CN201200504Y

CN201200504Y - Anti-refulx bile duct metal stent with valve

Info

Publication number: CN201200504Y
Application number: CNU2008200580026U
Authority: CN
Inventors: 王洛伟; 李兆申; 陆伟
Original assignee: Second Military Medical University SMMU
Current assignee: Second Military Medical University SMMU
Priority date: 2008-05-04
Filing date: 2008-05-04
Publication date: 2009-03-04
Anticipated expiration: 2018-05-04

Abstract

The utility model relates to a metal support with a valve anti-reflux bile duct, which comprises a tubular support (1) and an anti-reflux valve (2) arranged in the tubular support (1), wherein the tubular support (1) is formed by weaving memorial alloy in a super elastic shape and is tubular and comprises a duodenum end (11), an anti-reflux valve part (12) and a bile duct inner end (13); the anti-reflux valve part (12) is provided with a one-way passing anti-reflux valve (12); the anti-reflux valve (2) comprises a valve support (21) and a valve leaf (22); and arches protrude towards the bile duct inner end (13) of the support, and the top parts of the three arches of the valve support (21) are sewed and fixed on the anti-reflux valve part (12) of the tubular support. The utility model not only realizes the curing function that the support is used for bile duct obstruction cure, biliary drainage and jaundice reduction, but also can effectively prevent the duodenum content from reflowing into the biliary system, lightens complicating diseases like cholangitis after the support is placed, therefore, the utility model more accords with the physiological function.

Description

The anti-bile duct metal rack that backflows of band valve

Technical field

This utility model relates to medical instruments field, relates in particular to a kind of metal rack.

Background technology

Biliary tract, pancreas and part digestive system tumor, as malignant tumor portal lymph nodes such as common bile duct cancer, hilar cholangiocarcinoma, cancer of pancreas, carcinoma of ampulla, hepatocarcinoma, bile duct metastatic carcinoma and stomach, colon, mammary gland transfer usually causing obstruction of bile duct, cause severe jaundice, have a strong impact on patient's quality of life.(Carrasco CH such as Carrasco in 1985, Wallace S, Charnsangavej CH, et al.Expandable biliary endoprosthesis:an experimental study.Am J Roentgenol, 1985,145 (6): 1279-1281) use biliary tract rack and carry out the zoopery achieving success.From 1989, each big scope center was widely used in clinically biliary metallic stents treatment malignant biliary obstruction in the world, and China also carries out in the early 1990s places the metal biliary tract rack and treat obstruction of biliary tract due to the malignant tumor scope under.At present, this technology has become one of common method of treatment of various malignant biliary obstruction.But, cause that easily the duodenum content backflows into biliary tract, causes complication such as cholangitis owing to lost the normal physiological function of bile duct and teat sphincter behind the placing rack.

Summary of the invention

Technical problem to be solved in the utility model provides the anti-bile duct metal rack that backflows of a kind of band valve, and the duodenum content backflows into the defective of biliary tract in the solution prior art.

Technical scheme

The anti-bile duct metal rack that backflows of a kind of band valve, by tubular bracket with place the anti-valve that backflows in it to form, tubular bracket is formed by the super-elastic shape memory alloy wire braiding, is straight tube-like, divides duodenum end, the anti-valve portion of backflowing, bile duct the inner three parts; The described anti-valve portion of backflowing is provided with unidirectional by the anti-valve that backflows, and the anti-valve that backflows is made up of valve bracket and lobe leaf, and valve bracket is folded into three identical circular arcs by super-elastic shape memory alloy wire and forms a circle, and is the SANYE flap; Lobe leaf attachment margin is fixed on the curved metal silk of valve bracket with suturing with thread management; The anti-valve that backflows places the inner chamber of tubular bracket (1), and arc is protruding in bile duct the inner of support, with line with 3 arc top sutured of valve bracket in the anti-valve portion of backflowing of tubular bracket.

All be equipped with radiopaque marker on described duodenum end and bile duct the inner.

When implanting, routinely the anti-bile duct metal rack that backflows of this utility model band valve is compressed in the conduit, utilize delivery sheath to pass through the scope service aisle again and insert the bile duct chamber through vater's papilla, discharge support after crossing narrow section, support resiles, the inner about 2cm of the section of blocking that surpasses of bile duct, the valve in the support substitutes the normal physiological function of former bile duct and teat sphincter.Bile content increases in the bile duct, and pressure raises, and the closed place of three lobe leaf free edges is washed open, and bile successfully enters duodenum, and when the duodenum internal pressure raise, the free edge of valve was drawn close closure to the centre, the blocking-up duodenum content bile duct that backflows.

Beneficial effect

This utility model tubular bracket is formed by the super-elastic shape memory alloy wire braiding, and cradle wall is thin submissive, and compression not only is convenient to insert conduit easily, can use thinner delivery sheath, can also alleviate damage.

Because of lobe leaf sutured on valve bracket, not yielding, easy to operate when not only being sutured in tubular bracket, and can not be shifted after implanting, guarantee curative effect.

This utility model had both been realized the stent in the treatment obstruction of bile duct, and bile drainage alleviates the therapeutical effect of jaundice, can prevent effectively that again the duodenum content from backflowing into biliary system simultaneously, alleviate support and placed complication such as back cholangitis, more meet physiological function.

Description of drawings

Fig. 1 is the anti-support overall structure sketch map that backflows of this utility model band valve;

Fig. 2 is a tubular bracket structural representation of the present utility model;

Fig. 3 is a valve bracket structural representation of the present utility model;

Fig. 4 is the lobe impeller structure sketch map of valve of the present utility model.

The specific embodiment

Below in conjunction with specific embodiment, further set forth this utility model.Should be understood that these embodiment only to be used to this utility model is described and be not used in the restriction scope of the present utility model.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read this utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Embodiment 1

As shown in the figure, the anti-bile duct metal rack that backflows of a kind of band valve, by tubular bracket 1 with place the anti-valve 2 that backflows in it to form, tubular bracket 1 is woven by super-elastic shape memory alloy wire and forms, be straight tube-like, divide duodenum end 11, the anti-valve portion 12 of backflowing, inner 13 3 parts of bile duct; The described anti-valve portion 12 of backflowing is provided with unidirectional by the anti-valve 2 that backflows, and the anti-valve 2 that backflows is made up of valve bracket 21 and lobe leaf 22, and valve bracket 21 is folded into three identical circular arcs by super-elastic shape memory alloy wire and forms a circle, and is the SANYE flap; Lobe leaf 22 attachment margin are fixed on the curved metal silk of valve bracket with suturing with thread management; The anti-valve 2 that backflows places the inner chamber of tubular bracket 1, and arc is protruding in bile duct the inner 13 of support, with line with 3 arc top sutured of valve bracket 21 in the anti-valve portion 12 of backflowing of tubular bracket; All be equipped with radiopaque marker 3 on described duodenum end 11 and bile duct the inner 13.

Tubular bracket 1 usefulness niti-shaped memorial alloy silk is made, alloy filament diameter 0.18mm, weave with the netting mould earlier, after finishing, braiding utilizes the compacting of support mould again, heat treatment, typing at last, support is long tubular, can make the 5cm6cm8cm10cm equal length, internal diameter 6mm 7mm 8mm 10mm 12mm specifically selects according to stenosis of bile duct length, degree during clinical practice.The anti-valve 2 that backflows is arranged in apart from duodenum end 11 place of 2cm.

The bifilar niti-shaped memorial alloy silk of valve bracket 21 usefulness is made, and alloy filament diameter 0.25mm utilizes lobe ring mould to be folded into three identical arc-shaped structures, arc length 28mm.Lobe leaf 22 is to pack work with fresh Cor Sus domestica, remove surface impurity routinely, 0.25% trypsinization goes cell to handle, giving 0.6% glutaraldehyde soaked after 36 hours, phosphate buffer (PBS) washes repeatedly, the valve mould that utilization prepares, with pericardium be trimmed to three block sizes identical with lobe leaf valve bracket coupling.Be sewn onto on the valve bracket of bifilar nitinol alloy wire making needle gage 1mm with 7-0 prolene suture (PROLENE).The anti-valve 2 that backflows is placed the inner chamber of tubular bracket 1, and arc is protruding in bile duct the inner 13 of support, the arc lobe top stitch of valve bracket is fixed in the anti-valve portion 12 of backflowing of tubular bracket 1 with 4-0 prolene suture (PROLENE).

Claims

1. a band valve prevents backflowing the bile duct metal rack, by tubular bracket (1) with place the anti-valve that backflows (2) in it to form, tubular bracket (1) is formed by the super-elastic shape memory alloy wire braiding, be straight tube-like, divide duodenum end (11), anti-backflow valve portion (12), bile duct the inner (13) three parts; It is characterized in that: the described anti-valve portion (12) of backflowing is provided with unidirectional by the anti-valve (2) that backflows, the anti-valve (2) that backflows is made up of valve bracket (21) and lobe leaf (22), valve bracket (21) is folded into three identical circular arcs by super-elastic shape memory alloy wire and forms a circle, and is the SANYE flap; Lobe leaf (22) attachment margin is fixed on the curved metal silk of valve bracket with suturing with thread management; The anti-valve (2) that backflows places the inner chamber of tubular bracket (1), and arc is protruding in bile duct the inner (13) of support, with line with 3 arc top sutured of valve bracket (21) in the anti-valve portion (12) of backflowing of tubular bracket.

2. the anti-bile duct metal rack that backflows of band valve as claimed in claim 1 is characterized in that: all be equipped with radiopaque marker (3) on described duodenum end (11) and bile duct the inner (13).