Ablation device with fixable end

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, and relates to an ablation device with a fixable end part, which comprises a holding part, an ablation part and a fixing part, one end of the ablation needle tube is connected with one end of the holding part, the ablation needle tube is provided with a second channel communicated with the first channel, a first insulating layer is arranged on the outer surface of the ablation needle tube, and the far-end part of the ablation needle tube is exposed to form an effective discharge length; the inner tube is movably arranged in the second channel of the ablation needle tube in a penetrating manner; at least one deformable claw part is formed at one end of the inner tube, the claw part can be contained in the second channel of the ablation needle tube, and after the claw part penetrates out of the second channel of the ablation needle tube, the claw part is scattered to form an anchoring structure. The deformable claw part is inserted into the tumor tissue in the opening process, the ablation needle tube and the tumor tissue are fixed, the tumor tissue and the ablation needle tube are kept at the preset positions all the time, target missing is avoided, secondary damage to normal tissue is avoided, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to an ablation device with a fixable end. Background Art

[0002] The application of pulsed electric field ablation technology in clinical practice is based on the electroporation effect of pulsed electric fields. Electroporation is divided into reversible electroporation and irreversible electroporation. Irreversible electroporation uses a stronger electric field to cause permanent permeability of the cell membrane and lead to cell death. Based on the theory of reversible electroporation, clinicians use high-field strength electric pulses to make drugs that are difficult to enter the lipid bilayer membrane easily enter the cell through the tiny pores of the cell membrane, thereby improving the efficacy. This method not only reduces the dosage of the drug, but also reduces certain toxic side effects due to the reduction in the dosage of the drug. This therapy is called electrochemotherapy and is currently mainly used for diseases such as cancer. Another medical application of reversible electroporation is the use of electroporation to introduce genes into cells or tissues for gene therapy and DNA vaccination.

[0003] When a traditional ablation needle is inserted into the human body for ablation, the organs in the human chest cavity will rise and fall due to the human body's breathing. Therefore, when the ablation needle is inserted into the lungs, liver and other organs for ablation, the position of the needle tip discharge may move up and down with the human body. If the needle tip position cannot be fixed well, on the one hand, the needle tip will move back and forth, and since the needle tip has very good sharpness, it will puncture the organ back and forth, causing secondary damage to the organ; on the other hand, during ablation, the needle tip may deviate from the predetermined position and then ablate at a non-lesion position, which will not only reduce the treatment effect and fail to completely ablate the tumor, but may also cause secondary damage to normal human tissues; therefore, it is necessary to make improvements. Utility Model Content

[0004] In order to solve the above problems in the prior art, the utility model provides an ablation device with a fixable end, which has a simple structure and strong practicality.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An ablation device with a fixable end, comprising:

[0007] A grip portion having a first passage extending therethrough;

[0008] An ablation needle tube having a first end and a second end, wherein the first end of the ablation needle tube is connected to one end of the holding portion, the ablation needle tube is provided with a second channel connected to the first channel, and the outer surface of the ablation needle tube is provided with a first insulating layer; the first insulating layer extends from the first end of the ablation needle tube to the second end to a preset length, so that a portion of the ablation needle tube close to the second end is exposed to form an effective discharge length;

[0009] The inner tube is movably arranged in the second channel of the ablation needle tube; at least one deformable claw is formed at one end of the inner tube away from the holding portion, and the claw can be received in the second channel of the ablation needle tube. When the claw passes through the second channel of the ablation needle tube, the claw spreads out to form an anchoring structure.

[0010] In some embodiments, a tip is provided at one end of the claw away from the inner tube.

[0011] In some embodiments, when the claws are spread out, the tips of the claws point toward one side of the inner tube.

[0012] In some embodiments, the holding portion includes a first shell, a support rod and a second shell, the first shell is provided with a first branch channel, the support rod is provided with a second branch channel, the second shell is provided with a third branch channel, the first shell is movably set at one end of the support rod through the first branch channel, the second shell is movably set at the other end of the support rod through the third branch channel, the first branch channel, the second branch channel and the third branch channel constitute the first channel, the first end of the ablation needle tube is connected to one end of the support rod, the second channel is connected to the second branch channel, and one end of the inner tube is connected to the second shell.

[0013] In some embodiments, an outer sheath is further included, wherein the outer sheath is movably arranged on the ablation needle tube, one end of the outer sheath is connected to the first shell, and the ablation needle tube can be received in the outer sheath.

[0014] In some embodiments, a puncture assembly is further included, wherein the puncture assembly includes a puncture needle having a needle head, the needle head is provided with a blade portion, and a needle cap is provided at one end of the puncture needle, wherein a third channel is provided in the inner tube, the needle head of the puncture needle passes through the third channel and out of the end of the inner tube provided with the claw portion, and the other end of the puncture needle is detachably connected to the second shell through the needle cap.

[0015] In some embodiments, it also includes a cable assembly that is detachably connected to the second shell, the cable assembly includes a needle core, a locking cap, and a cable electrically connected to the needle core, one end of the needle core can be inserted into the third channel of the inner tube and electrically connected to the ablation needle tube, the cable is connected to an external energy generator, and the cable assembly is detachably fixed to the second shell via the locking cap.

[0016] In some embodiments, a first threaded hole is provided on the first shell, a first locking screw is provided on the first threaded hole, and one end of the first locking screw can abut against or be separated from the support rod.

[0017] In some embodiments, a second threaded hole is provided on the second shell, a second locking screw is provided on the second threaded hole, and one end of the second locking screw can abut against or be separated from the support rod.

[0018] In some embodiments, a first limiting portion is provided on the support rod, one end of the first shell can abut against the first limiting portion, and one end of the second shell can abut against the first limiting portion.

[0019] In some embodiments, the support rod is provided with scale marks, and the scale marks are respectively located on both sides of the first limiting portion.

[0020] In some embodiments, one end of the support rod is adapted to the first sub-channel shape of the first shell, and the other end of the support rod is adapted to the third sub-channel shape of the second shell, wherein a second limiting portion is provided between the support rod and the first shell and the second shell respectively.

[0021] In some embodiments, the second limiting portion includes a second limiting groove axially distributed along the support rod and a second limiting boss respectively arranged on the first shell and the second shell, or a second limiting boss axially distributed on the support rod and a second limiting groove respectively arranged on the first shell and the second shell, and the first limiting boss is adapted to the first limiting groove.

[0022] In some embodiments, the claw is made of a memory alloy, and a second insulating layer is provided on the claw.

[0023] In some embodiments, the outer sheath, inner tube and ablation needle tube are all rigid structures.

[0024] Compared with the prior art, the beneficial effects brought by the utility model are:

[0025] The present application provides a deformable claw at one end of the ablation needle tube. When the second end of the ablation needle tube reaches the target tissue, the ablation needle tube is introduced into the target tissue through the puncture needle. Through the relative movement of the inner tube and the ablation needle tube, the claw received in the ablation needle tube opens to form an anchoring structure and is inserted into the target tissue, thereby fixing the ablation needle tube and the target tissue, so that the target tissue and the ablation needle tube remain relatively still at all times, avoiding the ablation needle tube from going off target. Compared with the traditional integrated structure of the ablation electrode and the puncture needle, the ablation efficiency is improved, and no secondary damage is caused to normal tissue, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 It is a structural exploded view of the ablation device with a fixed end portion of the utility model;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the ablation device with a fixable end portion of the utility model;

[0029] Figure 3 It is a structural cross-sectional view of the ablation device with a fixed end portion of the utility model;

[0030] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0031] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0032] Figure 6 This is a diagram of the first state of the ends of the ablation needle tube, the outer sheath tube and the inner tube of the utility model;

[0033] Figure 7 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0034] Figure 8 This is a diagram of the end states of the ablation needle tube, outer sheath tube and puncture needle of the utility model;

[0035] Fig. 9 It is a schematic diagram of the three-dimensional structure of the first shell of the utility model;

[0036] Fig.10 It is a three-dimensional structural schematic diagram of the support rod of the utility model;

[0037] Fig.11 It is a schematic diagram of the three-dimensional structure of the second shell of the utility model;

[0038] Fig.12 It is a structural schematic diagram of the cable assembly of the utility model. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0040] An ablation device with a fixed end according to an embodiment of the present application is as follows: Figure 1 , Figure 2 and Figure 3 As shown, it comprises: a holding portion 1, wherein the holding portion 1 has a first channel running through it; one end of the holding portion 1 is connected to an ablation needle tube 123, wherein the ablation needle tube 123 has a first end and a second end, as shown in FIG. Figure 5 As shown, the first end of the ablation needle tube 123 is connected to the holding portion, as shown in FIG. Figure 6 As shown, the ablation needle tube 123 is provided with a second channel 1231 connected to the first channel, and the outer surface of the ablation needle tube 123 is provided with a first insulating layer 1232; the first insulating layer 1232 extends from the first end of the ablation needle tube 123 to the second end to a preset length, as shown in FIG. Figure 7 As shown, the ablation needle tube 123 is partially exposed near the second end to form an effective discharge length L. In this embodiment, the effective discharge length L is preset according to actual needs.

[0041] The inner tube 133 is movably arranged in the second channel 1231 of the ablation needle tube 123; one end of the inner tube 133 away from the holding portion 1 is formed with one or more deformable claws 1332, and the claws 1332 are made of memory alloy material, such as nickel-titanium alloy; therefore, the claws 1332 are in a contracted tubular structure when in the second channel 1231 of the ablation needle tube 123; the claws 1332 are released and opened after passing through the second channel 1231 of the ablation needle tube 123, and multiple claws 1332 are spread out to form an anchoring structure. In this embodiment, the anchoring structure is an umbrella-shaped structure, or the claws 1332 are in a vertical state with the ablation needle tube 123, and the anchoring effect is better at this time.

[0042] Furthermore, if Figure 7As shown, a tip 13321 is provided at the end of each claw 1332, so that when the claw 1332 is opened, it is inserted into the tumor tissue to fix the ablation needle tube 123 and the tumor tissue; further, the outer surface of the claw 1332 has a second insulating layer to prevent the claw 1332 from losing energy or causing tip discharge, and the second insulating layer can be formed of materials such as parylene coating or polyimide coating formed by heat shrinkage or heat shrinkable polyethylene terephthalate. Furthermore, in order to achieve a better anchoring effect of the claw 1332, the tip 13321 of the claw 1332 points to one side of the inner tube 133 when it is spread out, so that the angle between the claw 1332 and the inner tube 133 is smaller, and the anchoring structure is more stable.

[0043] In one embodiment, Figure 9-11 As shown, the holding portion 1 includes a first shell 11, a second shell 13 and a support rod 12. A first sub-channel 111 is arranged on the first shell 11, a third sub-channel 131 is arranged on the second shell 13, and a second sub-channel 122 is arranged on the support rod 12. The first shell 11 is movably arranged at the first end of the support rod 12 through the first sub-channel 111, and the second shell 13 is movably arranged at the other end of the support rod 12 through the third sub-channel 131. Specifically, the first sub-channel 111 passes through both ends of the first shell 11, the third sub-channel 131 passes through both ends of the second shell 13, and the second sub-channel 122 passes through both ends of the support rod 12, wherein the first sub-channel 111 and the third sub-channel 131 have similar structures, the first sub-channel 111 forms a smaller through hole at one end of the first shell 11 for setting the pipe fittings, and the third sub-channel 131 forms a smaller through hole at one end of the second shell 13 for pre-setting the cables. It should be pointed out that the first sub-channel 111, the second sub-channel 122 and the third sub-channel 131 form the first channel of the holding part 1, wherein the central axes of the first sub-channel 111, the second sub-channel 122 and the third sub-channel 131 are on the same axis to facilitate the insertion operation of the needle core and the puncture needle 23. In this embodiment, the first end of the ablation needle tube 123 is connected to one end of the support rod 12, the second channel 1231 of the ablation needle tube 123 is connected to the second branch channel 122 of the support rod 12, and one end of the inner tube 133 is connected to the second shell 13. The second shell 13 is moved in the relative axial direction relative to the support rod 12, so that the inner tube 133 and the ablation needle tube 123 move relative to each other, so that the claw 1332 at the distal end of the inner tube 133 is extended out or received in the second channel 1231 of the ablation needle tube 123.

[0044] In one embodiment, the ablation device further comprises a puncture assembly, again referring to Figure 1The puncture group 2 includes a puncture needle 23 and a needle cap 22, wherein the puncture needle 23 has a needle head 21, and a blade for cutting and puncturing is provided at the needle head 21, and the needle cap 22 is arranged at the other end of the puncture needle 23. In this embodiment, Figure 6 As shown, a third channel 1331 is provided on the inner tube 133, and the needle 21 of the puncture needle 23 passes through the third channel 1331 from one end of the inner tube 133 and passes through the end of the inner tube 133 provided with a claw 1332. The puncture needle 23 can move axially relative to the inner tube 133, and the puncture needle 23 is detachably provided at one end of the second housing 13 through the needle cap 22. Specifically, a joint 134 of a tubular boss is provided at one end of the second housing 13 away from the support rod 12, and the joint 134 is used for detachable connection with the needle cap 22. In this embodiment, the joint 134 is a Luer joint, which meets the requirements of GB / T 1962.1 or GB / T1962.2. Optionally, an external thread can be provided at the joint 134, and an internal thread for detachable connection can be provided on the needle cap 22, and the puncture assembly 2 can be detachably connected through threaded matching.

[0045] In one embodiment, Figure 4 As shown, the ablation device is also provided with an outer sheath 113, one end of which is connected to the first housing 11, and the outer sheath 113 is provided to cover the outer side of the ablation needle tube 123, wherein the ablation needle tube 123 and the outer sheath 113 can move relative to each other axially. When the puncture assembly 2 is fixed to one end of the second housing 13 by the needle cap 22, and the outer sheath 113 is in the initial position, the needle head 21 of the puncture needle 22 is stored in the outer sheath 113, as shown in FIG. Figure 6 As shown, Figure 8 As shown, when the first shell 11 moves axially relative to the support rod 12, the outer sheath 113 moves axially relative to the ablation needle tube 123, so that the needle head 21 of the puncture needle 23 is exposed outside the outer sheath 113, thereby puncturing the target tissue.

[0046] In one embodiment, the ablation device further comprises a cable assembly 3 detachably connected to the second housing 13, such as Fig.12As shown, the cable assembly 3 includes a needle core 31, a locking cap 32, and a cable 33 electrically connected to the needle core 31. One end of the needle core 31 can be inserted into the third channel 1331 of the inner tube 133 to be electrically connected to the ablation needle tube 123. The cable 33 is used to communicate with the external energy generator. The cable assembly 1 is detachably connected to one end of the second shell 13 through the locking cap 32. Specifically, at this time, the ablation needle tube 123 is a metal conductive structure, and the inner tube 133 is also a metal conductive structure. At the same time, the claw 1332 of the inner tube 133 is insulated, for example, an insulating coating is provided. One end of the inner tube 133 is inserted into the third channel of the inner tube through the needle core to transmit the ablation energy. It should be particularly pointed out that the locking cap 32 and the needle cap 22 are fixed in the same way, and the two can share a tubular boss structure joint 134 in the aforementioned embodiment to improve the adaptability of the cable assembly 3 and the puncture assembly 2.

[0047] In one embodiment, Fig. 9 As shown, a first threaded hole 114 is provided on the first shell 11, and a matching first locking screw 112 is provided on the first threaded hole 114. By rotating the first locking screw 112, one end of the first locking screw 112 can abut against or disengage from the support rod 12, thereby achieving the fixing of the position of the first shell 11 or achieving relative movement between the first shell 11 and the support rod 12, thereby adjusting and fixing the position of the needle 21 relative to the distal end of the outer sheath 113.

[0048] In one embodiment, Fig.11 As shown, a second threaded hole 135 is provided on the second shell 13, and a matching second locking screw 132 is provided on the second threaded hole 135. By rotating the second locking screw 132, one end of the second locking screw 132 can abut against or disengage from the support rod 12, thereby achieving the fixing of the position of the second shell 13 or achieving relative movement between the second shell 13 and the support rod 12, so that the claw 1332 extends out of the ablation needle tube 123 or is received in the ablation needle tube 123 and fixed.

[0049] In one embodiment, Fig.10 As shown, a scale mark 124 is provided on the support rod 12, which is used to determine the position of the first shell 11 and the second shell 13 relative to the support rod 12, thereby determining the position of the needle 21 relative to the outer sheath 113 and determining the position of the claw 1332 relative to the second end of the ablation needle tube 123, thereby determining whether the needle 21 is received or extended in the outer sheath 113, and confirming whether the claw 1332 is extended or received in the ablation needle tube 123. In this embodiment, two scale marks 124 are provided on the support rod 12, and in the initial position, the first shell 11 and the second shell 13 are respectively located at the 0 mark of the corresponding scale mark 124.

[0050] Further, in order to limit the first shell 11 and the second shell 13 in the axial direction of the support rod 12, a first limiting portion 121 is provided on the support rod 12. In this embodiment, the first limiting portion 121 is located in the middle of the support rod 12, and one end of the first shell 11 and one end of the second shell 12 can both abut against the first limiting portion 121. Specifically, in this embodiment, the first limiting portion 121 is an annular boss structure. Optionally, the first limiting portion 121 can be a columnar structure with point distribution, etc.

[0051] In one embodiment, since the first shell 11 and the second shell 13 both need to move axially relative to the support rod 12, and the inner tube 133 is connected to the second shell 13, and the outer sheath 113 is connected to the first shell 11, in order to prevent the first shell 11 and the second shell 13 from rotating during the axial relative movement, a second limiting portion is provided between the first shell 11 and the support rod 12 and between the second shell 13 and the support rod 12, and the second limiting portion is used for radial rotation limiting. Further, the second limiting portion includes a second limiting groove 125 provided on the support rod 12 and a second limiting boss 115 provided on the first shell 11 and the second shell 13, respectively. Specifically, the second limiting groove 125 is provided in two sections, and is provided on both sides of the first limiting portion 121. The second limiting boss 115 is a structure protruding from the inner wall of the first shell 11, and its outer shape structure is adapted to the second limiting groove 125. Similarly, the second limiting boss 115 located on the second shell 13 has the same structure. Optionally, as a variation of this embodiment, the first limiting groove 125 may be respectively disposed on the inner wall of the first shell 11 and the inner wall of the second shell 13 , and the second limiting boss 115 may be disposed on the support rod 12 .

[0052] During operation, the ablation device passes through the endoscope, and when it reaches the designated position through the bronchus, the ablation device is inserted through the working channel of the endoscope; before entering the endoscope, first: the puncture needle 23 is matched with the third channel 1331 of the inner tube 133 through the first channel. At this time, the needle head 21 of the puncture needle 23 is located at the second end of the ablation needle tube 123, and the needle head 21 does not leak out; when the front end of the outer sheath tube 113 reaches the designated position, unscrew the first locking screw 112, and move the first shell 11 backward. Since the outer sheath tube 113 is fixedly connected to the first shell 11, the outer sheath tube 113 moves backward, and at this time the ablation needle tube 123 and the needle head 21 of the puncture needle 23 are exposed.

[0053] Further, the support rod 12 and the second shell 13 are pushed at the same time, and the puncture needle 23 and the ablation needle tube 123 penetrate the tracheal wall and enter the tissue; further, when the ablation needle tube 123 reaches the specified position, the first locking screw 112 is rotated to fix the first shell 11 and the support rod 12; the puncture needle 23 is pulled out, and then the second locking screw 132 is loosened, and the second shell 13 is pushed. Since the second shell 13 is fixedly connected to the inner tube 133, the claw 1332 of the inner tube 133 extends out of the ablation needle tube 123. Since the claw 1332 is made of a memory alloy The material is made of nickel-titanium, so the claw 1332 will release and open to form a dispersed anchoring structure, and a sharp tip 13321 is made at the end of each claw 1332, so that the claw 1332 is inserted into the tumor tissue during the opening process to fix the ablation needle tube 123 and the tumor tissue; further, the conductive needle core 31 of the cable assembly 3 is inserted into the third channel 1331 of the inner tube 133, and locked with the joint 134 through the locking cap 32; then the cable 33 at the other end of the conductive needle core 31 is connected to the energy generator to perform tumor ablation.

[0054] As another variant implementation of this embodiment, the outer sheath, the inner tube and the ablation needle tube can also be a rigid structure that cannot be bent. By adopting a rigid structure design for the ablation needle tube, the inner tube and the outer sheath, in vitro subcutaneous puncture can be directly achieved.

[0055] Furthermore, the locking cap 32 and the connector 134 are both Luer connectors that meet the requirements of GB / T 1962.1 or GB / T 1962.2.

[0056] Furthermore, when ablation is completed, first remove the cable assembly 3, then rotate the second locking screw 112 to loosen the holding part 1 and the second shell 33, and then push the second shell 33 backward to retract the claw 1332 of the inner tube 133 into the ablation needle tube 123; then loosen the first locking screw 112, push the first shell 11 forward, retract the ablation needle tube 123 into the outer sheath 113, and then withdraw the ablation device.

[0057] The above is only a preferred embodiment of the present invention. It should be noted that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. An ablation device with a fixable end, characterized in that: include: A grip portion having a first passage extending therethrough; An ablation needle tube having a first end and a second end, wherein the first end of the ablation needle tube is connected to one end of the holding portion, the ablation needle tube is provided with a second channel connected to the first channel, and the outer surface of the ablation needle tube is provided with a first insulating layer; the first insulating layer extends from the first end of the ablation needle tube to the second end to a preset length, so that a portion of the ablation needle tube close to the second end is exposed to form an effective discharge length; The inner tube is movably arranged in the second channel of the ablation needle tube; at least one deformable claw is formed at one end of the inner tube away from the holding portion, and the claw can be received in the second channel of the ablation needle tube. When the claw passes through the second channel of the ablation needle tube, the claw spreads out to form an anchoring structure.

2. The ablation device with a fixable end portion according to claim 1, characterized in that: The claw portion has a tip at one end away from the inner tube.

3. The ablation device with a fixable end portion according to claim 2, characterized in that: When the claws are spread out, the tips of the claws point toward one side of the inner tube.

4. The ablation device with a fixable end portion according to claim 1, characterized in that: The holding part includes a first shell, a support rod and a second shell, the first shell is provided with a first branch channel, the support rod is provided with a second branch channel, the second shell is provided with a third branch channel, the first shell is movably set at one end of the support rod through the first branch channel, the second shell is movably set at the other end of the support rod through the third branch channel, the first branch channel, the second branch channel and the third branch channel constitute the first channel, the first end of the ablation needle tube is connected to one end of the support rod, the second channel is communicated with the second branch channel, and one end of the inner tube is connected to the second shell.

5. The ablation device with a fixable end portion according to claim 4, characterized in that: It also includes an outer sheath tube, which is movably arranged on the ablation needle tube, one end of which is connected to the first shell, and the ablation needle tube can be received in the outer sheath tube.

6. The ablation device with a fixable end portion according to claim 5, characterized in that: It also includes a puncture assembly, which includes a puncture needle having a needle head, the needle head is provided with a blade, and a needle cap is provided at one end of the puncture needle, wherein a third channel is provided in the inner tube, the needle head of the puncture needle passes through the third channel and passes through the end of the inner tube provided with the claw portion, and the other end of the puncture needle is detachably connected to the second shell through the needle cap.

7. The ablation device with a fixable end portion according to claim 5, characterized in that: It also includes a cable assembly that is detachably connected to the second shell, the cable assembly includes a needle core, a locking cap, and a cable electrically connected to the needle core, one end of the needle core can be inserted into the third channel of the inner tube and electrically connected to the ablation needle tube, the cable is connected to an external energy generator, and the cable assembly is detachably fixed to the second shell through the locking cap.

8. The ablation device with a fixable end portion according to claim 4, characterized in that: The first shell is provided with a first threaded hole, the first threaded hole is provided with a first locking screw, and one end of the first locking screw can abut against or be separated from the support rod.

9. The ablation device with a fixable end portion according to claim 4, characterized in that: The second shell is provided with a second threaded hole, the second threaded hole is provided with a second locking screw, and one end of the second locking screw can abut against or be separated from the support rod.

10. The ablation device with a fixable end portion according to claim 4, characterized in that: The support rod is provided with a first limiting portion, one end of the first shell can abut against the first limiting portion, and one end of the second shell can abut against the first limiting portion.

11. The ablation device with a fixable end portion according to claim 10, characterized in that: The support rod is provided with scale marks, and the scale marks are respectively located on both sides of the first limiting portion.

12. The ablation device with a fixable end portion according to claim 4, characterized in that: One end of the support rod is adapted to the first sub-channel shape of the first shell, and the other end of the support rod is adapted to the third sub-channel shape of the second shell, wherein a second limiting portion is provided between the support rod and the first shell and the second shell respectively.

13. The ablation device with a fixable end portion according to claim 12, characterized in that: The second limiting portion includes a second limiting groove distributed axially along the support rod and a second limiting boss respectively arranged on the first shell and the second shell, or a second limiting boss distributed axially on the support rod and a second limiting groove respectively arranged on the first shell and the second shell, and the second limiting boss is adapted to the second limiting groove.

14. The ablation device with a fixable end portion according to claim 2, characterized in that: The claw portion is made of memory alloy, and a second insulating layer is arranged on the claw portion.

15. The ablation device with a fixable end portion according to claim 5, characterized in that: The outer sheath tube, the inner tube and the ablation needle tube are all rigid structures.

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