Self-discharging type double-helix biliary stent

Abstract

The utility model provides a self-discharging type double-helix biliary stent, and belongs to the technical field of medical drainage catheters. Comprising a stent body, and the stent body comprises a connecting pipe, a first spiral pipe and a second spiral pipe; the connecting pipe is used for fixedly connecting the first spiral pipe and the second spiral pipe; the first spiral tube is mounted on one side of the connecting tube and used for draining bile; the second spiral pipe is installed on the side, away from the first spiral pipe, of the connecting pipe. Compared with an existing double-pigtail stent or a self-discharging type biliary tract spiral stent, the spiral structure of the two sets of spiral tubes can better adapt to the physiological form of the biliary tract, stable fixation is formed, the risk that an original stent with one end being of a vertical structure possibly pierces the intestinal wall is avoided, and the intestinal tract can be more stably fixed. Due to the arrangement of the self-discharging double-helix biliary stent, convenience is provided for taking out the stent subsequently.

Description

Technical Field

[0001] The utility model relates to the technical field of medical drainage catheters, and particularly relates to a self - draining double - helix biliary stent. Background Art

[0002] A biliary stent is a medical device used to treat biliary diseases. Its main function is to maintain the patency of the biliary tract and relieve a series of symptoms caused by biliary obstruction. The shapes and sizes of biliary stents are diverse to adapt to the anatomical structures and lesion conditions of the biliary tracts of different patients.

[0003] In clinical applications, biliary stent implantation is usually carried out under the guidance of imaging equipment, such as X - rays, endoscopes, etc. Through these means, doctors can accurately place the stent at the site of biliary obstruction.

[0004] In the prior art, double - pigtail stents or self - draining biliary spiral stents are usually used for biliary support. For double - pigtail stents, the diameters of their two pigtails are the same, so there is no buffering when entering the biliary tract, and the overall length is generally long, making it impossible to be discharged from the body by itself. For self - draining biliary spiral stents, since the part in the bile duct cavity is a vertical structure, this design will increase the length of the stent and increase the difficulty during the process of the stent being discharged from the intestine. Therefore, it is found that both double - pigtail stents and self - draining biliary spiral stents have problems that are not conducive to the treatment of patients during the biliary support process. Therefore, this application provides a self - draining double - helix biliary stent to meet the needs. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a self - draining double - helix biliary stent to solve the problems in the prior art that usually double - pigtail stents or self - draining biliary spiral stents are used for biliary support. For double - pigtail stents, the diameters of their two pigtails are the same, so there is no buffering when entering the biliary tract, and the overall length is generally long, making it impossible to be discharged from the body by itself. For self - draining biliary spiral stents, since the part in the bile duct cavity is a vertical structure, this design will increase the length of the stent and increase the difficulty during the process of the stent being discharged from the intestine. Therefore, it is found that both double - pigtail stents and self - draining biliary spiral stents have problems that are not conducive to the treatment of patients during the biliary support process.

[0006] To solve the above - mentioned technical problem, the utility model provides the following technical solution: a self - draining double - helix biliary stent, comprising: a stent body, the stent body includes a connecting pipe, a first spiral pipe and a second spiral pipe; the connecting pipe is used for fixedly connecting the first spiral pipe and the second spiral pipe; the first spiral pipe is installed on one side of the connecting pipe and is used for draining bile; the second spiral pipe is installed on the side of the connecting pipe away from the first spiral pipe and is used for supporting the biliary tract, and is arranged such that the biliary tract squeezes the second spiral pipe to fix the stent body and prevent the entire stent body from entering the biliary tract cavity, so as to avoid the displacement of the stent body.

[0007] Preferably, the diameters of the first spiral tube are provided in two groups of 0.8 cm and 1.0 cm to match different incisions.

[0008] Preferably, the diameter of the second spiral tube is set to 1.5 cm so that the diameter of the second spiral tube is larger than that of the first spiral tube.

[0009] Preferably, the number of turns of the first spiral tube is set to 3 turns, 4 turns or 5 turns, and the number of turns of the second spiral tube is set to 2 turns.

[0010] Preferably, the length of the first spiral tube is less than 2 cm, the length of the connecting tube is 2 - 3 cm, and the length of the stent body is 4 - 5 cm.

[0011] Preferably, it further includes: a first marking coating located on the side of the connecting tube close to the first spiral tube for indicating that the first spiral tube enters the biliary tract cavity.

[0012] Preferably, it further includes: a second marking coating located on the side of the connecting tube close to the second spiral tube for indicating that the connecting tube and the first spiral tube enter the biliary tract cavity.

[0013] Preferably, it further includes: multiple groups of side holes evenly formed in the first spiral tube and the second spiral tube respectively to prevent the stent body from being blocked.

[0014] Preferably, both groups of marking coatings are made of an X-ray-impermeable coating material so that when performing X-ray detection, the part of the stent body entering the biliary tract cavity can be observed.

[0015] Preferably, the inside of the connecting tube, the first spiral tube and the second spiral tube are interconnected and are arranged such that objects in the biliary tract cavity are discharged after passing through the stent body.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects: 1. In the above solution, by providing two spiral tubes with different diameters, compared with the existing double-pigtail stents or self-draining biliary spiral stents, the spiral structures of the two spiral tubes help to better adapt to the physiological shape of the biliary tract, form a stable fixation, and avoid the risk that the stent with a vertical structure at one end in the prior art may pierce the intestinal wall. The setting of the self-draining double-spiral biliary stent provides convenience for subsequent removal of the stent. Specifically, while the first spiral tube is used for draining bile, it can be made into a spiral structure mainly to prevent it from easily slipping out of the biliary tract. At the same time, after automatically discharging into the intestinal cavity, due to the spiral structure, it can avoid damaging the intestine; the second spiral tube is made into a spiral structure. Firstly, it can prevent the whole stent from entering the bile duct and causing internal displacement of the stent. Secondly, because of its spiral structure, it can avoid damaging the intestine during the process of the stent being discharged from the intestine to the outside of the body.

[0017] 2. By setting two sets of marker coatings with different functions, it is convenient to identify under X-ray and observe under a microscope, so as to remind the user that when the first marker point appears, it indicates that the first spiral tube has entered the bile duct, and when the second marker point appears, it prompts the user to prepare whether to place the stent, avoiding the trouble caused by pushing the entire stent into the bile duct lumen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] And the drawings forming a part of the specification illustrate embodiments of the present disclosure, and together with the specification are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the second spiral tube in the present utility model.

[0021] [Reference Numerals]

[0022] 1. Stent body; 2. Connecting tube; 3. First spiral tube; 4. Second spiral tube; 5. First marker coating; 6. Second marker coating; 7. Side hole.

[0023] As shown in the figure, in order to clearly implement the structure of the embodiments of the present utility model, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present utility model to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following describes in detail a self-draining double-spiral bile duct stent provided by the present utility model in conjunction with the drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can also adopt other alternative methods for some well-known technologies; moreover, the drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present utility model.

[0025] Embodiment 1: As Figures 1 to 2As shown, an embodiment of the present utility model provides a self - draining double - helix biliary stent, including: a stent body 1, the stent body 1 includes a connecting pipe 2, a first helical pipe 3 and a second helical pipe 4; the connecting pipe 2 is used for fixedly connecting the first helical pipe 3 and the second helical pipe 4; the first helical pipe 3 is installed on one side of the connecting pipe 2 and is used for draining bile; the second helical pipe 4 is installed on the side of the connecting pipe 2 away from the first helical pipe 3 and is used for supporting the bile duct, and is arranged such that the bile duct squeezes the second helical pipe 4 to fix the stent body 1, preventing the entire stent body 1 from entering the bile duct cavity and causing the stent body 1 to shift; the first helical pipe 3 first enters the bile duct to support the bile duct wall, and after the second helical pipe 4 needs to be pushed into the bile duct later, the first helical pipe 3 stops supporting; and the stent body 1, the inner wall diameters of the pipes between the connecting pipe 2, the first helical pipe 3 and the second helical pipe 4 are the same, and the helical structures of the first helical pipe 3 and the second helical pipe 4 are of different sizes, that is, a plastic pipe is made into two - end helical structures.

[0026] The diameter of the first helical pipe 3 is set to 0.8 cm.

[0027] The diameter of the second helical pipe 4 is set to 1.5 cm, so that the diameter of the second helical pipe 4 is greater than that of the first helical pipe 3.

[0028] As Figures 1 to 2 shown, the number of helical turns of the first helical pipe 3 is set to 3 turns, 4 turns or 5 turns, and the number of helical turns of the second helical pipe 4 is set to 2 turns.

[0029] The length of the first helical pipe 3 is less than 2 cm, the length of the connecting pipe 2 is 2 cm, and the length of the stent body 1 is 4 - 5 cm; the total length of the stent body 1 is about 5 cm, that is, the sum of the lengths of the connecting pipe 2, the first helical pipe 3 and the second helical pipe 4 is 5 cm.

[0030] Embodiment two: As Figure 1 shown, it further includes: a first marking coating 5, located on the side of the connecting pipe 2 close to the first helical pipe 3, and is used to indicate that the first helical pipe 3 enters the bile duct cavity.

[0031] As Figure 1 shown, it further includes: a second marking coating 6, located on the side of the connecting pipe 2 close to the second helical pipe 4, and is used to indicate that the connecting pipe 2 and the first helical pipe 3 enter the bile duct cavity.

[0032] As Figures 1 to 2 shown, it further includes: multiple groups of side holes 7, which are respectively and evenly opened on the first helical pipe 3 and the second helical pipe 4 to prevent the stent body 1 from being blocked.

[0033] Both groups of marking coatings adopt coating materials that are impervious to X - rays, so that when performing X - ray detection, the part of the stent body 1 entering the bile duct cavity can be observed; the marking coatings can help doctors accurately judge the position of the stent under X - rays and ensure the treatment effect.

[0034] The connecting pipe 2, the first spiral pipe 3 and the second spiral pipe 4 are internally interconnected and are arranged such that the objects in the biliary tract cavity are discharged after passing through the stent body 1; the connecting pipe 2, the first spiral pipe 3 and the second spiral pipe 4 are internally interconnected, enabling the objects in the biliary tract cavity to pass through the stent body 1 smoothly and then be discharged, maintaining the normal function of the biliary tract. For example, when the biliary tract of a patient is obstructed due to a disease, after implanting this self-draining double-spiral biliary stent, bile can be smoothly discharged through the side holes 7 and the internally interconnected channels, relieving the biliary tract pressure and restoring the normal physiological function of the biliary tract.

[0035] Embodiment 3: Different from Embodiment 1, in this embodiment, the diameter of the first spiral pipe 3 is set to 1.0 cm, the length of the connecting pipe 2 is 3 cm, and the length of the stent body 1 is 5 cm.

[0036] For the technical solution provided by the present utility model, first, when the self-draining double-spiral biliary stent is implanted into the biliary tract, a doctor will select a first spiral pipe 3 (0.8 cm or 1.0 cm) with an appropriate diameter and a second spiral pipe 4 according to the specific conditions of the patient and connect them to both ends of the connecting pipe 2 respectively; when starting the operation, first, the first spiral pipe 3 is inserted into the biliary tract cavity. The operator irradiates X-rays and first discovers the first marking coating 5 on the side of the connecting pipe 2 close to the first spiral pipe 3, thus reminding the operator that the part of the first spiral pipe 3 has entered the biliary tract. Subsequently, the connecting pipe 2 is pushed into the biliary tract, and it is judged whether it is necessary to further insert the stent body 1 according to the patient's condition. By finding the second marking coating 6 on the side close to the second spiral pipe 4, the part of the stent entering the biliary tract cavity can be clearly displayed, facilitating the doctor to observe the position and state of the stent. The second spiral pipe 4 is located on the side of the connecting pipe 2 far from the first spiral pipe 3; when the second spiral pipe 4 enters the biliary tract, the biliary tract wall is propped up, and at the same time, the biliary tract wall squeezes the second spiral pipe 4. This squeezing effect enables the second spiral pipe 4 to be firmly supported in the biliary tract, thereby fixing the stent body 1 in an appropriate position; during the use of the stent, multiple groups of side holes 7 uniformly opened on the first spiral pipe 3 and the second spiral pipe 4 can ensure that substances such as bile can pass through smoothly, avoiding blockage of the stent body 1.

[0037] The present utility model covers any substitutions, modifications, equivalent methods and solutions made within the essence and scope of the present utility model. In order to enable the public to have a thorough understanding of the present utility model, specific details have been described in detail in the above preferred embodiments of the present utility model. However, those skilled in the art can fully understand the present utility model without these detailed descriptions. Additionally, in order to avoid unnecessary confusion to the essence of the present utility model, well-known methods, processes, procedures, components and circuits have not been described in detail.

[0038] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A self-arranging double-helix biliary stent, characterized in that, Comprising: A stent body (1), the stent body (1) comprising a connecting tube (2), a first spiral tube (3) and a second spiral tube (4); The connecting tube (2) is used for fixedly connecting the first spiral tube (3) and the second spiral tube (4); The first spiral tube (3), which is installed on one side of the connecting tube (2) and is used for draining bile; The second spiral tube (4), which is installed on the side of the connecting tube (2) away from the first spiral tube (3), is used for supporting the biliary tract, and is arranged such that the biliary tract squeezes the second spiral tube (4) to fix the stent body (1) and prevent the entire stent body (1) from entering the biliary tract cavity, so as to prevent the stent body (1) from shifting.

2. The self-arranging double-helix biliary stent according to claim 1, wherein The diameters of the first spiral tube (3) are provided in two groups of 0.8 cm and 1.0 cm to match different incisions.

3. The self - arranging double - helix biliary stent according to claim 2, wherein, The diameter of the second spiral tube (4) is set to 1.5 cm, so that the diameter of the second spiral tube (4) is larger than that of the first spiral tube (3).

4. The self-draining double helix biliary stent according to claim 1, wherein The number of spiral turns of the first spiral tube (3) is set to 3 turns, 4 turns or 5 turns, and the number of spiral turns of the second spiral tube (4) is set to 2 turns.

5. The self - arranging double - helix biliary stent according to claim 1, characterized in that, The length of the first spiral tube (3) is less than 2 cm, the length of the connecting tube (2) is 2 - 3 cm, and the length of the stent body (1) is 4 - 5 cm.

6. The self - arranging double - helix biliary stent according to claim 1, wherein, Further comprising: A first marking coating (5), which is located on the side of the connecting tube (2) close to the first spiral tube (3) and is used to indicate that the first spiral tube (3) enters the biliary tract cavity.

7. The self-arranging double-helix biliary stent according to claim 6, characterized in that, Further comprising: A second marking coating (6), which is located on the side of the connecting tube (2) close to the second spiral tube (4) and is used to indicate that the connecting tube (2) and the first spiral tube (3) enter the biliary tract cavity.

8. The self - arranging double - helix biliary stent according to claim 1, characterized in that, Further comprising: Multiple groups of side holes (7), which are respectively and evenly formed in the first spiral tube (3) and the second spiral tube (4) to prevent the stent body (1) from being blocked.

9. The self - arranging double - helix biliary stent according to claim 7, characterized in that, Both of the two groups of marking coatings are made of an X-ray impermeable coating material, so that when performing X-ray detection, the part of the stent body (1) entering the biliary tract cavity can be observed.

10. The self - arranging double - helix biliary stent according to claim 1, characterized in that, The inside of the connecting tube (2), the first spiral tube (3) and the second spiral tube (4) communicate with each other, and are arranged such that the objects in the biliary tract cavity are discharged after passing through the stent body (1).

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