Biliary tract stent and delivery system
By designing an integrated biliary stent and delivery system, the problem of difficulty in adjusting the release position of the biliary stent was solved, enabling convenient position adjustment and retrieval, and reducing the difficulty of the operation.
Patent Information
- Application Number
- CN202520247596.9
- 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 procedure.
A biliary stent was designed, comprising an integrally formed 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. It is equipped with a flared mouth and a traction part. In conjunction with a biliary stent delivery system, the stent is fixed by a stent fixation mechanism to achieve position adjustment and retrieval.
It facilitates the adjustment and retrieval of the biliary stent's release position during transport, reducing placement difficulty and improving the ease and safety of the procedure.
Smart Images
Figure CN223759942U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and in particular to a biliary stent and delivery system. 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 and delivery system that can solve the aforementioned technical problems.
[0007] To achieve the above objectives, the present invention provides a technical solution: a biliary stent, the biliary stent comprising:
[0008] The bracket body is integrally formed, and 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] Optionally, the first support tube body is provided with a flared opening opposite to the second support tube body.
[0010] Optionally, the second stent tube body is provided with a traction part at one end opposite to the first stent tube body. The traction part is used for a set traction device to pick up the biliary stent and retrieve it.
[0011] Optionally, the pulling part is a ring that is fixedly installed at the end of the second support tube.
[0012] 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 duct, and the flared end is inserted into the gallbladder. The second stent tube extends into the common bile duct.
[0013] Optionally, an anticoagulant coating is provided on the stent body.
[0014] To achieve the above objectives, another technical solution adopted by this utility model is to provide a biliary stent delivery system, which includes a biliary stent delivery device and a biliary stent as described above.
[0015] Optionally, the biliary stent delivery device includes:
[0016] An outer tube, a push tube, and an inner tube are nested together in sequence. The outer tube is fitted over the inner tube, and the push tube is fitted over the inner tube and located between the outer tube and the inner tube. The biliary stent is disposed between the outer tube and the inner tube.
[0017] The inner tube has a guide head connected to its head, the biliary stent is sleeved on the inner tube and located on one side of the guide head, and the push tube extends to the vicinity of the guide head and abuts against the side of the biliary stent away from the guide head.
[0018] Optionally, the biliary stent delivery device is further provided with a stent fixing mechanism, which is used to fix the biliary stent when it is not released.
[0019] The stent fixing mechanism includes a fixing ring and a pull wire, wherein the fixing ring is stacked on top of the biliary stent; and the pull wire is inserted between the fixing ring and the biliary stent.
[0020] This utility model provides a biliary stent and delivery system. Using the above-mentioned biliary stent, the size of the first stent tube can be matched with the size of the gallbladder duct, and the size of the second stent tube can be matched with the size of the common bile duct, thereby reducing the size of the biliary stent. Furthermore, by integrally molding the first stent tube and the second stent tube, the biliary stent can be easily retrieved at any time during the release process through the delivery device, thus facilitating the adjustment of the release position of the entire biliary stent and reducing the difficulty of biliary stent placement. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of an embodiment of a biliary stent provided in this application;
[0022] Figure 2 yes Figure 1 The diagram shows the placement of the biliary stent.
[0023] Figure 3 This is a schematic diagram of an embodiment of a biliary stent delivery system provided in this application;
[0024] Figure 4 yes Figure 3 The diagram shows the connection structure of the stent fixation mechanism in the biliary stent delivery system. Detailed Implementation
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] Please see Figures 1-2 , Figure 1 This is a schematic diagram of an embodiment of a biliary stent provided in this application; Figure 2 yes Figure 1 The diagram shows the placement of the biliary stent.
[0032] The biliary stent 10 includes: an integrally formed 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.
[0033] 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.
[0034] Please refer to further information. Figure 1 .
[0035] 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.
[0036] The flared opening 101 is also integrally formed with the first support tube 111.
[0037] 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.
[0038] The traction part 102 is a ring that is fixedly installed at the end of the second support tube 112.
[0039] 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.
[0040] 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.
[0041] Furthermore, preferably, an anticoagulant coating is also provided on the stent body 110 to avoid the problem of bile flow being blocked at the common hepatic duct by the biliary stent 10 and thrombus coagulation forming on the surface of the biliary stent 10.
[0042] Furthermore, based on the same inventive concept, this application also provides a biliary stent delivery system. Please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of an embodiment of a biliary stent delivery system provided in this application.
[0043] The biliary stent delivery system 20 includes a biliary stent delivery device 210 and a biliary stent 10 as described above. The biliary stent delivery device 210 is used to place the biliary stent 10 and position it along a predetermined cavity to a predetermined location in the biliary system.
[0044] The biliary stent delivery device 210 includes an outer tube 211, a push tube 212, and an inner tube 213 nested together in sequence. The outer tube 211 is fitted inside the inner tube 213, and the push tube 212 is fitted inside the inner tube 213 and located between the outer tube 211 and the inner tube 213. The biliary stent 10 is disposed between the outer tube 211 and the inner tube 213.
[0045] The inner tube 213 has a guide head 214 connected to its tip. The biliary stent 10 is fitted onto the inner tube 213 and located on one side of the guide head 214. The push tube 212 extends to the vicinity of the guide head 214 and abuts against the side of the biliary stent 10 away from the guide head 214. The inner tube 213 has a channel through which a guide wire can pass, and the guide head 214 can be moved to a predetermined position guided by the guide wire.
[0046] In this embodiment, the biliary stent 10 can be guided by the guide head 214 along a predetermined cavity, and then exit the duodenum, pass through the common bile duct, and enter the cystic duct. The guide head 214 can also enter the gallbladder.
[0047] By fixing the positions of the push tube 212 and the inner tube 213, and pulling the outer tube 211 backward, the biliary stent 10 can be gradually exposed to the outer tube 211, thereby releasing the biliary stent 10. The push tube 212 serves to abut against the rear end of the biliary stent 10, thus fixing its position and preventing the biliary stent 10 from shifting backward when the outer tube 211 is pulled backward.
[0048] Please refer to Figure 4 , Figure 4 yes Figure 3 The diagram shows the connection structure of the stent fixation mechanism in the biliary stent delivery system.
[0049] The biliary stent delivery device 210 is also provided with a stent fixing mechanism 215, which is used to fix the biliary stent 10 when it is not released. The stent fixing mechanism 215 includes a fixing ring 2151 and a pull wire 2152. The fixing ring 2151 is stacked with the biliary stent 10. The pull wire 2152 is inserted between the fixing ring 2151 and the biliary stent 10.
[0050] The fixing ring 2151 can be stacked with the traction part 102 at the end of the biliary stent 10. The pull wire 2152 is inserted in the space between the fixing ring 2151 and the traction part 102. The fixing is achieved by coupling the pull wire 2152, the fixing ring 2151 and the traction part 102. The other end of the pull wire 2152 extends to the end away from the guide head 214. By pulling the pull wire 2152, the fixing ring 2151 and the biliary stent 10 can be separated and fixed, thereby realizing the separation of the biliary stent 10 and the fixing ring 2151.
[0051] The fixing ring 2151 can be fixedly installed at the end of the push tube 212.
[0052] When the biliary stent 10 is positioned, it can be separated from the fixing ring 2151, and then the outer tube 211, the push tube 212, and the inner tube 213 can be withdrawn. The biliary stent 10 can then establish a temporary surgical channel from the gallbladder, cystic duct, common bile duct to the duodenum.
[0053] After the surgery is completed, the biliary stent 10 can be pulled back by grabbing the traction part 102 through the grabbing mechanism.
[0054] In summary, this application provides a biliary stent and delivery system. Using the above-mentioned biliary stent, the size of the first stent tube can be matched with the size of the gallbladder duct, and the size of the second stent tube can be matched with the size of the common bile duct, thereby reducing the size of the biliary stent. Furthermore, by integrally molding the first and second stent tubes, the biliary stent can be easily retrieved at any time during the release process via the delivery device, thus facilitating the adjustment of the release position of the entire biliary stent and reducing the difficulty of biliary stent placement.
[0055] 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, characterized by, The biliary tract stent comprises: a one-piece stent body comprising a first stent tube and a second stent tube connected together, the first stent tube having an outer diameter smaller than that of the second stent tube.
2. The biliary tract stent of claim 1, wherein the first stent tube is provided with a flared end away from the second stent tube.
3. The biliary tract stent of claim 2, wherein the second stent tube is provided with a pulling portion at an end away from the first stent tube, the pulling portion being used for picking up by a set of pulling equipment to recycle the biliary tract stent.
4. The biliary tract stent of claim 3, wherein the pulling portion is a ring body fixedly installed at the end of the second stent tube.
5. The biliary tract stent of claim 2, wherein the stent body is woven by connecting wires, and the tubes of the first stent tube and the second stent tube are both in a mesh shape, one side of the first stent tube being used for being arranged in the cystic duct, and the flared end being inserted into the gallbladder, and the second stent tube extending into the common bile duct.
6. The biliary tract stent of any one of claims 1-5, wherein an anticoagulant coating is arranged on the stent body.
7. A biliary stent delivery system characterized by, The biliary tract stent delivery system comprises a biliary tract stent delivery device and the biliary tract stent of any one of claims 1-6.
8. The biliary tract stent delivery system of claim 7, wherein the biliary tract stent delivery device comprises: an outer tube, a push tube and an inner tube nested in sequence, the outer tube being nested on the inner tube, the push tube being nested on the inner tube and located between the outer tube and the inner tube; and the biliary tract stent being arranged between the outer tube and the inner tube; wherein a guide head is connected to the head end of the inner tube, the biliary tract stent is nested on the inner tube and located on the side of the guide head, and the push tube extends to the vicinity of the guide head and abuts against the side of the biliary tract stent away from the guide head.
9. The biliary tract stent delivery system of claim 8, wherein a stent fixing mechanism is further arranged in the biliary tract stent delivery device, the stent fixing mechanism being used for fixing the biliary tract stent when the biliary tract stent is not released; the stent fixing mechanism comprises a fixing ring and a pull wire, the fixing ring being nested with the biliary tract stent; and the pull wire being inserted between the fixing ring and the biliary tract stent.