Biliary tract stent

Abstract

The utility model discloses a biliary tract stent, and relates to the technical field of medical instruments. The biliary tract stent comprises a stent pipeline, the two ends of the stent pipeline are open, and the upper end of the stent pipeline is a hemispherical surface; the lower end of the stent pipeline is bent into a pigtail-shaped anti-falling structure; the stent pipeline is integrally formed, and the pigtail-shaped anti-falling structure has certain plasticity; drainage holes are formed in the surface of the stent pipeline and the pigtail-shaped anti-falling structure; a side wing supporting mechanism used for fixing the support pipeline and preventing the support pipeline from sliding off is arranged at the upper end of the support pipeline. According to the biliary tract stent, damage to the inner wall of the intestinal tract of a patient is reduced, meanwhile, the comfort degree of the stent in the placing process is improved, and therefore under the elastic function of the supporting side wings, after a stent pipeline is placed into the intestinal tract, the supporting side wings abut against the inner wall of the intestinal tract, and the fixing effect is achieved; the pigtail-shaped anti-falling structure enables the support to be firmer after being placed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a biliary stent. Background Art

[0002] The middle and lower segments of the common bile duct are tapered and gradually decrease in diameter from the duodenal papilla to the duodenal papilla. Benign biliary strictures are also common in the middle and lower segments of the common bile duct. Clinically, one or more plastic biliary stents are often placed in the bile duct to treat benign biliary strictures. For refractory benign biliary strictures, fully covered metal biliary stents are used. After being placed in the common bile duct, the upper end of the stent receives bile and the lower end connects to the duodenal papilla.

[0003] However, since plastic biliary stents or fully covered biliary metal stents have uniform diameters and no support points between them and the physiological structure of the bile duct, they are prone to displacement or slippage. Especially for patients with anastomotic stenosis after liver transplantation, the displacement rate of biliary stents is even higher. When biliary stents are used to treat stenosis in the middle and lower segments, displacement is more likely to occur, thus affecting the normal use of the stent. In view of this, a biliary stent is proposed to solve the above problems. Utility Model Content

[0004] The purpose of the present utility model is to solve at least one of the technical problems existing in the prior art and to provide a biliary stent that can solve the problem that plastic biliary stents or fully covered biliary metal stents are stents with uniform diameters and have no support points between them and the physiological structure of the bile duct, making them prone to displacement or slippage. In particular, for patients with anastomotic stenosis after liver transplantation, the displacement rate of the biliary stent is higher. When the biliary stent is used to treat stenosis in the middle and lower segments, it is more likely to be displaced, thereby affecting the normal use of the stent.

[0005] To achieve the above object, the present invention provides the following technical solution: a biliary stent, comprising a stent tube, both ends of the stent tube are open, and the upper end is a hemispherical surface;

[0006] The lower end of the bracket pipe is bent into a pigtail-shaped anti-slip structure;

[0007] The bracket pipe is integrally formed and the pigtail-shaped anti-slip structure has a certain plasticity;

[0008] Drainage holes are provided on the surface of the stent tube and the pigtail-shaped anti-detachment structure.

[0009] The upper end of the support pipe is provided with a side wing support mechanism for fixing the support pipe and preventing it from sliding.

[0010] Preferably, the wing support mechanism comprises an outer support tube integrally formed with the stent pipe, and both ends of the outer support tube are tapered surfaces;

[0011] Four supporting side wings are integrally formed on the outer supporting tube, and the supporting side wings are arranged on the outer supporting tube in a cross-shaped array.

[0012] Preferably, the supporting flanks are arranged in an arc shape.

[0013] Preferably, an anti-backflow installation groove is integrally formed on the inner wall of the support pipe, and a supporting ring is fixedly installed inside the anti-backflow installation groove;

[0014] The interior of the support ring is fixedly connected with an anti-backflow guide membrane, and the interior of the support ring is fixedly installed with an anti-backflow blocking grid;

[0015] A cross-shaped diversion groove is provided on the anti-backflow diversion film.

[0016] Preferably, a rubber gasket is fixedly mounted on the outer surface of the support ring.

[0017] Preferably, the anti-backflow guide film and the anti-backflow blocking grid are in contact with each other.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The biliary stent has two ends of the outer support tube set to a conical shape, thereby forming a stepped barrier between the stent tube and the stent tube, so that the stent tube can be placed into the intestine more smoothly. At the same time, the arc-shaped support side wings prevent the stent tube from being blocked during placement, thereby reducing damage to the patient's intestinal wall and improving the comfort of the stent during placement. Therefore, under the elastic function of the support side wings, when the stent tube is placed into the intestine, the support side wings contact the intestinal wall, thereby forming a fixing effect. The pigtail-shaped anti-slip structure can make the stent more secure after placement.

[0020] (2) When the biliary stent needs to have an anti-backflow function, the support ring can be inserted into the interior of the stent pipe. At this time, due to the elastic performance of the rubber gasket, the support ring can be firmly restricted at the location of the anti-backflow installation groove. Therefore, when the drainage liquid passes through the stent pipe, the drainage liquid passes through the anti-backflow blocking grid and the potential energy of the liquid flow causes the diversion groove on the anti-backflow diversion membrane to open, thereby allowing the liquid to flow normally. Since one side of the anti-backflow diversion membrane is in contact with the anti-backflow blocking grid, the diversion groove can only be opened to one side and cannot be opened to the other side. Therefore, the backflow phenomenon of the drainage liquid can be effectively avoided, thereby improving the functionality of the stent pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic structural diagram of a biliary stent according to the utility model;

[0023] Figure 2 This is a schematic diagram of a biliary stent according to the utility model;

[0024] Figure 3 This is a schematic diagram of the interior of the support pipe of the utility model;

[0025] Figure 4 For this utility model Figure 3 A in the middle is an enlarged schematic diagram;

[0026] Figure 5 This is a schematic diagram of the anti-backflow guide membrane of the utility model.

[0027] Figure numerals: 1. Support pipe; 2. Pigtail-shaped anti-slip structure; 3. Drainage hole; 4. External support tube; 5. Support wing; 6. Hemispherical surface; 7. Anti-backflow mounting groove; 8. Support ring; 9. Rubber gasket; 10. Guide groove; 11. Anti-backflow guide membrane; 12. Anti-backflow blocking grid. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, terms such as "greater than," "less than," and "exceed" are understood to exclude the number indicated, while terms such as "above," "below," and "within" are understood to include the number indicated. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] See also Figure 1-5 The utility model provides a technical solution: a biliary stent, comprising a stent tube 1, both ends of the stent tube 1 are open, and the upper end is a hemispherical surface 6;

[0033] The lower end of the support pipe 1 is bent into a pigtail-shaped anti-slip structure 2;

[0034] The support pipe 1 is integrally formed and the pigtail-shaped anti-slip structure 2 has a certain plasticity;

[0035] Drainage holes 3 are provided on the surface of the stent tube 1 and the pigtail-shaped anti-detachment structure 2;

[0036] The upper end of the support pipe 1 is provided with a side wing support mechanism for fixing the support pipe 1 and preventing it from sliding;

[0037] By setting up the pigtail-shaped anti-slip structure 2 and the side support mechanism, when the stent tube 1 is placed in the body, the stent tube 1 can be firmly placed in the intestine with the support of the side support mechanism and the pigtail-shaped anti-slip structure 2, thereby ensuring normal support for the intestine and drainage of bile, thereby improving the stability and firmness of the biliary stent after placement.

[0038] Furthermore, the wing support mechanism includes an outer support tube 4 integrally formed with the support pipe 1, and both ends of the outer support tube 4 are tapered surfaces;

[0039] Four supporting wings 5 ​​are integrally formed on the outer supporting tube 4, and the supporting wings 5 ​​are arranged on the outer supporting tube 4 in a cross-shaped array;

[0040] The supporting wing 5 is arranged in an arc shape and has elasticity.

[0041] By setting the two ends of the outer support tube 4 to a tapered shape, a stepped barrier is formed between it and the stent tube 1, so that the stent tube 1 can be placed into the intestine more smoothly. At the same time, the arc-shaped support side wings 5 ​​prevent the stent tube 1 from being blocked during placement, thereby reducing damage to the patient's intestinal wall and improving the comfort of the stent during placement. Therefore, under the elastic function of the support side wings 5, when the stent tube 1 is placed into the intestine, the support side wings 5 ​​contact the inner wall of the intestine, thereby forming a fixing effect, thereby supporting the intestine, and the drainage hole 3 can drain the bile, thereby ensuring the normal discharge of bile.

[0042] Furthermore, an anti-backflow installation groove 7 is integrally formed on the inner wall of the support pipe 1, and a supporting ring 8 is fixedly installed inside the anti-backflow installation groove 7;

[0043] The interior of the support ring 8 is fixedly connected with an anti-backflow guide membrane 11, and the interior of the support ring 8 is fixedly installed with an anti-backflow blocking grid 12;

[0044] The anti-backflow guide film 11 and the anti-backflow blocking grid 12 are attached to each other;

[0045] A cross-shaped guide groove 10 is provided on the anti-backflow guide membrane 11;

[0046] A rubber gasket 9 is fixedly mounted on the outer surface of the support ring 8;

[0047] When the support pipe 1 needs to have an anti-backflow function, the support ring 8 can be inserted into the interior of the support pipe 1. At this time, due to the elastic performance of the rubber gasket 9, the support ring 8 can be firmly restricted to the position of the anti-backflow mounting groove 7. Therefore, when the drainage liquid passes through the support pipe 1, the drainage liquid passes through the anti-backflow blocking grid 12 and the potential energy of the liquid flow causes the guide groove 10 provided on the anti-backflow guide film 11 to open, thereby allowing the liquid to flow normally. Since one side of the anti-backflow guide film 11 is in contact with the anti-backflow blocking grid 12, the guide groove 10 can only be opened to one side and cannot be opened to the other side. Therefore, the backflow phenomenon of the drainage liquid can be effectively avoided, thereby improving the functionality of the support pipe 1.

[0048] At the same time, the anti-backflow installation groove 7 can be opened at the end of the support pipe 1 or a position close to the end according to needs.

[0049] Working principle: By setting the two ends of the outer support tube 4 into a tapered shape, a stepped barrier is formed between it and the stent tube 1, so that the stent tube 1 can be placed into the intestine more smoothly. At the same time, the support side wings 5 ​​in the flipped state prevent the stent tube 1 from being blocked during placement, thereby reducing damage to the patient's intestinal wall and improving the comfort of the stent during placement. Therefore, under the elastic function of the support side wings 5, when the stent tube 1 is placed into the intestine, the support side wings 5 ​​contact the intestinal wall, thereby forming a fixing effect, thereby supporting the intestine. The drainage hole 3 can drain the bile, thereby ensuring the normal discharge of bile.

[0050] When the support pipe 1 needs to have an anti-backflow function, the support ring 8 can be inserted into the interior of the support pipe 1. At this time, due to the elastic performance of the rubber gasket 9, the support ring 8 can be firmly restricted to the position of the anti-backflow mounting groove 7. Therefore, when the drainage liquid passes through the support pipe 1, the drainage liquid passes through the anti-backflow blocking grid 12 and the potential energy of the liquid flow causes the guide groove 10 opened on the anti-backflow guide membrane 11, thereby allowing the liquid to flow normally. Since one side of the anti-backflow guide membrane 11 is in contact with the anti-backflow blocking grid 12, the guide groove 10 can only be opened to one side and cannot be opened to the other side. Therefore, the backflow phenomenon of the drainage liquid can be effectively avoided, thereby improving the functionality of the support pipe 1.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A biliary stent, comprising a stent tube (1), characterized in that: Both ends of the support pipe (1) are open, and the upper end is a hemispherical surface (6); The lower end of the support pipe (1) is bent into a pigtail-shaped anti-slip structure (2); The support pipe (1) is integrally formed and the pigtail-shaped anti-slip structure (2) has a certain plasticity; Drainage holes (3) are provided on the surface of the stent pipe (1) and the pigtail-shaped anti-slip structure (2); The upper end of the support pipe (1) is provided with a side wing support mechanism for fixing the support pipe (1) and preventing it from sliding.

2. A biliary stent according to claim 1, characterized in that: The wing support mechanism comprises an outer support tube (4) integrally formed with the support pipe (1), and both ends of the outer support tube (4) are tapered surfaces; Four supporting side wings (5) are integrally formed on the outer supporting tube (4), and the supporting side wings (5) are arranged on the outer supporting tube (4) in a cross-shaped array.

3. The biliary stent according to claim 2, characterized in that: The supporting flanks (5) are arranged in an arc shape.

4. The biliary stent according to claim 1, characterized in that: An anti-backflow installation groove (7) is integrally formed on the inner wall of the support pipe (1), and a supporting ring (8) is fixedly installed inside the anti-backflow installation groove (7); An anti-backflow guide membrane (11) is fixedly connected to the interior of the support ring (8), and an anti-backflow blocking grid (12) is fixedly installed inside the support ring (8); A cross-shaped guide groove (10) is provided on the anti-backflow guide membrane (11).

5. The biliary stent according to claim 4, characterized in that: A rubber gasket (9) is fixedly mounted on the outer surface of the supporting ring (8).

6. The biliary stent according to claim 4, characterized in that: The anti-backflow guiding film (11) and the anti-backflow blocking grid (12) are fitted together.

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