Electric knife

Abstract

The utility model provides an electric knife. The electric knife comprises a first handle; the outer sheath tube assembly is connected to the first handle; the second handle is arranged on the first handle and can move in the axial direction of the first handle, and a liquid injection opening is formed in the second handle; the scalpel head is connected with the second handle through a conductive assembly so as to stretch out or retract the outer sheath tube assembly under the driving of the second handle, a first liquid injection cavity penetrating through the far end of the scalpel head is formed in the scalpel head, the conductive assembly is at least partially sleeved with the outer sheath tube assembly, and a liquid injection channel is formed between the outer sheath tube assembly and at least part of the conductive assembly; the near end of the liquid injection channel is communicated with the liquid injection port, and the far end of the liquid injection channel is communicated with the first liquid injection cavity; and the first sealing structure is arranged between the near-end side of the liquid injection channel and the far-end side of the liquid injection channel, so that liquid injected from the liquid injection port sequentially flows into the liquid injection channel and the first liquid injection cavity.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to an electrosurgical cutter. Background Technology

[0002] In recent years, with the development of endoscopic technology, endoscopic tissue biopsy, endoscopic mucosal resection, and endoscopic mucosal dissection have been widely used, playing a key role in the detection, diagnosis, and treatment of gastrointestinal bleeding, stricture, polyp removal, and early gastrointestinal cancer.

[0003] During endoscopic-guided ESD surgery, the endoscope first enters the body to locate the lesion. An electrosurgical instrument is then inserted through the endoscopic working channel to mark the area around the lesion. The electrosurgical instrument is then withdrawn, and an injection needle is inserted through the endoscopic working channel into the lesion site to inject submucosal tissue to raise the mucosal tissue to be cut. After injection, the injection needle is withdrawn again, and a suitable electrosurgical instrument is inserted to cut the mucosa. This frequent change of surgical instruments during the operation makes the surgery cumbersome and complicated, prolongs the operation time, and increases the patient's pain. Utility Model Content

[0004] This application provides an electrosurgical knife that integrates injection and cutting functions, which can reduce the number of surgical instrument replacements, shorten operation time, and also seal the liquid injected into the injection channel, reducing the risk of liquid flowing out from other locations.

[0005] This application provides an electric cutting knife, including:

[0006] First handle;

[0007] The outer sheath assembly is connected to the first handle;

[0008] The second handle is mounted on the first handle and can move along the axial direction of the first handle. The second handle is provided with an injection port.

[0009] The cutter head is connected to the second handle via a conductive component, so that the outer sheath assembly can be extended or retracted under the action of the second handle. A first injection chamber is formed inside the cutter head, penetrating the distal end of the cutter head. The outer sheath assembly is at least partially sleeved on the conductive component, and an injection channel is formed between the outer sheath assembly and at least a portion of the conductive component. The proximal end of the injection channel is connected to the injection port, and the distal end of the injection channel is connected to the first injection chamber.

[0010] The first sealing structure is disposed between the proximal side and the distal side of the injection channel so that the liquid injected from the injection port flows sequentially into the injection channel and the first injection chamber.

[0011] In some implementations, the conductive component includes a first conductive element, a conductive component, and a second conductive element connected sequentially from the proximal end to the distal end;

[0012] The proximal end of the first conductive element is connected to the injection port, and the distal end of the second conductive element is electrically connected to the blade head and is connected to the first injection chamber.

[0013] The outer sheath assembly is at least sleeved on the conductive element, the first conductive element, and the second conductive element, and forms a liquid injection channel with at least a portion of the conductive element. The proximal end of the liquid injection channel is connected to the first conductive element, and the distal end of the liquid injection channel is connected to the second conductive element.

[0014] In some implementations, the distal end of the outer sheath assembly extends to the cutter head, and a first sealing structure is disposed inside the outer sheath assembly and located at at least one of the cutter head, the cutter head and the second handle.

[0015] In some implementations, the first sealing structure includes a first sealing element;

[0016] The first seal is disposed between the first conductive element and the outer sheath assembly, and is located on the side of the second handle facing the blade.

[0017] In some implementations, the proximal outer wall of the first seal is attached to the inner wall of the outer sheath assembly, and there is a gap between the distal outer wall of the first seal and the outer sheath assembly, so that liquid can enter the outer wall of the first seal through the gap.

[0018] The first seal is configured to retract toward the first conductive element under liquid pressure.

[0019] In some implementations, the outer sheath assembly includes:

[0020] The protective tube is connected to the first handle via a connector at its proximal end; the power connector is inserted into the connector.

[0021] The outer sheath is located inside the protective tube, with the distal end of the outer sheath extending beyond the distal end of the protective tube. The cutter head can extend or retract into the outer sheath.

[0022] In some implementations, the connector seat extends into the inner side of the protective tube with a connecting part, and the proximal end of the outer sheath is sleeved on the connecting part;

[0023] The first part of the first seal is located between the outer sheath and the first conductive element, and the second part of the first seal extends between the outer sheath and the connecting part.

[0024] In some implementations, a protrusion is formed on one of the outer wall of the connector and the inner wall of the outer sheath, and a groove matching the protrusion is formed on the other of the outer wall of the connector and the inner wall of the outer sheath, with the protrusion embedded in the groove.

[0025] In some implementations, the first sealing structure includes a second sealing element;

[0026] The second seal is disposed between at least one of the second conductive element and the cutter head and the outer sheath assembly;

[0027] The distal end of the injection channel is connected through an inlet provided on the second conductive element, and the second sealing element is located on the side of the inlet facing the cutter head.

[0028] In some implementations, an insulating sleeve is also included, which is disposed on the inner side of the distal end of the outer sheath assembly, and the cutting head is movably inserted through the insulating sleeve.

[0029] The second seal is located on the side of the insulating sleeve facing the conductive component.

[0030] In some implementations, the outer wall of the second seal is connected to the outer sheath assembly, and the cutter head and conductive assembly are movable relative to the second seal.

[0031] In some implementations, a mounting base is also included, which is sealed on the inner wall of the distal end of the outer sheath assembly and located on the side of the insulating sleeve facing the second conductive element, with the cutting head movably passing through the mounting base.

[0032] A mounting cavity is formed on the mounting base, and the second seal is fitted onto the cutter head and located inside the mounting cavity.

[0033] In some implementations, the mounting base also includes an opening and an end wall opposite to the opening, the opening communicating with the mounting cavity and facing the insulating sleeve;

[0034] One end face of the second seal abuts against the insulating sleeve through an opening, and the other end face of the second seal abuts against the side of the end wall facing the mounting cavity. The side of the end wall facing away from the mounting cavity is configured to contact the second conductive element at least during liquid injection of the cutting head.

[0035] In some implementations, a metal component is also included, which is disposed on the cutter head, and a second seal and an insulating sleeve are movably fitted onto the metal component.

[0036] In some implementations, the second seal is fixedly disposed on the outer wall of the second conductive element or at the end of the second conductive element facing the insulating sleeve, so as to move with the cutter head and the conductive assembly.

[0037] In some implementations, a recess is formed on the outer wall of the second conductive element, the second seal is attached to the outer wall of the second conductive element, and at least a portion of the second seal is located on the inner wall of the recess.

[0038] In some implementations, an annular groove is formed at one end of the second conductive element facing the insulating sleeve, a portion of the second sealing element is fitted onto the annular groove, and another portion of the second sealing element is fitted onto the cutting head, so that when the cutting head is in the liquid injection state, the second sealing element abuts against the end face of the insulating sleeve.

[0039] In some implementations, a second sealing structure is also included;

[0040] A second injection cavity is formed inside the second handle and communicates with the injection port. The proximal end of the conductive component extends into the second handle and communicates with the second injection cavity.

[0041] The second sealing structure is disposed between the outer wall of the conductive component and the cavity wall of the second injection chamber.

[0042] In some implementations, the cutter head includes a main body and a bending section;

[0043] The main body is movably inserted into the outer sheath assembly, and the proximal end of the main body is connected to the conductive assembly. The bent part is located at the distal end of the main body and has an angle with the main body.

[0044] The first injection chamber is located inside the main body and extends through the distal end of the main body.

[0045] In some implementations, the main body and the bent part are integrally formed as a single piece; or,

[0046] The cutter head is a separate component consisting of multiple parts connected together.

[0047] In some implementations, the main body includes a first main body and a second main body connected sequentially from the proximal end to the distal end, the first main body being connected to the conductive component and the second main body being connected to the bending portion;

[0048] The outer diameter of the first body is larger than that of the second body, and the first body is used to set the first sealing structure.

[0049] In some implementations, rotating a knob is also included;

[0050] The proximal end of the outer sheath assembly is connected to the first handle via a rotary knob. The rotary knob is fixed relative to the outer sheath assembly and the first handle in the axial direction of the first handle. The rotary knob can rotate relative to the outer sheath assembly and the first handle about the axis of the first handle.

[0051] A conductive component is movably inserted through a rotating knob, which is configured to drive the conductive component and the cutting head to rotate around the axis of a first handle. A first sealing structure is configured to seal the proximal and distal ends of the injection channel after the cutting head has rotated to its position. This application provides an electrosurgical cutter that, by sleeved an outer sheath assembly onto a conductive component, forms an injection channel between the outer sheath assembly and at least a portion of the conductive component. The proximal end of this injection channel communicates with an injection port on a second handle, and the distal end communicates with a first injection chamber of the cutting head. Thus, when injection is required, such as for submucosal injection, liquid can enter the electrosurgical cutter through the injection port of the second handle, flow out of the cutting head through the injection channel and the first injection chamber, and be injected into the submucosal layer to achieve mucosal ablation. After injection, there is no need to change instruments; the cutting head of the electrosurgical cutter can continue to cut the target tissue, reducing the number of surgical instrument changes, shortening the operation time, and minimizing secondary harm to the patient.

[0052] In addition, by providing a first sealing structure between the proximal and distal sides of the injection channel, the liquid injected from the injection port into the electric cutting blade flows sequentially into the injection channel and the first injection chamber, reducing or avoiding the risk of liquid leakage from the proximal and / or distal sides of the injection channel, mitigating or avoiding contamination of structural components such as power connectors on the proximal side of the injection channel by the liquid, and / or mitigating or avoiding liquid leakage from the blade sidewall on the distal side of the injection channel, thus affecting the injection effect. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of an electric cutter provided in an embodiment of this application;

[0055] Figure 2 This is a cross-sectional view of an electric cutting knife provided in an embodiment of this application;

[0056] Figure 3 yes Figure 1 A magnified view of a section at point A in the middle;

[0057] Figure 4 This is a partial cross-sectional view of an electric cutting knife provided in an embodiment of this application. Figure 1 ;

[0058] Figure 5 This is a partial cross-sectional view of an electric cutting knife provided in an embodiment of this application. Figure 2 ;

[0059] Figure 6 This is a partial cross-sectional view of an electric cutting knife provided in an embodiment of this application. Figure 3 ;

[0060] Figure 7 yes Figure 5 A magnified view of the area at point B;

[0061] Figure 8 This is a partial cross-sectional view of an electric cutting knife provided in one embodiment of this application at the distal end of the outer sheath assembly;

[0062] Figure 9 This is a partial cross-sectional view of another electro-cutting knife provided in an embodiment of this application at the distal end of the outer sheath assembly;

[0063] Figure 10 This is a schematic diagram of the structure of a second conductive element provided in an embodiment of this application;

[0064] Figure 11 This is a partial cross-sectional view of another electro-shearing knife provided in an embodiment of this application at the distal end of the outer sheath assembly;

[0065] Figure 12 yes Figure 6 A magnified view of a section at point C;

[0066] Figure 13 This is a schematic diagram of the structure of one type of cutter head provided in an embodiment of this application;

[0067] Figure 14 This is a schematic diagram of another cutter head provided in one embodiment of this application;

[0068] Figure 15 This is a schematic diagram of the structure of another cutter head provided in an embodiment of this application.

[0069] Explanation of reference numerals in the attached figures:

[0070] 100 - First Handle;

[0071] 200 - Outer sheath assembly; 210 - Protective tube; 211 - Connector seat; 211a - Connector; 2111 - Protrusion; 213 - Power connector; 220 - Outer sheath;

[0072] 300 - Second handle; 310 - Second injection chamber; 310a - Injection port; 320 - Fixing seat;

[0073] 400-Cut head; 400a-First injection chamber; 400b-Outlet; 410-Main body; 411-First main body; 412-Second main body; 413-First part; 414-Second part; 420-Bending part;

[0074] 500 - Conductive component; 510 - First conductive element; 510a - First cavity; 510b - Intermediate outlet; 520 - Second conductive element; 521 - Annular groove; 522 - Recessed position; 520a - Second cavity; 520b - Inlet; 530 - Conductive element; 530a - Injection channel; 540 - Fitting part;

[0075] 600 - First sealing structure; 610 - First sealing element; 611 - First part; 612 - Second part; 620 - Second sealing element;

[0076] 700 - Insulating sleeve;

[0077] 800 - Mounting base; 810 - Mounting cavity; 820 - Opening; 830 - End wall;

[0078] 900 - Metal parts;

[0079] 1000 - Rotate the knob;

[0080] 1100 - Second sealing structure. Detailed Implementation

[0081] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0082] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0083] In the description of this application, it should be understood that the terms "upper," "lower," "horizontal," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In this application, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0084] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two entities connected are not linked by an intermediate structure, but are simply connected to form a whole. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0085] In this application, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0086] Figure 1 This is a schematic diagram of the structure of an electric cutting knife provided in one embodiment of this application. Figure 2 This is a cross-sectional view of an electric cutting blade provided in an embodiment of this application. Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle. Figure 4 This is a partial view of an electric cutting knife provided in an embodiment of this application. Figure 1 ; Figure 5 This is a partial cross-sectional view of an electric cutting knife provided in an embodiment of this application. Figure 2 , Figure 6 This is a partial cross-sectional view of an electric cutting knife provided in an embodiment of this application. Figure 3 . Reference Figures 1 to 6 As shown in the figure, this application embodiment provides an electric cutter, including a first handle 100.

[0087] In some examples, the first handle 100 may be a strip-shaped structure with an inner cavity formed therein, and a guide groove formed on the side wall of the first handle 100. The guide groove can extend along the axial direction of the first handle 100 and communicates with the inner cavity of the first handle 100.

[0088] In some examples, in order to operate the first handle 100, a pull ring can be provided at the proximal end of the first handle 100, so that the operator can hold the pull ring and apply force to the first handle 100.

[0089] Reference Figure 1 and Figure 5 As shown, in some examples, the electric cutter may include an outer sheath assembly 200 connected to a first handle 100, for example, the outer sheath assembly 200 may be connected to the distal end of the first handle 100.

[0090] In some examples, the outer sheath assembly 200 is provided with a power connector 213 for connecting to an external power source. The power connector 213 is electrically connected to an external power source to energize the electrical components of the electric cutter.

[0091] Of course, in other examples, the power connector 213 can also be located in other positions, such as the first handle 100, the rotary knob 1000 mentioned below, or the second handle 300. This application embodiment does not limit the position of the power connector 213.

[0092] In some examples, the electric cutter may include a second handle 300 disposed on the first handle 100 and movable along the axial direction of the first handle 100.

[0093] For example, the second handle 300 is sleeved on the first handle 100 and can move along the guide groove of the first handle 100 to drive the structural member connected to the second handle 300 to move along the axial direction of the first handle 100, so as to realize the switching of the electric cutter in different functional states.

[0094] In some examples, the second handle 300 is provided with earrings on both sides so that the operator can hold the two earrings to operate the second handle 300.

[0095] In some examples, the second handle 300 is provided with a liquid injection port 310a for injecting liquid into the liquid injection channel of the electric cutter. Exemplarily, the liquid injection port 310a may be located on the side wall of the second handle 300 to facilitate liquid injection by the operator.

[0096] Reference Figure 6 As shown, in some examples, a second injection chamber 310 is formed within the second handle 300, one end of which communicates with the injection port 310a. It is understood that the injection channel includes the second injection chamber 310.

[0097] Reference Figure 1 , Figure 3 and Figure 4 As shown, in some examples, the electric cutter may include a blade 400 connected to a second handle 300 via a conductive component 500 to extend or retract the outer sheath assembly 200 under the actuation of the second handle 300.

[0098] For example, the proximal end of the conductive component 500 can extend into the inner cavity of the first handle 100 via the distal end of the first handle 100, and the second handle 300 can extend into the inner cavity of the first handle 100 via a guide groove in the side wall of the first handle 100 and connect to the proximal end of the conductive component 500. Thus, as the second handle 300 moves along the guide groove, it can drive the conductive component 500 and the cutting head 400 to move axially along the first handle 100, so that the cutting head 400 extends or retracts into the outer sheath assembly 200.

[0099] For example, during the process of applying an electrosurgical cutter to the lower part of the patient's body, to avoid damage to the patient's internal tissues by the cutter head 400, the second handle 300 can be moved proximally to the first handle 100 so that the cutter head 400 retracts into the outer sheath assembly 200. When it is necessary to use the electrosurgical cutter to cut tissues, the second handle 300 can be moved distally to the first handle 100 so that the cutter head 400 extends a first preset distance distal to the outer sheath assembly 200, allowing the cutter head 400 to cut the target tissue or perform other operations.

[0100] It is understandable that the aforementioned first preset distance can be adaptively adjusted according to the actual surgical needs of the electrosurgical unit, and no restrictions are imposed here.

[0101] In some examples, the cutter head 400 can be electrically connected to the power connector 213 via the conductive component 500. It is understood that the proximal end of the conductive component 500 is electrically connected to the power connector 213, and the distal end of the conductive component 500 is electrically connected to the cutter head 400, thus connecting the cutter head 400 to the power connector 213. In this way, when the power connector 213 is connected to an external power source, power can be supplied to the cutter head 400 through the conductive component 500, enabling the cutter head 400 to perform its cutting function.

[0102] In some examples, the distal end of the conductive component 500 can be electrically connected to the cutter head 400 by means of welding or other methods.

[0103] Reference Figure 5 As shown, in some examples, the power connector 213 can make electrical contact with the conductive component 500. For example, the power connector 213 abuts against the outer wall of the conductive component 500, so that the conductive component 500 can move relative to the first handle 100 and the outer sheath assembly 200 under the action of the second handle 300, and maintain electrical contact with the power connector 213 during the movement.

[0104] Reference Figure 3 and Figure 4As shown, in some examples, a first injection chamber 400a extending through the distal end of the blade head 400 is formed within the blade head 400. For example, an outlet 400b is formed at the distal end of the blade head 400, which communicates with the first injection chamber 400a within the blade head 400. Thus, liquid flowing into the first injection chamber 400a can exit the blade head 400 through the outlet 400b to be injected into the submucosa or other locations, facilitating subsequent rapid peeling of the mucosa.

[0105] It is understandable that the injection channel also includes a second injection chamber 310.

[0106] Reference Figure 4 As shown, in some examples, at least a portion of the outer sheath assembly 200 is fitted onto the conductive assembly 500, forming an injection channel 530a between the outer sheath assembly 200 and at least a portion of the conductive assembly 500. The proximal end of the injection channel 530a communicates with the injection port 310a, and the distal end of the injection channel 530a communicates with the first injection chamber 400a. For example, the proximal end of the injection channel 530a may communicate with the injection port 310a via a second injection chamber 310 within the second handle 300.

[0107] In some examples (not shown in the figures), the outer sheath assembly 200 may form an injection channel 530a between itself and the entire outer wall of the conductive assembly 500, such that the proximal end of the injection channel 530a extends into the second handle 300 and communicates with the second injection chamber 310 within the second handle 300, and the proximal end of the injection channel 530a extends into the cutter head 400 and communicates with the first injection chamber 400a of the cutter head 400. It is understood that the injection flow path also includes the injection channel 530a.

[0108] It should be noted that because the power connector 213 is in electrical contact with the side wall of the conductive component 500, the liquid injection channel 530a needs to be isolated from the power connector 213. The isolation method is not limited here. For example, an extension is formed on the side wall of the conductive component 500, which has an inner cavity for the power connector 213 to be inserted. The liquid injection channel 530a is located on the outer periphery of the extension, that is, the extension isolates the power connector 213 from the liquid injection channel 530a.

[0109] Continue to refer to Figure 4 and Figure 5 As shown, in some examples, the outer sheath assembly 200 may form an injection channel 530a between it and at least a portion of the conductive assembly 500 located on the distal side of the power connector 213.

[0110] For example, the outer diameter of the conductive component 500 is smaller than the inner diameter of the outer sheath assembly 200, such that the gap between the inner wall of the outer sheath assembly 200 and at least part of the outer wall of the conductive component 500 serves as an injection channel 530a.

[0111] For example, the power connector 213 is in electrical contact with the outer wall of the conductive component 500, such that the power connector 213 divides the conductive component 500 into two parts, one part (e.g., the first segment) is located on the proximal side of the power connector 213, and the other part (e.g., the second segment) is located on the distal side of the power connector 213, and an injection channel 530a is formed between the outer sheath assembly 200 and at least a portion of the second segment of the conductive component 500.

[0112] It is understood that the proximal end of the injection channel 530a can be connected to the injection port 310a of the second handle 300 through the inner cavity of the first section of the conductive component 500 itself, or it can be connected to the injection port 310a through other channels. For example, a pipe can be provided on one side of the conductive component 500, with one end of the pipe connected to the injection channel 530a and the other end connected to the second injection chamber 310 of the second handle 300, so that the proximal end of the injection channel 530a is connected to the injection port 310a. The connection method between the proximal end of the injection channel 530a and the injection port 310a is not limited here. It is understood that in this example, the injection flow channel also includes the inner cavity of the first section of the conductive component 500 itself or other channels.

[0113] In some examples, an injection channel 530a may be formed between the outer sheath assembly 200 and the entire second segment of the conductive assembly 500, such that the proximal end of the injection channel 530a extends to the power connector 213 and the distal end of the injection channel 530a extends to the proximal end of the cutter head 400.

[0114] In some examples, an injection channel 530a may be formed between the outer sheath assembly 200 and a portion of the second segment of the conductive assembly 500. For example, an injection channel 530a may be formed between the middle portion of the second segment of the conductive assembly 500 and the outer sheath assembly 200. The proximal end of the injection channel 530a may communicate with a channel at the first segment of the conductive assembly 500 through the internal cavity of the proximal portion of the second segment of the conductive assembly 500 or other channels (part of the injection flow channel) to communicate with the injection port 310a. The distal end of the injection channel 530a may communicate with the first injection chamber 400a through the internal cavity of the distal portion of the second segment of the conductive assembly 500 or other channels (part of the injection flow channel).

[0115] In some examples, the outer sheath assembly 200 may form an injection channel 530a between itself and the distal portion of the second segment of the conductive assembly 500, such that the distal end of the injection channel 530a extends to the proximal end of the cutter head 400, and the proximal end of the injection channel 530a communicates with the injection port 310a through a channel (part of the injection flow path) formed at other parts of the second segment of the conductive assembly 500.

[0116] Of course, in other examples, the outer sheath assembly 200 may form an injection channel 530a between itself and the proximal portion of the second segment of the conductive assembly 500, such that the distal end of the injection channel 530a communicates with the first injection chamber 400a through a channel formed at another part of the second segment of the conductive assembly 500, the proximal end of the injection channel 530a extends to the power connector 213, and communicates with the injection port 310a through a channel formed at the first segment of the conductive assembly 500.

[0117] This application embodiment does not restrict the position and length of the injection channel 530a. As long as the injection channel 530a is located on the far side of the power connector 213 and is connected to the injection port 310a, and the far end of the injection channel 530a is connected to the first injection chamber 400a of the cutter head 400, it is acceptable.

[0118] Thus, when liquid injection is required, such as for injection into the submucosal layer, the liquid can enter the electrosurgical cutter through the injection port 310a of the second handle 300, and flow out of the cutter head 400 through the injection channel 530a and the first injection chamber 400a, and be injected into the submucosal layer to achieve the peeling of the mucosa.

[0119] Understandably, after the injection, there is no need to change the instruments. The target tissue can continue to be cut using the 400-degree tip of the electrosurgical cutter. This reduces the number of times surgical instruments need to be changed, shortens the operation time, and also reduces secondary harm to the patient.

[0120] Reference Figure 3 As shown, in some examples, the blade 400 is a hook blade. For example, the blade 400 may include a main body 410 and a bent portion 420. The main body 410 is movably inserted into the outer sheath assembly 200, and the proximal end of the main body 410 is connected to the conductive assembly 500. The bent portion 420 is located at the distal end of the main body 410 and has an angle with the main body 410.

[0121] The included angle can be an acute angle, a right angle, or an obtuse angle. This application embodiment does not limit the angle of the included angle, and it can be adjusted according to the actual cutting requirements.

[0122] The bend 420 increases the contact area between the cutter head 400 and the tissue, thereby improving the cutting efficiency of the cutter head 400.

[0123] In some examples, the first injection chamber 400a is located within the main body 410 and extends through the distal end of the main body 410. For example, the first injection chamber 400a is located on the axis of the main body 410, and the outlet 400b is located on the distal end face of the main body 410. This increases the flow rate of the liquid flowing out of the outlet 400b, thereby facilitating the rapid peeling of the submucosa by impacting it with the liquid.

[0124] By configuring the blade 400 as a hook blade structure, it is beneficial to quickly lift and electrically cut the mucosa. Because during the lifting and cutting process, the direction of movement of the hook blade is away from the wound surface being cut, which is very helpful in preventing accidental perforation during the operation. In order to complete the cutting of the wound tissue, the direction of the hook tip (e.g., the bending part 420) needs to be constantly adjusted during the cutting process. Therefore, the hook blade needs to have the basic function of blade head rotation.

[0125] The hook knife with injection function, in addition to its rotating blade, adds a liquid output function to the head. This design makes it easier for the operator to inject fluid into the submucosal layer during breaks in wound cutting, further improving the safety of hook knife use and avoiding the drawbacks of frequent instrument changes. (Refer to...) Figure 1 and Figure 6 As shown, in some examples, the electric cutter may also include a rotary knob 1000, the proximal end of the outer sheath assembly 200 being connected to the first handle 100 via the rotary knob 1000. The rotary knob 1000 is relatively fixed relative to the outer sheath assembly 200 and the first handle 100 in the axial direction of the first handle 100, such that the first handle 100, the rotary knob 1000, and the outer sheath assembly 200 are relatively stationary in the axial direction of the first handle 100, and can move synchronously along the axial direction of the first handle 100.

[0126] It should be noted that, Figure 2 The dashed line l represents the axis of the first handle 100. It can be understood that the axis of the first handle 100 can be the axis of the entire electric cutter.

[0127] In some examples, the rotary knob 1000 can rotate about the axis l of the first handle 100 relative to the outer sheath assembly 200 and the first handle 100. For example, one end of the rotary knob 1000 can be axially limited to the proximal end of the outer sheath assembly 200 through structures such as annular protrusions and grooves, ensuring that the rotary knob 1000 can rotate about the axis of the outer sheath assembly 200 relative to the proximal end of the outer sheath assembly 200. Similarly, one end of the rotary knob 1000 can be axially limited to the distal end of the first handle 100 through structures such as annular protrusions and grooves, ensuring that the rotary knob 1000 can rotate about the axis of the first handle 100 relative to the distal end of the first handle 100.

[0128] Understandably, the axis of the outer sheath assembly 200 may coincide with the axis of the first handle 100.

[0129] Reference Figure 6 As shown, in some examples, the conductive component 500 is movably disposed through the rotary knob 1000, which is configured to drive the conductive component 500 and the blade 400 to rotate about the axis of the first handle 100.

[0130] For example, the conductive component 500 is provided with a mating part 540. Rotating the knob 1000 engages with the mating part 540 to drive the conductive component 500 to rotate around the axis of the first handle 100.

[0131] For example, the mating part 540 may be a protrusion formed on the conductive component 500, and a recess 522 is formed on the inner wall of the rotating knob 1000. The recess 522 extends along the length direction of the rotating knob 1000, and the protrusion is located in the recess 522. In this way, when the rotating knob 1000 moves axially, it will not drive the conductive component 500 to move through the mating part 540. When rotating around the axis of the first handle 100, the conductive component 500 can be driven to rotate around the axis of the first handle 100 by abutting the protrusion, thereby driving the bent part 420 of the cutter head 400 to rotate, so as to change the direction of the bent part 420.

[0132] Of course, the mating part 540 can also be other structures, which are not limited here, as long as it can ensure that the rotating knob 1000 can drive the conductive component 500 to rotate through the mating part 540.

[0133] With the addition of the liquid injection function, considering the safety and effectiveness of the instrument, it is necessary to complete the channel design for the entire flow process of the liquid from input to output, as well as to prevent liquid leakage. For example, when liquid is injected after the cutter head 400 has rotated to the position, the sealing of the entire hydraulic system of the electric cutter is particularly important. Figure 7 yes Figure 5 A magnified view of the area at point B. Figure 8 This is a partial cross-sectional view of an electric cutting knife provided in one embodiment of this application at the distal end of the outer sheath assembly. (Refer to...) Figure 7 and Figure 8 As shown, in some examples, the electric cutting knife may also include a first sealing structure 600, which is disposed between the proximal side and the distal side of the injection channel 530a, so that the liquid injected from the injection port 310a flows sequentially into the injection channel 530a and the first injection chamber 400a, thereby reducing or preventing liquid leakage from other locations near or far from the injection channel 530a.

[0134] It should be noted that the proximal side of the injection channel 530a refers to the proximal end of the injection channel 530a and the adjacent position (outside the injection channel 530a) at a second preset distance from the proximal end. Similarly, the distal side of the injection channel 530a refers to the distal end of the injection channel 530a and the adjacent position (outside the injection channel 530a) at a second preset distance from the distal end. This embodiment does not limit the second preset distance.

[0135] For example, a first sealing structure 600 can be provided on the proximal side of the injection channel 530a to reduce or avoid the risk of liquid leakage from other locations on the proximal side of the injection channel 530a, and to mitigate or avoid contamination of structural components such as the power connector 213 on the proximal side of the injection channel 530a by the liquid.

[0136] For example, a first sealing structure 600 can be provided at the distal end of the injection channel 530a to reduce the risk of liquid leakage from other locations at the distal end of the injection channel 530a, alleviate or prevent liquid from flowing out from the side wall of the cutter head 400 at the distal end of the injection channel 530a, thus affecting the injection effect. This allows the liquid to enter the first injection chamber 400a of the cutter head 400 to a greater extent through the injection channel 530a and flow out through the outlet 400b at the distal end of the cutter head 400, thereby improving the injection effect.

[0137] Of course, in some examples, a first sealing structure 600 may be provided on both the proximal and distal sides of the injection channel 530a.

[0138] The first sealing structure 600 of this application embodiment is configured to seal the proximal side and the distal side of the injection channel 530a after the cutter head 400 is rotated into position, so as to reduce or avoid the risk of liquid leakage from the proximal side and the distal side in the injection channel 530a during the injection process.

[0139] For example, during the cutting of the target tissue in the submucosa, the conductive component 500 and the cutting head 400 rotate around the axis l of the electric cutting blade. After the cutting head 400 rotates to its position, liquid is injected into the submucosa. During this process, the setting of the first sealing structure allows the liquid to flow into the submucosa from the injection port 310a of the cutting head to a greater extent, increasing the impact force on the submucosa and causing the submucosa to bulge rapidly, thereby facilitating the cutting of the target tissue in the submucosa.

[0140] In addition, this also ensures that after the cutter head 400 is rotated into position, the liquid will not leak from the proximal side of the injection channel 530a during injection, thereby reducing or avoiding contamination of the proximal structural components of the injection channel 530a, such as the power connector 213.

[0141] Reference Figure 4 As shown, in some examples, the conductive component 500 may include a first conductive element 510, a conductive element 530, and a second conductive element 520 connected sequentially from proximal to distal end. The proximal end of the first conductive element 510 is connected to the injection port 310a.

[0142] In some examples, the proximal end of the first conductive element 510 extends into the second injection chamber 310 of the second handle 300 and communicates with the injection port 310a through the second injection chamber 310. Additionally, the first conductive element 510 is fixedly connected to the second handle 300 so that it can move relative to the first handle 100 and the outer sheath assembly 200 under the action of the second handle 300. A power connector 213 is electrically connected to the first conductive element 510; for example, the power connector 213 makes electrical contact with the outer side wall of the first conductive element 510. The distal end of the first conductive element 510 is connected to the proximal end of the conductive element 530.

[0143] In some examples, the distal end of the second conductive element 520 is electrically connected to the cutter head 400 and communicates with the first injection chamber 400a, and the proximal end of the second conductive element 520 is connected to the distal end of the conductive element 530.

[0144] In some examples, the distal end of the first conductive element 510 and the conductive element 530 can be connected by welding, sleeve, or snap-fit, and the connection method between the first conductive element 510 and the conductive element 530 is not restricted here. Similarly, the connection method between the proximal end of the second conductive element 520 and the conductive element 530, the connection method between the proximal end of the first conductive element 510 and the second handle 300, and the connection method between the distal end of the second conductive element 520 and the cutter head 400 are not restricted.

[0145] The conductive element 530 can reduce the stiffness of the conductive component 500 and increase the degree of freedom of movement of the conductive component 500, so that the blade 400 at the distal end of the conductive component 500 can be radially deflected or axially extended and retracted according to the actual surgical needs (the second handle 300 remains stationary), thereby improving the surgical accuracy of the electrosurgical cutter.

[0146] For example, the conductive element 530 can be a structure such as a metal wire or a sodium hypochlorite tube; the structure of the conductive element 530 is not limited here.

[0147] In some examples, the first conductive element 510 and the second conductive element 520 may be tubular. Exemplarily, the tubular element may be any shape, such as a circular tube, a barrel-shaped polygonal tube, etc., and the structure of the first conductive element 510 and the second conductive element 520 is not limited here. In some examples, the outer sheath assembly 200 is at least sleeved on the conductive element 530, the first conductive element 510, and the second conductive element 520, and forms a liquid injection channel 530a between it and at least a portion of the conductive element 530.

[0148] It is understandable that the outer diameter of the conductive element 530 is smaller than that of the first conductive element 510 or the second conductive element 520, so that the gap between the conductive element 530 and the outer sheath assembly 200 can be used as a liquid injection channel 530a for liquid flow.

[0149] In some examples, the proximal end of the injection channel 530a is connected to the first conductive element 510, and the distal end of the injection channel 530a is connected to the second conductive element 520. For example, the first cavity 510a of the first conductive element 510 can serve as a channel for liquid flow, enabling the proximal end of the injection channel 530a to connect with the injection port 310a on the second handle 300, and the second cavity 520a of the second conductive element 520 can serve as a channel for liquid flow, enabling the distal end of the injection channel 530a to connect with the first injection cavity 400a on the cutter head 400, thereby simplifying the structural design of the liquid flow channel within the electric cutting knife.

[0150] In some examples, the distal end of the first conductive element 510 may have an intermediate liquid outlet 510b, and the proximal end of the liquid injection channel 530a may be connected to the first cavity 510a of the first conductive element 510 through the intermediate liquid outlet 510b.

[0151] For example, the intermediate outlet 510b can be disposed on the distal end face of the first conductive element 510 or on the distal sidewall of the first conductive element 510, depending on the connection position between the conductive element 530 and the first conductive element 510. For instance, if the proximal end of the conductive element 530 is connected to the distal end face of the first conductive element 510, the intermediate outlet 510b can be disposed on the distal sidewall of the first conductive element 510.

[0152] In some examples, the proximal end of the second conductive element 520 may have an inlet 520b, and the distal end of the injection channel 530a may be connected to the second cavity 520a of the second conductive element 520 through the inlet 520b.

[0153] For example, the liquid inlet 520b can be disposed on the proximal end face of the second conductive element 520, or on the side wall of the proximal end of the second conductive element 520. The specific arrangement can be adjusted according to the connection position between the conductive element 530 and the second conductive element 520, which will not be elaborated here.

[0154] In some examples, the distal end of the outer sheath assembly 200 extends onto the blade head 400, and a first sealing structure 600 is disposed inside the outer sheath assembly 200 and located at at least one of the blade head 400 and the second handle 300 to restrict the flow of liquid in the injection channel 530a through the gap between the outer sheath assembly 200 and the blade head 400.

[0155] For example, when the power connector 213 is disposed on the outer sheath assembly 200, the first sealing structure 600 may be disposed at at least one of the blade 400 and between the blade 400 and the power connector 213.

[0156] In addition, when the first sealing structure 600 is disposed between the cutter head 400 and the second handle 300, it can restrict the liquid in the injection channel 530a from flowing into the second handle 300 through the inner wall of the outer sheath assembly 200. For example, when the first sealing structure 600 is disposed between the cutter head 400 and the power connector 213, it can restrict the liquid in the injection channel 530a from flowing into the power connector 213 through the inner wall of the outer sheath assembly 200. That is, the liquid located outside the entire injection channel is restricted to the area between the cutter head 400 and the power connector 213, preventing the liquid outside the injection channel from flowing out from the side wall of the cutter head 400 or entering the power connector 213 and contaminating the power connector 213.

[0157] For ease of description, the entire flow channel from the injection port 310a to the outlet 400b can be referred to as the injection flow channel. For example, the second injection chamber 310, the first tube 510a, the injection channel 530a, the second tube 520a, and the first injection chamber 400a can be referred to as the injection flow channel as a whole.

[0158] Reference Figure 7 As shown, in some examples, the first sealing structure 600 includes a first seal 610 disposed between the first conductive element 510 and the outer sheath assembly 200, and located on the side of the second handle 300 facing the blade 400, so as to stop the liquid in the injection channel 530a from flowing into the second handle 300 from the side of the second handle 300 facing the blade 400. In this way, the liquid in the injection channel 530a can be prevented from flowing into the second handle 300 from the gap between the first conductive element 510 and the outer sheath assembly 200.

[0159] For example, when the power connector 213 is disposed on the outer sheath assembly 200, the first seal 610 may be located on the side of the power connector 213 facing the blade 400 to stop the liquid in the injection channel 530a from flowing into the power connector 213 on the side facing the blade 400 (i.e., the distal side of the power connector 213). In this way, the liquid in the injection channel 530a can be prevented from flowing into the power connector 213 from the gap between the first conductive member 510 and the outer sheath assembly 200, thus preventing contamination of the power connector 213 and ensuring the normal operation of the power connector 213.

[0160] In some examples, the first seal 610 can be an annular structure, which is sleeved on the first conductive member 510, and the outer sheath assembly 200 is sleeved on the first seal 610, so that the annular gap between the first conductive member 510 and the outer sheath assembly 200 is filled by the first seal 610 to achieve a sealing effect.

[0161] In some examples, the first seal 610 can be a sealing ring. For example, the sealing ring can be a rubber or silicone sealing ring.

[0162] In some examples, the first seal 610 may include, but is not limited to, a heat-shrinkable film. For example, the proximal outer wall of the first seal 610 is attached to the inner wall of the outer sheath assembly 200, and a gap exists between the distal outer wall of the first seal 610 and the outer sheath assembly 200 to allow liquid to enter the outer wall of the first seal 610 through the gap. The first seal 610 is configured to contract towards the first conductive element 510 under liquid pressure.

[0163] It should be noted that, in the embodiments of this application, the proximal end of a component refers to the proximal end of the component and the portion (a portion on a component) located at a third preset distance from the proximal end. For example, the proximal end of the first seal 610 can be understood as the proximal end of the first seal 610 and the portion of the outer wall located at a third preset distance from the proximal end.

[0164] Similarly, in the embodiments of this application, the distal end of a component refers to the distal end of the component and the portion (a portion on the component) located at a third preset distance from the distal end. For example, the distal end of the first seal 610 can be understood as the distal end of the first seal 610 and the portion located at a third preset distance from the distal end.

[0165] The aforementioned third preset distance can be adjusted according to the overall length of a certain component. For example, the aforementioned third preset distance can be a suitable length value such as 1 / 4 of the overall length of a certain component. There is no limitation on the preset distance here.

[0166] By creating a gap between the distal outer wall of the first seal 610 and the inner wall of the outer sheath assembly 200, liquid in the injection channel 530a can enter the outer wall of the first seal 610 along this gap and compress the first seal 610, causing the inner wall of the first seal 610 to contract towards the first conductive element 510. This increases the tightness of contact between the first seal 610 and the first conductive element 510, improving the sealing performance between the distal portion of the first seal 610 and the first conductive element 510. Furthermore, by attaching the proximal outer wall of the first seal 610 to the inner wall of the outer sheath assembly 200, the sealing performance between the distal portion of the first seal 610 and the outer sheath assembly 200 can be guaranteed.

[0167] In this way, the sealing performance between the first seal 610 and the outer sheath assembly 200 and the first conductive element 510 can be guaranteed throughout the entire extension direction, reducing or preventing liquid in the injection channel 530a from entering the power connector 213 through the gap between the first seal 610 and the outer sheath assembly 200, and also reducing or preventing liquid in the injection channel 530a from entering the power connector 213 through the gap between the first seal 610 and the first conductive element 510, thus preventing contamination of the power connector 213.

[0168] Furthermore, by attaching the proximal outer wall of the first seal 610 to the inner wall of the outer sheath assembly 200, and the distal sidewall of the first seal 610 contracting towards the first conductive element under the pressure of the liquid, the adhesion between the distal sidewall of the first seal 610 and the first conductive element is weaker in the absence of liquid. This allows the cutter head 400 and the conductive assembly 500 to move smoothly relative to the first seal 610 during extension or rotation in the non-liquid-filling state, reducing the friction between the conductive assembly 500 (e.g., the first conductive element 500) and the first seal 610 during movement or rotation. This ensures the stability of the first seal 610 during the movement of the conductive assembly 510, thereby ensuring the controllable position of the first seal 610 in the liquid-filling state and achieving effective sealing of the proximal side of the liquid-filling channel 530a.

[0169] In some examples, the distal end of the first seal 610 may extend to the distal end of the first conductive member 510, or it may not extend to the distal end of the first conductive member 510. For example, the distal end of the first seal 610 may extend to a position at a first distance from the distal end of the first conductive member 510. The first distance may be a suitable length such as 1 / 3 or 1 / 4 of the extended length of the first conductive member 510.

[0170] In some examples, the proximal end of the first seal 610 may extend to the side of the power connector 213 facing the cutter head 400, or it may not extend to the power connector 213. For example, the proximal end of the first seal 610 may extend to a position at a second distance from the power connector 213. This application embodiment does not limit the second distance, and it can be adjusted according to actual needs.

[0171] Continue to refer to Figure 1 , Figure 4 and Figure 5 In some examples, the outer sheath assembly 200 may include a protective tube 210 and an outer sheath 220, wherein the proximal end of the protective tube 210 is connected to the first handle 100 via a connector 211; a power connector 213 is inserted into the connector 211; the outer sheath 220 is disposed inside the protective tube 210, and the distal end of the outer sheath 220 extends beyond the distal end of the protective tube 210; and the cutter head 400 may extend or retract into the outer sheath 220.

[0172] In this example, a portion of the conductive component 500 passes through the outer sheath 220 and another portion passes through the protective tube 210, and is connected to the second handle 300 so that it can extend and retract relative to the outer sheath 220 and the protective tube 210 under the action of the second handle 300.

[0173] It is understood that the connector 211 has a through channel intersecting the axis of the protective tube 210, which passes through both ends of the connector 211. The power connector 213 is disposed inside the connector 211, and the end of the power connector 213 away from the conductive component 500 extends out of the outer end of the connector 211 to connect with an external power source. The end of the power connector 213 close to the conductive component 500 extends out of the inner end of the connector 211 and makes electrical contact with the conductive component 500, such as the first conductive element 510.

[0174] The protective tube 210 is designed to protect the outer sheath tube 220 and prevent it from bending.

[0175] In some examples, the outer sheath assembly 200 may also include only an outer sheath 220 or a protective tube 210, one end of which is connected to the first handle 100, and the other end of which is used for the extension or retraction of the cutter head 400 to protect the cutter head 400. This application does not limit the structural configuration of the outer sheath assembly 200, as long as it serves the purpose of protecting the cutter head 400.

[0176] In some examples, the connector 211 extends into the inner side of the protective tube 210 with a connecting portion 211a, and the proximal end of the outer sheath 220 is sleeved on the connecting portion 211a to achieve the connection between the outer sheath 220 and the protective tube 210.

[0177] Reference Figure 7 As shown, in some examples, when the proximal end of the outer sheath 220 is sleeved on the connecting part 211a, it can be welded to the connecting part 211a, or connected to the connecting part 211a by a snap fastener. The embodiments of this application do not limit the connection method between the outer sheath 220 and the connecting part 211a, as long as the outer sheath 220 and the connecting part 211a can be fixedly connected.

[0178] For example, a protrusion 2111 may be formed on one of the outer sidewall of the connecting portion 211a and the inner sidewall of the outer sheath 220, and a groove matching the protrusion 2111 may be formed on the other of the outer sidewall of the connecting portion 211a and the inner sidewall of the outer sheath 220. The protrusion 2111 is embedded in the groove to increase the contact area between the outer sheath 220 and the connecting portion 211a, thereby improving the assembly stability of the outer sheath 220 and the connecting portion 211a in the axial direction of the outer sheath 220, and also improving the contact sealing between the outer sheath 220 and the connecting portion 211a.

[0179] For example, a protrusion 2111 may be formed on the outer side wall of the connecting part 211a, and a groove matching the protrusion 2111 may be formed on the inner side wall of the outer sheath tube 220, with the protrusion 2111 being embedded in the groove.

[0180] In some examples, multiple spaced protrusions 2111 and corresponding grooves can be provided along the axial direction of the outer sheath 220 to further improve the assembly stability of the outer sheath 220 and the connecting part 211a in the axial direction of the outer sheath 220.

[0181] In some examples, a first portion 611 of the first seal 610 is located between the outer sheath 220 and the first conductive element 510, and a second portion 612 of the first seal 610 extends between the outer sheath 220 and the connecting portion 211a.

[0182] It is understandable that a step is formed between the distal end of the connecting part 211a and the outer wall of the first conductive member 510. When a part of the outer sheath 220 is sleeved on the connecting part 211a, a transition space is formed between the outer sheath 220 and the distal end of the connecting part 211a. This transition space is prone to accumulating liquid, which can cause the liquid to seep into the power connector 213 through the gap between the outer sheath 220 and the connecting part 211a, or through the gap between the connecting part 211a and the first conductive member 510.

[0183] In this embodiment, the first portion 611 of the first seal 610 is located between the outer sheath 220 and the first conductive member 510, and the second portion 612 of the first seal 610 extends between the outer sheath 220 and the connecting portion 211a. That is, the first seal 610 covers the aforementioned transition space. Thus, when the distal end of the first seal 610 is in close contact with the first conductive member 510 and the proximal end of the first seal 610 is in close contact with the outer sheath 220, the liquid in the injection channel 530a cannot enter the transition space, and therefore cannot penetrate to the power connector 213.

[0184] In some examples, the proximal end of the first seal 610 may extend to the proximal end of the outer sheath 220. For example, the distal portion of the first seal 610 may be attached to the side wall of the outer sheath 220 with a groove to increase the contact area between the first seal 610 and the inner wall of the outer sheath 220, thereby increasing the sealing performance between the first seal 610 and the inner wall of the outer sheath 220.

[0185] In some examples, the proximal end of the first seal 610 may also extend to the distal end of the first protrusion 2111 near the tip 400 of the connection 211a. The protrusion 2111 can limit the first seal 610 in the axial direction of the outer sheath assembly 200, so as to avoid the first seal 610 from being affected in the axial direction when the conductive component 500 drives the tip 400 to move axially relative to the outer sheath 220.

[0186] This application embodiment does not limit the extension length or extension position of the first seal 610.

[0187] Figure 9 This is a partial cross-sectional view of another electrosurgical cutter provided in one embodiment of this application at the distal end of the outer sheath assembly. Figure 10 This is a schematic diagram of the structure of a second conductive element provided in an embodiment of this application. Figure 11 This is a partial cross-sectional view of another electrosurgical cutter provided in an embodiment of this application at the distal end of the outer sheath assembly. (Refer to...) Figures 8 to 11 As shown, in some examples, the first sealing structure 600 includes a second seal 620 disposed between at least one of the second conductive element 520 and the blade head 400 and the outer sheath assembly 200. The distal end of the injection channel 530a is connected through an inlet 520b disposed on the second conductive element 520, and the second seal 620 is located on the side of the inlet 520b facing the blade head 400.

[0188] Thus, while ensuring that the liquid in the injection channel 530a can enter the second cavity 520a of the second conductive element 520 through the inlet 520b, the second sealing element 620 can seal the gap between the second conductive element 520 (or the cutter head 400) and the outer sheath assembly 200, reducing or preventing the liquid in the injection channel 530a from entering the outer wall of the cutter head 400 through this gap and flowing out of the distal end of the electric cutting blade through the outer wall of the cutter head 400. This allows the liquid in the injection channel 530a to flow out of the electric cutting blade through the first injection cavity 400a and the outlet 400b of the cutter head 400 to a greater extent, thereby increasing the liquid pressure at the outlet 400b and ensuring the impact peeling effect on the submucosal layer.

[0189] For example, the second seal 620 may be sleeved between the second conductive member 520 and the outer sheath assembly 200 (e.g., outer sheath 220), or it may be sleeved between the cutter head 400 and the outer sheath assembly 200 (e.g., outer sheath 220).

[0190] In some examples, the second seal 620 may include, but is not limited to, a sealing ring, heat shrink film, etc. The structure of the second seal 620 is not limited here, as long as it serves a sealing function.

[0191] Reference Figure 8 As shown, in some examples, in order to insulate the blade 400 from the outer sheath assembly 200, the electric cutter may also include an insulating sleeve 700, which is disposed on the inner side of the distal end of the outer sheath assembly 200, and the blade 400 is movably inserted through the insulating sleeve 700.

[0192] Taking the outer sheath assembly 200, which includes the outer sheath 220, as an example, the insulating sleeve 700 is disposed on the inner side of the distal end of the outer sheath 220 and is fixed relative to the outer sheath 220. For example, a protrusion 2111 can be provided on one of the outer side wall of the insulating sleeve 700 and the inner side wall of the outer sheath 220, and a groove matching the protrusion 2111 can be provided on the other of the outer side wall of the insulating sleeve 700 and the inner side wall of the outer sheath 220. The protrusion 2111 is embedded in the groove to limit the insulating sleeve 700 in the axial direction of the outer sheath 220, and can also increase the sealing between the insulating sleeve 700 and the outer sheath 220.

[0193] For example, a protrusion 2111 may be provided on the outer side wall of the insulating sleeve 700, and a groove matching the protrusion 2111 may be provided on the other side wall of the outer sheath 220, with the protrusion 2111 embedded in the groove.

[0194] In some examples, in order to enable the cutting head 400 to move relative to the insulating sleeve 700, there is an assembly gap between the cutting head 400 and the inner wall of the insulating sleeve 700.

[0195] In some examples, the second seal 620 is located on the side of the insulating sleeve 700 facing the conductive assembly 500. This seal isolates the injection channel 530a from the insulating sleeve 700 axially along the electric cutting blade, reducing or preventing liquid in the injection channel 530a from flowing out of the distal end of the electric cutting blade through the assembly gap between the inner wall of the insulating sleeve 700 and the blade head 400, thereby improving the injection effect. Furthermore, the second seal 620 can also reduce or prevent liquid in the injection channel 530a from flowing out of the distal end of the electric cutting blade through the gap between the outer wall of the insulating sleeve 700 and the outer sheath 220.

[0196] In some examples, the outer wall of the second seal 620 is connected to the outer sheath assembly 200, and the blade 400 and the conductive component 500 are movable relative to the second seal 620. Thus, the second seal 620 can be pre-assembled onto the outer sheath assembly 200, and the blade 400 can be inserted through the second seal 620, making the assembly of the entire electric cutter simpler and faster.

[0197] Furthermore, once the position of the second seal 620 on the outer sheath assembly 200 is determined, the cutter head 400 can maintain close contact with the second seal 620 throughout its axial movement along the outer sheath assembly 200. This ensures that the outer wall of the second seal 620 is in sealed contact with the inner wall of the outer sheath assembly 200, and also ensures that the inner wall of the second seal 620 is in sealed contact with the outer wall of the cutter head 400. This prevents liquid from flowing out along the outer wall of the cutter head 400 or the outer wall of the insulating sleeve 700.

[0198] In some examples, the second seal 620 may be directly bonded or snapped onto the inner wall of the outer sheath assembly 200, such as the outer sheath 220.

[0199] In some examples, the electric cutter may also include a mounting base 800, which is sealed to the distal inner wall of the outer sheath assembly 200 and located on the side of the insulating sleeve 700 facing the second conductive member 520. The cutter head 400 is movably inserted through the mounting base 800, and a mounting cavity 810 is formed on the mounting base 800. The second sealing member 620 is sleeved on the cutter head 400 and located within the mounting cavity 810.

[0200] In some examples, the outer wall of the mounting base 800 can be sealed to the inner wall of the outer sheath assembly 200 by means of adhesive or snap-fit, the second seal 620 is accommodated in the mounting cavity 810 of the mounting base 800, a through channel is formed in the middle of the mounting base 800, the cutter head 400 is movably inserted through the second seal 620 and exits the mounting base 800 through the through channel.

[0201] The mounting base 800 allows for a better seal between the outer wall of the second seal 620 and the outer sheath assembly 200. For example, by flexibly designing the structure of the mounting base 800, the cavity wall of the mounting cavity 810 in the mounting base 800 can fit well against the outer wall of the second seal 620, ensuring the seal between the second seal 620 and the mounting base 800, and thus ensuring the seal between the second seal 620 and the outer sheath assembly 200. During assembly, the second seal 620 can be first installed in the mounting base 800, then the mounting base 800 can be installed on the inner wall of the outer sheath assembly 200, and then the cutting head 400 can be passed through the mounting base 800 and the second seal 620.

[0202] In some examples, the distal inner diameter of the outer sheath assembly 200, such as the outer sheath 220, is larger than the inner diameter of other parts, such that a stepped surface is formed on the inner sidewall of the distal end of the outer sheath 220, and the mounting seat 800 can abut against this stepped surface to provide axial positioning for the mounting seat 800.

[0203] Continue to refer to Figure 8 As shown, in some examples, the mounting base 800 is similar to a bowl-shaped structure. For example, the mounting base 800 also includes an opening 820 and an end wall 830 opposite to the opening 820. The opening 820 communicates with the mounting cavity 810 and faces the insulating sleeve 700.

[0204] One end face of the second seal 620 abuts against the insulating sleeve 700 through the opening 820, and the other end face of the second seal 620 abuts against the side of the end wall 830 facing the mounting cavity 810.

[0205] For example, a portion of the mounting base 800 near the opening 820 may be fitted onto the insulating sleeve 700 to enhance the assembly stability between the mounting base 800 and the insulating sleeve 700, thereby ensuring the stability of the mounting base 800 within the outer sheath assembly 200.

[0206] One end face of the second seal 620 abuts against the end face of the insulating sleeve 700, and the other end face of the second seal 620 abuts against the inner side of the end wall 830 of the mounting base 800 (the side of the end wall 830 facing the mounting cavity 810). The remaining outer side wall of the second seal 620 can abut against other inner walls of the mounting base 800, thereby enhancing the sealing performance of the outer wall of the second seal 620 around the perimeter and preventing liquid in the injection channel 530a from flowing into the side wall of the cutter head 400 or the outer wall of the insulating sleeve 700 through the outer wall of the second seal 620, and then flowing out of the distal end of the electric cutter.

[0207] In some examples, the side of the end wall 830 facing away from the mounting cavity 810 is configured to contact the second conductive element 520 at least when the tip 400 is injecting liquid.

[0208] For example, after the distal end of the cutting head 400 is assembled with the second conductive element 520, the outer diameter of the second conductive element 520 is larger than the outer diameter of the cutting head 400, so that the distal end of the second conductive element 520 is exposed outside the cutting head 400. For example, the distal end of the second conductive element 520 may have an assembly cavity, and the distal end of the cutting head 400 may at least partially extend into the assembly cavity, that is, the distal end of the second conductive element 520 is sleeved on the distal end of the cutting head 400 to increase the connection stability between the second conductive element 520 and the cutting head 400. The distal sidewall of the cutting head 400 may be connected to the inner wall of the assembly cavity of the second conductive element 520 by means of bonding or other methods.

[0209] When the cutter head 400 needs to cut, the second handle 300 drives the conductive component 500 and the cutter head 400 to extend to the distal end of the outer sheath assembly 200, so that the distal end of the second conductive component 520 abuts against the outer side of the end wall 830 of the mounting base 800, thereby improving the sealing between the second conductive component 520 and the mounting base 800. This reduces or avoids the risk that liquid will enter the gap between the mounting base 800 and the cutter head 400 through the second conductive component 520 and the mounting base 800 during the liquid injection process.

[0210] In addition, after the cutter head 400 is extended and retracted to its final position, it may rotate in some cases. By abutting the end of the second conductive element 520 against the end wall 830 of the mounting base 800, compared to directly abutting against the second sealing element 620, such as the sealing ring, the rotational friction can be reduced, thereby making the rotation of the cutter head 400 smoother. It also ensures that the second conductive element 520 will not affect the stability of the second sealing element 620 during rotation. This ensures that after the second conductive element 520 drives the cutter head 400 to rotate to its final position, the sealing effect of the second sealing element 620 on the distal end of the injection channel 530a is not affected.

[0211] Continue to refer to Figure 8 As shown, in some examples, the electric cutter may also include a metal part 900 disposed on the cutter head 400, with a second seal 620 and an insulating sleeve 700 movably sleeved on the metal part 900.

[0212] In practice, the outer surface roughness of the cutter head 400 is relatively high during injection molding, which affects the tightness of the contact between the second seal 620 and the cutter head 400. Therefore, by providing a metal part 900 on the outside of the cutter head 400, the surface of the metal part 900 is relatively smooth, which can ensure the sealing performance between the second seal 620 and the cutter head 400.

[0213] In some examples, the metal part 900 can be injection molded integrally with the cutter head 400.

[0214] In some examples, the metal part 900 can also be fitted onto the outer wall of the cutter head 400 after the cutter head 400 is formed.

[0215] In some examples, the material of the metal part 900 may include, but is not limited to, iron, copper, stainless steel, titanium alloy, copper alloy, etc., as long as the smoothness of the surface of the metal part 900 is ensured so that the metal part 900 fits tightly with the second sealing element 620.

[0216] In some examples, the extension length of the metal part 900 can be equal to or less than the extension length of the cutter head 400. There is no limitation on the extension length of the metal part 900, as long as the second seal 620 is always in contact with the metal part 900 during the extension and retraction of the cutter head 400.

[0217] Reference Figure 9 and Figure 11 As shown, in some examples, the second seal 620 is fixedly disposed on the outer wall of the second conductive element 520 or at the end of the second conductive element 520 facing the insulating sleeve 700, so as to move with the cutter head 400 and the conductive assembly 500. In this way, the second seal 620 can be disposed at the corresponding position of the second conductive element 520 according to the actual sealing requirements to ensure the sealing performance of the corresponding position of the second conductive element 520.

[0218] For example, the second seal 620 is fixed at the position of the outer wall or end of the second conductive member 520. During the extension and retraction of the cutter head 400 and the conductive assembly 500 in the axial direction of the electric cutter, the second seal 620 can always seal the outer wall or end of the second conductive member 520, thereby ensuring the sealing performance of the second seal 620 at the required sealing position of the second conductive member 520.

[0219] For example, the second seal 620 is fitted onto the outer wall of the second conductive member 520 to seal the gap between the second conductive member 520 and the outer sheath assembly 200, thereby reducing or preventing the risk of liquid in the injection channel 530a flowing into the outer wall of the insulating sleeve 700 or the outer wall of the cutter head 400 through the outer wall of the second conductive member 520.

[0220] For example, the second seal 620 can be disposed at the end of the second conductive element 520 facing the insulating sleeve 700, so that when the cutter head 400 is in the liquid injection state, the second conductive element 520 abuts against the end face of the insulating sleeve 700 through the second seal 620 to seal the gap between the second conductive element 520 and the insulating sleeve 700, thereby reducing or avoiding the risk of liquid in the liquid injection channel 530a flowing into the outer wall of the cutter head 400 through the gap between the second conductive element 520 and the insulating sleeve 700.

[0221] Reference Figure 11 As shown, in some examples, the second seal 620 can be a heat-shrink film. Exemplarily, a recess 522 is formed on the outer wall of the second conductive element 520, the second seal 620 is attached to the outer wall of the second conductive element 520, and at least a portion of the second seal 620 is located on the inner wall of the recess 522. This increases the contact area between the second seal 620 and the second conductive element 520, thereby increasing the tightness of the fit between the second seal 620 and the second conductive element 520.

[0222] In some examples, multiple spaced recesses 522 may be provided along the axial direction of the second conductive element 520 to further increase the contact area between the second seal 620 and the second conductive element 520.

[0223] In some examples, the distal end of the second seal 620 may extend to the distal end wall 830 of the second conductor 520 so that when the cutter head 400 is in the liquid injection state, the second conductor 520 and the insulating sleeve 700 can abut against each other through the second seal 620 when the second conductor 520 abuts against the proximal end wall 830 of the insulating sleeve 700. This improves the sealing performance between the second conductor 520 and the insulating sleeve 700, thereby reducing or avoiding the risk of liquid in the liquid injection channel 530a entering the outer wall of the cutter head 400 through the gap between the second conductor 520 and the insulating sleeve 700.

[0224] In some examples, the proximal end of the second seal 620 may extend to the edge of the inlet 520b of the second conductor 520 to seal the gap at the outer wall of the second conductor 520 to a greater extent.

[0225] In some examples, when the second seal 620 is disposed at the end of the second conductive member 520 toward the insulating sleeve 700, the second seal 620 may be connected, for example, bonded to the end wall 830 of the second conductive member 520 to seal the gap between the second conductive member 520 and the insulating sleeve 700.

[0226] Reference Figure 9 As shown, in some examples, a portion of the second conductive element 520 may be sleeved on the distal end of the second conductive element 520, and another portion may extend out of the second conductive element 520 to abut against the end face of the insulating sleeve 700.

[0227] Reference Figure 9 and Figure 10 As shown, by way of example, an annular groove 521 may be formed at one end of the second conductive member 520 facing the insulating sleeve 700, a part of the second sealing member 620 is sleeved on the annular groove 521, and another part of the second sealing member 620 is sleeved on the cutting head 400, so that when the cutting head 400 is in the liquid injection state, the second sealing member 620 abuts against the end face of the insulating sleeve 700.

[0228] On the one hand, a portion of the second seal 620 is fitted onto the annular groove 521. The groove end wall 830 of the annular groove 521 (facing the insulating sleeve 700) can limit the second seal 620, ensuring the stability of the second seal 620 in the axial direction of the second conductive element 520. On the other hand, the second seal 620 is fitted onto the annular groove 521 to increase the contact area between the second seal 620 and the second conductive element 520, thereby increasing the tightness of the contact between the second seal 620 and the second conductive element 520. This ensures that the liquid in the injection channel 530a will not enter the distal end of the second conductive element 520 through the gap between the second seal 620 and the second conductive element 520, and thus ensures that the liquid will not flow into the side wall of the cutter head 400.

[0229] Reference Figure 12 As shown, in practice, the liquid in the injection channel 530a may flow back through the outer wall of the first conductive element 510 to the second injection chamber 310 of the second handle 300 and then out of the injection port 310a, causing contamination to the operator. In addition, the liquid injected through the injection port 310a may flow into the side wall of the first conductive element 510 and then to the power connector 213, causing contamination to the power connector 213.

[0230] Figure 12 yes Figure 6 A magnified view of a section at point C. (Refer to...) Figure 12 As shown, in some examples, the electric cutter may also include a second sealing structure 1100.

[0231] The second sealing structure 1100 is disposed between the outer wall of the conductive component 500 (e.g., the first conductive element 510) and the inner wall of the second handle 300 (i.e., the cavity wall of the second injection chamber 310) to seal the gap between the conductive component 500 (e.g., the first conductive element 510) and the inner wall of the second handle 300. In this way, the risk of liquid in the second injection chamber 310 flowing into the gap between the first conductive element 510 and the inner wall of the second handle 300, for example, flowing to the power connector 213 and causing contamination of the power connector 213, can be reduced or avoided. It can also reduce or avoid the risk of liquid in the injection channel 530a flowing back into the injection port 310a through the gap between the first conductive element 510 and the inner wall of the second handle 300 and causing contamination to the operator.

[0232] In some examples, the second sealing structure 1100 may include, but is not limited to, a sealing ring.

[0233] In some examples, a fixing seat 320 can be provided at the distal end of the second injection chamber 310, and the proximal end of the first conductive element 510 is fixedly inserted into the fixing seat 320. The second sealing structure 1100 is sleeved on the fixing seat 320 and is in close contact with the inner cavity of the second injection chamber 310 to ensure the sealing between the first conductive element 510 and the second injection chamber 310.

[0234] In addition, the first conductive element 510 is mounted on the fixed base 320. In this way, when the first conductive element 510 rotates around the axis of the electric cutter, it can drive the fixed base 320 to rotate relative to the second handle 300, which can ensure the stability of the cooperation between the first conductive element 510 and the second handle 300 during the rotation.

[0235] In some examples, the second sealing structure 1100 may be fixedly mounted on the fixing seat 320 so as to rotate with the fixing seat 320.

[0236] In some examples, the second sealing structure 1100 can be connected to the cavity wall of the second injection chamber 310, so that the second sealing structure 1100 remains stationary when the fixed seat 320 rotates. Figure 13 This is a schematic diagram of the structure of one type of cutter head provided in an embodiment of this application. Figure 14 This is a schematic diagram of another cutter head provided in one embodiment of this application. Figure 15 This is a schematic diagram of the structure of another cutter head provided in an embodiment of this application. (Refer to...) Figures 13 to 15 As shown,

[0237] Reference Figure 13As shown, in some examples, the main body 410 and the bending part 420 can be integrally molded as a single piece. In other words, the cutter head 400 is integrally injection molded to simplify the assembly process of the cutter head 400 and also improve the structural strength of the cutter head 400.

[0238] Reference Figure 14 and Figure 15 As shown, in some examples, the cutter head 400 is a separate component consisting of multiple parts connected together.

[0239] In some examples, the main body 410 and the bent part 420 can be separate parts that are connected together. For example, the main body 410 and the bent part 420 can be made separately first, and then the main body 410 and the bent part 420 can be connected together.

[0240] In some examples, the main body 410 can be configured as two parts, one part (e.g., the first part 413) is injection molded, and the other part (the second part 414) is integrally injection molded with the bent part 420.

[0241] The second part 414 may be a sleeve formed at one end of the bent part 420. The sleeve has an inner cavity, and the distal end of the first part 413 may pass through the inner cavity of the sleeve to connect with the bent part 420. One end of the sleeve has a liquid outlet 400b communicating with the inner cavity and communicating with the opening at the distal end of the first part 413 to output liquid.

[0242] In some examples, the second part 414 may be welded to the first part 413 to simplify the structure of the second part 414 and facilitate the connection between the first part 413 and the second part 414.

[0243] This application embodiment does not limit the connection method between the main body 410 and the bent part 420.

[0244] Reference Figure 13 As shown, in some examples, the main body 410 includes a first main body 411 and a second main body 412 connected sequentially from the proximal end to the distal end. The first main body 411 is connected to the conductive component 500, and the second main body 412 is connected to the bending portion 420. The outer diameter of the first main body 411 is larger than the outer diameter of the second main body 412. A first sealing structure 600 is provided on the first main body 411. In this way, the size of the cutter head 400 and the first sealing structure 600 can be better matched, ensuring the sealing between the cutter head 400 and the first sealing structure 600.

[0245] In addition, the outer diameter of the second body 412 is smaller than that of the first body 411, which can save material for the cutter head 400, reduce costs, and reduce the weight of the cutter head 400, which is beneficial to the movement and rotation of the cutter head 400.

[0246] It is readily understood that, based on the several embodiments provided in this application, those skilled in the art can combine, split, or reorganize the embodiments of this application to obtain other embodiments, none of which exceed the protection scope of this application.

[0247] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. An electric cutting knife, characterized in that, include: First handle (100); An outer sheath assembly (200) is connected to the first handle (100); The second handle (300) is disposed on the first handle (100) and can move along the axial direction of the first handle (100). The second handle (300) is provided with an injection port (310a). The cutting head (400) is connected to the second handle (300) via a conductive component (500) so as to extend or retract the outer sheath assembly (200) under the action of the second handle (300). A first injection chamber (400a) is formed inside the cutting head (400) penetrating the distal end of the cutting head (400). The outer sheath assembly (200) is at least partially sleeved on the conductive component (500) and forms an injection channel (530a) between it and at least a portion of the conductive component (500). The proximal end of the injection channel (530a) communicates with the injection port (310a), and the distal end of the injection channel (530a) communicates with the first injection chamber (400a). A first sealing structure (600) is disposed between the proximal side and the distal side of the injection channel (530a) so that liquid injected from the injection port (310a) flows sequentially into the injection channel (530a) and the first injection chamber (400a).

2. The electric cutting blade according to claim 1, characterized in that, The conductive component (500) includes a first conductive element (510), a conductive element (530), and a second conductive element (520) connected sequentially from the proximal end to the distal end; The proximal end of the first conductive element (510) is connected to the injection port (310a), and the distal end of the second conductive element (520) is electrically connected to the blade (400) and is connected to the first injection chamber (400a). The outer sheath assembly (200) is at least sleeved on the conductive element (530), the first conductive element (510) and the second conductive element (520), and forms the injection channel (530a) at least partially between the outer sheath assembly and the conductive element (530). The proximal end of the injection channel (530a) is connected to the first conductive element (510), and the distal end of the injection channel (530a) is connected to the second conductive element (520).

3. The electric cutting blade according to claim 1, characterized in that, The distal end of the outer sheath assembly (200) extends to the blade head (400), and the first sealing structure (600) is disposed inside the outer sheath assembly (200) and located at at least one of the blade head (400) and the second handle (300).

4. The electric cutting blade according to claim 2, characterized in that, The first sealing structure (600) includes a first sealing element (610); The first seal (610) is disposed between the first conductive element (510) and the outer sheath assembly (200), and is located on the side of the second handle (300) facing the blade (400).

5. The electric cutting blade according to claim 4, characterized in that, The proximal outer wall of the first seal (610) is attached to the inner wall of the outer sheath assembly (200), and there is a gap between the distal outer wall of the first seal (610) and the outer sheath assembly (200) so that liquid can enter the outer wall of the first seal (610) through the gap. The first seal (610) is configured to retract toward the first conductive element (510) under the action of liquid pressure.

6. The electric cutting blade according to claim 4, characterized in that, The outer sheath assembly (200) includes: The protective tube (210) is connected to the first handle (100) at its proximal end via a connector (211); the power connector (213) of the electric cutter is inserted into the connector (211); An outer sheath tube (220) is disposed inside the protective tube (210), and the distal end of the outer sheath tube (220) extends beyond the distal end of the protective tube (210). The blade (400) can extend or retract into the outer sheath tube (220).

7. The electric cutting blade according to claim 6, characterized in that, The connector seat (211) extends into the inner side of the protective tube (210) and has a connecting part (211a), and the proximal end of the outer sheath tube (220) is sleeved on the connecting part (211a); The first portion (611) of the first seal (610) is located between the outer sheath (220) and the first conductive element (510), and the second portion (612) of the first seal (610) extends between the outer sheath (220) and the connecting portion (211a).

8. The electric cutting blade according to claim 7, characterized in that, A protrusion (2111) is formed on one of the outer sidewall of the connecting part (211a) and the inner sidewall of the outer sheath (220), and a groove matching the protrusion (2111) is formed on the other of the outer sidewall of the connecting part (211a) and the inner sidewall of the outer sheath (220), and the protrusion (2111) is embedded in the groove.

9. The electric cutting blade according to claim 2, characterized in that, The first sealing structure (600) includes a second sealing element (620); The second seal (620) is disposed between at least one of the second conductive element (520) and the blade (400) and the outer sheath assembly (200); The distal end of the injection channel (530a) is connected through the inlet (520b) provided on the second conductive element (520), and the second sealing element (620) is located on the side of the inlet (520b) facing the cutter head (400).

10. The electric cutting blade according to claim 9, characterized in that, It also includes an insulating sleeve (700), which is disposed on the inner side of the distal end of the outer sheath assembly (200), and the cutting head (400) is movably inserted through the insulating sleeve (700); The second seal (620) is located on the side of the insulating sleeve (700) facing the conductive component (500).

11. The electric cutting blade according to claim 10, characterized in that, The outer wall of the second seal (620) is connected to the outer sheath assembly (200), and the blade (400) and the conductive assembly (500) are movable relative to the second seal (620).

12. The electric cutting blade according to claim 11, characterized in that, It also includes a mounting base (800), which is sealed to the inner wall of the distal end of the outer sheath assembly (200) and located on the side of the insulating sleeve (700) facing the second conductive element (520), and the blade (400) is movably inserted through the mounting base (800); The mounting base (800) has a mounting cavity (810) formed thereon, and the second sealing member (620) is sleeved on the cutting head (400) and located inside the mounting cavity (810).

13. The electric cutting blade according to claim 12, characterized in that, The mounting base (800) further includes an opening (820) and an end wall (830) opposite to the opening (820), the opening (820) communicating with the mounting cavity (810) and facing the insulating sleeve (700); One end face of the second seal (620) abuts against the insulating sleeve (700) through the opening (820), and the other end face of the second seal (620) abuts against the side of the end wall (830) facing the mounting cavity (810). The side of the end wall (830) facing away from the mounting cavity (810) is configured to contact the second conductive element (520) at least when the blade (400) is injected with liquid.

14. The electric cutting blade according to claim 11, characterized in that, It also includes a metal part (900) disposed on the cutter head (400), and the second sealing member (620) and the insulating sleeve (700) are movably sleeved on the metal part (900).

15. The electric cutting blade according to claim 10, characterized in that, The second seal (620) is fixedly disposed on the outer side wall of the second conductive element (520) or at the end of the second conductive element (520) facing the insulating sleeve (700) so as to move with the cutter head (400) and the conductive assembly (500).

16. The electric cutting blade according to claim 15, characterized in that, A recess (522) is formed on the outer side wall of the second conductive element (520), the second sealing element (620) is attached to the outer side wall of the second conductive element (520), and at least a portion of the second sealing element (620) is located on the inner wall of the recess (522).

17. The electric cutting blade according to claim 15, characterized in that, The second conductive element (520) has an annular groove (521) formed at one end facing the insulating sleeve (700). A portion of the second sealing element (620) is fitted onto the annular groove (521), and another portion of the second sealing element (620) is fitted onto the cutting head (400) so that when the cutting head (400) is in the liquid injection state, the second sealing element (620) abuts against the end face of the insulating sleeve (700).

18. The electric cutting blade according to claim 1, characterized in that, It also includes a second sealing structure (1100); The second handle (300) has a second injection chamber (310) that communicates with the injection port (310a), and the proximal end of the conductive component (500) extends into the second handle (300) and communicates with the second injection chamber (310); The second sealing structure (1100) is disposed between the outer wall of the conductive component (500) and the cavity wall of the second injection chamber (310).

19. The electric cutting blade according to any one of claims 1-18, characterized in that, The cutting head (400) includes a main body (410) and a bending part (420); The main body (410) is movably inserted into the outer sheath assembly (200), and the proximal end of the main body (410) is connected to the conductive assembly (500). The bent portion (420) is located at the distal end of the main body (410) and has an angle with the main body (410). The first injection chamber (400a) is located inside the main body (410) and extends through the distal end of the main body (410).

20. The electric cutting blade according to claim 19, characterized in that, The main body (410) and the bent part (420) are integrally formed as a single piece; or, The cutter head (400) is a separate component consisting of multiple parts connected together.

21. The electric cutting blade according to claim 19, characterized in that, The main body (410) includes a first body (411) and a second body (412) connected sequentially from the proximal end to the distal end. The first body (411) is connected to the conductive component (500), and the second body (412) is connected to the bending portion (420). The outer diameter of the first body (411) is larger than the outer diameter of the second body (412), and the first body (411) is used to provide the first sealing structure (600).

22. The electric cutting blade according to any one of claims 1-18, characterized in that, It also includes rotating the knob (1000); The proximal end of the outer sheath assembly (200) is connected to the first handle (100) via the rotary knob (1000). The rotary knob (1000) is fixed relative to the outer sheath assembly (200) and the first handle (100) in the axial direction of the first handle (100). The rotary knob (1000) is rotatable relative to the outer sheath assembly (200) and the first handle (100) about the axis of the first handle (100). The conductive component (500) is movably disposed through the rotary knob (1000), which is configured to drive the conductive component (500) and the blade (400) to rotate around the axis of the first handle (100). The first sealing structure (600) is configured to seal the proximal side and the distal side of the injection channel (530a) after the blade (400) has been rotated into position.

Images