CN116350411A

CN116350411A - Support braiding method and support braided by using same

Info

Publication number: CN116350411A
Application number: CN202310380420.6A
Authority: CN
Inventors: 檀涛; 柳全乐; 陶凯; 周玉
Original assignee: Jiangsu Weidekang Medical Science & Technology Co ltd
Current assignee: Jiangsu Weidekang Medical Science & Technology Co ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-06-30

Abstract

The invention discloses a bracket braiding method and a bracket braided by the method, comprising the steps that two wires are respectively wound on a cylindrical die to form an upper bracket and a lower bracket, the upper bracket and the lower bracket respectively comprise a plurality of diamond braiding layers and triangular braiding layers axially positioned between the diamond braiding layers, the diamond braiding layers and the triangular braiding layers are alternately wound along diagonal directions, the wires on the triangular braiding layers are not crossed, and the axial ends of the upper bracket and the lower bracket are mutually butted; the triangular braid corresponds to a bending region of the biliary tract. According to the stent braiding method and the stent braided by the method, the diamond braiding layer formed by the Cross braiding mode is combined with the triangular braiding layer formed by the Hook braiding mode, the triangular braiding layer is arranged in the bending area of the biliary tract system, and on the basis of meeting good compliance and bending performance, the bending radial force is smaller, so that the stent braiding method is more suitable for the biliary tract system.

Description

Support braiding method and support braided by using same

Technical Field

The invention relates to the technical field of medical equipment, in particular to a bracket braiding method and a bracket braided by using the method.

Background

Stents woven from materials having superior flexibility and expansibility are widely used in medical fields, mainly for preventing a narrowed portion from being narrowed and for smoothing the flow of substances in the body by expanding the diameters of various organs in the body, for example, for expansion of digestive tracts, expansion of extrahepatic bile ducts, and the like.

The knitting mode of the stent mainly comprises two modes, namely a Cross knitting mode basic unit and a hook knitting mode basic unit, which are shown in fig. 5, and a hook knitting mode basic unit, which is shown in fig. 1, most of the stents in the prior art adopt the Cross knitting mode, the stent formed by the Cross knitting mode has good bending performance and expansibility, the stent is arranged on a stent pusher, passes through the duodenum of a human body to enter a biliary tract system through an endoscope and is suitable for a narrow or obstructed part, but the bending angle between the biliary tract and the gall bladder is overlarge (the bending angle of the corner is larger when the gall bladder and the pancreatic tract are introduced into the gall bladder from the gall bladder and the pipe diagram shown in fig. 14), and the stent in the knitting mode has overlarge bending radial force generated during bending, the inner wall of the gall bladder is too weak to bear larger bending radial force, and inadaptation, such as abrasion or even puncture of the inner wall of the gall bladder can cause unnecessary bleeding. The operation is required to be completed safely and surely, and the operation level of the operator is extremely high.

Therefore, it is necessary to design a braided stent which can reduce radial force during bending, is more suitable for biliary tract system, reduces operation difficulty of operators and reduces risk of patients.

Disclosure of Invention

The invention provides a stent braiding method and a stent braided by the method, which aim to solve the technical problems that the braided stent in the prior art is important to improve bending performance and expansibility, is not suitable for weak positions in a biliary tract system, is easy to cause inadaptation of operations and has extremely high requirements on the operation level of operators.

The invention provides a bracket braiding method, which comprises the steps that two wires are respectively wound on a cylindrical die to form an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket respectively comprise a plurality of diamond braiding layers and triangular braiding layers axially positioned between the diamond braiding layers, the diamond braiding layers and the triangular braiding layers are alternately wound along diagonal directions, the wires on the triangular braiding layers are not crossed, and one axial ends of the upper bracket and the lower bracket are butted with each other; the triangular braid corresponds to a bending region of the biliary tract.

Further, the upper bracket and the lower bracket form a tubular main body and ports at two axial ends of the tubular main body, the triangular weaving layer is positioned on the tubular main body, and the two ports are of flaring structures.

Further, the triangular braiding layers are arranged in a pairwise and two-phase mode.

Further, the ports and the triangular weaving layers are provided with a plurality of developing rings.

Further, the knitting method of the diamond-shaped knitting layer comprises the following steps: the wire rod is bent in a Z shape along the circumferential direction, and a first bending point is formed at the bending position; the number of the first bending points is odd on the same circumference, and one first bending point is arranged between two first bending points which are sequentially formed along the winding direction.

Further, the knitting method of the triangular knitting layer comprises the following steps: the wire rod is bent in a Z shape along the circumferential direction, and a second bending point is formed at the bending position; on the same circumference, two second bending points sequentially formed along the winding direction are adjacently arranged.

Further, the upper bracket is formed by weaving first wires, and the lower bracket is formed by weaving second wires; the braiding method of the stent comprises the following steps:

s1: the first wire is woven from one axial end of the cylindrical die to form an upper support.

S2: the second wire is woven from the other axial end of the cylindrical die to form a lower bracket and is butted with the tail end of the upper bracket.

S3: the first wire and the second wire continue to be threaded in opposite directions until the ends are closed and knotted.

Further, the weaving method of the lower bracket and the upper bracket is the same; step S1 comprises the steps of:

s11: the first wire is woven into m diamond-shaped woven layers from a first starting point to a first position.

S12: 2-3 triangular braiding layers are braided from a first position to a second position.

S13: and weaving n layers of diamond-shaped weaving layers from the second position to the third position.

S14: knitting 1 triangular knitting layer from the third position to reach the first cut-off point; wherein m and n are positive integers.

Further, the circumferential interval between the first start point and the start point of the second wire in the winding direction of the first wire is 6.

Further, when the first wire is woven to the repeated wiring position of each layer, the first wire is spirally wound and then enters the next layer.

Further, let the axial interval number of the starting point and the ending point of the wire be a, the circumferential interval number be p, and the number of the axial intervals occupied by the triangular weaving unit formed by winding the wire be c, and the total number of the circumferential intervals on the same circumference be b, then the following conditions are satisfied: a-c=b+d+p, p < d, where d is a positive integer.

The invention also provides a bracket which is formed by braiding by using the bracket braiding method.

The beneficial effects of the invention are as follows:

(1) According to the stent braiding method and the stent braided by the method, the diamond braiding layer formed by the Cross braiding mode is combined with the triangular braiding layer formed by the Hook braiding mode, the triangular braiding layer is arranged in the bending area of the biliary tract system, and on the basis of meeting good compliance and bending performance, the bending radial force is smaller, so that the stent braiding method is more suitable for the biliary tract system.

(2) The invention adopts two wires for knitting, the knitting method is simple, and the structural strength is ensured.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is an upward cross-over schematic view of a Hook weave;

FIG. 2 is a schematic view of the Hook braiding crossing downwards;

FIG. 3 is a schematic illustration of the first wire woven with a first layer of diamond woven layers;

FIG. 4 is an enlarged view of FIG. 3 at e;

FIG. 5 is an enlarged view at f in FIG. 3;

FIG. 6 is an enlarged view at g in FIG. 3;

FIG. 7 is a schematic illustration of the first wire woven to the first Hook add-on layer;

FIG. 8 is an enlarged view at h of FIG. 7;

FIG. 9 is a schematic illustration of the first wire woven to a second Hook add-on layer;

FIG. 10 is a schematic view of the upper and lower stents after braiding is completed;

FIG. 11 is an enlarged view at j of FIG. 10;

FIG. 12 is a schematic view of the first and second wires after the first and second wires are terminated and knotted;

FIG. 13 is a front view of a stent according to the present invention

Fig. 14 is a schematic view of the human biliary-pancreatic system.

In the figure, 1, an upper bracket, 2, a lower bracket, 3, a port, 4, a developing ring, 5, a triangular weaving layer, 6, a diamond weaving layer, 7, a first bending point, 8, a Cross intersection point, 9, a second bending point, 10, a first wire, 11, a second wire, 12, a first starting point, 13, a first position, 14, a second position, 15, a third position, 16, a first interception point, 17, a first ending point, 18, a second ending point, 19, a Hook intersection point, 20, a second starting point, 21, a positioning pin, 22, a tubular body, 23 and a first transfer point.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

For convenience of distinction, the present invention uses thin lines for the first wire 10 and thick lines for the second wire 11.

Example 1

The method adopts two wires to wind on a cylindrical die to form an upper bracket 1 and a lower bracket 2 respectively, wherein the upper bracket 1 and the lower bracket 2 respectively comprise a plurality of diamond braiding layers 6 and triangular braiding layers 5 axially positioned between the diamond braiding layers 6, and one axial ends of the upper bracket 1 and the lower bracket 2 are butted with each other, in particular to that the lower end of the upper bracket 1 is butted with the upper end of the lower bracket 2; the triangular braid 5 is located substantially near the middle of the stent as a whole so as to correspond to the bending region of the biliary tract. The diamond-shaped braiding layers 6 and the triangular braiding layers 5 are alternately wound along the diagonal direction, and wires on the triangular braiding layers 5 are not intersected with each other.

The diamond-shaped braiding layers 6 are of diamond-shaped grid structures, the triangular braiding layers 5 are of triangular grid structures, the diamond-shaped grid structures are larger than bending radial force of the triangular grid structures, the triangular grid structures can be recovered radially when being bent, so that the radial force is reduced, the corresponding triangular braiding layers 5 are arranged according to bending areas of a biliary tract system, when the support needs to be placed in the biliary tract system, the triangular braiding layers 5 are positioned at bending positions in the biliary tract system, and accordingly pressure on the bending areas is reduced, and the phenomenon that patients are not adaptive to the bending areas is avoided.

As shown in fig. 12 and 13, the stent comprises a tubular body 22 and ports 3 at both ends of the tubular body 22, the ends of the upper stent 1 and the lower stent 2 respectively form one port 3, and the tubular body 22 is composed of the upper stent 1 and the lower stent 2 together. The triangular braid 5 is located on the tubular body 22 with two ports 3 of flared configuration.

For marking the important parts, it is preferable that the ports 3 and the triangular braid 5 have several developing rings 4 thereon, and fig. 4 illustrates the positions of the developing rings 4 at the ports 3.

The stent is formed by braiding wires on a cylindrical mold provided with removable positioning pins 21 at all points where circumferential parting lines and length parting lines are crossed, respectively, the circumferential parting lines and the length parting lines being set by equally distributing cylinders having the same diameter and length as the stent to be manufactured in the circumferential direction at equal intervals, equally distributing cylinders in the length direction at unequal intervals, or distributing cylinders in the length direction at unequal intervals; starting from any one of the reference position points as a starting point, the wire is alternately bent up and down in the diagonal direction by the positioning pins 21 to form a web.

The diamond-shaped braiding layer 6 is formed by adopting a conventional Cross braiding mode, and the specific braiding method is as follows: the wire rod is bent in a Z shape along the circumferential direction, and a first bending point 7 is formed at the bending position; the number of first bending points 7 is odd on the same circumference, and one first bending point 7 is arranged between two first bending points 7 which are sequentially formed along the winding direction. As shown in fig. 7, on the circumference of the third length dividing line, two first bending points 7 formed sequentially along the winding direction of the wire are respectively a point a and a point B, a point D is further provided between the points a and B, the first bending point 7 (point D) is formed by the subsequent winding, and a Cross intersection point 8 is formed between the second length dividing line and the third length dividing line, and in addition, when the number of the first bending points 7 on the same circumference is an even number, a single cycle winding is caused, and the Cross intersection point 8 cannot be formed by alternate winding, so the number of the first bending points 7 on the same circumference can only be an odd number.

The triangular braiding layer 5 is formed by adopting a conventional Hook braiding mode, and the specific braiding method is as follows: the wire is bent in a Z shape along the circumferential direction, and a second bending point 9 is formed at the bending position; on the same circumference, two second bending points 9 formed in sequence in the winding direction are adjacently arranged. As shown in fig. 7, on the adjacent two circumferences, the positioning pins 21 are arranged in a staggered manner, the wire is wound up and down in order, and on the circumference of the thirteenth length dividing line, two second bending points 9 formed in order along the winding direction of the wire are respectively a point E and a point F, and the point E and the point F are adjacent.

In this embodiment, the upper bracket 1 is formed by braiding a first wire 10, and the lower bracket 2 is formed by braiding a second wire 11; the braiding method of the stent comprises the following steps:

s1: the first wire 10 is woven from one axial end of the cylindrical die to form the upper bracket 1.

S2: the second wire 11 is woven from the other axial end of the cylindrical die to form the lower bracket 2, and is butted with the end of the upper bracket 1.

S3: the first wire 10 and the second wire 11 continue threading in the opposite direction to the end-ending knot.

The upper bracket 1 and the lower bracket 2 occupy half of the area of the bracket respectively, the winding modes of the first wire 10 and the second wire 11 are the same, and after the winding of the upper bracket 1 and the lower bracket 2 is completed, the first wire 10 and the second wire 11 are threaded to the end part along the spiral line along the winding lines of the upper bracket 1 and the lower bracket 2.

The leading and trailing ends of the first and

second wires

10 and 11 are knotted with a length of about 200 mm.

In an alternative embodiment, the lower bracket 2 is woven by the same method as the upper bracket 1, and the winding manner of the upper bracket 1 is specifically described by taking the upper bracket 1 as an example, and the step S1 includes the following steps:

s11: the first wire 10 starts braiding m diamond braid 6 from a first start point 12 to a first position 13 ready to go to the next layer.

S12: 2-3 triangular braid 5 is braided from first location 13 to second location 14, forming a first Hook add-on layer and ready to go to the next layer.

S13: from the second position 14, the n diamond braid 6 is woven to a third position 15 ready to go to the next layer.

S14: knitting 1 triangular knit layer 5 from a third location 15 to a first cut-off 16 to form a second Hook add-on layer; wherein m and n are positive integers. At this time, the upper bracket 1 is partially braided, and the remaining first wire 10 is threaded down to the end after the lower bracket 2 is braided.

The lower bracket 2 has the same structure as the upper bracket 1, and the second Hook adding layer of the upper bracket 1 is in butt joint with the Hook adding layer of the lower bracket 2, so that three Hook adding layers are formed in the whole bracket, in the embodiment, m=10, n=8, each Hook adding layer is two triangular braiding layers 5, when the positioning pins 21 are removed, the Hook adding layers form a diamond, and the difference between the diamond braiding layers 6 is that, as shown in fig. 7, the intersection point of the diamond braiding layers 6 is a Cross intersection point 8, no positioning pin 21 is arranged at the Cross intersection point 8, and the intersection point of the Hook adding layers is a Hook intersection point which is provided with the positioning pins 21.

The ending point of the wire can be calculated to judge whether the braiding is wrong. Let the axial interval number of the starting point and the ending point of the wire rod be a, the circumferential interval number be p, the axial interval number c occupied by the triangular weaving unit formed by winding the wire rod be b, the following conditions are satisfied: a-c=b+d+p, p < d, where d is a positive integer. In this embodiment, a=42, b=13, and c=3, then p=0 may be obtained according to the operation formula, that is, the starting point and ending point of the wire rod are located on the same circumferential separation line.

The knitting process is specifically described below:

the circumferential parting line and the length parting line on the cylindrical die are sequentially marked with serial numbers according to Arabic numbers, a first starting point 12 is fixed on a fifth circumferential parting line (shown in figure 3), a first wire 10 is sequentially bent and wound along the diagonal direction from the first starting point 12 until the first starting point 12 is returned, after the wire is spirally wound at the repeated wiring position between the first starting point 12 and the first switching point 23, the wire enters the next layer of diamond-shaped weaving layer 6 through a positioning pin 21 at the first switching point 23 (each layer enters the next layer in the same spiral winding mode, a winding mode diagram is shown in figure 8), a ten-layer diamond-shaped weaving layer 6 is formed by analogy until the first position 13, two layers of triangular weaving layers 5 are formed between the eleventh length parting line and the thirteenth length parting line through the staggered arrangement of the positioning pin 21 in the circumferential direction, then eight layers of diamond-shaped weaving layers 6 are continuously woven downwards through the second position 14, and finally one layer of triangular weaving layers 5 are woven (shown in figures 7 and 9). Next, a second starting point 20 is set on an eleventh circumferential separation line at the other end of the cylindrical mold, and the second starting point 20 of the second wire 11 is woven in the same manner as the first wire 10 until the upper bracket 1 is butted, and fig. 11 is a schematic view showing the butted position. Finally, the first wire 10 and the second wire 11 are threaded in opposite directions until the ends are knotted, the ending position of the first wire 10 is located at a first ending point 17 at the lower end and is located on a fifth circumferential separation line, and the ending position of the second wire 11 is located at a second ending point 18 at the upper end and is located on an eleventh circumferential separation line, as shown in fig. 12. To facilitate the observation of the repeated routing portions of the different wires, the upper and

lower brackets

1 and 2 in fig. 12 are each indicated by a thin line (not woven with the first wire 10 on behalf of the lower bracket 12), and only the repeated routing portions distinguish the first wire 10 from the second wire 11 by the thickness of the line.

In this embodiment, the height of each diamond-shaped braid 6 is equal to the sum of the heights of the two triangular braids 5, and after the cylindrical mold is removed, the tubular body of the stent has a uniform diamond-shaped structure in appearance.

On the same diamond-shaped woven layer 6, cross intersections 8 are alternately distributed up and down, cross upward crossing means that the later wound wire is located outside the earlier wound wire, fig. 5 is a Cross upward crossing schematic diagram, fig. 6 is a Cross downward crossing schematic diagram, in which broken lines are the earlier wound wire, and solid lines are the later wound wire. The Hook intersection 19 preferably crosses downwards (as shown in fig. 2), the Hook crosses downwards, that is, the wire wound later passes out from the wire wound earlier from inside to outside, fig. 2 is a schematic view of Hook crossing downwards, and fig. 1 is a schematic view of Hook crossing upwards.

Example two

A stent woven using the stent weaving method described above.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In this specification, a schematic representation of the terms does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments.

With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims

1. A method for braiding a stent, which is characterized in that: the method comprises the steps that two wires are respectively wound on a cylindrical die to form an upper bracket and a lower bracket, each of the upper bracket and the lower bracket comprises a plurality of diamond-shaped braiding layers and triangular braiding layers axially positioned between the diamond-shaped braiding layers, the diamond-shaped braiding layers and the triangular braiding layers are alternately wound along diagonal directions, and the wires on the triangular braiding layers are not crossed with each other; one axial ends of the upper bracket and the lower bracket are mutually butted; the triangular braid corresponds to a bending region of the biliary tract.

2. The stent braiding method of claim 1, wherein: the upper bracket and the lower bracket form a tubular main body and ports at two axial ends of the tubular main body, the triangular weaving layer is positioned on the tubular main body, and the two ports are flaring structures.

3. The stent braiding method of claim 1, wherein: the triangular braiding layers are arranged in a pairwise and two-phase mode.

4. The stent braiding method of claim 1, wherein: the knitting method of the diamond-shaped knitting layer comprises the following steps: the wire rod is bent in a Z shape along the circumferential direction, and a first bending point is formed at the bending position; the number of the first bending points is odd on the same circumference, and one first bending point is arranged between two first bending points which are sequentially formed along the winding direction.

5. The stent braiding method of claim 4, wherein: the knitting method of the triangular knitting layer comprises the following steps: the wire rod is bent in a Z shape along the circumferential direction, and a second bending point is formed at the bending position; on the same circumference, two second bending points sequentially formed along the winding direction are adjacently arranged.

6. The stent braiding method of claim 5, wherein: the upper bracket is formed by weaving first wires, and the lower bracket is formed by weaving second wires; the braiding method of the stent comprises the following steps:

s1: the first wire is woven from one axial end of the cylindrical die to form an upper bracket;

s2: the second wire is woven from the other axial end of the cylindrical die to form a lower bracket and is in butt joint with the tail end of the upper bracket;

7. The stent braiding method of claim 6, wherein: the weaving method of the lower bracket and the upper bracket is the same;

step S1 comprises the steps of:

s11: the first wire starts to weave m layers of diamond-shaped weaving layers from a first starting point and reaches a first position;

s12: 2-3 layers of triangular braiding layers are braided from a first position to a second position;

s13: weaving n layers of diamond-shaped weaving layers from the second position to a third position;

s14: knitting 1 triangular knitting layer from the third position to reach the first cut-off point;

wherein m and n are positive integers.

8. The stent braiding method of claim 7, wherein: let the axial interval number of the starting point and the ending point of the wire rod be a, the circumferential interval number be p, the axial interval number c occupied by the triangular weaving unit formed by winding the wire rod be b, the following conditions are satisfied: a-c=b+d+p, p < d, where d is a positive integer.

9. The stent braiding method of claim 7, wherein: when the first wire is woven to the repeated wiring position of each layer, the first wire enters the next layer after being spirally wound.

10. A stent, characterized in that: the stent is woven using the stent weaving method of any one of claims 1-9.