A telescopic smoking tube ablation electrode knife

Abstract

The utility model relates to medical instrument technical field discloses a kind of telescopic smoking pipe ablation electrode knives, comprising: shell, driving assembly is arranged in the shell, smoking pipe is fixedly installed in the shell, motor cutter body is inserted in the smoking pipe, motor cutter body is coaxially fixedly connected with smoking pipe, the utility model can be adjusted telescopic pipe suction inlet and the distance of motor cutter body working end by telescopic pipe telescoping in smoking pipe, adapt to the needs of different surgical sites, while telescoping in telescopic pipe, let O type sealing ring restore elasticity, thereby far from smoking pipe inner wall, on the one hand reduce the resistance in telescopic pipe moving process, on the other hand avoid O type sealing ring and smoking pipe inner wall excessive friction, and when adjusting is completed, second annular plate extrudes O type sealing ring again, to realize sealing effect, so as to ensure that telescopic pipe in frequent telescoping adjustment, guarantee O type sealing ring provide enough sealing property.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an ablation electrode knife with a telescopic smoking tube. Background Technology

[0002] Ablation electrodes use high-frequency current to precisely treat biological tissues. They are widely used in general surgery, cardiology, gynecology, urology, neurosurgery and other fields, and are an important tool for surgeons. The unique feature of ablation electrodes with a fumigation tube is that the fumigation tube is integrated with the electrode body in a structural design. The fumigation tube is placed around the working end of the electrode. In this way, when the electrode operates on the tissue and produces smoke, the fumigation tube can remove the smoke in a timely and effective manner, thereby maintaining a clear surgical field.

[0003] However, in existing ablation electrode knives, the distance between the smoke extraction tube and the working end is constant. This means that in different surgical procedures, due to the differences in the surgical site, different lengths of smoke extraction tubes are required to ensure effective smoke absorption and a good surgical field of vision. However, the existing design cannot meet this requirement.

[0004] To address the aforementioned technical problems, the applicant has retrieved some existing technologies for adjusting the distance between the suction tube and the working end of the electrode knife. For example, patent publication number CN221106013U mainly uses a fixed insertion hole on the suction tube to allow a positioning rod to engage with different fixed insertion holes, thereby achieving the purpose of making the suction tube retractable. After analysis, the applicant found that the drawback of this technical solution is that, due to the retractable design of the suction tube and the presence of an electrode head inside the suction tube, the suction tube and the electrode head are slidably connected. This means that after adjusting the position of the suction tube, the sealing conditions at the connection between the suction tube and the electrode head change, leading to a decrease in sealing performance and subsequent air leakage. Based on this, the applicant has purposefully provided a telescopic suction tube ablation electrode knife that can ensure the sealing performance during position adjustment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an ablation electrode knife with a telescopic smoking tube, thereby solving the technical problems in the prior art.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An ablation electrode knife with a telescopic smoking tube, comprising:

[0008] The housing contains a drive assembly and a smoke tube. A motor blade body is inserted into the smoke tube and coaxially fixedly connected to the smoke tube. One end of the smoke tube is connected to a tail-end suction tube. A telescopic tube is slidably installed on the inner wall of the housing. A locking assembly is provided on the telescopic tube and connected to the drive assembly. The telescopic tube is sleeved on the motor blade body, and a smoke channel is formed between the two. The smoke channel is connected to the smoke tube. The telescopic tube is slidably inserted into the smoke tube and is driven to move by the drive assembly. A telescopic channel is formed between the outer surface of the telescopic tube and the inner wall of the smoke tube.

[0009] A first annular plate is fixedly installed at one end of the telescopic tube, and the outer surface of the first annular plate is in contact with the inner wall of the smoking tube. A second annular plate is slidably installed in the telescopic channel. An O-ring is provided between the first annular plate and the second annular plate. The second annular plate is driven to move by a locking assembly. When the second annular plate moves towards the first annular plate driven by the locking assembly, the second annular plate squeezes the O-ring, causing the O-ring to deform, thereby sealing the telescopic channel.

[0010] As a further embodiment of this utility model: the driving assembly includes a fixed ring, an extension block, and a threaded rod. A sliding groove is provided on the outer shell. A fixed frame is fixedly installed on the outer circular surface of the outer shell. The threaded rod is rotatably installed on the fixed frame and is driven to rotate by a driving source. The fixed ring is sleeved on the outer circular surface of the telescopic tube, and the two are coaxially and fixedly connected. The fixed ring is slidably installed on the inner wall of the outer shell. The extension block is slidably installed in the sliding groove and is fixedly connected to the fixed ring. The extension block is threadedly connected to the threaded rod.

[0011] As a further embodiment of this utility model: the locking assembly includes a long rod, a sleeve plate, a pressing plate, and a limiting assembly. The limiting assembly is disposed on the fixed ring. The sleeve plate is sleeved on the outer circular surface of the telescopic tube, and the two are slidably connected. The sleeve plate is also slidably connected to the inner wall of the outer shell and connected to the limiting assembly. The long rod is slidably installed on the fixed ring, and one end of the long rod passes through the smoking tube and is fixedly connected to the second annular plate. The other end of the long rod is fixedly connected to the sleeve plate. The pressing plate is slidably installed in the groove and is fixedly connected to the sleeve plate. The pressing plate is located on the outer side of the outer shell. The pressing plate is driven to move by a first output source. When the first output source drives the pressing plate to move the sleeve plate toward the fixed ring, the second annular plate moves synchronously toward the first annular plate.

[0012] As a further embodiment of this utility model: the limiting component includes a fixed rod, a square groove, a square block, a locking hole, a cavity, a locking block, and a plug rod. The square groove is formed on the fixed ring, the fixed rod is fixedly installed on the sleeve plate, the square block is fixedly installed on the fixed rod, the square block has a locking hole and is slidably installed in the square groove, the cavity is formed in the extension block, the locking block is slidably installed in the cavity, the locking block is slidably engaged with the locking hole, and the length of the locking block is greater than the length of the locking hole, the plug rod is slidably installed in the extension block, the plug rod is driven to move by a second output source, the plug rod is fixedly connected to the locking block, and one end of the plug rod is located outside the extension block. When the sleeve plate moves towards the fixed ring so that the locking hole and the cavity are aligned, the locking block slides into the locking hole.

[0013] As a further embodiment of this utility model: the limiting component further includes a first spring and a second spring, the sleeve plate is connected to the fixing ring through the first spring, and the preload of the first spring causes the sleeve plate to move away from the pressing plate, the locking block is connected to the cavity through the second spring, and the preload of the second spring causes the locking block to move toward the square groove.

[0014] As a further embodiment of this utility model: a scale is provided on the fixing frame, and one end of the extension block points to the scale.

[0015] The beneficial effects of this utility model are:

[0016] 1. In this utility model, the telescopic tube extends and retracts within the smoking tube to ensure that the distance between the inlet of the telescopic tube and the working end of the motor knife body can be adjusted to meet the needs of different surgical sites. When the telescopic tube extends and retracts, the O-ring seal regains its elasticity and moves away from the inner wall of the smoking tube. This reduces the resistance during the movement of the telescopic tube and avoids excessive friction between the O-ring seal and the inner wall of the smoking tube. After adjustment, the O-ring seal is squeezed by the second annular plate to achieve a sealing effect. This ensures that the O-ring seal provides sufficient sealing even during frequent extension and retraction of the telescopic tube.

[0017] 2. In this utility model, when the locking hole is aligned with the cavity, the insert rod is manually moved so that the locking block is inserted into the locking hole and the length of the locking block is greater than the length of the locking hole. This ensures that the locking block restricts the square block in the square groove, preventing the sleeve plate from moving away from the fixing ring. This ensures that the second annular plate is always pressing the O-ring seal, thus guaranteeing the sealing effect. Conversely, pulling the insert rod causes the locking block to move out of the locking hole. At this time, the first output source can drive the pressing plate to move the sleeve plate away from the fixing ring, and the telescopic tube can be adjusted for extension and retraction.

[0018] 3. In this utility model, by adding a first spring and a second spring, when the locking hole and the cavity are aligned, the second spring will directly push the locking block into the locking hole, thereby eliminating the need to manually push the insertion rod, shortening the locking time. When it is necessary to adjust the extension and retraction of the telescopic tube, the insertion rod is manually pulled to move the locking block out of the locking hole. At this time, the first spring will push the sleeve plate away from the fixing ring automatically, so that the extension and retraction of the telescopic tube can be directly adjusted, eliminating the need to manually move the sleeve plate and improving the comfort of operation. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the outer shell of this utility model;

[0022] Figure 3 This is a cross-sectional structural diagram of the smoking tube in this utility model;

[0023] Figure 4 This is a partial structural diagram of the smoking tube in this utility model;

[0024] Figure 5 This utility model Figure 4 Enlarged structural diagram of section A;

[0025] Figure 6 This utility model Figure 1 A cross-sectional structural diagram.

[0026] In the diagram: 1. Outer shell; 101. Slide groove; 102. Fixing frame; 2. Smoking pipe; 3. Motor blade body; 4. Telescopic tube; 5. Tail-end suction pipe; 6. First annular plate; 7. O-ring seal; 8. Second annular plate; 9. Long rod; 10. Fixing ring; 11. Extension block; 12. Threaded rod; 13. Sleeve plate; 14. Pressing plate; 15. Fixing rod; 16. First spring; 17. Square groove; 18. Square block; 19. Locking hole; 20. Cavity; 21. Locking block; 22. Second spring; 23. Insert rod; 24. Scale. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-6 As shown, this utility model is an ablation electrode knife with a telescopic smoking tube, comprising:

[0029] The housing 1 contains a drive assembly and a smoking tube 2. A motor blade body 3 is inserted into the smoking tube 2 and is coaxially and fixedly connected to the smoking tube 2. One end of the smoking tube 2 is connected to a tail-end suction tube 5. A telescopic tube 4 is slidably installed on the inner wall of the housing 1. A locking assembly is provided on the telescopic tube 4 and is connected to the drive assembly. The telescopic tube 4 is sleeved on the motor blade body 3, and a smoking channel is formed between the two. The smoking channel is connected to the smoking tube 2. The telescopic tube 4 is slidably inserted into the smoking tube 2. The telescopic tube 4 is driven to move by the drive assembly, and a telescopic channel is formed between the outer surface of the telescopic tube 4 and the inner wall of the smoking tube 2.

[0030] A first annular plate 6 is fixedly installed at one end of the telescopic tube 4, and the outer surface of the first annular plate 6 is in contact with the inner wall of the smoking tube 2. A second annular plate 8 is slidably installed in the telescopic channel. An O-ring seal 7 is provided between the first annular plate 6 and the second annular plate 8. The second annular plate 8 is driven to move by a locking component. When the second annular plate 8 moves towards the first annular plate 6 driven by the locking component, the second annular plate 8 squeezes the O-ring seal 7, causing the O-ring seal 7 to deform, thereby sealing the telescopic channel.

[0031] The working principle of this utility model is as follows: Figure 1 As shown in the example, the tip of the motor scalpel body 3 is the working end. During surgery, when the motor scalpel body 3 operates on human tissue, it generates smoke. At this time, the suction force generated by the tail-end suction tube 5 will cause the telescopic tube 4 to draw the smoke into the smoke extraction channel. Subsequently, the smoke enters the tail-end suction tube 5 through the smoke extraction tube 2, thereby achieving the purpose of smoke removal. When surgery is required on different parts of the human body, the distance between the telescopic tube 4 and the working end of the motor scalpel body 3 is adjusted according to the surgical site. The specific operation is as follows: First, the second annular plate 8 is driven away from the first annular plate 6 by the locking component. At this time, as shown in the example, the second annular plate 8 is driven away from the first annular plate 6. Figure 3As shown in the example, the O-ring 7 will regain its elasticity and will not be squeezed against the inner wall of the suction tube 2. Subsequently, the drive assembly drives the telescopic tube 4 to move, thereby adjusting the distance between the suction port of the telescopic tube 4 and the working end of the motor blade body 3. At the same time, the first annular plate 6 and the second annular plate 8 will slide on the inner wall of the suction tube 2, and the O-ring 7 moves synchronously with the first annular plate 6 and the second annular plate 8. After the adjustment is completed, the locking assembly drives the second annular plate 8 to approach the first annular plate 6. The second annular plate 8 squeezes the O-ring 7, causing the O-ring 7 to deform and allow the O-ring to... The O-ring 7 abuts against the inner wall of the smoking tube 2 and the first annular plate 6, thereby sealing the telescopic channel. With this configuration, when the telescopic tube 4 extends or retracts, the O-ring 7 regains its elasticity and moves away from the inner wall of the smoking tube 2. This reduces the resistance during the movement of the telescopic tube 4 and avoids excessive friction between the O-ring 7 and the inner wall of the smoking tube 2. After adjustment, the O-ring 7 is squeezed by the second annular plate 8 to achieve a sealing effect. This ensures that the O-ring 7 provides sufficient sealing during frequent extension and retraction of the telescopic tube 4.

[0032] like Figures 1-3 As shown in the preferred embodiment of this utility model, the driving assembly includes a fixed ring 10, an extension block 11, and a threaded rod 12. A sliding groove 101 is provided on the outer shell 1. A fixing frame 102 is fixedly installed on the outer circular surface of the outer shell 1. The threaded rod 12 is rotatably installed on the fixing frame 102 and is driven to rotate by a driving source. The fixed ring 10 is sleeved on the outer circular surface of the telescopic tube 4, and the two are coaxially fixedly connected. The fixed ring 10 is slidably installed on the inner wall of the outer shell 1. The extension block 11 is slidably installed in the sliding groove 101 and is fixedly connected to the fixed ring 10. The extension block 11 is threadedly connected to the threaded rod 12.

[0033] In one embodiment, the driving source can be a servo motor, a servo motor or other components, or it can be manually driven. Other mechanisms that can achieve rotational motion can also be used. This embodiment does not impose specific limitations on these components.

[0034] In practical application, the drive source drives the threaded rod 12 to rotate, and the threaded rod 12 is threadedly connected to the extension block 11. Therefore, the threaded rod 12 will drive the extension block 11 to move within the slide groove 101, and the extension block 11 will drive the fixing ring 10 to move. In turn, the fixing ring 10 will drive the telescopic tube 4 to move, thereby adjusting the distance between the telescopic tube 4 and the working end of the motor knife body 3 to meet the needs of different surgical sites. The threaded rod 12 drives the extension block 11 to move. When the telescopic tube 4 is adjusted to a suitable position, the rotation of the threaded rod 12 is stopped. Due to the meshing effect between the threads, the position of the extension block 11 can be kept constant, ensuring that the position of the telescopic tube 4 remains unchanged during the operation.

[0035] like Figures 1-6 As shown in the preferred embodiment of this utility model, the locking assembly includes a long rod 9, a sleeve plate 13, a pressing plate 14, and a limiting assembly. The limiting assembly is disposed on the fixing ring 10. The sleeve plate 13 is sleeved on the outer circular surface of the telescopic tube 4, and the two are slidably connected. The sleeve plate 13 is also slidably connected to the inner wall of the outer shell 1 and connected to the limiting assembly. The long rod 9 is slidably installed on the fixing ring 10, and one end of the long rod 9 passes through the smoking tube 2 and is fixedly connected to the second annular plate 8. The other end of the long rod 9 is fixedly connected to the sleeve plate 13. The pressing plate 14 is slidably installed in the sliding groove 101 and is fixedly connected to the sleeve plate 13. The pressing plate 14 is located on the outside of the outer shell 1. The pressing plate 14 is driven to move by a first output source. When the first output source drives the pressing plate 14 to move the sleeve plate 13 toward the fixing ring 10, the second annular plate 8 moves synchronously toward the first annular plate 6.

[0036] In one embodiment, the first output source can be manually operated or other mechanisms capable of achieving linear motion of the pressing plate 14. This embodiment does not impose specific limitations on these mechanisms.

[0037] In practical application, the movable sleeve 13 can drive the second annular plate 8 to move synchronously via the long rod 9, thereby achieving the purpose of the second annular plate 8 moving closer to and further away from the first annular plate 6. The sleeve 13 is controlled by the movement of the pressing plate 14, which is located outside the outer shell 1, making it convenient for manual operation and achieving the effect of quickly adjusting the telescopic tube 4.

[0038] like Figures 1-6 As shown, in a preferred embodiment of this utility model, the limiting component includes a fixing rod 15, a square groove 17, a square block 18, a locking hole 19, a cavity 20, a locking block 21, and a plug rod 23. The square groove 17 is formed on the fixing ring 10. The fixing rod 15 is fixedly installed on the sleeve plate 13. The square block 18 is fixedly installed on the fixing rod 15. The square block 18 has a locking hole 19 and is slidably installed in the square groove 17. The cavity 20 is formed in the extension block 1. Inside the cavity 20, a locking block 21 is slidably installed. The locking block 21 is slidably engaged with the locking hole 19, and the length of the locking block 21 is greater than the length of the locking hole 19. The insertion rod 23 is slidably installed inside the extension block 11. The insertion rod 23 is driven to move by the second output source. The insertion rod 23 is fixedly connected to the locking block 21, and one end of the insertion rod 23 is located outside the extension block 11. When the sleeve plate 13 moves toward the fixing ring 10 so that the locking hole 19 is aligned with the cavity 20, the locking block 21 slides into the locking hole 19.

[0039] In one embodiment, the first output source can be manually operated or other mechanisms capable of realizing the reciprocating linear motion of the insertion rod 23. This embodiment does not impose specific limitations on these mechanisms.

[0040] In practical applications, this embodiment, such as Figure 5 As shown in the example, the first output source drives the pressing plate 14 to bring the sleeve 13 closer to the fixing ring 10, which in turn brings the second annular plate 8 closer to the first annular plate 6, thereby deforming the O-ring 7 to achieve a sealing effect. At this time, it is necessary to ensure that the position of the second annular plate 8 does not move, that is, to restrict the position of the sleeve 13. When the sleeve 13 is close to the fixing ring 10, the fixing rod 15 will drive the square block 18 to insert into the square groove 17. At this time, the locking hole 19 is aligned with the cavity 20, and the insertion rod 23 is manually moved to make the locking hole 19 aligned with the cavity 20. The locking block 21 is inserted into the locking hole 19, and the length of the locking block 21 is greater than the length of the locking hole 19. This ensures that the locking block 21 restricts the square block 18 within the square groove 17, preventing the sleeve plate 13 from moving away from the fixing ring 10. This ensures that the second annular plate 8 is always pressing against the O-ring 7, guaranteeing the sealing effect. Conversely, pulling the insertion rod 23 causes the locking block 21 to move out of the locking hole 19. At this time, the first output source can drive the pressing plate 14 to move the sleeve plate 13 away from the fixing ring 10, allowing the telescopic tube 4 to be extended and retracted.

[0041] like Figures 1-6 As shown, in a preferred embodiment of the present invention, the limiting component further includes a first spring 16 and a second spring 22. The sleeve 13 is connected to the fixing ring 10 through the first spring 16, and the preload of the first spring 16 causes the sleeve 13 to move away from the pressing plate 14. The locking block 21 is connected to the cavity 20 through the second spring 22, and the preload of the second spring 22 causes the locking block 21 to move toward the square groove 17.

[0042] In practical application, this embodiment incorporates a first spring 16 and a second spring 22. When the locking hole 19 and the cavity 20 are aligned, the second spring 22 directly pushes the locking block 21 into the locking hole 19, thus eliminating the need to manually push the insertion rod 23, shortening the locking time. When it is necessary to adjust the extension and retraction of the telescopic tube 4, the insertion rod 23 is manually pulled to move the locking block 21 out of the locking hole 19. At this time, the first spring 16 pushes the sleeve plate 13 away from the fixing ring 10, thereby allowing direct adjustment of the extension and retraction of the telescopic tube 4, eliminating the need to manually move the sleeve plate 13, and improving the comfort of operation.

[0043] like Figures 1-6 As shown, in a preferred embodiment of the present invention, the fixing frame 102 is provided with a scale 24, and one end of the extension block 11 points to the scale 24.

[0044] In practical application, when the extension block 11 moves, that is, when the extension block 11 drives the telescopic tube 4 to extend and retract, the movement of the extension block 11 can be observed through the scale 24. In this way, the distance moved by the telescopic tube 4 can be accurately observed, thereby better grasping the distance between the suction port of the telescopic tube 4 and the working end of the motor knife body 3, and improving the accuracy of adjustment.

[0045] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An ablation electrode knife with a telescopic smoking tube, characterized in that, include: The outer shell (1) is provided with a drive assembly, and a smoking tube (2) is fixedly installed inside the outer shell (1). A motor knife body (3) is inserted into the smoking tube (2). The motor knife body (3) is coaxially fixedly connected to the smoking tube (2). One end of the smoking tube (2) is connected to the tail end suction tube (5). A telescopic tube (4) is slidably installed on the inner wall of the outer shell (1). A locking assembly is provided on the telescopic tube (4). The locking assembly is connected to the drive assembly. The telescopic tube (4) is sleeved on the motor knife body (3), and a smoking channel is formed between the two. The smoking channel is connected to the smoking tube (2). The telescopic tube (4) is slidably inserted into the smoking tube (2). The telescopic tube (4) is driven by the drive assembly to move, and a telescopic channel is formed between the outer surface of the telescopic tube (4) and the inner wall of the smoking tube (2). The first annular plate (6) is fixedly installed at one end of the telescopic tube (4), and the outer surface of the first annular plate (6) is in contact with the inner wall of the smoking tube (2). The second annular plate (8) is slidably installed in the telescopic channel. An O-ring (7) is provided between the first annular plate (6) and the second annular plate (8). The second annular plate (8) is driven to move by the locking assembly. When the second annular plate (8) is driven to move towards the first annular plate (6) by the locking assembly, the second annular plate (8) squeezes the O-ring (7) to deform the O-ring (7), thereby sealing the telescopic channel.

2. The ablation electrode knife with a telescopic smoking tube according to claim 1, characterized in that, The drive assembly includes a fixed ring (10), an extension block (11), and a threaded rod (12). A groove (101) is provided on the outer shell (1). A fixed frame (102) is fixedly installed on the outer circular surface of the outer shell (1). The threaded rod (12) is rotatably installed on the fixed frame (102) and is driven to rotate by a drive source. The fixed ring (10) is sleeved on the outer circular surface of the telescopic tube (4) and the two are coaxially fixedly connected. The fixed ring (10) is slidably installed on the inner wall of the outer shell (1). The extension block (11) is slidably installed in the groove (101) and is fixedly connected to the fixed ring (10). The extension block (11) is threadedly connected to the threaded rod (12).

3. The ablation electrode knife with a telescopic smoking tube according to claim 2, characterized in that, The locking assembly includes a long rod (9), a sleeve plate (13), a pressing plate (14), and a limiting assembly. The limiting assembly is mounted on a fixing ring (10). The sleeve plate (13) is fitted onto the outer surface of the telescopic tube (4), and the two are slidably connected. The sleeve plate (13) is also slidably connected to the inner wall of the outer shell (1). The sleeve plate (13) is connected to the limiting assembly. The long rod (9) is slidably mounted on the fixing ring (10), and one end of the long rod (9) passes through the smoking tube (2) and is fixed to the second annular plate (8). The long rod (9) is fixedly connected to the sleeve plate (13) at the other end. The pressing plate (14) is slidably installed in the slide groove (101) and the pressing plate (14) is fixedly connected to the sleeve plate (13). The pressing plate (14) is located outside the outer shell (1). The pressing plate (14) is driven to move by the first output source. When the first output source drives the pressing plate (14) to move the sleeve plate (13) toward the fixed ring (10), the second ring plate (8) moves toward the first ring plate (6) simultaneously.

4. The ablation electrode knife with a telescopic smoking tube according to claim 3, characterized in that, The limiting assembly includes a fixed rod (15), a square groove (17), a square block (18), a locking hole (19), a cavity (20), a locking block (21), and a plug rod (23). The square groove (17) is formed on the fixed ring (10). The fixed rod (15) is fixedly installed on the sleeve plate (13). The square block (18) is fixedly installed on the fixed rod (15). The square block (18) has a locking hole (19) and is slidably installed in the square groove (17). The cavity (20) is formed in the extension block (11). 0) A locking block (21) is slidably installed inside the locking hole (19). The locking block (21) is slidably engaged with the locking hole (19), and the length of the locking block (21) is greater than the length of the locking hole (19). The insertion rod (23) is slidably installed inside the extension block (11). The insertion rod (23) is driven to move by the second output source. The insertion rod (23) is fixedly connected to the locking block (21), and one end of the insertion rod (23) is located outside the extension block (11). When the sleeve plate (13) moves towards the fixing ring (10) so that the locking hole (19) is aligned with the cavity (20), the locking block (21) slides into the locking hole (19).

5. The ablation electrode knife with a telescopic smoking tube according to claim 4, characterized in that, The limiting assembly also includes a first spring (16) and a second spring (22). The sleeve (13) is connected to the fixing ring (10) through the first spring (16), and the preload of the first spring (16) causes the sleeve (13) to move away from the pressing plate (14). The locking block (21) is connected to the cavity (20) through the second spring (22), and the preload of the second spring (22) causes the locking block (21) to move toward the square groove (17).

6. The ablation electrode knife with a telescopic smoking tube according to claim 2, characterized in that, The fixed frame (102) is provided with a scale (24), and one end of the extension block (11) points to the scale (24).

Images