Electric knife

Abstract

The invention 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 technical field of medical devices, and particularly relates to an electric cutting knife. Background Art

[0002] In recent years, with the development of endoscopic technology, endoscopic tissue biopsy, endoscopic mucosal resection, and endoscopic submucosal dissection have been widely applied, which play a key role in the discovery, diagnosis, and treatment of gastrointestinal bleeding, stenosis, polyp resection, and early gastrointestinal cancer.

[0003] When performing an ESD operation under endoscopic guidance, the endoscope first enters the human body to find the lesion location, and an electrocautery knife instrument is inserted through the endoscopic working channel to mark the periphery of the lesion site. Then, the electrocautery knife is withdrawn, and an injection needle is inserted into the human body lesion site through the endoscopic working channel for submucosal injection to elevate the mucosal tissue to be incised. After injection, the injection needle is withdrawn again, and a suitable electrocautery knife is inserted for mucosal incision. Thus, frequently changing surgical instruments during the operation will make the operation cumbersome and complex, prolong the operation time, and increase the patient's pain. Summary of the Invention

[0004] The embodiments of this application provide an electric cutting knife that integrates the functions of liquid injection and cutting, can reduce the number of times of changing surgical instruments, shorten the operation time, and also play a role in sealing the liquid injected into the liquid injection channel, reducing the risk of liquid flowing out from other positions.

[0005] The embodiments of this application provide an electric cutting knife, including:

[0006] A first handle;

[0007] An outer sheath tube assembly connected to the first handle;

[0008] A second handle disposed on the first handle and movable along the axial direction of the first handle, and a liquid injection port is provided on the second handle;

[0009] A knife head connected to the second handle through a conductive component to extend or retract from the outer sheath tube assembly under the drive of the second handle. A first liquid injection cavity penetrating the distal end of the knife head is formed in the knife head. At least part of the outer sheath tube assembly is sleeved on the conductive component, and a liquid injection channel is formed between at least part of the outer sheath tube assembly and the conductive component. The proximal end of the liquid injection channel is communicated with the liquid injection port, and the distal end of the liquid injection channel is communicated with the first liquid injection cavity;

[0010] A first sealing structure is disposed between the proximal side and the distal side of the liquid injection channel to enable the liquid injected from the liquid injection port to flow into the liquid injection channel and the first liquid injection cavity in sequence.

[0011] In some implementation manners, the conductive component includes a first conductive member, a conductive element, and a second conductive member connected in sequence from the proximal end to the distal end;

[0012] The proximal end of the first conductive member communicates with the liquid injection port, and the distal end of the second conductive member is electrically connected to the cutter head and communicates with the first liquid injection cavity;

[0013] The outer sheath tube assembly is at least sleeved on the conductive element, the first conductive member and the second conductive member, and a liquid injection channel is formed between the outer sheath tube assembly and at least a part of the conductive element. The proximal end of the liquid injection channel communicates with the first conductive member, and the distal end of the liquid injection channel communicates with the second conductive member.

[0014] In some implementation manners, the distal end of the outer sheath tube assembly extends to the cutter head, and the first sealing structure is arranged on the inner side of the outer sheath tube assembly and is located at least at one of the cutter head, between the cutter head and the second handle.

[0015] In some implementation manners, the first sealing structure includes a first sealing member;

[0016] The first sealing member is arranged between the first conductive member and the outer sheath tube assembly and is located on the side of the second handle facing the cutter head.

[0017] In some implementation manners, the outer side wall of the proximal end of the first sealing member is attached to the inner wall of the outer sheath tube assembly, and there is a gap between the outer side wall of the distal end of the first sealing member and the outer sheath tube assembly, so that the liquid enters the outer side wall of the first sealing member through the gap;

[0018] The first sealing member is configured to contract towards the first conductive member under the action of liquid pressure.

[0019] In some implementation manners, the outer sheath tube assembly includes:

[0020] A protection tube, the proximal end of which is connected to the first handle through a joint seat; a power connector is inserted into the joint seat;

[0021] An outer sheath tube, which is arranged inside the protection tube, and the distal end of the outer sheath tube extends out of the distal end of the protection tube, and the cutter head can extend or retract into the outer sheath tube.

[0022] In some implementation manners, the joint seat extends a connecting portion towards the inner side of the protection tube, and the proximal end of the outer sheath tube is sleeved on the connecting portion;

[0023] The first part of the first sealing member is located between the outer sheath tube and the first conductive member, and the second part of the first sealing member extends between the outer sheath tube and the connecting portion.

[0024] In some implementation manners, a protrusion is formed on one of the outer side wall of the connecting portion and the inner side wall of the outer sheath tube, and a groove matching the protrusion is formed on the other of the outer side wall of the connecting portion and the inner side wall of the outer sheath tube, and the protrusion is embedded in the groove.

[0025] In some implementation manners, the first sealing structure includes a second sealing member;

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

[0027] The distal end of the liquid injection channel communicates with the liquid inlet formed on the second conductive member, and the second seal is located on the side of the liquid inlet facing the cutter head.

[0028] In some implementations, an insulating sleeve is further included. The insulating sleeve is disposed inside the distal end of the outer sheath tube assembly, and the cutter head movably penetrates through the insulating sleeve;

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

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

[0031] In some implementations, a mounting seat is further included. The mounting seat is hermetically disposed on the inner side wall of the distal end of the outer sheath tube assembly and is located on the side of the insulating sleeve facing the second conductive member. The cutter head movably penetrates through the mounting seat;

[0032] A mounting cavity is formed on the mounting seat. The second seal is sleeved on the cutter head and is located inside the mounting cavity.

[0033] In some implementations, the mounting seat further includes an opening and an end wall opposite to the opening. The opening communicates with the mounting cavity and faces the insulating sleeve;

[0034] One end face of the second seal abuts against the insulating sleeve through the 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 member at least when the cutter head is being injected with liquid.

[0035] In some implementations, a metal part is further included. The metal part is disposed on the cutter head, and the second seal and the insulating sleeve are movably sleeved on the metal part.

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

[0037] In some implementations, a recess is formed on the outer side wall of the second conductive member. The second seal adheres to the outer side wall of the second conductive member, and at least a part 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 member facing the insulating sleeve. A part of the second seal is sleeved on the annular groove, and another part of the second seal is sleeved on the tool tip. When the tool tip is in the liquid injection state, the second seal abuts against the end face of the insulating sleeve.

[0039] In some implementations, it further includes a second sealing structure;

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

[0041] The second sealing structure is arranged between the outer side wall of the conductive component and the cavity wall of the second liquid injection cavity.

[0042] In some implementations, the tool tip includes a main body portion and a bent portion;

[0043] The main body portion movably passes through the outer sheath tube assembly, and the proximal end of the main body portion is connected to the conductive component. The bent portion is located at the distal end of the main body portion and has an included angle with the main body portion;

[0044] The first liquid injection cavity is located in the main body portion and penetrates through the distal end of the main body portion.

[0045] In some implementations, the main body portion and the bent portion are an integrally formed one-piece; or,

[0046] The tool tip is a split piece including multiple components connected together.

[0047] In some implementations, the main body portion includes a first main body and a second main body connected in sequence from the proximal end to the distal end. The first main body is connected to the conductive component, and the second main body is connected to the bent portion;

[0048] The outer diameter dimension of the first main body is larger than that of the second main body, and the first sealing structure is arranged on the first main body.

[0049] In some implementations, it further includes a rotation knob;

[0050] The proximal end of the outer sheath tube assembly is connected to the first handle through the rotation knob. The rotation knob is relatively fixed axially on the first handle with respect to the outer sheath tube assembly and the first handle, and the rotation knob can rotate around the axis of the first handle with respect to the outer sheath tube assembly and the first handle;

[0051] The conductive component is movably disposed through the rotary knob, and the rotary knob is configured to drive the conductive component and the cutter head to rotate around the axis of the first handle. The first sealing structure is configured to seal the proximal side and the distal side of the liquid injection channel after the cutter head rotates into place. An electrocision knife provided by an embodiment of the present application has a liquid injection channel formed between the outer sheath tube assembly sleeved on the conductive component and at least a part of the conductive component. The proximal end of the liquid injection channel communicates with the liquid injection port on the second handle, and the distal end of the liquid injection channel communicates with the first liquid injection cavity of the cutter head. Thus, when liquid injection is required, for example, when injecting liquid into the submucosa, the liquid can enter the electrocision knife through the liquid injection port on the second handle, flow out of the cutter head through the liquid injection channel and the first liquid injection cavity, and be injected into the submucosa to achieve mucosal dissection. After liquid injection, there is no need to replace the instrument, and the target tissue can continue to be cut through the cutter head of the electrocision knife, which can reduce the number of times of replacing surgical instruments, shorten the operation time, and also reduce the secondary injury to the patient.

[0052] In addition, by providing a first sealing structure between the proximal side and the distal side of the liquid injection channel, the liquid injected into the electrocision knife from the liquid injection port can flow into the liquid injection channel and the first liquid injection cavity in sequence, reducing or avoiding the risk of liquid leakage from the proximal side and / or the distal side of the liquid injection channel, alleviating or avoiding the contamination of structural components such as the power connector on the proximal side of the liquid injection channel by the liquid, and / or alleviating or avoiding the situation that the liquid flows out from the side wall of the cutter head on the distal side of the liquid injection channel, thereby affecting the liquid injection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0054] Figure 1 is a schematic structural diagram of an electrocision knife provided by an embodiment of the present application;

[0055] Figure 2 is a cross-sectional view of an electrocision knife provided by an embodiment of the present application;

[0056] Figure 3 is Figure 1 a partial enlarged view of part A in

[0057] Figure 4 is a partial cross-sectional view of an electrocision knife provided by an embodiment of the present application Figure 1 ;

[0058] Figure 5 is a partial cross-sectional view of an electrocision knife provided by an embodiment of the present application Figure 2 ;

[0059] Figure 6 is a partial cross-sectional view of an electric cutting knife provided by an embodiment of the present application Figure 3 ;

[0060] Figure 7 is Figure 5 a partial enlarged view at B;

[0061] Figure 8 is a partial cross-sectional view of one of the electric cutting knives provided by an embodiment of the present application at the distal end of the outer sheath tube assembly;

[0062] Figure 9 is a partial cross-sectional view of another electric cutting knife provided by an embodiment of the present application at the distal end of the outer sheath tube assembly;

[0063] Figure 10 is a schematic structural view of a second conductive member provided by an embodiment of the present application;

[0064] Figure 11 is a partial cross-sectional view of yet another electric cutting knife provided by an embodiment of the present application at the distal end of the outer sheath tube assembly;

[0065] Figure 12 is Figure 6 a partial enlarged view at C in;

[0066] Figure 13 is a schematic structural view of one of the cutter heads provided by an embodiment of the present application;

[0067] Figure 14 is a schematic structural view of another cutter head provided by an embodiment of the present application;

[0068] Figure 15 is a schematic structural view of yet another cutter head provided by an embodiment of the present application.

[0069] Explanation of reference numerals:

[0070] 100 - First handle;

[0071] 200 - Outer sheath tube assembly; 210 - Protection tube; 211 - Connector seat; 211a - Connection part; 2111 - Projection; 213 - Power connector; 220 - Outer sheath tube;

[0072] 300 - Second handle; 310 - Second liquid injection cavity; 310a - Liquid injection port; 320 - Fixed seat;

[0073] 400 - Cutter head; 400a - First liquid injection cavity; 400b - Liquid outlet; 410 - Main body part; 411 - First main body; 412 - Second main body; 413 - First part; 414 - Second part; 420 - Bending part;

[0074] 500 - Conductive component; 510 - First conductive member; 510a - First lumen; 510b - Intermediate liquid outlet; 520 - Second conductive member; 521 - Annular groove; 522 - Depressed position; 520a - Second lumen; 520b - Liquid inlet; 530 - Conductive element; 530a - Liquid injection channel; 540 - Fitting portion;

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

[0076] 700 - Insulating sleeve;

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

[0078] 900 - Metal part;

[0079] 1000 - Rotating knob;

[0080] 1100 - Second sealing structure. Detailed implementation manner

[0081] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

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

[0083] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "horizontal", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In this application, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0084] In this application, unless otherwise clearly defined or limited, terms such as "connected", "connected to", "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. However, indicating a direct connection means that there is no connection relationship constructed through an excessive structure between the two connected main bodies, and they are only connected through the connection structure to form a whole. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0085] In this application, descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include at least one of such features.

[0086] Figure 1 is a schematic structural diagram of an electric cutting knife provided by an embodiment of this application, Figure 2 is a cross-sectional view of an electric cutting knife provided by an embodiment of this application, Figure 3 is Figure 1 a partial enlarged view of the position A in Figure 4 is a partial view of an electric cutting knife provided by an embodiment of this application Figure 1 ; Figure 5 is a partial cross-sectional view of an electric cutting knife provided by an embodiment of this application Figure 2 , Figure 6 is a partial cross-sectional view of an electric cutting knife provided by an embodiment of this application Figure 3 . Referring to Figures 1 to 6 as shown, an embodiment of this application provides an electric cutting knife, including a first handle 100.

[0087] In some examples, the first handle 100 can be in a strip structure. An inner cavity is formed in the first handle 100, and a guide groove is 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 the guide groove communicates with the inner cavity of the first handle 100.

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

[0089] Referring to Figure 1 and Figure 5 as shown, in some examples, the electric cutting knife can include an outer sheath tube assembly 200. The outer sheath tube assembly 200 is connected to the first handle 100. For example, the outer sheath tube assembly 200 can be connected to the distal end of the first handle 100.

[0090] In some examples, a power connector 213 for connecting to an external power source is provided on the outer sheath tube assembly 200. It is electrically connected to the external power source through the power connector 213 to facilitate powering the electrical components of the electrocautery knife.

[0091] Of course, in other examples, the power connector 213 can also be provided at other positions, such as the first handle 100, the rotation knob 1000 mentioned below, or the second handle 300. The embodiments of the present application do not limit the position of the power connector 213.

[0092] In some examples, the electrocautery knife may include a second handle 300. The second handle 300 is provided on the first handle 100 and can move axially along the first handle 100.

[0093] Exemplarily, the second handle 300 is sleeved on the first handle 100 and can move along the guiding groove of the first handle 100 to drive the structural member connected to the second handle 300 to move axially along the first handle 100, so as to realize the switching of the electrocautery knife in different functional states.

[0094] In some examples, ear rings are provided on both sides of the second handle 300 to facilitate the operator to hold the two ear rings and operate the second handle 300.

[0095] In some examples, a liquid injection port 310a is provided on the second handle 300. The liquid injection port 310a is used to inject liquid into the liquid injection flow channel of the electrocautery knife. Exemplarily, the liquid injection port 310a can be provided on the side wall of the second handle 300 to facilitate the operator to inject liquid.

[0096] Referring to Figure 6 As shown, in some examples, a second liquid injection cavity 310 is formed in the second handle 300. One end of the second liquid injection cavity 310 is communicated with the liquid injection port 310a. It can be understood that the liquid injection flow channel includes the second liquid injection cavity 310.

[0097] Referring to Figure 1 、 Figure 3 and Figure 4 As shown, in some examples, the electrocautery knife may include a cutter head 400. The cutter head 400 is connected to the second handle 300 through a conductive component 500 to extend or retract out of the outer sheath tube assembly 200 under the drive of the second handle 300.

[0098] Exemplarily, the proximal end of the conductive component 500 can extend into the inner cavity of the first handle 100 through the distal end of the first handle 100. The second handle 300 can extend into the inner cavity of the first handle 100 through the guiding groove on the side wall of the first handle 100 and be connected to the proximal end of the conductive component 500. Thus, during the movement of the second handle 300 along the guiding groove, the conductive component 500 and the cutting head 400 can be driven to move along the axial direction of the first handle 100, so that the cutting head 400 can extend or retract into the outer sheath tube assembly 200.

[0099] For example, when performing a transurethral resection of the prostate on a patient, in order to avoid damage to the patient's internal tissues by the cutting head 400, the second handle 300 can be first moved towards the proximal end of the first handle 100 to retract the cutting head 400 into the inner part of the outer sheath tube assembly 200. When it is necessary to use the transurethral resection knife to perform operations such as cutting on tissues, the second handle 300 can be moved towards the distal end of the first handle 100 to extend the cutting head 400 a first preset distance from the distal end of the outer sheath tube assembly 200, so that the cutting head 400 can cut the target tissue or perform other operations.

[0100] It can be understood that the above-mentioned first preset distance can be adaptively adjusted according to the actual surgical requirements of the transurethral resection knife, and no limitation is made here.

[0101] In some examples, the cutting head 400 can be electrically connected to the power connector 213 through the conductive component 500. It can be 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 cutting head 400, so that the cutting head 400 is electrically connected to the power connector 213. Thus, when the power connector 213 is conducted with an external power source, power can be supplied to the cutting head 400 through the conductive component 500, enabling the cutting head 400 to achieve the cutting function.

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

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

[0104] Referring to Figure 3 and Figure 4As shown, in some examples, a first liquid injection cavity 400a is formed inside the cutter head 400 and penetrates through the distal end of the cutter head 400. For example, a liquid outlet 400b is formed at the distal end of the cutter head 400, and the liquid outlet 400b communicates with the first liquid injection cavity 400a inside the cutter head 400. In this way, the liquid flowing into the first liquid injection cavity 400a can flow out of the cutter head 400 through the liquid outlet 400b to be injected into positions such as the submucosa, facilitating the subsequent rapid dissection of the mucosa.

[0105] It can be understood that the liquid injection flow channel further includes a second liquid injection cavity 310.

[0106] Referring to Figure 4 As shown, in some examples, at least a part of the outer sheath tube assembly 200 is sleeved on the conductive assembly 500, and a liquid injection channel 530a is formed between at least a part of the outer sheath tube assembly 200 and the conductive assembly 500. Among them, the proximal end of the liquid injection channel 530a communicates with the liquid injection port 310a, and the distal end of the liquid injection channel 530a communicates with the first liquid injection cavity 400a. For example, the proximal end of the liquid injection channel 530a can communicate with the liquid injection port 310a through the second liquid injection cavity 310 inside the second handle 300.

[0107] In some examples (not shown in the figure), the outer sheath tube assembly 200 can form a liquid injection channel 530a between the entire outer wall of the conductive assembly 500, so that the proximal end of the liquid injection channel 530a extends into the second handle 300 and communicates with the second liquid injection cavity 310 inside the second handle 300, and the proximal end of the liquid injection channel 530a extends to the cutter head 400 and communicates with the first liquid injection cavity 400a of the cutter head 400. It can be understood that the liquid injection flow channel further includes the liquid injection channel 530a.

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

[0109] Continuing to refer to Figure 4 and Figure 5 As shown, in some examples, the outer sheath tube assembly 200 can form a liquid injection channel 530a between at least a part of the conductive assembly 500 located on the distal end side of the power supply connector 213.

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

[0111] Exemplarily, the power connector 213 is in electrical contact with the outer wall of the conductive component 500. Thus, the power connector 213 divides the conductive component 500 into two parts. One part (e.g., the first section) is located on the proximal side of the power connector 213, and the other part (e.g., the second section) is located on the distal side of the power connector 213. A liquid injection channel 530a is formed between the outer sheath tube assembly 200 and at least a part of the second section of the conductive component 500.

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

[0113] In some examples, the liquid injection channel 530a can be formed between the entire second section of the outer sheath tube assembly 200 and the conductive component 500, so that the proximal end of the liquid injection channel 530a extends to the power connector 213, and the distal end of the liquid injection channel 530a can extend to the proximal end of the cutter head 400.

[0114] In some examples, the liquid injection channel 530a can be formed between a part of the second section of the outer sheath tube assembly 200 and the conductive component 500. For example, the liquid injection channel 530a is formed between the middle part of the second section of the conductive component 500 and the outer sheath tube assembly 200. The proximal end of the liquid injection channel 530a can communicate with the channel at the first section of the conductive component 500 through the inner cavity of the proximal part of the second section of the conductive component 500 itself or other channels (a part of the liquid injection flow path) to communicate with the liquid injection port 310a. The distal end of the liquid injection channel 530a can communicate with the first liquid injection cavity 400a through the inner cavity of the distal part of the second section of the conductive component 500 or other channels (a part of the liquid injection flow path).

[0115] In some examples, the liquid injection channel 530a can be formed between the distal part of the second section of the outer sheath tube assembly 200 and the conductive component 500, so that the distal end of the liquid injection channel 530a extends to the proximal end of the cutter head 400, and the proximal end of the liquid injection channel 530a communicates with the liquid injection port 310a through a channel (a part of the liquid injection flow path) formed at other parts of the second section of the conductive component 500.

[0116] Of course, in other examples, a liquid injection channel 530a can be formed between the outer sheath tube assembly 200 and the proximal portion of the second section of the conductive assembly 500, such that the distal end of the liquid injection channel 530a communicates with the first liquid injection cavity 400a through a channel formed at other portions of the second section of the conductive assembly 500. The proximal end of the liquid injection channel 530a extends to the power supply connector 213 and communicates with the liquid injection port 310a through a channel formed at the first section of the conductive assembly 500.

[0117] The embodiments of the present application do not limit the position and length of the liquid injection channel 530a, as long as it is ensured that the liquid injection channel 530a is located on the distal side of the power supply connector 213, communicates with the liquid injection port 310a, and the distal end of the liquid injection channel 530a communicates with the first liquid injection cavity 400a of the cutter head 400.

[0118] In this way, when liquid injection is required, such as injecting liquid into the submucosa, the liquid can enter the electrotome through the liquid injection port 310a of the second handle 300, flow out of the cutter head 400 through the liquid injection channel 530a and the first liquid injection cavity 400a, and be injected into the submucosa to achieve the dissection of the mucosa.

[0119] It can be understood that after liquid injection, there is no need to replace the instrument, and the target tissue can continue to be cut through the cutter head 400 of the electrotome, which can reduce the number of times of replacing surgical instruments, shorten the operation time, and also reduce the secondary injury to the patient.

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

[0121] Wherein, the angle can be an acute angle, a right angle or an obtuse angle. The embodiments of the present application do not limit the angle of this angle, and can be specifically adjusted according to actual cutting requirements.

[0122] The setting of the bent portion 420 can increase 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 liquid injection cavity 400a is located within the main body portion 410 and penetrates through the distal end of the main body portion 410. For example, the first liquid injection cavity 400a is located on the axis of the main body portion 410, and the liquid outlet 400b is located on the distal end face of the main body portion 410. In this way, the flow rate of the liquid flowing out of the liquid outlet 400b can be enhanced, so as to facilitate the rapid dissection of the submucosa by the impact of the liquid.

[0124] By setting the cutter head 400 as a hook knife structure, it is beneficial to quickly lift and electrically cut the mucosa. Because during the lifting and cutting process, the movement direction of the hook knife is away from the cut wound surface, which is very beneficial for preventing accidental perforation during the operation. In order to complete the cutting of the wound tissue, the direction of the hook tip (such as the bending part 420) needs to be continuously adjusted during the cutting process. Therefore, the hook knife needs to have the basic function of rotating the cutter head.

[0125] On the basis of realizing the function of the rotating cutter head, the hook knife with the liquid injection function adds the function of liquid output at the head. Such a design is more convenient for the operator to inject liquid and bulge the submucosa during the gap of the wound surface cutting process, further improving the safety of using the hook knife and avoiding the disadvantages of frequent instrument replacement. Refer to Figure 1 and Figure 6 As shown, in some examples, the electrocautery knife may further include a rotating knob 1000. The proximal end of the outer sheath tube assembly 200 can be connected to the first handle 100 through the rotating knob 1000. The rotating knob 1000 is axially relatively fixed with respect to the outer sheath tube assembly 200 and the first handle 100 on the axis of the first handle 100, so that the first handle 100, the rotating knob 1000 and the outer sheath tube assembly 200 are axially relatively stationary with respect to the first handle 100 and can move synchronously along the axis of the first handle 100.

[0126] It should be noted that Figure 2 the dotted line l in

[0127] is 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 electrocautery knife.

[0128] In some examples, the rotating knob 1000 can rotate around the axis l of the first handle 100 with respect to the outer sheath tube assembly 200 and the first handle 100. For example, one end of the rotating knob 1000 can be axially limited with the proximal end of the outer sheath tube assembly 200 through structures such as an annular protrusion and a groove, and it is ensured that the rotating knob 1000 can rotate around the axis of the outer sheath tube assembly 200 with respect to the proximal end of the outer sheath tube assembly 200. Similarly, one end of the rotating knob 1000 can be axially limited with the distal end of the first handle 100 through structures such as an annular protrusion and a groove, and it is ensured that the rotating knob 1000 can rotate around the axis of the first handle 100 with respect to the distal end of the first handle 100.

[0128] It can be understood that the axis of the outer sheath tube assembly 200 and the axis of the first handle 100 can coincide.

[0129] Refer to Figure 6 As shown, in some examples, the conductive component 500 is movably inserted through the rotating knob 1000, and the rotating knob 1000 is configured to drive the conductive component 500 and the cutter head 400 to rotate around the axis of the first handle 100.

[0130] For example, a mating portion 540 is provided on the conductive component 500, and the rotary knob 1000 mates with the mating portion 540 to drive the conductive component 500 to rotate around the axis of the first handle 100.

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

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

[0133] Regarding the addition of the liquid injection function, considering the safety and effectiveness of using the instrument, it is necessary to complete the channel design for the entire liquid flow process from input to output, and prevent liquid leakage. For example, when injecting liquid after the cutter head 400 rotates to the in-place position, the sealing performance of the hydraulic system of the entire electrocautery knife is particularly important. Figure 7 Yes Figure 5 The partial enlarged view at B Figure 8 is a partial cross-sectional view of one of the electrocautery knives provided by an embodiment of the present application at the distal end of the outer sheath tube assembly. Refer to Figure 7 and Figure 8 As shown, in some examples, the electrocautery knife may further include a first sealing structure 600. The first sealing structure 600 is disposed between the proximal side and the distal side of the liquid injection channel 530a to enable the liquid injected from the liquid injection port 310a to flow into the liquid injection channel 530a and the first liquid injection cavity 400a in sequence, reducing or avoiding liquid leakage from other positions at the proximal or distal end of the liquid injection channel 530a.

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

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

[0136] For another example, a first sealing structure 600 may be provided on the distal side of the liquid injection channel 530a to reduce the risk of leakage of the liquid in the liquid injection channel 530a from other positions on the distal side of the liquid injection channel 530a, and to alleviate or avoid the situation where the liquid flows out from the side wall of the cutter head 400 on the distal side of the liquid injection channel 530a, which may affect the liquid injection effect. This allows the liquid to enter the first liquid injection cavity 400a of the cutter head 400 to a greater extent through the liquid injection channel 530a and flow out through the liquid outlet 400b at the distal end of the cutter head 400, thereby improving the liquid injection effect.

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

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

[0139] For example, during the cutting process of the target tissue in the submucosa, the conductive component 500 and the cutter head 400 rotate around the axis l of the electrocautery knife. After the cutter head 400 rotates into place, liquid is injected into the submucosa. During this process, the provision of the first sealing structure allows the liquid to flow into the submucosa from the liquid injection port 310a of the cutter 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, after the cutter head 400 rotates into place, when injecting liquid, the liquid will not leak from the proximal side of the liquid injection channel 530a, thereby reducing or avoiding contamination of the structural members on the proximal side of the liquid injection channel 530a, such as the power connector 213, by the liquid.

[0141] Referring to Figure 4 As shown, in some examples, the conductive component 500 may include a first conductive member 510, a conductive element 530, and a second conductive member 520 that are connected in sequence from the proximal end to the distal end. Among them, the proximal end of the first conductive member 510 is in communication with the liquid injection port 310a.

[0142] In some examples, the proximal end of the first conductive member 510 extends into the second injection cavity 310 of the second handle 300, and is connected to the injection port 310a through the second injection cavity 310. In addition, the first conductive member 510 is fixedly connected to the second handle 300 so as to move relative to the first handle 100 and the outer sheath tube assembly 200 under the drive of the second handle 300. The power connector 213 is electrically connected to the first conductive member 510, for example, the power connector 213 is in electrical contact with the outer side wall of the first conductive member 510. The distal end of the first conductive member 510 is connected to the proximal end of the conductive element 530.

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

[0144] In some examples, the distal end of the first conductive member 510 and the conductive element 530 may be connected by welding, sleeve connection, or clamping, and the connection method between the first conductive member 510 and the conductive element 530 is not limited. Similarly, the connection method between the proximal end of the second conductive member 520 and the conductive element 530, the connection method between the proximal end of the first conductive member 510 and the second handle 300, and the connection method between the distal end of the second conductive member 520 and the blade head 400 are not limited.

[0145] The setting of the conductive element 530 can reduce the rigidity of the conductive component 500 and increase the freedom of movement of the conductive component 500, so that the blade head 400 at the distal end of the conductive component 500 can be radially deflected or axially extended and retracted (the second handle 300 does not move) according to actual surgical needs, thereby improving the surgical accuracy of the electric cutting knife.

[0146] Exemplarily, the conductive element 530 may be a structure such as a metal wire or a hypotube, and the structure of the conductive element 530 is not limited herein.

[0147] In some examples, the first conductive member 510 and the second conductive member 520 may be tubular members. Exemplarily, the tubular member may be a structure of any shape such as a round tube, a barrel-shaped polygonal tube, etc., and the structures of the first conductive member 510 and the second conductive member 520 are not limited here. In some examples, the outer sheath tube assembly 200 is at least sleeved on the conductive element 530, the first conductive member 510 and the second conductive member 520, and forms an injection channel 530a between the outer sheath tube assembly 200 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 , and the gap between the conductive element 530 and the outer sheath tube assembly 200 can be used as an injection channel 530a for liquid flow.

[0149] In some examples, the proximal end of the liquid injection channel 530a is in communication with the first conductive member 510, and the distal end of the liquid injection channel 530a is in communication with the second conductive member 520. For example, the first lumen 510a of the first conductive member 510 can serve as a channel for liquid flow, enabling the proximal end of the liquid injection channel 530a to communicate with the liquid injection port 310a on the second handle 300, and the second lumen 520a of the second conductive member 520 can serve as a channel for liquid flow, enabling the distal end of the liquid injection channel 530a to communicate with the first liquid injection cavity 400a on the cutter head 400, thereby simplifying the structural arrangement of the channels for liquid circulation within the electrocautery knife.

[0150] In some examples, an intermediate liquid outlet 510b may be formed at the distal end of the first conductive member 510, and the proximal end of the liquid injection channel 530a may communicate with the first lumen 510a of the first conductive member 510 through the intermediate liquid outlet 510b.

[0151] Exemplarily, the intermediate liquid outlet 510b may be provided on the distal end face of the first conductive member 510 or on the side wall of the distal end of the first conductive member 510, and can be specifically adjusted according to the connection position of the conductive element 530 and the first conductive member 510. For example, since the proximal end of the conductive element 530 is connected to the distal end face of the first conductive member 510, the intermediate liquid outlet 510b can be provided on the side wall of the distal end of the first conductive member 510.

[0152] In some examples, an inlet 520b may be formed at the proximal end of the second conductive member 520, and the distal end of the liquid injection channel 530a may communicate with the second lumen 520a of the second conductive member 520 through the inlet 520b.

[0153] Exemplarily, the inlet 520b may be provided on the proximal end face of the second conductive member 520 or on the side wall of the proximal end of the second conductive member 520, and can be specifically adjusted according to the connection position of the conductive element 530 and the second conductive member 520, which will not be elaborated here.

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

[0155] Exemplarily, when the power connector 213 is provided on the outer sheath tube assembly 200, the first sealing structure 600 can be provided at least at one of the positions between the cutter head 400 and between the cutter head 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, the liquid in the liquid injection channel 530a can be restricted from flowing into the second handle 300 through the inner sidewall of the outer sheath tube assembly 200. For example, when the first sealing structure 600 is disposed between the cutter head 400 and the power connector 213, the liquid in the liquid injection channel 530a can be restricted from flowing into the power connector 213 through the inner sidewall of the outer sheath tube assembly 200. That is, the liquid outside the entire liquid injection flow path is restricted to the area between the cutter head 400 and the power connector 213, preventing the liquid outside the liquid injection flow path from flowing out of the sidewall of the cutter head 400 or entering the power connector 213 and causing contamination to the power connector 213.

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

[0158] Refer to Figure 7 As shown, in some examples, the first sealing structure 600 includes a first seal 610. The first seal 610 is disposed between the first conductive member 510 and the outer sheath tube assembly 200 and is located on the side of the second handle 300 facing the cutter head 400 to block the liquid in the liquid injection channel 530a on the side of the second handle 300 facing the cutter head 400. In this way, the liquid in the liquid injection channel 530a can be prevented from flowing into the second handle 300 through the gap between the first conductive member 510 and the outer sheath tube assembly 200.

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

[0160] In some examples, the first seal 610 can be an annular structure. The first seal 610 is sleeved on the first conductive member 510, and the outer sheath tube assembly 200 is sleeved on the first seal 610, so that the annular gap between the first conductive member 510 and the outer sheath tube assembly 200 is filled with 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 shrink film. For example, the outer wall of the proximal end of the first seal 610 is attached to the inner wall of the outer sheath assembly 200, and there is a gap between the outer wall of the distal end 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 contract towards the first conductive member 510 under the action of liquid pressure.

[0163] It should be noted that the proximal end of a certain component in the embodiments of the present application refers to the proximal end of the component and a part (a part on the component) 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 a part of the outer wall at a third preset distance from the proximal end.

[0164] Similarly, the distal end of a certain component in the embodiments of the present application refers to the distal end of the component and a part (a part on the component) 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 a part at a third preset distance from the distal end.

[0165] Among them, the above-mentioned third preset distance can be adjusted according to the overall length of the actual component. For example, the above-mentioned third preset distance can be a suitable length value such as 1 / 4 of the overall length of the component, and the preset distance is not limited here.

[0166] By setting a gap between the outer wall of the distal end of the first seal 610 and the inner wall of the outer sheath assembly 200, in this way, the liquid in the liquid injection channel 530a can enter the outer wall of the first seal 610 along this gap and squeeze the first seal 610, so that the inner wall of the first seal 610 contracts towards the first conductive member 510, thereby increasing the contact tightness between the first seal 610 and the first conductive member 510 and improving the sealing performance between the distal part of the first seal 610 and the first conductive member 510. In addition, by attaching the outer wall of the proximal end of the first seal 610 to the inner wall of the outer sheath assembly 200, the sealing performance between the distal part of the first seal 610 and the outer sheath assembly 200 can be ensured.

[0167] In this way, the sealing performance between the first seal 610 and the outer sheath assembly 200 and the first conductive member 510 in the entire extending direction can be ensured, reducing or avoiding the liquid in the liquid 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 avoiding the liquid in the liquid injection channel 530a from entering the power connector 213 through the gap between the first seal 610 and the first conductive member 510, thereby contaminating the power connector 213.

[0168] In addition, by attaching the outer side wall of the proximal end of the first seal 610 to the inner wall of the outer sheath tube assembly 200, the distal side wall of the first seal 610 contracts towards the first conductive member under the pressure of the liquid. As a result, the degree of fitting between the distal side wall of the first seal 610 and the first conductive member is relatively weak in the state without liquid. In this way, during the telescopic or rotational movement of the tool head 400 and the conductive assembly 500 in the non-liquid injection state, they can move smoothly relative to the first seal 610, reducing the frictional force between the conductive assembly 500, such as the first conductive member 500, and the first seal 610 during movement or rotation. Thus, the stability of the first seal 610 during the movement of the conductive assembly 510 is ensured, and the position control of the first seal 610 in the liquid injection state is ensured, achieving effective sealing of the proximal side of the liquid injection 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 need to 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. Among them, 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 end of the power connector 213 facing the tool head 400, or it may not need to 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. The embodiments of the present application do not limit the second distance, which 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 tube assembly 200 may include a protection tube 210 and an outer sheath tube 220. Among them, the proximal end of the protection tube 210 is connected to the first handle 100 through a joint seat 211; the power connector 213 is inserted into the joint seat 211, the outer sheath tube 220 is arranged inside the protection tube 210, and the distal end of the outer sheath tube 220 extends out of the distal end of the protection tube 210, and the tool head 400 can extend or retract into the outer sheath tube 220.

[0172] In this example, a part of the conductive assembly 500 passes through the outer sheath tube 220, and another part passes through the protection tube 210 and is connected to the second handle 300 to telescopically move relative to the outer sheath tube 220 and the protection tube 210 under the drive of the second handle 300.

[0173] It can be understood that the joint base 211 has a through channel intersecting with the axis of the protective tube 210. The through channel penetrates both ends of the joint base 211. The power connector 213 is arranged inside the joint base 211. One end of the power connector 213 away from the conductive component 500 extends out of the outer end of the joint base 211 to be docked with an external power supply. One end of the power connector 213 close to the conductive component 500 extends out of the inner end of the joint base 211 and is in electrical contact with the conductive component 500, such as the first conductive member 510.

[0174] The arrangement of the protective tube 210 serves to protect the outer sheath tube 220 and prevent the outer sheath tube 220 from being bent.

[0175] In some examples, the outer sheath tube assembly 200 may also include only the outer sheath tube 220 or the protective tube 210. One end of the outer sheath tube 220 or the protective tube 210 is connected to the first handle 100, and the other end of the outer sheath tube 220 or the protective tube 210 is for the cutter head 400 to extend or retract to protect the cutter head 400. The embodiments of the present application do not limit the structural arrangement of the outer sheath tube assembly 200, as long as it can achieve the purpose of protecting the cutter head 400.

[0176] In some examples, the joint base 211 extends an inner connection portion 211a towards the inside of the protective tube 210, and the proximal end of the outer sheath tube 220 is sleeved on the connection portion 211a to realize the connection between the outer sheath tube 220 and the protective tube 210.

[0177] Refer to Figure 7 As shown, in some examples, when the proximal end of the outer sheath tube 220 is sleeved on the connection portion 211a, it can be welded to the connection portion 211a or connected to the connection portion 211a by a buckle. The embodiments of the present application do not limit the connection manner between the outer sheath tube 220 and the connection portion 211a, as long as it can ensure the fixed connection between the outer sheath tube 220 and the connection portion 211a.

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

[0179] For example, a protrusion 2111 can be formed on the outer sidewall of the connection portion 211a, and a groove matching the protrusion 2111 can be formed on the inner sidewall of the outer sheath tube 220. The protrusion 2111 is embedded in the groove.

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

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

[0182] It can be understood that a step is formed between the distal end of the connecting portion 211a and the outer sidewall of the first conductive member 510. When a part of the outer sheath tube 220 is sleeved on the connecting portion 211a, a transition space will be formed at the distal end of the outer sheath tube 220 and the connecting portion 211a. This transition space is extremely likely to accumulate liquid, causing the liquid to penetrate to the power supply connector 213 through the gap between the outer sheath tube 220 and the connecting portion 211a, or through the gap between the connecting portion 211a and the first conductive member 510.

[0183] In the embodiment of the present application, by arranging the first portion 611 of the first seal 610 between the outer sheath tube 220 and the first conductive member 510, and the second portion 612 of the first seal 610 extending between the outer sheath tube 220 and the connecting portion 211a, that is, the first seal 610 covers the above-mentioned transition space. In this way, 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 tube 220, the liquid in the liquid injection channel 530a cannot enter this transition space, and thus cannot penetrate to the power supply connector 213.

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

[0185] In some examples, the proximal end of the first seal 610 may also extend to the distal side of the first protrusion 2111 of the connecting portion 211a close to the cutter head 400. Through the protrusion 2111, a limiting effect can be exerted on the first seal 610 in the axial direction of the outer sheath assembly 200, avoiding affecting the axial stability of the first seal 610 when the conductive assembly 500 drives the cutter head 400 to move axially relative to the outer sheath tube 220.

[0186] The embodiment of the present application does not limit the extension length and extension position of the first seal 610.

[0187] Figure 9 FIG. Figure 9 is a partial cross-sectional view of another electrotome at the distal end of the outer sheath tube assembly according to an embodiment of the present application. Figure 10 FIG. Figure 10 is a schematic structural view of a second conductive member according to an embodiment of the present application. Figure 11 FIG. Figure 11 is a partial cross-sectional view of still another electrotome at the distal end of the outer sheath tube assembly according to an embodiment of the present application. Refer to Figures 8 to 11 As shown in FIG. Figures 8 to 11 , in some examples, the first sealing structure 600 includes a second seal 620. The second seal 620 is disposed between at least one of the second conductive member 520 and the cutter head 400 and the outer sheath tube assembly 200. The distal end of the liquid injection channel 530a is communicated through a liquid inlet 520b provided on the second conductive member 520. The second seal 620 is located on the side of the liquid inlet 520b facing the cutter head 400.

[0188] In this way, on the basis of ensuring that the liquid in the liquid injection channel 530a can enter the second lumen 520a of the second conductive member 520 through the liquid inlet 520b, the second seal 620 can seal the gap between the second conductive member 520 (or the cutter head 400) and the outer sheath tube assembly 200, reducing or preventing the liquid in the liquid injection channel 530a from entering the outer sidewall of the cutter head 400 through this gap and flowing out of the distal end of the electrotome through the outer sidewall of the cutter head 400, so that the liquid in the liquid injection channel 530a can flow out of the electrotome through the first liquid injection cavity 400a and the liquid outlet 400b of the cutter head 400 to a greater extent, thereby increasing the liquid pressure at the liquid outlet 400b and ensuring the impact and peeling effect on the submucosa.

[0189] Exemplarily, the second seal 620 can be sleeved between the second conductive member 520 and the outer sheath tube assembly 200 (such as the outer sheath tube 220), or can be sleeved between the cutter head 400 and the outer sheath tube assembly 200 (such as the outer sheath tube 220).

[0190] In some examples, the second seal 620 can include, but is not limited to, a sealing ring, a heat shrinkable film, etc. The structure of the second seal 620 is not limited herein as long as it can achieve a sealing effect.

[0191] Refer to Figure 8 As shown in FIG. Figure 8 , in some examples, in order to insulate between the cutter head 400 and the outer sheath tube assembly 200, the electrotome can further include an insulating sleeve 700. The insulating sleeve 700 is disposed inside the distal end of the outer sheath tube assembly 200, and the cutter head 400 movably passes through the insulating sleeve 700.

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

[0193] Exemplarily, a protrusion 2111 can be provided on the outer sidewall of the insulating sleeve 700, and a groove matching the protrusion 2111 can be provided on the other of the inner sidewalls of the outer sheath tube 220. The protrusion 2111 is embedded in the groove.

[0194] In some examples, in order to enable the cutter head 400 to move relative to the insulating sleeve 700, there is an assembly gap between the cutter 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. Thus, the liquid injection channel 530a can be sealed and isolated from the insulating sleeve 700 in the axial direction of the electrosurgical knife, reducing or avoiding the liquid in the liquid injection channel 530a from flowing out of the distal end of the electrosurgical knife through the assembly gap between the inner wall of the insulating sleeve 700 and the cutter head 400, thereby improving the liquid injection effect. In addition, the setting of the second seal 620 can also reduce or avoid the liquid in the liquid injection channel 530a from flowing out of the distal end of the electrosurgical knife through the gap between the outer sidewall of the insulating sleeve 700 and the outer sheath tube 220.

[0196] In some examples, the outer sidewall of the second seal 620 is connected to the outer sheath tube assembly 200, and the cutter head 400 and the conductive assembly 500 can move relative to the second seal 620. Thus, the second seal 620 can be pre-assembled on the outer sheath tube assembly 200, and then the cutter head 400 can be passed through the second seal 620, making the assembly of the entire electrosurgical knife simpler and faster.

[0197] In addition, after the position of the second seal 620 on the outer sheath tube assembly 200 is determined, during the axial movement of the cutter head 400 along the outer sheath tube assembly 200, it can always maintain close contact with the second seal 620. On the basis of ensuring the sealing contact between the outer sidewall of the second seal 620 and the inner sidewall of the outer sheath tube assembly 200, it can ensure the sealing contact between the inner sidewall of the second seal 620 and the outer sidewall of the cutter head 400, thereby ensuring that the liquid will not flow out along the outer sidewall of the cutter head 400 or the outer sidewall of the insulating sleeve 700.

[0198] In some examples, the second seal 620 can be directly bonded or snap - connected to the inner wall of the outer sheath assembly 200, such as the inner wall of the outer sheath 220.

[0199] In some examples, the electro - surgical knife can further include a mounting seat 800. The mounting seat 800 is hermetically arranged on the inner side wall of the distal end of the outer sheath assembly 200 and is located on the side of the insulating sleeve 700 facing the second conductive member 520. The cutter head 400 movably penetrates through the mounting seat 800. An installation cavity 810 is formed on the mounting seat 800. The second seal 620 is sleeved on the cutter head 400 and is located within the installation cavity 810.

[0200] In some examples, the outer side wall of the mounting seat 800 can be hermetically connected to the inner side wall of the outer sheath assembly 200 by bonding or snap - connecting or other means. The second seal 620 is received within the installation cavity 810 of the mounting seat 800. A through - channel is formed in the middle of the mounting seat 800. The cutter head 400 movably penetrates through the second seal 620 and passes through the mounting seat 800 through the through - channel.

[0201] The arrangement of the mounting seat 800 can achieve better sealing between the outer wall of the second seal 620 and the outer sheath assembly 200. For example, by flexibly setting the structure of the mounting seat 800, the cavity wall of the installation cavity 810 in the mounting seat 800 can well fit the outer wall of the second seal 620, ensuring the sealing performance between the second seal 620 and the mounting seat 800, and further ensuring the sealing performance between the second seal 620 and the outer sheath assembly 200. During assembly, the second seal 620 can be first assembled into the mounting seat 800, then the mounting seat 800 is assembled onto the inner side wall of the outer sheath assembly 200, and then the cutter head 400 is passed through the mounting seat 800 and the second seal 620.

[0202] In some examples, the inner diameter of the distal end of the outer sheath assembly 200, such as the outer sheath 220, is larger than the inner diameter of other parts, so that a step surface facing the distal end is formed on the inner side wall of the distal end of the outer sheath 220. The mounting seat 800 can abut against this step surface to play an axial positioning role for the mounting seat 800.

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

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

[0205] Exemplarily, a part of the mounting base 800 close to the opening 820 can be sleeved on 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 face of the end wall 830 of the mounting base 800 (the side of the end wall 830 facing the installation cavity 810). The remaining outer side walls of the second seal 620 can abut against other inner walls of the mounting base 800, thereby enhancing the sealing performance around the outer wall of the second seal 620 and preventing the liquid in the liquid 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 electrosurgical knife.

[0207] In some examples, the side of the end wall 830 facing away from the installation cavity 810 is configured to contact the second conductive member 520 at least when the cutter head 400 is being injected with liquid.

[0208] Exemplarily, after the distal end of the cutter head 400 is assembled with the second conductive member 520, the outer diameter of the second conductive member 520 is greater than the outer diameter of the cutter head 400, such that the distal end portion of the second conductive member 520 is exposed outside the cutter head 400. For example, an assembly cavity may be formed at the distal end of the second conductive member 520, and at least a part of the distal end of the cutter head 400 can extend into the assembly cavity. That is, the distal end of the second conductive member 520 is sleeved on the distal end of the cutter head 400 to increase the connection stability between the second conductive member 520 and the cutter head 400. Among them, the side wall of the distal end of the cutter head 400 can be connected to the inner wall of the assembly cavity of the second conductive member 520 by means of bonding or the like.

[0209] When the cutter head 400 needs to perform cutting, the second handle 300 drives the conductive assembly 500 and the cutter head 400 to extend outwards towards the distal end of the outer sheath assembly 200, such that the distal end portion of the second conductive member 520 abuts against the outer side face of the end wall 830 of the mounting base 800, so as to improve the sealing performance between the second conductive member 520 and the mounting base 800, thereby reducing or avoiding the risk that the liquid enters the gap between the mounting base 800 and the cutter head 400 through the second conductive member 520 and the mounting base 800 during the liquid injection process.

[0210] In addition, after the cutter head 400 extends and retracts in place, in some cases, it will rotate along with the rotation of the cutter head 400. By abutting the end of the second conductive member 520 against the end wall 830 of the mounting seat 800, compared with directly abutting against the second seal 620, such as an O-ring, the rotational friction can be reduced, making the rotation of the cutter head 400 smoother. Also, it ensures that the rotation of the second conductive member 520 will not affect the stability of the second seal 620, thus ensuring that after the second conductive member 520 drives the cutter head 400 to rotate in place, the sealing effect of the second seal 620 on the distal end of the liquid injection channel 530a is not affected.

[0211] Continuing to refer to Figure 8 As shown, in some examples, the electrocautery knife may further include a metal member 900. The metal member 900 is disposed on the cutter head 400, and the second seal 620 and the insulating sleeve 700 are movably sleeved on the metal member 900.

[0212] In practice, when the cutter head 400 is injection-molded, the roughness of its outer surface is relatively high, affecting the contact tightness between the second seal 620 and the cutter head 400. Therefore, by providing the metal member 900 on the outside of the cutter head 400, the surface of the metal member 900 is relatively smooth, which can ensure the sealing between the second seal 620 and the cutter head 400.

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

[0214] In some examples, the metal member 900 can also be sleeved on the outer side wall of the cutter head 400 after the cutter head 400 is formed.

[0215] In some examples, the material of the metal member 900 can 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 member 900 is ensured so that the metal member 900 fits tightly with the second seal 620.

[0216] In some examples, the extended length of the metal member 900 can be equal to or less than the extended length of the cutter head 400. Here, the extended length of the metal member 900 is not restricted, as long as it is ensured that during the extension and retraction process of the cutter head 400, the second seal 620 is always in contact with the metal member 900.

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

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

[0219] For example, the second seal 620 is sleeved on the outer wall of the second conductive member 520 to seal the gap between the second conductive member 520 and the outer sheath tube assembly 200, so as to reduce or avoid the risk that the liquid in the liquid injection channel 530a flows 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 another example, the second seal 620 can be arranged at the end of the second conductive member 520 facing the insulating sleeve 700. When the cutter head 400 is in the liquid injection state, the second conductive member 520 abuts against the end face of the insulating sleeve 700 through the second seal 620 to seal the gap between the second conductive member 520 and the insulating sleeve 700, reducing or avoiding the risk that the liquid in the liquid injection channel 530a flows into the outer wall of the cutter head 400 through the gap between the second conductive member 520 and the insulating sleeve 700.

[0221] Refer to Figure 11 As shown, in some examples, the second seal 620 can be a heat shrinkable film. Exemplarily, a recess 522 is formed on the outer wall of the second conductive member 520. The second seal 620 is attached to the outer wall of the second conductive member 520, and at least part of the second seal 620 is located on the inner wall of the recess 522. In this way, the contact area between the second seal 620 and the second conductive member 520 can be increased, thereby increasing the tightness of the fit between the second seal 620 and the second conductive member 520.

[0222] In some examples, a plurality of spaced recesses 522 can be arranged along the axial direction of the second conductive member 520 to further increase the contact area between the second seal 620 and the second conductive member 520.

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

[0224] In some examples, the proximal end of the second seal 620 can extend to the edge of the liquid inlet 520b of the second conductive member 520 to seal the gap at the outer sidewall of the second conductive member 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 facing the insulating sleeve 700, the second seal 620 can be connected, for example, adhesively 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] Refer to Figure 9 As shown, in some examples, a part of the second conductive member 520 can be sleeved on the distal end of the second conductive member 520, and another part can protrude from the second conductive member 520 to abut against the end face of the insulating sleeve 700.

[0227] Refer to Figure 9 and Figure 10 As shown, exemplarily, an annular groove 521 can be formed at one end of the second conductive member 520 facing the insulating sleeve 700. A part of the second seal 620 is sleeved on the annular groove 521, and another part of the second seal 620 is sleeved on the tool bit 400. When the tool bit 400 is in the liquid injection state, the second seal 620 abuts against the end face of the insulating sleeve 700.

[0228] On the one hand, a part of the second seal 620 is sleeved on the annular groove 521, and the groove end wall 830 (the groove wall facing the insulating sleeve 700) of the annular groove 521 can play a limiting role on the second seal 620 to ensure the stability of the second seal 620 in the axial direction of the second conductive member 520. On the other hand, the second seal 620 is sleeved on the annular groove 521 to increase the contact area between the second seal 620 and the second conductive member 520, thereby increasing the contact tightness between the second seal 620 and the second conductive member 520, so as to ensure that the liquid in the liquid injection channel 530a will not enter the distal end of the second conductive member 520 through the gap between the second seal 620 and the second conductive member 520, and further ensure that the liquid will not flow into the side wall of the tool bit 400.

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

[0230] Figure 12 isFigure 6 Partial enlarged view at position C. Refer to Figure 12 As shown, in some examples, the electrocision knife may further include a second sealing structure 1100,

[0231] The second sealing structure 1100 is disposed between the outer sidewall of the conductive component 500 (such as the first conductive member 510) and the inner sidewall of the second handle 300 (i.e., the cavity wall of the second liquid injection cavity 310) to seal the gap between the conductive component 500 (such as the first conductive member 510) and the inner sidewall of the second handle 300. In this way, the liquid in the second liquid injection cavity 310 can be reduced or prevented from flowing into the gap between the first conductive member 510 and the inner sidewall of the second handle 300, for example, flowing to the power connector 213, which may cause the risk of contaminating the power connector 213. It can also reduce or avoid the risk that the liquid in the liquid injection channel 530a flows back to the liquid injection port 310a through the gap between the first conductive member 510 and the inner sidewall of the second handle 300, which may cause 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 may be provided at the distal end of the second liquid injection cavity 310. The proximal end of the first conductive member 510 is fixedly inserted through 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 liquid injection cavity 310 to ensure the sealing performance between the first conductive member 510 and the second liquid injection cavity 310.

[0234] In addition, by disposing the first conductive member 510 on the fixing seat 320, when the first conductive member 510 rotates around the axis of the electrocision knife, the fixing seat 320 can be driven to rotate relative to the second handle 300, which can ensure the cooperation stability between the first conductive member 510 and the second handle 300 during the rotation process.

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

[0236] In some examples, the second sealing structure 1100 may be connected to the cavity wall of the second liquid injection cavity 310. In this way, when the fixing seat 320 rotates, the second sealing structure 1100 remains stationary. Figure 13 It is a schematic structural diagram of one of the knife heads provided by an embodiment of the present application, Figure 14 It is a schematic structural diagram of another knife head provided by an embodiment of the present application, Figure 15 It is a schematic structural diagram of yet another knife head provided by an embodiment of the present application. Refer to Figures 13 to 15 As shown,

[0237] Refer to Figure 13As shown, in some examples, the main body portion 410 and the bent portion 420 can be an integrally formed one-piece, in other words, the cutter head 400 is integrally injection molded, which simplifies the assembly process of the cutter head 400 and also improves the structural strength of the cutter head 400.

[0238] Referring to Figure 14 and Figure 15 As shown, in some examples, the cutter head 400 is a split part formed by connecting multiple components together.

[0239] In some examples, the main body portion 410 and the bent portion 420 can be split parts connected together. For example, the main body portion 410 and the bent portion 420 can be separately manufactured first, and then the main body portion 410 and the bent portion 420 are connected together.

[0240] In some examples, the main body portion 410 can be set to two parts, one part (for example, the first part 413) is injection molded, and the other part (the second part 414) is integrally injection molded with the bent portion 420.

[0241] Among them, the second part 414 can be a sleeve portion formed at one end of the bent portion 420. The sleeve portion has an inner cavity, and the distal end of the first part 413 can pass through the inner cavity of the sleeve portion to be connected to the bent portion 420. Among them, one end of the sleeve portion 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 can 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] The embodiments of the present application do not limit the connection method between the main body portion 410 and the bent portion 420.

[0244] Referring to Figure 13 As shown, in some examples, the main body portion 410 includes a first main body 411 and a second main body 412 connected in sequence 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 bent portion 420; the outer diameter dimension of the first main body 411 is larger than the outer diameter dimension of the second main body 412. The first main body 411 is used to set the first sealing structure 600. In this way, the size of the cutter head 400 and the first sealing structure 600 can be more adapted, ensuring the sealing performance between the cutter head 400 and the first sealing structure 600.

[0245] In addition, the outer diameter dimension of the second main body 412 is smaller than the outer diameter dimension of the first main body 411, which can save the material used for the cutter head 400, save 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 easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments provided in this application to obtain other embodiments on the basis of several embodiments provided in this application, and these embodiments do not exceed the protection scope of this application.

[0247] The above specific implementation manners further elaborate in detail the purpose, technical solutions and beneficial effects of the embodiments of this application. It should be understood that the above are only the specific implementation manners of the embodiments of this application, and are not used to limit the protection scope of the embodiments of this application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of this application shall be included within the protection scope of the embodiments of this application.

Claims

1. An electrocision knife, characterized in that, Comprising: A first handle (100); An outer sheath tube assembly (200) connected to the first handle (100); A second handle (300) disposed on the first handle (100) and axially movable along the first handle (100), and a liquid injection port (310a) is provided on the second handle (300); A cutter head (400) connected to the second handle (300) through a conductive assembly (500) to extend or retract the outer sheath tube assembly (200) under the drive of the second handle (300). A first liquid injection cavity (400a) penetrating the distal end of the cutter head (400) is formed in the cutter head (400). At least a part of the outer sheath tube assembly (200) is sleeved on the conductive assembly (500), and a liquid injection channel (530a) is formed between at least a part of the outer sheath tube assembly (200) and the conductive assembly (500). The proximal end of the liquid injection channel (530a) communicates with the liquid injection port (310a), and the distal end of the liquid injection channel (530a) communicates with the first liquid injection cavity (400a); A first sealing structure (600) is disposed between the proximal side and the distal side of the liquid injection channel (530a) to enable the liquid injected from the liquid injection port (310a) to flow into the liquid injection channel (530a) and the first liquid injection cavity (400a) in sequence.

2. The electrotome according to claim 1, characterized in that, The conductive assembly (500) includes a first conductive member (510), a conductive element (530), and a second conductive member (520) connected in sequence from the proximal end to the distal end; The proximal end of the first conductive member (510) communicates with the liquid injection port (310a), the distal end of the second conductive member (520) is electrically connected to the cutter head (400) and communicates with the first liquid injection cavity (400a); At least a part of the outer sheath tube assembly (200) is sleeved on the conductive element (530), the first conductive member (510), and the second conductive member (520), and the liquid injection channel (530a) is formed between at least a part of the outer sheath tube assembly (200) and the conductive element (530). The proximal end of the liquid injection channel (530a) communicates with the first conductive member (510), and the distal end of the liquid injection channel (530a) communicates with the second conductive member (520).

3. The electrotome according to claim 1, wherein, The distal end of the outer sheath tube assembly (200) extends to the cutter head (400), and the first sealing structure (600) is disposed inside the outer sheath tube assembly (200) and at least at one of the cutter head (400), between the cutter head (400) and the second handle (300).

4. The electrocision knife according to claim 2, wherein, The first sealing structure (600) includes a first seal (610); The first seal (610) is disposed between the first conductive member (510) and the outer sheath tube assembly (200) and on the side of the second handle (300) facing the cutter head (400).

5. The electrocision knife according to claim 4, characterized in that, The proximal outer sidewall 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 sidewall of the first seal (610) and the outer sheath assembly (200) to allow liquid to enter the outer sidewall of the first seal (610) through the gap. The first seal (610) is configured to contract towards the first conductive member (510) under the action of liquid pressure.

6. The electric cutting knife according to claim 4, characterized in that, The outer sheath assembly (200) includes: A protective tube (210) whose proximal end is connected to the first handle (100) through a joint seat (211); the power connector (213) of the electrocautery knife is inserted into the joint seat (211). An outer sheath tube (220) is disposed within the protective tube (210), and the distal end of the outer sheath tube (220) extends beyond the distal end of the protective tube (210), and the cutter head (400) can extend or retract into the outer sheath tube (220).

7. The electrotome according to claim 6, characterized in that, The joint seat (211) extends an inner connecting portion (211a) towards the inside of the protective tube (210), and the proximal end of the outer sheath tube (220) is sleeved on the connecting portion (211a). The first part (611) of the first seal (610) is located between the outer sheath tube (220) and the first conductive member (510), and the second part (612) of the first seal (610) extends between the outer sheath tube (220) and the connecting portion (211a).

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

9. The electrocision knife according to claim 2, wherein, The first sealing structure (600) includes a second seal (620). The second seal (620) is disposed between at least one of the second conductive member (520) and the cutter head (400) and the outer sheath assembly (200). The distal end of the liquid injection channel (530a) is communicated through a liquid inlet (520b) provided on the second conductive member (520), and the second seal (620) is located on the side of the liquid inlet (520b) facing the cutter head (400).

10. The electrotome according to claim 9, wherein It further includes an insulating sleeve (700), the insulating sleeve (700) is disposed inside the distal end of the outer sheath assembly (200), and the cutter head (400) movably passes through the insulating sleeve (700). The second seal (620) is located on the side of the insulating sleeve (700) facing the conductive assembly (500).

11. The electrocision knife according to claim 10, characterized in that, The outer sidewall of the second seal (620) is connected to the outer sheath assembly (200), and the cutter head (400) and the conductive assembly (500) can move relative to the second seal (620).

12. The electrotome according to claim 11, characterized in that, It further includes a mounting base (800). The mounting base (800) is hermetically arranged on the inner side wall of the distal end of the outer sheath tube assembly (200) and is located on the side of the insulating sleeve (700) facing the second conductive member (520). The cutter head (400) movably penetrates through the mounting base (800). An installation cavity (810) is formed on the mounting base (800). The second seal (620) is sleeved on the cutter head (400) and is located within the installation cavity (810).

13. The electrocision knife 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) communicates with the installation cavity (810) and faces the insulating sleeve (700). One end face of the second seal (620) abuts against the insulating sleeve (700) through the opening (820). The other end face of the second seal (620) abuts against the side of the end wall (830) facing the installation cavity (810). The side of the end wall (830) facing away from the installation cavity (810) is configured to contact the second conductive member (520) at least when liquid is injected into the cutter head (400).

14. The electric cutting knife according to claim 11, wherein, It further includes a metal part (900). The metal part (900) is arranged on the cutter head (400). The second seal (620) and the insulating sleeve (700) are movably sleeved on the metal part (900).

15. The electrocision knife according to claim 10, characterized in that, The second seal (620) is fixedly arranged on the outer side wall of the second conductive member (520) or the end of the second conductive member (520) facing the insulating sleeve (700) to move along with the cutter head (400) and the conductive assembly (500).

16. The electrotome according to claim 15, characterized in that, A recess (522) is formed on the outer side wall of the second conductive member (520). The second seal (620) adheres to the outer side wall of the second conductive member (520), and at least a part of the second seal (620) is located on the inner wall of the recess (522).

17. The electrocision knife according to claim 15, wherein, An annular groove (521) is formed at one end of the second conductive member (520) facing the insulating sleeve (700). A part of the second seal (620) is sleeved on the annular groove (521), and another part of the second seal (620) is sleeved on the cutter head (400). When the cutter head (400) is in the liquid injection state, the second seal (620) abuts against the end face of the insulating sleeve (700).

18. The electrocision knife according to claim 1, characterized in that, It further includes a second sealing structure (1100). A second liquid injection cavity (310) communicating with the liquid injection port (310a) is formed within the second handle (300). The proximal end of the conductive assembly (500) extends into the second handle (300) and communicates with the second liquid injection cavity (310). The second sealing structure (1100) is arranged between the outer side wall of the conductive assembly (500) and the wall of the second liquid injection cavity (310).

19. The electrocision knife according to any one of claims 1-18, characterized in that, The cutter head (400) includes a main body part (410) and a bending part (420). The main body portion (410) is movably disposed within the outer sheath tube assembly (200), and the proximal end of the main body portion (410) is connected to the conductive assembly (500). The bending portion (420) is located at the distal end of the main body portion (410) and has an included angle with the main body portion (410). The first liquid injection cavity (400a) is located within the main body portion (410) and penetrates through the distal end of the main body portion (410).

20. The electrotome according to claim 19, wherein, The main body portion (410) and the bending portion (420) are integrally formed as one piece; or The cutter head (400) is a split piece including a plurality of components connected together.

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

22. The electrotome according to any one of claims 1-18, characterized in that, It further includes a rotation knob (1000); The proximal end of the outer sheath tube assembly (200) is connected to the first handle (100) through the rotation knob (1000). The rotation knob (1000) is relatively fixed axially on the first handle (100) with respect to the outer sheath tube assembly (200) and the first handle (100), and the rotation knob (1000) can rotate around the axis of the first handle (100) with respect to the outer sheath tube assembly (200) and the first handle (100). The conductive assembly (500) is movably disposed within the rotation knob (1000). The rotation knob (1000) is configured to drive the conductive assembly (500) and the cutter head (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 liquid injection channel (530a) after the cutter head (400) rotates into place.

Images