CN217488828U - Electrotome catheter and electrotome catheter assembly - Google Patents

Abstract

The application discloses electrotome pipe and electrotome catheter subassembly, electrotome pipe includes: a first tube having opposite distal and proximal ends; the identification ring is fixed on the periphery of the first pipe body; the electrode comprises an electrode, a first tube body and a second tube body, wherein the proximal end of the electrode is of a tubular structure, the side wall of the tubular structure is provided with a fusion hole, a part with the fusion hole in the electrode is inserted into the distal end of the first tube body and is fixed by hot melting, and the distal end of the electrode is of a solid structure or a hollow structure integrally extending with the tubular structure; the handle is fixed at the near end of the first pipe body, and a circuit connector connected with the electrode and a pipeline connector communicated with the inside of the first pipe body are arranged on the handle. The distal end of the electrotome catheter provided by the application can adopt a solid structure or a hollow structure, and can be respectively suitable for electrocoagulation or electrotomy; the marking ring is used for providing reference for the cutting depth of the electrode during operation, so that the cutting depth is controllable; the electrode and the first conduit are fixed by heat fusion through the fusion hole to form mechanical interlock.

Description

Electrotome catheter and electrotome catheter assembly

Technical Field

The present application relates to the field of medical devices, and more particularly, to an electrotome catheter and an electrotome catheter assembly.

Background

Cancer is a killer threatening the health of the whole human being, and in all cases of cancer deaths, lung cancer is among the top of various malignancies. The relevant research results show that the 5-year survival rate of lung cancer patients is lower than 15%. Central lung cancer is a common type of lung cancer, a malignant tumor that originates in the epithelium of the bronchial mucosa. Unlike common lung cancer, the growth of central lung cancer cells is often accompanied by obstruction of the bronchial lumen, even atelectasis. At present, the treatment of patients with central lung cancer mostly adopts surgical treatment, such as local excision, enlarged excision, thoracotomy and auxiliary thoracoscopic surgery. However, this therapy is difficult to operate and risky, and is not suitable for patients with weak constitution and poor cardiopulmonary or blood coagulation function. And the operative treatment can cause irreversible damage to the lung function of the patient, increase the pain of the patient and be not beneficial to postoperative recovery. In recent years, attention is paid to various bronchoscopic interventional therapies, and a high-frequency electrotome under a bronchofiberscope can electrically cut tumors, relieve airway obstruction and improve respiratory symptoms.

The common high-frequency electrotome products on the market at present have two kinds: one is an electrotome pen applied to surgical operation, which has two modes of monopolar electrotomy electrocoagulation and bipolar electrocoagulation, and can replace the traditional scalpel to cut and coagulate lesion tissues; although the electrotome pen has the advantages of high cutting efficiency, good hemostatic effect and the like compared with the traditional scalpel, the electrotome pen can cause thermal injury in a larger range, and can increase the pain of a patient, prolong the healing period after operation and be not beneficial to postoperative recovery because of the need of open operation. The other is a high-frequency electrotome catheter suitable for endoscopic surgery, which can cut and coagulate blood of tumor tissue under a mirror. Due to the application to interventional surgery, higher requirements are put on the reliability of the high-frequency electrotome catheter, the electrode connection strength, the position detection during the surgery and the like.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an electrotome catheter in view of the above technical problems.

The utility model provides an electrotome catheter, includes:

a first tube having opposite distal and proximal ends;

the identification ring is fixed on the periphery of the first pipe body;

the proximal end of the electrode is of a cylindrical structure, a fusion hole is formed in the side wall of the cylindrical structure, a part with the fusion hole in the electrode is inserted into the distal end of the first tube body and is fixed in a hot melting mode, and the distal end of the electrode is of a solid structure or a hollow structure extending integrally with the cylindrical structure;

the handle is fixed at the near end of the first pipe body, and a circuit connector connected with the electrode and a pipeline connector communicated with the inside of the first pipe body are arranged on the handle.

The distal end of the electric knife conduit can adopt a solid structure or a hollow structure, and can be respectively suitable for electric coagulation or electric cutting; the marking ring is used for providing reference for the depth of the electrode cutting into the tissue during operation, so that the cutting depth is controllable; the electrode and the first conduit are fixed by hot melting through the fusion hole to form mechanical interlock and maintain the stability of the electrode and the first conduit.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

The fusion holes are arranged along the circumferential direction of the electrode.

The number of the fusion holes is increased, so that the uniform distribution of the connection strength is facilitated, and the serious reduction of the local strength of the electrode can be avoided.

The first pipe body comprises three sections which are sequentially arranged from a near end to a far end, wherein the sections which are close to the far end and the near end are hard sections, the soft sections are arranged in the middle, each section is made of Pebax materials and is lined with a stainless steel woven net, and the rigidity of each hard section is larger than that of each soft section.

The Pebax material is utilized to wrap the stainless steel mesh grid, so that the strength of the pipe body and the bending requirement during insertion can be both considered.

Optionally, a sheath wrapped outside the first tube is fixed at the distal end of the handle.

The sheath can improve joint strength, avoids the handle with first body connects the position unnecessary to be discounted, and the sheath can adopt the smoother material in surface in addition, is convenient for intervene the operation.

Optionally, the distance between the identification ring and the farthest end of the electrode is 5 mm-25 mm.

The position of the identification ring is related to the expected cutting depth and is used for assisting in judging the cutting depth, taking the working channel of the bronchoscope as an example, when the identification ring is exposed out of the distal end of the bronchoscope during operation, the identification ring is pushed again, and therefore potential safety hazards of misoperation are reduced.

Optionally, the identification ring is a stainless steel ring.

The connection strength with first body and the convenience of processing can be guaranteed to suitable material.

Optionally, the electrode is of a hollow structure and is in butt joint communication with the first tube body, an auxiliary mandrel in movable fit is arranged inside the first tube body, a distal end of the auxiliary mandrel is of a spherical crown shape and is configured to extend out of a distal end of the electrode, and a pipeline joint on the handle is used for the auxiliary mandrel to penetrate.

The auxiliary mandrel is combined with the electrode with the hollow structure, so that residues in the electrode can be pushed out conveniently during or after the operation. The spherical crown-shaped distal end facilitates smooth guiding of the pushing of the auxiliary mandrel. When the electrotome catheter is conveyed to a preset position, the auxiliary mandrel can be inserted into the first tube body in advance, and the spherical crown-shaped distal end is exposed to implement safe guidance.

Optionally, the distal end of the electrode is of a solid structure, and a suction hole communicated with the inside of the first tube is formed in the position, adjacent to the electrode, of the side wall of the first tube.

The first pipe body and the suction hole integrally form a smoke exhaust channel, the outside can be connected with vacuum equipment, and smoke or blood water and the like can be timely exhausted in the operation process.

Optionally, the suction hole corresponds to the fusion hole.

The two positions correspond to each other, so that structural interference is avoided, the size of the proximal end of the electrode is allowed to be slightly longer, and the structure and the assembly strength of the electrode are guaranteed.

Optionally, the distal tip of the electrode is shaped.

The present application further provides an electrotome catheter assembly comprising a locking device and an electrotome catheter of the present application, the locking device comprising:

the buckle is used for being combined with the inlet part of the working channel of the bronchoscope;

the locking head is in threaded fit with the buckle;

the straight-through valve is detachably connected with the locking head;

the buckle, the locking head and the straight-through valve are mutually butted and are provided with threading channels for the electric knife conduit to extend.

Optionally, the end of the interface member has an annular flange structure, and the snap and the locking head clamp and fix the flange structure.

Optionally, the straight-through valve includes a movable portion and a fixed portion that are in threaded fit, wherein the fixed portion is in butt joint with the locking head, an elastic member is clamped between the movable portion and the fixed portion, and the elastic member tightens the electrotome catheter in the threading channel after being pressed.

The utility model provides an electrotome pipe further improves electrode joint strength through institutional advancement, the operation position of the perception operation in-process of being more convenient for.

Drawings

FIG. 1 is a perspective view of an electrotome catheter according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure of FIG. 1;

FIG. 3a is an enlarged view of portion A of FIG. 2;

FIG. 3b is a schematic structural diagram of the electrode of FIG. 2;

FIG. 3c is a partial cross-sectional view of FIG. 3 a;

FIG. 4a is a schematic diagram of an electrode structure according to an embodiment of the present application;

FIG. 4b is a schematic diagram of the electrode structure of FIG. 4 a;

FIG. 5 is a schematic view of an embodiment of the present application;

FIG. 6 is a partial schematic view of a first tube according to an embodiment of the present application;

FIG. 7 is a schematic view of a portion of a bronchoscope according to an embodiment of the present disclosure;

FIGS. 8-11 are schematic views of a locking device according to an embodiment of the present application;

the reference numerals in the figures are illustrated as follows:

10. an electrotome catheter; 11. an auxiliary mandrel; 12. an electrode; 121. a fusion hole; 13. a first pipe body; 131. necking; 14. an identification ring; 15. a heat shrink tube; 16. a handle; 17. a circuit connector; 18. a pipe joint; 19. a mandrel luer head;

20. an electrotome catheter; 22. an electrode; 221. a fusion hole; 23. a first pipe body; 231. necking; 232. a suction hole; 24. an identification ring; 25. heat shrink tubing; 26. a handle; 27. a circuit connector; 28. and (4) connecting a pipeline.

40. An insertion tube; 41. an interface member; 42. a flange structure;

50. a locking device; 51. buckling; 510. a notch; 52. a locking head; 53. a straight-through valve; 531. a movable portion; 532. a fixing portion.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

In the embodiments of the present application, the proximal end refers to the end relatively close to or toward the operator during the intervention, and the distal end refers to the end relatively far away from or away from the operator. The first pipe body is in a shape of a slender cylinder and can be bent as a whole, and only a straightening state is shown in the figure. In the straightened state, the first pipe body integrally has an axis X-X'. The various components that make up the electrotome catheter are incorporated by reference.

Referring to fig. 1, 2, and 3 a-3 b, in one embodiment of the present application, an electrotome catheter 10 is provided, the electrotome catheter 10 comprising a first tubular body 13. The distal end of the first tube 13 is provided with an electrode 12, the proximal end of the electrode 12 is a cylindrical structure, and the distal end of the electrode 12 is a hollow structure extending integrally with the proximal cylindrical structure.

The present embodiment defines the electrode 12 as a hollow electrode, the electrode 12 having a spatial axial direction (axis X-X') in which one end of the electrode 12 is in abutting communication with the distal end of the first tube 13 and the other end of the electrode 12 is at the most distal end of the electrotome catheter 10 and is in an open arrangement. The first tubular body 13 serves as the main body of the electrotome catheter 10 with a hollow mandrel channel.

The electrotome catheter 10 is focused on electrotomy, and the electrode 12 of the electrotome catheter 10 is annular, and may be made of, for example, stainless steel, and is used to intervene in a patient and to excise a target tissue. The side wall of the hollow electrode is thin, and the end face of the far end of the hollow electrode is provided with a chamfer, so that the wall of an endoscope is prevented from being scratched when the electrode enters the endoscope.

The outer periphery of the first tube 13 is provided with a marker ring 14, the marker ring is a stainless steel ring, the distance L1 between the marker ring 14 and the most distal end of the electrode 12 is 5 mm-25 mm, for example, 10mm, and the preset distance L1 is used for providing reference for the depth of the electrode 12 cutting into the tissue during the operation, so that the cutting depth can be controlled. The first tube 13 has a distal end constriction 131 and is in abutting communication with the electrode 12 after being constricted.

The side wall of the electrode 12 is provided with a fusion hole 121, and the part of the electrode 12 with the fusion hole 121 is inserted into the distal end of the first tube 13 and is fixed by hot melting. The fusion holes 121 are plural and arranged along the circumferential direction of the electrode. Referring to fig. 3a and 3b, the fusion holes 121 are symmetrical rectangular grooves (in the side-wall expanded state). The electrode 12 is assembled to the state as in fig. 3 b; during hot melting, a core rod is inserted into the first tube body 13, and the melted material flow is filled into a fusion hole 121 between the core rod and the electrode 12; after solidification, the electrodes 12 are embedded in the first tubular body 13, achieving mechanical interlocking.

The first tube 13 is internally provided with a movably fitted auxiliary mandrel 11, the auxiliary mandrel 11 may be, for example, a solid rod, and the distal end of the auxiliary mandrel 11 is of a spherical crown shape and is configured to extend beyond the distal end of the electrode 12 and to be drawn away from the proximal end of the first tube 13 from the first tube 13.

For ease of operation, the electrosurgical catheter further includes a handle 16 secured to the proximal side of the first tube 13, and the first tube 13 may be secured to the distal side of the handle 16 by a sheath (heat shrink tubing 15). The sheath (heat shrinkable tube 15) is sleeved on the outer periphery of the first tube 13 and partially located inside the handle 16, and the heat shrinkable tube 15 is used for enhancing the strength of the joint part of the proximal end of the handle 16 and the first tube 13 and preventing the joint part from being bent during use. The heat shrinkable tube 15 is colored differently from the first tube body 13, for example, the heat shrinkable tube 15 is colored blue.

The handle 16 is provided with a circuit connector 17 connected to the electrode 12, a lead (not shown) between the electrode 12 and the circuit connector 17 can be led through the first tube 13 or the wall of the first tube 13, the circuit connector 17 is used for transmitting the energy of the high-frequency electric knife device to the electrode 12 through the lead, and the circuit connector 17 can be a banana connector, for example.

The handle 16 is further provided with a pipeline joint 18 communicated with the inside of the first pipe body 13, and the pipeline joint 18 can be used for the auxiliary core shaft 11 to penetrate or butt against an external pipeline. The first tube 13 extends distally from the proximal end of the handle 16, and the line connector 18 is disposed at the proximal end of the first tube 13. The line connector 18 is a luer connector which is matched with the core shaft luer head 19 to fix the auxiliary core shaft 11 in the catheter.

When in use, the high-frequency electric knife is correctly connected with a power supply, a negative plate and a control switch according to the use requirement of high-frequency electric knife equipment; taking out the conduit, and connecting the conduit with high-frequency electrotome equipment through a patch cord; the first tube 13 is inserted into the endoscope channel by holding the handle 16 until the electrode 12 is completely exposed from the endoscope; the mandrel luer 19 is unscrewed and detached from the luer, and the auxiliary mandrel 11 is removed from the catheter and set aside.

The angle of the endoscope tip is adjusted to bring the electrode 12 to the target tissue, and the control handle 16 adjusts the length of the first tube 13 to bring the marker ring 14 into view within the endoscope. Adjusting parameters of the high-frequency electrotome device, after determining a good position, opening a switch (for example, stepping on a foot switch), rapidly transmitting output energy of the high-frequency electrotome device to the electrode 12 by using a lead embedded in the conduit, wherein the energy distribution of the section of the electrode 12 is relatively uniform, tissue cells contacted with the electrode 12 are rapidly heated, the internal temperature of the cell tissue is increased, and water is evaporated, so that the cells are expanded and vaporized, the tissue is separated, and a hole is cut at a target part. The depth of the cut into the electrode 12 can be determined by reference to the distance between the marker ring 14 and the electrode 12. The tissue remaining in the first tube 13 after cutting can be advanced from the luer tip by means of the auxiliary mandrel 11 and ejected.

Referring to fig. 4a, 4b and 5, in one embodiment, another electrotome catheter 20 is provided, comprising a first tubular body 23, the distal end of the first tubular body 23 being provided with an electrode 22. The electrode 22 may be made of stainless steel for cutting and coagulating target tissue, and the proximal end of the electrode 22 may be a cylindrical structure and the distal end may be a solid structure, such as a cylindrical solid structure. The cylindrical structure and the solid structure of the electrode 22 may be welded together, for example.

The electrode 22 has a spatial axial direction (axis X-X') in which the proximal end of the electrode 22 is fixed to the distal end of the first tubular body 23 and the distal tip of the electrode 22 is shaped. For an electrode of solid construction, the shape of the distal end of the electrode 22 gradually converges. The solid structural portion of the electrode 22 may, in its own spatial configuration, divide a cylinder and a cone fixed to each other (i.e., so-called gradual convergence in shape), both having the same base diameter. The distal end of the electrode 22 is the apex of the cone, which smoothly transitions into a spherical head.

The side wall of the first tube 23 is formed with a suction hole 232 communicating with the inside of the first tube 23 at a position adjacent to the proximal end of the electrode 22. The ratio of the area of the pumping hole 232 (or the total area if there are a plurality of pumping holes) to the cross-sectional area of the electrode 22 is 0.7-1.2. The inner cavity of the first tube 23 serves as a smoke evacuation passage through which the suction holes 232 are used to remove smoke, blood, etc. generated during surgery.

The first tube 23 has an identification ring 24 around its outer circumference, the identification ring 24 being located on the proximal side of the suction hole 232. The first body 23 has a distal constriction 231 and the electrode 22 extends into the constriction 231.

In this embodiment, the tubular structure at the proximal end of the electrode 22 is provided with a fusion hole 221. The fusion hole 221 corresponds to and communicates with the suction hole 232. The electrode 22 is fixed to the distal end of the first tube 23 in a manner similar to that described above with reference to fig. 4a and 4 b.

In this embodiment, the electric knife catheter 20 further comprises a heat-shrinkable tube 25, a handle 26, a circuit connector 27 and a pipeline connector 28, and for the explanation of the operation and connection of the identification ring 24 and the above components (heat-shrinkable tube 25 to pipeline connector 28), reference is made to the embodiment related to fig. 1. In addition to the embodiment shown in fig. 1, in this embodiment, the line connector 28 is located at the proximal end of the handle 26, and the line connector 28 is a luer connector for connecting with a suction device, which can be used for smoking, aspirating and sputum aspirating.

The steps of using the electrotome catheter 20 include pre-use and intraoperative procedures, and reference is made specifically to the description of the embodiment associated with fig. 1. The electrode 22 of the electrotome catheter 20 is more heavily focused on electrocoagulation than the electrode 12 of the electrotome catheter 10 (annular cylinder). During electrostomy, the energy transmitted by the electrode 22 is gradually increased along the conical slope of the solid structure of the electrode 22, the energy reaches the maximum when reaching the far end of the electrode, and the tissue cells contacted with the far end of the electrode 22 are rapidly heated and vaporized and separated from the target tissue; during electrocoagulation, the energy of the electrode 22 is increased along the inclined plane of the electrode, the tissue cells contacted with the electrode are in a slow heating state, water in the cells is slowly evaporated, and proteins are gradually denatured, so that the tissue is coagulated, and eschar is formed on the surface of the tissue.

The embodiment utilizes the suction device connected with the luer head to discharge smoke, blood and the like generated in the operation out of the body through the suction hole 232 so as to ensure that the endoscope in the operation has clear visual field, thereby reducing the operation difficulty and the operation risk.

Referring to fig. 6, the first tube body includes three sections, i.e., a proximal section c1, a middle section c2 and a distal section c3, arranged in sequence from the proximal end to the distal end, each section is made of Pebax material and can be lined with a stainless steel mesh grid according to the strength requirement, and each section is made of hard material, soft material and hard material in sequence from the proximal end to the distal end. The flexibility of body distal end can be strengthened in the syllogic setting of first body, and the body distal end of being convenient for gets into the endoscope, can prevent that electrode end pipe from taking place to bend simultaneously.

The stainless steel knitted net can change knitting density according to different parts, such as average knitting density at a far end part and lower than that at a near end part, and the change limit of the knitting density is not strictly consistent with the sectional limit of the three sections.

In the above embodiments of the electrotome catheter, the electrotome catheter can be used in endoscopic surgery, can cut and coagulate blood of central tumor tissue under a bronchoscope, and has the advantages of simple operation, small wound and effective reduction of pain of patients. The electrotome catheter has a plurality of dimensions and specifications and is suitable for endoscopes with different specifications. Wherein, the electrode 12 with the hollow structure at the far end and the electrode 22 with the solid structure at the far end enable the electrotome catheter to adapt to electrotomy and electrocoagulation scenes according to different operation purposes, thereby improving the efficiency. The design of the smoke exhaust channel (the suction hole 232) can remove mucus, smoke, blood and the like in the operation target area, keep the visual field clear and optimize the operation effect.

The electrotome catheter performs electrotomy and electrocoagulation on target tissues under an endoscope by utilizing the concentrated thermal effect of high-frequency current on local biological tissues. Compared with an electrotome pen, the electrotome guide tube has a small electrode contact surface and relatively small thermal damage to cell tissues. And the treatment under the electrotome catheter mirror not only can completely excise the tumor, but also can ensure that the air passage of the patient is in a smooth state, enlarge the pipe diameter of the air passage, improve the lung function, has small wound during the operation, can effectively reduce the pain of the patient, and can quickly recover the body after the operation and effectively improve the life quality.

Referring to fig. 7 to 11, in order to facilitate the stable operation of the electrotome catheter, in one embodiment, an electrotome catheter assembly is further provided, which includes a locking device 50 and the electrotome catheter described in the above embodiments, wherein the locking device 50 is used in cooperation with a bronchoscope, for example, the insertion tube 40 of the bronchoscope is provided with an interface 41 communicating with its working channel, the locking device 50 is connected to the interface 41, and the electrotome catheter extends into the working channel through the locking device and the interface. The locking device 50 limits and keeps the intervention depth of the electrotome catheter during operation, and can stably and safely perform multiple times of electrosection or electrocoagulation on target tissues.

The locking device 50 comprises a catch 51, a locking head 52 and a straight-through valve 53. Wherein the clip 51 is coupled to the working channel entrance site of the bronchoscope, for example, via the interface 41; the locking head 52 is fixed with the buckle 51 in a thread fit way; the through valve 53 is detachably connected to the locking head 52, for example by screwing. The buckle 51, the locking head 52 and the straight-through valve 53 are mutually butted and are provided with threading channels for the extension of the knife conduit.

Specifically, the end of the interface 41 carries an annular flange structure 42, and the snap 51 and the locking head 52 clamp the fixed flange structure 42. For example, the clip 51 has a notch 510 (U-shaped slot), the flange 42 is disposed in the notch 510, and the flange 42 is clamped and fixed as the clip 51 is screwed with the locking head 52, so that the locking device is firmly mounted on the bronchoscope.

The through valve 53 comprises a movable portion 531 and a fixed portion 532 which are in threaded engagement, wherein the fixed portion 532 and the locking head 52 are in butt joint, and an elastic member is clamped between the movable portion 531 and the fixed portion 532, the elastic member is provided with a through hole, such as silica gel, and the through hole is kept open in a natural state. Along with the rotation of the movable part 531 along the screw thread, the movable part 531 and the fixed part 532 are gradually screwed, the diameter of the through hole of the elastic part is reduced along with the increase of the screwing pressure, and if the electric knife guide pipe is arranged in the through hole in advance, the electric knife guide pipe in the threading channel is hooped after the elastic part is pressed, so that the locking function is realized.

All possible combinations of the technical features of the embodiments described above may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application.

Claims (10)

1. Electrotome catheter, characterized in that it comprises:

a first tube having opposite distal and proximal ends;

the identification ring is fixed on the periphery of the first pipe body;

the proximal end of the electrode is of a cylindrical structure, a fusion hole is formed in the side wall of the cylindrical structure, a part with the fusion hole in the electrode is inserted into the distal end of the first tube body and is fixed in a hot melting mode, and the distal end of the electrode is of a solid structure or a hollow structure extending integrally with the cylindrical structure;

the handle is fixed at the near end of the first pipe body, and a circuit connector connected with the electrode and a pipeline connector communicated with the inside of the first pipe body are arranged on the handle.

2. The electrotome catheter according to claim 1, wherein the fusion holes are plural and arranged circumferentially of the electrode.

3. The electrotome catheter according to claim 1, wherein the first tubular body comprises three sections arranged in sequence from the proximal end to the distal end, wherein the sections near the distal end and the proximal end are hard sections, the middle section is a soft section, each section is made of Pebax and is lined with a stainless steel mesh grid, and the rigidity of each hard section is greater than that of the soft section.

4. The electrotome catheter according to claim 1, wherein the distance between the marker ring and the distal-most end of the electrode is between 5mm and 25 mm.

5. The electrotome catheter according to claim 1, wherein the marker ring is a stainless steel ring.

6. The electrotome catheter according to claim 1, wherein the electrode is hollow and in abutting communication with the first tubular body, the first tubular body having a loosely fitting auxiliary mandrel disposed therein, the auxiliary mandrel having a distal end in the shape of a spherical crown and being configured to extend beyond the distal end of the electrode, the handle having a conduit fitting therethrough for the auxiliary mandrel to extend through.

7. The electrotome catheter according to claim 1, wherein the distal end of the electrode is of solid construction and the side wall of the first tubular body defines a suction opening adjacent the electrode in communication with the interior of the first tubular body.

8. The electrotome catheter according to claim 7, wherein said suction aperture corresponds in position to said fusion aperture.

9. The electrotome catheter of claim 1 wherein the distal tip of the electrode is shaped.

10. An electrotome catheter assembly comprising a locking device and an electrotome catheter according to any one of claims 1 to 9, the locking device comprising:

the buckle is used for being combined with the inlet part of the working channel of the bronchoscope;

the locking head is in threaded fit with the buckle;

the straight-through valve is detachably connected with the locking head;

the buckle, the locking head and the straight-through valve are mutually butted and are provided with threading channels for the electric knife conduit to extend.

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