阅读说明：本技术 分叉支架 (Bifurcated stent ) 是由 董智慧 符伟国 刘浩 李安伟 任博翰 王永胜 于 2020-04-02 设计创作，主要内容包括：本申请公开一种分叉支架,包括主体、第一分支及第二分支,所述第一分支与所述第二分支均连接至所述主体的同一端,所述主体、所述第一分支及所述第二分支均为网状结构,所述分叉支架还包括连接于所述第一分支与所述第二分支之间的分叉区域,所述分叉支架在所述分叉区域的网格密度大于所述分叉支架其他区域的网格密度。如此,增加分叉支架的分叉区域与分叉位置处的血管壁的接触面积,分叉区域能够支撑分叉位置处的血管壁,并且,由于分叉区域的网格密度大于分叉支架其他区域的网格密度,防止分叉位置处附壁血栓脱落所导致的栓塞。(The application discloses branching support, including main part, first branch and second branch, first branch with the second branch all is connected to the same one end of main part, the main part first branch reaches the second branch is network structure, branching support still including connect in first branch with branching region between the second branch, branching support is in branching region's grid density is greater than the grid density in other regions of branching support. In this way, the contact area between the bifurcation area of the bifurcation stent and the blood vessel wall at the bifurcation position is increased, the bifurcation area can support the blood vessel wall at the bifurcation position, and the grid density of the bifurcation area is higher than that of other areas of the bifurcation stent, so that embolism caused by the falling of mural thrombus at the bifurcation position is prevented.)

1. The utility model provides a bifurcation stent, its characterized in that includes main part, first branch and second branch, first branch all is connected to with the second branch same one end of main part, the main part, first branch and the second branch are network structure, bifurcation stent still including connect in first branch with the bifurcation region between the second branch, bifurcation stent is in the grid density in bifurcation region is greater than the grid density in other regions of bifurcation stent.

2. The bifurcated stent of claim 1,

The bifurcation region extends from the junction of the first branch and the second branch, on the first branch near the side of the second branch, toward the distal end of the first branch; and/or

The bifurcation region extends from the junction of the first branch and the second branch, on the second branch near the side of the first branch, to the distal end of the second branch; and/or

The bifurcation region extends from a junction of the first branch and the second branch to the main body.

3. The bifurcated stent of claim 2, wherein the first leg and/or the second leg includes a connecting portion disposed at a proximal end, at least a portion of the connecting portion being funnel-shaped and connecting to the distal end of the main body, the bifurcation region being disposed at least partially over the connecting portion.

4. The bifurcated stent of any one of claims 1-3, wherein the lattice structure of the first leg in the bifurcated region is intertwined with the lattice structure of the second leg in the bifurcated region such that the lattice density of the bifurcated stent in the bifurcated region is greater than the lattice density of other regions of the bifurcated stent.

5. The bifurcated stent of any one of claims 1-3, further comprising a connector disposed in the bifurcated region, the connector being connected between the mesh structures of the first and second branches such that the lattice density of the bifurcated stent is greater in the bifurcated region than in other regions of the bifurcated stent.

6. The bifurcated stent of claim 5,

The connecting pieces are of a net structure, and the grid density of the connecting pieces is greater than that of other areas of the bifurcation stent; alternatively, the first and second electrodes may be,

The connecting piece comprises at least one winding wire, and each winding wire is used for connecting the net structures of the first branch and the second branch, the net structure of the first branch and one winding wire, the net structure of the second branch and one winding wire or two winding wires.

7. The bifurcated stent of any one of claims 1-3, further comprising a first cover covering the bifurcation region, the first cover having a lattice density greater than the lattice density of other regions of the bifurcated stent.

8. The bifurcated stent of claim 7, further comprising a second cover disposed over said bifurcated region, said first cover having a lattice density greater than a lattice density of said second cover.

9. The bifurcated stent of any one of claims 1-3, wherein the lattice structures of the main body, the first leg and the second leg each include at least one support ring arranged along a respective axis, the support rings being corrugated and defining peaks and valleys, the peaks of the support rings of the first leg and/or the second leg being connected to the valleys of the support rings of the main body.

10. The bifurcated stent of claim 9, wherein the body, the first leg, and the second leg each define a cavity, and the cavities of the first leg and the second leg communicate with the cavity of the body, the first leg, and the second leg being inboard toward a side of the respective cavity, and the body, the first leg, and the second leg being outboard away from a side of the respective cavity;

At the junction of the body with the first and second limbs, the peaks of the support ring of the first and/or second limb pass from the inside to the outside through the troughs of the support ring of the body, or from the outside to the inside through the troughs of the support ring of the body; and/or

Between adjacent support rings of the body, the wave crest of the support ring at the distal end passes through the wave trough of the support ring at the proximal end from the inner side to the outer side, or passes through the wave trough of the support ring at the proximal end from the outer side to the inner side; and/or

Between adjacent support rings of the first and/or second limbs, the wave crests of the distal support ring pass from the inside to the outside through the wave troughs of the proximal support ring, or from the outside to the inside through the wave troughs of the proximal support ring.

11. The bifurcated stent of claim 10, wherein each of said support rings includes at least one sub-support ring, said sub-support ring including a plurality of wave bars connected in series, two of said wave bars forming a peak at a proximal junction and two of said wave bars forming a valley at a distal junction.

12. The bifurcated stent of claim 11, wherein at least one of the support rings in the bifurcated stent includes a first sub-support ring and a second sub-support ring, the first sub-support ring and the second sub-support ring being radially stacked one on top of the other about an axial direction of the main body, the first leg, or the second leg.

13. The bifurcated stent of claim 11, wherein at least one of said support rings in said bifurcated stent includes a first sub-support ring and another sub-support ring, said first sub-support ring and said another sub-support ring being radially and alternately disposed around an axial direction of said main body, said first branch or said second branch, said wave bars of said first sub-support ring forming a plurality of intersections with the wave bars of said another sub-support ring, wherein there are at least adjacent first intersections at which the wave bars of said first sub-support ring are disposed outside with respect to the wave bars of said another sub-support ring intersecting therewith, and second intersections at which the wave bars of said first sub-support ring are disposed inside with respect to the wave bars of said another sub-support ring intersecting therewith.

Technical Field

The present application relates to implantable devices for use within a patient, and more particularly to a bifurcated stent.

Background

With the improvement of living standard and the change of life style of people, the incidence rate of vascular diseases is higher and higher, and if the diseases are not treated in time, the diseases such as vascular blockage, aneurysm and the like can be caused, and the life safety of human beings can be seriously harmed.

At present, the vascular diseases can be treated by adopting minimally invasive intervention, and the method has small wound on patients, high safety and high effectiveness, so the method is determined by operators and patients and becomes an important treatment method for the vascular diseases. The interventional therapy method is characterized in that a stent is implanted into a diseased blood vessel section of a patient by using a conveying system, the implanted stent can support a blood vessel of a stenotic occlusion section or block a laceration of a blood vessel interlayer by expansion, the elastic retraction and the reshaping of the blood vessel are reduced, the blood flow of a lumen is kept smooth, and the effect of preventing restenosis is achieved.

The existing stents for repairing main iliac artery occlusive lesions (including stenotic lesions) are mostly in a conventional straight tube type or an integrated bifurcation type. When the conventional straight-tube type treatment is carried out, more than one stent (such as a covered stent or a bare stent) is required to be placed in parallel or in a crossed manner, and the stent is implanted in such a way, so that the guide wire cannot cross the bifurcation of the main iliac artery from the femoral artery and then enter the blood vessel of the contralateral limb by adopting a 'mountain-turning technology', and further the treatment of the blood vessel of the contralateral limb cannot be carried out. In addition, after some existing bifurcated stents are implanted at the bifurcation position of the abdominal aorta and the iliac artery, because the meshes of the bifurcated stents at the bifurcation region are sparse, the mural thrombus at the bifurcation position of the abdominal aorta is easy to fall off at the bifurcation region of the stent and enter the circulatory system along with blood.

Disclosure of Invention

In order to solve the aforementioned problems, the present application provides a bifurcated stent.

The application provides a bifurcation support, including main part, first branch and second branch, first branch with the second branch all is connected to the same one end of main part, the main part first branch reaches the second branch is network structure, bifurcation support still including connect in first branch with bifurcation region between the second branch, bifurcation support is in the grid density in bifurcation region is greater than the grid density in other regions of bifurcation support.

After the bifurcation stent provided by the application is implanted into the bifurcation position of the abdominal aorta and the iliac arteries, the main body is contained in the abdominal aorta, the first branch and the second branch are respectively contained in one iliac artery, and the bifurcation area is spanned between the two iliac arteries. The utility model provides an increase the grid density of its bifurcation region in the bifurcation support, improved the area of contact of bifurcation region and iliac artery bifurcation position department vascular wall on the one hand, reduced the risk that the adnexed wall thrombus of abdominal aorta bifurcation position department drops back and gets into circulation system along with blood, on the other hand is favorable to increasing the holding power of bifurcation region to blood vessel bifurcation position vascular wall, reduces the oppression of two branches of bifurcation support to two iliac arteries. In addition, the bifurcation stent provided by the application allows a guide wire to cross the bifurcation of the main iliac artery from the femoral artery by adopting a 'mountain-turning technology' and then enter the contralateral iliac artery, so that an operator can conveniently treat the contralateral limb blood vessel.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of a bifurcated stent provided in a first embodiment of the present application.

Fig. 2 is a schematic view of an application scenario of the bifurcated stent provided in fig. 1.

FIG. 3 is a schematic view of the bifurcation stent shown in FIG. 1, woven in a manner similar to that described above.

FIG. 4 is a partial schematic view of a support ring of the bifurcated stent of FIG. 3.

Fig. 5 is a partial schematic view of a support ring in a modified embodiment of the bifurcated stent shown in fig. 3.

FIG. 6 is an enlarged partial schematic view of the bifurcated stent of FIG. 3.

FIG. 7 is a further enlarged partial schematic view of the bifurcated stent of FIG. 3.

Figure 8 is a perspective view of the bifurcated stent shown in figure 1.

FIG. 9 is an enlarged partial schematic view of the bifurcated stent of FIG. 1.

FIG. 10 is a bottom view of the bifurcated stent of FIG. 8.

FIG. 11 is a bottom view of a bifurcated region of a conventional bifurcated stent shown in the clear.

Fig. 12 is a schematic structural view of a bifurcated stent provided in a second embodiment of the present application.

FIG. 13 is a bottom view of the bifurcated stent of FIG. 12.

Fig. 14 is a bottom view of a bifurcated stent according to a third embodiment of the present disclosure.

FIG. 15 is an enlarged partial schematic view of the bifurcated stent of FIG. 14.

Fig. 16 is a schematic structural view of a bifurcated stent provided in a fourth embodiment of the present application.

FIG. 17 is a bottom view of the bifurcated stent of FIG. 16.

Fig. 18 is a schematic structural view of a bifurcated stent provided in a fifth embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

In this application the term "proximal" refers to the end closer to the heart in the direction of blood flow, and "distal" refers to the end further away from the heart in the direction of blood flow; the direction of the central axis of rotation of an object such as a cylinder or a pipe is defined as the axial direction.

First embodiment

Referring to fig. 1, fig. 1 is a schematic structural diagram of a bifurcated stent according to a first embodiment of the present application.

The present application discloses a bifurcated stent 100, which comprises a main body 10, a first branch 30 and a second branch 50, wherein the first branch 30 and the second branch 50 are both connected to the same end of the main body 10, the first branch 30 and the second branch 50 are all of a net structure, the bifurcated stent 100 further comprises a bifurcated region 70 connected between the first branch 30 and the second branch 50, for the convenience of understanding, the bifurcated region 70 is represented by parallel oblique lines which are more dense relative to other regions in fig. 1, but the oblique lines are only used for representing the position of the region and are not used for limiting the specific structural form in the bifurcated region 70, such as the weaving mode of the braided wires in the bifurcated region 70, and the like. In the present application, the lattice density of the bifurcated stent 100 in the bifurcation region 70 is greater than the lattice density of the other regions of the bifurcated stent 100. Other regions of the bifurcated stent 100, the remaining regions of the bifurcated region 70 are removed for the bifurcated stent 100.

Referring to fig. 1 and 2, after the bifurcation stent 100 provided by the present application is implanted into the abdominal aorta and the iliac arteries, the main body 10 is accommodated in the abdominal aorta, the first branch 30 and the second branch 50 are respectively accommodated in one iliac artery, and the bifurcation region 70 spans between the two iliac arteries. The application provides a bifurcated stent 100 because the grid density at bifurcation region 70 is greater than the grid density of other regions of bifurcated stent 100, has improved the area of contact of bifurcation region 70 and iliac artery bifurcation position department vascular wall on the one hand, has reduced the risk that the adnexal wall thrombus of abdominal aorta bifurcation position department drops back gets into circulation system along with blood, and on the other hand is favorable to increasing the holding power of bifurcation region 70 to blood vessel bifurcation position vascular wall, reduces the oppression of bifurcated stent 100's two branches (being first branch 30 and second branch 50) to two iliac arteries. In addition, the bifurcated stent 100 provided by the present application allows a guidewire to be advanced from the femoral artery into the contralateral iliac artery after crossing the abdominal aorta bifurcation using a "mountain-climbing technique" to facilitate treatment of the contralateral limb vessel by the operator. It is understood that the above application scenarios are merely exemplary and not limiting, and the bifurcation stent 100 provided by the present embodiment can also be used for implantation at any Y-shaped bifurcation formed by a main vessel and a branch vessel. When implanted, the bifurcation area 70 spans between the two branches, the first branch 30 and the second branch 50 are received in the two branches, respectively, and the main body 10 is received in the main vessel.

In the present embodiment, the length of the first branch 30 in the axial direction thereof is larger than the length of the second branch 50 in the axial direction thereof. The length of the second branch 50 along the axial direction is sufficient to facilitate the guide wire to cross the bifurcation position by adopting a 'mountain-turning technology' and then enter the opposite iliac artery. It is to be understood that the length of the first branch 30 in the axial direction thereof is not limited to be greater than the length of the second branch 50 in the axial direction thereof, and for example, the length of the first branch 30 in the axial direction thereof may be equal to or less than the length of the second branch 50 in the axial direction thereof.

In this embodiment, the crotch region 70 extends from the junction of the first branch 30 and the second branch 50, on the first branch 30 on the side closer to the second branch 50, toward the distal end of the first branch 30; and, a crotch region 70 extends from the junction of the first branch 30 and the second branch 50, on the second branch 50, adjacent the first branch 30 side, to the distal end of the second branch 50. The distal end of the first branch 30 is the end of the first branch 30 away from the main body 10; the distal end of the second branch 50 is the end of the second branch 50 away from the main body 10. In one embodiment, the crotch region 70 extends from the junction of the first branch 30 and the second branch 50, on the side of the first branch 30 adjacent the second branch 50, to a position proximal to the distal end of the first branch 30, or to the distal end of the first branch 30. In one embodiment, the crotch region 70 extends from the junction of the first branch 30 and the second branch 50, on the side of the second branch 50 adjacent the first branch 30, to a location proximal to the distal end of the second branch 30, or to the distal end of the second branch 50.

It is to be understood that, in the modified embodiment, the shape of the branch region 70 is not limited, and for example, the branch region 70 is a linear region connected between the first branch 30 and the second branch 50, or the branch region 70 is a strip region connected between the first branch 30 and the second branch 50. It will be appreciated that without limiting the extent of the crotch region 70, the crotch region 70 extends distally of the first branch 30 from the junction of the first branch 30 and the second branch 50, on the side of the first branch 30 adjacent the second branch 50; and/or a crotch region 70 extending from the junction of the first branch 30 and the second branch 50, on the side of the second branch 50 adjacent the first branch 30, to the distal end of the second branch 50; and/or the bifurcation area 70 extends from the junction of the first leg 30 and the second leg 50 to the main body 10, are within the scope of the present application.

In the present embodiment, the main body 10, the first branch 30 and the second branch 50 each enclose a cavity, the cavities of the first branch 30 and the second branch 50 are all communicated with the cavity of the main body 10, one side of the main body 10, the first branch 30 and the second branch 50 facing the respective cavities is an inner side, and one side of the main body 10, the first branch 30 and the second branch 50 facing away from the respective cavities is an outer side.

In the present embodiment, the main body 10, the first branch 30, and the second branch 50 are all cylindrical. It is understood that the main body 10, the first branch 30 and the second branch 50 are not limited to be cylindrical, and the main body 10, the first branch 30 and the second branch 50 can be made to fit the inner wall of the blood vessel as much as possible.

Referring to fig. 1 and 3, the main body 10, the first branch 30 and the second branch 50 each include at least one support ring 61 arranged along the respective axial direction. The support ring 61 is a flexible metal support frame or a flexible non-metal support frame made of a polymer material, and in the present embodiment, the support frame 255 is a nickel alloy support frame. The support ring 61 includes at least one sub-support ring, which is corrugated, and when the number of the sub-support rings is plural, the plural sub-support rings are radially stacked or alternately interleaved around the central axis of the main body 10, the first branch 30, or the second branch 50. The sub-support ring comprises a plurality of wave bars 612 connected in series, two wave bars 612 forming wave crests 614 at the proximal connection and two wave bars 612 forming wave troughs 615 at the distal connection.

A mesh structure weave is now provided, as follows:

As shown in fig. 3, fig. 3 shows a schematic view of the mesh structure of the first embodiment of the present application being expanded along a generatrix, in order to distinguish different support rings 61, 3 adjacent support rings in fig. 3 are respectively represented as support rings 61A, 61B and 61C, and the support rings 61A, 61B and 61C are sequentially arranged from the proximal end to the distal end, and the support rings 61A, 61B and 61C are located in the main body 10, the first branch 30 or the second branch 50. The bus bar is a line parallel to the respective axial direction on the side surface of the respective net structures of the main body 10, the first branch 30 or the second branch 50. The support rings 61A, 61B and 61C may be part of a mesh structure in the body 10, the first branch 30 or the second branch 50. The three support rings 61A, 61B, and 61C are knitted with a single knitting yarn. In the present embodiment, when knitting, the knitting yarn is first knitted in a sine wave path in the circumferential direction of each of the main body 10, the first branch 30, and the second branch 50 from the starting point O1 until the knitting yarn reaches the starting point O1 again. Then, the braided wire is extended to the boundary between the support rings 61A and 61B in the direction of the support ring 61B, that is, the braided wire reaches the starting point O2 of the support ring 61B, and is braided in a sinusoidal path in the circumferential direction of each of the main body 10, the first branch 30, and the second branch 50, thereby completing the braiding of the support ring 61B. By analogy, the weaving of the support ring 61C is completed. It is understood that in the present embodiment, the starting point O1 is a peak 614 of the support ring 61A, the starting point O2 is a valley 615 of the support ring 61A, and the starting point O2 is a peak 614 of the support ring 61B.

In a modified embodiment, only one support ring 61A and none of the adjacent support rings 61B and 61C are included in the body 10, the first branch 30, or the second branch 50.

It can be understood that, in the process that the knitting line is knitted along the sine wave path in the circumferential direction of each of the body 10, the first branch 30 or the second branch 50 from the starting point O1 until the knitting line reaches the starting point O1 again, the number of turns of the knitting line around the central axis of the body 10, the first branch 30 or the second branch 50 may be one or more, and a plurality of turns of the first sub-support ring and the second sub-support ring … … are stacked in the radial direction after the knitting line is wound around the central axis, as shown in fig. 4, the sub-support ring of the last knitting overlaps the sub-support ring of the previous knitting, and the wave bar of each sub-support ring forms several crossing points with the wave bar of the inner side or the outer side thereof. In two adjacent intersections, the wave bars of the outer sub-rings are both disposed outside the wave bars of the inner sub-rings. Specifically, the support ring 61 in fig. 4 includes four sub-support rings formed by four turns of the braided wire around the central shaft, and in order to distinguish the four sub-support rings, the four turns of the support ring in fig. 4 are respectively denoted as Q1, Q2, Q3, Q4. As described above, the side of the main body 10, the first branch 30 and the second branch 50 facing the respective cavities is the inner side, the side of the main body 10, the first branch 30 and the second branch 50 facing away from the respective cavities is the outer side, specifically, in fig. 4, the inner side is taken along the direction of the paper surface, the outer side is taken along the direction of the paper surface, and the sub-support rings Q1, Q2, Q3 and Q4 are sequentially stacked in the radial direction from the inner side to the outer side. Two adjacent intersection points formed by the wave bars of the sub-support ring Q4 and the wave bars of the sub-support rings Q3 and Q2 are X1 and X2, and the sub-support ring Q4 is an outer sub-support ring compared with the sub-support rings Q3 and Q2. In the adjacent intersections X1 and X2, the wave bars of the sub-support ring Q4 are woven outside the wave bars of the sub-support rings Q3, Q2. The sub-support rings Q1, Q2, Q3, Q4 may be located in the main body 10, the first branch 30 or the second branch 50.

in the embodiment shown in fig. 5, at least one of the supporting rings in the bifurcated stent 100 (the body 10, the first branch 30 and the second branch 50) includes a first sub-supporting ring and other sub-supporting rings, which are arranged to overlap and penetrate in the radial direction around the axial direction of the body, the first branch or the second branch, the wave bars of the first sub-supporting ring form a plurality of intersections with the wave bars of the other sub-supporting rings, wherein at least there are adjacent first intersections and second intersections, at which the wave bars of the first sub-supporting ring are arranged outside with respect to the wave bars of the other sub-supporting rings intersecting therewith, and at the second intersections, the wave bars of the first sub-supporting ring are arranged inside with respect to the wave bars of the other sub-supporting rings intersecting therewith, at least one of the body 10, the first branch 30 and the second branch 50 includes one supporting ring shown in fig. 5, in particular, the supporting ring shown in fig. 5 includes four sub-supporting rings formed by four loops around the central axis, in order to distinguish the four sub-supporting rings, the four loops of the intersections in fig. 5 are respectively denoted as L1, L2, L03, L2, Y3.

It is to be understood that the number of the sub-support rings is not limited, for example, the number of the sub-support rings is one or more, and when the number of the sub-support rings is one, there is no multi-turn stacked sub-support ring or overlapping interpenetrated sub-support rings.

Referring to fig. 3 and 6, fig. 6 is a partially enlarged view of the bifurcated stent shown in fig. 1.

In the present embodiment, the peaks 614 and valleys 615 of adjacent support rings are arranged corresponding to each other, for example, the peaks 614 of the support ring 61A are arranged corresponding to the valleys (not shown) of the support ring 61B, and the valleys 615 of the support ring 61A are arranged corresponding to the peaks 614 of the support ring 61B.

Taking the body 10 as an example, in the embodiment where the body 10 has a plurality of support rings arranged in sequence along the axial direction, the distal support ring is the support ring near one end of the first branch 30 or the second branch 50, and between adjacent support rings in the body 10, the wave crests 614 of the distal support ring pass through the wave troughs 615 of the proximal support ring from inside to outside, so that the wave crests 614 of the distal support ring are hooked with the wave troughs 615 of the proximal support ring. For example, as shown in fig. 6, when the support ring 61B is woven, the peaks 614 of the support ring 61B are inserted into the valleys 615 of the support ring 61A and are inserted out of the valleys 615 of the first support ring 61A, so that the peaks 614 of the support ring 61B are hooked on the valleys 615 of the support ring 61A. As shown in fig. 7, when weaving the support ring 61C, the peaks 614 of the support ring 61C are inserted into the valleys 615 of the support ring 61B and are inserted out of the valleys 615 of the support ring 61B, so that the peaks 614 of the support ring 61C are hooked on the valleys 615 of the support ring 61B. Wherein the hooking positions between adjacent support rings are shown as circles in fig. 3.

The connection between adjacent support rings in the body 10 is described above for exemplary purposes only, and in the present embodiment, the connection between adjacent support rings in the first branch 30 and the second branch 50 is similar to the connection between adjacent support rings in the body 10.

In the present embodiment, the connection manner of the first branch 30 and the main body 10 and the connection manner of the second branch 50 and the main body 10 are the same as the connection manner between the adjacent support rings, that is, as shown in fig. 1, at the connection position of the main body 10 and the first branch 30, the wave crest 614 of the support ring of the first branch 30 close to the main body 10 penetrates from the inner side of the wave trough 615 of the support ring of the main body 10 close to the first branch 30 and penetrates from the outer side of the wave trough 615 of the support ring of the main body 10, so that the support ring of the first branch 30 is hooked on the support ring of the main body 10. At the connection of the body 10 and the second branch 50, the peaks 614 of the support ring of the second branch 50 near the body 10 penetrate from the inside of the troughs 615 of the support ring of the body 10 near the second branch 50 and penetrate from the outside of the troughs 615 of the support ring of the body 10, so that the support ring of the second branch 50 is hooked on the support ring of the body 10, and the peaks 614 of the support ring of the first branch 30 and/or the second branch 50 are connected with the troughs 615 of the support ring of the body 10. It will be appreciated that as the peaks 614 of the first or second legs 30, 50 pass from the inside to the outside through the valleys 615 of the main body 10, or alternatively, pass from the outside to the inside through the valleys 615 of the support ring of the main body 10, the braided wire may be wound around the valleys 615 of the support ring of the main body 10 a plurality of times to further increase the lattice density of the bifurcated stent 100 at the bifurcation regions 70, improving the occluding effect.

It will be appreciated that in alternate embodiments, the distal support ring peaks 614 may also pass from the outside to the inside through the proximal support ring valleys 615, whether between adjacent support rings of the body 10, first leg 30 and second leg 50, or between adjacent support rings where the body 10 joins the first leg 30 or where the body 10 joins the second leg 50. It will be appreciated that the distal ring peaks 614 are not limited to hooking into the proximal ring valleys 615, for example, the distal ring peaks 614 may be welded to the proximal ring valleys 615.

It is understood that the mesh structure provided by the above-mentioned weaving manner is only exemplary, and the number of the support rings is not limited to the above, for example, the number of the support rings may be one or more.

It will be appreciated that the plurality of support rings are not limited to being woven from one woven wire. For example, each support ring may be woven from more than one braided wire.

It is understood that the material of the braided wire is not limited, for example, the braided wire may be made of, but not limited to, a metal material such as nitinol wire, cobalt-based alloy wire, or stainless steel wire, and the braided wire may also be made of a polymer material.

In the present embodiment, the net structures of the main body 10, the first branch 30, and the second branch 50 are each woven by one woven wire, that is, the entire bifurcated stent 100 is woven by three wires. It will be appreciated that the entire bifurcated stent 100 is not limited to being formed from a wire weave, for example, the bifurcated stent 100 may be formed, but is not limited to being cut, by a laser.

In this embodiment, the braid nodes between every two wires are compressed by the steel jacket. It will be appreciated that the braided junctions between each two wires are not constrained to be compressed by the steel sleeve.

Referring to fig. 1 and 8, fig. 8 is a schematic perspective view of the bifurcated stent shown in fig. 1. It should be noted that fig. 8 exemplarily shows only a part of the mesh structure, and the mesh structure of the other region is not shown.

In the present embodiment, each of the first branch 30 and the second branch 50 includes a connecting portion 63 and a main body portion 65 integrally connected, the main body portion 65 is substantially cylindrical, and at least a portion of the connecting portion 63 is funnel-shaped and connected between the main body portion 65 and the main body 10. The crotch region 70 is at least partially disposed on the connecting portion 63.

In the present embodiment, the first branch 30 is taken as an example, a support ring of the first branch 30 close to the main body 10 forms the connecting portion 63, at least a portion of the connecting portion 63 is funnel-shaped, that is, the outer diameter of the funnel-shaped portion of the connecting portion 63 is gradually reduced along the direction from the main body 10 to the first branch 30, and the connecting portion 63 is used as a transition between the main body 10 and the first branch 30. The body portion 65 is substantially cylindrical and supports the inner wall of the branch blood vessel. In an application scenario, the main body 10 is intended for implantation in a main vessel, and the first branch 30 or the second branch 50 is intended for implantation in a branch vessel, wherein the inner diameter of the branch vessel is narrower than the inner diameter of the main vessel, so that at the transition between the branch vessel and the main vessel there tends to be a section of the inner diameter of the vessel which narrows from the main vessel in the direction of the branch vessel. Through setting up connecting portion 63 in this application, make connecting portion 63 can laminate the blood vessel inner wall of branch's blood vessel and main blood vessel transition position.

It will be understood that when the number of the support rings of the first branch 30 or the second branch 50 is one, the portion of the support ring close to the main body 10 is the connecting portion 63 and is at least partially funnel-shaped, and the portion of the support ring away from the main body 10 is the main body portion 65 and is cylindrical.

In the present embodiment, the net-like structures of the first branch 30 and the second branch 50 are woven from the distal end to the proximal end, and when the net-like structures are woven to the last ring of the first branch 30 or the second branch 50, i.e. to the connecting portion 63, the peaks 614 of the first branch 30 or the second branch 50 pass through the valleys 615 of the main body 10 from the inner side to the outer side, i.e. at the interface between the connecting portion 63 and the main body 10, the peaks 614 of the first branch 30 or the second branch 50 are hooked to the valleys 615 of the main body 10. It is understood that the first branch 30 and/or the second branch 50 may also be braided from the proximal end to the distal end.

It is understood that it is within the scope of the present application that the first branch 30 and/or the second branch 50 include the connecting portion 63.

Referring to fig. 8, 9 and 10 together, fig. 9 is a partially enlarged view of the bifurcation area of the bifurcated stent shown in fig. 1. FIG. 10 is a bottom view of the bifurcated stent of FIG. 8.

Notably, the network of the first branch 30 at the crotch region 70 intertwines with the network of the second branch 50 at the crotch region 70. More specifically, in the diverging region 70, the wave bar 612 on the side of the connecting portion 63 of the first branch 30 closer to the second branch 50 is intertwined with the wave bar 612 on the side of the connecting portion 63 of the second branch 50 closer to the first branch 30. In the bifurcation region 70, the wave-bars 612 of the second branch 50 penetrate from the inside of the wave-bars 612 of the first branch 30 and penetrate from the outside of the wave-bars 612 of the first branch 30, so that the wave-bars 612 of the first branch 30 and the wave-bars 612 of the second branch 50 are twisted with each other to reduce the distance between the wave-bars 612 of the first branch 30 and the second branch 50 in the bifurcation region 70, thereby making the lattice density of the bifurcated stent 100 in the bifurcation region 70 greater than that in other regions of the bifurcated stent 100. Thus, compared to the case where the bifurcation region between the first branch 30a and the second branch 50a is not covered by the braided wire to form a hollow region in the conventional bifurcated stent shown in fig. 11, the bifurcated stent 100 (shown in fig. 10) provided by the present application makes the mural thrombus at the position of the bifurcation region 70 less likely to break away from the bifurcation region 70 and flow to other positions with blood because the hollow region of the bifurcation region 70 is blocked by the intertwined wave bars 612, and increases the contact area between the bifurcation region 70 of the bifurcated stent 100 and the blood vessel wall at the bifurcation position, so that the intertwined wave bars 612 provide support for the blood vessel wall at the bifurcation position.

It is to be understood that the number of the mutually wound wave rods 612 is not limited to two, and the number of the mutually wound wave rods 612 may be not limited to a plurality, for example, in an alternative embodiment, a plurality of wave rods 612 may be alternately wound.

Second embodiment

Referring to fig. 12 and 13 together, fig. 12 is a schematic structural view of a bifurcated stent according to a second embodiment of the present application, and fig. 13 is a schematic structural view of the bifurcated stent shown in fig. 12 viewed from below.

The bifurcation stent 300 according to the present embodiment is mainly different from the bifurcation stent 100 according to the first embodiment in that: the bifurcated stent 300 of the present embodiment further includes a connecting member 390, the connecting member 390 being connected between the mesh structures of the first and second branches 330 and 350, such that the lattice density of the bifurcated stent 300 in the bifurcation region 370 is greater than the lattice density of other regions of the bifurcated stent 300.

It will be appreciated that the connection 390 is not limited to being connected between the mesh structures of the first and second branches 330, 350, for example, the connection 390 may also be connected between the first branch 330 and the main body 310, or the connection 390 may also be connected between the second branch 350 and the main body 310, the connection 390 may also be disposed in the bifurcation region 370, the lattice density of the connection 390 in the bifurcation region 370 is greater than the lattice density of other regions of the bifurcation stent, if the connection 390 is also disposed in a region outside the bifurcation region 370, the lattice density of the connection 390 in the bifurcation region 370 is also greater than the lattice density of the portion outside the bifurcation region 370, so that the lattice density of the bifurcation stent 300 in the bifurcation region 370 is greater than the lattice density of other regions of the bifurcation stent 300.

In this embodiment, the link 390 is a mesh structure disposed in the bifurcation region 370, and the mesh density of the link 390 is greater than the mesh density of other regions of the bifurcated stent 300. It will be appreciated that the lattice density is not limited to being the same throughout the attachment members 390, for example, a greater lattice density may be provided in portions of the attachment members 390 located in the crotch region 370 and a lesser lattice density may be provided in portions of the attachment members 390 located outside of the crotch region 370.

In the present embodiment, the link 390 is integrally woven with the first and second branches 330 and 350.

It is understood that the connecting member 390 is not limited to be integrally woven with the first branch 330 and the second branch 350, for example, the connecting member 390 may be, but is not limited to, a pre-woven mesh patch connected between the mesh structures of the first branch 330 and the second branch 350 by sewing or wire fastening.

Third embodiment

Referring to fig. 14 and 15 in combination, fig. 14 is a bottom view of a bifurcated stent according to a third embodiment of the present application; FIG. 15 is an enlarged partial schematic view of the bifurcated stent of FIG. 14.

The bifurcation stent 400 provided in the present embodiment is mainly different from the bifurcation stent 300 provided in the second embodiment in that: the connector 490 of the bifurcated stent 400 is a wire wrap for connecting between the mesh structures of the first leg 430 and the second leg 450. Specifically, the wire wrap is fixedly connected between the wave bars 4612 of the first branch 430 and the second branch 450.

It will be appreciated that the number of windings is not limited. For example, the number of windings may be, but is not limited to, a plurality. It will be appreciated that when the number of windings is plural, the windings are adapted to be connected between the web of the first leg 430 and a winding, between the web of the second leg 450 and a winding, or between two windings.

Fourth embodiment

Referring to fig. 16 and 17 in combination, fig. 16 is a schematic structural view of a bifurcated stent according to a fourth embodiment of the present application; FIG. 17 is a bottom view of the bifurcated stent of FIG. 16.

The bifurcation stent 500 provided in the present embodiment is mainly different from the bifurcation stent 100 provided in the first embodiment in that: the bifurcation region 570 also extends from the junction of the first leg 530 and the second leg 550 to the main body 510. The bifurcated stent 500 includes the first cover 110 covering the bifurcation area 570, and the lattice density of the first cover 110 is greater than the lattice density of other areas of the bifurcated stent 500, so that mural thrombus at the bifurcation site of the blood vessel is not easily detached from the bifurcation area 570 covered by the first cover 110.

The first cover film 110 may be made of polyester fabric, PTFE, PET, or other polymer materials.

In this embodiment, the first cover 110 is sewn and secured between the wave beam 5612 of the first branch 530 and the wave beam 5612 of the second branch 550 to occlude the bifurcation area 570.

It is to be understood that the first cover film 110 is not limited to being sewn into the crotch region 570, for example, the first cover film 110 may be, but is not limited to being, secured into the crotch region 570 by adhesive.

Fifth embodiment

As shown in fig. 18, the bifurcation stent 600 provided in the present embodiment is mainly different from the bifurcation stent 500 provided in the fourth embodiment in that: the bifurcated stent 600 further comprises a second cover 120, wherein the second cover 120 is disposed at the intersection of the main body 610 and the first branch 630 as shown in fig. 18, wherein the lattice density of the first cover 110 is greater than the lattice density of the second cover 120, so that mural thrombus is not easily detached from the region covered by the second cover 120. The second cover film 120 may be made of polyester fabric, PTFE, PET, or other polymer materials.

It is understood that the placement of the second stent graft 120 is not limited, and the bifurcated stent 600 having the second stent graft 120 disposed outside the bifurcation area 670 is within the scope of the present application.

Within the scope of the technical principle of the present application, the specific technical solutions in the above embodiments may be mutually applicable, and are not described herein again.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.