CN116236331B

CN116236331B - Support braiding structure and braided support

Info

Publication number: CN116236331B
Application number: CN202211539009.0A
Authority: CN
Inventors: 付诗; 张宁; 张淼; 刘辰洋
Original assignee: Shanghai Li Kai Technology Co ltd
Current assignee: Shanghai Li Kai Technology Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-10-20
Anticipated expiration: 2042-12-02
Also published as: CN116236331A

Abstract

The application relates to a support braiding structure, comprising: the main knitting body is provided with more than two first knitting yarns along a first direction and more than two second knitting yarns along a second direction, and the first knitting yarns and the second knitting yarns are interwoven along a preset angle; the braided body has disposed thereon a cross-braided structure disposed between at least partially adjacent first braided filaments and/or between at least partially adjacent second braided filaments. The braiding wires along the first direction and the second direction are interwoven according to a preset angle to form a braiding main body, radial force of the bracket is provided, and the braiding main body is subjected to cross braiding to form a cross braiding structure, so that the braiding wires in different directions generate additional crossing points, friction force among a plurality of wires is increased, and accordingly the radial supporting force of the whole bracket is improved, namely, the radial force of the braided bracket is improved by increasing the number of crossing points of the braiding wires without changing the number of the braiding wires.

Description

Support braiding structure and braided support

Technical Field

The application relates to the technical field of medical equipment, in particular to a support knitting structure and a knitted support.

Background

Intracranial aneurysm rupture is the primary cause of subarachnoid hemorrhage, and current methods for treating intracranial aneurysms mainly include craniotomy neck clamp-closure and endovascular intervention. The intravascular interventional therapy has small wound and quick recovery, and is friendly to high-risk patients who are not suitable for craniotomy.

The current intravascular interventional treatment modes are divided into aneurysm embolism and blood flow guiding device implantation, wherein the aneurysm embolism is formed by releasing a spring coil in an aneurysm to cause local thrombosis, so that the aneurysm and circulation are blocked, and the treatment modes mainly comprise single spring coil aneurysm embolism, stent-assisted spring coil aneurysm embolism, balloon-assisted spring coil aneurysm embolism and the like. The blood flow guiding device reduces or weakens the blood flow impact in the aneurysm by changing the blood flow direction in the carrying aneurysm, achieves the purposes of blood retention and thrombosis in the aneurysm, and finally forms new endothelial cells on the stent surface and the aneurysm neck to realize the complete occlusion and cure of the aneurysm; at the same time, the reconstruction of the aneurysm-carrying artery is realized, and the risk of recurrence and recanalization of the aneurysm is reduced.

The aneurysm auxiliary stents commonly used at present are divided into a cutting stent and a braiding stent, and the blood flow guiding device is generally a braiding stent. The braided stent has better compliance and radial support force and has been widely used.

The braided stent is generally composed of a plurality of braided wires, and comprises two groups of braided wires which are respectively braided in different directions along the axial direction, and the braided wires in the two directions are interwoven with each other in a certain rule to form the integral shape of the stent, so that the radial force of the stent is provided. For intracranial stents, it is desirable that they have a sufficiently high radial force to open themselves successfully when delivered to the site of the lesion.

The conventional braiding technology is adopted, namely under the condition that the number of the braiding wires is the same, the number of the interleaving points of the braiding wires in the bracket is fixed, and on the basis of the fixed number of the interleaving points on the braiding wires, how to further improve the radial supporting force of the bracket is a current technical difficulty.

Disclosure of Invention

In view of the above, the present application provides a stent braiding structure, comprising a braiding body, wherein the braiding body is provided with more than two first braiding wires along a first direction and more than two second braiding wires along a second direction, and the first braiding wires and the second braiding wires are interwoven along a preset angle; the braiding body is provided with a cross braiding structure, the cross braiding structure is arranged between at least part of adjacent first braiding wires and/or the cross braiding structure is arranged between at least part of adjacent second braiding wires.

In one possible implementation manner, one strand of the cross-knitting structure is that two cross-knitting wires cross along a first direction for a plurality of times to form a plurality of first crossing points, and the second knitting wires are arranged between two adjacent first crossing points in a penetrating manner, or two cross-knitting wires cross along a second direction for a plurality of times to form a plurality of second crossing points, and the first knitting wires are arranged between two adjacent second crossing points in a penetrating manner.

In one possible implementation, the total number of braiding filaments on the braided body and the cross-braided structure is an even number; wherein the number of the first braiding wires is the same as the number of the second braiding wires, and the number of the cross braiding wires in the first direction is the same as the number of the cross braiding wires in the second direction.

In one possible implementation, the cross-weave structure is uniformly laid over the woven body.

In one possible implementation, the spacing between two of the first or second braided filaments provided with the cross-braided structure is greater than the spacing between the remaining adjacent braided filaments.

In one possible implementation manner, the knitting yarn arranged along the first direction and the knitting yarn arranged along the second direction are knitting yarns in different directions, and the intersection knitting structure and the position where the intersection knitting structure and the knitting yarn in the different directions intersect are interweaving points; the number of the first intersecting points or the number of the second intersecting points of one strand of the cross-woven structure is smaller than or equal to the number of the interweaving points of the cross-woven structure and the braided wires in different directions.

In one possible implementation manner, two adjacent first braiding wires are arranged in a crossing manner along the first direction, and the structure of the two adjacent first braiding wires is the same as that of the crossing braiding structure; the two adjacent second braiding wires are arranged in a crossing way along the second direction, and the structure of the two adjacent second braiding wires is the same as the crossed braiding structure.

In one possible implementation, the predetermined angle is in the range of 90 ° -150 °.

In one possible implementation, the braided body and the braided filaments in the cross-braided structure are identical and have a filament diameter in the range of 0.001 inch to 0.004 inch.

On the other hand, the application also provides a braided stent, which comprises a stent main body made of the stent braided structure in any implementation mode, wherein the outer diameter of the stent main body is between 1.5mm and 7mm, and the two axial side ends of the stent main body are connected through braided wires to form a closed structure.

The application has the beneficial effects that: the braiding wires in the first direction and the second direction are interwoven along a preset angle to form a braiding main body of a single-layer structure, so that radial force of the bracket is provided, and the braiding main body is crossed and braided to form a crossed braiding structure, so that the braiding wires in different directions generate additional crossing points, friction force among a plurality of wires is increased, and accordingly the radial supporting force of the whole bracket is improved, namely, the radial force of the braided bracket is improved by increasing the number of crossing points of the braiding wires without changing the number of the braiding wires.

Moreover, compared with the traditional support braiding structure, the support braiding structure has the advantages that under the condition that the number of braiding wires is the same, more crossing points are formed through the braiding wires which are crossed with each other, so that the overall radial force of the formed support is effectively improved, the support is easier to open in a blood vessel, the wall attaching and anchoring effects are better, and the anti-kink capacity is better.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the application and together with the description, serve to explain the principles of the application.

Fig. 1 shows a schematic side structural view of a stand body according to an embodiment of the present application;

FIG. 2 is a schematic side view showing a cross-weave structure on a stent body according to an embodiment of the present application;

fig. 3 is a schematic side view showing a structure of a stand body according to another embodiment of the present application;

FIG. 4 illustrates a partial enlarged view of a cross-weave structure according to an embodiment of the application;

FIG. 5 shows a partial schematic view of a cross-weave structure according to a first embodiment of the application;

FIG. 6 shows a partial schematic view of a cross-weave structure according to a second embodiment of the application;

FIG. 7 shows a partial schematic view of a cross-weave structure according to a third embodiment of the application;

FIG. 8 shows a partial schematic view of the cross-weave structure of FIG. 1 in accordance with the application;

FIG. 9 shows a partial schematic view of a cross-weave structure according to a fourth embodiment of the application;

fig. 10 shows a partial schematic view of a cross-woven structure on a side of a stent body according to a fourth embodiment of the application;

FIG. 11 shows a graph of the radial force of a corresponding stent body over one cycle of the stent body from compression to opening for a different number of cross-woven structures on the stent body of the present application;

fig. 12 shows a partial enlarged view of an end closure structure of a stent body according to the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the application will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It should be understood, however, that the terms "center," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the application or simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

In addition, numerous specific details are set forth in the following description in order to provide a better illustration of the application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application.

Fig. 1 shows a schematic side structural view of a stand body according to an embodiment of the present application; FIG. 2 is a schematic side view showing a cross-weave structure on a stent body according to an embodiment of the present application; fig. 3 is a schematic side view showing a structure of a stand body according to another embodiment of the present application; FIG. 4 illustrates a partial enlarged view of a cross-weave structure according to an embodiment of the application; FIG. 5 shows a partial schematic view of a cross-weave structure according to a first embodiment of the application; FIG. 6 shows a partial schematic view of a cross-weave structure according to a second embodiment of the application; FIG. 7 shows a partial schematic view of a cross-weave structure according to a third embodiment of the application; FIG. 8 shows a partial schematic view of the cross-weave structure of FIG. 1 in accordance with the application; FIG. 9 shows a partial schematic view of a cross-weave structure according to a fourth embodiment of the application; fig. 10 shows a partial schematic view of a cross-woven structure on a side of a stent body according to a fourth embodiment of the application; FIG. 11 shows a graph of the radial force of a corresponding stent body over one cycle of the stent body from compression to opening for a different number of cross-woven structures on the stent body of the present application; fig. 12 shows a partial enlarged view of an end closure structure of a stent body according to the present application.

As shown in fig. 1 to 12, the stent braiding structure includes: a woven body 101, wherein the woven body 101 is provided with more than two first woven wires 1011 along a first direction and more than two second woven wires 1012 along a second direction, and the first woven wires 1011 and the second woven wires 1012 are interwoven along a preset angle α; a cross braid structure 102 is disposed over braid body 101, with cross braid structure 102 disposed between at least partially adjacent first braid wires 1011 and/or cross braid structure 102 disposed between at least partially adjacent second braid wires 1012.

In this embodiment, the braided body 101 of a single layer structure is formed by braiding wires in both the first direction and the second direction at a predetermined angle α, a radial force of the stent is provided, and the braided body 101 is cross-braided to form the cross-braided structure 102, so that the braided wires in different directions generate additional crossing points 201, and a frictional force between a plurality of wires is increased, thereby improving a radial supporting force of the stent as a whole, that is, simply, by increasing the number of crossing points 201 of the braided wires, but not changing a method of the number of the braided wires, thereby improving a radial force of the braided stent.

The preset angle α between the first direction and the second direction referred to herein is: when the braided stent is unfolded in a plane, the first braided wire 1011 in the first direction forms an angle with the second braided wire 1012 in the second direction.

In one embodiment, one strand of the cross-woven structure 102 is formed by multiple crossing of two cross-woven wires 1021 along a first direction to form multiple first crossing points 2011, and the second woven wires 1012 are arranged between two adjacent first crossing points 2011, or by multiple crossing of two cross-woven wires 1021 along a second direction to form multiple second crossing points 2012, and the first woven wires 1011 are arranged between two adjacent second crossing points 2012.

In this embodiment, compared with the conventional stent braiding structure, the stent braiding structure of the present application forms more intersecting points 201 through the braiding wires intersecting with each other under the same number of braiding wires, so that the radial force of the whole formed stent is effectively improved, the stent is easier to open in a blood vessel, the wall attaching and anchoring effects are better, and the anti-kink capability is better.

It should be specifically noted that, the intersecting point 201 referred to herein is two intersecting braided wires 1021 arranged in the same direction, and the intersecting point is the intersecting point 201 by alternating the upper and lower relationship of the intersecting braided wires 1021; further, the interweaving points 202 referred to herein are all points of intersection where the cross-woven structure 102 intersects with one braided wire in an opposite direction.

In one embodiment, the total number of filaments on the woven body 101 and the cross-woven structure 102 is even; the number of the first knitting yarns 1011 is the same as the number of the second knitting yarns 1012, and the number of the cross knitting yarns 1021 in the first direction is the same as the number of the cross knitting yarns 1021 in the second direction.

In this embodiment, the distribution of the cross-weave structures 102 determines the number of cross-points 201 of the stent body 100, i.e., the radial force of the stent. The distribution of the cross-weave structures 102 in the stent may be varied, desirably with a total number of weave filaments m=2n, m being an even number greater than or equal to 4, n being the number of weave filaments in one of the first and second directions in the stent.

In one embodiment, the cross-weave structure 102 is uniformly laid across the weave body 101.

As shown in fig. 3, two cross-weave filaments 1021 in the cross-weave structure 102 may be crossed in such a way that one is above the other and the other is below it; or one can be under and the other can be on top. The weaving track of the weaving wires around the bracket is a circulation, and in the circulation, two crossed weaving wires 1021 can form a multi-time crossed weaving structure 102 according to a certain distribution rule.

In one particular embodiment, the spacing between two first filaments 1011 or two second filaments 1012 provided with the cross-woven structure 102 is greater than the spacing between the remaining adjacent filaments.

In one embodiment, the braiding wires arranged in the first direction and the braiding wires arranged in the second direction are braiding wires in different directions from each other, and the intersection point 202 is the intersection point of the cross-braiding structure 102 and the braiding wires in the different directions; the number of first crossover points 2011 or the number of second crossover points 2012 of a strand of cross-woven structure 102 is equal to or less than the number of interweaving points 202 of the cross-woven structure 102 with filaments of different directions.

The number of intersecting points 201 at which two intersecting filaments 1021 can form an intersecting weave in one cycle is an integer a, and the number of interlacing points 202 between two intersecting filaments 1021 and filaments in different directions is n, so that a is equal to or less than n.

As shown in fig. 5, in one embodiment, a=n, that is, two cross-knitting yarns 1021 are interwoven with the same knitting yarn in different directions 1 time and then cross-knitted;

as shown in fig. 6, in one embodiment, a=n/2, that is, two cross-knitting yarns 1021 are interwoven with the same knitting yarn in different directions for 2 times, and then cross-knitting is performed;

as shown in fig. 7, in one embodiment, a=n/3, two cross-knitting filaments 1021 are interwoven 3 times with the same knitting filament in different directions, and then cross-knitting is performed.

Further, two cross-weave filaments 1021 in the second direction may also form a cross-weave structure 102 with two cross-weave filaments in the first direction.

In one specific embodiment, a=n/2, and two cross-knitting yarns in the first direction and the second direction are interwoven 2 times respectively and then are cross-knitted to form a structure shown in fig. 8;

in one embodiment, two adjacent first braiding wires 1011 are arranged to cross in a first direction and have the same structure as the cross braiding structure 102; two adjacent second filaments 1012 are arranged crosswise in the second direction and have the same structure as the cross-weave structure 102.

Further, a cross-weave structure 102 may be formed between t sets of weave filaments in the stent, t.ltoreq.n.

In one embodiment, a=n/2, t=n sets of filaments in the stent are interwoven and then cross-woven to form the structure shown in fig. 8, and fig. 10 is a schematic view of a portion of the stent body.

In one embodiment, the predetermined angle α is in the range of 90 ° -150 °.

In this embodiment, it is preferable that the predetermined angle α between the first braid 1011 of the first direction and the second braid 1012 of the second direction is in the range of 90 ° -150 °.

Further, in one embodiment, the first braided wire 1011 in the first direction forms the same angle with the axial direction of the stent as the second braided wire 1012 in the second direction forms the same angle with the axial direction of the stent. In other words, the first braided wire 1011 in the first direction and the second braided wire 1012 in the second direction are symmetrically disposed along the axis of the braided stent.

In one embodiment, the braided filaments in braided body 101 and cross-braided structure 102 are identical and have a filament diameter in the range of 0.001 inch to 0.004 inch.

In this embodiment, the material of the braided wire may be nickel titanium, cobalt chromium, stainless steel, polymer, tantalum or a mixture thereof, which is not limited herein.

On the other hand, the application also provides a braided stent, which comprises a stent main body 100 made of the stent braided structure in any embodiment, wherein the outer diameter of the stent main body 100 is between 1.5mm and 7mm, and the two axial side ends of the stent main body 100 are connected through braided wires to form a closed structure 300.

Based on the support knitting structure, the application also provides a knitting support. The woven stent of the embodiment of the application is made of the stent woven structure according to any one of the above. By forming any one of the above stent braiding structures into a hollow cylindrical structure, a plurality of cross braiding structures 102 with cross braiding on the braided body 101 are formed, so that the braiding wires in different directions generate additional interleaving points 201, friction force between a plurality of wires is increased, and thus radial supporting force of the whole stent is improved, radial force of the braided stent is improved by increasing the number of interleaving points 201 of the braiding wires without changing the number of the braiding wires, and both ends of the stent body 100 are sealed by the braiding wires, and when the stent is released into a blood vessel, damage to the blood vessel by both end parts of the stent body 100 is avoided.

In one embodiment, the stent body 100 has an open structure at both axial ends.

Preferably, both axial side ends of the stent body 100 are connected by braiding wires to form a closed structure 300.

In this embodiment, both axial side ends of the stent body 100 are formed into a closed structure 300 of both end edges by braiding wires. The two filaments at the ends are joined together by welding or glue bonding, or the filaments are wrapped around the ends by tooling during braiding to form a closed structure 300 (shown in fig. 12). In actual use, the ends of the closure structure 300 are less damaging to the vessel when the braided stent is released.

As shown in fig. 2 and 11, the number of strands of the cross-woven structure 102 is generally even, and may be two strands (as shown in fig. 2), four strands and six strands uniformly distributed on the woven body 101, so that the trend of the radial supporting force of the stent 100 is shown when the stent body 100 is provided with the two strands of the cross-woven structure 102, the four strands of the cross-woven structure 102 and the six strands of the cross-woven structure 102 in the coordinate system of fig. 11.

The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. The bracket braiding structure is characterized by comprising a braiding main body, wherein more than two first braiding wires are arranged on the braiding main body along a first direction, more than two second braiding wires are arranged along a second direction, and the first braiding wires and the second braiding wires are interwoven along a preset angle;

a cross braiding structure is arranged on the braiding main body, and the cross braiding structure is arranged between at least part of adjacent first braiding wires and/or between at least part of adjacent second braiding wires;

the two cross braiding wires are crossed for a plurality of times along a first direction to form a plurality of first crossing points, the second braiding wires are penetrated between two adjacent first crossing points, or the two cross braiding wires are crossed for a plurality of times along a second direction to form a plurality of second crossing points, and the first braiding wires are penetrated between two adjacent second crossing points.

2. The stent braiding structure of claim 1, wherein the total number of braided filaments on the braided body and the cross-braided structure is an even number;

wherein the number of the first braiding wires is the same as the number of the second braiding wires, and the number of the cross braiding wires in the first direction is the same as the number of the cross braiding wires in the second direction.

3. The stent braiding structure of claim 1, wherein the cross-braiding structure is uniformly disposed over the braided body.

4. The stent braiding structure of claim 2, wherein a spacing between two of the first braided filaments or two of the second braided filaments provided with the cross-braiding structure is greater than a spacing between remaining adjacent braided filaments.

5. The stent braiding structure of claim 1, wherein braiding wires arranged in the first direction and braiding wires arranged in the second direction are braiding wires in different directions from each other, and wherein the intersection braiding structure and the intersection positions of the intersection braiding wires in the different directions are interweaving points;

the number of the first intersecting points or the number of the second intersecting points of one strand of the cross-woven structure is smaller than or equal to the number of the interweaving points of the cross-woven structure and the braided wires in different directions.

6. The stent braiding structure of claim 1, wherein two adjacent first braiding wires are arranged to intersect in the first direction and have the same structure as the intersecting braiding structure;

the two adjacent second braiding wires are arranged in a crossing way along the second direction, and the structure of the two adjacent second braiding wires is the same as the crossed braiding structure.

7. The stent woven structure of any one of claims 1-6, wherein the predetermined angle is in the range of 90 ° -150 °.

8. The stent woven structure of any one of claims 1-6, wherein woven wire structures in the woven body and the cross-woven structure are identical and have a wire diameter in the range of 0.001 inch to 0.004 inch.

9. A braided stent, characterized by comprising a stent main body which is made into a hollow cylindrical structure by using the stent braided structure as claimed in any one of claims 1-8, wherein the outer diameter of the stent main body is between 1.5mm and 7mm, the length of the stent main body is between 10mm and 80mm, and the two axial side ends of the stent main body are connected through braided wires to form a closed structure.

10. The stent of claim 9, wherein the braided wire is one or more of nickel titanium, cobalt chromium, stainless steel, high molecular polymer, tantalum, and nickel titanium with platinum-containing gold core, and the number of braided wires is 16 or 32 or 48 or 64 or 72 or 96.