CN2322571Y

CN2322571Y - Intravascular support with axial length compensation

Info

Publication number: CN2322571Y
Application number: CN98203487U
Authority: CN
Inventors: 陈洁
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-17
Filing date: 1998-04-17
Publication date: 1999-06-09
Anticipated expiration: 2008-04-17

Abstract

The utility model discloses an intravascular bracket with axial length compensation, which is used for treating the infarct diseases of angiostenosis and is composed of a plurality of rings. Each ring is composed of continuous a plurality of folding lines or curvilinear figures or the adjacent folding lines of continuous adjacent rings or the axial length compensator of the acme of the curvilinear figures. When the rings are dilated along a radial direction, the axial length compensator is used for giving compensation on axial length.

Description

Endovascular stent with axial length compensation

This utility model relates to the endovascular stent with axial length compensation that is applicable to the obstructive illness treatment of angiostenosis.

As everyone knows, percutaneous now has been widely used in treating clinically the obstructive illness of angiostenosis through the angioplasty (PTA) of tube chamber, when stating plasty on the implementation, must make the support in the implantable intravascular should be distensible at least diametrically, and the existing many people of such support propose various scheme, comprise the self expandable spring type, the compression spring type, the extension fixture of mechanism, heat effect distensible devices etc., wherein with spring type be common, they all are to be entwined by different way with stainless steel silk.For example, disclosed International Patent Application WO 92/09246 in 1992, inventor Tower Allen J. has proposed a kind of radially expansible support, this support replaces the spiral band that the circle of reverse ellipse garden shape forms by finer wire and constitutes, after it is in the reeling condition implantable intravascular, in case its reeling condition is discharged, and support distends the blood vessels under the elastic restoring force effect.April 26 nineteen ninety-five disclosed Chinese patent CN 2195343 Y, Xu Wenchong etc. disclose and another kind ofly have been woven into along its length support with the closely linked netted garden tubular of garden Zhou Fangxiang with diameter less than the stainless steel silk of 0.1mm, this support adopts and is similar to knitting wool weaving manner formation, obviously, it is disclosed that the performance of this support is better than WO 92/09246, because it is to the support of the angiectatic strong point far more than WO 92/09246, thereby blood vessel can expanded uniformly under the stress.Also having a kind of support that is made of filament is the U.S. on the 25th patent US-5 March in 1997,613,981 is disclosed, the inventor William J.Boyle of this patent etc. has proposed a kind of two-way two sinusoidal wave helical stent, it forms bending to first wrap that helical form extends forward and bend to second wrap that helical form is extended forward by what second filament formed a hollow with sinusoidal wave form with sinusoidal wave form of a hollow by first filament, but the hand of spiral of second wrap is opposite with first wrap, and its internal diameter is bigger than first wrap, then first wrap is placed in second wrap and both near-ends and the far-end formation that links together respectively.Above three kinds of supports blood vessel dilating diametrically all, and can not on axial length, be compensated, cause support in expansion, will shorten its length, on February 19th, 1997 disclosed European patent application EP-0758541Al, Miksza, Anthonys., a kind of support that can improve radial strength has been proposed, this support is composed of multiple units, arrange around the garden cylindrical stent in all border district, these unit, when not expanding, these unit are formed one and are contained cubical Cylinder usually, in case by after the expansion, will become " diamond " type.But the disclosed support of the document also is to give the axial length compensation.

In fact, when carrying out the blood vessel radial dilatation with the support of prior art, because support is actually a contact with intervascular the contact, as the disclosed support of CN-2195343 Y, or line contacts, and is disclosed as WO 92/09246.On the other hand, from clinically, the blood vessel narrow thrombosis that causes that becomes, even the reason of infraction mainly is because blood ester rising in the blood, the generation deposition causes on blood vessel wall, and deposit is a kind of spongiform material that is similar to, so support with radial dilatation, it is position in contact, be all can only expanding on the point or the position of line of a contact or line contact, degrees of expansion is therebetween then successively decreased to the centre from contact position, and hence one can see that its expansion effect is with influenced, especially thin, as the blood vessel of 1mm.

Therefore, the purpose of this utility model is to provide a kind of can overcome the prior art shortcoming, has the intravascular stent of axial length compensation.

Intravascular stent with axial length compensation of the present utility model comprises a plurality of circles, each circle comprises geometric figure successive broken line or curve, and on the summit of the adjacent fold line of adjacent turn or curve by realizing that the axial length compensation arrangement connects, form the footpath thus and upwards can expand, axially go up the support that is Cylinder shape that can compensate.Axial length compensation arrangement according to intravascular stent of the present utility model has broken line or sinusoidal geometric figure.Therefore, when intravascular stent of the present utility model passes through implantation device, for example in the implantation device implantable intravascular with air bag, a plurality of circles that are made of broken line or curve are after implantation device withdraws from, because itself elastic reaction returns to original-shape, thereby make directly upwards expansion of blood vessel, and meanwhile, to prolong axial elongation as the axial length compensation arrangement, that is, in case it has changed support radial dilatation in the prior art on the one hand, the defective that its length will relatively shorten, make on the other hand to form a supporting between the adjacent summit of two adjacent circles, thereby encrypted the supporting of support, reduced the defective that degrees of expansion is successively decreased between consecutive points in the prior art or the line in the middle of it blood vessel.

Endovascular stent with axial length compensation of the present utility model is to use the tubular material compatible with human-body biological to make, and particularly makes with the tubulose rustless steel.Because the size of support is less, the structure graph on it is comparatively complicated, therefore, adopts by computer-controlled laser instrument and Digit Control Machine Tool the blank part that desire is shaped is processed.Its course of processing as shown in Figure 4.To processing required all appts, comprise computer, energized such as laser instrument and Digit Control Machine Tool and finish preheating and self-check program after, at this moment instrument has been in the energy normal operation, be fixed in part blank on the Digit Control Machine Tool then and detect its by the dress whether correct, in case the blank part has been properly installed on the Digit Control Machine Tool, computer is according to the pattern form on the predetermined support, comprise the broken line on every circle or the shape of curve, for example, the broken line that comes and goes is as jaggies, or sine curve, and the structure graph of axial length compensation arrangement, transmitting order and data to Digit Control Machine Tool, Digit Control Machine Tool is by laser instrument cutter unit figure, promptly cut radial dilatation circle and compensation arrangement, carry out one-time detection behind figure of every cutting, finish, press the control signal of computer as not cutting, the automatic mobile bland position of lathe, then new unit is cut,, thereby obtain required intravascular stent until process finishing.

To be described in more detail the endovascular stent with axial length compensation of the present utility model by embodiment shown in the drawings below, so that can better understand, accompanying drawing has:

Fig. 1 is the perspective view that has the endovascular stent of axial length compensation according to of the present utility model;

Fig. 2 is the expanded view that has the endovascular stent of axial length compensation according to of the present utility model;

The change of shape of Fig. 3 A and Fig. 3 B explanation endovascular stent after not stressed and stressed;

Fig. 4 is the processing flow chart with endovascular stent of axial length compensation of the present utility model.

See figures.1.and.2, shown in the figure is perspective view and the expanded view that has the endovascular stent 10 of axial length compensation according to of the present utility model, and this support is made by stainless steel tube.Support 10 is the circles 11,12,13 by successive a plurality of broken lines of a plurality of tools or curve ... with a plurality of adjacent turns 11,12,13 that are connected ... adjacent fold line or hump 11 ', 11 ", 11 ; 12 ', 12 ", 12 ...; 13 ', 13 ", 13 ... axial length compensation arrangement 21 ', 21 ", 21 , 22 ', 22 ", 22 ...; 23 ', 23 ", 23 ... form, as we can see from the figure, the circle termination that support 10 two ends all link to each other with broken line or curve.

The circle 11,12,13 that described a plurality of broken line or curve link to each other ..., wherein said broken line or curve can be the limits by two waists of successive a plurality of isosceles triangles, also can be sine curves.And the adjacent fold line of connection adjacent turn or the axial length compensation arrangement of hump can be sine curves, but are not limited thereto, and it also can have zigzag, trapezoid linear structure.

The effect of axial length compensation arrangement is described below with reference to Fig. 3 A and Fig. 3 B.Be at expansion state not shown in Fig. 3 A, promptly adjacent turn 11 and two broken line patterns 11 of 12 ', 11 "; and 12 '; 12 " by nose balance device 21 ' with 22 ' be connected, wherein broken line pattern 11 ' and 11 " between angle be α, the distance between two adjacent turns is L.When support is subjected to radial dilatation shown in Fig. 3 B, adjacent fold line pattern 11 ' and 12 ' angle increase to α ₁Broken line figure 11 ' and 12 ' in the horizontal direction projection will be than the weak point shown in Fig. 3 A in other words, but, in the support radial dilatation, constitute nose balance device 21 ' and 22 ' broken line or curve by stretching partially, thereby remedied because the shortening of the caused axial length of radial dilatation.In addition, support of the present utility model also has good flexibility, and therefore, it is easy to import branch vessel.

According to an embodiment of the present utility model, the external diameter of support is 2.2mm, and internal diameter is 2.0mm, and wall thickness is 0.1mm, and long is 17-27mm.

Claims

1, a kind of endovascular stent with axial length compensation, it is characterized in that it is by a plurality of circles, each circle comprises the geometric figure that successive broken line or curve constitute, form with the axial length compensation arrangement of adjacent fold line that is connected adjacent turn or hump, wherein said axial length compensation arrangement is broken line or curvilinear figure, and described support two ends are respectively circles.

2, according to the described endovascular stent with axial length compensation of claim 1, the figure that wherein said successive broken line or curve constitute is the isosceles limit of isosceles triangle.

3, according to the described endovascular stent with axial length compensation of claim 1, the figure that wherein said successive broken line or curve constitute is a sine curve.

4, according to the described endovascular stent with axial length compensation of claim 1, the broken line or the curvilinear figure that wherein constitute the axial length compensation arrangement are zigzag or sine curve or trapezoidal.

5, according to the described endovascular stent with axial length compensation of claim 1-4, wherein said support is by making with the human-body biological compatible material.

6, according to the described endovascular stent of claim 5 with axial length compensation, wherein said by with the human-body biological compatible material be rustless steel.