Biliary tract stent with covering film
By designing a covered biliary stent, the problem of difficulty in adjusting the placement of biliary stents was solved, providing an easy-to-adjust, non-invasive surgical channel and reducing the difficulty and risk of surgery.
Patent Information
- Application Number
- CN202520247617.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-14
AI Technical Summary
The placement of existing biliary stents during delivery to the gallbladder is difficult to adjust, increasing the complexity of the surgery. Furthermore, current surgeries for treating gallbladder stones and intrahepatic bile duct stones are invasive procedures and carry risks.
Design a biliary stent with a membrane, comprising an integrally formed stent body and a membrane. The stent body is composed of a first stent tube and a second stent tube. The outer diameter of the first stent tube is smaller than that of the second stent tube. A channel is provided in the connection area. An opening is provided on the membrane. The stent body is in the shape of a mesh tube. The stent tube is matched with the cystic duct and the common bile duct. The release position can be easily adjusted by a delivery device.
It facilitates adjusting the release position of the biliary stent during transport, reduces placement difficulty, provides a non-invasive temporary channel, and reduces surgical risks.
Smart Images
Figure CN223759943U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and more particularly to a biliary stent with a membrane. Background Technology
[0002] Gallstones refer to the formation of stones in the biliary system, including the gallbladder or hepatic bile ducts. They mainly include gallbladder stones, common bile duct stones, and intrahepatic and extrahepatic bile duct stones. Common bile duct stones and extrahepatic bile duct stones have more clinical treatment options and are technically mature, allowing for stone removal via laparoscopy or endoscopy. However, for gallbladder stones and intrahepatic bile duct stones, due to the structural limitations of the cystic duct and intrahepatic bile ducts, treatment options are relatively limited, and current clinical stone removal methods are all invasive surgical procedures.
[0003] For gallstones, the cystic duct has a folded structure, making it difficult for a choledochoscope to pass through, thus preventing non-invasive endoscopic stone removal. Usually, the gallbladder is removed laparoscopically, or the gallbladder is opened laparoscopically for stone removal, or NOTES (Natural Orifice Endoscopic Surgery) is performed endoscopically to remove the stones. All of these procedures are invasive and carry certain risks.
[0004] Intrahepatic bile ducts, due to their deep location and small diameter, especially when combined with intrahepatic bile duct stenosis, often lack an effective passage for endoscopy to perform lithotripsy and stone removal. Current practice involves placing a biliary stent, which passes through the duodenal papilla, common bile duct, cystic duct, spiral fold, and cystic neck to enter the gallbladder, creating a temporary passage between the gallbladder and the duodenal papilla. Surgical instruments are then placed through this temporary passage for subsequent procedures.
[0005] However, the deployment position of existing biliary stents during delivery to the gallbladder is difficult to adjust, which increases the difficulty of the procedure. Utility Model Content
[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a biliary stent with a membrane, which can solve the aforementioned technical problems.
[0007] To achieve the above objectives, the present invention provides a technical solution as follows: a biliary stent with a membrane, the biliary stent comprising:
[0008] The bracket body is integrally formed and covered with a film. The bracket body includes a first bracket tube and a second bracket tube connected to each other. The outer diameter of the first bracket tube is set to be smaller than the outer diameter of the second bracket tube.
[0009] The connection area between the first stent tube and the second stent tube has a channel through which tissue fluid can pass.
[0010] Optionally, the coating surface has multiple openings, the support body is in the shape of a mesh tube, and the size of each opening does not exceed the mesh size of the support body.
[0011] Optionally, the support body is provided with an opening area, and the film has multiple openings in the area corresponding to the opening area;
[0012] The opening area covers the connection between the first support tube and the second support tube, and in the axial direction of the support body, the opposite ends of the opening area extend into the first support tube and the second support tube, respectively; the distance between the edge of the opening area and the connection between the first support tube and the second support tube is not less than 1 cm.
[0013] Optionally, the support body is provided with an opening area, which is not covered by the film;
[0014] The opening area covers the connection between the first support tube and the second support tube, and the two ends of the opening area extend into the first support tube and the second support tube respectively in the axial direction of the support body; the distance between the edge of the opening area and the connection between the first support tube and the second support tube is not less than 1 cm.
[0015] Optionally, the second stent tube body is provided with a traction part at one end away from the first stent tube body. The traction part is used for a set traction device to pick up the biliary stent and retrieve it.
[0016] The pulling part is a ring that is fixedly installed at the end of the second support tube.
[0017] Optionally, the stent body is formed by braiding connected wires, and the tubes of the first stent tube and the second stent tube are both mesh-like. One side of the first stent tube is used to be placed in the gallbladder tube, and the flared end is inserted into the gallbladder. The second stent tube extends into the common bile duct.
[0018] This invention provides a membrane-covered biliary stent. The biliary stent's first stent tube is sized to match the cystic duct, and its second stent tube is sized to match the common bile duct. By integrally molding the first and second stent tubes, the biliary stent can be easily retrieved during deployment via a delivery device, facilitating adjustment of its placement and reducing placement difficulty. Furthermore, the channel at the connection point between the first and second stent tubes corresponds to the common hepatic duct, allowing tissue fluid from the common hepatic duct to pass through the biliary stent and into the common bile duct. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of an embodiment of a biliary stent with a membrane provided in this application;
[0020] Figure 2 yes Figure 1 The diagram shows the placement of the biliary stent.
[0021] Figure 3 yes Figure 1 A schematic diagram of another embodiment of the biliary stent is shown.
[0022] Figure 4 yes Figure 1 A schematic diagram of another embodiment of the biliary stent is shown. Detailed Implementation
[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0029] Please see Figures 1-2 , Figure 1 This is a schematic diagram of an embodiment of a biliary stent with a membrane provided in this application; Figure 2 yes Figure 1 The diagram shows the placement of the biliary stent.
[0030] The biliary stent 10 includes: an integrally formed stent body 110 covering a membrane (not shown in the figure) of the stent body 110, the stent body 110 including a first stent tube 111 and a second stent tube 112 connected to each other, the outer diameter of the first stent tube 111 being set to be smaller than the outer diameter of the second stent tube 112.
[0031] The connection area between the first stent tube 111 and the second stent tube 112 has a channel through which tissue fluid can pass.
[0032] In this embodiment, the end of the first stent tube 111 away from the second stent tube 112 can be inserted into the gallbladder, and the end of the second stent tube 112 away from the first stent tube 111 can extend into the common bile duct, thereby forming a temporary channel from the common bile duct to the gallbladder. The size of the first stent tube 111 is smaller than that of the second stent tube 112, and the size of the first stent tube 111 matches the size of the cystic duct. The size of the second stent tube 112 matches the size of the common bile duct. By integrally molding the first stent tube 111 and the second stent tube 112, the biliary stent 10 can be easily retrieved during its release via the delivery device, facilitating adjustments to its release position and reducing the difficulty of placement. Furthermore, the channel in the connection area between the first stent tube 111 and the second stent tube 112 can correspond to the common hepatic duct, allowing tissue fluid from the common hepatic duct to pass through the biliary stent 10 and enter the common bile duct.
[0033] Furthermore, in this embodiment, the film surface is provided with a plurality of openings 11, the support body is in the shape of a mesh tube, and the size of each opening 11 does not exceed the mesh of the support body.
[0034] Please see Figure 3 , Figure 3 yes Figure 1 A schematic diagram of another embodiment of the biliary stent is shown.
[0035] In this embodiment, the support body 110 is provided with an opening area A, and the film is provided with a plurality of openings 11 in the area corresponding to the opening area A;
[0036] The opening area A covers the connection between the first support tube 111 and the second support tube 112, and in the axial direction of the support body 110, the two opposite ends of the opening area A extend into the first support tube 111 and the second support tube 112 respectively; the distance between the edges of the opening area A and the connection between the edges is not less than 1 cm.
[0037] Alternatively, in some other embodiments, please refer to Figure 4 , Figure 4 yes Figure 1 The diagram shows another embodiment of the biliary stent. The stent body 110 has an opening region A, which is not covered by a membrane. Similarly, the opening region A covers the connection between the first stent tube 111 and the second stent tube 112, and along the axial direction of the stent body 110, the two opposite ends of the opening region A extend into the first stent tube 111 and the second stent tube 112, respectively. The distance between the edges of the opening region A and the connection points of the edges is not less than 1 cm.
[0038] Please refer to further information. Figure 1 .
[0039] In this embodiment, a flared opening 101 is provided on the first stent tube 111 away from the second stent tube 112. The cross-sectional area of the flared opening 101 gradually increases in the direction away from the first stent tube 111. The flared opening 101 can be installed in the gallbladder. When the flared opening 101 is released and opened, it can be locked at the connection between the gallbladder and the cystic duct, thereby improving the overall stability of the biliary stent 10.
[0040] The flared opening 101 is also integrally formed with the first support tube 111.
[0041] In this embodiment, a traction part 102 is provided at the end of the second stent tube 112 away from the first stent tube 111. The traction part 102 is used for a set traction device to pick up the biliary stent 10 so as to retrieve it.
[0042] The traction part 102 is a ring that is fixedly installed at the end of the second support tube 112.
[0043] In this embodiment, the stent body 110 is formed by braiding the connecting wires, and the tubes of the first stent tube 111 and the second stent tube 112 are both mesh-like. One side of the first stent tube 111 is used to be placed in the gallbladder tube, and the flared end 101 is inserted into the gallbladder. The second stent tube 112 extends into the common bile duct.
[0044] In this embodiment, after the biliary stent 10 is placed in place, the biliary stent 10 can not block the exchange of tissue fluid between the common hepatic duct and the common bile duct. The exchange of tissue fluid between the common hepatic duct and the common bile duct can be carried out through the mesh of the stent body 110.
[0045] Furthermore, preferably, an anticoagulant coating is provided on the stent body 110 to avoid tissue adhesion between the biliary stent 10 and the gallbladder, cystic duct and common bile duct, thus ensuring that the biliary stent 10 can be removed later.
[0046] In summary, this application provides a covered biliary stent. The aforementioned biliary stent, by matching the size of the first stent tube to the size of the cystic duct and the size of the second stent tube to the size of the common bile duct, and by integrally molding the first and second stent tubes, allows for easy retrieval of the biliary stent during deployment via a delivery device. This facilitates adjustment of the stent's deployment position and reduces the difficulty of placement. Furthermore, the channel in the connection area between the first and second stent tubes can correspond to the common hepatic duct, allowing tissue fluid from the common hepatic duct to pass through the biliary stent and enter the common bile duct.
[0047] The above embodiments are merely illustrative examples of the present invention and not all embodiments. The present invention may also be implemented in other specific ways or forms without departing from the spirit or essential characteristics of the present invention. Therefore, the described embodiments should be considered illustrative rather than limiting in any respect. The scope of the present invention should be defined by the appended claims, and any variations equivalent to the intent and scope of the claims should also be included within the scope of the present invention.
Claims
1. A biliary stent having a coating, characterized by, The biliary tract stent comprises: An integrally formed stent body and a covering film covering the stent body, the stent body comprising a first stent tube and a second stent tube connected together, the outer diameter of the first stent tube being set to be smaller than the outer diameter of the second stent tube; Wherein, the connection area of the first stent tube and the second stent tube is provided with a channel for tissue fluid to pass through.
2. The biliary tract stent of claim 1, wherein The surface of the covering film is provided with a plurality of openings, and the stent body is in the form of a mesh tube, the size of each opening not exceeding the mesh size of the stent body.
3. The biliary tract stent of claim 1, wherein The stent body is provided with an opening area, and the covering film is provided with a plurality of openings in the area corresponding to the opening area; The opening area covers the connection of the first stent tube and the second stent tube, and in the axial direction of the stent body, the opposite ends of the opening area extend into the first stent tube and the second stent tube, respectively; the distance between the edge of the opening area and the connection of the first stent tube and the second stent tube is not less than 1 cm.
4. The biliary tract stent of claim 1, wherein The stent body is provided with an opening area, and the opening area is not covered by the covering film; Wherein, the opening area covers the connection of the first stent tube and the second stent tube, and in the axial direction of the stent body, the opposite ends of the opening area extend into the first stent tube and the second stent tube, respectively; the distance between the edge of the opening area and the connection of the first stent tube and the second stent tube is not less than 1 cm.
5. The biliary tract stent of any one of claims 1-4, wherein The end of the second stent tube away from the first stent tube is provided with a pulling part, and the pulling part is used for picking up by a set of pulling equipment to recycle the biliary tract stent; Wherein, the pulling part is a ring body fixedly installed at the end of the second stent tube.
6. The biliary tract stent of claim 5, wherein The stent body is woven by connecting wires, and the tubes of the first stent tube and the second stent tube are in the form of a mesh, the first stent tube is used for being arranged in the cystic duct, and the trumpet is inserted into the gallbladder, and the second stent tube extends into the common bile duct.