CN1186423A

CN1186423A - Articulated stent

Info

Publication number: CN1186423A
Application number: CN95197900A
Authority: CN
Inventors: G·品茶思客; 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: 1998-07-01
Anticipated expiration: 2015-04-26
Also published as: CN1140227C

Abstract

A connector for connecting adjacent areas of segments of an articulated stent, includes flexible links, wherein each of the links includes a plurality of portions with each pair of neighboring portions having an area of infection therebetween and wherein daring expansion of saidstent, said area of inflection of each link remains inflected.

Description

Articulated stent

Background of invention and 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 present invention be more particularly directed to endovascular articulated stent, have in the blood vessel of sweep in order to send into or to implant one.

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.

The objective of the invention is to reach by a kind of like this articulated stent, this dilator comprises: (a) at least two roughly inflexible sections; (b) one in order to connect the section of flexibly connecting of adjacent segment, and wherein linkage section is the shape of substantial cylindrical when relaxing, when bending, be in various degree stretching, extension and the curved shape of compression.

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.

Brief description of the 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 according to instruction of the present invention and constitute and a most preferred embodiment of the articulated stent of operation, are in lax and crooked state before the 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 second 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 description of most preferred 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 an articulated stent that constitutes and work according to instruction of the present invention, represents with 100 usually, 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.

Feature of the present invention is the shape that linkage section 110 is 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 of the present invention 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 of the present invention 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 an articulated stent 122, 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.

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. linkage section in order to the adjacent area that connects the articulated stent adjacent segment, this linkage section comprises:

One group of flexible connecting member,

Wherein each described flexible connecting member comprises one group of part, and every pair of adjacent part has the zone of a bending between them.

2. linkage section according to claim 1, wherein the bending area of each described flexible connecting member is still crooked between described expander in expanding stage.

3. articulated stent comprises:

(a) at least two roughly inflexible sections, described sections has one group of mesh with summit that couples together, and wherein when expansion, each described rigidity sections is the form of roughly cylindric diamond net; With

(b) section of flexibly connecting comprises one group of flexible connecting member

Wherein each described flexible connecting member connects the summit of the adjacent mesh on the adjacent rigid sections;

Each described flexible connecting member comprises one group of part, and every pair of adjacent part has the zone of a bending between them, and described bending area is still crooked between described expander in expanding stage.

4. dilator as claimed in claim 3, wherein said one group of connector comprises 8 to 24 connectors.

5. dilator as claimed in claim 3, make by the biocompatible material of inelastic deformation by more trending towards plastic deformation for wherein said dilator.

6. dilator as claimed in claim 5, wherein said material is a rustless steel.

7. dilator as claimed in claim 5, wherein said material are gold.

8. dilator as claimed in claim 5, wherein said material is a tantalum.