阅读说明：本技术 一种肝胆囊肿引流支架 (Drainage support for hepatobiliary cyst ) 是由 金富康 沈礼宝 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种肝胆囊肿引流支架,涉及到医疗器械技术领域,包括外支架,所述外支架内安装有内支撑架机构,所述内支撑架机构包括第一内撑架组件、第二内撑架组件、第三内撑架组件,所述第一内撑架组件、所述第二内撑架组件、所述第三内撑架组件上安装有同一个万向连接组件,并且能在万向连接组件上移动。本发明结构合理,实现对不同的胆道起到支撑引流作用,并且能根据胆道撑开的开度大小需求,进行调节,且不同位置引流支架开度不同调节,提高了支撑效果,对胆道扩开后,避免了胆道内病变梗阻,便于引流支架从胆道内取出,实现引流支架在存在角度的胆道位置处,都能实现较好的支撑作用,进一步提高了引流支架的适用范围。(The invention discloses a hepatobiliary cyst drainage support, which relates to the technical field of medical instruments and comprises an outer support, wherein an inner support mechanism is arranged in the outer support, the inner support mechanism comprises a first inner support frame assembly, a second inner support frame assembly and a third inner support frame assembly, and the first inner support frame assembly, the second inner support frame assembly and the third inner support frame assembly are provided with the same universal connection assembly and can move on the universal connection assembly. The biliary tract stent has a reasonable structure, realizes supporting and drainage effects on different biliary tracts, can be adjusted according to the opening size requirement of biliary tract opening, improves the supporting effect by adjusting the opening of the biliary tract stent at different positions in different ways, avoids biliary tract lesion obstruction after the biliary tracts are opened, is convenient for taking out the biliary tract stent, realizes that the biliary tract stent can realize better supporting effect at the position of the biliary tracts with an angle, and further improves the application range of the biliary tract stent.)

1. The utility model provides a hepatobiliary cyst drainage support, includes network structure's outer support (1), outer support (1) has certain flexible elasticity, its characterized in that: an inner support frame mechanism (3) is installed in the outer support frame (1), the inner support frame mechanism (3) comprises a first inner support frame assembly, a second inner support frame assembly and a third inner support frame assembly, the first inner support frame assembly, the second inner support frame assembly and the third inner support frame assembly are provided with the same universal connection assembly and can move on the universal connection assembly to be used for expanding the outer support frame (1), the first inner support frame assembly, the second inner support frame assembly and the third inner support frame assembly are all provided with limit units, and the limit units are used for limiting the positions of the first inner support frame assembly, the second inner support frame assembly and the third inner support frame assembly after being expanded;

support frame subassembly (11), a pair of all installed at the both ends of interior support frame mechanism (3) holder subassembly (11) are used for supporting the connection support frame mechanism (3) with outer support (1), first interior support frame subassembly in the second support frame subassembly all installs the drainage unit in the third, and the drainage unit encircles the setting of setting up hoop and interval certain distance in interior support frame subassembly, and is three drainage unit communicates each other in order to realize carrying out the drainage to different positions.

2. A hepatobiliary cyst drainage stent according to claim 1, wherein: the retainer assembly (11) comprises a pair of bottom plates, and is a pair of telescopic rods (12) which are fixedly connected with three uniform distributions on the periphery of the side wall of the bottom plates, fixed blocks (13) are fixedly connected with the telescopic ends of the telescopic rods (12) in a rotating mode, the fixed blocks (13) are fixedly connected onto the inner side wall of the outer support (1), and the universal connection assembly is connected with the bottom plates in a pair.

3. A hepatobiliary cyst drainage stent according to claim 2, wherein: universal coupling subassembly includes fixed connection the top first stay tube on the bottom plate bottom, fixed cover has cup jointed the one end of first universal joint (17) on the first stay tube, the second stay tube has been cup jointed in the other end activity of first universal joint (17), the one end of second universal joint (18) has been cup jointed in the other end activity of second stay tube, connection stay tube (28) has been cup jointed in the other end activity of second universal joint (18), the one end of third universal joint (19) has been cup jointed in the other end activity of connection stay tube (28), the other end fixed cup joint of third universal joint (19) has the sleeve pipe, sleeve pipe fixed connection is in the below on the top of bottom plate, first interior stay assembly in the second stay assembly with the stay assembly cup joints in the third respectively the activity first stay tube, The first inner support frame component, the second inner support frame component and the third inner support frame component are all connected with the outer bracket (1).

4. A hepatobiliary cyst drainage stent according to claim 3, wherein: the first inner support frame assembly comprises a first guide disc (5) movably sleeved on the first support pipe, the second support frame assembly comprises a second guide disc (6) movably sleeved on the second support pipe, the third support frame assembly comprises a third guide disc (7) movably sleeved on the connection support pipe (28), the first guide disc (5), the second guide disc (6) and the third guide disc (7) are fixedly sleeved with an outer support disc (8), the periphery of the side wall of the outer support disc (8) is rotatably connected with a plurality of uniformly distributed support rods (9), one end of each support rod (9) is rotatably connected with an arc support rod (10), the arc support rod (10) is fixedly connected on the inner side wall of the outer support frame (1), and limit units are mounted on the first guide disc (5), the second guide disc (6) and the third guide disc (7), the three limiting units are respectively connected with the first supporting pipe, the second supporting pipe and the connecting supporting pipe (28), and the drainage unit is connected with the arc-shaped supporting rod (10).

5. A hepatobiliary cyst drainage stent according to claim 4, wherein: the drainage unit includes fixed connection in snap ring (14) on arc vaulting pole (10), the joint has ripple drainage tube (4) on snap ring (14), a plurality of drainage holes have been seted up on the lateral wall of ripple drainage tube (4), and is three be linked together through a plurality of communicating pipes (16) between ripple drainage tube (4), be located the top fixedly connected with is linked together on the lateral wall of ripple drainage tube (4) grafting pipe (15), grafting pipe (15) are the toper structure, and when drainage support expansion or shrink, ripple drainage tube (4) expand thereupon or reduce.

6. A hepatobiliary cyst drainage stent according to claim 5, wherein: the three limiting units respectively comprise limiting hooks (22) which are rotatably connected to the first guide disc (5), the second guide disc (6) and the third guide disc (7), the three limiting hooks (22) are respectively and fixedly connected with the first guide disc (5), the second guide disc (6) and the third guide disc (7) through torsion springs (23), the side walls of the first supporting tube, the second supporting tube and the connecting supporting tube (28) are respectively and fixedly connected with a limiting clamping plate (20), a plurality of clamping grooves are formed in the side wall of the limiting clamping plate (20), one end of each limiting hook (22) is clamped in one of the clamping grooves, the third guide disc (7) enables the limiting hook (22) to rotate in the moving process and is automatically clamped in the clamping groove in the limiting clamping plate (20) through the torsion springs (23), realize automatic spacing.

7. A hepatobiliary cyst drainage stent according to claim 6, wherein: a pair of first through holes (21) are formed in the first guide disc (5), a second through hole (25) which is coaxial with one of the first through holes (21) is formed in the second guide disc (6), the first through hole (21) and the second through hole (25) are used for passing through a mandril, a first jack (24) is arranged on the first guide disc (5), a second jack (26) is arranged on the second guide disc (6), a third jack (27) is arranged on the third guide disc (7), the first insertion hole (24), the second through hole (25), and the second insertion hole (26) become smaller in order, the opening of the first receptacle (24) is larger than the opening of the second through-hole (25), therefore, when the drainage support is taken out, the ejector rod penetrates through the first insertion hole (24) on the first guide disc (5) to reach the second guide disc (6) and push the limiting hook (22) on the second guide disc (6) to rotate.

8. A hepatobiliary cyst drainage stent according to claim 7, wherein: the bottoms of the three limiting hooks (22) are provided with inclined grooves.

9. A hepatobiliary cyst drainage stent according to claim 3, wherein: the outer support (1) is formed by weaving a plurality of nickel-titanium alloy wires in a crossed mode, and the nickel-titanium alloy wires at the two ends are in arc transition connection.

10. A hepatobiliary cyst drainage stent according to claim 9, wherein: the outer side wall of the outer support (1) is fixedly connected with a plurality of anti-skid balls (2) which are uniformly distributed.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a hepatobiliary cyst drainage stent.

Background

At present, for benign and malignant tumors of biliary tract, a biliary tract plastic stent is placed at the obstruction part of biliary tract lesion to ensure the smoothness of biliary tract system and the normal work of each organ. However, after the biliary tract plastic stent commonly used in clinical practice is placed in a biliary tract lesion obstruction part, the physiological peristalsis of the intestinal tract and the biliary tract is caused due to the contraction of smooth muscles of the intestinal tract and the biliary tract, so that the biliary tract plastic stent is easy to move up and down. And if the stent ages or loses the efficacy, the biliary tract plastic stent is taken out by performing minimally invasive surgery again, which not only increases the pain of the patient, but also increases the infection risk. Therefore, how to prevent the up-and-down displacement of the biliary tract plastic stent at the obstruction part of the biliary tract lesion can be realized.

For example, chinese patent publication No. CN112774004A discloses a biliary tract drainage stent with a groove on the surface, which is characterized in that a plurality of grooves are formed on the outer peripheral wall of the drainage tube, so that the drainage effect is increased by the grooves, and the friction between the drainage tube and the inner wall of the biliary tract is increased, thereby preventing the biliary tract drainage stent from displacing at the obstruction part of biliary tract lesion, and reducing the medical risk.

But has the following disadvantages: the drainage stent can achieve certain positioning and displacement prevention in the biliary tract, but cannot adapt to different biliary tracts, such as the biliary tracts with different thicknesses and diameters at positions where angles exist at the intersection of the biliary tracts, and cannot adjust the diameter of the stent support, so that the anti-infarction effect is poor.

Therefore, the application provides a hepatobiliary cyst drainage stent to meet the requirements.

Disclosure of Invention

An object of the application is to provide a hepatobiliary cyst drainage support, the realization plays the support drainage effect to the biliary tract of difference, and can be according to the big or small demand of opening that the biliary tract struts, adjust, and the different regulation of different positions drainage support opening, the supporting effect has been improved, expand the back to the biliary tract, the pathological change in the biliary tract has been avoided obstructing, the drainage support of being convenient for takes out in the biliary tract, realize that the drainage support is in the biliary tract position department that has the angle, can both realize better supporting role, drainage support's application scope has further been improved.

In order to achieve the above purpose, the present application provides the following technical solutions: a hepatobiliary cyst drainage stent comprises an outer stent, wherein an inner stent mechanism is installed in the outer stent, the inner stent mechanism comprises a first inner stent component, a second inner stent component and a third inner stent component, the first inner stent component, the second inner stent component and the third inner stent component are provided with the same universal connection assembly and can move on the universal connection assembly for supporting the outer stent, limiting units are installed on the first inner stent component, the second inner stent component and the third inner stent component and are used for limiting the positions of the first inner stent component, the second inner stent component and the third inner stent component after being supported; the holder subassembly is all installed at the both ends of interior support frame mechanism, and is a pair of the holder subassembly is used for supporting the connection interior support frame mechanism with the outer support, first interior support frame subassembly in the second support frame subassembly in the third all install the drainage unit, and three drainage unit is linked together.

Preferably, the holder subassembly includes a pair of bottom plate, and is a pair of the three evenly distributed's of the equal fixedly connected with telescopic link of lateral wall border of bottom plate, the fixed end of telescopic link is connected with the fixed block, fixed block fixed connection be in on the inside wall of outer support, universal coupling assembling with a pair of the bottom plate is connected.

Preferably, universal connection subassembly includes fixed connection the top first stay tube on the bottom plate bottom, fixed cover has cup jointed the one end of first universal joint on the first stay tube, the second stay tube has been cup jointed in the other end activity of first universal joint, the one end of second universal joint has been cup jointed in the other end activity of second stay tube, the connection support tube has been cup jointed in the other end activity of second universal joint, the one end of third universal joint has been cup jointed in the other end activity of connection support tube, the fixed cover of the other end of third universal joint has been cup jointed the sleeve pipe, sleeve pipe fixed connection is in the below on the top of bottom plate, first interior support subassembly, second interior support subassembly with third interior support subassembly is cup jointed in the activity respectively on first stay tube, second stay tube and connection support tube, first interior support subassembly, The second inner support frame assembly and the third inner support frame assembly are connected with the outer support.

Preferably, the first inner support frame assembly comprises a first guide disc movably sleeved on the first support tube, the second support frame assembly comprises a second guide disc movably sleeved on the second support tube, the third support frame assembly comprises a third guide disc movably sleeved on the connection support tube, the first guide disc, the second guide disc and the third guide disc are fixedly sleeved with an outer support disc, a plurality of uniformly distributed support rods are rotatably connected to the periphery of the side wall of the outer support disc, one end of each support rod is rotatably connected with an arc support rod, the arc support rod is fixedly connected to the inner side wall of the outer support, limit units are respectively installed on the first guide disc, the second guide disc and the third guide disc, and the three limit units are respectively connected with the first support tube, the second support tube and the connection support tube, the drainage unit is connected with the arc-shaped stay bar.

Preferably, the drainage unit includes fixed connection in snap ring on the arc vaulting pole, the joint has the ripple drainage tube on the snap ring, seted up a plurality of drainage holes on the lateral wall of ripple drainage tube, it is three be linked together through a plurality of communicating pipes between the ripple drainage tube, be located the top fixedly connected with the grafting pipe that is linked together on the lateral wall of ripple drainage tube, the grafting pipe is the toper structure.

Preferably, the three limiting units respectively comprise limiting hooks rotatably connected to the first guide disc, the second guide disc and the third guide disc, the three limiting hooks are respectively connected to the first guide disc, the second guide disc and the third guide disc and provided with torsion springs, the side walls of the first supporting tube, the second supporting tube and the connecting supporting tube are fixedly connected with limiting clamping plates, a plurality of clamping grooves are formed in the side walls of the limiting clamping plates, and one ends of the limiting hooks are clamped in one of the clamping grooves.

Preferably, a pair of first through holes is formed in the first guide disc, a second through hole which is coaxial with one of the first through holes is formed in the second guide disc, the first through hole and the second through hole are used for penetrating through the ejector rod, a first jack is formed in the first guide disc, a second jack is formed in the second guide disc, a third jack is formed in the third guide disc, and the first jack, the second through hole and the second jack are sequentially reduced.

Preferably, the bottoms of the three limiting hooks are provided with inclined grooves.

Preferably, the outer stent is formed by weaving a plurality of nickel-titanium alloy wires in a crossed manner, and the nickel-titanium alloy wires at the two ends are in arc transition connection.

Preferably, a plurality of anti-skid balls which are uniformly distributed are fixedly connected to the outer side wall of the outer support.

In conclusion, the technical effects and advantages of the invention are as follows:

1. the invention has reasonable structure, the ejector rod passes through the first perforation and the second perforation to push the third guide disc to slide on the connecting support tube, the movement of a plurality of support rods is realized, the arc-shaped support rod drives the outer bracket to expand, thereby supporting the biliary tract, simultaneously, the third guide disc drives the limit hook to rotate in the moving process, the third guide disc is automatically clamped in the clamping groove on the limit clamping plate by matching with the torsion spring to realize automatic limit, the bottom of the limit hook is provided with the inclined groove, the limit hook is convenient to rotate when moving, similarly, the first guide disc and the second guide disc are respectively pushed to realize the supporting function of different positions in the biliary tract, and the plurality of anti-slip balls are matched, on one hand, the drainage support is improved to be suitable for different positions in the biliary tract to play a supporting function, the opening degree of the support is adjustable, the practicability of the drainage support is improved, the supporting effect is good, on the other hand, after the biliary tract is expanded, biliary tract internal lesion obstruction is avoided, and the contact area and the friction force between the drainage stent and the inner wall of the biliary tract are further increased, so that the biliary tract drainage stent is less prone to displacement;

2. according to the drainage bracket, the drainage main pipe is inserted into the insertion pipe, the negative pressure device is started, the drainage effect can be realized, the corrugated drainage pipe is enlarged or reduced when the drainage bracket is expanded or contracted by arranging the corrugated drainage pipe, the practicability is improved, drainage for different positions is realized by arranging the three corrugated drainage pipes, the drainage range is improved, the insertion pipe is of a conical structure, the drainage main pipe is conveniently inserted into the insertion pipe, and the convenience in operation is improved;

3. according to the invention, the ejector rod passes through the first jack on the first guide disc and the push limiting hook on the second guide disc to rotate, and under the action of the resilience force of the outer support, the third guide disc is enabled to slide and return along the connecting support tube, the outer support is reduced in size in the position, and similarly, the first guide disc and the second guide disc slide and return, so that the whole outer support is reduced, the drainage support is convenient to take out from the biliary tract, and the taking-out convenience is improved;

4. according to the drainage support, the universal connection assembly is arranged, the second supporting tube is movably sleeved at one end of the first universal joint, the second universal joint is movably sleeved at the other end of the second supporting tube, the supporting tube is movably sleeved at the other end of the second universal joint, one end of the third universal joint is movably sleeved at the other end of the connecting supporting tube, the relative distances among the first supporting tube, the second supporting tube and the connecting supporting tube are extended and shortened, the angle is changed, the angle adjusting range is enlarged, the drainage support can be supported at the position of a biliary tract with the angle, and the application range of the drainage support is further enlarged.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic perspective view of a hepatobiliary cyst drainage stent;

FIG. 2 is a schematic diagram of a three-dimensional structure of the inner support mechanism, the retainer assembly, and the drainage unit;

FIG. 3 is a schematic view of the front structure of the inner support frame mechanism, the retainer frame assembly and the drainage unit;

FIG. 4 is a schematic diagram of a three-dimensional structure of the inner support mechanism and the retainer assembly;

FIG. 5 is an enlarged perspective view of the first guiding plate;

FIG. 6 is an enlarged perspective view of the second guiding plate;

FIG. 7 is an enlarged perspective view of the third guiding plate;

fig. 8 is an enlarged schematic view of a portion a in fig. 4.

In the figure: 1. an outer support; 2. an anti-skid ball; 3. an inner support frame mechanism; 4. a corrugated drainage tube; 5. a first guide plate; 6. a second guide plate; 7. a third guide plate; 8. an outer support tray; 9. a support bar; 10. an arc stay bar; 11. a cage assembly; 12. a telescopic rod; 13. a fixed block; 14. a snap ring; 15. inserting a pipe; 16. a communicating pipe; 17. a first universal joint; 18. a second universal joint; 19. a third universal joint; 20. a limiting clamping plate; 21. a first perforation; 22. a limiting hook; 23. a torsion spring; 24. a first jack; 25. a second perforation; 26. a second jack; 27. a third jack; 28. is connected with the supporting tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1-8, a hepatobiliary cyst drainage stent includes an outer stent 1, an inner stent mechanism 3 is installed in the outer stent 1, the inner stent mechanism 3 includes a first inner stent assembly, a second inner stent assembly, and a third inner stent assembly, the number of the inner stent assemblies is not limited to three, in other embodiments, 2-7 are preferable, the same universal connection assembly is installed on the first inner stent assembly, the second inner stent assembly, and the third inner stent assembly, and can move on the universal connection assembly, and is used for supporting the outer stent 1, and limiting units are installed on the first inner stent assembly, the second inner stent assembly, and the third inner stent assembly, and are used for limiting the positions of the first inner stent assembly, the second inner stent assembly, and the third inner stent assembly after being supported; the two ends of the inner support frame mechanism 3 are respectively provided with a retainer assembly 11, the retainer assemblies 11 are used for supporting and connecting the inner support frame mechanism 3 and the outer support frame 1, the first inner support frame assembly, the second inner support frame assembly and the third inner support frame assembly are respectively provided with a drainage unit, and the three drainage units are communicated.

As an implementation manner in this embodiment, the retainer assembly 11 includes a pair of bottom plates, the circumference of the side walls of the pair of bottom plates is fixedly connected with three evenly distributed telescopic rods 12, the telescopic ends of the telescopic rods 12 are fixedly and rotatably connected with a fixed block 13, the fixed block 13 is fixedly connected on the inner side wall of the outer bracket 1, the universal connection assembly is connected with the pair of bottom plates, the universal connection assembly includes a first support pipe fixedly connected on the bottom of the uppermost bottom plate, one end of a first universal joint 17 is fixedly sleeved on the first support pipe, the other end of the first universal joint 17 is movably sleeved with a second support pipe, the other end of the second support pipe is movably sleeved with one end of a second universal joint 18, the other end of the second universal joint 18 is movably sleeved with a connection support pipe 28, the other end of the connection support pipe 28 is movably sleeved with one end of a third universal joint 19, the extension and the shortening of the relative distance among the first supporting pipe, the second supporting pipe and the connecting supporting pipe 28 are realized, the adjustment of the angle is increased, the other end of the third universal joint 19 is fixedly sleeved with a sleeve, the sleeve is fixedly connected to the top of the bottom plate at the bottom, the first inner supporting frame assembly, the second inner supporting frame assembly and the third inner supporting frame assembly are movably sleeved on the first supporting pipe, the second supporting pipe and the connecting supporting pipe 28 respectively, and the first inner supporting frame assembly, the second inner supporting frame assembly and the third inner supporting frame assembly are connected with the outer support 1.

In this embodiment, the first inner support frame assembly comprises a first guide plate 5 movably sleeved on the first support tube, the second support frame assembly comprises a second guide plate 6 movably sleeved on the second support tube, the third support frame assembly comprises a third guide plate 7 movably sleeved on the connection support tube 28, the first guide plate 5, the second guide plate 6 and the third guide plate 7 are fixedly sleeved with an outer support plate 8, the periphery of the side wall of the outer support plate 8 is rotatably connected with a plurality of uniformly distributed support rods 9, one end of each support rod 9 is rotatably connected with an arc support rod 10, the arc support rod 10 is fixedly connected on the inner side wall of the outer support 1, the first guide plate 5, the second guide plate 6 and the third guide plate 7 are respectively provided with a limiting unit, the three limiting units are respectively connected with the first support tube, the second support tube and the connection support tube 28, the drainage unit is connected with the arc support rod 10, when the first guide disc 5, the second guide disc 6 and the third guide disc 7 respectively slide on the first support pipe, the second support pipe and the connection support pipe 28, the plurality of support rods 9 are respectively pushed to move, so that the arc-shaped support rods 10 drive the outer support 1 to expand or contract to move, and the inner diameters of the outer support 1 can be adjusted in different sizes at different positions.

In this embodiment, the drainage unit includes snap ring 14 of fixed connection on arc vaulting pole 10, the joint has ripple drainage tube 4 on snap ring 14, a plurality of drainage holes have been seted up on ripple drainage tube 4's the lateral wall, be linked together through a plurality of communicating pipes 16 between the three ripple drainage tube 4, be located the grafting pipe 15 that fixedly connected with is linked together on the lateral wall of ripple drainage tube 4 of the top, grafting pipe 15 is the toper structure, be responsible for the drainage and peg graft on grafting pipe 15, open the negative pressure ware, can realize the drainage effect, through setting up ripple drainage tube 4, realize that ripple drainage tube 4 enlarges or reduces, improve the practicality, through setting up three ripple drainage tube 4, the realization is directed at different positions and is drained, improve the drainage scope, grafting pipe 15 is the toper structure, be convenient for the drainage person in charge pegs graft on grafting pipe 15, improve the convenience of operation.

In this embodiment, the three limiting units respectively include limiting hooks 22 rotatably connected to the first guiding disc 5, the second guiding disc 6 and the third guiding disc 7, the three limiting hooks 22 are respectively connected to the first guiding disc 5, the second guiding disc 6 and the third guiding disc 7, the side walls of the first supporting tube, the second supporting tube and the connecting supporting tube 28 are respectively and fixedly connected with a limiting clamping plate 20, the side wall of the limiting clamping plate 20 is provided with a plurality of clamping grooves, one end of each limiting hook 22 is clamped in one of the clamping grooves, the first guiding disc 5 is provided with a pair of first through holes 21, the second guiding disc 6 is provided with a second through hole 25 coaxially arranged with one of the first through holes 21, the first through hole 21 and the second through hole 25 are both used for passing through the ejector rod, the first guiding disc 5 is provided with a first insertion hole 24, and the second guiding disc 6 is provided with a second insertion hole 26, Third jack 27 has been seted up on third guiding disc 7, first jack 24, the second is perforated 25, second jack 26 diminishes in proper order, the inclined groove has all been seted up to three spacing hook 22's bottom, first guiding disc 5, second guiding disc 6 and third guiding disc 7 remove to make and drive spacing cardboard 20 respectively and rotate, cooperation torsion spring 23, automatic joint is in the draw-in groove, realize automatic limiting displacement, through setting up first jack 24, the second is perforated 25, second jack 26, and diminish in proper order, be convenient for the ejector pin pass first guiding disc 5, second guiding disc 6, promote spacing hook 22 and rotate, it is spacing to relieve.

As an implementation manner in this embodiment, the outer stent 1 is formed by alternately weaving a plurality of nitinol wires, and the nitinol wires at both ends are in arc transition connection, and the outer sidewall of the outer stent 1 is fixedly connected with a plurality of evenly distributed anti-slip balls 2, so that the purpose of the arrangement is to further increase the contact area and the friction force between the drainage stent and the inner wall of the biliary tract, so that the biliary tract drainage stent is less prone to displacement.

The working principle of the invention is as follows:

firstly, adjusting a drainage stent to be in a minimum state, and placing the drainage stent at a position in a biliary tract by an anastomat or other operation tools;

when different positions in the biliary tract need to be propped open, the ejector rod penetrates through the first through hole 21 and the second through hole 25 to push the third guide disc 7 to slide on the connecting support tube 28, so that the plurality of support rods 9 can move to enable the arc-shaped support rod 10 to drive the outer bracket 1 to expand, thereby supporting the biliary tract, meanwhile, the third guide disc 7 can enable the limit hook 22 to rotate in the moving process, the limit hook 22 is automatically clamped in the clamping groove on the limit clamping plate 20 in a matching manner by matching with the torsion spring 23 to realize automatic limit, the bottom of the limit hook 22 is provided with the inclined groove, so that the limit hook 22 can rotate when moving, and similarly, the first guide disc 5 and the second guide disc 6 are respectively pushed to realize the supporting function at different positions in the biliary tract and match with the plurality of anti-skid balls 2, on one hand, the drainage support is improved to be suitable for different positions in the biliary tract to play a supporting function, and the opening degree of the support can be adjusted, the practicability of the drainage stent is improved, the supporting effect is good, on the other hand, after the biliary tract is expanded, the biliary tract internal lesion obstruction is avoided, the contact area and the friction force between the drainage stent and the inner wall of the biliary tract are further increased, and the biliary tract drainage stent is not easy to displace;

during drainage, the main drainage pipe is inserted into the insertion pipe 15, the negative pressure device is started, the drainage effect can be realized, the corrugated drainage pipe 4 is arranged, when the drainage support is expanded or contracted, the corrugated drainage pipe 4 is expanded or contracted, the practicability is improved, drainage at different positions is realized by arranging the three corrugated drainage pipes 4, the drainage range is improved, the insertion pipe 15 is of a conical structure, the main drainage pipe is conveniently inserted into the insertion pipe 15, and the convenience in operation is improved;

when the drainage support is taken out, the ejector rod penetrates through the first insertion hole 24 on the first guide disc 5 to reach the second guide disc 6 and pushes the limiting hook 22 on the second guide disc 6 to rotate, under the action of the resilience force of the outer support 1, the third guide disc 7 slides and returns along the connecting support tube 28, and the outer support 1 is reduced in the position;

through setting up universal coupling assembling, the second stay tube has been cup jointed in the one end activity of first universal joint 17, the second universal joint 18 is cup jointed in the other end activity of second stay tube, the other end activity of second universal joint 18 cup joints connection support pipe 28, the one end of third universal joint 19 is cup jointed in the other end activity of connection support pipe 28, cup joint through the activity, realize first stay tube, relative distance's extension and shortening between second stay tube and the connection support pipe 28, and the change of angle, increase the control range of angle, realize that drainage support is in the biliary tract position department that has the angle, can both realize better supporting role, drainage support's application scope has further been improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.