Three-blade-surface support used for ERCP
By designing a trilobular stent used for ERCP, the problems of prone to bile sludge obstruction and insufficient bile excretion in the bile tract in the prior art are solved, and smooth bile excretion and stable fixation of the stent are achieved, effectively preventing reflux and infection.
Patent Information
- Application Number
- CN202421142860.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The plastic stent used for existing ERCP surgery is easily blocked by bile sludge in the bile tract. The lack of lateral hole design leads to insufficient bile excretion, which poses the risk of slippage and poor anti-reflux effect.
A three-leaf stent used for ERCP surgery is designed, including a stent body and a drainage tube. The stent body is composed of a guide wire through hole, three foliar surfaces and a stent fixing part. A groove is formed between the adjacent two foliar surfaces. The foliar surface is equipped with an expansion part to improve the stability and fixation of the stent. The drainage tube is a pigtail-type spiral curved structure, and the tube wall is equipped with a drainage hole to promote bile discharge.
The trilobular stent increases the bile flow space, improves bile excretion efficiency, reduces the risk of bile sludge obstruction, enhances the stability and fixation of the stent, and effectively prevents reflux and infection.
Smart Images
Figure CN222777391U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of medical instruments, in particular to a three-leaf stent used in ERCP. Background Art
[0002] Endoscopic retrograde cholangiopancreatography (ERCP) is an advanced endoscopic minimally invasive technique that is commonly used for the examination, diagnosis and treatment of bile duct and pancreatic diseases. For hilar cholangiocarcinoma, coated metal stents cannot be used because they will block the contralateral bile duct and cause severe infection. Ordinary plastic stents lack side holes and are often not drained sufficiently after placement, which makes them prone to infection. In ERCP surgery, it is often found that in patients with multiple stones in the bile duct, the inside of the plastic stent has been blocked by bile sludge for more than half a year, but the patients still have no symptoms of bile duct infection. During surgery, it can be found that bile flows out along the side of the stent. If bile cannot flow out through the edge of the stent, infection is inevitable. The current plastic stents have the following disadvantages: poor tissue compatibility, easy formation of bile sludge blocking the stent; lack of side hole design, especially in hilar tumors, even with multiple side hole design, there is still a problem of bile sludge blocking, which is not conducive to the smooth excretion of bile; there is a risk of slippage; the anti-reflux effect is not good.
[0003] Therefore, it is necessary to design a three-leaf stent for use in ERCP to solve the above problems. Utility Model Content
[0004] The utility model aims to overcome the deficiencies in the prior art and provide a three-leaf stent used in ERCP.
[0005] In order to achieve the above objectives, the technical solution of the utility model is:
[0006] A three-blade stent used in ERCP surgery includes a stent body and a drainage tube. The stent body includes a guidewire through hole and three blades. The three blades are arranged at intervals along the peripheral direction of the guidewire through hole. A groove for bile to pass through is formed between two adjacent blades. The blades include a first portion and a second portion. The first portion is provided with two groups, and the two groups of first portions are respectively located at both ends of the second portion. The first portion is provided with a stent fixing portion extending in a direction away from the guidewire through hole to expand the width of the first portion. The stent fixing portion is used to fix the position of the three-blade stent in the patient's body. The drainage tube is fixedly arranged at one end of the guidewire through hole.
[0007] Preferably, two corners of the bracket fixing portion away from the guide wire through hole are rounded structures, and the side surfaces of the bracket fixing portion away from the guide wire through hole are arc-shaped surfaces.
[0008] Preferably, the drainage tube is a pigtail-type spiral curved structure, and a plurality of drainage holes are provided through the wall of the drainage tube.
[0009] Preferably, the diameter of the drainage tube is larger than the diameter of the guide wire through hole.
[0010] Preferably, the side surfaces of all the stent fixing parts away from the guide wire through hole are located on the same cylindrical surface, and the diameter of the cylindrical surface is the diameter of the three-leaf stent.
[0011] Preferably, the maximum circumscribed circle diameter formed by the outer edge of the cross section of the stent body in the width direction is one of 6 mm, 7 mm, 8.5 mm and 12 mm.
[0012] Preferably, the length of the stent body ranges from 5 to 12 cm.
[0013] Preferably, the bracket body is an integrally formed part.
[0014] Preferably, the bracket body is a silicone bracket with a smooth surface.
[0015] Preferably, the drainage tube is a flexible tube.
[0016] Compared with the prior art, the beneficial effects of the utility model are:
[0017] (1) The three-blade stent used in the ERCP technique proposed in the utility model adopts a three-blade support narrow structure, which has good stability and support force. The groove formed between two adjacent blades allows a larger space for bile to flow during excretion, which is conducive to the smooth excretion of bile into the intestine. A pigtail-shaped drainage tube is also provided at one end of the stent body. The drainage tube and its drainage hole can effectively drain bile, and effectively prevent reflux, avoid bile mud blockage, and prevent infection.
[0018] (2) The three-leaf stent used in the ERCP technique proposed in the utility model is made of silicone material, which has good biocompatibility, reduces stimulation to surrounding tissues, and reduces the risk of infection and rejection; a stent fixing part is also provided on the leaf surface, which adopts a blunt design and has no risk of cutting tissues and causing damage, so as to further improve the stability of the stent in the bile duct and reduce the risk of slippage.
[0019] (3) The three-leaf stent used in the ERCP technique proposed in the present invention is also provided with a guide wire through hole so as to facilitate operation through a guide wire, thereby improving the convenience and flexibility of operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the overall structure of the three-leaf stent used in the ERCP technique proposed in the embodiment of the present application;
[0021] Figure 2A side view of a stent body of a three-leaf stent used in the ERCP technique proposed in an embodiment of the present application;
[0022] Figure 3 A top view of a stent body of a three-leaf stent used in the ERCP technique proposed in an embodiment of the present application;
[0023] Figure 4 A schematic diagram of the placement of a three-leaf stent used in the ERCP technique proposed in an embodiment of the present application;
[0024] Figure 5 A schematic diagram of a three-leaf stent after placement for use in the ERCP procedure proposed in an embodiment of the present application;
[0025] Figure numerals: 1. stent body; 11. guide wire through hole; 12. blade surface; 121. first part; 122. second part; 123. stent fixing part; 1231. rounded corner; 1232. arc surface; 2. drainage tube; 21. drainage hole; 3. guide wire; 4. bile duct; 5. duodenum. DETAILED DESCRIPTION
[0026] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The drawings of the present invention are only for illustration to make it easier to understand the present invention, and the specific proportions can be adjusted according to design requirements. The upper and lower relationships of the relative elements and the definitions of the front and back sides in the figures described in the text should be understood by those skilled in the art to refer to the relative positions of the components, so they can all be flipped to present the same components, which should all fall within the scope disclosed in this specification.
[0027] refer to Figures 1 to 5 The embodiment of the present application proposes a three-blade stent used in ERCP, including a stent body 1 and a drainage tube 2. The stent body 1 includes a guide wire through hole 11 and three blades 12. The guide wire 3 passes through the guide wire through hole 11, which is convenient for operation and improves the flexibility and convenience of operation. The three blades 12 are arranged at intervals along the peripheral direction of the guide wire through hole 11, and a groove for bile to pass through is formed between two adjacent blades 12. The three-blade design has good mechanical angle support and larger space, which is conducive to supporting the narrow part of the bile duct 4, draining bile, ensuring the smooth excretion of bile into the intestine, and preventing infection; specifically, refer to Figure 1 and Figure 2The blade surface 12 includes a first portion 121 and a second portion 122. The first portion 121 is provided with two groups, and the two groups of first portions 121 are respectively located at the two ends of the second portion 122. The first portion 121 is provided with a stent fixing portion 123 extending in a direction away from the guide wire through hole 11 to expand the width of the first portion 121. The stent fixing portion 123 is used to fix the position of the three-blade stent in the patient's body to improve the stability of the stent in the bile duct 4 and reduce the risk of slippage; the drainage tube 2 is fixedly arranged at one end of the guide wire through hole 11. The drainage tube 2 is a pigtail-type spiral bending structure, which makes it difficult for the liquid in the intestinal cavity to enter the bile duct 4 and is convenient for removing the stent when taking it out; a plurality of drainage holes 21 are provided on the wall of the drainage tube 2, which are conducive to the discharge of bile, and the diameter of the drainage tube 2 is larger than the diameter of the guide wire through hole 11 to prevent backflow and ensure that the bile in the groove formed between the two adjacent blade surfaces 12 and the bile in the guide wire through hole 11 are discharged smoothly.
[0028] In a specific embodiment, reference Figure 2 and Figure 3 The two corners on the stent fixing portion 123 away from the guide wire through hole 11 are rounded corners 1231, and the side of the stent fixing portion 123 away from the guide wire through hole 11 is an arcuate surface 1232. The design of the rounded corners 1231 and the arcuate surface 1232 can prevent the stent fixing portion 123 from cutting the bile duct tissue and prevent slipping, thereby increasing the stability of the three-leaf stent through the stent fixing portion 123.
[0029] In a specific embodiment, the diameter of the maximum circumscribed circle formed by the outer edge of the cross section of the stent body 1 in the width direction is one of 6 mm, 7 mm, 8.5 mm, and 12 mm. For example, a three-leaf stent with a diameter of 12 mm can be used for patients with significantly thickened common bile duct; the length of the stent body 1 ranges from 5 to 12 cm. For example, the length of the stent body 1 can be designed to be 5 cm, 7 cm, 10 cm, and 12 cm according to the length of the biliary system.
[0030] In a specific embodiment, the side surfaces of all the stent fixing portions 123 that are away from the guide wire through hole 11 are located on the same cylindrical surface, and the diameter of the cylindrical surface is the diameter of the three-leaf stent.
[0031] In a specific embodiment, the stent body 1 is an integrally molded part made of medical-grade silicone material with good biocompatibility. It has a smooth surface, elasticity and support strength. It can not only reduce the stimulation to the surrounding tissues and facilitate the smooth excretion of bile, but also not easily form bile sludge to block the bile duct 4, thereby reducing the risk of infection and rejection, and ensuring the long-term stability of the three-leaf stent; further, the drainage tube 2 is a flexible tube, so that the guide wire 3 can pass through the drainage tube 2 and then into the guide wire through hole 11, and the guide wire 3 guides the push tube to place the stent body 1 in the bile duct 4.
[0032] The three-leaf stent used in the ERCP procedure proposed in this application is further described with a specific working process:
[0033] refer to Figure 4 The guide wire 3 passes through the drainage tube 2 and then passes through the guide wire through hole 11. The guide wire 3 guides the push tube to push the stent body 1 into the bile duct 4. The drainage tube 2 is located in the duodenum 5. Specifically, when the stent body 1 is pushed into the bile duct 4, the stent fixing portion 123 located at one end of the second portion 122 is supported in the narrow section of the bile duct 4, and the stent fixing portion 123 located at the other end of the second portion 122 is supported at the nipple sphincter, so that the stent body 1 is fixed in the narrow section of the bile duct 4 and has an anti-slip effect; refer to Figure 5 After the guide wire 3 is pulled out and the push tube is withdrawn, the drainage tube 2 is bent into a pigtail structure.
[0034] The three-leaf stent used in ERCP proposed in the embodiment of the present application is a biliary plastic stent suitable for most biliary system conditions, especially when the portal bile duct is blocked and multiple stents are needed for drainage. It has the following advantages: First, the three-leaf design forms a groove for bile to pass through between two adjacent blades 12, which is sufficient for drainage and not easy to be blocked; second, the stent fixing part 123 is a blunt design with rounded corners 1231 and curved surface 1232, without cutting tissue and risk of injury; third, a multi-wing anti-slip design is provided at the head and tail of the stent body 1, and the stent body 1 is fixed in the bile duct 4 through multiple stent fixing parts 123 to support stenosis, and the three-leaf stent has good stability and anti-slip; fourth, the silicone material and smooth surface design have better tissue compatibility and are not easy to form bile mud and block; fifth, the drainage tube 2 is a pigtail structure design that effectively prevents reflux.
[0035] The above embodiments are only used to further illustrate the technical solution of the utility model, but the utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model fall within the protection scope of the technical solution of the utility model.
Claims
1. A three-leaf stent for use in ERCP, characterized in that: It includes a stent body and a drainage tube, the stent body includes a guidewire through hole and three blades, the three blades are arranged at intervals along the circumferential direction of the guidewire through hole, and a groove for bile to pass through is formed between two adjacent blades, the blades include a first part and a second part, the first part is provided with two groups, and the two groups of first parts are respectively located at both ends of the second part, the first part is provided with a stent fixing part extending in a direction away from the guidewire through hole to expand the width of the first part, and the stent fixing part is used to fix the position of the three-blade stent in the patient's body; the drainage tube is fixedly arranged at one end of the guidewire through hole.
2. The three-leaf stent used in ERCP according to claim 1, characterized in that: The two corners of the bracket fixing part away from the guide wire through hole are rounded structures, and the side surface of the bracket fixing part away from the guide wire through hole is an arc surface.
3. The three-leaf stent used in ERCP according to claim 1, characterized in that: The drainage tube is a pigtail type spiral curved structure, and a plurality of drainage holes are provided on the tube wall of the drainage tube.
4. The three-leaf stent used in ERCP according to claim 1, characterized in that: The diameter of the drainage tube is greater than the diameter of the guide wire through hole.
5. The three-leaf stent used in ERCP according to claim 1, characterized in that: All side surfaces of the bracket fixing parts away from the guide wire through hole are located on the same cylindrical surface, and the diameter of the cylindrical surface is the diameter of the three-leaf bracket.
6. The three-leaf stent used in ERCP according to claim 1, characterized in that: The maximum circumscribed circle diameter formed by the outer edge of the cross section of the stent body in the width direction is one of 6 mm, 7 mm, 8.5 mm and 12 mm.
7. The three-leaf stent used in ERCP according to claim 1, characterized in that: The length of the bracket body ranges from 5 to 12 cm.
8. The three-leaf stent used in ERCP according to claim 1, characterized in that: The bracket body is an integrally formed part.
9. The three-leaf stent used in ERCP according to claim 1, characterized in that: The support body is a silicone support with a smooth surface.
10. The three-leaf stent used in ERCP according to claim 1, characterized in that: The drainage tube is a flexible tube.