Double-J-shaped self-falling pancreatic duct stent device

Abstract

The utility model relates to a double-J type self-falling pancreatic duct support device which comprises a drainage section catheter, a pancreatic duct fixing part and a duodenum fixing part, the pancreatic duct fixing part and the duodenum fixing part are fixed at the two ends of the drainage section catheter respectively, the pancreatic duct fixing part is of an arc-shaped structure, the duodenum fixing part is of an O-shaped structure, and the drainage section catheter and the duodenum fixing part are integrally formed. One end of the arc-shaped structure is connected with the drainage section catheter in the tangential direction of the arc, the other end of the arc-shaped structure extends by a certain distance in the tangential direction of the arc, and the O-shaped structure of the duodenum fixing part is connected with the drainage section catheter in the tangential direction of the arc. By adopting the double-J-shaped self-falling pancreatic duct support device, arc structures with different radians can be adopted according to the requirement of clinical pancreatic duct drainage time, so that the pancreatic duct support device can automatically fall in different time. The pancreatic duct can be retrograde placed under a duodenoscope to replace an existing hard plastic support or a double-J-shaped support which cannot fall off automatically, and therefore secondary endoscopic treatment is avoided.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to the field of pancreatic duct stents, and specifically refers to a double-J type self-detaching pancreatic duct stent device. Background Art

[0002] During endoscopic sphincterotomy and lithotomy, in order to prevent postoperative acute pancreatitis, a plastic stent with barbs on both ends or a double J-shaped stent is often placed in the pancreatic duct for drainage of pancreatic juice. However, the disadvantage of this type of stent is that (1) it cannot fall off on its own and requires another endoscopic examination to remove it after the treatment is completed. Utility Model Content

[0003] The purpose of the utility model is to overcome the disadvantages of the prior art and provide a double-J type self-detaching pancreatic duct stent device which has simple structure, convenient operation and wide application range.

[0004] In order to achieve the above-mentioned purpose, the double-J type self-detaching pancreatic duct stent device of the utility model is as follows:

[0005] The double J-shaped self-detaching pancreatic duct stent device has the following main features: the device comprises a drainage section catheter, a pancreatic duct fixing part and a duodenal fixing part; the pancreatic duct fixing part and the duodenal fixing part are respectively fixed at two ends of the drainage section catheter; the pancreatic duct fixing part is an arc-shaped structure; the duodenal fixing part is an O-shaped structure; one end of the arc-shaped structure is connected to the drainage section catheter in the tangent direction of the arc; the other end is extended for a distance along the tangent direction of the arc; the O-shaped structure of the duodenal fixing part is connected to the drainage section catheter in the tangent direction of the circle.

[0006] Preferably, four drainage side holes are provided on the side wall of the O-shaped structure of the duodenal fixing part.

[0007] Preferably, six dense side holes are evenly arranged within 10 mm of the midpoint of the outer side wall of the arc-shaped structure of the pancreatic duct fixing portion.

[0008] Preferably, six dense side holes are evenly arranged on the inner wall within a range of 10 mm at the junction of the arc-shaped structure of the pancreatic duct fixing portion and the drainage section and the extension section.

[0009] Preferably, the device is made of silicone and developing wire material.

[0010] Preferably, the drainage catheter has a length of 2 to 4 cm and is provided with centimeter scale marks.

[0011] Preferably, the inner diameter of the O-shaped structure of the duodenal fixation part is 1 cm.

[0012] Preferably, the arc radius of the pancreatic duct fixing portion is 1 cm, and the central angle of the arc-shaped structure is 60 degrees, 90 degrees, 120 degrees or 180 degrees.

[0013] The double J-type self-detaching pancreatic duct stent device of the utility model can adopt arc structures of different curvatures according to the clinical pancreatic duct drainage time requirements, so that it can be self-detached at different times. Retrograde insertion of the pancreatic duct under duodenoscope can replace the existing hard plastic stent or double J-type stent that cannot be self-detached, thereby avoiding endoscopic treatment again. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the double-J type self-detaching pancreatic duct stent device of the utility model.

[0015] Figure 2 This is a schematic diagram of a double-J type self-detaching pancreatic duct stent device of the utility model, in which the arc structure central angle is 120 degrees.

[0016] Figure 3 It is a schematic diagram of a double-J type self-detaching pancreatic duct stent device of the utility model, in which the arc structure central angle is 60 degrees.

[0017] Figure 4 It is a schematic diagram of a double-J type self-detaching pancreatic duct stent device of the utility model, in which the arc structure central angle is 90 degrees.

[0018] Figure 5 It is a schematic diagram of a double-J type self-detaching pancreatic duct stent device of the utility model, in which the arc structure central angle is 180 degrees.

[0019] Figure 6 It is a schematic diagram of the double-J type self-detachable pancreatic duct stent device of the utility model after being placed in the pancreatic duct.

[0020] Reference numerals:

[0021] 1 Tangent point of the arc structure and the drainage tube

[0022] 2 Drainage side holes

[0023] 3 Drainage segment

[0024] 4 cm graduations DETAILED DESCRIPTION

[0025] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0026] The double-J-shaped self-detaching pancreatic duct stent device of the utility model comprises a drainage section catheter, a pancreatic duct fixing part and a duodenal fixing part, wherein the pancreatic duct fixing part and the duodenal fixing part are respectively fixed at two ends of the drainage section catheter, the pancreatic duct fixing part is an arc-shaped structure, and the duodenal fixing part is an O-shaped structure, one end of the arc-shaped structure is connected to the drainage section catheter in the tangent direction of the arc, and the other end is extended for a distance along the tangent direction of the arc, and the O-shaped structure of the duodenal fixing part is connected to the drainage section catheter in the tangent direction of the circle.

[0027] As a preferred embodiment of the utility model, four drainage side holes are provided on the side wall of the O-shaped structure of the duodenal fixation part.

[0028] As a preferred embodiment of the utility model, six dense side holes are evenly arranged within 10 mm of the midpoint of the outer side wall of the arc-shaped structure of the pancreatic duct fixing portion.

[0029] As a preferred embodiment of the utility model, six dense side holes are evenly arranged on the inner wall within 10 mm of the junction between the arc-shaped structure of the pancreatic duct fixing portion and the drainage section and the extension section.

[0030] As a preferred embodiment of the utility model, the device is made of silica gel and developing line materials.

[0031] As a preferred embodiment of the present invention, the length of the drainage section catheter is 2 to 4 cm and is provided with centimeter scale marks.

[0032] As a preferred embodiment of the present utility model, the inner diameter of the O-shaped structure of the duodenal fixation part is 1 cm.

[0033] As a preferred embodiment of the utility model, the arc radius of the pancreatic duct fixing portion is 1 cm, and the central angle of the arc-shaped structure is 60 degrees, 90 degrees, 120 degrees or 180 degrees.

[0034] In a specific embodiment of the present invention, in order to solve the problem that the existing stents cannot fall off by themselves, the present invention provides a double-J type pancreatic duct stent that can fall off by itself. The stent is retrogradely inserted into the drainage part of the pancreatic duct through a duodenoscope, and the stent can fall off by itself at different times after the operation.

[0035] The stent is made of silicone and developing line materials, which has the advantages of being smoother and less irritating to the pancreatic duct. The outer diameter is 5F (1.67mm) and 6F (2.0mm), the wall thickness is 0.3-0.4mm, and the length is 6-10cm. The catheter is made into a double J-type, with the J-type structure on the pancreatic duct side in an arc shape, and the J-type structure on the duodenal side in an O-type (pigtail shape), with the drainage section in the middle. The radius of the arc on the pancreatic duct side is 1cm, and the central angle of the arc is 60 degrees, 90 degrees, 120 degrees and 180 degrees. One end of the arc is connected to the drainage section catheter in the direction of the arc tangent, and the other end is extended by 1cm along the arc tangent direction; the inner diameter of the O-type structure on the duodenal side is 1cm, and it is connected to the drainage section catheter in the direction of the circle tangent; 4 drainage side holes are set on the two side walls of the arc-shaped and O-shaped structure catheters respectively. The drainage section is 2-4cm long and has centimeter scale marks. Dense side holes are set at three locations on the arc-shaped structure in the pancreatic duct, such as Figure 6 As shown in the figure, it can prevent the support of the stent on the pancreatic duct wall from compressing the opening of the branch pancreatic duct after the stent is expanded. The main pancreatic duct is joined by multiple branch pancreatic ducts, and the confluence entrance is easily compressed.

[0036] The O-shaped structure of the stent prevents the stent from shifting into the pancreatic duct in the duodenum and promotes the stent to be discharged from the pancreatic duct under the push of chyme. The friction resistance of the stent in the pancreatic duct depends on the length of the arc part. When the arc radius is fixed, the larger the arc length, the larger the central angle, the greater the support force of the stent catheter on the pancreatic duct wall in the pancreatic duct, the greater the friction resistance, and the longer the stent stays in the pancreatic duct; conversely, the smaller the arc length, the smaller the support force, the smaller the friction resistance, and the shorter the stent stays in the pancreatic duct. Therefore, arc structures with different arc lengths can be selected to control the time when the stent falls off.

[0037] In clinical application, a guide wire is retrogradely inserted into the pancreatic duct under duodenoscope, the pancreatic duct side of the stent is put over the guide wire and pushed into the pancreatic duct through the operating channel of the duodenoscope with a push tube. When the drainage segment enters the pancreatic duct, the guide wire and push tube are withdrawn, and the stent elastically returns to a double J shape.

[0038] In the embodiment of the utility model, the stent is placed retrogradely under duodenoscope. The duodenal papilla is found under the scope, a guide wire is inserted into the pancreatic duct through the operation hole, the stent is sheathed around the guide wire and inserted through the operation channel of the duodenoscope, and the stent is pushed into the pancreatic duct with a push tube. When the drainage section of the stent completely enters the pancreatic duct, the guide wire and the push tube are withdrawn, and the stent remains in the pancreatic duct and the duodenum.

[0039] The double J stent is different from the cobra stent in terms of outer diameter and curvature. Since the normal diameter of the pancreatic duct is 3mm, it will cause blockage of the pancreas during pancreatic duct drainage, increasing the risk of pancreatitis. Therefore, this scheme has selected small diameters of 5F (1.67mm) and 6F (2.0mm) suitable for pancreatic duct drainage, which is more suitable for pancreatic duct drainage. In the design of the curvature of the double J stent, the arc radius on the pancreatic duct side is 1cm, and the central angle of the arc is 60 degrees, 90 degrees, 120 degrees and 180 degrees. It was found in application that the smaller the arc radius, the greater the force required to push the pancreatic duct stent to implant it into the pancreatic duct, which increases the difficulty of pancreatic duct implantation. Therefore, the arc radius on the pancreatic duct side of the double J stent curvature is increased to 1cm, which increases the compliance of the guide wire and facilitates the implantation of the stent.

[0040] In summary, one end of the double-J self-detaching pancreatic duct stent is a pancreatic duct fixing part in an arc shape, and the other end is a duodenal fixing part in a pigtail shape, and the drainage section is in the middle of the two fixing parts. The arc-shaped structure plays a supporting, fixing and drainage role in the pancreatic duct, preventing the stent from slipping off prematurely; the pigtail-shaped structure prevents the stent from retrogradely entering the pancreatic duct in the duodenal cavity, and promotes the scheduled shedding of the stent under the push of chyme and intestinal peristalsis. Pancreatic duct fixing parts with different arcs are designed according to the needs of pancreatic duct drainage time. This stent can be retrogradely inserted into the pancreatic duct under duodenoscope, and is used for the prevention of acute pancreatitis after ERCP / EST and the treatment of acute pancreatitis. The design of the double J stent is not only conducive to the drainage and implantation of the pancreatic duct stent, but also conducive to the controllability of the self-detachment of the pancreatic duct stent, which is an improvement and update of the defects of the stent in the prior art.

[0041] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0042] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0043] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The double J-type self-detaching pancreatic duct stent device of the utility model can adopt arc structures of different curvatures according to the clinical pancreatic duct drainage time requirements, so that it can be self-detached at different times. Retrograde insertion of the pancreatic duct under duodenoscope can replace the existing hard plastic stent or double J-type stent that cannot be self-detached, thereby avoiding endoscopic treatment again.

[0046] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the description and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A double J-type self-detaching pancreatic duct stent device, characterized in that: The device comprises a drainage section catheter, a pancreatic duct fixing part and a duodenal fixing part, wherein the pancreatic duct fixing part and the duodenal fixing part are respectively fixed at two ends of the drainage section catheter, the pancreatic duct fixing part is an arc-shaped structure, and the duodenal fixing part is an O-shaped structure, one end of the arc-shaped structure is connected to the drainage section catheter in the tangent direction of the arc, and the other end is extended for a distance along the tangent direction of the arc, and the O-shaped structure of the duodenal fixing part is connected to the drainage section catheter in the tangent direction of the circle.

2. The double-J type self-detaching pancreatic duct stent device according to claim 1, characterized in that: The side wall of the O-shaped structure of the duodenum fixing part is provided with four drainage side holes.

3. The double-J type self-detaching pancreatic duct stent device according to claim 1, characterized in that: The pancreatic duct fixing portion has 6 dense side holes evenly arranged within a range of 10 mm from the midpoint of the outer side wall of the arc-shaped structure.

4. According to the double-J type self-detachable pancreatic duct stent device of claim 1, six dense side holes are evenly arranged on the inner wall within 10 mm of the intersection of the arc-shaped structure of the pancreatic duct fixing part and the drainage section and the extension section.

5. The double-J self-detaching pancreatic duct stent device according to claim 1, characterized in that: The device is made of silica gel and developing line materials.

6. The double-J type self-detaching pancreatic duct stent device according to claim 1, characterized in that: The length of the drainage section catheter is 2 to 4 cm and is provided with centimeter scale marks.

7. The double-J type self-detaching pancreatic duct stent device according to claim 1, characterized in that: The inner diameter of the O-shaped structure of the duodenum fixing part is 1 cm.

8. The double-J self-detaching pancreatic duct stent device according to claim 1, characterized in that: The arc radius of the pancreatic duct fixing portion is 1 cm, and the center angle of the arc-shaped structure is 60 degrees, 90 degrees, 120 degrees or 180 degrees.

Images