Pancreatic duct stent

Abstract

The utility model discloses a pancreatic duct stent, which belongs to the technical field of medical instruments and comprises a hollow stent body extending into a pancreatic duct and a retaining part positioned outside the pancreatic duct, more than one barb is arranged on the stent body, and a developing marking part is arranged at the front end of the stent body. Developing marking parts are arranged at the front end, the rear end and the retaining part of the stent body, so that the stent body is prevented from exceeding or not reaching a specified position when being put into the pancreatic duct. The two barbs are arranged on the stent body, and if the pancreatic duct section where one barb is located has inflammation, the other barb can also achieve position fixation when the barb cannot fix the stent in the pancreatic duct. The multiple drainage holes are formed, the drainage effect can be improved, pancreatic juice of the branch pancreatic ducts can be drained, and when one or more drainage holes are blocked, the other drainage holes can still keep the drainage effect. The length of the stent body is matched with the length of pancreatic ducts of most of Chinese people, the statistical result is met, sufficient drainage of pancreatic juice of the whole pancreatic section is guaranteed, and the actual clinical condition is better met.

Description

Technical Field

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

[0002] The pancreatic duct is a duct in the exocrine pancreas. It opens into the duodenum and serves as the main excretory duct of the pancreas. Located within the pancreatic parenchyma, near the back of the pancreas, the duct runs longitudinally from left to right, passing through numerous small ducts that collect in the pancreatic lobules. Therefore, its diameter gradually increases from left to right. At the right side of the pancreatic head, the duct leaves the pancreas and passes obliquely through the posteromedial wall of the descending duodenum, merging with the common bile duct and opening into the duodenal papilla.

[0003] During pancreatic and bile duct surgeries, stents need to be placed for drainage to reduce inflammation. However, in actual practice, on the one hand, the stent is easily displaced in the pancreatic duct, resulting in its inability to function. On the other hand, most of the stents currently used in hospitals are imported. However, in actual applications, it has been found that the length of imported products is not suitable for the pancreatic duct length of Chinese people. Too long a length may cause pancreatic duct penetration, and too short a length may lead to insufficient drainage. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a pancreatic duct stent which is of suitable length and provided with barbs to prevent displacement.

[0005] Technical solution: In order to solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0006] The invention comprises a hollow stent body extending into the pancreatic duct and a retaining portion located outside the pancreatic duct. The stent body is provided with one or more barbs, and a development marking portion is provided at the front end of the stent body.

[0007] Furthermore, a plurality of drainage holes are evenly spaced apart on the bracket body.

[0008] Furthermore, the drainage hole is in a circular, elliptical or waist-shaped shape.

[0009] Furthermore, the barb is arranged at the front end of the bracket body, and the opening of the barb faces the rear end of the bracket body.

[0010] Furthermore, there are two barbs, the interval between the two barbs arranged on the bracket body is 2cm to 8cm, and the distance between the barb located at the front end of the bracket body and the front end of the bracket body is 2cm.

[0011] Furthermore, the two barbs are arranged on axes on different sides of the outer circumference of the stent body, and the angle θ between the axes where the two barbs are located is: 50°<θ<180°.

[0012] Furthermore, the length of the bracket body is 11 to 16 cm.

[0013] Furthermore, the length of the bracket body is 14 cm.

[0014] Furthermore, the front end of the bracket body is open, and the front end of the bracket body is configured to be tapered with a diameter smaller than that of the bracket body.

[0015] Furthermore, the retaining portion is provided at the tail end of the bracket body, and the retaining portion is an arc or ring extending from the bracket body.

[0016] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0017] (1) The pancreatic duct stent of the present invention is provided with imaging marking portions at the front and rear ends of the stent body and the retention portion. The imaging marking portion at the front end can clearly show the position reached by the front end of the stent body, thereby preventing the stent body from exceeding the designated position when being placed in the pancreatic duct.

[0018] (2) The pancreatic duct stent of the present invention is provided with two barbs on the stent body. If the pancreatic duct segment where one barb is located becomes inflamed and the barb at the other location cannot fix the pancreatic duct stent in the pancreatic duct, the other stent can also achieve the function of fixing the position.

[0019] (3) The length of the pancreatic duct stent of the present invention is 11-16 cm. In clinical use, 14 cm is preferred, which is suitable for the pancreatic duct length of most Chinese people and can ensure sufficient drainage of pancreatic juice in the entire pancreas. It is consistent with the results of statistical analysis and more in line with actual clinical conditions.

[0020] (4) The pancreatic duct stent of the present invention has multiple drainage holes evenly spaced on the stent body to improve the drainage effect and drain the pancreatic fluid of the branch pancreatic duct. When one or more of the drainage holes are blocked, the other drainage holes can still maintain the drainage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the pancreatic duct stent structure.

[0022] Figure 2 This is a side view of the pancreatic duct stent. DETAILED DESCRIPTION

[0023] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solutions of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] The “front end” described below in the present invention refers to the direction of insertion into the pancreatic duct of the human body, and the “back end” refers to the direction of retention outside the pancreatic duct.

[0025] like Figure 1 As shown, a pancreatic duct stent includes a hollow stent body 1 extending into the pancreatic duct and a retention portion 2 located outside the pancreatic duct. The stent body 1 and the retention portion 2 located outside the pancreatic duct are integrally formed. The retention portion 2 is located at the rear end of the stent body 1, is annular, and can be deformed under the action of external force, which is convenient for flexible operation during surgery.

[0026] The retaining portion 2 is provided at the tail end of the stent body 1 . The retaining portion 2 is an arc or ring extending from the stent body 1 and is located outside the pancreatic duct.

[0027] The stent body 1 is the portion implanted in the pancreatic duct. Multiple drainage holes 5 are evenly spaced throughout the stent body 1. The stent body 1 is also provided with one or more barbs 3, and a development marker 4 is located at the front end. The front end of the stent body 1 is open and tapered, with a diameter smaller than the diameter of the stent body 1.

[0028] The drainage hole 5 is mainly arranged on the stent body 1. Its main function is to discharge the accumulated fluid formed during the infection and inflammation of the pancreatic duct through the drainage hole 5 into the hollow tube of the stent body 1 and then out of the pancreatic duct. The drainage hole 5 is in the shape of a circular, oval or waist-shaped small hole. The interval between adjacent drainage holes 5 is about 1-3 cm. Taking a circular hole as an example, the diameter of the drainage hole 5 is about 1-2 mm.

[0029] The main function of the barb 3 is to prevent the stent body 1 implanted in the pancreatic duct from rotating within the duct or shifting axially. The present invention first arranges a barb 3 at the front end of the stent body 1, with the barb 3 located at the front end of the stent body 1 2 cm away from the front end of the stent body 1. The opening of the barb 3 faces the rear end of the stent body 1, and the barb 3 can effectively prevent the stent body 1 from shifting. However, clinical practice has found that after infection, decay, and necrosis occur in this section of the pancreatic duct, the barb 3 cannot effectively attach to the inner wall of the pancreatic duct, causing the stent body 1 to shift.

[0030] Therefore, further, the present invention provides at least two barbs 3 on the stent body 1. After the pancreatic duct portion where one barb is located is necrotic, the other barb 3 can still play the role of fixing the stent body 1. Therefore, the interval between the two barbs 3 of the two stent bodies 1 is 2cm to 8cm.

[0031] In order to achieve a better fixing effect of the two barbs 3, the two barbs 3 are arranged on axes in different directions of the outer circumference of the bracket body 1, and the angle θ between the axes where the two barbs 3 are located is: 50°<θ<180°.

[0032] Existing stents are generally too long. According to statistical surveys and clinical experience, the pancreatic duct is approximately 14-16 cm long. Imported stents are only up to 11 cm long, which does not fit the pancreas size of most Chinese people. A stent that is too short results in insufficient pancreatic fluid drainage and cannot meet the drainage requirements of the entire pancreas. Therefore, the stent body 1 of the present invention is 11-16 cm long. Preferably, the stent body 1 is 14 cm long, which is suitable for the pancreas of most Chinese people.

[0033] The present invention provides imaging markers 4 at both the front and rear ends of the stent body 1, which can be visualized using fluorescence or X-rays. The imaging markers 4 at the front end clearly confirm the proper placement of the stent body 1 within the pancreatic duct during surgery, preventing the front end of the stent body 1 from exceeding the intended position and potentially damaging the duct. The imaging markers 4 at the rear end of the stent body 1 facilitate accurate identification of the rear end during surgery.

[0034] The method of using the utility model in surgery:

[0035] Most patients with pancreatitis experience pancreatic duct obstruction and high blood pressure. This obstruction or high blood pressure may be caused by pancreatic sphincter spasm, edema, or thick pancreatic fluid, or even protein plugs blocking the duct. This obstruction can be single or multiple throughout the pancreas. The present invention can fully drain thick pancreatic fluid or protein plugs by supporting the pancreatic duct and the pancreatic sphincter. It can also be applied to the entire pancreas, relieving various types of pancreatic duct obstruction and high blood pressure, thereby achieving the purpose of treating pancreatitis.

[0036] In some patients with necrotizing pancreatitis, necrosis can extend to the main pancreatic duct, leading to extensive necrosis encompassing the main pancreatic duct, pancreatic parenchyma, and surrounding tissues. Some pancreatic necrosis can be located in the tail of the pancreas. In such cases, the present invention can reach the necrotic site via the duodenal papilla-main pancreatic duct, achieving the goal of draining necrotic fluid and sediment. While a pancreatic duct stent that is too short cannot reach the tail of the pancreas, the present invention can reach all parts of the pancreas, satisfying the drainage needs of necrotic material in different locations.

[0037] In some patients with necrotizing pancreatitis, necrosis can extend into the main pancreatic duct, leading to ductal loss and pancreatic fluid leakage. This can occur anywhere, including the tail of the pancreas. The present invention can bypass this necrosis to support the missing portion of the main pancreatic duct, drain pancreatic fluid, and prevent pancreatic fluid leakage. After a period of support, the missing portion of the main pancreatic duct is covered by newly formed cells, restoring the integrity of the main pancreatic duct and achieving the goal of treating necrotizing pancreatitis.

[0038] Most episodes of pancreatitis are accompanied by damage to the main or branch pancreatic ducts, leading to pancreatic fluid leakage and even, in later stages, long-term pancreatic fistulas, requiring long-term external drainage and increasing the pain and burden on patients. The present invention can fully drain pancreatic fluid from the entire pancreas, reducing the amount of pancreatic fluid leakage or fistulas, thereby giving the pancreas a chance to repair itself and ultimately ending pancreatic fluid leakage and fistulas, achieving the goal of treating pancreatitis.

[0039] When necrotizing pancreatitis occurs, necrotic pancreatic tissue may block the pancreatic duct, further aggravating the condition. Some necrotic areas are located in the tail of the pancreas, and pancreatic duct stents that are too short cannot reach this area, preventing adequate drainage. The side hole design and extended length of the present invention ensure smooth drainage of necrotic tissue and adequate drainage of pancreatic fluid from the entire pancreas.

[0040] In addition to pancreatitis, other diseases such as pancreatic tumors, pancreatic duct stones, and pancreatic duct stenosis can lead to pancreatic duct obstruction and hypertension, making pancreatic juice drainage an indication. These diseases can occur anywhere in the pancreas and can be single or multiple. The present invention can relieve pancreatic duct obstruction and hypertension at any location in the pancreatic duct by draining pancreatic juice from the entire pancreas, achieving the goal of treating different locations and types of pancreatic diseases.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pancreatic duct stent, characterized by: The invention comprises a hollow stent body (1) extending into the pancreatic duct and a retention portion (2) located outside the pancreatic duct, wherein two barbs (3) are provided on the stent body (1), and the interval between the two barbs (3) is 2 cm to 8 cm. The distance between the barb (3) located at the front end of the stent body (1) and the front end of the stent body (1) is 2 cm. A development marking portion (4) is provided at the front end of the stent body (1), and the length of the stent body (1) is 11 to 16 cm.

2. The pancreatic duct stent according to claim 1, characterized in that: A plurality of drainage holes (5) are evenly spaced apart on the bracket body (1).

3. The pancreatic duct stent according to claim 2, characterized in that: The drainage hole (5) is in the shape of a circle, an ellipse or a waist.

4. The pancreatic duct stent according to claim 1, characterized in that: The barb (3) is arranged at the front end of the bracket body (1), and the opening of the barb (3) faces the rear end of the bracket body (1).

5. The pancreatic duct stent according to claim 1, characterized in that: The two barbs (3) are arranged on axes in different directions of the outer circumference of the bracket body (1), and the angle θ between the axes where the two barbs (3) are located is: 50°<θ<180°.

6. The pancreatic duct stent according to claim 1, characterized in that: The length of the bracket body (1) is 14 cm.

7. The pancreatic duct stent according to claim 1, characterized in that: The front end of the bracket body (1) is open, and the front end of the bracket body (1) is configured to be tapered with a diameter smaller than the diameter of the bracket body (1).

8. The pancreatic duct stent according to claim 1, characterized in that: The retaining portion (2) is arranged at the tail end of the bracket body (1), and the retaining portion (2) is an arc or ring extending from the bracket body (1).

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