CN116019601A

CN116019601A - Braiding device and braiding method of atrial shunt pressure reducing device

Info

Publication number: CN116019601A
Application number: CN202111402621.9A
Authority: CN
Inventors: 陈松; 王雪丽; 张长东; 孙明; 吴春林; 毛亮
Original assignee: Wuhan Weike Medical Technology Co ltd
Current assignee: Wuhan Weike Medical Technology Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2023-04-28

Abstract

The invention discloses a braiding device and a braiding method of an atrial shunt pressure reducing device, which relate to the technical field of cardiac atrial shunt equipment for interventional operation treatment, wherein the braiding device is specially used for one braiding wire, and braiding of a braiding net is finished by the assistance of the braiding device; the method has great promotion effect on the improvement of the production efficiency of the product; meanwhile, the structure of the braiding device is further designed, so that the length of the braided net formed by braiding can be effectively controlled, the braided net with the required length can be braided according to actual needs, and the size consistency of mass production products is improved; meanwhile, the situation that the woven net needs to be cut off to cause material waste in the prior art is avoided.

Description

Braiding device and braiding method of atrial shunt pressure reducing device

Technical Field

The invention relates to the technical field of heart atrium shunt equipment for interventional operation treatment, in particular to a braiding device for braiding an atrium shunt pressure reducing device and a braiding method by using the braiding device.

Background

Atrial shunt devices are used to reduce left atrial load (LA Overload) in heart failure patients, thereby improving patient clinical symptoms, exercise tolerance and prognosis; in the prior art, the atrial shunt device is woven through a plurality of weaving wires, and meanwhile, as the process is relatively complex in weaving technology, the requirements on the weaving technology are high, and the training time and the cost of personnel input by enterprises are correspondingly increased.

Meanwhile, the traditional braiding is adopted, and the common practice is braiding of fixed length, because the effective length of the finally formed braided net (namely the preliminarily formed atrial shunt pressure reducing device) cannot be controlled by the traditional braiding, and the redundant length is required to be cut off according to actual conditions in the subsequent specific use; the braiding mode can not be used for braiding according to actual conditions so as to improve braiding efficiency, and meanwhile, the material is wasted due to the fact that redundant lengths are cut off.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a braiding device, which is used for assisting in completing braiding of a braided net, and simultaneously improves the structure of the braiding device to braid the braided net with different lengths according to actual needs, thereby achieving the purposes of improving braiding efficiency and saving enterprise input cost.

The specific scheme provided by the invention is as follows:

a braiding apparatus for braiding a braided net by a single braided wire, the braiding apparatus includes

A cylindrical body having a central axis;

the first limiting rings are formed by a plurality of first limiting nails which are circumferentially distributed on the outer wall of the cylindrical body in a row around the central shaft; and

the second limiting rings are formed by a plurality of second limiting nails which are circumferentially distributed on the outer wall of the cylindrical body in a row around the central shaft; the first limiting ring and the second limiting ring move on the cylindrical body along the axis so as to change the distance between the first limiting ring and the second limiting ring.

Further, the outer wall of the cylindrical body is provided with a plurality of rows of mounting holes along the axial direction, the first limit nails are respectively inserted into one row of the mounting holes to form the first limit rings, and the second limit nails are respectively inserted into the other row of the mounting holes to form the second limit rings.

Further, each first limiting nail and each second limiting nail are detachably connected with the mounting holes, and the first limiting nails and/or the second limiting nails are mounted in the mounting holes in different rows so that the distance between the first limiting rings and the second limiting rings is changed.

Further, the mounting hole is a threaded hole, threaded joints are arranged on the first limiting nails and the second limiting nails, and the first limiting nails and the second limiting nails are in threaded fit with the threaded holes through the threaded joints so as to complete detachable connection.

Further, a plurality of threading grooves are formed in the outer wall of the cylindrical body, and the mounting holes are respectively formed in the bottoms of the threading grooves.

Further, the outer wall of the cylindrical body is sleeved with a first ring body and a second ring body which can move along the axial direction; the first limit nails are arranged on the first ring body in a divergent mode; the second limit nails are arranged on the second ring body in a divergent mode; the relative movement between the first ring body and the second ring body enables the distance between the first limiting ring and the second limiting ring to be changed.

Further, fixing holes are formed in the outer walls of the first ring body and the second ring body in a penetrating mode, and the opening direction of the fixing holes faces the radial direction of the cylindrical body; the fixing Kong Naxuan is provided with an abutting bolt, and the abutting bolt is adjusted until abutting against the outer wall of the cylindrical body, so that the fixing of the positions of the first ring body and the second ring body is completed.

Further, the number of the first limit nails is the same as the number of the second limit nails.

Further, each second limiting nail is arranged on a middle vertical plane of a plane formed by connecting two adjacent first limiting nails, or each second limiting nail is in positive opposition to each first limiting nail.

According to the provided braiding apparatus, the present solution further provides an introduction regarding a specific braiding method of the braiding apparatus:

a braiding method of an atrial shunt decompression device adopts the braiding device to carry out braiding, and specifically comprises the following steps:

s1, adjusting positions of a first limiting ring and a second limiting ring on the cylindrical body to enable a distance between the first limiting ring and the second limiting ring to be equal to a required length;

s2, selecting a braided wire made of shape memory materials, simultaneously selecting any one of first limiting nails in the first limiting rings as a starting limiting nail, obliquely downwards surrounding the tubular body along the outer wall of the tubular body from the starting limiting nail until reaching a second limiting ring corresponding to the starting limiting nail, and defining the second limiting nail as an end limiting nail;

s3, bending the end point limiting nails and obliquely winding the outer wall of the cylindrical body to the first limiting nails adjacent to the start point limiting nails; continuing to obliquely downwards wind one periphery of the outer wall of the cylindrical body to a second limit nail adjacent to the terminal limit nail after bending;

s4, repeating the step S3 until the density of the whole woven mesh reaches a set density, and forming the woven mesh with an upper end part and a lower end part;

s5, guiding the initial thread end and the tail end of the braided wire to the lower end part;

s6, taking down all the first limit nails and all the second limit nails on the cylindrical body; the method comprises the steps of (1) converging a preliminarily formed atrial shunt decompression woven net, sleeving the lower end part of the woven net, a starting thread end and a ending thread end into a fastening device, sleeving a connecting device outside the fastening device, and fixedly connecting the connecting device with the fastening device;

s7, shaping the braided wires through a shaping die, and performing heat treatment to finally shape the braided wires.

Further, the braiding wires are subjected to warp-weft staggered braiding in the braiding device to form a braiding net.

Further, on the orthographic projection surface of the woven net, each warp woven wire and each weft woven wire are in wave-shaped staggered weaving.

Further, on the orthographic projection surface of the woven net, the plurality of warp-wise woven wires and the plurality of weft-wise woven wires with the same number are in wave-shaped staggered weaving.

Further, between the steps S4 and S5, there is a step of closing the upper end portion, that is

S4-1, reversely dragging the initial thread end and the tail end of the knitting yarn at the bending position of the upper end part, knitting the knitting yarn in an S-shaped staggered undulating mode to form a closing yarn, and forming at least two circles of closing yarn.

Further, the braided wires are made of degradable materials.

Further, the surface of the braided wire is coated with a polymer coating.

The beneficial effects achieved by adopting the technical scheme are as follows:

1. the single braiding device is arranged to complete braiding operation of one braiding wire, and braiding of the braided net is completed with the assistance of the braiding device, so that compared with the traditional product production process flow, the capability and the requirement on a post-braiding treatment process are greatly reduced; has great promotion effect on the improvement of the production efficiency of the product.

2. The tubular body of the braiding device is provided with the first limiting ring and the second limiting ring which can be axially adjusted, and before specific braiding, the spacing distance between the first limiting ring and the second limiting ring is adjusted according to actual requirements, so that the length of a braided net formed by braiding can be effectively controlled, the braided net with the required length can be braided according to actual requirements, and the consistency of the product size in mass production is ensured; the situation that the woven net needs to be cut off to cause material waste like the traditional is avoided.

Drawings

Fig. 1 is a perspective view of a knitting apparatus according to a first embodiment.

Fig. 2 is a top view of the device of fig. 1.

Fig. 3 is a perspective view of the knitting apparatus in the second mode.

Fig. 4 is a diagram of a structure of a preliminary knitted fabric.

Fig. 5 is a schematic view of the lower end of the gathered mesh grid ready to be secured with a fastening device.

Fig. 6 is a schematic view of the lower end portion of the mesh grid fixed by the fastening device.

Fig. 7 is a partial view showing a one-by-one woven mesh structure.

Fig. 8 is a partial view showing a two-in-two woven mesh structure.

Fig. 9 is a block diagram of the atrial shunt pressure reducing device after thermoforming.

Wherein: the device comprises a first limiting ring 10, a first limiting nail 11, a second limiting ring 20, a second limiting nail 21, a cylindrical body 30, a first ring body 31, a second ring body 32, a wire threading groove 33, a fastening device 41, a connecting device 42 and a 100 binding wire.

Detailed Description

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

The embodiment provides a braiding device, wherein only one braiding wire is used for completing braiding of an atrial shunt decompression device (simply called a braiding net) so as to achieve the purposes of improving braiding efficiency and braiding any length according to actual requirements.

In this scheme, see fig. 1, the composition of the braiding apparatus includes a tubular body 30, and a first stop collar 10 and a second stop collar 20 disposed on the tubular body 30, where the tubular body 30 is mainly used to play a supporting role, and in a specific braiding process, the braiding wires are used to wind back and forth between the first stop collar 10 and the second stop collar 20, so as to form a required braided mesh.

Specifically, the cylindrical body 30 has a cylindrical structure with a central axis, the first stop collar 10 is formed by a plurality of first stop nails 11, and the plurality of first stop nails 11 are circumferentially distributed in a row around the central axis on the outer wall of the cylindrical body 30; that is, it can be understood that the plurality of first limiting nails 11 are surrounded in a divergent shape to form a row on the outer wall of the cylindrical body 30 by taking the central shaft as the center, so that the first limiting nails 11 in a divergent shape form the first limiting ring 10; the second stop collar 20 has the same structure as the first stop collar 10, and the second stop collar 20 is formed by a plurality of second stop nails 21 circumferentially distributed in a row around a central axis on the outer wall of the cylindrical body 30.

In order to realize the control of the length of the mesh grid, the first stop collar 10 and the second stop collar 20 described above are moved along the axis on the cylindrical body 30 to change the spacing between the first stop collar 10 and the second stop collar 20.

It can be understood that the distance between the first stop collar 10 and the second stop collar 20 determines the length of the final woven mesh, and when the device is used specifically, the first stop collar 10 and the second stop collar 20 can be adjusted by setting the first stop collar 10 and the second stop collar 20 which can be adjusted, or the second stop collar 20 can be adjusted only, or the first stop collar 10 and the second stop collar 20 can be adjusted simultaneously, so that the distance between the two adjusting rings can be adjusted and changed according to actual needs, and the woven mesh which is actually needed can be woven.

Through designing two spacing rings (namely first spacing ring 10 and second spacing ring 20) adjustable, when weaving, can weave according to actual demand, compare in traditional fixed length's scheme of weaving, weave reasonable length and be favorable to improving the efficiency of weaving, still stop the extravagant condition of material simultaneously, no longer need cut unnecessary mesh grid structure, reduced the cost input of enterprise.

In this scheme, the adjustment of the spacing length between the first spacing ring 10 and the second spacing ring 20 can be achieved by two schemes.

Scheme one:

the outer wall of the cylindrical body 30 is provided with a plurality of rows of mounting holes along the axial direction, the first limiting nails 11 are respectively inserted into one row of mounting holes to form a first limiting ring 10, and the second limiting nails 21 are respectively inserted into the other row of mounting holes to form a second limiting ring 20.

It can be understood that the first limit nails 11 and the second limit nails 21 are directly connected with the cylindrical body 30 in a mounting way, and each first limit nail 11 and each second limit nail 21 are detachably connected with the mounting hole; the first limit nails 11 and the second limit nails 21 can be inserted into mounting holes in different rows according to actual needs in a detachable mode; in a specific implementation, when the adjustment of the spacing is required, only the first spacing nail 11 may be adjusted and installed in the installation holes of different rows, only the second spacing nail 21 may be adjusted and installed in the installation holes of different rows, or the positions of the first spacing nail 11 and the second spacing nail 21 may be adjusted simultaneously.

In the scheme, the mounting holes are threaded holes, threaded joints are arranged on the first limit nails 11 and the second limit nails 21, and the detachable connection is completed through the threaded joints and the threaded holes in a screw fit mode; namely, the first limit nail 11 and the second limit nail 21 are detachably connected with the cylindrical body 30 in a screwing mode.

Alternatively, referring to fig. 2, a plurality of wire passing grooves 33 are formed on the outer wall of the cylindrical body 30, and the above-described mounting holes are respectively formed at the bottom of each wire passing groove 33, so that the first limit nails 11 and the second limit nails 21 are finally distributed in each wire passing groove 33; the threading groove 33 is provided for improving the convenience of knitting, and the knitting yarn can pass along the threading groove 33 when the knitting yarn needs to be wound on the lower portion of the mesh grid during the knitting process.

Scheme II:

referring to fig. 3, the outer wall of the cylindrical body 30 is sleeved with a first ring body 31 and a second ring body 32 which can move along the axial direction; the first ring body 31 is used for bearing the first limiting nails 11, i.e. a plurality of first limiting nails 11 are arranged on the first ring body 31 in a divergent manner; the second ring body 32 is used for bearing the second limiting nails 21, and a plurality of second limiting nails 21 are arranged on the second ring body 32 in a divergent mode; the relative movement between the first ring 31 and the second ring 32 causes the spacing between the first stop collar and the second stop collar to be changed.

Through adopting the structural style of first ring body 31 and second ring body 32, when carrying out the regulation of first spacing ring and second spacing ring interval, compare in scheme one more convenient, easy operation realizes.

After the adjustment is completed, the first ring body 31 and the second ring body 32 need to be fixed to limit the distance between the first limiting ring and the second limiting ring; the specific fixing structure is as follows: fixing holes (not shown) are formed in the outer walls of the first ring body 31 and the second ring body 32 in a penetrating manner, and the opening direction of the fixing holes faces the radial direction of the cylindrical body 30; an abutment bolt (not shown) is disposed on the fixing Kong Naxuan, and the abutment bolt is adjusted until abutting against the outer wall of the cylindrical body 30, so as to fix the positions of the first ring body 31 and the second ring body 32.

It can be understood that when the first ring 31 and the second ring 32 need to be adjusted and moved, the abutting bolts on the first ring 31 and the second ring 32 are loosened, so that the abutting bolts are no longer abutted with the cylindrical body 30; after the movement adjustment is completed, the abutment bolt is reversely screwed again so that the abutment bolt abuts against the outer wall surface of the cylindrical body 30, thereby completing the fixation.

In this embodiment, in order to guarantee that every spacing nail can all be used, avoid the unnecessary setting of spacing nail to unnecessary spacing nail disturbs the work of weaving to weaving the body. The number of the first and second spacing nails 11 and 21 is the same.

Meanwhile, in the present embodiment, the first spacing nail 11 in the first spacing ring 10 and the second spacing nail 21 in the second spacing ring 20 have two arrangement modes in the same position structure: the first is: each second spacing nail 21 is on a median vertical plane of the plane formed by the connecting lines of two adjacent first spacing nails 11, or the second type: each second spacing nail 21 is in one-to-one positive opposition to each first spacing nail 11.

By adopting the arrangement of the structure for the braiding device, not only can the efficiency in the braiding process be improved, but also the braiding of the braided net with reasonable length can be carried out according to actual requirements, the consistency of the product size in mass production is improved, and the stability of the structure of the finally formed atrial shunt decompression device is ensured; the waste of raw materials caused by cutting off the woven mesh is avoided.

The following takes a structure that each second spacing nail 21 is opposite to each first spacing nail 11 one by one as an example, and the specific steps of knitting by using the above knitting device will be further described:

the specific braiding steps comprise the following steps:

s1, adjusting positions of a first limiting ring 10 and a second limiting ring 20 on a cylindrical body 30 to enable a distance between the first limiting ring 10 and the second limiting ring 20 to be equal to a required length;

s2, selecting a braiding wire made of shape memory materials, such as nickel titanium alloy materials, selecting any one of the first limiting nails 11 in the first limiting nail 10 as a starting limiting nail, obliquely downwards surrounding the tubular body 30 for one circle along the outer wall of the tubular body 30 from the starting limiting nail until reaching the position of the second limiting nail 20 right below the starting limiting nail, and defining the second limiting nail 21 as an ending limiting nail;

s3, bending at the end limiting nail, and obliquely winding the outer wall of the cylindrical body 30 to the other first limiting nail 11 adjacent to the start limiting nail; continuing to obliquely wind down around one periphery of the outer wall of the cylindrical body 30 to the position of the other second limiting nail 21 adjacent to the terminal limiting nail after bending;

s4, repeating the step S3 until the density of the whole woven mesh reaches a set density to form a woven mesh with an upper end and a lower end, see FIG. 4;

preferably, after the woven mesh is preliminarily formed, the upper end part of the woven mesh can be closed, so that the aim of ensuring the stability of the structure of the woven mesh is fulfilled.

The starting thread end and the ending thread end of the knitting yarn which are positioned at the first limiting ring 10 (namely the upper end part of the knitting net) are reversely pulled at the bending part of the upper end part, and the knitting yarn which is in an S shape and the upper end part are alternately and undulated to form the closing yarn 100, and the closing yarn 100 at least forms two circles.

S5, after the knitting of the closing-in wire 100 is completed, guiding the initial thread end and the tail end of the knitting wire to the lower end;

s6, taking down all the first limit nails 11 and all the second limit nails 21 on the cylindrical body 30; the method comprises the steps of performing a closing treatment on a preliminarily formed atrial shunt decompression woven mesh, sleeving the lower end part, a starting thread end and a ending thread end of the woven mesh into a fastening device 41, sleeving a connecting device 42 outside the fastening device, and fixedly connecting the connecting device 42 with the fastening device 41, wherein the drawing is shown in fig. 5-6; therefore, the capability and the requirement on the post-weaving treatment process are greatly reduced, and the scheme of sleeving the fastening device after cutting off the redundant length is not needed as the conventional scheme, and the scheme is efficient and convenient for sleeving the fastening device 41 and the connecting device 42 on the bundled woven mesh directly.

Alternatively, the fastening means 41 and the connecting means 42 may be rivet sleeves and stainless steel nuts, respectively.

S7, shaping the braided wires through a shaping die and performing heat treatment, and finally shaping the braided wires, wherein the atrial shunt pressure reducing device is shaped, and the shaped atrial shunt pressure reducing device comprises a left disc, a right disc and a waist part used for connecting the left disc and the right disc, and the left disc, the waist part and the right disc are integrally braided by one braided wire, so that the atrial shunt pressure reducing device has a great promotion effect on ensuring the strength of products.

In the braiding process of the scheme, the braiding wires are subjected to warp-weft staggered braiding in the braiding device to form a braided net, and the finally braided net structure can be one-pressure or multi-pressure structure.

One-to-one is understood to mean that each warp knitting yarn and each weft knitting yarn are waved and staggered on the orthographic projection plane of the knitting net; i.e., each adjacent warp knitting yarn or each adjacent weft knitting yarn is in a different undulating state, and the structure (i.e., one-to-one) in which one knitting yarn presses one knitting yarn on the projection surface is shown in fig. 7.

The multi-pressure multi-mode can be understood as that on the orthographic projection surface of the woven net, a plurality of warp-direction woven wires and a plurality of weft-direction woven wires with the same quantity are in wave-shaped staggered weaving; namely, a structure that a plurality of knitting wires are pressed on a projection surface, two are taken as an example, and a structure that every two knitting wires are pressed for knitting the other two knitting wires (namely, two-pressing two) is shown in the figure, and the structure is shown in fig. 8.

Only one knitting yarn is adopted, and the knitting net (namely the atrium shunt pressure reducing device) with different structural strength can be provided by different knitting modes (one-press multi-press), for example, each knitting yarn of the knitting net obtained by adopting the one-press one-knitting mode is connected with each other, the strength is obviously stronger than that of a net plug structure obtained by adopting the multi-press multi-knitting, and the stability is better; but the internal stress of the woven net structure obtained by multi-pressure multi-weaving is smaller, the plasticity is stronger than that of the net plug obtained by one-pressure one-weaving, the change is easier to be made according to the actual condition of a patient, and the woven net can be woven in any structure according to the requirement during the weaving.

Optionally, one of the braided filaments is made of a degradable material, and the braided filaments can be gradually degraded in a human body after endothelialized tissues are formed by utilizing the degradable property of the material; in order to accelerate the endothelialization process, the surface of the braided wire can be coated with polymer coatings such as a parylene coating, a polytetrafluoroethylene coating, a drug coating (rapamycin) and the like; the characteristic of the polymer coating can effectively reduce the formation of thrombus, reduce the release of nickel ions and achieve the aim of accelerating the endothelialization process.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. A braiding apparatus for braiding a braided mesh with a braided wire, the braiding apparatus comprising

A tubular body (30) having a central axis;

the first limiting rings (10) are formed by a plurality of first limiting nails (11) which are circumferentially distributed in a row around the central shaft on the outer wall of the cylindrical body (30); and

the second limiting rings (20) are formed by a plurality of second limiting nails (21) which are circumferentially distributed in a row around the central shaft on the outer wall of the cylindrical body (30); the first limiting ring (10) and the second limiting ring (20) move on the cylindrical body (30) along an axis so as to change the distance between the first limiting ring (10) and the second limiting ring (20).

2. A braiding apparatus according to claim 1, wherein the outer wall of the tubular body (30) is provided with a plurality of rows of mounting holes in an axial direction, the first limiting pins (11) are respectively inserted into one row of the mounting holes to form the first limiting rings (10), and the second limiting pins (21) are respectively inserted into the other row of the mounting holes to form the second limiting rings (20).

3. A weaving device according to claim 2, characterized in that each first spacing peg (11), each second spacing peg (21) is detachably connected to the mounting hole, the first spacing peg (11) and/or the second spacing peg (21) being mounted into different rows of mounting holes such that the spacing between the first spacing ring (10) and the second spacing ring (20) is changed.

4. A braiding apparatus according to claim 3, wherein the mounting holes are threaded holes, and the first spacing nails (11) and the second spacing nails (21) are provided with threaded joints, and the threaded joints are in screw fit with the threaded holes to complete the detachable connection.

5. A knitting apparatus according to claim 4, characterized in that a plurality of threading grooves (33) are provided on the outer wall of the tubular body (30), and the mounting holes are provided at the groove bottom of each threading groove (33), respectively.

6. A braiding apparatus according to claim 1, wherein the outer wall of the tubular body (30) is sleeved with a first ring body (31) and a second ring body (32) which are axially movable; the first limit nails (11) are arranged on the first ring body (31) in a divergent mode; the second limit nails (21) are arranged on the second ring body (32) in a divergent mode; the relative movement between the first ring body (31) and the second ring body (32) enables the distance between the first limiting ring (10) and the second limiting ring (20) to be changed.

7. A braiding apparatus according to claim 6, wherein the outer walls of the first ring body (31) and the second ring body (32) are each provided with a fixing hole penetrating therethrough, and the opening direction of the fixing holes is directed in the radial direction of the tubular body (30); the fixing Kong Naxuan is provided with an abutting bolt, and the abutting bolt is adjusted until abutting against the outer wall of the cylindrical body (30) so as to fix the positions of the first ring body (31) and the second ring body (32).

8. A knitting apparatus as claimed in claim 5 or 7, characterized in that the number of the first limit pegs (11) and the second limit pegs (21) is the same.

9. A knitting apparatus as claimed in claim 8, characterized in that each of the second spacing nails (21) is arranged on a plane perpendicular to a plane formed by connecting two adjacent first spacing nails (11), or each of the second spacing nails (21) is arranged in a positive opposition to each of the first spacing nails (11).

10. A method of braiding an atrial shunt pressure reducing device according to claim 9, comprising the steps of:

s1, adjusting positions of a first limiting ring (10) and a second limiting ring (20) on a cylindrical body (30) to enable a distance between the first limiting ring (10) and the second limiting ring (20) to be equal to a required length;

s2, selecting a braided wire made of a shape memory material, selecting any one of first limiting nails (11) in the first limiting rings as a starting limiting nail, obliquely downwards surrounding the tubular body (30) along the outer wall of the tubular body (30) from the starting limiting nail until reaching a second limiting ring (20) corresponding to the starting limiting nail, and defining a second limiting nail (21) as an ending limiting nail;

s3, bending at the end limiting nail, and obliquely winding the outer wall of the cylindrical body (30) to the first limiting nail (11) adjacent to the start limiting nail; continuing to obliquely downwards wind one periphery of the outer wall of the cylindrical body (30) to the position of a second limit nail (21) adjacent to the terminal limit nail after bending;

s6, taking down all the first limit nails (11) and all the second limit nails (21) on the cylindrical body (30); the method comprises the steps of (1) converging a preliminarily formed atrial shunt decompression woven net, sleeving the lower end part of the woven net, a starting thread end and a ending thread end into a fastening device (41), sleeving a connecting device (42) outside the fastening device (41), and fixedly connecting the connecting device (42) with the fastening device (41);

11. The method of claim 10, wherein the braided filaments are woven in the braiding apparatus in a warp-weft staggered manner to form a braided mesh.

12. The method of claim 11, wherein each warp-wise braided wire and each weft-wise braided wire are woven in a wavy staggered manner on the orthographic projection plane of the woven mesh.

13. The method of claim 11, wherein the plurality of warp-wise woven filaments are staggered in a wavy manner with the same number of weft-wise woven filaments on the orthographic projection plane of the woven mesh.

14. The method of knitting an atrial shunt pressure reducing device according to claim 11, further comprising the step of crimping an upper end portion between steps S4 and S5, wherein the upper end portion is crimped with a material that is a material of the upper end portion of the device

S4-1, reversely dragging an initial thread end and a tail end of the knitting yarn at the bending position of the upper end part, knitting in an S-shaped staggered undulating mode to form a closing yarn (100), and forming at least two circles of the closing yarn (100).

15. The method of braiding an atrial shunt pressure reducing device of claim 10, wherein the braided filaments are coated with a polymeric coating on their surface.