CN218420151U

CN218420151U - Film-covered anti-reflux biliary tract metal stent

Info

Publication number: CN218420151U
Application number: CN202221803356.5U
Authority: CN
Inventors: 张�诚
Original assignee: Shanghai East Hospital Tongji University Affiliated East Hospital
Current assignee: Shanghai East Hospital Tongji University Affiliated East Hospital
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2023-02-03
Anticipated expiration: 2032-07-12

Abstract

The utility model provides a tectorial membrane anti-reflux biliary tract metal stent which is woven into a grid shape by nickel-titanium alloy wires and comprises a stent body, wherein the stent body comprises a first stent, a second stent and a third stent which are sequentially arranged at the front side, the middle part and the tail side of the stent body; the third bracket comprises a front bracket and a tail bracket, the front end of the front bracket is connected with the second bracket, the tail end of the front bracket is connected with the tail bracket, and the front bracket is in an arc shape and protrudes to the outer side wall; the tail support is in a round table structure; the inner and outer walls of the first bracket and the second bracket are covered with biological membranes; the inner and outer walls of the front stent of the third stent are covered with biological membranes, and the tail stent is not covered with membranes. The tail part of the bracket of the utility model is in a round table net shape which can block the reverse flow of the large food; the circular truncated cone metal mesh at the tail part of the bracket is not coated with a film, so that bile excretion is not influenced; the small food which flows back through the meshes and enters the cavity of the bracket can be discharged through the central opening of the bracket.

Description

Film-covered anti-reflux biliary tract metal stent

Technical Field

The utility model relates to a medical technology of wicresoft and surgical instruments technical field especially relate to a tectorial membrane prevents back flow biliary tract metal support.

Background

The benign and malignant stricture of the extrahepatic bile duct and duodenal papilla is common in clinic, and is mostly manifested by clinical symptoms such as abdominal pain, chills, high fever, jaundice and the like, and the persistence of the biliary tract Xu Gengzu can cause cholestatic cirrhosis, gallstones and liver failure, and even endanger the life of patients.

The duodenoscope technology is one of the methods for treating benign and malignant strictures of extrahepatic bile ducts and duodenal papilla at present, and has the advantages of small wound, remarkable curative effect, few complications and the like. The biliary tract stent implantation is the key to the duodenoscope technology in treating biliary stricture, and compared with a plastic stent, a biliary tract metal stent is simple to implant, large in direct expansion, long in unobstructed time and wide in clinical application.

The biliary tract metal stent comprises a full-naked metal stent, an inner-layer film-covered metal stent, a full-film-covered metal stent and the like. The fully-covered metal stent is generally used for malignant bile duct stenosis, after the metal stent is released, the mucous membrane of the bile duct and the tumor tissue at the stenosis part can grow into and wrap the stent metal wire through the stent meshes, and once the stent is placed, the stent can not be taken out in the later period; the inner-layer film-covered metal stent is also used for malignant bile duct stenosis, the inner layer of the stent covers a biological film, the mucosa of the bile duct and tumor tissues can wrap part of metal wires, the metal stent is still difficult to take out in the later stage, but the biological film is difficult to break through, the inner-layer film is favorable for bile to flow out, the formation of bile mud is inhibited, and the smoothness of the stent is further prolonged; the full-film-covered metal stent covers the outer layer and the inner layer of the stent, prevents bile duct mucous membranes and tumor tissues from growing in, prolongs the smoothness of the stent, and can be taken out, so that the full-film-covered metal stent can be used for malignant biliary stricture and benign biliary stricture.

However, the metal bracket of the biliary tract is kept over the duodenal papilla, the tightness of the biliary tract is damaged, and gas, intestinal fluid and chyme in the intestinal tract can flow back into the biliary tract through the bracket cavity, so that complications such as reflux cholangitis, liver abscess, bile duct blockage and the like are induced. Aiming at the defects of the existing stent backflow, the following backflow prevention stent appears: (1) a full-tectorial membrane anti-reflux biliary tract metal stent (ZL 201621129539.8) conforming to a physiological structure is characterized in that an anti-reflux valve consisting of three arc valve leaflets with the same size is arranged in a stent main body close to the duodenum end. The structure that above-mentioned support increased three circular arc valve leafs in the lumen is comparatively complicated, and the gap between the adjacent valve leaf is less under the ideal state, can block the palirrhea of intestines content, but the pressure that forms between two intestines wriggling ripples increases, can arouse the deformation of valve when the chyme advances, or under the chyme extrusion effect, the valve moves to the homonymy, and then loses and prevents the refluence function. (2) An anti-reflux biliary tract stent (ZL 202022373604.4) is provided, which is provided with an anti-reflux baffle arranged on a thick pipe section, when intestinal gastric juice or food residues can extrude the anti-reflux baffle, the anti-reflux baffle seals a flexible drainage pipe, the intestinal gastric juice or food residues are prevented from flowing back to enter the biliary tract, and the risk of biliary tract infection is reduced. In the bracket, in order to keep the sealing effect of the baffle on the flexible drainage tube, the bracket is made of hard material, the maximum outer diameter of the thick tube section of the bracket can only be 10Fr due to the limitation of the inner diameter of a duodenoscope forceps channel, and the inner diameter of the flexible drainage tube is designed to be smaller due to the complex structure of the bracket, so that the flexible drainage tube is not beneficial to bile excretion; the biliary tract stent is generally placed under the guidance of a guide wire, and a guide wire channel is not left in a stent lumen of the stent, so that the biliary tract stent is not suitable for endoscopic placement; the metal stent is accommodated in the outer sheath before release, the outer diameter is generally 7-8.5Fr, the diameter is generally 6-10mm after release, and the baffle arranged in the lumen of the stent is not suitable for biliary tract metal stents with different inner diameters before and after release. (3) An anti-reflux biliary stent (ZL 201320390256.9) for carrying radioactive particles is provided with an anti-reflux device at one end of a drainage tube and comprises at least two valves arranged on the same rotating shaft. Because set up axis of rotation and rotation flap in the lumen, only can be rigid plastic support, be difficult to realize on metal support, above-mentioned support is comparatively meticulous moreover, and the cost of manufacture is higher. (4) The anti-reflux biliary tract film-coated metal stent (ZL 202020760512.9) is characterized in that an L-shaped anti-reflux sleeve is arranged at one end of the stent, a guide wire channel is not reserved in the center of the stent, the stent is not favorable for being placed in, a tail end hole of the L-shaped channel is small, the bile flows out, small stones formed by deposition in a biliary tract are easy to be embedded at an L-shaped corner, and the stent is blocked.

SUMMERY OF THE UTILITY MODEL

In accordance with the technical problems proposed above, a coated anti-reflux biliary tract metal stent is provided. The utility model mainly utilizes the design of the tail part of the bracket into a round table net shape to block the backflow of large food; the circular truncated cone metal net at the tail part of the bracket is not covered with a film, so that bile excretion is not influenced; the small food which flows back through the meshes and enters the cavity of the bracket can be discharged through the central opening of the bracket. The utility model discloses a technical means as follows:

a tectorial membrane anti-reflux biliary tract metal stent is woven into a grid shape by nickel-titanium alloy wires and comprises a stent body, wherein the stent body comprises a first stent, a second stent and a third stent which are connected and sequentially arranged on the front side, the middle part and the tail side of the stent body;

the third bracket comprises a front bracket and a tail bracket which are connected, the front end of the front bracket is connected with the second bracket, the tail end of the front bracket is connected with the tail bracket, and the front bracket is in an arc shape and protrudes to the outer side wall; the tail support is of a round table-shaped structure;

the inner and outer walls of the first bracket and the second bracket are covered with biological membranes;

the inner wall and the outer wall of the front stent of the third stent are covered with biological membranes, and the tail stent of the third stent is not covered with membranes.

Further, the first bracket is in an arc shape and protrudes towards the outer side wall.

Further, the second bracket is of a cylindrical structure.

Furthermore, the size of the opening at the tail end of the circular truncated cone-shaped structure is larger than that of the latticed side hole of the metal support.

Further, the length of the metal stent is 4cm, 6cm, 8cm or 10cm.

Further, the diameter of the second stent is 6mm, 8mm or 10mm.

Further, the length of the tail support is 5-10mm, and the outer diameter of the opening is 7-8.5Fr.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model provides a tectorial membrane anti-reflux biliary tract metal support, support afterbody become the netted palirrhea that can block bold food of round platform.

2. The utility model provides a tectorial membrane is prevented anti-biliary tract metal support, support afterbody round platform metal mesh do not have the tectorial membrane, do not influence the bile and excrete.

3. The utility model provides a tectorial membrane anti-reflux biliary tract metal support through the palirrhea fritter food that gets into the support chamber of mesh, can be through support central opening discharge.

Based on the reason, the utility model discloses can extensively promote in fields such as medical treatment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a first bracket; 2. a second bracket; 3. a third support; 4. and a tail support.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in figure 1, the utility model provides a tectorial membrane anti-reflux biliary tract metal stent, which is a duodenoscope minimally invasive surgical instrument used for treating duodenal papilla and benign and malignant biliary stricture diseases.

The covered membrane anti-reflux biliary tract metal stent is woven into a grid shape by nickel-titanium alloy wires and comprises a stent body and a covered membrane, wherein the stent body comprises a first stent 1, a second stent 2 and a third stent 3 which are connected and sequentially arranged on the front side, the middle part and the tail side of the stent body;

the third bracket comprises a front bracket and a tail bracket 4 which are connected, the front end of the front bracket is connected with the second bracket, the tail end of the front bracket is connected with the tail bracket, and the front bracket (the initial part) is in an arc shape and protrudes towards the outer side wall, namely towards the direction of the tail bracket; the tail support is of a round table-shaped structure;

the inner and outer walls of the first bracket and the second bracket are covered with biological films;

The utility model discloses the advantage shows: the round table metal mesh at the tail part of the metal support does not influence bile excretion, can block the backflow of large food, and small food can be discharged through the central opening of the support after entering the support cavity through the backflow of meshes, so that the unobstructed time of the metal support is prolonged.

In a preferred embodiment, the first bracket protrudes outward in a circular arc shape toward the outer side wall, i.e., in a direction away from the third bracket.

In a preferred embodiment, the second support is of a cylindrical configuration.

In a preferred embodiment, the opening size of the tail end of the truncated cone-shaped structure is larger than the size of the latticed side holes of the metal support.

As a preferred embodiment, the length of the metal stent is 4cm, 6cm, 8cm or 10cm.

In preferred embodiments, the second stent has a diameter of 6mm, 8mm or 10mm.

In a preferable embodiment, the length of the caudal stent is 5-10mm, and the external diameter of the opening is 7-8.5Fr.

The end of the inner core of the metal stent releaser is placed into the metal stent lumen, and then the metal stent is received into the outer sheath of the metal stent releaser. The releaser with the metal bracket is placed under the guidance of the guide wire, the metal bracket is gradually released after a proper position is selected, the metal bracket slowly bounces open, after the metal bracket is completely released, the releaser is withdrawn, the first bracket (the head part of the metal bracket) and the second bracket (the body part of the metal bracket) of the metal bracket are positioned in the common bile duct, and the third bracket (the tail part of the metal bracket) is positioned outside the duodenal papilla.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A tectorial membrane anti-reflux biliary tract metal stent is characterized in that a nickel-titanium alloy wire is woven into a grid shape and comprises a stent body, wherein the stent body comprises a first stent, a second stent and a third stent which are connected and sequentially arranged on the front side, the middle part and the tail side of the stent body;

2. The covered anti-reflux biliary stent according to claim 1, wherein the first stent has a circular arc shape protruding toward the outer side wall.

3. The coated anti-reflux biliary stent of claim 1, wherein the second stent is a cylindrical structure.

4. The coated anti-reflux biliary stent of claim 1, wherein the opening at the tail end of the truncated cone-shaped structure is larger than the size of the latticed side holes of the metallic stent.

5. The coated anti-reflux biliary stent of claim 1, wherein the metal stent has a length of 4cm, 6cm, 8cm, or 10cm.

6. The coated anti-reflux biliary stent of claim 1 or claim 3, wherein the second stent has a diameter of 6mm, 8mm, or 10mm.

7. The coated anti-reflux biliary stent of claim 1, wherein the caudal stent has a length of 5-10mm and an opening outer diameter of 7-8.5Fr.