cable 12 can be more uniformly reduced, and the stability of theablation needle 100 during the use process is further improved.

The traditional temperature monitoring method has the following disadvantages: the temperature of cooling water can be judged only by matching with a microwave ablation instrument, the detection accuracy of the instrument and the stability of a thermistor are extremely depended on, and the reliability of temperature monitoring in the operation is seriously influenced.

Therefore, referring to fig. 4 again, in the present embodiment, theair bag 30 is disposed on thewater outlet pipe 17, theair bag 30 is made of a transparent material, when theablation needle 100 is in normal operation, liquid droplets in theair bag 30 can drop at a constant speed, the inner wall of theair bag 30 is transparent and visible, and when theablation needle 100 is in abnormal operation (when the temperature of the coolant is too high), the coolant is vaporized due to the too high temperature and adheres to the inner wall of theair bag 30, so that the inner wall of theair bag 30 generates water mist. Wherein, optionally, the diameter of theballoon 30 is between 15mm and 25mm, for example, the diameter of theballoon 30 is 15mm, 18mm, 20mm, 22mm or 25mm, etc.

Therefore, a doctor can observe water drops in theair bag 30 through naked eyes in an operation, directly judges whether cooling liquid in the circulating pipeline normally flows, can also observe whether water mist appears on the inner wall of theair bag 30 through the naked eyes in the operation, directly judges whether the cooling liquid in the circulating pipeline has the problem of temperature rise, so that effective measures can be taken timely, the problems of accuracy of a microwave ablation instrument, stability of a thermistor and the like do not need to be considered, and reliability of temperature detection in the operation is improved.

In summary, theablation needle 100 provided by the present application has dual temperature detection functions, namely a temperature detection function in which a traditional thermistor and a microwave ablation instrument are matched, and a temperature detection function in which a doctor directly determines through visual observation, so as to significantly improve the safety and reliability of the operation, and ensure that the doctor can find abnormal phenomena in the operation at the first time and take measures in time.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The ablation needle is characterized by comprising a water outlet tank and a plug connector, wherein the water outlet tank is provided with a plug-in connection groove, the plug connector is used for accommodating a thermistor, and the plug connector is inserted into the plug-in connection groove and can be detachably fixed, so that the thermistor is immersed under the liquid level of cooling liquid in the water outlet tank.

2. The ablation needle of claim 1, wherein the connector has first and second opposite ends, the first end of the connector penetrating the channel and being immersed below the level of cooling fluid in the outlet tank, the connector being removably secured to the channel by the second end.

3. The ablation needle of claim 2, wherein the second end of the connector is provided with a first thread and the inner wall of the insertion groove is provided with a second thread, the connector being in threaded connection with the insertion groove.

4. The ablation needle of claim 2, wherein an outer diameter of the first end portion is smaller than an inner diameter of the insertion groove, an outer diameter of the second end portion is larger than the inner diameter of the insertion groove, and the plug member is in interference fit with the insertion groove.

5. The ablation needle of any one of claims 2-4, wherein a side of the second end portion away from the first end portion is provided with a recess, and a sealant layer is filled between the recess and the insertion groove.

6. The ablation needle of claim 5, wherein the sealant layer is a solder layer.

7. The ablation needle according to claim 1, further comprising an outer tube, an inner tube, a coaxial cable, a needle head, a water inlet tank, a water inlet pipe, a water outlet pipe, a supply device and a negative pressure device, wherein the coaxial cable is disposed inside the inner tube and has an end portion extending out of the inner tube, the inner tube is disposed inside the outer tube and has an end portion extending out of the outer tube, a first gap formed between the coaxial cable and the inner tube at an interval serves as a first channel, a second gap formed between the inner tube and the outer tube at an interval serves as a second channel, the first channel is communicated with the second channel, the needle head extends into the outer tube and is fixed and connected with the coaxial cable, the water inlet tank is fixedly sleeved outside the coaxial cable and the inner tube and forms a first cavity with the inner tube, and the water outlet tank is fixedly sleeved outside the inner tube and the outer tube and forms a second cavity with the outer tube, the water inlet pipe is communicated with the first cavity, the water outlet pipe is communicated with the second cavity, the supply device is communicated with the water inlet pipe and the water outlet pipe respectively, so that the supply device, the water inlet pipe, the first cavity, the first channel, the second cavity and the water outlet pipe are communicated in sequence to form a closed pipeline, and the negative pressure device is arranged in the closed pipeline and used for driving cooling liquid in the supply device to circularly flow in the direction from the water inlet pipe to the water outlet pipe.

8. The ablation needle of claim 7, further comprising a radio frequency connector and a transition box, wherein the radio frequency connector is connected to the coaxial cable, and the transition box is fixedly sleeved outside the radio frequency connector and the coaxial cable.

9. The ablation needle of claim 7, wherein the water outlet pipe is provided with a balloon, and the balloon is made of a transparent material.

10. The ablation needle of claim 7, wherein the coaxial cable, the inner tube, and the outer tube are coaxially disposed.

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