CN219331885U - High-frequency incision knife for endoscope - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, in particular to a high-frequency incision knife for an endoscope, which comprises a core bar, a first electrode assembly and a second electrode assembly, wherein the first electrode assembly is slidably arranged on the core bar, and the core bar can rotate relative to the second electrode assembly; the first electrode assembly comprises a first electrode, a first conductive pipe fitting and a cutter head, the first electrode is electrically connected with the first conductive pipe fitting, the cutter head is detachably connected to the first conductive pipe fitting and communicated with the first conductive pipe fitting, and a sheath tube is sleeved outside the first conductive pipe fitting; the second electrode assembly comprises a second electrode, a second conductive pipe fitting and a second electrode plug, one end of the second conductive pipe fitting is sleeved outside the sheath tube, the other end of the second conductive pipe fitting is connected with the second electrode plug, the second electrode is arranged on the second conductive pipe fitting, and an endoscope is arranged between the second conductive pipe fitting and the sheath tube.

Description

High-frequency incision knife for endoscope

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a high-frequency incision knife for an endoscope.

Background

The push type endoscopic submucosal dissection (pushing endoscopic submucosal dissection, PESD) has extremely high practical value in the treatment of large-area early cardiac carcinoma and precancerous lesions thereof, can provide higher dissection speed, and simultaneously effectively reduces the complication incidence rate, so that the endoscopic surgery is safer and faster. The incision knife is used as a core tool for the PESD operation and is often divided into a single electrode and a double electrode, the single electrode incision knife has high-frequency current to enter a human body, a negative plate is required to be additionally arranged on the surface of the human body, and the current is led out from the negative plate after entering the human body, but when a metal implant is arranged in the human body, the high-frequency current released by the single electrode can cause the metal implant to scald, so that the damage is caused to a patient; the double-electrode incision knife is characterized in that a layer of metal electrode is added at the front end of the outer sheath tube, the layer of metal electrode is equivalent to an electrode sheet attached to a human body, the diffusion of current in the human body can be reduced, the damage is reduced, but different electrode wires are gathered in the incision knife, and each electrode wire can be wound, so that the actual operation effect is affected.

In order to solve the above technical problems, chinese patent CN111329578A discloses a high-frequency incision knife for an endoscope, which comprises a knife body and an operation part, wherein the knife body comprises a first electrode and a second electrode, the operation part comprises a first electric connector and a second electric connector, and the first electric connector and the second electric connector are respectively electrically connected with the first electrode and the second electrode. The first electric connector and the second electric connector are arranged outside the incision knife, so that the number of parts inside the incision knife is reduced, and wires are prevented from being wound, but the cutter head part of the utility model is still formed by mutually mixing two different wires, so that the cutter head of the incision knife is too thick and heavy, and equipment such as an endoscope cannot be directly installed, and the operation is inconvenient.

Thus, there is a need in the art for providing a high frequency incision knife for endoscopes that provides bipolar operation while preventing excessive electrical connections from affecting the field of view of the physician's operation, and improving ease of operation.

Disclosure of Invention

The utility model aims to provide a high-frequency incision knife for an endoscope, which solves the technical problems that in the prior art, the number of electric joints of a double-electrode incision knife is too large, the operation field of a doctor is influenced, the electric joints are easy to wind, and the doctor operation is not convenient enough.

The technical scheme adopted for solving the technical problems is as follows: the high-frequency incision knife for the endoscope comprises a core bar, a first electrode assembly and a second electrode assembly, wherein the first electrode assembly is slidably arranged on the core bar, and the core bar can rotate relative to the second electrode assembly; the first electrode assembly comprises a first electrode, a first conductive pipe fitting and a cutter head, the first electrode is electrically connected with the first conductive pipe fitting, the cutter head is detachably connected to the first conductive pipe fitting and communicated with the first conductive pipe fitting, and a sheath tube is sleeved outside the first conductive pipe fitting; the second electrode assembly comprises a second electrode, a second conductive pipe fitting and a second electrode plug, one end of the second conductive pipe fitting is sleeved outside the sheath tube, the other end of the second conductive pipe fitting is connected with the second electrode plug, the second electrode is arranged on the second conductive pipe fitting, and an endoscope is arranged between the second conductive pipe fitting and the sheath tube.

Further, the core rod is of a hollow tubular structure, a moving groove is formed in the side wall of the core rod along the axial direction of the core rod, a handle is slidably sleeved on the rod body of the core rod, and the first electrode assembly is located in the handle.

Further, one end threaded connection of first electrode has the electrode holder, and first electrically conductive pipe fitting includes the boosting pipe, and the boosting pipe passes the electrode holder and keeps away from the one end of first electrode and be connected with the electrode holder electricity, electrode holder fixed connection is on the inner wall of handle, and electrode holder slidable inlay card is connected in the removal inslot.

Further, one end of the boosting pipe, which is far away from the tool bit, is connected with a liquid injection pipe, a liquid injection port is arranged on the handle, and the liquid injection pipe is communicated with the liquid injection port; the first conductive pipe fitting further comprises a supporting pipe and a butt joint pipe, and the supporting pipe and the butt joint pipe are arranged between the boosting pipe and the tool bit.

Further, the boosting pipe is hollow, the tool bit is hollow, the liquid injection pipe is fixedly connected to the end part of the boosting pipe and is communicated with the boosting pipe, and the liquid injection port is communicated with the tool bit through the first conductive pipe fitting.

Further, the end part of the core rod is rotatably provided with a core rod seat, and the first conductive pipe fitting penetrates through the core rod seat and can rotate relative to the core rod seat; the core rod seat is internally provided with a sealing gasket, and the first conductive pipe fitting is connected in the sealing gasket in a matching way.

Further, the outside cover of stay tube is equipped with the sheath pipe, the boost tube is connected to stay tube one end, and the stay tube other end is connected to the butt joint pipe, and sheath pipe one end plug is connected in the core bar seat, and the sheath pipe other end plug is connected with insulating cover, and insulating cover is located between sheath pipe and the tool bit, the tool bit is pegged graft in the tip of butt joint pipe and is passed insulating cover slidably.

Further, a water filling port is formed in the core rod seat, the first conductive pipe fitting penetrates through the core rod seat, the sheath tube and the insulating sleeve respectively, the first conductive pipe fitting is rotatably arranged in the core rod seat, the sheath tube and the cutter head, a gap is reserved between the first conductive pipe fitting and the cutter head, and the water filling port is communicated with the gap.

Further, the second conductive pipe fitting comprises a sleeve and a transparent cap, the sleeve is sleeved outside the sheath pipe and is close to the tool bit, the transparent cap is sleeved at the upper end of the sleeve, and the second electrode is sleeved at the other end of the sleeve.

Further, the second conductive pipe fitting further comprises an inert electrode wire, one end of the inert electrode wire is fixedly connected to the outer surface of the second electrode, the other end of the inert electrode wire is fixedly connected with a second electrode plug, and outer jackets are sleeved outside the inert electrode wire and the second electrode plug.

The beneficial effects of the utility model are as follows:

according to the utility model, the second electrode and the second electrode plug are arranged on the sleeve and are positioned outside the incision knife, so that the integral internal structure of the incision knife is effectively reduced, the operation visual field is widened, meanwhile, winding among different electrode wires is prevented, and the operation stability of doctors is improved. Compared with the prior art, the utility model can be additionally provided with the endoscope at the cutter head part of the incision knife during use, greatly improves the operation convenience of the utility model, adopts the transparent cap to face the endoscope, ensures that the operation visual field is wider and the doctor operation is more stable.

Drawings

Fig. 1 is a perspective view of a high-frequency incision knife for an endoscope according to the present utility model.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is a cross-sectional view taken along F-F in fig. 3.

Fig. 5 is an enlarged partial schematic view of the portion a in fig. 4.

Fig. 6 is a partially enlarged schematic view of the portion B in fig. 4.

Fig. 7 is an enlarged partial schematic view of the portion C in fig. 4.

Fig. 8 is a partially enlarged schematic view of the portion D in fig. 4.

Fig. 9 is an enlarged partial schematic view of the portion E in fig. 4.

Fig. 10 is an enlarged partial view of the F portion of fig. 2.

Fig. 11 is a perspective view of an insulating sheath in the high-frequency incision knife for an endoscope of the present utility model.

The components in the drawings are marked as follows: 10. a core bar; 101. an opening; 102. a protrusion; 103. countersink; 11. a handle; 111. a first mating hole; 112. a second mating hole; 12. a moving groove; 13. a core bar seat; 14. a liquid injection pipe; 16. a liquid injection port; 17. a water filling port; 20. a first electrode assembly; 200. a first conductive tube; 21. a first electrode; 22. an electrode base; 23. a boosting pipe; 24. a support tube; 25. a sheath; 26. a sealing gasket; 27. a butt joint pipe; 28. a cutter head; 29. an insulating sleeve; 291. triangular through holes; 30. a second electrode assembly; 300. a second conductive tube; 31. a transparent cap; 32. a sleeve; 321. assembling the cavity; 33. a second electrode; 34. an inert electrode line; 35. a second electrode plug; 36. an outer sheath.

Detailed Description

The present utility model will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the utility model only by way of illustration, and therefore it shows only the constitution related to the utility model.

Referring to fig. 1, the present utility model provides a high-frequency incision for an endoscope, which includes a mandrel 10, a first electrode assembly 20 and a second electrode assembly 30, wherein the first electrode assembly 20 is slidably disposed on the mandrel 10, and the mandrel 10 is rotatable relative to the second electrode assembly 30.

Further, the core rod 10 is in a hollow tubular structure, a moving groove 12 is formed in the side wall of the core rod 10 along the axial direction of the core rod 10, a handle 11 is slidably sleeved on the rod body of the core rod 10, the handle 11 can move up or down along the moving groove 12, the first electrode assembly 20 is located inside the handle 11, and the second electrode assembly 30 is located outside the handle 11.

Specifically, referring to fig. 1 and 5, the handle 11 is provided with a first mating hole 111 and a second mating hole 112, the handle 11 is sleeved on the core rod 10 by using the first mating hole 111, and the axis of the second mating hole 112 is perpendicular to the first mating hole 111 and corresponds to the moving slot 12.

In this embodiment, two hand-held rings (not shown) are formed on opposite side walls of the handle 11 in an outward protruding manner, the two hand-held rings are used for inserting index fingers and middle fingers of medical staff, a push ring (not shown) is arranged at one end of the core bar 10, which is close to the hand-held rings, and the push ring is used for inserting thumbs of the medical staff, and is matched with the push ring by utilizing the hand-held rings, so that the operation of doctors is facilitated.

Further, referring to fig. 1, 2, 5 and 8, the first electrode assembly 20 includes a first electrode 21, a first conductive tube 200 and a tool bit 28, one end of the first conductive tube 200 is detachably connected in the handle 11, the first conductive tube 200 is coaxially arranged with the core bar 10, one end of the first conductive tube 200 is electrically connected to the first electrode 21, and the other end of the first conductive tube 200 is electrically connected to the tool bit 28.

In use, the first electrode 29 is energized and current passes through the first conductive tube 200 to the tool bit 28, achieving an electro-cutting or electro-coagulation effect by utilizing the thermal effect created by the high frequency current.

Specifically, the first electrode 21 is installed in the second mating hole 112, one end of the first electrode 21 is connected with an electrode holder 22 in a threaded manner, the electrode holder 22 is slidably connected in the moving groove 12 in a clamping manner, and in use, the electrode holder 22 moves along the moving groove 12.

The first conductive pipe member 200 includes a boost tube 23, and the boost tube 23 passes through an end of the electrode holder 22 away from the first electrode 21 and is electrically connected to the electrode holder 22.

Preferably, the booster tube 23 and the electrode holder 22 are fixedly connected together by soldering.

When the electrode holder is used, the handle 11 is rotated, the first electrode 21 in the handle 11 and the electrode holder 22 rotate in a following way, the core rod 10 also rotates in a following way under the supporting of the electrode holder 22, so that synchronous movement between the handle 11 and the core rod 10 is realized, the handle 11 is pushed, the first electrode 21 in the handle 11 and the electrode holder 22 move in a following way, and the handle 11 moves along the moving groove 12 on the core rod 10. The booster tube 22 is welded on the electrode base 22, so that the first conductive pipe fitting 200 can move or rotate along with the handle 11, and further, the accurate control of the cutter head 28 at the other end of the first conductive pipe fitting 200 is realized.

Further, one end of the boosting pipe 23 far away from the tool bit 28 is connected with a liquid injection pipe 14, the handle 11 is provided with a liquid injection port 16, the liquid injection pipe 14 is communicated with the liquid injection port 16, the boosting pipe 23 is in a hollow pipe shape, the liquid injection pipe 14 is fixedly connected to the end part of the boosting pipe 23 and is communicated with the boosting pipe 23, the tool bit 28 is in a hollow pipe shape, and the tool bit 28 is detachably connected to the boosting pipe 23 and is communicated with the boosting pipe 23, so that the liquid injection port 16 is communicated with the tool bit 28.

When in use, high-pressure physiological saline is introduced into the boosting pipe 23 from the liquid injection port 16, and is sprayed out from the cutter head 28, so that the liquid injection at the cutting position of the high-frequency incision knife is raised, the mucous membrane is separated from the tissue, and an additional cannula is not needed, so that the operation of a doctor is facilitated.

It will be appreciated that the handle 11 is made of an insulating material, so as to ensure operation safety, and the electrode holder 22 is externally sleeved with a heat shrinkage tube (not shown) to provide insulation effect, enhance rust and corrosion resistance of the vulnerable parts, and prolong the service life of the utility model.

Referring to fig. 3, 4 and 6, the end of the core rod 10 is rotatably provided with a core rod seat 13, and the first conductive tube 200 penetrates the core rod seat 13 and is rotatable relative to the core rod seat 13.

Specifically, a counter bore 103 is arranged in the core rod seat 13, the core rod 10 is connected in the counter bore 103 in a plugging manner, a groove is formed in the side wall of the counter bore 103, an annular protrusion is arranged at the end part of the core rod 10 and is connected in the groove in a clamping manner, and the annular protrusion is matched with the groove, so that the core rod 10 is rotatably arranged in the core rod seat 13; a sealing gasket 26 is arranged in the core rod seat 13 and positioned at the counter bore 103, and the boosting pipe 23 is connected in the sealing gasket 26 in a matching way.

It can be understood that, the end portion of the core rod 10 located in the counter bore 103 is provided with an opening 101, the opening 101 is formed along the axial direction of the core rod 10, the opening 101 penetrates through the inner side wall and the outer side wall of the core rod 10, when the core rod 10 is inserted into the core rod seat 13, the opening 101 is closed, the diameter of the annular protrusion is reduced, so that the core rod 10 is conveniently and fixedly connected into the core rod seat 13, when the annular protrusion on the core rod 10 is fixedly connected into the groove, the opening 101 is reset, and the diameter of the annular protrusion is utilized to restore and be larger than the inner diameter of the counter bore 103, so that the core rod 10 cannot be easily pulled out, thereby improving the use stability. In the present embodiment, the core rod 10 is made of a plastic material, and is capable of achieving insulation, deformation of the opening 101 due to external force, and resetting when the external force is released.

Referring to fig. 6, 7, 8 and 11, the first conductive pipe member 200 further includes a support pipe 24 and a butt joint pipe 27, and the support pipe 24 and the butt joint pipe 27 are disposed between the booster pipe 23 and the cutter head 28.

Further, one end of the supporting tube 24 is connected with the boosting tube 23, the other end of the supporting tube 24 is connected with the butt joint tube 27, a sheath tube 25 is sleeved outside the supporting tube 24, one end of the sheath tube 25 is fixedly connected in the core rod seat 13, the other end of the sheath tube 25 is connected with an insulating sleeve 29 in a plugging manner, the insulating sleeve 29 is positioned between the sheath tube 25 and the cutter head 28, and the cutter head 28 is plugged at the end part of the butt joint tube 27 and slidably penetrates through the insulating sleeve 29. In the present embodiment, the insulating cover 29 is made of an insulating material such as silica gel or rubber.

Further, the first conductive pipe fitting 200 passes through the core rod seat 13, the sheath tube 25 and the insulation sleeve 29, the first conductive pipe fitting 200 is rotatably disposed in the core rod seat 13, the sheath tube 25 and the cutter head 28, and a gap is left, a water filling port 17 is disposed on the core rod seat 13, and the water filling port 17 is communicated with the gap.

Specifically, the insulation sleeve 29 is in a convex structure, a triangular through hole 291 is formed in the insulation sleeve 29, the cutter head 28 penetrates through the triangular through hole 291 and is connected to the butt joint pipe 27 in a plugging manner, and a gap is reserved between the cutter head 28 and the insulation sleeve 29. When in use, the cylindrical shape of the cutter head 28 is utilized, so that the cutter head 28 can rotate in the insulating sleeve 29, and the first conductive pipe fitting 200 can be ensured to rotate freely.

The utility model provides a liquid injection channel by utilizing the gaps among the first conductive pipe fitting 200, the core rod seat 13, the sheath 25 and the insulating sleeve 29, physiological saline is injected from the water injection port 17, and the physiological saline flows out from the gaps, so that doctors can conveniently clean affected parts, and the visual field is ensured to be clear.

Referring to fig. 2, 4, 8 and 9, the second electrode assembly 30 includes a second conductive tube 300, a second electrode 33 and a second electrode plug 35, one end of the second conductive tube 300 is sleeved outside the sheath 25, the other end of the second conductive tube 300 is connected to the second electrode plug 35, and the second electrode 33 is disposed on the second conductive tube 300.

Further, the second conductive tube 300 includes a sleeve 32 and a transparent cap 31, the sleeve 32 is sleeved outside the sheath 25 and is close to the cutter head 28, the transparent cap 31 is sleeved at the upper end of the sleeve 32, and the second electrode 33 is sleeved outside the sleeve 32.

Preferably, the transparent cap 31 is made of high-transmittance PC (polycarbonate).

Specifically, an assembly cavity 321 is formed between the sleeve 32 and the sheath 25, an endoscope (not shown) is mounted in the assembly cavity 321, the endoscope is clamped on the sheath 25 in a matched manner, the sleeve 32 and the transparent cap 31 are sleeved outside the endoscope and are adhered together by glue, so that the endoscope is prevented from falling off, the transparent cap 31 is opposite to the endoscope, the operation field of view is widened through the transparent cap 31, and the doctor operation is stable.

Further, the second conductive tube 300 further includes an inert electrode wire 34, one end of the inert electrode wire 34 is fixedly connected to the outer surface of the second electrode 33, the other end of the inert electrode wire 34 is fixedly connected to the second electrode plug 35, and the outer sheath 36 is sleeved outside both the inert electrode wire 34 and the second electrode plug 35. Preferably, the outer sheath 36 is made of heat shrink tubing.

The outer sheath 36 made of the heat shrink tube provides an insulating effect for the inert electrode wire 34, protects the service life of the inert electrode wire 34, and improves the rust and corrosion resistance of the inert electrode wire 34.

When the electrified tool bit 28 is placed on a human body, current flows out of the tool bit 28 and enters the human body, then flows into the second electrode 33 and flows out of the second electrode plug 35, so that the current is prevented from being spread in the human body, the injury to a patient is reduced, and the operation risk is reduced. The second electrode 33 and the second electrode plug 35 are arranged on the sleeve 32 and are positioned outside the incision knife, so that the internal structure of the incision knife is effectively reduced, the operation visual field is widened, the operation stability of a doctor is improved, and meanwhile, an endoscope can be additionally arranged at the cutter head part of the incision knife, so that the operation portability is greatly improved.

The utility model has the following concrete working modes: energizing the first electrode 21, and allowing current to flow into the booster tube 23, the support tube 24, the butt joint tube 27 in sequence and then to reach the cutter head 28; when the cutter head 28 is placed on a human body, current flows out of the cutter head 28 and enters the human body, after the second electrode 33 contacts the human body, current in the human body flows into the second electrode 33, finally flows out of the second electrode plug 35 through the inert electrode wire 34, and discharging work is completed.

The second electrode 33 and the second electrode plug 35 are arranged on the sleeve 32 and are positioned outside the incision knife, so that the integral internal structure of the incision knife is effectively reduced, the operation visual field is widened, meanwhile, different electrode wires are prevented from being wound, and the operation stability of doctors is improved. When the surgical incision knife is used, the endoscope can be additionally arranged at the cutter head part of the incision knife, so that the operation convenience of the surgical incision knife is greatly improved, and the transparent cap 31 is adopted to face the endoscope, so that the operation visual field is wider, and the doctor operation is more stable.

It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. The high-frequency incision knife for the endoscope is characterized by comprising a core bar (10), a first electrode assembly (20) and a second electrode assembly (30), wherein the first electrode assembly (20) is slidably arranged on the core bar (10), and the core bar (10) can rotate relative to the second electrode assembly (30);

the first electrode assembly (20) comprises a first electrode (21), a first conductive pipe fitting (200) and a cutter head (28), wherein the first electrode (21) is electrically connected with the first conductive pipe fitting (200), the cutter head (28) is detachably connected to the first conductive pipe fitting (200) and communicated with the first conductive pipe fitting (200), and a sheath tube (25) is sleeved outside the first conductive pipe fitting (200);

the second electrode assembly (30) comprises a second electrode (33), a second conductive pipe fitting (300) and a second electrode plug (35), one end of the second conductive pipe fitting (300) is sleeved outside the sheath tube (25), the other end of the second conductive pipe fitting (300) is connected with the second electrode plug (35), the second electrode (33) is arranged on the second conductive pipe fitting (300), and an endoscope is arranged between the second conductive pipe fitting (300) and the sheath tube (25).

2. The high-frequency incision knife for endoscope according to claim 1, wherein the core bar (10) is in a hollow tubular structure, a moving groove (12) is formed in the side wall of the core bar (10) along the axial direction of the core bar (10), a handle (11) is slidably sleeved on the rod body of the core bar (10), and the first electrode assembly (20) is located in the handle (11).

3. The high-frequency incision knife for endoscope according to claim 2, characterized in that one end of the first electrode (21) is connected with an electrode holder (22) in a threaded manner, the first conductive pipe fitting (200) comprises a boosting pipe (23), the boosting pipe (23) penetrates through one end of the electrode holder (22) far away from the first electrode (21) and is electrically connected with the electrode holder (22), the electrode holder (22) is fixedly connected on the inner wall of the handle (11), and the electrode holder (22) is slidably and in a clamping connection in the moving groove (12).

4. The high-frequency incision knife for the endoscope according to claim 3, wherein one end of the boosting pipe (23) far away from the tool bit (28) is connected with a liquid injection pipe (14), a liquid injection port (16) is arranged on the handle (11), and the liquid injection pipe (14) is communicated with the liquid injection port (16); the first conductive pipe fitting (200) further comprises a supporting pipe (24) and a butt joint pipe (27), and the supporting pipe (24) and the butt joint pipe (27) are arranged between the boosting pipe (23) and the cutter head (28).

5. The high-frequency incision knife for endoscope according to claim 4, wherein the boosting tube (23) is hollow, the knife head (28) is hollow, the liquid injection tube (14) is fixedly connected to the end part of the boosting tube (23) and is communicated with the boosting tube (23), and the liquid injection port (16) is communicated with the knife head (28) through the first conductive pipe fitting (200).

6. The high-frequency cutting tool for an endoscope according to claim 4, wherein the core bar (10) is rotatably provided at an end thereof with a core bar holder (13), and the first conductive tube member (200) penetrates the core bar holder (13) and is rotatable with respect to the core bar holder (13); a sealing gasket (26) is arranged in the core rod seat (13), and the first conductive pipe fitting (200) is connected in the sealing gasket (26) in a matching way.

7. The high-frequency incision knife for an endoscope according to claim 6, wherein a sheath tube (25) is sleeved outside the support tube (24), one end of the support tube (24) is connected with the boosting tube (23), the other end of the support tube (24) is connected with the butt joint tube (27), one end of the sheath tube (25) is connected in the core rod seat (13) in a plug-in manner, an insulating sleeve (29) is connected with the other end of the sheath tube (25) in a plug-in manner, the insulating sleeve (29) is positioned between the sheath tube (25) and the cutter head (28), and the cutter head (28) is inserted at the end part of the butt joint tube (27) and slidably penetrates through the insulating sleeve (29).

8. The high-frequency cutting tool for an endoscope according to claim 7, wherein the core rod seat (13) is provided with a water filling port (17), the first conductive pipe fitting (200) penetrates through the core rod seat (13), the sheath tube (25) and the insulating sleeve (29) respectively, the first conductive pipe fitting (200) is rotatably arranged in the core rod seat (13), the sheath tube (25) and the tool bit (28) and is provided with a gap, and the water filling port (17) is communicated with the gap.

9. The high-frequency incision knife for endoscope according to claim 7, characterized in that the second conductive tube member (300) comprises a sleeve (32) and a transparent cap (31), the sleeve (32) is sleeved outside the sheath tube (25) and is close to the knife head (28), the transparent cap (31) is sleeved at the upper end of the sleeve (32), and the second electrode (33) is sleeved at the other end of the sleeve (32).

10. The high-frequency incision knife for an endoscope according to claim 9, wherein the second conductive tube (300) further comprises an inert electrode wire (34), one end of the inert electrode wire (34) is fixedly connected to the outer surface of the second electrode (33), the other end of the inert electrode wire (34) is fixedly connected to a second electrode plug (35), and an outer sheath (36) is sleeved outside both the inert electrode wire (34) and the second electrode plug (35).

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