Cavity anastomosis guiding device

Abstract

The invention relates to the technical field of medical instruments, in particular to a cavity anastomosis guiding device, which is characterized in that one end of the far end of a catheter extends into the body of a patient through an endoscope forceps channel, a cutting head is aligned with a target tissue and punctures at the same time, so that the far end of a drainage bracket extends into the target tissue, and then a pull wire is pulled outwards to drive an annular skeleton on the outermost side to transversely move; each elastic strip is elastically bent and opened outwards, that is, the two ends of the drainage support are expanded outwards and opened into a lantern shape, so that the far-end lantern of the drainage support is tightly attached to the cavity wall of the target tissue, the near-end lantern of the drainage support is tightly attached to the cavity wall of the near-end tissue, and the two cavity walls are pulled close and firmly anchored until the pull wire is pulled apart and the annular framework is separated from the cutting head; after operation is finished, the catheter, the wire and the cutting head are moved out of the body, the drainage support continues to be retained until drainage is finished and then taken out, the complete and convenient one-step implantation process is achieved, the two ends of the support are convenient to expand and contract, and effective abutting against the cavity wall for limiting is facilitated.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a cavity anastomosis guidance device. Background Technology

[0002] Existing cavity-apposing metal stents, such as the LAMS stent, are metal stents specifically designed for endoscopic surgery. They are mainly used to create a stable passage between two cavities (such as cysts and stomach cavities, gallbladders and intestines, intestines and stomach cavities) within the digestive tract or biliary and pancreatic system. The LAMS stent features a unique dual-flange design, resembling a dumbbell. During use, guided by an endoscope, a puncture needle is inserted into the target cavity. A guidewire is then advanced through the needle, and once the location is confirmed, the needle is withdrawn. A LAMS stent of appropriate size is selected based on the lesion location and advanced along the guidewire. The flanges at both ends of the stent are positioned to abut against the walls of the two cavities. Drainage (e.g., cyst contents) is facilitated through the hollow channels within the stent. If a large amount of drainage occurs, it can be aspirated endoscopically, leaving the stent in place for several weeks until the affected area gradually heals. The stent is then removed endoscopically. However, current LAMS stents are primarily imported, resulting in high costs. Furthermore, the dumbbell-shaped flanges at both ends of the stent are often of a fixed shape, and considering the need for a large diameter drainage channel in the center, the flanges at both ends... The flange's outward expansion is limited, thus limiting its ability to confine the cavity wall and making it prone to displacement. Furthermore, the flange, which fixes the outward expansion during implantation and removal, provides significant resistance to penetration into the cavity wall. Forceful traction can easily cause tissue damage or bleeding. Moreover, the cavity formed after LAMS stent removal exceeds 1cm-1.5cm and is difficult to close on its own. Therefore, it is necessary to replace it with a smaller diameter plastic stent (8.5F or 10F) to maintain it for a period of time before finally removing the plastic stent. Only then can the smaller cavity close on its own. Thus, it is still necessary to optimize the design of a new cavity anastomosis guiding stent and device to achieve a convenient one-step implantation process. In addition, the design of outward expansion and confinement parts at both ends can facilitate bulging and contraction operations, achieving more efficient confinement against the cavity wall and implantation and removal. Moreover, it is not necessary to replace it with a smaller diameter plastic stent after removal. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a cavity anastomosis guidance device to solve the problems of how to achieve a more convenient one-step implantation process for drainage stents in existing cavity anastomosis and drainage surgeries, and how to facilitate the expansion and contraction of the outwardly expanding limiting parts at both ends of the stent, so as to achieve more efficient abutment against the cavity wall for limiting and implantation and removal.

[0004] To achieve the above objectives, the present invention provides a cavity anastomosis guidance device, comprising a catheter for insertion into the body, one end of which is connected to a drainage stent:

[0005] The end of the catheter away from the drainage stent is connected to a handle, and a wire is connected to the handle. One end of the wire passes through the inside of the catheter and the drainage stent in sequence, and is connected to a cutting head.

[0006] The drainage stent includes multiple parallel and spaced annular skeletons. The inner annular skeletons are laterally connected by strip frames, and the outermost annular skeleton is laterally connected to its adjacent annular skeleton by elastic strips. Multiple strip frames and elastic strips are arranged at intervals along the circumference of the annular skeletons. The elastic strips are in an initial state of elastic elongation so that a cylindrical cavity is formed inside the annular skeleton. The annular skeleton at the end away from the catheter is movably connected to the cutting head.

[0007] The strip frame is connected to a threading section, and a pull wire is threaded through the threading section. One end of the pull wire is connected to the outermost annular skeleton, and the other end is threaded through the inside of the drainage support and the catheter in sequence. By pulling the pull wire, the outermost annular skeleton is moved laterally, so that each elastic strip is elastically bent and stretched outward until the pull wire is broken. At the same time, the annular skeleton is disengaged from the cutting head, and the catheter, wire and cutting head are moved out of the body by the handle.

[0008] Preferably, a rigid sleeve is fitted onto the end of the guide wire away from the handle. The rigid sleeve passes through the drainage support and is fixedly connected to the cutting head. An annular frame is fixedly connected inside the end of the guide wire away from the handle, and the annular frame is fixedly connected to the rigid sleeve.

[0009] Preferably, the rigid sleeve is provided with a thread guide for threading the pull wire, and a shearing part is provided inside the thread guide along the threading direction. The pull wire is provided with an easy-tear point, the diameter of which is larger than the diameter of the pull wire. When the pull wire is pulled into place, the easy-tear point is pulled into the thread guide and cut off by the shearing part.

[0010] Preferably, the threading section is symmetrically arranged on the strip frame on both sides, and the pull wire is connected to both sides of the ring frame respectively.

[0011] Preferably, the inner annular frame has through holes for the strip frame to pass through. The pull wires passing through the threading part are divided into two strands, one connected to the outermost annular frame and the other connected to the inner annular frame. The pull wires drive the outermost annular frame to move laterally, so that when each elastic strip begins to bend elastically, the other pull wire is in a relaxed state. Until each elastic strip bends elastically to the desired position, the other pull wire becomes taut and drives each annular frame to move laterally toward the threading part until the pull wire is broken.

[0012] Preferably, the strip frame is provided with multiple elastic protrusions spaced apart along its length. When the annular frame moves laterally along the strip frame, each elastic protrusion elastically squeezes through the through hole in sequence.

[0013] Preferably, the end of the pull cord away from the handle is provided with barbs at intervals. When the pull cord is pulled outward, the barbs pass through the opening of the threaded part until the pull cord is broken, at which point the barbs are reversed and locked onto the outer end of the opening.

[0014] Preferably, an easy-tear strip is connected between the inner ring of the annular skeleton at the end away from the conduit and the outer periphery of the cutting head. When the annular skeleton moves laterally, the easy-tear strip is torn open so that the annular skeleton is separated from the cutting head.

[0015] Preferably, the end of the cutting head near the conduit is integrally connected to a connecting part, and is connected to the wire through the connecting part, wherein the outer diameter of the connecting part gradually decreases in the direction toward the wire.

[0016] The beneficial effects of this invention are as follows: The distal end of the catheter, away from the handle, is inserted into the patient's body through the endoscopic forceps channel. The cutting head is precisely aligned with the target tissue for puncture or channel dilation, allowing the distal end of the drainage stent to extend into the target tissue. By pulling the suture outward, the outermost annular skeleton is moved laterally, causing each elastic strip to bend elastically and expand outward. That is, both ends of the drainage stent expand outward into a lantern shape, so that the distal lantern-shaped outward-expanding limiting portion adheres tightly to the cavity wall of the target tissue, and the proximal lantern-shaped outward-expanding limiting portion adheres tightly to the cavity wall of the proximal tissue. The two cavity walls are pulled closer and firmly anchored by the outward expansion limiting parts at both ends. The suture is pulled outward until it breaks, and the ring skeleton separates from the cutting head. At this point, the catheter, lead wire, and cutting head are moved out of the body by the handle, while the drainage stent remains in the body for several weeks. After the drainage is completed, the drainage stent is removed again through the endoscopic forceps channel. This achieves a complete and convenient one-step implantation or removal process. The outward expansion limiting parts at both ends of the stent are easy to open and close, which facilitates more efficient contact with the cavity wall for positioning and implantation and removal. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the handle of the present invention;

[0019] Figure 2 This is a cross-sectional view of the catheter and drainage stent of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of each ring skeleton of the present invention;

[0021] Figure 4This is a schematic diagram of the structure of the distal and proximal elastic strips of the present invention, showing simultaneous elastic bending.

[0022] Figure 5 This is a schematic diagram of the structure of the present invention, which shows how the pull wire drives the distal and proximal annular skeletons to move laterally simultaneously.

[0023] Figure 6 This is a schematic diagram of the structure of the elastic strips that extend outward at both ends of the present invention and move laterally closer together;

[0024] Figure 7 This is a schematic diagram of the structure of the present invention, in which the pull wire drives each ring skeleton to move laterally toward the threading part;

[0025] Figure 8 This is a front view schematic diagram of the catheter and drainage stent of the present invention;

[0026] Figure 9 This is a schematic diagram of the structure of the drainage support of the present invention when both ends are opened;

[0027] Figure 10 This is a schematic diagram of the structure of the drainage support at both ends of the present invention when anchored.

[0028] Figure 11 This is a side view of the wire-passing part and the cutting part of the present invention.

[0029] Figure 12 This is a schematic diagram of the structure of the drawstring and barbs of the present invention;

[0030] Figure 13 This is a cross-sectional view of the catheter and drainage stent used in this invention, which are mainly applicable to scenarios where the target tissue and proximal tissue are far apart.

[0031] Figure 14 This is a schematic diagram of the structure of each ring skeleton in the present invention, which is mainly applicable to scenarios where the target tissue and the proximal tissue are far apart.

[0032] Figure 15 This is a schematic diagram of the distal end of the drainage stent, which is mainly applicable to scenarios where the target tissue and proximal tissue are far apart.

[0033] Figure 16 This is a schematic diagram of the proximal opening of the drainage stent, which is mainly applicable to scenarios where the target tissue and proximal tissue are far apart.

[0034] Figure 17 This is a schematic diagram of the drainage stent of the present invention when it is used for drainage.

[0035] The diagram is marked as follows:

[0036] 1. Catheter; 2. Drainage support; 21. Circular skeleton; 22. Membrane sheath; 23. Strip frame; 24. Elastic strip; 3. Handle; 31. Pull rod; 4. Lead wire; 5. Cutting head; 51. Connecting part; 6. Threading part; 61. Through-hole; 7. Pull wire; 71. Barb; 72. Easy-tear point; 8. Rigid cannula; 9. Circular frame; 10. Thread passage part; 11. Cutting part. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0038] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, a cavity anastomosis guidance device includes a catheter 1 for insertion into the body. One end of the catheter 1 is connected to a drainage support 2, and the end of the catheter 1 away from the drainage support 2 is connected to a handle 3. A wire 4 is connected to the handle 3. One end of the wire 4 passes through the interior of the catheter 1 and the drainage support 2 in sequence and is connected to a cutting head 5. The drainage support 2 includes multiple parallel and spaced annular frames 21. Strip frames 23 are laterally connected between the inner annular frames 21, and elastic strips 24 are laterally connected between the outermost annular frame 21 and its adjacent annular frame 21. Multiple strip frames 23 and elastic strips 24 are arranged at intervals along the circumference of the annular frames 21. The tube 2 is initially in an elastic elongation state, so that a cylindrical cavity is formed inside the drainage support 2. The annular frame 21 at the end away from the catheter 1 is movably connected to the cutting head 5. A threading part 6 is connected to the strip frame 23. A pull wire 7 is threaded through the threading part 6. One end of the pull wire 7 is connected to the outermost annular frame 21, and the other end is sequentially threaded through the inside of the drainage support 2 and the catheter 1. By pulling the pull wire 7, the outermost annular frame 21 is moved laterally, so that each elastic strip 24 is in an elastic bending state and is stretched outward until the pull wire 7 is broken. At the same time, the annular frame 21 is disengaged from the cutting head 5. The catheter 1, the lead wire 4, and the cutting head 5 are moved out of the body by the handle 3.

[0040] This invention relates to a minimally invasive surgical procedure using endoscopy combined with inferior vena cava anastomosis and drainage, along with its drainage stent and device. It includes a catheter 1 for insertion into the body, with a drainage stent 2 connected to one end. The catheter 1 employs a flexible hollow tube structure. A handle 3 is connected to the end of the catheter 1 furthest from the drainage stent 2, allowing medical personnel to hold it externally. A wire 4 is connected to the handle 3, with one end of the wire 4 passing sequentially through the interior of the catheter 1 and the drainage stent 2, and connected to a cutting head 5. The cutting head 5 utilizes components from existing inferior vena cava anastomosis and drainage procedures, such as electrocautery devices and cavitation heads, and is powered by the wire 4. The handle 3 may also have an operating button for controlling the power supply to the cutting head 5, facilitating its use. Figure 2 , Figure 3 , Figure 8As shown, the drainage support 2 includes multiple parallel and spaced annular frames 21. The annular frames 21 are circular in shape and coaxial with the drainage support 2. The inner annular frames 21 are laterally connected by strip frames 23, and the outermost annular frame 21 is laterally connected to its adjacent annular frame 21 by elastic strips 24. The length direction of the strip frames 23 and elastic strips 24 is parallel to the axial direction of the annular frames 21. Multiple strip frames 23 and elastic strips 24 are arranged at intervals along the circumference of the annular frames 21. The annular frames 21, strip frames 23, and elastic strips 24 all adopt existing drainage support methods. Made of conventional alloy material, a membrane sleeve 22 is fitted between each strip frame 23, or between the inner annular skeleton 21, or along the outer perimeter of the annular skeleton 21. The membrane sleeve 22 can be made of existing soft plastic materials, such as latex film or silicone film, or it can be woven from alloy wire and then covered with silicone film to form a stable cavity drainage channel. In particular, a stable cavity drainage channel should be formed between the inner annular skeletons 21. The annular skeleton 21 can be fixedly connected to the membrane sleeve 22. The elastic strip 24 adopts a thin sheet structure design. The elastic strip 24 is in an initial state of elastic elongation, such as... Figure 2 , Figure 3 , Figure 8 As shown, a cylindrical cavity is formed inside the annular frame 21. The annular frame 21 at the end away from the conduit 1 is movably connected to the cutting head 5. A threading part 6 is connected to the strip frame 23. A pull line 7 is threaded through the threading part 6. The pull line 7 can be a thin line structure similar to fishing line. One end of the pull line 7 is connected to the outermost annular frame 21, and the other end is threaded through the inside of the drainage support 2 and the conduit 1 in sequence. Specifically, a pull rod 31 can be movably inserted into one end of the handle 3 along its length direction, and the other end of the pull line 7 can be connected to the pull rod 31.

[0041] Therefore, during use, the distal end of catheter 1, away from handle 3, can be inserted into the patient's body through the endoscopic forceps channel. Ultrasound / imaging is used to confirm the target tissue (such as the cyst cavity). Handle 3 is typically manipulated to precisely align the cutting head 5 with the target tissue (such as the cyst cavity) for puncture or channel dilation, allowing the distal end of the drainage stent 2 to extend into the target tissue (such as the cyst cavity). At this point, pulling the pull rod 31 outwards, i.e., pulling the pull wire 7, allows the drainage stent 2 to extend into the target tissue (such as the cyst cavity). Figure 4 , Figure 5As shown, the outermost annular skeleton 21 is moved laterally so that each elastic strip 24 is elastically bent and stretched outwards, that is, the two ends of the drainage stent 2 are expanded outwards into a lantern shape. The distal lantern-shaped outward-expanding limiting part adheres tightly to the cavity wall of the target tissue (such as the cyst cavity), and the proximal lantern-shaped outward-expanding limiting part adheres tightly to the cavity wall of the proximal tissue (such as the stomach, intestines, etc.). The two cavity walls are pulled closer and firmly anchored by the outward-expanding limiting parts at both ends. Ultrasound / imaging confirms that the drainage stent 2 is firmly anchored in place and that the drainage stent 2 is patent and leak-free. Then, endoscopic-assisted aspiration is used to drain the contents (such as cyst pus) immediately. At this time, the pull wire 7 is pulled outwards until it is broken, and the annular skeleton 21 disengages from the cutting head 5. Then, the handle 3 drives the catheter 1, lead wire 4, and cutting head 5 out of the body. The drainage stent 2 remains in the body for several weeks. Figure 17 As shown, continue to drain the remaining contents. The remaining contents are absorbed or excreted with the proximal tissues (such as the stomach, intestines, etc.) until the affected area gradually heals and the drained contents become less and less. Then, the drainage stent 2 can be removed again through the endoscopic forceps channel.

[0042] Among them, such as Figure 5 As shown, the threading part 6 can adopt a cylindrical structure design. An opening 61 can be provided at the end of the threading part 6 away from the strip frame 23, and multiple outlets can be provided at the end closer to the strip frame 23. One end of the pull wire 7 passes through the outlet and connects to the annular frame 21, while the other end passes through the opening 61, then sequentially passes through the interior of the drainage bracket 2 and the conduit 1, and connects to the pull rod 31. The end of the pull wire 7 away from the handle 3 is provided with barbs 71 spaced apart. Figure 12 As shown, the barb 71 can be made of a material with a certain degree of elasticity, such as rubber, and its outer diameter is larger than the inner diameter of the opening 61. When the pull wire 7 is pulled outward, the barb 71 passes through the opening 61 of the thread part 6 until the pull wire 7 is broken. Then, the barb 71 is reversed and locked onto the outer end of the opening 61 to prevent the elastic strip 24 from automatically rebounding and resetting during the indwelling period of the drainage stent 2. When the drainage stent 2 needs to be removed, a forceps can be inserted into the patient's body through the endoscopic forceps channel. Ultrasound / imaging confirms that the forceps are inserted into the drainage stent 2. The pull wire 7 or the opening 61 is cut by the forceps, so that the elastic strip 24 rebounds and resets to its initial state, and the drainage stent 2 resets into a cylindrical tube shape, which facilitates the removal of the drainage stent 2 and reduces damage to tissues, mucous membranes, etc., and reduces bleeding. Thus, a complete and convenient one-step implantation or removal process is achieved. The expansion and contraction of the two ends of the stent are easy to operate, which is conducive to more efficient contact with the cavity wall for positioning and implantation and removal.

[0043] In contrast to existing LAMS stents, where the annular protrusions at both ends are mostly designed with a fixed shape, the cavity formed on the tissue wall during implantation and removal is larger than 1cm-1.5cm and is difficult to close on its own. Therefore, it is necessary to replace it with a plastic stent with a smaller diameter to maintain it for a period of time before finally removing the plastic stent. Only then can the smaller cavity close on its own. In this invention, the elastic strip 24 facilitates the opening and closing operation, which is conducive to forming a smaller cavity. After removal, it is not necessary to replace it with a plastic stent with a smaller diameter.

[0044] In embodiments of the present invention, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, a rigid sleeve 8 is fitted onto the end of the lead wire 4 away from the handle 3. The rigid sleeve 8 passes through the drainage support 2 and is fixedly connected to the cutting head 5. An annular frame 9 is fixedly connected inside the end of the conduit 1 away from the handle 3. The annular frame 9 is fixedly connected to the rigid sleeve 8. Specifically, the annular frame 9 has a circular structure design and can be fixedly connected to the rigid sleeve 8 through a radial connecting rod set in the radial direction on its inner side for further stabilizing support. More preferably, a connecting part 51 is integrally connected to the end of the cutting head 5 near the conduit 1, and is connected to the lead wire 4 and the rigid sleeve 8 through the connecting part 51. The outer diameter of the connecting part 51 is oriented towards the lead wire 4. As the diameter gradually decreases, an easy-tear strip connects the inner ring of the annular skeleton 21, which is furthest from the end of the catheter 1, to the outer periphery of the cutting head 5. This easy-tear strip can be made of conventional mesh easy-tear thread or easy-tear tape, etc. During use, the distal end of the catheter 1, furthest from the handle 3, can be inserted into the patient's body through the endoscopic forceps channel. The cutting head 5, connecting part 51, rigid cannula 8, annular frame 9, and distal end of the catheter 1 are sequentially and securely connected. The cutting head 5 is then steadily advanced along with the distal end of the catheter 1 until it is aligned with the target tissue (such as a cyst cavity) for puncture or channel dilation. During this advancement, the distal annular skeleton 21 is fitted onto the cutting head 5 and connected by the easy-tear strip. Figure 8 As shown, the drainage support 2 is advanced synchronously and maintains a cylindrical shape until the pull wire 7 pulls the annular skeleton 21 to move laterally, at which point the easy-tear strip is torn open so that the annular skeleton 21 is separated from the cutting head 5. The variable diameter design of the connecting part 51 facilitates the connecting part 51 and the cutting head 5 to pass through the cavity of the drainage support 2 together and be moved out of the body together with the catheter 1 and the wire 4.

[0045] In embodiments of the present invention, optionally, such as Figure 2 , Figure 11As shown, the rigid sleeve 8 is provided with a thread-passing part 10 for threading the pull wire 7. The thread-passing part 10 is provided with a cutting part 11 along its threading direction. The pull wire 7 is provided with an easy-tear point 72. The diameter of the easy-tear point 72 is larger than the diameter of the pull wire 7. Specifically, the cutting part 11 can be designed along the radial direction inside the thread-passing part 10 and is sharpened on the side facing the threading direction. The easy-tear point 72 can be designed as a hollow rubber sphere with a slightly larger diameter. The pull wire 7 inside the sphere is designed to be cut off. So when the pull wire 7 is pulled into place, that is, when the drainage bracket 2 is stably anchored in place, the easy-tear point 72 is pulled into the thread-passing part 10 and cut off by the cutting part 11. The remaining short wire is left in the body with the drainage bracket 2, and the remaining long wire is moved out of the body along with the catheter 1, the wire 4, and the cutting head 5 by the handle 3.

[0046] In embodiments of the present invention, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, the threading part 6 is symmetrically arranged on the strip frame 23 on both sides, and the pull line 7 is connected to both sides of the ring frame 21 respectively, that is, pulling the two sides of the ring frame 21 is conducive to driving the ring frame 21 to move laterally in a stable manner.

[0047] As an optional embodiment of the present invention, such as Figure 1 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 As shown, the strip frame 23 can be fixedly connected to the inner annular skeleton 21, providing stable support and connection. This means the inner annular skeleton 21 will not move relative to each other. The strip frame 23 is designed with a relatively short length, making it suitable for scenarios where the target tissue and proximal tissue are far apart. More preferably, the pull wire 7 extending along the threading part 6 is divided into two strands, one connected to the distal annular skeleton 21 and the other to the proximal annular skeleton 21. During use, the cutting head 5 is used to puncture or dilate the target tissue. Figure 13 , Figure 14 As shown, to allow the distal end of the drainage stent 2 to extend into the target tissue, one of the pull wires 7 is pulled outwards, as... Figure 15As shown, the pull wire 7 moves the distal annular skeleton 21 laterally, causing it to gradually detach from the cutting head 5. Even if the drainage stent 2 tends to retract, it will be blocked by the catheter 1 and the annular frame 9, causing the distal elastic strips 24 to bend elastically and expand outwards. Meanwhile, the other pull wire 7 is relaxed until the distal end of the drainage stent 2 expands outwards into a lantern shape and adheres tightly to the cavity wall of the target tissue. Ultrasound / imaging confirms stable anchoring at the distal end. Then, the catheter 1 is appropriately retracted along the endoscopic forceps channel, moving the cavity wall of the anchored target tissue towards the proximal tissue until the proximal end of the drainage stent 2 extends into the proximal tissue. At this point, the other pull wire 7 is pulled outwards again, as... Figure 16 As shown, the elastic strips 24 at the proximal end bend elastically and expand outward. At this time, even if the drainage stent 2 has a tendency to retract, it will be limited by the distal cavity wall or blocked by the forward-pushing catheter 1 and the ring frame 9 until the proximal end of the drainage stent 2 expands outward into a lantern shape and adheres tightly to the cavity wall of the proximal tissue. Ultrasound / imaging confirms that the distal end is firmly anchored. At this time, the proximal tissue and the target tissue that are far apart are pulled closer and can be anchored and drained by the drainage stent 2. Continue to pull the pull line 7 outward until the tear point 72 is torn along the thread 10. Then, the catheter 1, the lead wire 4, and the cutting head 5 are removed from the body together. Figure 17 As shown, the indwelling drainage has been completed.

[0048] Two pull rods 31 are movably inserted along one end of the handle 3. Each pull rod 31 is semi-cylindrical, and the two pull rods 31 abut against each other to form a complete cylindrical shape. The two pull rods 31 are used to connect two separate pull wires 7 respectively, thereby realizing the individual pull operation of a single wire.

[0049] As an optional embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, this design is primarily suitable for scenarios where the target tissue and proximal tissue are close together. The inner annular frame 21 has a through hole for the strip frame 23 to pass through. The pull wire 7, extending along the threading section 6, is divided into two strands: one connected to the outermost annular frame 21, and the other connected to the inner annular frame 21. The two pull wires 7 can be controlled separately by the two pull rods 31 as described above, or by a single cylindrical pull rod 31. That is, the proximal pull wire 7 is a single strand design, and the distal pull wire 7 is a multi-strand design. In use, the cutting head 5 is aligned with the target tissue for puncture or duct expansion. Figure 2 , Figure 3 , Figure 8As shown, the distal end of the drainage stent 2 extends into the target tissue. At this time, since the target tissue and the proximal tissue are close together, the proximal end of the drainage stent 2 is located within the proximal tissue. The outermost annular skeleton 21 is moved laterally by the outward pulling wire 7. Figure 4 , Figure 5 , Figure 9 As shown, simultaneously, the elastic strips 24 at both the distal and proximal ends begin to bend elastically. Using ultrasound / imaging to confirm the position of the drainage stent 2, the position of the catheter 1 can be slightly pushed forward to ensure that the distal end of the catheter 1 always rests against the drainage stent 2, preventing the drainage stent 2 from retracting when the suture is pulled. At this time, the other suture 7 is in a relaxed state until all the elastic strips 24 are elastically bent into place, and both ends of the drainage stent 2 are expanded outward into a lantern shape, while the other suture 7 is in a taut state. Figure 6 , Figure 7 , Figure 10 As shown, continue pulling the pull line 7 outwards and move each annular skeleton 21 laterally toward the threading part 6, thereby further pulling the proximal tissue and target tissue closer. Use ultrasound / imaging to confirm that both ends of the drainage stent 2 are firmly anchored to the tissue cavity wall for drainage. Continue pulling the pull line 7 outwards until the pull line 7 is broken. Then, operate the catheter 1, lead wire 4, and cutting head 5 to remove them from the body together. Figure 17 As shown, the indwelling drainage has been completed.

[0050] The strip frame 23 can be provided with multiple elastic protrusions at intervals along its length. When the ring frame 21 moves laterally along the strip frame 23, each elastic protrusion elastically squeezes through the through hole in sequence, which plays a damping role.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A cavity anastomosis guidance device, comprising a catheter (1) for insertion into the body, one end of the catheter (1) being connected to a drainage stent (2), characterized in that: The end of the catheter (1) away from the drainage support (2) is connected to a handle (3), and a wire (4) is connected to the handle (3). One end of the wire (4) passes through the inside of the catheter (1) and the drainage support (2) in sequence, and is connected to a cutting head (5). The drainage support (2) includes multiple parallel and spaced annular frames (21). The inner annular frames (21) are laterally connected by strip frames (23). The outermost annular frame (21) is laterally connected to its adjacent annular frame (21) by an elastic strip (24). Multiple strip frames (23) and elastic strips (24) are arranged at intervals along the circumference of the annular frame (21). The elastic strips (24) are in an initial state of elastic elongation so that a cylindrical cavity is formed inside the drainage support (2). The annular frame (21) at the end away from the catheter (1) is movably connected to the cutting head (5). The strip frame (23) is connected to a threading part (6), and a pull wire (7) is threaded through the threading part (6). One end of the pull wire (7) is connected to the outermost annular frame (21), and the other end is threaded through the inside of the drainage support (2) and the conduit (1) in sequence. By pulling the pull wire (7), the outermost annular frame (21) is moved laterally so that each elastic strip (24) is in an elastic bending state and is stretched outward until the pull wire (7) is broken. At the same time, the annular frame (21) is separated from the cutting head (5), and the conduit (1), the wire (4), and the cutting head (5) are moved out of the body by the handle (3).

2. The cavity anastomosis guiding device according to claim 1, characterized in that, The end of the wire (4) away from the handle (3) is fitted with a rigid sleeve (8), which is inserted into the drainage bracket (2) and fixedly connected to the cutting head (5). The end of the conduit (1) away from the handle (3) is fixedly connected with a ring frame (9), which is fixedly connected to the rigid sleeve (8).

3. The cavity anastomosis guiding device according to claim 2, characterized in that, The rigid sleeve (8) is provided with a thread-passing part (10) for threading the pull wire (7). The thread-passing part (10) is provided with a cutting part (11) along its threading direction. The pull wire (7) is provided with an easy-tear point (72). The diameter of the easy-tear point (72) is larger than the diameter of the pull wire (7). When the pull wire (7) is pulled into place, the easy-tear point (72) is pulled into the thread-passing part (10) and cut off by the cutting part (11).

4. The cavity anastomosis guiding device according to claim 1, characterized in that, The threading part (6) is symmetrically arranged on the strip frame (23) on both sides, and the pull wire (7) is connected to both sides of the ring frame (21).

5. The cavity anastomosis guiding device according to claim 1, characterized in that, The inner ring frame (21) has through holes for the strip frame (23) to pass through. The pull wire (7) passing through the threading part (6) is divided into two strands. One strand is connected to the outermost ring frame (21), and the other strand is connected to the inner ring frame (21). The pull wire (7) drives the outermost ring frame (21) to move laterally so that when each elastic strip (24) begins to bend elastically, the other pull wire (7) is in a relaxed state. Until each elastic strip (24) is bent elastically in place, the other pull wire (7) becomes tense and drives each ring frame (21) to move laterally toward the threading part (6) until the pull wire (7) is broken.

6. The cavity anastomosis guiding device according to claim 5, characterized in that, The strip frame (23) is provided with multiple elastic protrusions spaced apart along its length. When the ring frame (21) moves laterally along the strip frame (23), each elastic protrusion elastically squeezes through the through hole in sequence.

7. The cavity anastomosis guiding device according to claim 1, characterized in that, The pull wire (7) has barbs (71) spaced apart on one end away from the handle (3). When the pull wire (7) is pulled outward, the barbs (71) pass through the opening (61) of the threading part (6) until the pull wire (7) is broken. Then the barbs (71) are hooked in the opposite direction to the outside end of the opening (61).

8. The cavity anastomosis guiding device according to claim 1, characterized in that, An easy-tear strip connects the inner ring of the annular skeleton (21) away from the end of the conduit (1) to the outer periphery of the cutting head (5). When the annular skeleton (21) moves laterally, the easy-tear strip is torn open so that the annular skeleton (21) is separated from the cutting head (5).

9. A cavity anastomosis guiding device according to claim 1, characterized in that, The cutting head (5) has a connecting part (51) integrally connected to one end near the conduit (1), and is connected to the wire (4) through the connecting part (51). The outer diameter of the connecting part (51) gradually decreases in the direction toward the wire (4).

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