CN201194856Y

CN201194856Y - Helix biliary tract stent

Info

Publication number: CN201194856Y
Application number: CNU200820057989XU
Authority: CN
Inventors: 全志伟; 李济宇; 李松岗; 刘颖斌; 王俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-04
Filing date: 2008-05-04
Publication date: 2009-02-18
Anticipated expiration: 2018-05-04

Abstract

The utility model discloses a helical locking biliary tract mount which is formed by the way that a nickel and titanium alloy bar with an S-shaped section which is performed the memory training is spirally wound and each helix and the adjacent helix are locked mutually. The helical locking biliary tract mount combines the characteristics of a metal network and a macromolecular tubular bracket, can further improve the treatment effect of a patient having biliary tract neoplasm by the bracket, and increase the life cycle of the patient.

Description

A kind of spiral biliary tract rack

Technical field

This utility model relates to a kind of biliary tract endoscopic instruments, relates in particular to a kind of spiral biliary tract rack.

Background technology

In the clinical disease, biliary tract feel sick block many by cancer of biliary duct, carcinoma of gallbladder, hepatocarcinoma, carcinoma of head of pancreas, carcinoma of ampulla or other metastatic carcinomas to due to the compressing of bile duct, cholestasis causes liver function damage in liver, pernicious complication such as biliary tract infection, this type of patient often health whole body situation is poor, and success rate of operation is low.For such situation, adopt palliative therapy method at present clinically, to reach the unobstructed purpose that keeps biliary tract over a period to come at narrow section biliary tract implant frame.

Present support roughly is divided into metal net shaped support and macromolecule cast support.Wherein metal net shaped support expansion back diameter can reach 7～10mm, keep the unobstructed effect of biliary tract good long with the time, can merge with the tissue of periphery after but its network structure causes it to implant and can't take out, when taking place to stop up, support can implant a new support again at former backing positions, therefore the internal diameter of biliary tract can be irreversible more and more littler, price is high in addition, is roughly 10 times of polymeric stent; Polymeric stent can not be expanded, its internal diameter is 2～3mm, keep the unobstructed time of biliary tract short, obstruction of stent just takes place in a short time after often implanting, but its structures shape its can in biliary tract, take out, often need constantly more to renew support so implant the patient of polymeric stent, to keep the unobstructed property of biliary tract.

For above-mentioned two kinds of supports, it cuts both ways, thus with both advantages together, design novel support, it comprises: 1, can be expanded to bigger diameter, increase the unimpeded time of support; 2, tubular structure prevents that support and biliary tract tissue from merging and can't take out; 3, less axial shrinkage rate in the support process of expansion reduces support implant surgery difficulty; 4, provide higher intensity, prevent oncothlipsis and cause that support subsides etc., can further improve tumor of biliary tract patient's stent in the treatment effect undoubtedly, increase patient's life cycle.

Summary of the invention

The purpose of this utility model is to provide a kind of novel spiral biliary tract rack.

In order to achieve the above object, the technical solution adopted in the utility model is:

Support is a helical form.

Described support is by the nickel titanium alloy through memory training, and material section is " S " type, and material is according to clockwise or counterclockwise coiled.

The mutual snap close in cross section of adjacent two spiral utilizations " S " type in the described spiral.

The two ends of described support are respectively equipped with right angle clamp and curved clamp.

The beneficial effect that the utlity model has is:

Combine the characteristics of metal net shaped support and macromolecule tubulose support, it is reached: 1, can be expanded to bigger diameter; 2, tubular structure; 3, in the support process of expansion, less axial shrinkage rate; 4, provide higher tube wall strength.

Description of drawings

Fig. 1 is the axonometric chart of a direction of the present utility model;

Fig. 2 is the axonometric chart of another direction of the present utility model;

Fig. 3 is the profile of coil material of the present utility model;

Sectional side elevation when Fig. 4 is a contraction state of the present utility model;

Adjacent helical latch situation sketch map when Fig. 5 is a contraction state of the present utility model;

Sectional side elevation when Fig. 6 is an expansion state of the present utility model;

Adjacent helical latch situation sketch map when Fig. 7 is an expansion state of the present utility model;

Among the figure: 1, support; 2, right angle clamp; 3, curved clamp; 4, " S " type section material; 5, stuck point.

The specific embodiment

As Fig. 1, Fig. 2, shown in Figure 3, it is the nickel titanium alloy through memory training of " S " type that this utility model adopts the cross section, adopt certain device and device according to clockwise or counterclockwise coiled, the material of both helical ends carries out bending to be handled, one end forms right angle clamp 2, and the other end forms curved clamp 3.

As Fig. 4, shown in Figure 5, among the present invention, adjacent two spirals prevent that by the stuck point 5 mutual snap closes on " S " type section material 4 two adjacent spirals break away from.When support 1 was in contraction state, the diameter of support 1 was less relatively, and the stuck point of adjacent two spirals 5 is at a distance of farthest, thereby pitch is also minimum.

As Fig. 6, shown in Figure 7, because the effect of Ultimum Ti, when support 1 is in expansion state, support 1 expanded in diameter, axial length can shorten along with the expansion of diameter.But because pitch can become big gradually under the effect of memorial alloy, the distance of adjacent two stuck points 5 diminishes gradually, reaches maximum pitch until contact, thereby has offset the axial shrinkage of part.

When clinical practice, the support that will be in contraction state by paths such as choledochoscope, ERCP, PTC is positioned in the narrow biliary tract, discharge right angle clamp 2 and curved clamp 3 on the support, because it is the effect of Ultimum Ti, support are expanded voluntarily that narrow biliary tract support is big, on the other hand, because the snap action of adjacent spiral, make the no mesh in support 1 expansion back, can prevent that therefore tumor tissues from growing in the support, possibility can also be provided for the taking-up of support 1.

The above-mentioned specific embodiment is used for this utility model of explaining; rather than this utility model limited; in the protection domain of spirit of the present utility model and claim, any modification and change to this utility model is made all fall into protection domain of the present utility model.

Claims

1. spiral biliary tract rack, it is characterized in that: support is a helical form.

2. a kind of spiral biliary tract rack according to claim 1 is characterized in that: described support is by the nickel titanium alloy through memory training, and material section is " S " type, and material is according to clockwise or counterclockwise coiled.

3. a kind of spiral biliary tract rack according to claim 1 is characterized in that: the mutual snap close in cross section of adjacent two spiral utilizations " S " type in the described spiral.

4. a kind of spiral biliary tract rack according to claim 1 is characterized in that: the two ends of described support are respectively equipped with right angle clamp and curved clamp.