CN1140227C

CN1140227C - Articulated stent

Info

Publication number: CN1140227C
Application number: CNB951979000A
Authority: CN
Inventors: G・品茶思客; G·品茶思客; 仗囟; J·里赫特尔
Original assignee: MEINOL Ltd
Current assignee: MEINOL Ltd
Priority date: 1995-04-26
Filing date: 1995-04-26
Publication date: 2004-03-03
Anticipated expiration: 2015-04-26
Also published as: CN1186423A

Abstract

The present invention relates to a connecting section (110) for connecting adjacent sections (102) and adjacent regions of a universal dilator, which comprises a group of flexible connecting members (112), wherein each flexible connecting member comprises a group of parts. A bending region is arranged between each pair of adjacent parts, wherein the bending region of each flexible connecting member is still bent during the period of the expansion of the universal dilator.

Description

The linkage section of articulated stent and the adjacent segment that is used to be connected this articulated stent

Technical field

The present invention relates to dilator, as this dilator of a part of vasodilation plasty can implanted work the body interior conduit of animal or human's body in, unimpeded to keep it.The linkage section that The present invention be more particularly directed to endovascular articulated stent and be used to connect the adjacent roughly rigidity sections of this articulated stent has in the blood vessel of sweep in order to send into or to implant one.

Background technology

In the prior art, this dilator is known, and this dilator has a contracted diameter so that send into a blood vessel and an expansion diameter, supports blood vessel so that apply a radially outer expansionary force.Articulated stent also is known in a curved blood vessel or the implantation blood vessel wherein in order to send in the prior art.

For example, the name of authorizing Wolff is called in the United States Patent (USP) 5,104,404 of " articulated stent " and has described self distensible articulated stent.Johnson ﹠amp; The distensible articulated stent of capsule formula is sold with the trade mark of Palmaz-Schatz Balloon-Expandable Stents by Johnson InterventionSystems company on market.

Now, describe self expansible articulated stent 10 of the prior art be used in the curved blood vessel 16 with reference to Fig. 1, in fact Fig. 1 is exactly Fig. 2 of above-mentioned United States Patent (USP) 5,104,404.Dilator 10 is made of one group of independent sections 12, and sections 12 is flexibly connected by the folding 14 that each end is connected in sections 12.Preferably by the shape-memory material manufacturing of nitinol and so on, because using the United States Patent (USP) 4,830 of authorizing Wolff, but this material was self expansion to dilator 10 after 003 described induction system was sent into.Yet as described below, articulated stent has many defectives during sending into crooked blood vessel and when implanting in it in the blood vessel of these prior aries.

Dilator 10 is sent into crooked blood vessel 16 than sending into the many of non-articulated stent complexity, because dilator 10 is located so that its folding 14 is located towards the bossing of blood vessel 16 on angle, dilator 10 can curve inwardly like this.In this example, can notice that folding 14 is positioned at the same side of sections 12, this is because blood vessel 16 in one plane only has a simple bending.Can imagine easily and dilator be sent into the blood vessel that one or more sweeps are arranged in a plane is more not complicated, and need specially designed dilator usually.

Even in the time of within implanting a curved blood vessel 16, shown in the problem of dilator 10 to be that gap between the sections 12 makes that the sweep of blood vessel 16 does not have supported.And, obviously greater than in the gap of recess office, therefore on blood vessel 16, produce inhomogeneous thereby unfavorable stress in the gap of blood vessel 16 lobe offices.

So, very need a kind of articulated stent at present, when this dilator being sent into the body interior conduit of a bending, do not need to carry out any special angle orientation, and straight line and the sweep to the body interior conduit can both provide continuous and supporting uniformly when implanting.

And, wish very that also the structure of dilator does not depend on vascular bending special shape partly.

Summary of the invention

The purpose of this invention is to provide a kind of articulated stent, adopt common medical procedure and traditional dilator induction system just this dilator can be sent into the body interior conduit of a bending.And dilator can both provide continuous and supporting uniformly to the straight line and the sweep of body interior conduit when implanting.In addition, the structure of dilator and the supporting of body interior conduit is not depended on the shape of pipe bending part.

Another object of the present invention is to provide a kind of be used to connect articulated stent adjacent, be roughly tubulose and roughly be the linkage section of inflexible sections.

Be a kind of articulated stent according to above-mentioned purpose of the present invention in the technical scheme aspect the articulated stent with longitudinal axis, comprise: (a) a plurality of tubulose and inflexible sections of being roughly, described sections defines a vertical hole, (b) flexible connecting member of the described rigidity sections of a plurality of connections, each described flexible connecting member comprises at least one first one second portion and a third part, from laterally seeing each connector the bending area that places between the described part is arranged.

Above-mentioned purpose the technical scheme of the linkage section direction of the adjacent segment that is used to connect this articulated stent be a kind of be used to connect articulated stent adjacent, be roughly tubulose and roughly be the linkage section of inflexible sections, this linkage section comprises: a plurality of flexible connecting members, described flexible connecting member comprises at least one first, a second portion and a third part, has first bending area between described first and second portion from laterally seeing described connector; Second bending area between described second portion and third part.

After expansion, the rigidity sections of dilator preferably is the shape of a diamond fine-structure mesh, has the 1mm long side, provides continuously and supporting uniformly with the straight line portion to the body interior conduit.

Linkage section can be made of one group of roughly spiral connector that connects adjacent segment.Select as another kind, connector can be made of the connector that has at least one bending.Generally, connector has 8 to 24 connectors, so that all provide continuous and supporting uniformly to the straight line and the sweep of body interior conduit.

Dilator has the diameter of contraction so that carry in tube chamber, by means of the expansion of the tympanites device of a part that forms the conduit induction system, dilator is deformed into expansion diameter, so that radially outward apply expansionary force, the chamber of supporting mass interior conduit then.Generally speaking, the contraction of dilator and expansion diameter are respectively in the scope of 1.0-3.5mm and 3.5-10.0mm.

Dilator preferably by low memory, have more plasticity and stiff biocompatible material is made, rustless steel 316L for example, gold, tantalum etc., these materials make the dilator can be from its contracted diameter plastic deformation to its expansion diameter.

Implanting the IC typical dilator of a human body has 9-21mm long, the long dilator sections of three to seven 2.2mm that is coupled together by the long linkage section of two to six 1mm constitutes, like this when bending under the situation of about 9mm bending radius the end of dilator face toward 45 ° to 135 ° angle.

Description of drawings

Below, with reference to accompanying drawing the present invention is only described by way of example, in the accompanying drawing:

Fig. 1 is a view that amplifies, and shows the prior art articulated stent that is used in the curved blood vessel;

Fig. 2 a and 2b show the known articulated stent close with the present invention, are in the preceding lax and crooked state of plastic deformation respectively;

Fig. 2 c shows the dilator of having expanded shown in Figure 2 after the plastic deformation;

Fig. 2 d shows with case of bending and is installed in dilator shown in Figure 2 in the conduit;

Fig. 2 e and Fig. 2 f show and are expanded dilator shown in Figure 2 afterwards before the expansion and by means of the tympanites device as the part of conduit induction system;

Fig. 3 a and 3b show the embodiment according to the articulated stent of instruction formation of the present invention and operation, are in plastic deformation preceding relaxed state and case of bending respectively; With

Fig. 3 c shows the dilator of expansion shown in Figure 3 after the plastic deformation.

The specific embodiment

The present invention relates to a kind of articulated stent, in order to sending into the body interior conduit of a bending, the animal or human's who for example lives periphery or coronary artery, and implant in it to keep unimpeded as the part of vasodilation plasty.

With reference to accompanying drawing and description thereof, can understand the principle and the operation of articulated stent of the present invention better.

Referring now to accompanying drawing, Fig. 2 a-2c shows the known articulated stent close with the present invention, totally represents with 100, and it generally includes one group of roughly inflexible sections 102 that is connected by linkage section 110.

Preferably sections 102 is manufactured the form that is a diamond fine-structure mesh, be made of interconnective diamond mesh 108, the side of mesh 108 is 1mm when expansion, as shown in Figure 2.Sections 102 generally includes 8 to 24 diamond meshes 108, depends on the expection diameter of dilator 100.

Linkage section 110 comprises the connector 112 that a front end 104 is connected in adjacent segment 102 tail ends 106.Between the summit of the diamond mesh 108 at the front end 104 of

adjacent segment

102 and 106 places, rear end, connector 112 preferably extends with spiral way roughly, and the quantity of connector 112 just equals the quantity of mesh 108 like this.Preferably the circumference around sections 102 is provided with connector 112 equably, so just can be along the bending of any direction equivalent, and to the straight line portion of body interior conduit with sweep can both provide continuously and supporting uniformly.Lay respectively at the front end 104 of a sections 102 and the adjacent linkage section 110 on the rear end 106, their connector 112 is preferably respectively along twining clockwise and counterclockwise.The linkage section 110 that alternation twines guarantees connectors 112 and adjacent segment 102 with respect to the blood vessel wall rotation displacement, the more important thing is that when dilator 100 is expanded the tympanites with its induction system reduces to minimum degree.

Linkage section 110 is the shape of substantial cylindrical when dilator 100 relaxes, and shown in Fig. 2 a, and is the shape that stretches to some extent and compress when dilator 100 bendings, shown in Fig. 2 b.Connector 112 biphase reciprocal to displacement brought up curved shape.At first, the stretching, extension in various degree of linkage section 110 occurs in the lobe offices of 114 expressions and connector 112 mutually from far.The second, the compression in various degree of linkage section 110 occurs in 116 expression recess offices and connector 112 shifts near mutually.

Shown in Fig. 2 a and 2b, dilator 100 has a diameter that shrinks so that send into the body interior conduit of a bending, and as Fig. 2 c be shown with a diameter of expanding so that the supporting mass interior conduit.Dilator 100 is preferably by low memory and have more plasticity and stiff biocompatible material manufacturing, rustless steel 316L for example, and gold, tantalum etc., this can plastically be out of shape by the diameter from the diameter of its contraction to its expansion it.The contraction of dilator and expansion diameter are respectively in the scope of 1.0-3.5mm and 3.5-10.0mm.

To 2f, a shown dilator 100 and a tympanites device 118 are overlapping referring now to Fig. 2 d, and tympanites device 118 forms the part of its conduit induction system 120.Dilator 100 is installed on its conduit induction system with the state that diameter shrinks shown in Fig. 2 e, so that arrive its expansion diameter by means of the expansion plastic deformation of tympanites device 118, and shown in Fig. 2 f, thus the wall of supporting mass interior conduit.The IC dilator of one routine implant into body has 15mm length, and the long sections 102 of five 2.2mm that is connected by the long linkage section of four 1mm constitutes, and can be so crooked, and promptly its end faces toward one 90 ° angle under the condition of about 9mm bending radius.

Because dilator 100 can be crooked equally along any direction, and do not need to carry out specially angle orientation to pass through a specific sweep, so carry articulated stent 100 simply more than the dilator of carrying prior art.Carrying this advantage particular importance by blood vessel with a plurality of sweeps.Compare with the dilator 10 of prior art, another advantage of dilator 100 is: by means of the straight line portion of sections 102 and unbent linkage section 110 supporting blood vessels, and

linkage section part

114 and 116 supports the projection and the recessed portion of blood vessel respectively, and dilator 100 just can provide one to support continuously and uniformly along the whole length of blood vessel.

Referring now to Fig. 3 a and 3b, they show articulated stent 122 of the present invention, and its middle connecting segment 124 is made of the connector 126 that has one or more bendings 128.The design of linkage section 124 is better than the design of linkage section 110, and this is because owing to two reason dilators 100 have a kind of trend of damaging tympanites device 118.The first, when dilator 100 bendings, the connector 112 that is stacked on tympanites device 118 bossings has a trend to bias internal.The second, when dilator 200 expansion, sections 102 is with respect to tympanites device 118 displacement that rotates.Like this, when described dilator was expanded by described tympanites device, described sections did not roughly have rotation displacement with respect to the tympanites device that places vertical hole.

In this case, as in the previous connector 112 biphase reciprocal to displacement brought up the stretching, extension in various degree of linkage section 124 and the curved shape of compression, difference is that linkage section 124 stretching, extension in various degree occurs in bossing 114 places, bending 128 is stretched slightly, linkage section 124 compression in various degree simultaneously occurs in recessed portion 116 places, and bending 128 is more crooked.

Similar with the mode of dilator 100, dilator 122 has a diameter that shrinks, so that send into the body interior conduit of a bending, shown in Fig. 3 a and 3b, and has a diameter of expanding, and supporting mass interior conduit when implanting pipeline with box lunch is shown in Fig. 3 c.

Although described the present invention in conjunction with a limited number of several embodiment, should know and can do many changes the present invention, improve, and apply the present invention to other occasion.

Claims

1. one kind is used to connect articulated stent linkage section adjacent, tubulose and inflexible sections, and this linkage section comprises:

A plurality of flexible connecting members, described flexible connecting member comprise at least one first, a second portion and a third part, have from laterally seeing described connector

First bending area between described first and second portion;

Second bending area between described second portion and third part.

2. linkage section as claimed in claim 1 is characterized in that described first bending area and second bending area are still crooked after described dilator expansion.

3. linkage section as claimed in claim 1 is characterized in that described first bending area and second bending area enlarge between expander in expanding stage.

4. linkage section as claimed in claim 1 is characterized in that described part is straight.

5. linkage section as claimed in claim 1 is characterized in that described bending area is relative.

6. linkage section as claimed in claim 5, wherein said bending area enlarges between described expander in expanding stage.

7. articulated stent with longitudinal axis comprises:

(a) a plurality of tubuloses and inflexible sections, described sections define a vertical hole and

(b) flexible connecting member of the described rigidity sections of a plurality of connections, each described flexible connecting member comprises at least one first one second portion and a third part, from laterally seeing each connector the bending area that places between the described part is arranged.

8. dilator as claimed in claim 7 is characterized in that each described flexible connecting member all extends between two of described a plurality of sections, and connects between described a plurality of sections two.

9. dilator as claimed in claim 8 is characterized in that described a plurality of flexible connecting member has end points, states connector in the end points place and links to each other with described sections.

10. dilator as claimed in claim 9 is characterized in that the end points of described flexible connecting member vertically aims at the hole of described longitudinal extension.

11., it is characterized in that described flexible connecting member is suitable for compensating the preshrunk of described sections when described dilator expansion as described dilator one of in the claim 7～10.

12., it is characterized in that described dilator expands by the expansion of tympanites device as described dilator one of in the claim 7～10.

13., it is characterized in that the described section of flexibly connecting, and the described abutting end length travel away from each other that is connected the rigidity sections of compensation when described dilator expansion towards the longitudinal length opening as described dilator one of in the claim 7～10.

14., it is characterized in that described sections can not relatively rotate with respect to each other when described dilator expansion as described dilator one of in the claim 7～10.

15., it is characterized in that described connector when described dilator expansion, the vertical hole that can not stretch into or stretch out described dilator as described dilator one of in the claim 7～10.

16., it is characterized in that described connector when described dilator is crooked, the vertical hole that can not stretch into or stretch out described dilator as described dilator one of in the claim 7～10.

17., it is characterized in that at described dilator described sections does not have rotation displacement with respect to the tympanites device that places vertical hole during by described tympanites device expansion as described dilator one of in the claim 7～10.

18. dilator as claimed in claim 17 is characterized in that comprising:

Wherein each described connector all extends between two of described a plurality of sections, and connect between described a plurality of sections two, wherein said a plurality of flexible connecting member has end points, state connector links to each other with described sections in the end points place, the end points of wherein said flexible connecting member is vertically aimed at the hole of described longitudinal extension, wherein said flexible connecting member is suitable for compensating the preshrunk of described dilator when described dilator is expanded, wherein said dilator is expanded by the expansion of tympanites device.

19. dilator as claimed in claim 7, it is characterized in that described dilator expands by the expansion of tympanites device, wherein said flexible connecting member can not stretch into or stretch out described dilator when the expansion of described dilator vertical hole, and the wherein said flexible connecting member vertical hole that when described dilator is crooked, can not stretch into or stretch out described dilator.