Anti-occlusive pancreatic duct stent

Abstract

The utility model relates to pancreas duct support technical field discloses the anti fistula pancreas duct support, including the outer tube, the inside of outer tube is provided with the inner tube, and the front end of outer tube is fixed with the front end of inner tube, and the outer circular wall surface of inner tube is equipped with a plurality of drainage holes, and the outer circular wall surface of outer tube is equipped with the anti -drop structure for preventing the support from falling off, and the anti -drop structure includes a plurality of unfolding holes, and a group is four in a plurality of unfolding holes. The utility model discloses through the setting of anti -drop structure, and after the support is inserted into pancreas duct, through the rotation movable sleeve and removes the locking, holds the fixed inner tube and pushes the outer tube and makes it automatic folding and unfolding at the bending groove, forms a plurality of outward opening paragraphs and sticks to the inner wall of pancreas duct, realizes stable anchoring, effectively prevents the support from falling off, and the distribution of unfolding structure is even, avoids local compression, and the polyurethane material is flexible, reduces the tissue damage, and can reset locking after unfolding, and the structure does not depend on the increasing mode of spherical diameter, reduces the resistance of pushing in the operation, improves the smoothness and accuracy of placing.

Description

Technical Field

[0001] This utility model relates to the field of pancreatic duct stent technology, and in particular to an anti-fistula pancreatic duct stent. Background Technology

[0002] Pancreatic duct stents are important medical devices commonly used in clinical practice for external pancreatic drainage and prevention of pancreatic fistula. Especially after high-risk pancreaticojejunostomy or pancreatogastrostomy, their use can effectively guide pancreatic juice outflow, reduce anastomotic tension, and reduce pancreatic juice extravasation, thereby significantly reducing the incidence of postoperative pancreatic fistula.

[0003] An existing anti-leakage pancreatic duct stent (publication number: CN215130873U) has at least the following drawbacks: Although the above-mentioned device increases the anti-slippage ability of the pancreatic duct tube by setting the anti-leakage ball, and achieves a good fixation effect, the stent is prone to getting stuck during the operation because the diameter of the ball tail end gradually increases. Especially when the pancreatic duct opening is narrow or there is tissue resistance, the pushing process is difficult, and it may even cause pancreatic duct trauma or the stent cannot be positioned, affecting the efficiency of the operation and the postoperative effect. As a result, the stent has poor performance. Therefore, we propose this utility model. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a pancreatic duct anti-fistula stent.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pancreatic duct stent for preventing fistula includes an outer tube, inside which is an inner tube. The front end of the outer tube is fixed to the front end of the inner tube. The outer circumference of the inner tube has several drainage holes. The outer circumference of the outer tube has an anti-dislodgement structure to prevent the stent from falling off. The anti-dislodgement structure includes several unfolding holes, which are grouped into sets of four. Each group of unfolding holes is evenly distributed along the circumference of the outer tube. The inner circumference of the outer tube has several bending grooves, which are located between two adjacent unfolding holes.

[0006] As a further embodiment of this utility model, the outer tube is connected and fixed with a movable sleeve, the inner tube is slidably arranged with the movable sleeve, the inner circle of the movable sleeve is fixed with a number of snap-fit ​​strips, the number of snap-fit ​​strips are spaced apart, the outer wall of the inner tube is fixed with a locking strip, the locking strip and the corresponding snap-fit ​​strip are slidably arranged with spaced apart.

[0007] As a further embodiment of this utility model, the outer circular wall of the outer tube is provided with a plurality of slots, and the drainage holes are located inside the slots.

[0008] As a further embodiment of this utility model, the inner circular wall of the outer tube is provided with a plurality of guide grooves, and the outer circular wall of the inner tube is fixed with guide strips, and the plurality of guide strips are slidably arranged with the interior of the plurality of guide grooves respectively.

[0009] As a further embodiment of this utility model, the guide groove is a T-shaped groove, and the guide strip corresponds to the shape of the guide groove.

[0010] As a further embodiment of this utility model, the outer circular wall of the inner tube is fixed with a number of limiting shafts, and the number of limiting shafts are respectively located inside a number of unfolding holes.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This anti-fistula pancreatic duct stent, through its anti-dislodgement structure, releases the lock by rotating the movable sleeve after insertion into the pancreatic duct. This pulls on the inner tube and pushes the outer tube forward, causing it to automatically unfold at the bending groove, forming multiple outward-opening segments that adhere to the inner wall of the pancreatic duct, achieving stable anchoring and effectively preventing stent dislodgement. The unfolded structure is evenly distributed, avoiding local pressure. The polyurethane material is flexible, reducing tissue damage. After unfolding, it can be reset and locked. The structure does not rely on the spherical diameter increment method, reducing intraoperative pushing resistance and improving placement smoothness and accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the anti-fistula pancreatic duct stent proposed in this utility model; Figure 2 This is a schematic diagram of the disassembled structure of the anti-fistula pancreatic duct stent proposed in this utility model; Figure 3 This is a schematic diagram of the disassembled structure of the outer tube of the anti-fistula pancreatic duct stent proposed in this utility model; Figure 4 The anti-fistula pancreatic duct stent proposed in this utility model Figure 2 A magnified structural diagram of point A in the middle.

[0013] Figure 5 The pancreatic duct stent for preventing fistula proposed in this utility model Figure 3 A magnified structural diagram at point B in the middle.

[0014] Figure 6 The pancreatic duct stent for preventing fistula proposed in this utility model Figure 3 A magnified structural diagram at point C.

[0015] In the diagram: 1. Outer tube; 2. Inner tube; 201. Unfolding hole; 202. Bending groove; 203. Movable sleeve; 204. Snap-fit ​​strip; 205. Locking strip; 3. Drainage hole; 301. Strip hole; 4. Guide groove; 401. Guide strip; 5. Limiting shaft. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Reference Figures 1-6 A pancreatic duct stent for preventing fistula includes an outer tube 1, an inner tube 2 inside the outer tube 1, the front end of the outer tube 1 being fixed to the front end of the inner tube 2, a plurality of drainage holes 3 being provided on the outer circular wall of the inner tube 2, and an anti-dislodgement structure being provided on the outer circular wall of the outer tube 1 to prevent the stent from falling off, the anti-dislodgement structure including a plurality of unfolding holes 201, the plurality of unfolding holes 201 being grouped in groups of four, each group of unfolding holes 201 being evenly distributed along the circumference of the outer tube 1, and a plurality of bending grooves 202 being provided on the inner circular wall of the outer tube 1, the plurality of bending grooves 202 being located between two adjacent unfolding holes 201.

[0020] In this embodiment, the outer tube 1 is connected and fixed with a movable sleeve 203. The inner tube 2 is slidably disposed within the movable sleeve 203. A plurality of locking strips 204 are fixed on the inner circle of the movable sleeve 203, and the locking strips 204 are spaced apart. A locking strip 205 is fixed on the outer wall of the inner tube 2, and the locking strip 205 is slidably disposed within the spaced intervals of the corresponding locking strip 204. All components of the bracket are made of polyurethane. With the anti-dislodgement structure, the user inserts the outer tube 1 and the inner tube 2 as a whole into the pancreatic duct and rotates them slightly. The movable sleeve 203 disengages the locking strip 205 from the gap between the locking strip 204, thereby releasing the restriction between the inner tube 2 and the movable sleeve 203. Subsequently, the surgeon pulls the inner tube 2 while simultaneously pushing the outer tube 1 forward. Since the front ends of the inner tube 2 and the outer tube 1 are fixedly connected, pushing the outer tube 1 creates a relatively fixed resistance point in the inner tube 2, causing axial compressive stress to be generated in the outer tube 1 along its axis. At this time, the tube wall portion between the circumferentially distributed unfolding holes 201 on the outer tube 1 experiences stress at the bending groove 202. Controlled plastic deformation allows the stent to automatically bend and expand at the desired location. During this expansion process, the outer tube 1 forms several outwardly expanding segments at multiple bending grooves 202. These expanding segments naturally bulge outward and adhere to the inner wall of the pancreatic duct, thereby anchoring and fixing the stent at the target location and preventing stent dislodgement due to pressure or peristalsis. Simultaneously, due to the grouping design of the expansion holes 201 and the precise setting of the bending grooves 202, the expansion segments are evenly distributed, ensuring stable contact with the duct wall without causing uneven pressure on the pancreatic duct, thus guaranteeing the safety and effectiveness of stent fixation. After the stent is expanded, the polyurethane material possesses a certain deformation memory and flexibility, achieving good wall adhesion while reducing the risk of damage to the pancreatic duct tissue. After expansion, the rotating movable sleeve 203 resets, allowing the locking strip 205 to slide into the interval of the corresponding snap-fit ​​strip 204 to complete the locking. Furthermore, the stent expansion structure does not rely on the physical embedding method of increasing spherical diameter, thus greatly reducing the intraoperative pushing resistance and improving the smoothness and accuracy of stent placement.

[0021] In this embodiment, the outer circular wall of the outer tube 1 is provided with a plurality of slots 301, and the drainage hole 3 is located inside the slots 301. The slots 301 can prevent the outer tube 1 from affecting the drainage hole 3 when it slides.

[0022] In this embodiment, the inner circular wall of the outer tube 1 is provided with a plurality of guide grooves 4, and the outer circular wall of the inner tube 2 is fixed with guide strips 401. The plurality of guide strips 401 are slidably disposed in the interior of the plurality of guide grooves 4. When the outer tube 1 slides, the guide strips 401 slide in the guide grooves 4 to guide the sliding of the outer tube 1.

[0023] In this embodiment, the guide groove 4 is a T-shaped groove, and the guide strip 401 corresponds to the shape of the guide groove 4. The special shape design of the guide groove 4 and the guide strip 401 can strengthen the connection between the outer tube 1 and the inner tube 2.

[0024] In this embodiment, a number of limiting shafts 5 are fixed on the outer circular wall of the inner tube 2. The limiting shafts 5 are located inside a number of unfolding holes 201. When the opening section of the outer tube 1 opens, one side of the inner wall of the unfolding hole 201 moves to the limiting shaft 5 and abuts against it, so that the limiting shaft 5 limits the opening range of the opening section of the outer tube 1 and maintains a suitable opening range.

[0025] Working principle: In use, the user inserts the outer tube 1 and inner tube 2 into the pancreatic duct as a whole, and slightly rotates the movable sleeve 203 to disengage the locking strip 205 from the gap between the locking strip 204, thereby releasing the restriction between the inner tube 2 and the movable sleeve 203. Then, the operator pulls the inner tube 2 and pushes the outer tube 1 forward at the same time. Since the front end of the inner tube 2 is fixedly connected to the outer tube 1, when the outer tube 1 is pushed, the inner tube 2 will form a relatively fixed resistance point, causing axial compressive stress to be generated in the outer tube 1 along its axis. At this time, the groups of circumferentially distributed unfolding holes 201 on the outer tube 1... The wall portion of the tube undergoes controlled plastic deformation at the bending groove 202, automatically bending and expanding outwards at that location. During this expansion process, the outer tube 1 forms several outwardly expanding segments at multiple bending grooves 202. These expanding segments naturally bulge outwards and abut against the inner wall of the pancreatic duct, thereby anchoring and fixing the stent at the target location and preventing stent dislodgement due to pressure or peristalsis. Simultaneously, due to the grouped design of the expanding holes 201 and the precise setting of the bending grooves 202, the expanding segments are evenly distributed, ensuring stable contact with the tube wall without causing damage to the pancreatic duct. Uniform pressure ensures the safety and effectiveness of stent fixation. After stent deployment, the polyurethane material's deformation memory and flexibility allow for good adhesion to the pancreatic duct while reducing the risk of damage. The rotating sleeve 203 resets after deployment, allowing the locking strip 205 to slide into the corresponding locking strip 204 for locking. Furthermore, the stent deployment structure does not rely on a physical embedding method with increasing spherical diameter, thus significantly reducing intraoperative pushing resistance and improving the smoothness and accuracy of stent placement. The perforation 301 prevents... When the outer tube 1 slides, it affects the drainage hole 3. Several guide strips 401 are slidably arranged inside several guide grooves 4. When the outer tube 1 slides, the guide strips 401 slide in the guide grooves 4 to guide the sliding of the outer tube 1. The special shape design of the guide grooves 4 and guide strips 401 can strengthen the connection between the outer tube 1 and the inner tube 2. When the opening section of the outer tube 1 opens, one side of the inner wall of the unfolding hole 201 moves to the limiting shaft 5 and abuts against it, so that the limiting shaft 5 limits the opening range of the opening section of the outer tube 1 and maintains a suitable opening range.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pancreatic duct stent for preventing fistula, comprising an outer tube (1), characterized in that: The outer tube (1) is provided with an inner tube (2). The front end of the outer tube (1) is fixed to the front end of the inner tube (2). The outer circular wall of the inner tube (2) is provided with a number of drainage holes (3). The outer circular wall of the outer tube (1) is provided with an anti-detachment structure to prevent the support from falling off. The anti-detachment structure includes a number of expansion holes (201). The number of expansion holes (201) are in groups of four. Each group of expansion holes (201) is evenly distributed along the circumference of the outer tube (1). The inner circular wall of the outer tube (1) is provided with a number of bending grooves (202). The number of bending grooves (202) are located between two adjacent expansion holes (201).

2. The pancreatic duct stent for preventing fistula according to claim 1, characterized in that, The outer tube (1) is connected to and fixed with a movable sleeve (203). The inner tube (2) is slidably arranged inside the movable sleeve (203). The inner circle of the movable sleeve (203) is fixed with a number of snap-fit ​​strips (204). The snap-fit ​​strips (204) are spaced apart. The outer wall of the inner tube (2) is fixed with a locking strip (205). The locking strip (205) and the corresponding snap-fit ​​strip (204) are slidably arranged inside the spaced apart.

3. The pancreatic duct stent for preventing fistula according to claim 2, characterized in that, The outer circular wall of the outer tube (1) is provided with several slots (301), and the drainage hole (3) is located inside the slots (301).

4. The anti-fistula pancreatic duct stent according to claim 3, characterized in that, The inner circular wall of the outer tube (1) is provided with several guide grooves (4), and the outer circular wall of the inner tube (2) is fixed with guide strips (401). The several guide strips (401) are respectively slidably arranged inside the several guide grooves (4).

5. The pancreatic duct stent for preventing fistula according to claim 4, characterized in that, The guide groove (4) is a T-shaped groove, and the guide strip (401) corresponds to the shape of the guide groove (4).

6. The pancreatic duct stent for preventing fistula according to claim 5, characterized in that, The outer circular wall of the inner tube (2) is fixed with several limiting shafts (5), and the several limiting shafts (5) are respectively located inside several unfolding holes (201).

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