Ablation device for cavity tissue and ablation needle matched with ablation device

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a cavity tissue ablation device and an adaptive ablation needle thereof.The cavity tissue ablation device comprises an ablation host and an ablation needle assembly, the ablation needle assembly comprises a holding handle, an ablation needle body and a tube body assembly, the ablation needle body is installed at one end of the holding handle, and the tube body assembly is installed at the bottom of the holding handle; the top end of the tube body assembly penetrates through the holding handle and is connected with one end of the ablation needle body; the ablation needle body comprises a puncture needle and an injection tube, the injection tube is arranged in the middle inside the puncture needle, and a first injection hole is formed in the outer side of one end of the injection tube. According to the ablation needle, a medium can be injected into a cavity of a focus through the injection pipe arranged in the ablation needle, and heat conduction is accelerated through the injected medium in the ablation process, so that the cooling speed of the cavity focus is increased, the cooling speed of the focus is increased, the ablation time is shortened, and the possibility that normal tissue is damaged is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a device for ablation of cavity tissue and an ablation needle adapted thereto. Background Art

[0002] Ablation is a treatment method that destroys tissues or cells through high-energy heat or cold sources. In the medical field, ablation is widely used to treat a variety of diseases, including tumors, arrhythmias, varicose veins, etc. Cryoablation is a new arrhythmia treatment technology invented by researchers after radiofrequency ablation. Its principle is to remove tissue heat through the heat absorption and evaporation of liquid refrigerant, so that the temperature of the target ablation site is reduced, and abnormal electrophysiological cell tissues are destroyed, thereby reducing the risk of arrhythmias. A large amount of clinical data shows that compared with traditional radiofrequency ablation, cryoablation is easier for doctors to operate, shortens the operation time, has high treatment effectiveness, reduces serious complications such as thrombosis, and reduces patient pain.

[0003] In the prior art, cryoablation involves the freezing zone of the ablation needle directly contacting the lesion area, rapidly cooling the lesion area through heat transfer, thereby extinguishing the cells in the lesion area. However, when cryoablation is performed on lesions with hollow tissue, the heat transfer rate is slowed down due to the structure of the cavity, which reduces the cooling rate of the lesion tissue, prolonging the cryoablation process and greatly increasing the possibility of damage to normal tissue near the lesion. Summary of the invention

[0004] The purpose of the present invention is to provide a device for ablation of cavity tissue and an ablation needle adapted thereto, which can inject a medium into the cavity of a lesion through an injection tube arranged inside the ablation needle. During the ablation process, the injected medium accelerates heat conduction, thereby accelerating the cooling rate of the cavity lesion, accelerating the cooling rate of the lesion, shortening the ablation time, and reducing the possibility of damage to normal tissue.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A device for ablation of cavity tissue and an ablation needle adapted thereto, comprising an ablation host and an ablation needle assembly, wherein the ablation needle assembly comprises a gripping handle, an ablation needle body and a tube assembly, wherein the ablation needle body is mounted at one end of the gripping handle, the tube assembly is mounted at the bottom of the gripping handle, and the top end of the tube assembly penetrates the gripping handle and is connected to one end of the ablation needle body;

[0007] The ablation needle body comprises a puncture needle and an injection tube, wherein the injection tube is arranged in the middle of the puncture needle, a first injection hole is arranged on the outside of one end of the injection tube, and a second injection hole is arranged on the outside of one end of the puncture needle, and the first injection hole and the second injection hole are connected through a connecting tube;

[0008] A storage box is provided at the bottom of the ablation mainframe, and a first medium storage tank, a second medium storage tank, a third medium storage tank and a waste recovery tank are provided inside the storage box. A connector is installed at one end of the storage box, and one end of the connector is connected to the tube body assembly;

[0009] A foot switch is installed at the bottom of the storage box.

[0010] In a preferred embodiment, a reflux hole is provided on the outside of the puncture needle and at a position at one end of the second injection hole, and a separator is provided inside the puncture needle. The separator is U-shaped, and two sides of the separator are respectively attached to the inner wall of the puncture needle and the outer wall of the injection tube. The separator, the inner wall of the puncture needle and the outer wall of the injection tube form a reflux channel, and the reflux hole is connected to the reflux channel.

[0011] In a preferred embodiment, the interior of the puncture needle is divided into a U-shaped medium flow channel by the outer wall of the provided partition sheet and the outer wall of the injection tube.

[0012] In a preferred embodiment, a thermal insulation outer sleeve is provided on the outside of the puncture needle, a vacuum insulation chamber is provided between the puncture needle and the thermal insulation outer sleeve, the thermal insulation outer sleeve is provided in an area on the outside of the puncture needle where a second injection hole and a return hole are not provided, and the area at the front end of the puncture needle where the thermal insulation outer sleeve is not provided is the ablation area.

[0013] In a preferred embodiment, the pipe body assembly includes a first medium delivery pipe, a second medium delivery pipe, a third medium delivery pipe and a waste return pipe, wherein the first medium delivery pipe, the second medium delivery pipe, the third medium delivery pipe and the waste return pipe are arranged side by side, one end of the third medium delivery pipe is connected to the other end of the injection pipe, and one end of the waste return pipe is connected to one end of the reflux channel.

[0014] In a preferred solution, the first medium delivery pipe is connected to an input end of the medium flow channel, and the second medium delivery pipe is connected to an output end of the medium flow channel.

[0015] In a preferred embodiment, the other end of the first medium delivery pipe is connected to the first medium storage tank, the other end of the second medium delivery pipe is connected to the second medium storage tank, the other end of the third medium delivery pipe is connected to the third medium storage tank, and the other end of the waste return pipe is connected to the waste recovery tank.

[0016] In a preferred embodiment, the holding handle includes a handle shell, one side of the handle shell is rotatably connected to four knobs, one end of the knob is fixed with a push column inside the handle shell, the outer side of the push column is threadedly connected to a closed slider, the closed slider is slidably connected to the handle shell, and the four closed sliders are respectively located on one side of the first medium delivery pipe, the second medium delivery pipe, the third medium delivery pipe and the waste return pipe.

[0017] In a preferred solution, a closed groove is provided inside the handle housing and at a position corresponding to each closed sliding block.

[0018] In a preferred embodiment, a scale is provided on the surface of the knob.

[0019] The technical effects achieved by the present invention are:

[0020] The present invention provides an injection tube inside the puncture needle and a connecting tube connecting the first injection hole and the second injection hole, so that the cavity lesion tissue can be filled with a filling medium before ablation, and then the filling medium is frozen during the freezing process, so that the filling medium acts as a carrier for heat conduction, which can greatly accelerate the cooling speed of the cavity lesion tissue, thereby reducing the time required for ablation and reducing the possibility of damage to normal tissue caused by ablation;

[0021] The present invention, through the reflux hole arranged on the outside of the puncture needle and the reflux channel arranged inside the puncture needle, can discharge the gas in the cavity lesion tissue while filling the filling medium into the cavity lesion tissue, so that the cavity lesion tissue is filled with the filling medium, avoiding the influence of the gas in the cavity lesion tissue on the efficiency of heat conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of the ablation needle assembly of the present invention;

[0024] Figure 3 It is a schematic diagram of the partial cross-sectional structure of one side of the ablation needle body of the present invention;

[0025] Figure 4 is a schematic diagram of a partial cross-sectional structure of the ablation needle body of the present invention when viewed from above;

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of one end of the ablation needle body of the present invention;

[0027] Figure 6 It is a schematic diagram of a partial cross-sectional structure of one side of the grip handle of the present invention;

[0028] Figure 7It is a schematic diagram of the cross-sectional structure of the grip handle of the present invention when viewed from above.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Ablation host; 2. Holding handle; 3. Ablation needle body; 4. Tube body assembly; 5. Connector; 6. Storage box; 7. Foot switch; 21. Handle housing; 22. Closed groove; 23. Closed slider; 24. Knob; 25. Push column; 31. Puncture needle; 32. Injection tube; 33. First injection hole; 34. Second injection hole; 35. Connecting tube; 36. Reflux hole; 37. Separator; 38. Insulating outer sleeve; 41. First medium delivery tube; 42. Second medium delivery tube; 43. Third medium delivery tube; 44. Waste reflux tube. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0035] Please see attached Figures 1 to 7 As shown, it is the first embodiment of the present invention, which provides a cavity tissue ablation device and an ablation needle adapted thereto, comprising an ablation host 1 and an ablation needle assembly, wherein the ablation needle assembly comprises a gripping handle 2, an ablation needle body 3 and a tube assembly 4, wherein the ablation needle body 3 is mounted at one end of the gripping handle 2, the tube assembly 4 is mounted at the bottom of the gripping handle 2, and the top end of the tube assembly 4 penetrates the gripping handle 2 and is connected to one end of the ablation needle body 3;

[0036] The ablation needle body 3 includes a puncture needle 31 and an injection tube 32. The injection tube 32 is arranged in the middle of the puncture needle 31. A first injection hole 33 is arranged on the outside of one end of the injection tube 32. A second injection hole 34 is arranged on the outside of one end of the puncture needle 31. The first injection hole 33 and the second injection hole 34 are connected through a connecting tube 35.

[0037] A storage box 6 is provided at the bottom of the ablation host 1, and a first medium storage tank, a second medium storage tank, a third medium storage tank and a waste recovery tank are provided inside the storage box 6. A connector 5 is installed at one end of the storage box 6, and one end of the connector 5 is connected to the tube assembly 4;

[0038] A foot switch 7 is installed at the bottom of the storage box 6;

[0039] In the above, the third medium storage tank stores a filling medium. When ablation of the cavity tissue is performed, the ablation needle 3 is inserted into the cavity lesion that needs to be ablated, and the filling medium in the third medium storage tank is transported to the cavity tissue through the injection tube 32, so that the cavity tissue is filled with the filling medium. At this time, the freezing medium stored in the first medium storage tank is transported to the ablation needle 3, so that the temperature of the area where the ablation needle 3 is located in the cavity lesion is rapidly reduced, and the heat of the filling medium is rapidly taken away to reach a frozen state, and the cavity lesion tissue is heat-conducted by the filling medium in the frozen state, which can quickly cool the cavity lesion tissue and achieve the purpose of cryoablation. The heat conduction speed through the filling medium can be greatly improved compared with the traditional gas heat conduction speed, which reduces the time required for cryoablation, can avoid damage to the patient's normal tissue due to long-term ablation, and can also reduce the patient's discomfort.

[0040] Furthermore, the filling medium may be one of physiological saline or blood.

[0041] In a preferred embodiment, please refer to Figure 4 and Figure 5 A reflux hole 36 is provided on the outside of the puncture needle 31 and at one end of the second injection hole 34. A separator 37 is provided inside the puncture needle 31. The separator 37 is U-shaped. Two sides of the separator 37 are respectively attached to the inner wall of the puncture needle 31 and the outer wall of the injection tube 32. The separator 37 and the inner wall of the puncture needle 31 and the outer wall of the injection tube 32 form a reflux channel. The reflux hole 36 is connected to the reflux channel.

[0042] In the above, a reflux channel is formed by the puncture needle 31, the injection tube 32 and the separator 37. In the process of delivering the filling medium to the cavity lesion tissue, the gas inside the cavity lesion tissue can enter the reflux channel through the reflux hole 36 and be discharged from the body. At the same time, the filling medium can also be discharged from the body through the reflux channel during the filling process. Continuous filling can ensure that the gas inside the cavity lesion tissue is completely discharged and the maximum efficiency of heat conduction is guaranteed. At the same time, after completing cryoablation, high-temperature gas can be introduced into the ablation needle body 3 to achieve the effect of quickly warming up the cryoablation area. During the warming process, the filling medium melts, and the filling medium inside the cavity lesion tissue can be extracted by negative pressure.

[0043] Next, please refer to Figure 3 and Figure 5 The interior of the puncture needle 31 is separated into a U-shaped medium flow channel by the outer wall of the partition sheet 37 and the outer wall of the injection tube 32;

[0044] As mentioned above, the two ends of the U-shaped medium circulation channel are respectively connected to the first medium storage tank and the second medium storage tank, wherein when the freezing medium in the first medium storage tank is transported to the U-shaped medium circulation channel, the surface temperature of the puncture needle 31 can be rapidly reduced, and through the heat transfer method, the heat of the filling medium filled in the cavity lesion tissue is absorbed by the puncture needle 31 and is taken away with the flow of the freezing medium, thereby completing the freezing of the filling medium, and rapidly reducing the temperature of the cavity lesion tissue to complete cryoablation, and the freezing medium that has completed heat absorption enters the second medium storage tank for recovery.

[0045] Secondly, please also refer to Figure 3 , Figure 4 and Figure 5 The outer side of the puncture needle 31 is provided with a heat-insulating outer sleeve 38, a vacuum temperature-insulating chamber is provided between the puncture needle 31 and the heat-insulating outer sleeve 38, the heat-insulating outer sleeve 38 is provided in the area on the outer side of the puncture needle 31 where the second injection hole 34 and the return hole 36 are not provided, and the area at the front end of the puncture needle 31 where the heat-insulating outer sleeve 38 is not provided is the ablation area;

[0046] As mentioned above, the thermal insulation outer sleeve 38 is made of insulation material, and the thermal insulation outer sleeve 38 wraps most of the area of ​​the puncture needle 31, and only the ablation area at the front end that contacts the lesion is not wrapped. This allows the ablation area at the front end to perform cryoablation normally, while the area at the rear end that contacts the normal human tissue is wrapped with the thermal insulation outer sleeve 38. The temperature of the puncture needle 31 is isolated by the thermal insulation outer sleeve 38, which can prevent the normal human tissue from being frostbitten. At the same time, a vacuum cavity is provided between the thermal insulation outer sleeve 38 and the puncture needle 31, which can better isolate the conduction of heat and provide better protection.

[0047] In a preferred embodiment, please refer again to Figure 2 The pipe body assembly 4 includes a first medium delivery pipe 41, a second medium delivery pipe 42, a third medium delivery pipe 43 and a waste return pipe 44. The first medium delivery pipe 41, the second medium delivery pipe 42, the third medium delivery pipe 43 and the waste return pipe 44 are arranged side by side, one end of the third medium delivery pipe 43 is connected to the other end of the injection pipe 32, one end of the waste return pipe 44 is connected to one end of the reflux channel, the first medium delivery pipe 41 is connected to the input end of the medium circulation channel, the second medium delivery pipe 42 is connected to the output end of the medium circulation channel, the other end of the first medium delivery pipe 41 is connected to the first medium storage tank, the other end of the second medium delivery pipe 42 is connected to the second medium storage tank, the other end of the third medium delivery pipe 43 is connected to the third medium storage tank, and the other end of the waste return pipe 44 is connected to the waste recovery tank;

[0048] In the above, the first medium delivery pipe 41 is connected to the first medium storage tank, and is used to deliver the freezing medium in the first medium tank to the medium circulation channel, so that the freezing medium flows in the puncture needle 31, and the puncture needle 31 is quickly frozen. The second medium delivery pipe 42 is connected to the second medium storage tank. The freezing medium flows in the medium circulation channel and flows out from the other end of the medium circulation channel into the second medium delivery pipe 42, and flows along the second medium delivery pipe 42 to the second medium storage tank to complete the recovery of the freezing medium. The third medium delivery pipe 43 is connected to the third medium storage tank. The third medium tank is filled with filling medium, which can be delivered to the injection pipe 32 through the third medium delivery pipe 43, and the filling medium is delivered to the cavity lesion. The waste reflux pipe 44 is connected to the waste recovery tank. When the filling medium is delivered to the cavity lesion, the gas in the cavity lesion can be discharged along the reflux channel, and the reflux channel is connected to the waste reflux pipe 44, so that the gas and the excess filling medium can flow into the waste recovery tank together.

[0049] In a preferred embodiment, please refer to Figure 6 and Figure 7 The gripping handle 2 includes a handle housing 21, one side of which is rotatably connected to four knobs 24, one end of the knob 24 is fixed with a push column 25 located inside the handle housing 21, the outer side of the push column 25 is threadedly connected to a closed slider 23, the closed slider 23 is slidably connected to the handle housing 21, and the four closed sliders 23 are respectively located on one side of the first medium delivery pipe 41, the second medium delivery pipe 42, the third medium delivery pipe 43 and the waste return pipe 44, and a closed groove 22 is provided inside the handle housing 21 and at a position corresponding to each closed slider 23, and a scale is provided on the surface of the knob 24;

[0050] In the above, by rotating the knob 24, the closed slider 23 can be pushed to move under the limitation of the thread and the handle shell 21 on the closed slider 23, and because the closed groove 22 and the closed slider 23 are respectively located on both sides of the first medium delivery pipe 41, the second medium delivery pipe 42, the third medium delivery pipe 43 and the waste return pipe 44, the closed slider 23 can be pushed to bend during its movement, thereby reducing the flow speed of the medium or blocking the flow of the medium, thereby achieving the effect of adjusting the flow speed and flow pressure of the medium, and the scale set on the surface of the knob 24 can accurately display the flow effect of the medium in the current state, and the adjustment position is at the holding handle 2, which can also be more convenient to operate.

[0051] The working principle of the present invention is as follows: during ablation, after determining the lesion area, the ablation needle body 3 is inserted into the lesion area, and then the filling medium is delivered to the injection tube 32 through the third medium storage tank, and is filled into the cavity lesion through the second injection hole 34 outside the puncture needle 31. At this time, the original air in the cavity lesion is squeezed to the reflux hole 36 and discharged from the body along the reflux channel. When the cavity lesion is filled with the filling medium, the delivery of the medium can be stopped, and the corresponding closing slider 23 can be moved by rotating the knob 24 to deliver the filling medium and fill the cavity lesion. The third medium delivery pipe 43 for medium reflux and the waste return pipe 44 are closed together. At this time, the first medium storage tank is started to transport the freezing medium to the medium flow channel in the puncture needle 31. During the flow process, the surface heat of the puncture needle 31 can be continuously taken away, thereby reducing the temperature of the puncture needle 31, and at the same time, the temperature of the filling medium is reduced and frozen. The frozen filling medium is used as a heat conduction carrier to accelerate the transfer of heat, so that the temperature of the lesion area can be quickly reduced to reach the temperature required for ablation, accelerate the time required for ablation, and reduce the possibility of ablation causing damage to normal human tissues.

[0052] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A device for ablation of cavity tissue and an ablation needle adapted therefor, characterized in that: The invention comprises an ablation main unit (1) and an ablation needle assembly, wherein the ablation needle assembly comprises a gripping handle (2), an ablation needle body (3) and a tube body assembly (4), wherein the ablation needle body (3) is mounted on one end of the gripping handle (2), the tube body assembly (4) is mounted on the bottom of the gripping handle (2), and the top end of the tube body assembly (4) passes through the gripping handle (2) and is connected to one end of the ablation needle body (3); The ablation needle body (3) comprises a puncture needle (31) and an injection tube (32), wherein the injection tube (32) is arranged in the middle of the puncture needle (31), a first injection hole (33) is arranged on the outside of one end of the injection tube (32), and a second injection hole (34) is arranged on the outside of one end of the puncture needle (31), and the first injection hole (33) and the second injection hole (34) are connected via a connecting tube (35); A storage box (6) is provided at the bottom of the ablation main unit (1), and a first medium storage tank, a second medium storage tank, a third medium storage tank and a waste recovery tank are provided inside the storage box (6). A connector (5) is installed at one end of the storage box (6), and one end of the connector (5) is connected to the tube body assembly (4); A foot switch (7) is installed at the bottom of the storage box (6).

2. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 1, characterized in that: A reflux hole (36) is provided on the outside of the puncture needle (31) and at a position at one end of the second injection hole (34). A separator (37) is provided inside the puncture needle (31). The separator (37) is in a U-shape. Two sides of the separator (37) are respectively in contact with the inner wall of the puncture needle (31) and the outer wall of the injection tube (32). The separator (37) and the inner wall of the puncture needle (31) and the outer wall of the injection tube (32) form a reflux channel. The reflux hole (36) is connected to the reflux channel.

3. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 2, characterized in that: The interior of the puncture needle (31) is divided into a U-shaped medium flow channel by the outer wall of the provided partition sheet (37) and the outer wall of the injection tube (32).

4. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 3, characterized in that: The outer side of the puncture needle (31) is provided with a heat-insulating outer sleeve (38), a vacuum temperature-insulating chamber is provided between the puncture needle (31) and the heat-insulating outer sleeve (38), the heat-insulating outer sleeve (38) is provided in an area on the outer side of the puncture needle (31) where the second injection hole (34) and the return hole (36) are not provided, and the area at the front end of the puncture needle (31) where the heat-insulating outer sleeve (38) is not provided is the ablation area.

5. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 3, characterized in that: The pipe body assembly (4) comprises a first medium delivery pipe (41), a second medium delivery pipe (42), a third medium delivery pipe (43) and a waste return pipe (44); the first medium delivery pipe (41), the second medium delivery pipe (42), the third medium delivery pipe (43) and the waste return pipe (44) are arranged side by side; one end of the third medium delivery pipe (43) is connected to the other end of the injection pipe (32); and one end of the waste return pipe (44) is connected to one end of the return channel.

6. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 5, characterized in that: The first medium delivery pipe (41) is connected to the input end of the medium circulation channel, and the second medium delivery pipe (42) is connected to the output end of the medium circulation channel.

7. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 5, characterized in that: The other end of the first medium delivery pipe (41) is connected to the first medium storage tank, the other end of the second medium delivery pipe (42) is connected to the second medium storage tank, the other end of the third medium delivery pipe (43) is connected to the third medium storage tank, and the other end of the waste return pipe (44) is connected to the waste recovery tank.

8. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 5, characterized in that: The holding handle (2) comprises a handle housing (21), one side of the handle housing (21) is rotatably connected to four knobs (24), one end of the knob (24) is fixed with a push column (25) located inside the handle housing (21), the outer side of the push column (25) is threadedly connected to a closed slider (23), the closed slider (23) is slidably connected to the handle housing (21), and the four closed sliders (23) are respectively located on one side of the first medium delivery pipe (41), the second medium delivery pipe (42), the third medium delivery pipe (43) and the waste return pipe (44).

9. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 8, characterized in that: A closed groove (22) is provided inside the handle housing (21) and at a position corresponding to each closed sliding block (23).

10. The device for ablation of cavity tissue and the ablation needle adapted therefor according to claim 8, characterized in that: The surface of the knob (24) is provided with a scale.

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