High-frequency incision knife for endoscope

Abstract

The utility model relates to a high frequency incision knife for endoscope, including work part and handle, work part includes sheath pipe, end cap, flow guide pipe, cutter head and traction assembly, end cap sets up in the distal end of sheath pipe, its is equipped with the cutter head channel and dosing channel who penetrates end cap along proximal end to distal end direction, cutter head channel proximal end section is tapered, the distal end opening of dosing channel is located on the distal end face of end cap, proximal end opening is located on the lateral wall of cutter head channel proximal end section and is communicated with this proximal end section;Flow guide pipe is equipped with in the proximal end side of end cap, its inside is equipped with the central channel who penetrates axially, and the helical rotational flow cavity that forms with cutter head channel intercommunication is formed between the inner wall of flow guide pipe and the inner wall of sheath pipe. This high frequency incision knife, not only has the dual function of tissue stripping and liquid medicine spraying, and through the synergistic cooperation of helical rotational flow cavity, cutter head channel and dosing channel, realizes the efficient atomization of liquid medicine, and the hemostatic effect is good when facing the mucosa stripping wound of larger area or irregular edge.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a high-frequency cutting knife for endoscopy. Background Technology

[0002] Endoscopic submucosal dissection (ESD) is a minimally invasive surgical technique widely used in the treatment of early-stage gastrointestinal tumors. Guided by an endoscope, this technique involves the complete removal of the diseased mucosa located in the submucosa. It can be used as both a diagnostic procedure and a radical treatment. The core operation of ESD relies on a high-frequency electrosurgical unit and its accompanying cutting instruments. After locating the lesion using the endoscope, the surgeon uses a high-frequency cutting instrument to precisely cut and dissect the mucosal layer, thereby separating the diseased tissue from the submucosa. This technique has been widely used in the treatment of early-stage tumors in the esophagus, stomach, and colon.

[0003] However, during or after the dissection, numerous bleeding points often appear in the surgical area. In such cases, the currently used high-frequency incision knife must be removed and replaced with a specialized hemostatic instrument. This procedure not only significantly prolongs the surgical time and increases the complexity of the surgeon's work, but may also increase the patient's risk of bleeding and affect postoperative recovery.

[0004] Currently, while some improved surgical instruments have attempted to integrate the cutting head and irrigation function into a single device, using a built-in cavity to spray water to flush bleeding points, water spraying alone is insufficient for hemostasis. Furthermore, the sprayed water is typically concentrated in a columnar shape, limiting its coverage and failing to evenly and comprehensively cover the wound surface. Therefore, even when replacing water with hemostatic medication, the medication cannot achieve widespread and even distribution, resulting in some bleeding points not being effectively covered. This is particularly problematic when dealing with large areas or irregularly edged mucosal dissection wounds, leading to insufficient hemostasis and poor predictability. Simultaneously, the columnar spray pattern can easily cause localized accumulation or excessive waste of medication, resulting in low actual utilization. This not only increases surgical costs but may also prolong the procedure time due to repeated re-spraying. Utility Model Content

[0005] The purpose of this invention is to provide a novel high-frequency cutting knife for endoscopy.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a high-frequency cutting knife for endoscopy, including a working part and a handle connected to the working part, wherein the working part includes:

[0008] A sheath, the proximal end of which is connected to the handle;

[0009] An end cap is disposed at the distal end of the sheath. The end cap has a blade channel and a drug delivery channel. The blade channel extends through the end cap from the proximal end to the distal end, and its proximal section is tapered. The distal opening of the drug delivery channel is located on the distal surface of the end cap, and its proximal opening is located on the side wall of the proximal section of the blade channel and communicates with the proximal section.

[0010] A flow guide tube is provided on the proximal side of the end cap. The flow guide tube has an axially penetrating central channel inside. Its outer wall forms a spiral swirling cavity with the inner wall of the sheath tube. The swirling cavity is connected to the cutter head channel.

[0011] The cutting head is axially slidably disposed within the cutting head channel and the central channel; and,

[0012] A traction assembly is disposed within the sheath, the distal end of which is connected to the cutter head and the proximal end of which is connected to the handle, and is configured to move axially under the action of the handle.

[0013] In some embodiments, the proximal section of the cutter head channel is frustum-shaped.

[0014] In some implementations, the cutter head channel is coaxial with the end cap.

[0015] In some embodiments, the outer periphery of the guide tube is provided with a helical groove, the groove wall of which, together with the inner wall of the sheath, defines the swirling cavity. Further, the distal end of the helical groove extends to the distal section of the guide tube, so that the swirling cavity communicates with the proximal opening of the cutter head channel; the proximal end of the helical groove extends to the proximal section of the guide tube, so that the swirling cavity communicates with the internal cavity of the sheath.

[0016] In some embodiments, the outer diameter of the distal section of the guide tube gradually decreases from near to far, and its minimum outer diameter is smaller than the maximum inner diameter of the proximal section of the cutter head channel.

[0017] In some embodiments, the outer diameter of the proximal section of the guide tube gradually increases from near to far.

[0018] In some embodiments, the swirling channel has at least two helical rings.

[0019] In some embodiments, the drug delivery channel extends axially.

[0020] In some embodiments, the inner contour shape of the distal segment of the cutter head channel is adapted to the distal outer shape of the cutter head.

[0021] In some embodiments, the outer periphery of the end cap is provided with radially protruding fins, which engage with the distal inner wall of the sheath.

[0022] In some embodiments, the handle includes a handle body, an operating part slidably connected to the handle body, a proximal end of the traction assembly connected to the operating part and a sealing ring provided between the traction assembly and the handle body, and the handle body is provided with an electrical plug and an injection connector.

[0023] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0024] The high-frequency cutting knife provided by this utility model not only has the dual functions of tissue dissection and drug spraying, but also achieves efficient drug atomization through the coordinated operation of the spiral vortex cavity, the blade channel, and the drug delivery channel. Specifically, after the drug enters the vortex cavity from the sheath, it forms a high-speed rotating liquid flow. This rotating liquid flow is then accelerated by the tapering section near the proximal end of the blade channel and sprayed out through the drug delivery channel, forming a fine jet. This jet undergoes strong shearing with the surrounding relatively stationary or low-speed air, overcoming the surface tension of the liquid under the action of aerodynamic resistance, causing the liquid flow to fluctuate and break, ultimately breaking into fine droplets, thereby achieving drug atomization. This allows the drug to be sprayed evenly and dispersed on the wound surface, resulting in excellent hemostatic effect when dealing with large-area or irregularly edged mucosal dissection wounds. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the high-frequency cutting blade provided in Example 1;

[0026] Figure 2 This is a schematic diagram of the structure of the high-frequency cutting knife provided in Example 1 when the injector is not shown;

[0027] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0028] Figure 4 A schematic diagram of the end cap provided in Example 1;

[0029] Figure 5 A cross-sectional view of the end cap provided in Embodiment 1;

[0030] Figure 6 A schematic diagram of the flow guide tube provided in Example 1;

[0031] Figure 7 A cross-sectional view of the guide tube provided in Example 1;

[0032] The components are as follows: 1. Working section; 11. Sheath; 12. End cap; 121. Blade channel; 1211. Distal section of blade channel; 1212. Proximal section of blade channel; 122. Drug delivery channel; 123. Wings; 13. Guide tube; 131. Central channel; 132. Spiral groove; 133. Proximal section of guide tube; 134. Distal section of guide tube; 14. Blade; 15. Connecting tube; 16. Cable; 17. Propulsion tube; 18. Protective tube;

[0033] 2. Handle; 21. Handle body; 22. Operating part; 23. Injection connector; 24. Electrode insert; 25. Injector; 26. Sealing ring. Detailed Implementation

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0035] In the description of the embodiments of this utility model, it should be understood that "distal end" refers to the end of the instrument or component away from the operator, and "proximal end" refers to the end of the instrument or component closer to the operator; "axial direction" refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the instrument or component; "inner" and "outer" are positions defined by distance relative to the center of the instrument or component, where "inner" is the position closer to the center of the instrument or component, and "outer" is the position away from the center of the instrument or component; "upper" and "lower" refer to the orientation of the instrument in its actual use or working state. The above description of directional terms is only for the convenience of describing the embodiments of the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The foregoing disclosure provides many different implementations or examples for carrying out different structures of the embodiments of this utility model. To simplify the disclosure of the embodiments of this utility model, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the embodiments of this utility model. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of this utility model; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0039] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0040] Example 1

[0041] A high-frequency cutting blade for endoscopy, such as Figures 1 to 7 As shown, it includes a working part 1 and a handle 2 connected to the working part 1. The handle 2 is provided with an electrical plug 24 and a liquid injection connector 23.

[0042] The working part 1 includes a sheath 11, an end cap 12, a guide tube 13, a blade 14, and a traction assembly. The proximal end of the sheath 11 is connected to the handle 2. The end cap 12 is located at the distal end of the sheath 11 and has a blade channel 121 and a drug delivery channel 122. The blade channel 121 extends through the end cap 12 from proximal to distal end, and its proximal section (the proximal section 1212 of the blade channel) is tapered. The distal opening of the drug delivery channel 122 is located on the distal surface of the end cap 12, and its proximal opening is located on the side wall of the proximal section of the blade channel 121 and communicates with the proximal section. The guide tube 13 is located on the proximal side of the end cap 12 and has an axially penetrating central channel 131 inside. A spiral swirling cavity is formed between the outer wall of the guide tube 13 and the inner wall of the sheath 11, and this swirling cavity communicates with the blade channel 121. The cutter head 14 is axially slidably disposed within the cutter head channel 121 and the central channel 131. The distal end of the traction assembly is connected to the cutter head 14, and the proximal end is connected to the handle 2. Driven by the handle 2, the traction assembly moves axially along the sheath 11.

[0043] During use, the working part 1 is guided to the target position through the endoscope. The traction component is controlled by the operating handle 2 to move the cutter head 14 axially distally, causing the cutter head 14 to extend beyond the end cap 12, thereby peeling off the target tissue. The operator can adjust the length of the cutter head 14 extending beyond the end cap 12 in real time according to the actual peeling needs using the operating handle 2.

[0044] When bleeding occurs in the surgical area and hemostasis is required, the operating handle 2 moves the traction assembly, along with the blade 14, axially towards the proximal end, retracting the blade 14 into the end cap 12. Subsequently, hemostatic solution is injected into the sheath 11 under pressure through the injection connector 23. The solution first enters the vortex cavity, where it is accelerated and rotated to form a high-speed vortex; then it flows through the tapered section proximal to the blade channel 121, undergoing secondary acceleration and focusing (the reduction in the flow cross-sectional area increases the flow rate of the solution, and the tapered tube wall constricts the flow, forming a concentrated and high-speed core jet); finally, it is ejected at high speed through the drug delivery channel 122, forming a fine jet. This jet undergoes strong shearing action with the surrounding relatively stationary or low-speed air, overcoming the surface tension of the liquid under the influence of aerodynamic resistance, causing the liquid flow to fluctuate and break up, ultimately breaking into a large number of fine droplets, achieving efficient atomization of the solution, thus dispersing it onto the wound surface.

[0045] During this process, the synergistic work of the swirling cavity, the tapered structure of the blade channel 121, and the drug delivery channel 122 not only significantly improves the outlet speed and rotation intensity of the drug solution, but also ensures that the drug solution can be atomized into fine droplets through multi-stage effects of acceleration, rotation, aggregation, and shearing, thereby enabling it to cover the wound more widely and evenly, improving the hemostatic effect while reducing the amount of drug solution used.

[0046] As a preferred option, such as Figure 3 , Figure 5 As shown, the proximal section 1212 of the blade channel is frustum-shaped to achieve a more efficient and uniform drug atomization effect. In this embodiment, the blade channel 121 and the end cap 12 are coaxial, and the drug delivery channel 122 is located on the side of the blade channel 121 and extends axially. The inner contour shape of the distal section 1211 of the blade channel is adapted to the distal outer shape of the blade 14 so that the blade 14 can form a blockage in the distal section 1211 of the blade channel, thereby allowing the drug to be sprayed out from the drug delivery channel 122 when the drug is injected.

[0047] like Figure 4 and Figure 5As shown, the outer periphery of the end cap 12 has radially protruding wings 123, which snap onto the distal inner wall of the sheath 11. This design serves two purposes: first, it ensures the end cap 12 is stably fixed to the distal end of the sheath 11, preventing accidental displacement or detachment during operation and guaranteeing the positional accuracy and reliability of motion transmission between components; second, the snap-fit ​​connection eliminates the need for threads or additional fastening devices, facilitating rapid disassembly and reassembly during surgery, and aiding in instrument cleaning, disinfection, and component replacement, thus improving surgical efficiency and instrument maintainability. The end cap 12 can be made of flexible materials such as rubber, and combined with the snap-fit ​​design of the wings 123, it achieves a reliable connection while retaining the material's flexibility. This not only reduces the risk of trauma when in contact with tissue but also enhances the compliance and safety of instruments when passing through narrow anatomical areas.

[0048] The swirling channel has at least two helical rings, preferably three to six. Multiple helical rings significantly increase the rotation intensity and flow path of the liquid, forming a more stable and intense high-speed swirling flow. Specifically, such as... Figure 6 and Figure 7 As shown, this structure is achieved by machining a spiral groove 132 on the outer periphery of the guide tube 13. The groove wall of the spiral groove 132 and the inner wall of the sheath 11 together define the swirling cavity. Further, the distal end of the spiral groove 132 extends to the distal section 134 of the guide tube, so that the swirling cavity communicates with the proximal opening of the cutter head channel 121; the proximal end of the spiral groove 132 extends to the proximal section 133 of the guide tube, so that the swirling cavity communicates with the internal cavity of the sheath 11. Preferably, the outer diameter of the distal section 134 of the guide tube gradually decreases from near to far, and its minimum outer diameter is smaller than the maximum inner diameter of the proximal section 1212 of the cutter head channel. The outer diameter of the proximal section 133 of the guide tube gradually increases from near to far. The proximal expansion structure of the guide tube 13 helps to smoothly guide the liquid from the sheath tube 11 into the spiral groove 132, reducing flow resistance and turbulence; the distal contraction of the guide tube 13 forms a smooth transition with the cutter head channel 121, avoiding eddies or pressure loss caused by sudden changes in cross-section, and ensuring that the fluid kinetic energy is efficiently transferred to the injection terminal.

[0049] The traction assembly includes a cable 16, a connecting tube 15 for fixing the cable 16 to the cutter head 14, and a booster tube 17 connected to the proximal end of the cable 16, the booster tube 17 being connected to the handle 2.

[0050] The handle 2 can be referenced from existing technologies in the art. As an example, in this embodiment, the handle 2 includes a handle body 21 and an operating part 22 slidably connected to the handle body 21. The proximal end of the booster tube 17 is connected to the operating part 22, and a sealing ring 26 is provided between it and the handle body 21. The handle body 21 is provided with an electrical plug 24 and a liquid injection connector 23, with a liquid injector 25 detachably connected to the liquid injection connector 23. The proximal end of the sheath tube 11 is connected to the handle body 21 via a protective tube 18.

[0051] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-frequency cutting knife for endoscopy, comprising a working part (1) and a handle (2) connected to said working part (1), characterized in that, The working unit (1) includes: A sheath (11), the proximal end of which is connected to the handle (2); An end cap (12) is disposed at the distal end of the sheath (11). The end cap (12) is provided with a blade channel (121) and a drug delivery channel (122). The blade channel (121) extends through the end cap (12) from the proximal end to the distal end, and its proximal section is tapered. The distal opening of the drug delivery channel (122) is located on the distal surface of the end cap (12), and its proximal opening is located on the side wall of the proximal section of the blade channel (121) and communicates with the proximal section. A guide tube (13) is provided on the proximal side of the end cap (12). The guide tube (13) has an axially penetrating central channel (131) inside. Its outer wall forms a spiral swirling cavity with the inner wall of the sheath tube (11). The swirling cavity is connected to the cutter head channel (121). The cutting head (14) is axially slidably disposed within the cutting head channel (121) and the central channel (131); and, A traction assembly is disposed within the sheath (11), the distal end of which is connected to the cutter head (14) and the proximal end to the handle (2), and is configured to move axially under the action of the handle (2).

2. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The proximal section of the cutter head channel (121) is frustum-shaped; And / or, the cutter head channel (121) is coaxial with the end cap (12).

3. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The outer periphery of the guide tube (13) is provided with a spiral groove (132), and the groove wall of the spiral groove (132) and the inner wall of the sheath tube (11) together define the swirling cavity.

4. The high-frequency cutting blade for endoscopy according to claim 3, characterized in that, The distal end of the spiral groove (132) extends to the distal section of the guide tube (13) so that the swirling cavity is connected to the proximal opening of the cutter head channel (121). The proximal end of the spiral groove (132) extends to the proximal section of the guide tube (13) so that the swirling cavity communicates with the internal cavity of the sheath tube (11).

5. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The outer diameter of the distal section of the guide tube (13) gradually decreases from near to far, and its minimum outer diameter is smaller than the maximum inner diameter of the proximal section of the cutter head channel (121). And / or, the outer diameter of the proximal section of the guide tube (13) gradually increases from near to far.

6. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The swirling cavity has at least two helical rings.

7. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The drug delivery channel (122) extends axially.

8. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The inner contour shape of the distal segment of the cutter head channel (121) is adapted to the distal outer shape of the cutter head (14).

9. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The outer periphery of the end cap (12) is provided with radially protruding wing (123), which is engaged with the distal inner wall of the sheath (11).

10. The high-frequency cutting blade for endoscopy according to claim 1, characterized in that, The handle (2) includes a handle body (21) and an operating part (22) slidably connected to the handle body (21). The proximal end of the traction component is connected to the operating part (22) and a sealing ring (26) is provided between it and the handle body (21). The handle body (21) is provided with an electrical plug (24) and an injection connector (23).

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