High-frequency electric knife for endoscopic mucosal dissection

Abstract

The utility model provides a high-frequency electric knife for endoscopic mucosal dissection, which is characterized in that a positioning sleeve and a limiting component are added on the basis of the prior art, the positioning sleeve is fixedly arranged in an outer tube and positioned between a knife head seat and a butt joint tube, and the limiting component comprises a fixing frame, a balance plate and a steel ball, the fixing frame is fixedly welded to the outer side of the far end of the butt joint pipe, the balance plate is arranged in the long axis direction of the butt joint pipe, the two circumferential sides of the balance plate extend downwards to be provided with hanging lugs, the limiting assembly further comprises a pin shaft penetrating through the hanging lugs to connect the balance plate with the fixing frame, a pit is formed in the near end of the balance plate, and the steel ball is located in the pit. The two sides of the pin shaft are each provided with a set of springs, the springs abut against the position between the balance plate and the fixing frame, at least two annular grooves are formed in the inner side of the positioning sleeve in the circumferential direction at intervals, the inhaul cable pushes the butt joint pipe to move forwards, and the steel ball can sequentially enter the two annular grooves so that the position, stretching out of the tool bit base, of the polygonal tool bit can be fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a high-frequency electric cutting knife used for endoscopic mucosal stripping. Background Art

[0002] In endoscopic mucosal dissection, a high-frequency electrosurgical knife (also known as a mucosal cutter) needs to be inserted into the patient's body through the forceps opening of the endoscope. The high-frequency electrosurgical knife generally includes a handle and a blade head that can be moved back and forth by the handle. The high-frequency electrosurgical knife cooperates with the movement of the endoscope to perform lesion marking, excision and minimally invasive surgery. It can be seen from the description of the above operation process that after the doctor inserts the high-frequency electrosurgical knife into the endoscope, the slip ring on the handle must be hooked to prevent the blade head of the high-frequency electrosurgical knife from moving back and forth. If there is any movement, the slip ring on the handle may be touched and moved forward, causing the blade head to extend out by mistake, causing accidental injury to the patient. At the same time, when the doctor uses the high-frequency electrosurgical knife for marking and cutting, the doctor must keep the fingers pushing the slip ring tightly for a long time to keep the knife out of the state, so as to mark and cut. Once the fingers are released, the blade head will retract, which not only reduces the accuracy of the operation, but also causes extremely high fatigue intensity of the operating fingers, while affecting the cutting efficiency and the progress of the operation. Utility Model Content

[0003] The utility model discloses a high-frequency electric cutting knife for endoscopic mucosal stripping, which solves the technical problem that the knife head of the high-frequency electric cutting knife in the prior art cannot maintain the knife position.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is specifically implemented as follows:

[0005] The utility model discloses a high-frequency electric cutter for endoscopic mucosal stripping, which comprises a handle assembly and a cutter head assembly which can be manipulated by the handle assembly to move forward or backward, wherein the handle assembly comprises a handle seat, a slip ring slidably sleeved on the handle seat, an outer tube connected to one end of the handle seat, and a pull cable passing through the outer tube;

[0006] The cutter head assembly includes a cutter head body and a cutter head seat sleeved on one end of an outer tube. The cutter head body includes a polygonal cutter head and a hollow push rod. The middle of the polygonal cutter head penetrates and communicates with the inner cavity of the hollow push rod. A butt joint tube is also provided in the outer tube. The distal end of the butt joint tube is fixedly connected to the hollow push rod, and the proximal end is connected to a cable.

[0007] Among them, a positioning sleeve and a limit assembly are also arranged between the hollow push rod and the cable. The positioning sleeve is fixedly arranged in the outer tube and is located between the cutter head seat and the butt tube. The limit assembly includes a fixing frame, a balancing plate, and a steel ball. The fixing frame is welded and fixed to the outer side of the distal end of the butt tube. The balancing plate is arranged along the long axis direction of the butt tube. Hanging ears are arranged on both sides of the circumference of the balance plate to extend downward. The limit assembly also includes a pin shaft that passes through the hanging ears to connect the balance plate and the fixing frame. A pit is arranged at the proximal end of the balance plate. The steel ball is located in the pit. A group of springs are respectively arranged along both sides of the pin shaft, and the spring abuts between the balancing plate and the fixing frame. At least two annular grooves are arranged at circumferential intervals on the inner side of the positioning sleeve. The cable pushes the butt tube forward, and the steel balls can enter the two annular grooves in turn to fix the position of the polygonal cutter head extending out of the cutter head seat.

[0008] Furthermore, the balance plate is composed of a straight section, an inward bending section and an outward bending section from far to near, the pit is located at the proximal end of the straight section, and the two groups of springs are spaced apart and distributed along the longitudinal direction of the straight section.

[0009] Furthermore, a stop cap is provided on the proximal end of the cutter head seat, the proximal end of the stop cap is a conical surface, and the outwardly bent section of the balance plate is suitable for abutting against the outer wall of the conical surface of the stop cap.

[0010] Furthermore, an annular stop step is provided on the inner wall at the distal end of the positioning sleeve, and the proximal end of the fixing frame extends upward to form a receiving groove. The pull cable pushes the docking tube forward, and the steel ball is blocked by the annular stop step and squeezes the spring at the proximal end of the straight section. The balance plate rotates around the pin shaft, and the steel ball slides from the pit into the receiving groove.

[0011] Furthermore, when the steel ball falls into the receiving groove, the cable is pulled back to make the butt joint tube retreat, and the spring at the far end of the straight section pulls the balance plate to make the balance plate rotate around the pin shaft, and the balance plate is reset.

[0012] Furthermore, a water inlet groove is provided on the side wall of the butt-jointed pipe, and the water inlet groove is communicated with the inner cavity of the hollow push rod.

[0013] Furthermore, the handle assembly also includes a water inlet located at the front end of the handle seat, a Luer joint is arranged on the outer periphery of the water inlet, and the water inlet is connected to the water inlet groove through the gap between the outer tube and the cable.

[0014] Furthermore, the handle assembly also includes an electrode seat located at the front end of the handle seat, and the electrode seat is electrically connected to the polygonal cutter head through a pull cable, a butt tube, and a hollow push rod.

[0015] Beneficial technical effects:

[0016] The high-frequency electric cutting knife for endoscopic mucosal dissection provided by the utility model adds a positioning sleeve and a limiting component on the basis of the existing technology. The positioning sleeve is fixedly arranged in the outer tube and is located between the knife head seat and the butt tube. The limiting component includes a fixing frame, a balancing plate, and a steel ball. The fixing frame is welded and fixed to the outer side of the distal end of the butt tube. The balancing plate is arranged along the long axis direction of the butt tube. Hanging ears are arranged on both sides of the circumference of the balancing plate and extend downward. The limiting component also includes a pin shaft that passes through the hanging ears to connect the balancing plate and the fixing frame. A pit is arranged at the proximal end of the balancing plate. The steel ball is located in the pit. A group of springs are respectively arranged along both sides of the pin shaft. The springs abut between the balancing plate and the fixing frame. At least two annular grooves are arranged at intervals on the inner side of the positioning sleeve at circumferential intervals. The cable pushes the butt tube forward, and the steel balls can enter the two annular grooves in turn to fix the position of the polygonal knife head extending out of the knife head seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the overall structure of a high-frequency electric cutting knife provided by the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of a high-frequency electric cutting knife;

[0020] Figure 3A A schematic diagram of the three-dimensional structure of a five-pointed star-shaped cutter head of the cutter head body provided by the utility model;

[0021] Figure 3B A schematic diagram of the three-dimensional structure of the triangular cutter head of the cutter head body provided by the utility model;

[0022] Figure 3C A schematic diagram of the three-dimensional structure of the hexagonal star-shaped cutter head of the cutter head body provided by the utility model;

[0023] Figure 4 for Figure 2 A local enlarged view of point A in FIG.

[0024] Figure 5 This is a schematic diagram of the main view of the limit assembly of the high-frequency electric cutting knife provided by the utility model;

[0025] Figure 6 This is an exploded schematic diagram of the limit component structure of the high-frequency electric cutting knife provided by the utility model;

[0026] Figure 7 A schematic diagram of the main view of the positioning sleeve structure of the high-frequency electric cutting knife provided by the utility model;

[0027] Figure 8 for Figure 7 AA cross-sectional view in FIG.

[0028] Fig. 9 A schematic cross-sectional view of the cutter head assembly of the high-frequency electric cutter provided by the utility model in the first cutter-out position;

[0029] Fig.10 for Fig. 9 A magnified schematic diagram of the structure at B in

[0030] Fig.11 A schematic cross-sectional view of the cutter head assembly of the high-frequency electric cutting knife provided by the utility model when the cutter head is ready to be retracted;

[0031] Fig.12 for Fig.11 Schematic diagram of the enlarged structure at position C in FIG. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0035] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0037] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0038] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0039] Firstly, it should be noted that the terms "proximal" and "distal" used in this article refer to directions closer to and farther from a user of the device, respectively.

[0040] See also Figure 1-Figure 4 According to the utility model, a high-frequency electric cutting knife 100 for endoscopic mucosal dissection is disclosed. The high-frequency electric cutting knife 100 includes a handle assembly 10 and a blade assembly 20 that can be manipulated by the handle assembly 10 to move forward or backward. The handle assembly 10 includes a handle seat 11, a slip ring 12 slidably mounted on the handle seat 11, an outer tube 16 connected to one end of the handle seat 11, and a cable 17 passing through the outer tube 16.

[0041] The cutter head assembly 20 includes a cutter head body 21 and a cutter head seat 22 sleeved on one end of the outer tube 16. Figure 3A , Figure 3B as well as Figure 3C The cutter head body 21 includes a polygonal cutter head 211 and a hollow push rod 212. The polygonal cutter head 211 and the hollow push rod 212 can be two independent components, and finally welded to form the cutter head body 21. It can be understood that the polygonal cutter head 211 and the hollow push rod 212 can also be integrally formed to form the cutter head body 21. The polygonal cutter head 211 provided in this embodiment can be a polygonal shape such as a triangle, a five-pointed star, a six-pointed star, etc. After the polygonal cutter head 211 extends out of the cutter head seat 22, it can pull the diseased tissue at multiple angles, which is convenient for position marking and cutting the diseased tissue. The middle part of the polygonal cutter head 21 passes through and communicates with the inner cavity of the hollow push rod 22, so that physiological saline can be injected from the inner cavity of the hollow push rod 22 and sprayed out through the middle part of the polygonal cutter head 21 to clean the wound surface. In addition, a butt joint pipe 50 is also provided in the outer tube 16, and the distal end of the butt joint pipe 50 is fixedly connected to the hollow push rod 22, and the proximal end of the butt joint pipe 50 is connected to a pull cable 17.

[0042] Among them, a positioning sleeve 30 and a limit assembly 40 are also arranged between the hollow push rod 22 and the cable 17. Specifically, the cable 17 can be manipulated by the handle assembly 10 to move forward or backward. Since the cable 17 is arranged in the outer tube 16, and a positioning sleeve 30 is also arranged in the outer tube 16 near the cutter head assembly 20, the positioning sleeve 30 is relatively fixed to the outer tube 16, that is, the positioning sleeve 30 is fixed in the outer tube 16 and is located between the cutter head seat 22 and the docking tube 50. During the forward or backward movement of the cable 17, the limit assembly 40 cooperates or disengages with the positioning sleeve 30, so that the length of the cutter head body 21 extending out of the cutter head seat 22 is limited and positioned.

[0043] See also Figure 5 , Figure 6 as well as Fig. 9According to one aspect of this embodiment, the position limiting assembly 40 includes a fixing frame 41, a balancing plate 42, and a steel ball 43. The fixing frame 41 is welded and fixed to the outer side of the distal end of the butt joint pipe 50. Specifically, the fixing frame 41 includes a fixing plate 412 and a support frame 411 extending downward from the lower surface of the fixing plate 412 along both sides. A buckle 411A is formed inward at the lower end of the support frame 411. The butt joint pipe 50 can be passed through the space between the two support frames 411. When the buckle 411A buckles the outer periphery of the butt joint pipe 50, it is convenient to fix the position so as to facilitate the next step of welding operation. The balancing plate 42 is arranged along the long axis direction of the butt joint pipe 50. The balancing plate 42 is arranged on both sides of the circumference of the balancing plate 42 to extend downward. The position limiting assembly 40 also includes a pin 46 that penetrates the hanging ear 425 to connect the balancing plate 42 with the fixing frame 41. In order to facilitate the penetration of the pin 46, a through hole can be provided on the hanging ear 425. The proximal end of the balance plate 42 is provided with a pit 424, the steel ball 43 is located in the pit 424, and a group of springs are respectively provided along both sides of the pin shaft 46. Figure 5-Figure 6 As shown in the figure, spring 44A and spring 44B are respectively abutted between balance plate 42 and fixing frame 41. Specifically, a first groove 413A and a second groove 413B may be provided on fixing plate 412 of fixing frame 41. The first groove 413A corresponds to an accommodation space for one end of spring 44A, and the second groove 413B corresponds to an accommodation space for one end of spring 44B. A raised column 412A is provided on fixing plate 412 between the first groove 413A and the second groove 413B. A strip hole 412B is penetrated on raised column 412. Pin 46 may be penetrated by strip hole 412B and hanging ear 425 to fix balance plate 42 and fixing frame 41 relatively, and balance plate 42 may swing around pin 46.

[0044] See also Figure 7 as well as Figure 8 At least two annular grooves are arranged at circumferential intervals on the inner side of the positioning sleeve 30. In the present embodiment, in order to provide the operator with more options for the positioning length of the knife, three annular grooves are arranged, which are, from far to near, annular groove 32C, annular groove 32B and annular groove 32A. When the cable 17 pushes the docking tube 50 forward, the steel balls 43 can enter these annular grooves in turn, so that the position of the polygonal cutter head 211 extending out of the cutter head seat 22 is fixed, thereby realizing the function of fixing the knife length.

[0045] See also Figure 6 The balance plate 42 includes a straight section 423, an inwardly bent section 422 and an outwardly bent section 421 from far to near, wherein the pit 424 is located at the proximal end of the straight section 423, and the two groups of springs are spaced apart along the longitudinal direction of the straight section 423.

[0046] See also Figure 6, Figure 7 as well as Figure 8 The inner wall of the distal end of the positioning sleeve 30 is also provided with an annular stop step 33, and the proximal end of the fixing frame 41 extends upward to form a receiving groove 45. When the cable 17 pushes the docking tube 50 forward, the steel ball 43 is blocked by the annular stop step 33 and squeezes the spring at the proximal end of the straight section 423, that is, the spring 44B, forcing the balance plate 42 to rotate around the pin 46, and the steel ball 43 slides from the pit 424 into the receiving groove 45. In this process, when the operator completes the surgical operation by operating the high-frequency electric cutting knife 100 provided in this embodiment, the blade body 21 needs to be recovered into the blade seat 22 to avoid accidental injury to other parts of the patient.

[0047] It can be expected that when the steel ball 43 falls into the receiving groove 45, the cable 17 is pulled back to make the connecting tube 50 retreat, and the spring (that is, spring 44A) at the far end of the straight section 42 pulls the balance plate 42, causing the balance plate 42 to rotate around the pin 46, and the balance plate 42 is reset.

[0048] See also Fig.11 The proximal end of the cutter head seat 22 is sleeved with a stop cap 221, and the proximal end of the stop cap 221 is conical. The outwardly bent section 421 of the balance plate 42 is suitable for abutting against the outer wall of the conical surface of the stop cap 221. Specifically, when the outwardly bent section 421 of the balance plate 42 abuts against the outer wall of the conical surface of the stop cap 221, the steel ball 43 is blocked by the annular stop step 33 and squeezes the spring at the proximal end of the straight section 423, that is, the spring 44B, forcing the balance plate 42 to rotate around the pin 46, and the steel ball 43 slides from the pit 424 into the receiving groove 45. Fig.12 The steel ball 43 ′ shown by the dotted line in the middle expresses the state that the steel ball 43 is blocked by the annular stop step 33 and is forced to move backward.

[0049] According to the high-frequency electric cutting knife 100 provided in this embodiment, when cutting tissue, bleeding is inevitable, and bleeding will affect the operator's field of vision, so it is necessary to retain the injection function. Fig.11 A water inlet groove 501 is formed on the side wall of the butt joint 50 , and the water inlet groove 501 is connected to the inner cavity of the hollow push rod 212 .

[0050] For the corresponding Figure 1 and Figure 2The handle assembly 10 also includes a water inlet 13 located at the front end of the handle seat 11, and a Luer connector 14 is arranged on the outer periphery of the water inlet 13. The water inlet 11 is connected to the water inlet groove 501 on the butt joint 50 through the gap between the outer tube 16 and the cable 17. The present embodiment provides a high-frequency electric cutting knife, and it is essential to energize the blade body 21 to achieve the cutting and peeling operation of the diseased tissue. The handle assembly 10 also includes an electrode seat 15 located at the front end of the handle seat 11, and the electrode seat 15 is electrically connected to the polygonal blade head 212 through the cable 17, the butt joint 50, and the hollow push rod 212. Obviously, the electrode seat 15, the cable 17, the butt joint 50, the hollow push rod 212 and the polygonal blade head 212 are all made of conductive materials, such as stainless steel.

[0051] The operating principle of the high-frequency electric cutting knife provided in this embodiment is as follows:

[0052] The high-frequency electric cutting knife 100 is inserted into the clamp hole of the endoscope and follows the endoscope lens into the natural cavity of the human body. When the endoscope lens determines that the target lesion position has been reached, the operator can operate the slip ring 12 to push forward so that the blade body 21 extends out of the blade seat 22. Fig. 9 as well as Fig.10 When the steel ball 43 in the limit assembly 40 is inserted into the annular groove 32A of the positioning sleeve 30, the steel ball 43 will inevitably produce a sound or abnormal movement when it is inserted into the positioning sleeve 30, which is equivalent to giving the operator a feedback signal to inform the operator that the cutter head body 21 is already in the first cutter position state; and when the operator finds that the extension length of the cutter head body 21 is not enough in combination with the endoscope lens, the slip ring 12 can be pushed forward to drive the cable 17 to push the docking tube 50 forward, so that the steel ball 43 leaves the annular groove 32A and enters the next annular groove 32B. At this time, the cutter head body 21 can be moved forward. 21 enters the second knife-out position state. Similarly, when the steel ball 43 enters the annular groove 32C, the length of the cutter head body 21 extending out of the cutter head seat 22 is longer. At this time, the cutter head body 21 enters the third knife-out position state. When the surgeon completes the surgical operation, he continues to push the cable 17 forward to make the steel ball 43 leave the annular groove 32C, and then it can be blocked by the annular stop step 33 on the positioning sleeve 30 and squeeze the spring at the proximal position of the straight section 423, that is, the spring 44B, forcing the balance plate 42 to rotate around the pin shaft 46, and the steel ball 43 slides from the pit 424 into the receiving groove 45. Fig.12 The steel ball 43' shown by the dotted line in the middle expresses the state that the steel ball 43 is blocked by the annular stop step 33 and is forced to move backward. Since the steel ball 43 has fallen into the receiving groove 45, it will no longer cause resistance to the operation of moving the cable 17 backward. At this time, the cutter head body 21 can be smoothly retracted into the cutter head seat 22, specifically, the hollow push rod 212 can be accommodated in the cutter head seat 22.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-frequency electric cutting knife for endoscopic mucosal dissection, the high-frequency electric cutting knife comprising a handle assembly and a blade assembly that can be manipulated by the handle assembly to move forward or backward, the handle assembly comprising a handle seat, a slip ring slidably sleeved on the handle seat, an outer tube connected to one end of the handle seat, and a pull cable inserted in the outer tube; The cutter head assembly includes a cutter head body and a cutter head seat sleeved on one end of the outer tube, the cutter head body includes a polygonal cutter head and a hollow push rod, the middle part of the polygonal cutter head penetrates and communicates with the inner cavity of the hollow push rod, and a butt joint tube is also provided in the outer tube, the distal end of the butt joint tube is fixedly connected to the hollow push rod, and the proximal end is connected to the pull cable; It is characterized in that The cam is provided with a fixing member which is fixed in the outer tube and located between the tool head seat and the butt tube, and the fixing member comprises a fixing frame, a balancing plate and a steel ball, the fixing frame is welded and fixed to the outer side of the distal end of the butt tube, the balancing plate is arranged along the long axis direction of the butt tube, and hanging ears are extended downwardly on both sides of the circumference of the balancing plate, the limiting assembly also comprises a pin shaft which passes through the hanging ears and connects the balancing plate to the fixing frame, a pit is arranged at the proximal end of the balancing plate, the steel ball is located in the pit, a group of springs are respectively arranged along both sides of the pin shaft, the springs abut against the balancing plate and the fixing frame, at least two annular grooves are arranged at intervals on the inner side of the fixing frame at a circumferential direction, the cable pushes the butt tube forward, and the steel ball can enter the two annular grooves in turn to fix the position of the polygonal tool head extending out of the tool head seat.

2. A high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 1, characterized in that: The balance plate comprises a straight section, an inward bending section and an outward bending section from far to near, the pit is located at the proximal end of the straight section, and the two groups of springs are spaced apart and distributed along the longitudinal direction of the straight section.

3. A high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 2, characterized in that: The proximal end of the cutter head seat is sleeved with a stop cap, the proximal end of the stop cap is a conical surface, and the outward bending section of the balance plate is suitable for abutting against the outer wall of the conical surface of the stop cap.

4. A high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 3, characterized in that: The distal inner wall of the positioning sleeve is also provided with an annular stop step, the proximal end of the fixing frame extends upward to form a receiving groove, the pull cable pushes the docking tube forward, the steel ball is blocked by the annular stop step and squeezes the spring at the proximal end of the straight section, the balance plate rotates around the pin shaft, and the steel ball slides from the pit into the receiving groove.

5. A high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 4, characterized in that: When the steel ball falls into the receiving groove, the cable is pulled back to make the butt joint tube retreat, and the spring at the far end of the straight section pulls the balance plate to make the balance plate rotate around the pin shaft, and the balance plate is reset.

6. The high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 1, characterized in that: A water inlet groove is provided on the side wall of the butt joint pipe, and the water inlet groove is communicated with the inner cavity of the hollow push rod.

7. A high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 6, characterized in that: The handle assembly also includes a water inlet located at the front end of the handle seat, a Luer joint is arranged at the outer periphery of the water inlet, and the water inlet is connected to the water inlet groove through the gap between the outer tube and the cable.

8. The high-frequency electric cutting knife for endoscopic mucosal dissection according to claim 1, characterized in that: The handle assembly also includes an electrode seat located at the front end of the handle seat, and the electrode seat is electrically connected to the polygonal cutter head through a pull cable, a butt tube, and a hollow push rod.

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