Necrosis tissue removing clamp under choledochoscope

Abstract

The invention provides a necrotic tissue removing clamp under a choledochoscope, which relates to the technical field of medical instruments and comprises a first removing tube, a second removing tube and a plurality of barbs. The first clearing pipe comprises a first pipe body and a plurality of clearing elastic pieces, and the clearing elastic pieces are connected to one end of the first pipe body. The second cleaning pipe is coaxially and movably arranged in the first cleaning pipe in a penetrating mode. The barbs are arranged on the clearing elastic pieces and the second clearing pipe respectively. When the first clearing pipe is located in the instrument channel, the clearing elastic pieces are restrained by the instrument channel in the radial direction to be in a folded state. And when the first clearing pipe extends out of the end part of the instrument channel, the plurality of clearing elastic sheets are released from the radial constraint and are automatically and radially expanded. According to the invention, the cleaning efficiency can be effectively improved, the one-time cleaning success rate can be effectively improved, the problems of slippage and untight closing are solved, in addition, the device also has the advantage of simplicity and convenience in operation, and can be effectively adapted to a minimally invasive environment.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a necrotic tissue removal clamp for choledochoscopy. Background Art

[0002] Among the existing related technologies, choledochoscopic necrotic tissue removal technology is mainly used for minimally invasive treatment of extensive encapsulated necrosis (WON) after pancreatitis or residual infected necrotic tissue after biliary surgery. At present, it is generally based on an endoscopic step-by-step treatment strategy, establishing an operating channel through a natural cavity or percutaneous pathway to remove necrotic tissue and drain the infected foci under direct vision.

[0003] However, when there is adhesion tissue in the necrotic tissue to be removed, the existing biopsy forceps have the following problems: First, the removal efficiency is relatively low. Biopsy forceps can only grasp a piece of tissue at a time, and complete removal requires repeated entry and exit of the instrument channel of the choledochoscope, which is not only time-consuming and inefficient, but also increases pain and the risk of perforation.

[0004] Second, the success rate of first-pass removal is relatively low. Because adhesion tissue is smooth and adheres to other tissues, existing biopsy forceps are prone to slipping when grasping adhesion tissue. Furthermore, because the clamping environment is mucus-filled, the jaws may become covered with mucus, resulting in a loose closure of the biopsy forceps. This reduces the likelihood of successful first-pass removal. Summary of the Invention

[0005] In order to solve the problems in the related art, the present invention provides a necrotic tissue removal clip under choledochoscopy.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: Choledochoscopy necrotic tissue removal clips, including: a first clearing tube, configured to be movably disposed in the instrument channel of the choledochoscope, the first clearing tube comprising a first tube body and a plurality of clearing shrapnel, wherein the plurality of clearing shrapnel are connected to one end of the first tube body at intervals along the circumference of the first tube body; a second cleaning pipe, coaxially and movably disposed inside the first cleaning pipe; A plurality of barbs, respectively provided on the plurality of cleaning shrapnels and the second cleaning tube, and the barbs are used to hook necrotic tissue; When the first cleaning tube is located in the instrument channel, the plurality of cleaning shrapnel are radially constrained by the instrument channel and are in a retracted state; when the first cleaning tube extends out of the end of the instrument channel, the radial constraints of the plurality of cleaning shrapnel are released and the plurality of cleaning shrapnel are automatically radially expanded.

[0007] Optionally, the cleaning spring includes an interconnected mounting section and an extension section, an end of the mounting section away from the extension section is connected to the end of the first tube body, the angle between the mounting section and the extension section is set to an obtuse angle, and in the axial direction of the first cleaning tube, the length dimension of the mounting section is smaller than the length dimension of the extension section.

[0008] Optionally, the first cleaning tube further includes a plurality of operating cables arranged in one-to-one correspondence with the plurality of cleaning springs, one end of the operating cable being connected to the end of the extension section away from the mounting section, and the other end of the operating cable passing through the first tube body and extending out of the other end of the first tube body; Wherein, an operating through hole for the operating rope to pass through is opened on the installation section, and the barb is arranged on a side of the extension section close to the second cleaning pipe.

[0009] Optionally, the first tube body includes a first section, a second section, and a third section coaxially connected in sequence, an end of the first section away from the second section is connected to the cleaning spring, and a radial dimension of the second section is smaller than that of the first section and the third section; The first cleaning tube further includes an operating ring, which is axially movably sleeved on the second section, and one end of the operating cable away from the cleaning spring is connected to the operating ring.

[0010] Optionally, when the clearing spring is in a retracted state, the operating cable is in a tensioned state and the operating ring is in contact with the third section; when the clearing spring is radially expanded, the operating cable is in a tensioned state and the operating ring is in contact with the first section.

[0011] Optionally, the expansion section and the installation section are both formed into an arc-shaped cross-section, and the arc-shaped cross-section is bent toward the first cleaning pipe.

[0012] Optionally, the second clearing tube includes a second tube body and a traveling cone head section connected to each other, the radial size of the traveling cone head section gradually decreases in the direction from the second tube body to the traveling cone head section, and one end of the second tube body away from the traveling cone head section extends out of the first tube body.

[0013] Optionally, the traveling cone head section is formed into one of the following structures: a conical structure, a pyramidal structure, or a frustum structure.

[0014] Optionally, a mounting through hole for the second pipe body to pass through is formed in the first pipe body, and a radial dimension of the mounting through hole is larger than a radial dimension of the second pipe body.

[0015] Optionally, the second clearing tube further includes a blocking section, which is coaxially connected to an end of the second tube body away from the traveling cone head section, and a radial dimension of the blocking section is larger than a radial dimension of the mounting through hole.

[0016] Beneficial effects: 1. Through the above technical solution, first, the present invention can significantly increase the amount of single-time removal and solve the problem of low efficiency. Specifically, multiple unfolded cleaning shrapnel form a "multi-claw" structure, the area covered and the number of points that can contact tissue are much larger than the single jaw of the traditional biopsy forceps. When this "multi-claw" structure is unfolded, it can simultaneously contact and attempt to grab necrotic tissue in a larger range. Compared with the biopsy forceps in the existing related technology, this design can theoretically capture more necrotic tissue fragments in a single operation. In this way, the number of times the instrument channel needs to be repeatedly entered and exited can be directly reduced, thereby shortening the operation time, improving the cleaning efficiency, and also indirectly reducing the patient pain and perforation risk caused by repeated operations.

[0017] Secondly, the present invention can also effectively enhance the grip on necrotic tissue, improve the success rate of first-pass removal, and address the issues of slippage and lax closure. Specifically, first, to prevent slippage, when the removal shrapnel deploys and contacts tissue, the barbs on it can penetrate or hook the target necrotic tissue. This mechanical "hooking" action is particularly effective in preventing tissue slippage compared to the simple gripping friction of traditional biopsy forceps. Similarly, the barbs on the second removal tube provide additional gripping points when the second removal tube moves or contacts tissue. Second, to overcome mucus environments, the barbs of the present invention provide a penetrating gripping effect, unlike traditional jaw gripping, which relies heavily on friction between the jaws (friction is significantly reduced in mucus environments). Even if the removal shrapnel or the second removal tube is covered with mucus, as long as the barbs can penetrate the tissue, they can provide reliable fixation, effectively avoiding the problem of "lax closure" caused by mucus and the inability to effectively grasp tissue. In addition, the multiple cleaning shrapnel (all provided with barbs) of the present invention plus the second cleaning tube (provided with barbs) can form a multi-point anchoring system. Compared with the single jaws in the prior art, the present invention can grasp necrotic tissue more firmly and is less likely to slip, which can significantly increase the possibility of successfully removing the target tissue with one clamping (hooking).

[0018] Third, the present invention offers the advantage of ease of operation and is effectively adaptable to minimally invasive environments. Specifically, the deployment state of the present invention's clearing clip switches based on its position within the instrument channel (constrained and retracted within the channel, automatically deployed when extended out of the channel). This is a passive, automatic mechanical process. Thus, the operator simply advances or retracts (or rotates) the entire clearing clip within the instrument channel, as with traditional instruments. No additional, complex, specialized mechanism is required to control the opening and closing of the clip. This effectively simplifies the clearing operation, making it easier for the surgeon to control it in the space-constrained environment of a choledochoscope, and meeting the design requirements of minimally invasive surgical instruments.

[0019] Fourth, the present invention effectively enhances the cleaning effect through the coordination of the first and second cleaning tubes. Specifically, the deployed multiple barbed cleaning shrapnel is responsible for capturing and initially securing a larger area of ​​necrotic tissue. Simultaneously, the barbed second cleaning tube can move independently within the first cleaning tube, penetrating into the center of the initially secured tissue area or performing more precise capture and fixation of specific adhesion points. In this way, the two work together to achieve both large-scale cleaning (multiple shrapnel deployment) and precise fixation (second cleaning tube intervention), while also providing a strong overall gripping force through the widespread barbs, jointly overcoming the challenges of adherent tissue.

[0020] 2. Other beneficial effects or advantages of the present invention will be described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] in: Figure 1 1 is a schematic diagram of the three-dimensional structure of a necrotic tissue removal clip for choledochoscopy provided by an exemplary embodiment of the present invention, wherein the removal shrapnel is retracted into the instrument channel; Figure 2 1 is a schematic diagram of the three-dimensional structure of a necrotic tissue removal clip for choledochoscopy provided by an exemplary embodiment of the present invention, wherein the removal shrapnel extends out of the instrument channel and is deployed; Figure 3 is a schematic diagram of the three-dimensional structure of a first cleaning tube provided by an exemplary embodiment of the present invention; Figure 4 yes Figure 3 A magnified schematic diagram of the local structure at center A; Figure 5 yes Figure 3 A magnified schematic diagram of the local structure at point B in the middle; Figure 6 It is a schematic diagram of the three-dimensional structure of a second cleaning tube provided by an exemplary embodiment of the present invention.

[0023] Description of the reference numerals in the accompanying drawings: 100-necrotic tissue removal clip for choledochoscopy; 200-instrument channel; 1-first removal tube; 11-first tube body; 111-first section; 112-second section; 113-third section; 114-installation through hole; 12-removal shrapnel; 121-installation section; 1211-operation through hole; 122-extension section; 13-operation cable; 14-operation ring; 2-second removal tube; 21-second tube body; 22-advanced cone head section; 23-sealing section; 3-barb. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0026] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0027] like Figures 1 to 6 As shown, the present invention provides a necrotic tissue removal clip 100 for choledochoscopes, comprising a first removal tube 1, a second removal tube 2, and a plurality of barbs 3. The first removal tube 1 is configured to be movably inserted into the instrument channel 200 of a choledochoscope. The first removal tube 1 comprises a first tube body 11 and a plurality of removal shrapnel 12, which are connected to one end of the first tube body 11 at intervals along the circumference of the first tube body 11. The second removal tube 2 is coaxially and movably inserted into the first removal tube 1. The plurality of barbs 3 are respectively provided on the plurality of removal shrapnel 12 and the second removal tube 2, and the barbs 3 are configured to hook necrotic tissue.

[0028] When the first cleaning tube 1 is located in the instrument channel 200, the plurality of cleaning springs 12 are radially constrained by the instrument channel 200 and are in a retracted state; when the first cleaning tube 1 extends out of the end of the instrument channel 200, the radial constraints of the plurality of cleaning springs 12 are released and they automatically expand radially.

[0029] To facilitate understanding by relevant technical personnel, the working process / working principle of the above technical solution is first explained below.

[0030] When necrotic tissue removal is required, the necrotic tissue removal clip 100 under the choledochoscopic method of the present invention can be inserted into the location of the necrotic tissue (such as the necrotic tissue removal position) through the instrument channel 200 of the choledochoscopic method. Figure 1 As shown), the first cleaning tube 1 is then pushed forward so that the end of the first cleaning tube 1 extends out of the instrument channel 200. At this time, the radial constraints of the plurality of cleaning shrapnel 12 are released and the shrapnel 12 are automatically expanded radially (as shown). Figure 2 As shown), the first tube body 11 is then used to control the plurality of cleaning shrapnel 12 to continuously move and expand outside the necrotic tissue to be cleared, and then the second cleaning tube 2 is pushed forward so that the second cleaning tube 2 is inserted into the necrotic tissue to be cleared, so that the barbs 3 outside the second cleaning tube 2 can hook the necrotic tissue, and then the first cleaning tube 1 and the second cleaning tube 2 can be retracted. When the cleaning shrapnel 12 is retracted to the end of the instrument channel 200, it will be radially constrained by the inner wall of the instrument channel 200 and gradually switch to a retracted state. In this way, the first cleaning tube 1 and the second cleaning tube 2 and the plurality of barbs 3 will reliably restrict the necrotic tissue. As the first cleaning tube 1 and the second cleaning tube 2 continue to retreat, the restricted necrotic tissue can be clamped out with the help of the instrument channel 200.

[0031] During this process, in order to increase the possibility of the barbs 3 hooking the necrotic tissue, when the cleaning shrapnel 12 is unfolded outside the necrotic tissue, the first tube body 11 can be used to operate several cleaning shrapnel 12 to rotate so that the necrotic tissue can be hooked by the barbs 3 on the cleaning shrapnel 12; at the same time, when the second cleaning tube 2 is inserted into the necrotic tissue, the second cleaning tube 2 can be inserted while rotating (or rotated after insertion) so that the necrotic tissue can be hooked by the barbs 3 on the second cleaning tube 2.

[0032] Through the above technical solution, first, the present invention can significantly increase the amount of single-time cleaning and solve the problem of low efficiency. Specifically, a plurality of unfolded cleaning shrapnel 12 form a "multi-claw" structure, the area covered and the number of points that can contact tissue are much larger than the single jaw of the traditional biopsy forceps. When this "multi-claw" structure is unfolded, it can simultaneously contact and attempt to grab necrotic tissue in a larger range. Compared with the biopsy forceps in the existing related technology, this design can theoretically capture more necrotic tissue fragments in a single operation. In this way, the number of times the instrument channel 200 needs to be repeatedly entered and exited can be directly reduced, thereby shortening the operation time, improving the cleaning efficiency, and also indirectly reducing the patient pain and perforation risk caused by repeated operations.

[0033] Secondly, the present invention can also effectively enhance the gripping force on necrotic tissue, improve the success rate of one-shot removal, and address the problems of slippage and lax closure. Specifically, first, to prevent slippage, when the removal shrapnel 12 is deployed and contacts tissue, the barbs 3 thereon can penetrate or hook the target necrotic tissue. This mechanical "hooking" action is particularly effective in preventing tissue slippage compared to the simple gripping friction of traditional biopsy forceps. Similarly, the barbs 3 on the second removal tube 2 also provide additional gripping points when it moves or contacts tissue. Second, to overcome mucus environments, the hooking action provided by the barbs 3 of the present invention is penetrating, unlike traditional jaw gripping, which relies heavily on friction between the jaws (friction is significantly reduced in mucus environments). Even if the removal shrapnel 12 or the second removal tube 2 is covered with mucus, as long as the barbs 3 can penetrate the tissue, they can provide reliable fixing force, effectively avoiding the problem of "lax closure" caused by mucus and the inability to effectively grasp tissue. In addition, the multiple cleaning shrapnel 12 (all provided with barbs 3) of the present invention plus the second cleaning tube 2 (provided with barbs 3) can form a multi-point anchoring system. Compared with the single jaws in the prior art, the present invention can grasp necrotic tissue more firmly, is less likely to slip, and can significantly increase the possibility of successfully removing the target tissue with one clamping (hooking).

[0034] Third, the present invention offers the advantage of ease of operation and is effectively adaptable to minimally invasive environments. Specifically, the deployment state of the clearing clip 12 of the present invention switches based on its position within the instrument channel 200 (constrained and retracted within the channel, automatically deployed when extended out of the channel). This is a passive, automatic mechanical process. Thus, the operator simply advances or retracts (or rotates) the entire clearing clip within the instrument channel 200, as with traditional instruments. No additional, complex, specialized mechanism is required to control the opening and closing of the clip. This effectively simplifies the clearing operation, making it easier for the surgeon to control the operation in the space-constrained environment of a choledochoscope, and meeting the design requirements of minimally invasive surgical instruments.

[0035] Fourth, the present invention effectively enhances the cleaning effect through the coordination of the first cleaning tube 1 and the second cleaning tube 2. Specifically, the deployed multiple cleaning shrapnel 12 with barbs 3 is responsible for capturing and initially securing a large area of ​​necrotic tissue. Simultaneously, the second cleaning tube 2 with barbs 3 can move independently within the first cleaning tube 1, penetrating into the center of the initially secured tissue area or performing more precise capture and securing of specific adhesion points. In this way, the two work together to achieve both large-scale cleaning (multiple shrapnel deployment) and precise securing (second cleaning tube 2 intervention), while also providing a strong overall gripping force through the widespread barbs 3, jointly overcoming the challenges of adherent tissue.

[0036] In one embodiment of the present invention, Figure 4 As shown, the cleaning spring piece 12 of the present invention includes a mounting section 121 and an extension section 122 connected to each other. The end of the mounting section 121 away from the extension section 122 is connected to the end of the first tube body 11. The angle between the mounting section 121 and the extension section 122 is set to an obtuse angle. In the axial direction of the first cleaning tube 1, the length of the mounting section 121 is smaller than the length of the extension section 122.

[0037] In this embodiment, first, the thus configured clearing shrapnel 12 has a larger working range and contact area with necrotic tissue. Specifically, the obtuse angle design allows the extension section 122 to open outward at a larger angle relative to the mounting section 121 when the clearing shrapnel 12 is released from its restraint. Combined with the longer extension section 122, the radial coverage distance and swept area of ​​a single shrapnel after deployment are significantly increased. When multiple such shrapnel are deployed circumferentially, the resulting "multi-claw" structure has an overall working diameter and reach far greater than a simple straight-arm or acute-angle design. Second, the barbs 3 are disposed on the extension section 122. The longer extension section 122 means a longer effective working length supporting the barbs 3, allowing for more barbs 3 to be distributed and for tissue to be captured over a wider range. The larger deployment angle allows the barbs 3 to cover a wider radial area, making it easier to contact necrotic tissue fragments at different locations, particularly those located off the central axis. This further increases the probability and quantity of tissue captured in a single operation, further enhancing clearance efficiency.

[0038] Second, this arrangement of the clearing clip 12 provides enhanced structural rigidity and gripping stability. Specifically, the segmented structural design (especially with the obtuse angle) avoids the formation of sharp stress concentration zones at the connection point (root). The obtuse angle inherently enhances force transmission. When the extension segment 122 encounters tissue resistance or the barbs 3 hook into tissue, generating tension, the force is more smoothly transferred to the mounting segment 121 and the tube body through the obtuse angle transition, reducing the risk of deformation or fracture caused by localized excessive stress. Secondly, the shorter mounting segment 121 acts as a supporting "short arm," providing a stable foundation for the longer extension segment 122. The obtuse angle connection point acts as a natural "reinforcement rib," enhancing the clearing clip 12's ability to resist lateral bending (forces perpendicular to the deployed plane). This ensures that the clearing clip 12 maintains its deployed stability when hooking and pulling tissue, preventing unintended bending or twisting. This effectively maintains the effective working position and gripping force of the barbs 3, improving controllability and success rate of the operation.

[0039] Third, this configuration of the clearing spring 12 enables efficient and reliable deployment and retraction. Specifically, first, after being released from its constraints, the longer extension segment 122's mass is distributed further from the rotation point (connection). Combined with the obtuse angle design, this provides a greater deployment torque. This allows the clearing spring 12 to more quickly and reliably reach its predetermined maximum deployment state after being freed from the constraints of the instrument channel 200, ensuring effective deployment even in mucus environments. Second, when the instrument channel 200 needs to be withdrawn, the shorter mounting segment 121 preferentially contacts the channel entrance edge. The obtuse angle design allows the extension segment 122 to smoothly fold inward along the direction of the mounting segment 121 when subjected to radial pressure from the channel wall, preventing jamming or the need for excessive retraction force. The shorter mounting segment 121 than the extension segment 122 also means that during the retraction process, the bending deformation that needs to be overcome primarily occurs near the connection point, reducing overall retraction resistance and protecting the spring structure. Furthermore, in the collapsed state, the shorter mounting section 121 and the obtuse angle design help the expansion section 122 to fit more closely around or parallel to the tube body, forming a more compact collapsed envelope, facilitating smooth movement within the narrow instrument channel 200 .

[0040] In one embodiment of the present invention, Figures 1 to 5 As shown, the first cleaning tube 1 of the present invention further includes a plurality of operating cables 13 arranged in a one-to-one correspondence with the plurality of cleaning springs 12. One end of the operating cable 13 is connected to the end of the extension section 122 away from the mounting section 121, and the other end of the operating cable 13 is passed through the first tube body 11 and extends out of the other end of the first tube body 11; wherein, the mounting section 121 is provided with an operating through hole 1211 for the operating cable 13 to pass through, and the barb 3 is provided on the side of the extension section 122 close to the second cleaning tube 2.

[0041] In this embodiment, first, the thus configured operating cable 13 enables active, controllable, and independent retraction of the clearing shrapnel 12. Specifically, whereas the deployment of the clearing shrapnel 12 in the aforementioned technical solution was passive (automatically deployed upon release of constraints) and its retraction was also passive (constrained entry into the channel). In this embodiment, the operating cable 13 provides the physician with the ability to actively control the state of the clearing shrapnel 12. By pulling the operating cable 13 proximally, the physician directly pulls the distal end of the extension segment 122 to control the state of the clearing shrapnel 12. Second, because the operating cable 13 is connected to the distal end of the extension segment 122, pulling the operating cable 13 can most effectively drive the entire extension segment 122 to retract toward the central axis, achieving active retraction of the shrapnel. This is more reliable, thorough, and rapid than the passive retraction in the aforementioned technical solution, which relies solely on the (potentially uneven or incomplete) constraints of the instrument channel 200 wall. Each spring clip has an independent operating cable 13. The surgeon can selectively pull one or more of these cables 13 to independently control the contraction of the corresponding spring clip. This is crucial when treating irregularly shaped necrotic lesions or when avoiding specific tissues (such as blood vessels), providing exceptional operational flexibility. Furthermore, when the barbs 3 have hooked tissue, actively pulling the operating cables 13 to contract the spring clip applies a controlled, centrally directed pulling force to the hooked tissue, more effectively detaching or lifting the entire piece of adhesion, significantly enhancing the removal of stubborn adhesions. This active force application process, unattainable with passive structures, is a significant advantage.

[0042] Second, it can optimize the working direction and effectiveness of the barbs 3. Specifically, first, when the shrapnel is deployed, the barbs 3 are located on the inner side of the expansion section 122 (toward the central axis / second clearing tube 2). When the shrapnel retracts toward the center (whether passively entering the channel or actively pulling the operating cable 13), these barbs 3 naturally face and penetrate / hook the tissue within the enclosed area, perfectly matching the required direction of the "hooking" function. Second, the barbs 3 are located on the inner side. When the instrument moves within the instrument channel 200 (with the shrapnel retracted) or moves in a non-operating state within the body cavity, the barbs 3 are wrapped inside the shrapnel structure or toward the center, greatly reducing the risk of scratching the bile duct wall, the inner wall of the instrument channel 200, or non-target tissue, thereby improving safety. In addition, the barbs 3 face the center, forming an internal and external clamping force with the barbs 3 on the second cleaning tube 2 (also facing the external tissue). When the multiple shrapnel shrinks, the inner barbs 3 and the outer barbs 3 of the second cleaning tube 2 work together to more firmly "clamp" the target necrotic tissue and prevent it from slipping from the center, thereby significantly improving the overall gripping force and success rate.

[0043] Third, in this embodiment, the operating cable 13 is passed through the operating through hole 1211. In this way, the operating through hole 1211 can fix the passage path of the operating cable 13 on the mounting section 121, thereby preventing it from getting entangled or rubbing against other components when clearing the shrapnel 12, ensuring smooth and reliable operation and extending the service life.

[0044] Fourth, the configuration of the operating cables 13 improves overall safety and controllability of the procedure. Specifically, first, it allows the physician to instantly and proactively retract the clearing shrapnel 12 in a dangerous area (such as a blood vessel or the wall of a critical bile duct) to prevent damage. Second, by adjusting the force and speed of the operating cables 13, the physician can precisely control the tension on the entangled tissue, avoiding excessive tissue tearing or bleeding caused by sudden passive retraction (such as rapid instrument withdrawal). Furthermore, when rapid instrument withdrawal is necessary, the physician can proactively and synchronously pull all operating cables 13 to ensure that all shrapnel are fully and quickly retracted to their minimum size, allowing for smooth withdrawal of the instrument channel 200, mitigating risks in emergency situations.

[0045] In one embodiment of the present invention, Figure 5 As shown, the first tube body 11 of the present invention includes a first section 111, a second section 112 and a third section 113 that are coaxially connected in sequence. The end of the first section 111 away from the second section 112 is connected to the cleaning spring 12, and the radial dimension of the second section 112 is smaller than the radial dimensions of the first section 111 and the third section 113; the first cleaning tube 1 also includes an operating ring 14, which is axially movably mounted on the second section 112, and the end of the operating cable 13 away from the cleaning spring 12 is connected to the operating ring 14.

[0046] In this embodiment, the first tube body 11 and the operating ring 14 are configured as described above, and the following technical effects can be achieved: First, centralized control simplifies operation. This embodiment secures the proximal ends (the ends closest to the surgeon) of multiple operating cables 13 to a single operating ring 14. The surgeon simply moves the operating ring 14 axially to synchronously control the contraction of all springs, completely eliminating the tedious operation of pulling multiple operating cables 13 individually and significantly improving operational convenience (while also ensuring that the surgeon still has space to operate a single operating cable 13).

[0047] Second, it enhances synchronization and stability. In this embodiment, the operating ring 14 is mounted on the radially smaller second section 112 (the narrow neck section), forming a precise guide track. The axial movement of the operating ring 14 is strictly limited to the narrow neck section path, preventing radial deviation. This ensures uniform force and consistent displacement of all operating cables 13, allowing for synchronized contraction and release of multiple springs and highly coordinated movement.

[0048] Third, it optimizes force transmission efficiency. The narrow neck section (i.e., second section 112) provides a low-friction sliding surface for the operating ring 14. This reduces resistance to movement and allows the physician to apply force more easily. The rigid structure of the operating ring 14 evenly distributes tension to all operating cables 13, preventing uneven force distribution on individual cables and the resulting asynchronous movement of the springs.

[0049] Fourth, the structure is compact and reliable. The compact design of the operating ring 14 nestled within the narrow neck eliminates the need for a complex transmission mechanism, reducing potential failure points. The first and third segments 111, 113 at either end of the narrow neck feature larger radial dimensions, creating a mechanical stop to prevent the operating ring 14 from falling out.

[0050] In one embodiment of the present invention, when the clearing shrapnel 12 is in a retracted state, the operating cable 13 is in a tensioned state and the operating ring 14 is in contact with the third section 113; when the clearing shrapnel 12 is radially expanded, the operating cable 13 is in a tensioned state and the operating ring 14 is in contact with the first section 111.

[0051] In this embodiment, first, the arrangement of the clearing spring 12 provides clear physical positioning feedback. Specifically, when the operating ring 14 abuts the third segment 113, the spring is 100% retracted (i.e., safely retractable), while when the operating ring 14 abuts the first segment 111, the spring is 100% fully extended (i.e., at its maximum operational state). This allows the physician to accurately determine the state of the spring by tactilely and visually sensing the position of the operating ring 14.

[0052] Second, the arrangement of the clearing spring 12 eliminates operational uncertainty. Specifically, the extreme position abutment design automatically limits the travel of the operating ring 14, preventing the spring from over-contraction (structural damage) or over-expansion (deformation failure) due to excessive pulling, ensuring that the spring operates within a safe mechanical range.

[0053] Third, the arrangement of the spring clip clearing mechanism 12 optimizes operational efficiency and reliability. Specifically, the doctor can quickly push or pull the operating ring 14 to the limit and sense when it is in place, achieving a one-touch switch of the spring clip state, thereby preventing the spring clip from being fully deployed or retracted due to a loose operating cable 13.

[0054] In one embodiment of the present invention, Figure 4 As shown, the expansion section 122 and the installation section 121 of the present invention are both formed into an arc-shaped cross section, and the arc-shaped cross section is bent toward the first cleaning pipe 1.

[0055] In this embodiment, the expansion section 122 and the mounting section 121 configured in this manner can not only enhance the structural strength (the arc-shaped cross-section is more resistant to bending than a planar structure and is not easily deformed when resisting tissue pulling), but can also fit the instrument channel 200 (in the retracted state, the arc-shaped spring clip fits tightly to the tube body, reducing the radial occupied space and facilitating movement in narrow channels). In addition, the expanded shape can also be optimized (after expansion, the arc naturally forms a "spoon-shaped" structure, which is easier to hold loose necrotic tissue and improve capture efficiency).

[0056] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 6 As shown, the second cleaning tube 2 of the present invention includes a second tube body 21 and a traveling cone head section 22 that are connected to each other. In the direction from the second tube body 21 to the traveling cone head section 22, the radial dimension of the traveling cone head section 22 gradually decreases, and the end of the second tube body 21 away from the traveling cone head section 22 extends outside the first tube body 11.

[0057] In this embodiment, the second clearing tube 2 configured in this manner can not only achieve smooth puncture and circuit opening (the cone head section can penetrate / separate adhesion tissue, clearing obstacles for subsequent shrapnel deployment), but also protect the barbs 3 and tissue (the cone tip guides the direction of movement of the barbs 3, preventing the barbs 3 from scratching non-target tissue during movement, thereby improving safety).

[0058] In one embodiment of the present invention, the advancing cone head section 22 is formed into one of the following structures: a conical structure, a pyramidal structure, or a truncated cone structure. This allows different advancing cone head sections 22 to be used in response to different tissue characteristics (it will be understood that the advancing cone head section 22 can be detachably connected to the second tube body 21 to facilitate replacement of different advancing cone head sections 22). For example, a conical or truncated cone structure can be used to penetrate soft, adherent tissue, while a pyramidal structure can be used to enhance the ability to cut and separate necrotic tissue.

[0059] In one embodiment of the present invention, as shown in the figure, a mounting hole 114 for the second tube body 21 to pass through is formed in the first tube body 11 of the present invention, and the radial dimension of the mounting hole 114 is larger than the radial dimension of the second tube body 21.

[0060] In this way, the mounting through hole 114 thus provided can not only ensure the freedom of movement of the second clearing tube 2, but also, through such a gap design, can enable the second tube body 21 to move axially in the first tube body 11 without friction, thereby avoiding jamming. Moreover, it can also provide a holding space for the necrotic tissue clamped by the first clearing tube 1 and the second clearing tube 2, thereby preventing the clamped necrotic tissue from falling off under the action of resistance when entering the instrument channel 200, thereby improving the clearing efficiency and clearing reliability to a certain extent.

[0061] In one embodiment of the present invention, as shown in the figure, the second purge tube 2 of the present invention further includes a sealing section 23, which is coaxially connected to the end of the second tube body 21 distal from the advancing cone section 22. Furthermore, the radial dimension of the sealing section 23 is larger than the radial dimension of the mounting through-hole 114. Thus, the sealing section 23 acts as a physical snap-fit ​​structure, preventing the second purge tube 2 from accidentally dislodging from the first purge tube 1. The physician can confidently apply force to pull on the second purge tube 2 without worrying about the risk of separation.

[0062] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A necrotic tissue removal clip under choledochoscopy, characterized in that: include: A first clearing tube (1) is used to be movably arranged in an instrument channel (200) of a choledochoscope, wherein the first clearing tube (1) comprises a first tube body (11) and a plurality of clearing shrapnel (12), wherein the plurality of clearing shrapnel (12) are connected to one end of the first tube body (11) at intervals along the circumference of the first tube body (11); A second cleaning tube (2) is coaxially and movably arranged inside the first cleaning tube (1); A plurality of barbs (3), respectively provided on the plurality of cleaning shrapnels (12) and the second cleaning tube (2), and the barbs (3) are used to hook necrotic tissue; When the first cleaning tube (1) is located in the instrument channel (200), the plurality of cleaning shrapnel (12) are radially constrained by the instrument channel (200) and are in a retracted state; when the first cleaning tube (1) extends out of the end of the instrument channel (200), the radial constraints of the plurality of cleaning shrapnel (12) are released and the plurality of cleaning shrapnel (12) are automatically radially expanded.

2. The necrotic tissue removal clip under choledochoscopy according to claim 1, characterized in that: The cleaning spring (12) comprises a mounting section (121) and an extension section (122) connected to each other, one end of the mounting section (121) away from the extension section (122) is connected to the end of the first tube body (11), an angle between the mounting section (121) and the extension section (122) is set to be an obtuse angle, and in the axial direction of the first cleaning tube (1), the length of the mounting section (121) is smaller than the length of the extension section (122).

3. The necrotic tissue removal clip under choledochoscopy according to claim 2, characterized in that: The first cleaning tube (1) further comprises a plurality of operating cables (13) arranged in one-to-one correspondence with the plurality of cleaning springs (12), one end of the operating cable (13) being connected to an end of the extension section (122) away from the installation section (121), and the other end of the operating cable (13) being passed through the first tube body (11) and extending out of the other end of the first tube body (11); The mounting section (121) is provided with an operating through hole (1211) for the operating rope (13) to pass through, and the barb (3) is provided on a side of the expansion section (122) close to the second cleaning tube (2).

4. The necrotic tissue removal clip under choledochoscopy according to claim 3, characterized in that: The first tube body (11) comprises a first section (111), a second section (112), and a third section (113) which are coaxially connected in sequence, an end of the first section (111) away from the second section (112) is connected to the cleaning spring (12), and a radial dimension of the second section (112) is smaller than the radial dimensions of the first section (111) and the third section (113); The first cleaning tube (1) further comprises an operating ring (14), the operating ring (14) being axially movably sleeved on the second section (112), and the end of the operating cable (13) away from the cleaning shrapnel (12) being connected to the operating ring (14).

5. The necrotic tissue removal clip under choledochoscopy according to claim 4, characterized in that: When the cleaning shrapnel (12) is in a retracted state, the operating rope (13) is in a tensioned state and the operating ring (14) is in contact with the third section (113); when the cleaning shrapnel (12) is radially expanded, the operating rope (13) is in a tensioned state and the operating ring (14) is in contact with the first section (111).

6. The necrotic tissue removal clip under choledochoscopy according to claim 2, characterized in that: The expansion section (122) and the installation section (121) are both formed into an arc-shaped cross-section, and the arc-shaped cross-section is bent toward the first cleaning tube (1).

7. The necrotic tissue removal clip for choledochoscopy according to claim 1, characterized in that: The second cleaning tube (2) comprises a second tube body (21) and a traveling cone head section (22) connected to each other. In the direction from the second tube body (21) to the traveling cone head section (22), the radial size of the traveling cone head section (22) gradually decreases, and one end of the second tube body (21) away from the traveling cone head section (22) extends outside the first tube body (11).

8. The necrotic tissue removal clip for choledochoscopy according to claim 7, characterized in that: The traveling cone head section (22) is formed into one of the following structures: a cone structure, a pyramid structure, and a frustum structure.

9. The necrotic tissue removal clip under choledochoscopy according to claim 7, characterized in that: A mounting through hole (114) for the second tube body (21) to pass through is formed in the first tube body (11), and the radial dimension of the mounting through hole (114) is larger than the radial dimension of the second tube body (21).

10. The necrotic tissue removal clip for choledochoscopy according to claim 9, characterized in that: The second cleaning tube (2) further comprises a blocking section (23), the blocking section (23) being coaxially connected to an end of the second tube body (21) away from the traveling cone head section (22), and the radial dimension of the blocking section (23) is greater than the radial dimension of the mounting through hole (114).

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