Single-pigtail pancreatic bile duct stent

Abstract

The utility model provides a single pigtail pancreaticobiliary duct stent which comprises a head part, a body part and a tail part which are connected with one another from head to tail, a developing ring is arranged on the tube wall of one end, close to the head part, of the body part, a plurality of first side holes are formed in the tube wall of the body part, and inner displacement preventing side wings are arranged on the tube wall of one end, close to the tail part, of the body part; the tail part is in a single pigtail shape, and a plurality of second side holes are formed in the tube wall of the tail part; the pancreaticobiliary stent is a single-channel tube, a single channel is arranged in the pancreaticobiliary stent, and the first side hole and the second side hole are both communicated with the single channel. The developing ring can position the head end of the pancreaticobiliary duct support, the tube wall side wings can prevent intestinal papilla from causing the single pigtail loop to enter the common bile duct or the pancreaticobiliary duct, and the single pigtail loop is easy for the support to automatically fall off.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a single pigtail pancreaticobiliary stent. Background Art

[0002] Endoscopic retrograde cholangiopancreatography (ERCP) is a minimally invasive surgical procedure for treating hepatobiliary and pancreatic duct diseases, with advantages such as minimal trauma, rapid recovery, and strong repeatability. Endoscopic bile duct stent placement is used to treat conditions such as bile duct stenosis, obstructive jaundice, and acute cholangitis. It can also be used to prevent complications such as acute cholangitis and acute pancreatitis after ERCP, bile leakage and bile duct stenosis after common bile duct exploration, and anastomotic stenosis after bile duct anastomosis. Endoscopic pancreatic duct stent placement is used to treat conditions such as pancreatic duct stenosis, acute and chronic pancreatitis, and pancreatic duct stones. It can also be used to prevent acute pancreatitis after ERCP.

[0003] The bile duct or pancreatic duct stent currently used for the prevention of complications after biliary surgery is mainly a single pigtail pancreatic and bile duct stent, which has an anti-detachment wing on the head end of the tube wall, and the tail is in the shape of a single pigtail and is provided with a positioning ring. The above-mentioned single pigtail pancreatic and bile duct stent has the following shortcomings in clinical applications: 1. During the placement or release of the stent, part of the single pigtail segment can enter the common bile duct or pancreatic duct and cannot form a single pigtail loop. During intestinal peristalsis, the single pigtail loop may partially or completely enter the common bile duct or pancreatic duct, making it difficult to remove; 2. After part of the single pigtail segment enters the common bile duct or pancreatic duct, in order to avoid displacement within the stent, it is necessary to use a foreign body forceps to pull the single pigtail loop from the common bile duct or pancreatic duct into the duodenal cavity to reform the single pigtail loop, which wastes operation time, increases operation costs, and increases the incidence of complications such as bleeding; 3. The developing ring is located on one side of the single pigtail loop. The head end of the stent lacks a positioning device, resulting in unclear X-ray display; 4. The single pigtail loop is prone to pancreatic and biliary stent detachment under the action of intestinal peristalsis and food squeezing. However, during the detachment process of the single pigtail pancreatic and biliary stent, the anti-slip side wings at the head end of the stent may damage the bile duct mucosa, pancreatic duct mucosa and Oddi's sphincter, inducing complications such as acute cholangitis, acute pancreatitis and biliary bleeding; 5. The premise for the single pigtail pancreatic duct stent to detach is that the anti-slip side wings are pulled and folded back, thereby losing their anti-slip function. However, the inner diameter of the pancreatic duct is relatively thin, and the anti-slip side wings are difficult to fold back. Therefore, the natural detachment rate is low, and a second endoscopy is required to remove the pancreatic duct stent that has not detached. Utility Model Content

[0004] In response to the above technical problems, a single pigtail pancreaticobiliary stent is provided. The technical means adopted by the utility model are as follows:

[0005] A single pigtail pancreaticobiliary stent comprises: a head, a body, and a tail connected to each other from head to tail; a developing ring is provided on the wall of the body near the head end; a plurality of first side holes are provided on the wall of the body; and a side wing is provided on the wall of the body near the tail end to prevent internal displacement; the tail is in the shape of a single pigtail and is provided with a plurality of second side holes on the wall of the tail.

[0006] The pancreaticobiliary duct stent is a single-channel tube with a single channel provided inside, and the first side hole and the second side hole are both connected to the single channel.

[0007] Furthermore, the head has a conical structure.

[0008] Furthermore, the first side hole is elliptical.

[0009] Furthermore, the second side hole is circular.

[0010] Furthermore, the outer diameter of the pancreaticobiliary stent is 5-10Fr.

[0011] Furthermore, the inner diameter of the pancreaticobiliary stent is 4-8 Fr.

[0012] Furthermore, the length of the pancreaticobiliary stent is 5-18 cm.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The front end of the tube body of the utility model is provided with a developing ring, which can locate the position of the head end of the pancreaticobiliary duct stent.

[0015] 2. The utility model has an anti-inward displacement wing at one end of the body near the tail, which can not only locate the depth of the pancreaticobiliary stent placement, but also prevent the single pigtail loop from shifting into the common bile duct or pancreatic duct during the placement, release or retention of the stent.

[0016] 3. The body of the utility model has no anti-slip side wings, and the probability of the pancreaticobiliary stent falling off naturally is high.

[0017] Based on the above reasons, the present invention can be widely promoted in the fields of medical treatment and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] In the figure: 1, head; 2, body; 21, developing ring; 22, first side hole; 23, anti-inward displacement side wing; 3, tail; 31, second side hole. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the present invention provides a single pigtail pancreaticobiliary stent. The stent is a single-channel tube, divided into a head 1, a body 2, and a tail 3 that are interconnected from head to tail. The head 1 is conical, and the body 2 is provided with a developing ring 21 on the tube wall near the head 1 end, and multiple elliptical first side holes 22 are provided on the tube wall. The body 2 is provided with anti-inward displacement side wings 23 on the tube wall near the tail 3 end; the tail 3 is in the shape of a single pigtail, and multiple circular second side holes 31 are provided on the tube wall of the tail 3. The pancreaticobiliary stent is provided with a single channel inside, and the first side hole 22 and the second side hole 31 are both connected to the single channel. The pancreaticobiliary stent has an outer diameter of 5-10Fr, a corresponding inner diameter of 4-8Fr, and a length of 5-18cm.

[0023] The utility model is placed in the common bile duct or pancreatic duct over the duodenal papilla to drain bile or pancreatic juice. During the placement process, the side wings on the tube wall can determine the insertion depth and prevent the single pigtail tube from entering the common bile duct or pancreatic duct. During the indwelling process, the developing ring on the tube wall can locate the position of the head end of the stent. The side wings on the tube wall can prevent the intestinal papilla from causing the single pigtail loop to enter the common bile duct or pancreatic duct, and the single pigtail loop is easy to fall off by itself.

[0024] When the present invention is used, a zebra guidewire is first placed in the common bile duct or pancreatic duct. A single pigtail pancreaticobiliary stent of appropriate length and outer diameter is selected as needed. The pancreaticobiliary stent and pusher are then placed over the inner core and guidewire in sequence. Under the guidance of the guidewire and inner core, the pancreaticobiliary stent is inserted into the common bile duct and pancreatic duct. When the anti-inward displacement wing is close to the duodenal papilla, the operator presses the pusher and bile duct stent downward toward the distal end of the duodenum, while an assistant secures the pusher and pulls back the guidewire and inner core. When the guidewire enters the pusher lumen, the bile duct stent separates from the pusher, and the tail of the pancreaticobiliary stent naturally forms a single pigtail loop.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single pigtail pancreaticobiliary stent, characterized in that: include: A head (1), a body (2) and a tail (3) are connected to each other from head to tail, a developing ring (21) is provided on the tube wall of the body (2) at one end close to the head (1), a plurality of first side holes (22) are provided on the tube wall of the body (2), and an anti-inward displacement side wing (23) is provided on the tube wall of the body (2) at one end close to the tail (3); the tail (3) is in the shape of a single pigtail, and a plurality of second side holes (31) are provided on the tube wall of the tail (3); The pancreaticobiliary duct stent is a single-channel tube with a single channel provided inside, and the first side hole (22) and the second side hole (31) are both connected to the single channel.

2. The single pigtail pancreaticobiliary stent according to claim 1, characterized in that: The head (1) has a conical structure.

3. The single pigtail pancreaticobiliary stent according to claim 1, characterized in that: The first side hole (22) is oval in shape.

4. The single pigtail pancreaticobiliary stent according to claim 1, characterized in that: The second side hole (31) is circular.

5. The single pigtail pancreaticobiliary stent according to claim 1, characterized in that: The outer diameter of the pancreaticobiliary stent is 5-10Fr.

6. The single pigtail pancreaticobiliary stent according to claim 1, characterized in that: The inner diameter of the pancreaticobiliary stent is 4-8 Fr.

7. The single pigtail pancreaticobiliary stent according to claim 1, characterized in that: The length of the pancreaticobiliary stent is 5-18 cm.

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