CN203354690U

CN203354690U - Stent-graft dilator

Info

Publication number: CN203354690U
Application number: CN 201320298302
Authority: CN
Inventors: 郭伟; 马晓辉
Original assignee: 郭伟; 马晓辉
Current assignee: Chinese Pla General Hospital
Priority date: 2013-05-29
Filing date: 2013-05-29
Publication date: 2013-12-25
Anticipated expiration: 2023-05-29

Abstract

The utility model discloses a stent-graft dilator which is used for dilating and positioning a stent-graft when the stent-graft is installed. The stent-graft dilator structurally comprises three components, namely a sheath tube, a sprinkle head and a pull rod. The front end portion of the sheath tube is slightly swelled and used for containing the sprinkle head in a folded state. The pull rod is a metal cable which is sleeved with the sheath tube. The sprinkle head is composed of not less than two elastic metal wires, wherein the two tips of each metal wire are both welded to the front tip of the pull rod. The stent-graft dilator can be used for dilating and positioning the stent-graft under the condition of not blocking blood flow, thereby being particularly suitable for installing the stent-graft in the aorta.

Description

A kind of stent dilator

Technical field

The present invention relates to the medical apparatus and instruments used to human body mounting bracket type blood vessel the time, particularly, at aortic arch mounting bracket type blood vessel, make stent expand utensil in place.

Background technology

Implant frame type blood vessel is with shutoff arterial wall intimal tear or aneurysm, is to rescue at present artery dissection or aneurysm is commonly used and effective treatment means.In the operation of implant frame type blood vessel, after stent is discharged into to target location, need to give expansionary force from the stent inwall, the shape of stent and human vas is adapted, and docile combination.At present for the most of position of human body mounting bracket type blood vessel, all use a kind of instrument that is called sacculus, to sacculus, inject contrast medium, make inflation, complete this task.

The human body thoracic aorta is that artery dissection or aneurysmal position easily occur, also need to be with stent shutoff arterial wall intimal tear or aneurysm cavity.Yet thoracic aorta position mounting bracket type blood vessel but can not use sacculus realize stent more closely docile in blood vessel.Its reason is, thoracic aorta is centrifugal dirty very near, and blood stream pressure is very high, and sacculus is not easy to open; If use very large pressure bursts that sacculus is opened, at aorta, form temporary transient bloodstream blocking, the blood that heart is put out only had part to flow to head originally, the blood that heart is put out after the thoracic aorta bloodstream blocking all rushes at head section and upper limb, be that head blood vessel and organ can not bear, must cause damage to a certain degree.Therefore, clinical treatment needs a kind of being applicable to, when thoracic aorta mounting bracket type blood vessel, stent is implemented to expansion device in place.

The utility model content

The technical problems to be solved in the utility model is, a kind of apparatus is provided, and to aortic arch mounting bracket type blood vessel the time, uses it, under the prerequisite of not blocking the aortic arch blood flow, can make the stent expansion in place.The stent that the designer makes to be installed on the thoracic aorta position by this replacement sacculus is expanded device in place and is called the stent dilator.

This utility model stent dilator comprises sheath pipe, the fluffy head of umbrella and three parts of pull bar.The sheath pipe is that certain rigidity is arranged, and certain toughness and elasticity are arranged again, can make certain crooked tubule with the blood vessel traveling; Pull bar is a mfg. metal cord, is placed in the sheath pipe, can in the sheath pipe, slide front and back; The fluffy head of umbrella has elastic tinsel and forms by being no less than two, and the two ends of every one metal wire all is welded in the pull bar front end, and under unbound state, every one metal wire is all upheld as ring shape.Many one metal wires are upheld simultaneously, just form the spherical or ovoid of a fluffy shape.Quality wiry also should have pliability, can not fracture it being smoothed out with the fingers into when a branch of.

This utility model stent dilator is under resting state, and by the tractive of pull bar, the tinsel of the fluffy head of umbrella is smoothed out with the fingers slivering bundle shape, is contracted in the tube chamber of sheath pipe leading section.During use, when sheath pipe front end enters into target location, pushing drawing rod, the fluffy head of umbrella is emerged from sheath pipe front port, upholds into the spherical or ovoid of a fluffy shape, and transverse diameter spherical or ovoid is greater than the internal diameter of stent, stent is formed to an expansionary force, make the stent expansion in place.In place dissatisfied at stent, or need to, when the upper and lower different parts application of force is expanded, can, by the push-and-pull pull bar, the fluffy head of umbrella " retract-stretch out " be carried out several times repeatedly to longer stent.

The many one metal wires that form the fluffy head of umbrella can be equal in length, and after launching, the wall of the fluffy head of umbrella is roughly a level, is called A kind version; The many one metal wires that form the fluffy head of umbrella can be also that length is unequal, after expansion, longer tinsel forms larger spherical of outer internal diameter, and shorter tinsel forms less spherical at internal layer, the wall of the fluffy head of umbrella is roughly many levels, and this is called B kind version.These two kinds of versions can be analogous to hollow ball and medicine ball, clinically, can select application according to the state of an illness of case individuality.Wherein, the tinsel quantity that A kind version is used will be lacked than B kind version, to the resistance less of blood flow, formed spherical more regular after expansion; And the expansionary force after the expansion of B kind version is more solid more reliable than A kind version.

As optimization, every one metal wire two ends is positioned at two end points in 180 °, pull bar cross section at the pad of pull bar front end.With the dial plate representation, wherein two of an one metal wire the pads of termination in the pull bar termination are respectively 3 points, 9 points, and the pad of two terminations of another one metal wire in the pull bar termination is 6 points, 12 points, by that analogy remaining.More regular when so layout can make the fluffy head of umbrella open, whole umbrella subglobular on fluffy first watch is more even to the expansion pressure of stent inwall.

The accompanying drawing explanation

Fig. 1 is this utility model stent dilator using state structural representation;

Fig. 2 is this utility model stent dilator resting state structural representation.

The parts that number in the figure is represented or position are: 1-sheath pipe; 2-sheath pipe leading section; 3-pull bar; 4-pull bar front end; 5-pull bar hands handle; The fluffy head of 6-umbrella.

The specific embodiment

Below by drawings and Examples, the utility model is described in further detail.

As depicted in figs. 1 and 2, adopt the metal material with suitable rigidity and toughness to make sheath pipe 1 and pull bar 3, bending to a certain degree can occur with the traveling of blood vessel after inserting arteries in sheath pipe 1.As shown in Figure 2, this utility model stent dilator is under resting state, and fluffy 6 tinsels of umbrella are amounted to and are bar bundle shape and shrink in sheath pipe 1 leading section.Pull bar 3 is placed in sheath pipe 1 intracavity, and can slide front and back.Pull bar 3 front ends 4 are bulge slightly, and fluffy 6 each each termination wiry of umbrella all is welded in pull bar 3 front ends 4.Fluffy 6, umbrella forms by being no less than 2 one metal wires, and each tinsel can be isometric, also can be not isometric.Illustrated embodiment has adopted 6 isometric tinsels.Every one metal wire two ends is equivalent on pull bar front end 4 cross sections 180 ° at the interval of the solder joint of pull bar front end 4.All welded wire points are evenly arranged at pull bar front end 4 peripheries.The tinsel that the formation umbrella is fluffy 6 is selected has enough elasticity and the making of flexible metal material.

Claims

1. a stent dilator makes stent expand use in place when mounting bracket type blood vessel, it is characterized in that, its structure comprises sheath pipe, the fluffy head of umbrella and three parts of pull bar, and described sheath pipe is the tubule that can hold fluffy tinsel of umbrella and pull bar; Pull bar is a mfg. metal cord, is placed in the sheath pipe, can in the sheath pipe, slide front and back; The fluffy head of umbrella has elastic tinsel and forms by being no less than two, and the two ends of every one metal wire all is welded in the pull bar front end.

2. stent dilator according to claim 1, is characterized in that, each tinsel that forms the fluffy head of umbrella is equal in length.

3. stent dilator according to claim 1, is characterized in that, each tinsel length that forms the fluffy head of umbrella does not wait.

4. according to the described stent dilator of claim 2 or 3, it is characterized in that, every one metal wire two ends is positioned at two points in 180 °, pull bar cross section at the pad of pull bar front end.