A columnar rod core, a braiding method of a bracket and a bracket thereof

Abstract

The present invention provides a method for weaving a columnar rod core and a bracket and the bracket thereof, comprising: a rod body, holes and positioning pins distributed in rows and columns at the intersection of the length dividing line and the circumference dividing line of the rod body, wherein the length dividing line is arranged along the length direction of the rod body, and the circumference dividing line is arranged along the circumference direction of the rod body; the positioning pins are arranged in the holes, and the positioning pins are higher than the circumferential outer surface of the rod body; the wire material takes any one of the positioning pins as a starting point, and then wraps around the top of the positioning pin and then wraps around the bottom of the positioning pin in the next row and column, and reciprocates up and down in a Z-shaped manner along the circumference direction of the rod body to bend around the positioning pin, and weaves down layer by layer to form the bracket. The bracket of the present invention is simple to weave, has a small shortening rate and good flexibility.

Description

Technical Field

[0001] The invention relates to the technical field of medical stents, and in particular to a columnar rod core, a stent weaving method and the stent. Background Art

[0002] In the medical field, stents have been widely used to implant in human cavities such as blood vessels, bile ducts, and trachea to maintain, open, or expand the cavities. In order to facilitate implantation and release in the human body, stents usually have to have good expansion performance. And because most of the parts where stents need to be implanted are relatively curved, in order to reduce the damage to the human body caused by stent breakage, there are also high requirements for the flexibility of the stent.

[0003] Currently, there are two main methods for stents: laser engraving using nickel-titanium alloy tubes and braiding using nickel-titanium alloy wires. Although laser engraving is convenient and fast, the stents produced using this method are usually not flexible, not easy to bend, and prone to fatigue fracture.

[0004] However, due to its special structural unit, the woven stent can be folded and expanded, has better flexibility, and is more suitable for curved human lumens. However, the production of woven stents is usually more complicated. Usually, the upper stent needs to be woven from top to bottom and then the lower stent needs to be woven from bottom to top on the basis of the upper stent. In addition, since it is easily stretched horizontally during use, the length will become shorter after being released in the human body. Therefore, if the shortening rate of the stent is too large, it is not easy to assemble and position. Summary of the invention

[0005] The present invention provides a method for weaving a columnar rod core and a bracket thereof, aiming to solve the problems that the existing bracket is troublesome to weave and the shortening rate is too large, which makes it difficult to assemble and position.

[0006] In the first aspect, an embodiment of the present invention provides a cylindrical rod core for weaving wires to form a stent, comprising: a rod body, holes distributed in rows and columns at the intersection of the length dividing line and the circumferential dividing line of the rod body, and positioning pins, the length dividing line is arranged along the length direction of the rod body, and the circumferential dividing line is arranged along the circumferential direction of the rod body; the positioning pins are arranged in the holes, and the positioning pins are higher than the circumferential outer surface of the rod body; the wire takes any one of the positioning pins as a starting point, bypasses the top of the positioning pin and then wraps around the bottom of the positioning pin in the next row and column, and reciprocates up and down in a Z-shape along the circumferential direction of the rod body to bypass the positioning pins and bend, and is woven downward layer by layer to form the stent.

[0007] Preferably, the wires are cross-woven on the surface of the rod to form a woven mesh with a diamond structure, and the upper and lower layers of the diamond structure are cross-interlocked.

[0008] Preferably, the length dividing line is a ring shape that goes around the circumference of the rod body, and the circumferential dividing line is a straight line along the length direction of the rod body.

[0009] Preferably, the number of the circumferential dividing lines is 2X, wherein X is the number of crests or troughs on each row of the stent, and the length dividing lines and the circumferential dividing lines are set by distributing the length and circumference of the columnar rod core at equal intervals.

[0010] Preferably, the number of the positioning pins in each layer on the rod body is equal, and the positions of the positioning pins in adjacent rows are staggered.

[0011] In a second aspect, an embodiment of the present invention provides a braiding method for a stent, the braiding method is implemented based on the above-mentioned columnar rod core, and the braiding method comprises the following steps:

[0012] Step S1, using any positioning pin in the second row corresponding to any end of the columnar rod core as the starting first reference positioning pin, allowing the wire to be introduced from above the first reference positioning pin and then led out obliquely upward from its bottom, using the first row positioning pin obliquely above the first reference positioning pin as the second reference positioning pin for winding, allowing the wire to be led out obliquely downward from the top of the second reference positioning pin, and then winding around the second row positioning pin obliquely below the second reference positioning pin and leading out obliquely upward from the bottom; subsequently, allowing the wire to be Z-shaped between the first row positioning pin and the second row positioning pin and repeating step S1 up and down until there is no corresponding positioning pin that needs to be bypassed at the second row positioning pin, and this positioning pin is used as the third reference positioning pin;

[0013] Step S2, after the wire is led out obliquely downward at the top of the third reference positioning pin and rewound back to the top of the first reference positioning pin, the wire is bypassed by the top of the first reference positioning pin and is wound obliquely downward to the third row of positioning pins, and the third row of positioning pins is used as the fourth reference positioning pin, the wire is returned obliquely upward from the bottom of the fourth reference positioning pin to the second row of positioning pins for winding, and the second row of positioning pins is used as the fifth reference positioning pin, the wire is bypassed by the fifth reference positioning pin from the bottom of the fourth reference positioning pin and is cross-wound with the wire already on the fifth reference positioning pin, so that after the wire is cross-wound, it is led out obliquely downward at the top of the fifth reference positioning pin to the third row of positioning pins;

[0014] Step S3, making the wire material repeat step S1 up and down in a Z-shape between the second row of positioning pins and the third row of positioning pins to weave until there is no corresponding positioning pin that needs to be bypassed on the third row of positioning pins, that is, the fourth reference positioning pin, and then making the wire material repeat step S2 to change rows and turn to weave, and when the wire material bypasses the second row of positioning pins, it needs to cross-wind with the existing wire material on the second row of positioning pins to form an upper and lower interlocking structure;

[0015] Step S4, weaving the wire material downward along the length direction of the columnar rod core according to the winding method of step S1 to step S3, extending the length of the braided bracket, and after the bracket is woven to the required length, using the last row of positioning pins that do not need to be bypassed as the termination positioning pins, so that the wire material is wound around the termination positioning pins for one round and then the wire material is led out;

[0016] Step S5, removing all positioning pins on the columnar rod core to obtain a woven bracket.

[0017] Preferably, in step S3, the weaving direction of the wire between the second row of positioning pins and the third row of positioning pins is opposite to the weaving direction between the first row of positioning pins and the second row of positioning pins, and the weaving direction of the wire between any two rows of positioning pins in the subsequent weaving process is opposite.

[0018] Preferably, in step S3, when the wire is hooked back and cross-wound on the first reference positioning pin, the wire needs to be hooked back and crossed under the two existing wires between the first reference positioning pin and the third reference positioning pin, and hooked out from above the existing wire between the fourth reference positioning pin and the fifth reference positioning pin.

[0019] Preferably, in step S5, the braided stent needs to be heat treated and shaped before the positioning pins on the columnar rod core are removed, and the remaining wires need to be trimmed.

[0020] In a third aspect, an embodiment of the present invention provides a stent, wherein the stent is manufactured based on the above-mentioned stent weaving method, and the wire is a tough wire.

[0021] Compared with the prior art, the beneficial effect of the present invention lies in that the wire is taken as a starting point from any positioning pin, and is wound around the top of the positioning pin and then around the bottom of the positioning pin in the next row and column, and is bent around the positioning pin in a Z shape along the circumferential direction of the rod body, and is woven downward layer by layer to form a stent; the wire is wound up and down in a "Z" shape between the positioning pins on the surface of the columnar rod core, and the wires are cross-wound to form an interlocking diamond structure; at the same time, the stent weaving method of the present invention only needs to weave from top to bottom, which greatly reduces the difficulty of weaving the stent, and compared with other weaving methods, the weaving line change requires more than two rows, and the method of the present invention only requires one row, so the stent woven by the present invention also has a lower shortening rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0023] Figure 1It is a schematic diagram of the planar unfolded structure of the cylindrical rod core when the positioning pin is not installed in the first embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the columnar rod core when the positioning pin is not installed in the first embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the planar unfolding structure of the cylindrical rod core when the positioning pin is assembled in the first embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the columnar rod core when the positioning pin is assembled in the first embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the expansion of the weaving process of step S1 of the second embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the knitting process of step S2 in the second embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of the expansion of the weaving process of step S3 of the second embodiment of the present invention;

[0030] Figure 8 It is a schematic diagram of the expansion of the weaving process of step S4 of the second embodiment of the present invention;

[0031] Fig. 9 For the present invention Figure 7 Enlarge the flow chart at M1 in the middle;

[0032] Fig.10 For the present invention Figure 7 Enlarge the flow chart at M2 in the middle;

[0033] Fig.11 For the present invention Figure 8 Enlarge the flow chart at M3;

[0034] Fig.12 For the present invention Figure 8 Enlarge the flow chart at M4;

[0035] Fig.13 Schematic diagram of the knitting process in step S3 of the third embodiment of the present invention;

[0036] Fig.14 Schematic diagram of the knitting process in step S3 of the fourth embodiment of the present invention;

[0037] Fig.15 This is an overall flow chart of the braiding method of the stent provided in an embodiment of the present invention.

[0038] Among them, 200, columnar rod core, 201, hole, 202, positioning pin, 203, rod body, 300, wire, 100, bracket. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] First embodiment

[0041] Combined with Figure 1-Figure 4 As shown, an embodiment of the present invention provides a cylindrical rod core 200 for weaving wires 300 to form a bracket 100, including: a rod body 203, holes 201 distributed in rows and columns at the intersection of the length dividing line and the circumferential dividing line of the rod body 203, and a positioning pin 202, wherein the length dividing line is arranged along the length direction of the rod body 203, and the circumferential dividing line is arranged along the circumferential direction of the rod body 203; the positioning pin 202 is arranged in the hole 201, and the positioning pin 202 is higher than the circumferential outer surface of the rod body 203; the wire 300 takes any one of the positioning pins 202 as a starting point, bypasses the top of the positioning pin 202, and then wraps around the bottom of the positioning pin 202 in the next row and column, and reciprocates up and down in a Z-shape along the circumferential direction of the rod body 203 to bypass the positioning pin 202 and bend, and is woven downward layer by layer to form the bracket 100.

[0042] Among them, the columnar rod core 200 is as follows Figure 1 and Figure 2 As shown, in each embodiment, the shape and size parameters of the columnar rod core are designed according to the requirements of the stent, including but not limited to various cylinders that can be configured as a core rod, such as a cylinder, an elliptical cylinder, and a polygonal prism. In most cases, a cylindrical columnar rod core 200 will be selected. The present invention is exemplarily described below by taking the cylindrical columnar rod core 200 as an example.

[0043] Specifically, one end of the positioning pin 202 can be detachably assembled in the hole 201, and the other end is a free end extending in a direction away from the outer surface of the columnar rod core 200, wherein the matching mode of the positioning pin 202 and the hole 201 can be a transition fit, an interference fit, or a clearance fit. The number of rows of the positioning pins 202 is designed according to the required length of the bracket. For the sake of clarity, Figure 3The white circle in the figure represents the hole 201, and the black circle represents the positioning pin 202. Taking any positioning pin 202 as the starting point, the wire 300 is wound around the top of the positioning pin 202 and then around the bottom of the positioning pin 202 in the next row and column, and is reciprocated up and down in a "Z" shape along the circumference of the columnar rod core 200, and is bent around the positioning pin 202, and is woven down layer by layer. The wire 300 is cross-woven on the surface of the columnar rod core 200 to form a diamond-shaped woven mesh, and the upper and lower layers of diamonds are cross-interlocked.

[0044] In this embodiment, the wires 300 are cross-woven on the surface of the rod 203 to form a woven mesh with a diamond structure, and the upper and lower layers of the diamond structure are cross-interlocked.

[0045] In this embodiment, the length dividing line is a ring that goes around the circumference of the rod body 203, and the circumferential dividing line is a straight line along the length direction of the rod body 203. The length dividing lines are arranged equidistantly or unequally along the length direction of the columnar rod core 200, and the circumferential dividing lines are arranged equidistantly or unequally along the circumferential direction of the columnar rod core 200.

[0046] In this embodiment, the number of the circumferential dividing lines is 2X, where X is the number of crests or troughs on each row of the stent 100 , and the length dividing lines and the circumferential dividing lines are set by distributing the length and circumference of the columnar rod core 200 at equal intervals.

[0047] In some embodiments, the diameter of the columnar rod core 200 is the inner diameter of the stent 100 to be manufactured, and there are holes 201 distributed in rows and columns at the intersection of the length dividing line and the circumference dividing line of the columnar rod core 200. The holes 201 can be provided with positioning pins 202 that are higher than the outer surface of the circumference of the columnar rod core 200. The number of circumference dividing lines is 2X, where X is the number of crests or troughs on each row of the stent, and the length dividing lines and circumference dividing lines are set by distributing the length and circumference of the columnar rod core 200 at equal intervals. Specifically, the number of circumference dividing lines is twice the number of crests or troughs on each row of the stent 100, that is, twice the number of support units on each row of the stent 100, and generally, X≥3.

[0048] In this embodiment, the number of the positioning pins 202 in each layer of the rod body 203 is equal, and the positions of the positioning pins 202 in adjacent rows are staggered. Figure 3 Not every hole 201 is provided with a locating pin 202. There is a hole between each row of locating pins 202. If there are 12 holes 201 in each row, 6 locating pins 202 are arranged, and the positions of any two rows of locating pins 202 are staggered, that is, in the holes 201 in the same column or on the same circular dividing line, if the previous row is provided with a locating pin 202, the next row is not provided with a locating pin 202.

[0049] Second embodiment

[0050] Combined with Figure 1-Figure 15 As shown, an embodiment of the present invention provides a braiding method for a stent 100, the braiding method is implemented based on the above-mentioned columnar rod core 200, and the braiding method includes the following steps:

[0051] Step S1, using any positioning pin 202 in the second row corresponding to any end of the columnar rod core 200 as the starting first reference positioning pin 202, so that the wire 300 is introduced from above the first reference positioning pin 202 and then led out obliquely upward from its bottom, and the first row positioning pin 202 obliquely above the first reference positioning pin 202 is used as the second reference positioning pin 202 for winding, so that the wire 300 is led out obliquely downward from the top of the second reference positioning pin 202, and then wound around the second row positioning pin 202 obliquely below the second reference positioning pin 202 and led out obliquely upward from the bottom; subsequently, the wire 300 is made to repeat step S1 in a Z-shape up and down between the first row positioning pin 202 and the second row positioning pin 202 until the wire 300 has no corresponding positioning pin 202 that needs to be bypassed in the second row positioning pin 202 and this positioning pin 202 is used as the third reference positioning pin 202.

[0052] Specifically, any positioning pin 202 in the second row corresponding to any end of the columnar rod core 200 is used as the starting first reference positioning pin 202 (x3 / y2), and the wire 300 is introduced from above the first reference positioning pin 202 (x3 / y2) and then led out obliquely upward from its bottom. The first row positioning pin 202 obliquely above the first reference positioning pin 202 (x3 / y2) is used as the second reference positioning pin 202 (x4 / y1) for winding, and the wire 300 is led out obliquely downward from the top of the second reference positioning pin 202 (x4 / y1), and then is wound around the second row positioning pin 202 (x5 / y2) obliquely below the second reference positioning pin 202 (x4 / y1) and led out obliquely upward from the bottom. Subsequently, the wire 300 is moved back and forth in a "Z" shape between the first row of positioning pins 202 and the second row of positioning pins 202, and step S1 is repeated until the wire 300 has no corresponding positioning pin that needs to be bypassed in the second row of positioning pins, and this positioning pin is used as the third reference positioning pin 202 (x2 / y1). Specifically, refer to Figure 5 , the winding path of the wire 300 passes through the positioning pins (x3 / y2), (x4 / y1), (x5 / y2), (x6 / y1), (x7 / y2), (x8 / y1), (x9 / y2), (x10 / y1), (x11 / y2), (x12 / y1), (x1 / y2) and (x2 / y1) in sequence. At this time, the winding trajectory of the wire 300 between the first row of positioning pins and the second row of positioning pins is similar to the shape of a sine curve.

[0053] Step S2, after the wire 300 is led out obliquely downward at the top of the third reference positioning pin 202 and rewound back to the top of the first reference positioning pin 202, the wire 300 is bypassed around the top of the first reference positioning pin 202 and is wound obliquely downward toward the third row of positioning pins 202 and the third row of positioning pins 202 is used as the fourth reference positioning pin 202, the wire 300 is returned obliquely upward from the bottom of the fourth reference positioning pin 202 to the second row of positioning pins 202 for winding, and the second row of positioning pins 202 is used as the fifth reference positioning pin 202, the wire 300 is bypassed obliquely upward from the bottom of the fourth reference positioning pin 202 by the fifth reference positioning pin 202 and is cross-wound with the wire 300 already on the fifth reference positioning pin 202, and the wire 300 is cross-wound and led out obliquely downward at the top of the fifth reference positioning pin 202 to the third row of positioning pins 202.

[0054] Specifically, the wire 300 is led out obliquely downward at the top of the third reference positioning pin 202 (x2 / y1) and rewound back to the top of the first reference positioning pin 202 (x3 / y2), and then the wire 300 is wound around the top of the first reference positioning pin 202 (x3 / y2) and obliquely downward to the third row of positioning pins 202 and the third row of positioning pins 202 are used as the fourth reference positioning pins 202 (x2 / y3), and the wire 300 is returned obliquely upward from the bottom of the fourth reference positioning pin 202 (x2 / y3) to the second The second row of positioning pins 202 is wound around the fifth reference positioning pins 202 (x1 / y2), and the second row of positioning pins is used as the fifth reference positioning pins 202 (x1 / y2), so that the wire material is wound around the fifth reference positioning pins 202 (x1 / y2) from the bottom of the fourth reference positioning pins 202 (x2 / y3) and cross-wound with the wire material 300 already on the fifth reference positioning pins 202 (x1 / y2), so that the wire material 300 is cross-wound and led out from the top of the fifth reference positioning pins 202 (x1 / y2) to the third row of positioning pins 202. Specifically, refer to Figure 6 The winding path of the wire 300 passes through the positioning pins (x2 / y1), (x3 / y2), (x2 / y3) and (x1 / y2) in sequence. Through the process of step S2, the wire 300 can be changed from being woven between the first row of positioning pins and the second row of positioning pins 202 to being woven between the second row and the third row of positioning pins 202.

[0055] Step S3, making the wire 300 repeat step S1 back and forth up and down in a Z-shape between the second row of positioning pins 202 and the third row of positioning pins 202 to weave until there is no corresponding positioning pin 202 that needs to be bypassed in the third row of positioning pins 202, i.e., the fourth reference positioning pin 202, and then making the wire 300 repeat step S2 to change rows and turn to weave, and when the wire 300 bypasses the second row of positioning pins 202, it needs to be cross-wound with the existing wire 300 on the second row of positioning pins 202 to form an upper and lower interlocking structure.

[0056] Specifically, the wire 300 is woven in a "Z" shape between the second row of positioning pins 202 and the third row of positioning pins 202 by repeating step S1 up and down until the wire 300 has no corresponding positioning pin that needs to be bypassed on the third row of positioning pins 202, namely, the fourth reference positioning pin (x2 / y3), and then the wire 300 repeats step S2 to change rows and turn to weave, and when the wire bypasses the second row of positioning pins, it needs to be hooked back and crossed with the existing wire on the second row of positioning pins to form an upper and lower interlocking structure. Specifically, refer to Figure 7 , the winding path of the wire 300 passes through the positioning pins (x1 / y2), (x12 / y3), (x11 / y2), (x10 / y3), (x9 / y2), (x8 / y3), (x7 / y2), (x6 / y3), (x5 / y2), (x4 / y3), (x3 / y2), (x2 / y3), (x3 / y4) and (x4 / y3) in sequence. At this time, the winding trajectory of the wire 300 between the second row of positioning pins 202 and the third row of positioning pins 202 is also similar to the shape of a sine curve. The upper and lower interlocking structure here means that the peak position of the sinusoidal curve trajectory between the second row of locating pins and the third row of locating pins is on the same vertical line as the trough position of the sinusoidal curve trajectory between the first row of locating pins 202 and the second row of locating pins 202, and the wire 300 at the peak position between the second row of locating pins 202 and the third row of locating pins 202 must be placed on the wire 300 at the trough position between the first row of locating pins 202 and the second row of locating pins 202, so as to connect the two layers of sinusoidal curve wire 300.

[0057] Step S4, weave the wire 300 continuously downward along the length direction of the cylindrical rod core 200 according to the winding method of steps S1 to S3, extend the length of the braided bracket 100, and after the bracket 100 is woven to the required length, use the last row of positioning pins 202 that have no corresponding need to be bypassed as the termination positioning pin 202, so that the wire 300 is wound around the termination positioning pin 202 for one circle and then the wire 300 is led out.

[0058] Specifically, the wire 300 is woven downward along the length direction of the columnar rod core 200 in accordance with the winding method of step S1, step S2 and step S3 to extend the length of the woven stent. After the stent is woven to the required length, the last row of positioning pins that do not need to be bypassed is used as the termination positioning pin 202 (x3 / y12), and the wire 300 is wound around the termination positioning pin 202 (x3 / y12) for one round before being led out. Specifically, refer to Figure 8 , Figure 8 This is a plan view of the bracket 100 after it is woven. The bracket 100 is formed by closely arranged rhombuses of similar shapes, and except for the rhombus edges on the second and third columns of positioning pins which are composed of two wires 300, the remaining rhombus edges are all composed of one wire 300.

[0059] Step S5: remove all the positioning pins 202 on the columnar rod core 200 to obtain the braided stent 100. The stent 100 can be easily bent and stretched in the horizontal and vertical directions, and has good flexibility.

[0060] Specifically, the above-mentioned stent weaving method only needs to weave from top to bottom, which greatly reduces the difficulty of weaving the stent. Compared with other weaving methods, the weaving line needs to be separated by more than two rows, while the method of the present invention only needs to be separated by one row. Therefore, the stent 100 woven by the present invention also has a lower shortening rate.

[0061] In some embodiments, in step S2, the wire 300 is wound around the first reference positioning pin 202 (x3 / y2), the third reference positioning pin 202 (x2 / y1), the fourth reference positioning pin 202 (x2 / y3) and the fifth reference positioning pin 202 (x1 / y2) to form a rhombus. Specifically, the third reference positioning pin 202 (x2 / y1) and the fourth reference positioning pin 202 (x2 / y3) are the upper and lower diagonals of the rhombus, and the fifth reference positioning pin 202 (x1 / y2) and the first reference positioning pin 202 (x3 / y2) are the left and right diagonals of the rhombus.

[0062] In this embodiment, in step S3, the weaving direction of the wire 300 between the second row of positioning pins 202 and the third row of positioning pins 202 is opposite to the weaving direction between the first row of positioning pins 202 and the second row of positioning pins 202, and the weaving direction of the wire 300 between any two rows of positioning pins 202 in the subsequent weaving process is opposite.

[0063] Specifically, the weaving direction of the wire 300 between the second row of positioning pins 202 and the third row of positioning pins 202 is opposite to the weaving direction between the first row of positioning pins 202 and the second row of positioning pins 202, and the weaving direction of the wire 300 between any two rows of positioning pins in the subsequent weaving process is opposite. Specifically, if the weaving direction of the wire 300 between the first row of positioning pins 202 and the second row of positioning pins 202 is from left to right, that is, counterclockwise downward on the outer surface of the columnar rod core 200, then the weaving direction of the wire 300 between the second row of positioning pins 202 and the third row of positioning pins 202 is from right to left, that is, clockwise downward on the outer surface of the columnar core rod 200, and in the subsequent weaving process, the weaving direction between any two rows of positioning pins 202 is opposite to the weaving direction between the upper two rows of positioning pins 202.

[0064] In this embodiment, in step S3, when the wire 300 is hooked back and cross-wound on the first reference positioning pin 202, the wire 300 needs to be hooked back and crossed under the two existing wires 300 between the first reference positioning pin 202 and the third reference positioning pin 202, and hooked out from above the existing wire 300 between the fourth reference positioning pin 202 and the fifth reference positioning pin 202.

[0065] Specifically, when the wire 300 is hooked back and crossed on the first reference positioning pin 202 (x3 / y2), it is necessary to hook the wire back and cross it under the two existing wires between the first reference positioning pin 202 (x3 / y2) and the third reference positioning pin 202 (x2 / y1), and hook it out from above the existing wire between the fourth reference positioning pin 202 (x2 / y3) and the fifth reference positioning pin 202 (x1 / y2). Simply put, it can be woven according to the formula "one up, two down, one up". Specifically, refer to Fig. 9 , Fig. 9 This is a partial enlarged view of the bracket 100. In order to make the "L" wires 300 with the opening upward and the opening downward cross each other, the wires 300 need to be first placed above the wires 300 between the positioning pins 202 (x3 / y2) and the positioning pins 202 (x4 / y1) in the second row, and then hooked below the wires 300 between the first reference positioning pin 202 (x3 / y2) and the third reference positioning pin 202 (x2 / y1); in order to make the "L" wires 300 with the opening to the left and the opening downward cross each other, the wires 300 need to be placed above the wires between the first reference positioning pin 202 (x3 / y2) and the fourth reference positioning pin 202 (x2 / y3). Through the above steps, the three "L"-shaped wires 300 on the first reference positioning pin 202 (x3 / y2) can be crossed and wound together.

[0066] In this embodiment, in step S5, the braided stent 100 needs to be heat-treated and shaped before the positioning pin 202 on the columnar rod core 200 is removed, and the remaining wires 300 need to be trimmed. Specifically, the heat treatment and shaping can use processes such as annealing, and the trimming of the wires 300 requires cutting off the excess wires and then welding them.

[0067] The embodiment of the present invention provides a stent 100, which is made based on the braiding method of the stent 100 of the second embodiment, and the wire 300 is a tough wire 300. Specifically, the wire 300 can be a wire made of metal material or a wire made of titanium alloy material with superelasticity and memory function.

[0068] Third embodiment

[0069] This embodiment provides a stent weaving method, which is the same as the second embodiment. The difference is:

[0070] In step S3, when the wire 300 is back-hooked and cross-wound on the first reference positioning pin 202 (x3 / y2), it is necessary to first wrap the wire under the wire between the first reference positioning pin 202 (x3 / y2) and the second reference positioning pin 202 (x4 / y1), and then simultaneously put the wire on the two existing wires between the first reference positioning pin 202 (x3 / y2) and the third reference positioning pin 202 (x2 / y1), and finally hook it out from under the existing wire between the fourth reference positioning pin 202 (x2 / y3) and the fifth reference positioning pin 202 (x1 / y2). Simply put, it can be woven according to the formula "one, two, one". Specifically, refer to Fig.13 , Fig.13 The flowchart of this step is shown in Figure 2.

[0071] Fourth embodiment

[0072] This embodiment provides a stent weaving method, which is the same as the second embodiment. The difference is:

[0073] In step S3, when the wire 300 is hooked back and cross-wound on the first reference positioning pin 202 (x3 / y2), it is necessary to first put the wire on the wire between the first reference positioning pin 202 (x3 / y2) and the second reference positioning pin 202 (x4 / y1) and the wire on the right between the first reference positioning pin 202 (x3 / y2) and the third reference positioning pin 202 (x2 / y1), and then wrap the wire under the wire on the left between the first reference positioning pin 202 (x3 / y2) and the third reference positioning pin 202 (x2 / y1), and finally hook the wire from above the existing wire between the fourth reference positioning pin 202 (x2 / y3) and the fifth reference positioning pin 202 (x1 / y2). Simply put, it can be woven according to the formula "two up, one down, one up". Specifically, refer to Fig.14 , Fig.14 The flowchart of this step is shown in Figure 2.

[0074] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of more restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, article or device including the element.

[0075] The embodiments of the present invention are described above in conjunction with the accompanying drawings. What is disclosed is only the preferred embodiment of the present invention. However, the present invention is not limited to the above-mentioned specific implementation manner. The above-mentioned specific implementation manner is only illustrative rather than restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms and equivalent changes without departing from the scope of protection of the purpose of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for weaving a stent, characterized in that: The braiding method is implemented based on a cylindrical rod core, which is used to braid wires to form a stent, including: a rod body, holes distributed in rows and columns at the intersection of the length dividing line and the circumference dividing line of the rod body, and positioning pins, the length dividing line is arranged along the length direction of the rod body, and the circumference dividing line is arranged along the circumference direction of the rod body; the positioning pins are arranged in the holes, and the positioning pins are higher than the circumferential outer surface of the rod body; the wire takes any one of the positioning pins as a starting point, bypasses the top of the positioning pin, and then wraps around the bottom of the positioning pins in the next row and column, and reciprocates up and down in a Z-shaped manner along the circumference direction of the rod body to bypass the positioning pins and bend, and weaves down layer by layer to form the stent; the braiding method includes the following steps: Step S1, using any positioning pin in the second row corresponding to any end of the columnar rod core as the starting first reference positioning pin, allowing the wire to be introduced from above the first reference positioning pin and then led out obliquely upward from its bottom, using the first row positioning pin obliquely above the first reference positioning pin as the second reference positioning pin for winding, allowing the wire to be led out obliquely downward from the top of the second reference positioning pin, and then winding around the second row positioning pin obliquely below the second reference positioning pin and leading out obliquely upward from the bottom; subsequently, allowing the wire to be Z-shaped between the first row positioning pin and the second row positioning pin and repeating step S1 up and down until there is no corresponding positioning pin that needs to be bypassed at the second row positioning pin, and this positioning pin is used as the third reference positioning pin; Step S2, after the wire is led out obliquely downward at the top of the third reference positioning pin and rewound back to the top of the first reference positioning pin, the wire is bypassed by the top of the first reference positioning pin and is wound obliquely downward to the third row of positioning pins, and the third row of positioning pins is used as the fourth reference positioning pin, the wire is returned obliquely upward from the bottom of the fourth reference positioning pin to the second row of positioning pins for winding, and the second row of positioning pins is used as the fifth reference positioning pin, the wire is bypassed by the fifth reference positioning pin from the bottom of the fourth reference positioning pin and is cross-wound with the wire already on the fifth reference positioning pin, so that the wire is cross-wound and led out obliquely downward at the top of the fifth reference positioning pin to the third row of positioning pins; Step S3, making the wire material repeat step S1 up and down in a Z-shape between the second row of positioning pins and the third row of positioning pins to weave until there is no corresponding positioning pin that needs to be bypassed on the third row of positioning pins, that is, the fourth reference positioning pin, and then making the wire material repeat step S2 to change rows and turn to weave, and when the wire material bypasses the second row of positioning pins, it needs to cross-wind with the existing wire material on the second row of positioning pins to form an upper and lower interlocking structure; Step S4, weaving the wire material downward along the length direction of the columnar rod core according to the winding method of step S1 to step S3, extending the length of the braided bracket, and after the bracket is woven to the required length, using the last row of positioning pins that do not need to be bypassed as the termination positioning pins, so that the wire material is wound around the termination positioning pins for one round and then the wire material is led out; Step S5, removing all positioning pins on the columnar rod core to obtain a woven bracket.

2. The method for braiding a stent according to claim 1, characterized in that: In step S3, the weaving direction of the wire between the second row of positioning pins and the third row of positioning pins is opposite to the weaving direction between the first row of positioning pins and the second row of positioning pins, and the weaving direction of the wire between any two rows of positioning pins in the subsequent weaving process is opposite.

3. The method for braiding a stent according to claim 1, characterized in that: In step S3, when the wire is hooked back and cross-wound on the first reference positioning pin, the wire needs to be hooked back and crossed under the two existing wires between the first reference positioning pin and the third reference positioning pin, and hooked out from above the existing wire between the fourth reference positioning pin and the fifth reference positioning pin.

4. The method for braiding a stent according to claim 1, characterized in that: In the step S5, the braided stent needs to be heat treated and shaped before the positioning pins on the columnar rod core are removed, and the remaining wires need to be trimmed.

5. The method for braiding a stent according to claim 1, characterized in that: The wires are cross-woven on the surface of the rod to form a woven mesh with a diamond structure, and the upper and lower layers of the diamond structure are cross-interlocked.

6. The method for braiding a stent according to claim 1, characterized in that: The length dividing line is a ring shape that circles the circumference of the rod body, and the circumference dividing line is a straight line along the length direction of the rod body.

7. The method for braiding a stent according to claim 1, characterized in that: The number of the circumferential dividing lines is 2X, where X is the number of crests or troughs on each row of the bracket, and the length dividing lines and the circumferential dividing lines are set by distributing the length and circumference of the columnar rod core at equal intervals.

8. The method for braiding a stent according to claim 1, characterized in that: The number of the positioning pins in each layer of the rod body is equal, and the positions of the positioning pins in adjacent rows are staggered.

9. A bracket, characterized in that: The stent is made based on the braiding method of the stent according to any one of claims 1 to 8, and the wire is a tough wire.

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