Disclosure of Invention
In view of the above, the present application proposes a braided stent comprising a stent body; the bracket main body is a hollow cylinder structure which is formed by interweaving one or more braided wire strands arranged along a first direction and one or more braided wire strands arranged along a second direction; wherein the braided strands in a first direction are first strands and the braided strands in a second direction are second strands; the braiding yarn in at least one direction is formed by twisting more than two braiding yarns clockwise or anticlockwise.
In one possible implementation, the braided filaments in the first strand are twisted with each other clockwise or counterclockwise; the braided filaments in the second strand are twisted with each other in a clockwise or counterclockwise direction.
In one possible implementation, the braided filaments in the first strand are twisted with each other clockwise or counterclockwise; the braided filaments in the second strand are arranged linearly.
In one possible implementation, when the number of the first strands and the second strands is more than two, the first strands and the second strands are regularly crossed at equal intervals, and the first strands and the second strands are crossed to form a crossing point;
wherein the crossing points of two adjacent second strands and the same first strand are positioned at the opposite side of the first strand.
In one possible implementation, when the number of the first strands and the second strands is more than two, the first strands and the second strands are regularly crossed at equal intervals, and the first strands and the second strands are crossed to form a crossing point;
Wherein the intersection points of two alternate second strands and the same first strand are positioned on the opposite side of the first strand.
In one possible implementation, the number of braided strands on the stent body is an even number;
wherein the number of braided strands in the first direction is equal to the number of braided strands in the second direction.
In one possible implementation, the braided wire strand in the first direction is composed of two braided wires, and the braided wire strand in the second direction is composed of two braided wires.
In one possible implementation manner, in the same braided wire strand with a wire twisting structure, a plurality of braided wires are twisted once in a clockwise or counterclockwise direction, and the total number of times of twisting between two adjacent intersecting points on the braided wire strand is less than or equal to ten times.
In one possible implementation, the braided filaments have a filament diameter between 0.001 inch and 0.004 inch.
In one possible implementation, the intersection of the braided strands in a first direction and the braided strands in a second direction forms a braiding angle, the braiding angle being within 90 ° -150 °.
In one possible implementation, the stent body has an outer diameter between 1.5mm and 7 mm.
In one possible implementation, the material of the braided wire is one or more of nickel titanium, cobalt chromium, stainless steel, high molecular polymer, tantalum, or nickel titanium containing platinum gold core.
On the other hand, the application also provides a preparation method of the braided stent, which is used for preparing the braided stent; presetting a yarn carrier knitting track along the first direction on the knitting machine, presetting a yarn carrier knitting track along the second direction on the knitting machine, carrying out knitting operation on the yarn carrier along the two preset knitting tracks around a metal core rod on the knitting machine, and integrally forming the metal core rod to form a bracket knitting structure; and placing the metal core rod and the bracket weaving structure into a heat treatment furnace together for heat setting treatment to obtain the bracket main body.
In one possible implementation, the metal core rod is cylindrical or conical.
The application has the beneficial effects that: the braided wire strands arranged in the first direction and the second direction are interwoven to form the stent main body, and the braided wire strands in at least one direction are formed by twisting more than two braided wires clockwise or anticlockwise.
Moreover, the braiding silk strand that the silk structure presented has increased its rigidity to make the local compressive capacity of support obtain promoting, if when the blood vessel pulsation, support part has sufficient holding power, can follow the blood vessel inner wall always, laminating blood vessel wall, can not take place to anchor and not be fixed, avoided the condition that the support produced the displacement. Meanwhile, as an auxiliary support, the spring ring is arranged in the aneurysm, and the support can play a better role in supporting the spring ring outside.
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.
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 main body structure of a braided stent of an embodiment of the present application; FIG. 2 shows a schematic structural view of a first strand and a second strand according to an embodiment of the present application; FIG. 3 shows an enlarged view of a portion of a threading structure of an embodiment of the present application; FIG. 4 shows a partial schematic view of a braided strand interweaving in accordance with an embodiment of the present application; FIG. 5 shows a partial schematic view of a braided strand interlacing of another embodiment of the present application; FIG. 6 shows a partial schematic view of a braided strand interlacing of a third embodiment of the present application; fig. 7 shows an application scenario diagram of a braided stent of an embodiment of the present application in a blood vessel.
As shown in fig. 1-7, the braided stent comprises: the bracket body 10 comprises a bracket body 10 and a hollow cylinder structure, wherein the bracket body 10 is formed by interweaving one or more braiding wire strands 100 arranged along a first direction and one or more braiding wire strands 100 arranged along a second direction, the braiding wire strands 100 along the first direction are first wire strands 110, the braiding wire strands 100 along the second direction are second wire strands 120, and the braiding wire strands 100 in at least one direction comprise more than two braiding wires 101 which are twisted with each other clockwise or anticlockwise.
In this embodiment, the stent body 10 is made by interweaving the braided wire strands 100 in the first direction and the second direction, and the braided wire strands 100 in at least one direction are made up of more than two braided wires 101 twisted clockwise or counterclockwise, and the braided wire strands 100 twisted clockwise or counterclockwise have a structure that improves the flexibility of the entire stent compared with the stent body 10 made directly from a single braided wire 101, which is advantageous for the intravascular delivery of the braided stent of the present application.
Moreover, the structure of the twisting structure 200 increases the rigidity of the braided wire strand 100, so that the local compressive capacity of the stent is improved, for example, when 300 pulses occur, the stent has enough supporting force locally, can always conform to the inner wall of the blood vessel 300 and is attached to the wall 300, and the situation that the stent is not anchored and is prevented from displacement is avoided. Meanwhile, as an auxiliary support, the spring ring is arranged in the aneurysm, and the support can play a better role in supporting the spring ring outside.
In short, the plurality of braided wires 101 in the same direction are twisted with each other, that is, twisted to some extent to form one braided wire strand 100, and then interwoven with the braided wire strand 100 in the other direction to form the stent body 10.
More specifically, the shape of the single first direction braided wire strand 100 or the single second direction braided wire strand 100 in the whole support is similar to a spring structure, and the shape characteristic provides flexibility of the support, in the scheme of the application, on the basis, more than two braided wires 101 are twisted clockwise or anticlockwise, so that the shape of the single braided wire strand 100 is also a spring structure, several braided wires 101 in the same direction are twisted with each other, namely, after being twisted to a certain extent, are interwoven with braided wires 101 in the other direction to form the support, and the spring winding mode not only can improve the flexibility of the support, but also can improve the rigidity of the braided wire strand 100, thereby improving the local compressive resistance of the support.
In one embodiment, the braided filaments 101 in the first strand 110 are twisted with each other clockwise or counterclockwise, and the braided filaments 101 in the second strand 120 are twisted with each other clockwise or counterclockwise.
By this embodiment, it can be understood that: the twisting directions of the first strands 110 and the second strands 120 are generally divided into three types:
1. The total braided filaments 101 of the first strand 110 are twisted with each other clockwise, and the braided filaments 101 in the second strand 120 are twisted with each other clockwise.
2. The total braided filaments 101 of the first strand 110 are twisted with each other clockwise, and the braided filaments 101 of the second strand 120 are twisted with each other counterclockwise.
3. ; Or the total braided filaments 101 of the first strand 110 are twisted with each other in a counterclockwise direction, and the braided filaments 101 in the second strand 120 are twisted with each other in a counterclockwise direction.
Further, in one embodiment, the braided filaments 101 in the first strand 110 are twisted with each other clockwise or counterclockwise, and the braided filaments 101 in the second strand 120 are arranged linearly.
In this embodiment, the plurality of braided wires 101 in the braided wire strand 100 in the first direction are twisted clockwise or counterclockwise to form the wire twisting structure 200, the braided wires 101 in the second direction are not twisted, and are arranged linearly, so that the compliance of the stent body 10 is not as good as that of the stent body 10 twisted clockwise in the first direction and twisted counterclockwise in the second direction, and the compliance and the local compression resistance of the stent body 10 are in a relatively moderate range.
More specifically, as shown in fig. 6, the braided wire strand 100 in one direction in the stent is not twisted, the braided wire strand 100 in the other direction is twisted, the braided wire strand 100 in the stent body 10 includes two braided wires 101, the number of times the braided wire strand 100 in one direction is twisted is 2, and the number of times the braided wire strand 100 in the other direction is twisted is 0.
In one embodiment, the stent body 10 is formed by braiding at least 4 braided filaments 101, and the braided filaments 101 material may be nitinol, cobalt chromium, DFT containing platinum Jin Naxin, stainless steel, polymer, tantalum, or a hybrid combination thereof.
Preferably, the wire diameter of the braided wire 101 ranges from 0.0010 inch to 0.0040 inch, the outer diameter of the stent body 10 ranges from 1.5mm to 7mm, and the angle between the braided strands 100 in the first direction and the braided strands 100 in the second direction ranges from 90 ° to 150 °.
In one embodiment, the first strands 110 are regularly intersecting the second strands 120 at equal intervals, the first strands 110 intersecting the second strands 120 to form an intersection 201, wherein the intersection 201 of two adjacent second strands 120 with the same first strand 110 is on the opposite side of the first strand 110.
As shown in fig. 4, in this embodiment, the braiding structure of the stent body 10 includes a common regular structure, where the intersecting points 201 of two adjacent second strands 120 and the same first strand 110 are located on opposite sides of the first strand 110, and the opposite sides referred to herein are understood as two adjacent intersecting points 201 on the same first strand 110, one intersecting point 201 is overlapped on the inner side of the first strand 110, the other intersecting point is overlapped on the outer side of the first strand 110, that is, the braided strands 100 in different directions are interwoven with each other in a "1-to-1" rule, the number of braided strands 100 in the same direction is 2, and the number of twisting times of the braided strands 100 and the braided strands 100 is 2.
In one embodiment, the first strands 110 and the second strands 120 are regularly crossed at equal intervals, the first strands 110 and the second strands 120 intersect to form an intersection 201, wherein the intersection 201 of two second strands 120 located in between and the same first strand 110 is located on the opposite side of the first strand 110.
In this embodiment, it should be construed that the term "spaced" as used herein means two second strands 120 disposed at a distance from each other, that is, two second strands 120 disposed at a distance from one second strand 120, one of the two second strands 120 being located at the inner side of the first strand 110 and the other being located at the outer side of the first strand 110, at points where the two second strands 120 intersect with the first strand 110.
As shown in fig. 5, in this embodiment, the braiding structure of the stent body 10 includes a common regular structure, and the above-mentioned "1-press 1" is the same, in this embodiment, the braided strands 100 in different directions are interwoven with each other in the "2-press 2" rule, and each braided strand 100 in the same direction includes two braided filaments 101, and the number of twisting times of the braided strands 100 and the braided strands 100 is 2.
In one embodiment, the number of braided strands 100 on the stent body 10 is an even number, wherein the number of braided strands 100 in the first direction is equal to the number of braided strands 100 in the second direction.
In one embodiment, in the same braided wire strand 100 having the wire twisting structure 200, a plurality of braided wires 101 are twisted once in a clockwise or counterclockwise direction, and the total number of times of twisting between two adjacent intersecting points 201 on the braided wire strand 100 is ten or less.
In this embodiment, after the braided wire strands 100 in different directions are interwoven once, the plurality of braided wires 101 on the same braided wire strand 100 continue to be twisted clockwise or anticlockwise to form a wire twisting structure 200, the number of times of twisting is m, after the wire twisting is completed, the braided wire strands 100 in the first direction and the braided wire strands 100 in the second direction are interwoven again, and m is less than or equal to ten. That is, the number of times the plurality of braided wires 101 are twisted in total is ten or less between two adjacent crossing points 201 on the same braided wire strand 100.
It should be further explained here that, regarding the angle of single twisting, taking two braided wires 101 as an example, two braided wires are rotated one turn in the clockwise direction or the counterclockwise direction, which is referred to as single twisting.
As shown in FIG. 7, in one embodiment, the braided stent may be used as an auxiliary spring coil embolic stent that still adheres well to the curved segment of the vessel 300, and may better exhibit good flexibility and radial compression resistance.
In one embodiment, the braided strand 100 in the first direction is composed of two braided filaments 101, and the braided strand 100 in the second direction is composed of two braided filaments 101.
In one embodiment, the wire diameter of braided wire 101 is between 0.001 inch and 0.004 inch.
In one embodiment, the intersection of the braided strands 100 in the first direction and the braided strands 100 in the second direction form a braiding angle within the range of 90 ° -150 °.
In one embodiment, the stent body 10 has an outer diameter of between 1.5mm and 7 mm.
In one embodiment, the stent body has an outer diameter of between 1.5mm and 7 mm.
In one embodiment, the material of the braided wire is one or more of nickel titanium, cobalt chromium, stainless steel, high molecular polymer, tantalum or nickel titanium containing platinum-gold inner core.
On the other hand, the application also provides a preparation method of the braided stent, which is used for preparing the braided stent; presetting a yarn carrier knitting track along the first direction on the knitting machine, presetting a yarn carrier knitting track along the second direction on the knitting machine, carrying out knitting operation on the yarn carrier along the two preset knitting tracks around a metal core rod on the knitting machine, and integrally forming the metal core rod to form a bracket knitting structure; and placing the metal core rod and the bracket weaving structure into a heat treatment furnace together for heat setting treatment to obtain the bracket main body.
The yarn carrier knitting track is knitted into the knitting yarn strand in the first direction along the first direction, the yarn carrier knitting track is knitted into the knitting yarn strand in the second direction along the second direction, and in general, the first direction and the second direction are opposite, namely, the first direction is anticlockwise, the second direction is preferably clockwise, the first direction and the second direction can have the same knitting angle, and a more specific preset knitting track can be adjusted by a person skilled in the art according to a more specific implementation mode, and the preset knitting track is not changed in the application and can be directly realized by using the prior art, so that the application is not repeated herein.
In one embodiment, the metal core rod is cylindrical or conical.
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.