CN100594015C - Rack valve with tongulate structure and its rack weaving process - Google Patents

Abstract

A stent valve with a tongue-like structure, comprising an inner stent body, at least one outer tongue-like structure, valve leaflets, a sealing membrane, a sealing ring, a flexible coupling ring and radiopaque markers. The three outer tongue-like structures are evenly distributed along the radial rotation angle of the inner stent body, and the valve leaflets are three, and the three valve leaflets correspond to the three outer tongue-like structures respectively. When the stent valve is implanted, the inner stent body and the outer tongue-like structure cooperate with the independent stent wire-locking system on the delivery device, and the outer tongue-like structure can be expanded independently of the inner stent body. A braiding method for a stent with a tongue-like structure, which is braided by elastic metal wires spirally advancing along the outer contour of the stent. The shape, structure and function of the stent valve of the present invention are more optimized, and the tongue-like structure of the outer layer is beneficial to the accurate positioning and fixing of the stent valve in the axial direction and the rotation direction. The weaving method of the present invention is simple and scientific, and only a single thread is used to spirally wind back and forth to weave a bracket with a complex structure.

Description

Stent valve with tongue-like structure and braiding method for the stent

technical field

The invention relates to a human tissue substitute and a manufacturing method thereof, in particular to a stent valve with a tongue-like structure and a weaving method of the stent.

Background technique

The heart is the most important organ of the human body. The heart is divided into two parts, the left and the right, and each part includes the atrium and the ventricle. The left and right atria and right and left ventricles are separated by the atrial and ventricular septum, respectively. There are four heart valves in the heart, namely the tricuspid valve, pulmonary valve, mitral valve and aortic valve. In the human blood circulation mechanism, the four heart valves play a vital role. The hypoxic blood from the systemic circulation mechanism enters the right atrium through the vena cava, and then enters the right ventricle through the tricuspid valve. The contraction of the right ventricle pushes the blood into the pulmonary circulation mechanism through the pulmonary valve, and the oxygen-saturated blood returns to the left atrium through the pulmonary vein, and then Through the mitral valve to the left ventricle, the left ventricle contracts to expel blood through the aortic valve into the aorta and return to the systemic circulation. There are left and right coronary artery openings under the aortic valve. The structure of the four heart valves ensures that the valves open when the blood flows in the forward direction and close when the blood flows in the opposite direction, preventing the heart from increasing the burden caused by the backflow of blood. However, due to various reasons, acquired damage or disease of heart valves can be caused, such as rheumatism, atherosclerosis, etc. In addition, congenital heart disease such as tetralogy of Fallot can also cause pulmonary valve disease in the long term after surgery. After valvular disease, the valve function is gradually lost, such as valvular insufficiency leading to blood regurgitation, valvular stenosis leading to poor blood flow, or both insufficiency and stenosis, which will increase the burden on the heart and lead to heart failure. For the acquired damage or disease of the heart valve, the traditional treatment method is to open the chest, and after the heart stops beating, the heart is opened to perform surgical repair of the diseased valve or replace it with an artificial heart valve under the support of hypothermic extracorporeal circulation. The existing artificial heart valves are divided into two categories: metal mechanical valves and biological valves. Biological valves are made from processed animal materials such as bovine pericardium, bovine jugular valve, and porcine aortic valve. The above-mentioned open-heart surgery method has long operation time, high cost, large trauma, and high risk. After metal mechanical valve replacement, the patient needs long-term anticoagulant treatment, and the material life of the biological valve is limited, and reoperation is usually required.

In order to solve the above-mentioned problems of open-heart surgery for the treatment of heart valves, some people try not to perform open-heart surgery, but use percutaneous intervention or minimally invasive surgery to deliver artificial heart valves. The artificial heart valve of prior art has two kinds:

1. Balloon-expandable

This balloon-expandable artificial heart valve is a biological valve. The intervention method is to respectively fix the biological valve on a plastically deformable stent, radially compress it on a balloon, and then reduce the diameter, deliver it percutaneously, and then give it to the patient. The balloon is pressurized to expand and fix the stent to reach the working state.

The disadvantages and problems of the balloon-expandable artificial valve are: its diameter is determined by the diameter of the balloon. If the diameter of the artificial valve is not selected at the beginning, or after some physiological changes, such as natural growth, pathological vascular expansion, etc., The caliber of the natural valve may increase, but the caliber of the artificial valve cannot be adaptively increased, and the artificial valve may loosen or slip off, so only secondary balloon re-expansion can be performed.

2. Self-expanding

This prosthetic valve features an elastically deformable stent that expands on its own after being radially compressed.

The disadvantages and problems of the self-expandable artificial valve in the prior art are: the frictional force between the self-expandable artificial heart valve and the sheath tube is large, which affects the accurate release of the artificial valve.

The common shortcoming and the problem that above-mentioned balloon expansion type and self-expanding artificial heart valve exist are:

1. The existing artificial stent valve is relatively hard under radial compression, has poor flexibility, is not easy to pass through the aortic arch, and cannot be aligned with the natural aortic valve orifice.

2. Even with the help of X-ray fluoroscopy, the axial upstream and downstream positioning of the artificial stent valve becomes difficult due to the inaccurate judgment of the anatomical position and the instability of the artificial valve under the impact of blood flow. A prosthetic aortic valve can affect the mitral valve if it is placed upstream, and it can block the opening of the coronary arteries if it is positioned downstream.

3. The positioning of the rotation direction of the artificial aortic valve stent valve has not been solved. If the rotation position of the artificial aortic valve is wrong, it may block the coronary artery opening.

4. During the release process, the stent valve gradually expands from half to full expansion, and the required time exceeds one heartbeat cycle. The expanded stent valve can obstruct blood flow, and the stent valve can also change its position due to the impact of blood flow. In particular, balloon-expandable prosthetic stent-valves completely block blood flow during balloon expansion.

5. There are also the following problems in the fixation of the stent valve after release and expansion:

a) The impact of blood flow during systole and diastole will move the poorly fixed artificial stent valve.

b) Some patients with aortic valve insufficiency have pathological expansion of the aortic root before surgery, and a large stent valve is needed to anastomose and fix it.

c) Some patients will have local anatomical changes after the artificial stent valve is implanted, such as expansion, so that the stent valve that cannot be changed accordingly will lose effective fixation.

6. In many cases, the artificial stent valve after expansion and fixation has paravalvular leaks (Para valvular leaks), that is, blood leaks between the stent valve and the vessel wall.

7. If the metal stent is in contact with the valve leaflet switch, the valve leaflet will be worn out.

8. If a large-diameter stent valve is used for fixation, the commissure of the valve leaflets will bear a lot of stress, resulting in tearing of the commissure of the valve leaflets.

Contents of the invention

The object of the present invention is to overcome the above-mentioned problems in the prior art, and provide a novel structure of a stent valve with a tongue-like structure and a braiding method for the stent.

The object of the present invention is achieved in this way: a stent valve with a tongue-like structure comprises a radially deformable tubular mesh stent, the mesh stent includes an upstream section, a middle section and a downstream section, and each mesh wire of the mesh stent A plurality of deformable units are surrounded, and a plurality of arc-shaped turns are formed at both ends of the mesh support, and a plurality of closed line eyes, a plurality of flexible coupling rings and a plurality of impermeable Xs are arranged on the mesh support. Line marks, valve leaflets are connected to the inner side of the middle section of the mesh stent, and the inner and/or outer sides of the upstream section of the mesh stent are covered with a sealing film. It is characterized in that the mesh stent includes a round tube or Tubular inner layer stent body with radially protruding structure, at least one tongue-like structure surrounded by mesh wires is connected to the outside of the inner layer stent body, preferably three outer layer tongue-like structures, three outer layer tongue-like structures The tongue-shaped structures are evenly distributed along the radial direction of the inner stent body, and each tongue-shaped structure is connected with the inner stent body at the downstream section or at the junction of the downstream section and the middle section to form a fixed edge, and extends from the fixed edge to the upstream section to the upstream A free edge is formed at the junction of the segment and the middle segment; the valve leaflets are three, and the three valve leaflets are distributed at a 120-degree rotation angle.

The outer tongue-shaped structure is axially and radially corresponding to the inner radially protruding structure, and is arranged at the same rotation angle.

The valve leaflets are axially and radially corresponding to the tongue structure, and are arranged at the same axial level and radial rotation angle.

A weaving method for a stent with a tongue-like structure is as follows: a circular tube or a circular tube-shaped inner mold with a radially protruding structure is established, and an elastic metal wire is used as the braiding line. The key points of the braiding are as follows:

A. Take the braided wire and start from the downstream port close to the stent, spirally wind along the outer contour of the inner mold, and then turn to the opposite direction of symmetry and spirally wind along the outer contour of the inner mold at the upstream port of the stent, and repeat until all All deformable units have been established and braided into a circular tube or a circular tube-shaped inner stent with a radially protruding structure;

B. Repeat braiding from the same braided wire starting from the braided wire starting point at the downstream port of the braided inner stent body. After weaving to an angle equivalent to about 60 degrees around the stent, let the braided wire break away from the inner stent body and move outward Stretch out and wind into a tongue-like structure, then turn to the opposite direction of symmetry and enter the inner support body to repeat weaving. Stretch out and wind into a tongue-like structure, then turn to the opposite direction of symmetry and enter the inner support body to repeat weaving until three outer tongue-like structures are braided. downstream port;

C. When weaving the outer layer tongue-shaped structure, control the exit point of the braided wire protruding from the inner layer support body and the entry point entering the inner layer support body on the same radial plane of the inner layer support body, and control the exit point and the entry point of the inner layer support body The distance between the entry points is equivalent to about one-third of the circle around the stent, and the free edge of the control tongue structure is located at the junction of the upstream section and the middle section of the inner stent body;

D. The number of deformable units located on the same radial plane of the inner stent body is woven into a multiple of 3;

E. Different line segments of the braided line form an up and down stagger point when they intersect, and the upper and lower positions of the same line segment at its adjacent stagger point are opposite, and the two line segments on the same stagger point can slide mutually;

F. When weaving the inner stent body, the deformable unit formed by different line segments of the braided wire is a quadrilateral, and the braided wire forms an arc-shaped turn when the upstream port and the downstream port of the stent turn;

G. When weaving the inner stent body, turn the braided wire at least 360 degrees at a cross point or inflection point at both ends of the stent or other parts to form a closed thread eye;

H. When weaving the inner stent body, cover the braiding wires of different parts of the stent with X-ray-opaque signs as required, such as covering X-ray-opaque marks on the double-line segment or the double-line segment of the closed line eye Logo ring.

In the above-mentioned point B, after the braided wire protrudes from the inner support body, it can also be wound around a collar of at least 360 degrees and then a half-ring. The radian of the collar is equivalent to that of the half-ring. One part forms the tongue-like structure together with the half ring.

The collar can be completely free from the inner stent, or it can be braided into the inner stent at the downstream end of the inner stent.

In the above point B, when the braided wire is wound into a tongue-like structure, it can also wind at least 360 degrees at the top of the arc to form a closed line eye, and the double line segment of the closed line eye is covered with an X-ray Logo ring.

In the above point G, the closed thread eye can be woven so that it is on the same outer contour surface as the inner stent or the outer tongue structure, or it can be woven so that it is perpendicular to the inner stent or the outer tongue structure or at any angle.

The tongue structure can also be braided by different braided wires than the inner stent body.

The stent valve with tongue-shaped structure of the present invention has the following advantages and positive effects compared with the prior art due to the adoption of the above-mentioned technical solution:

1. The shape, structure and function are more optimized.

2. The deformable stent can cooperate with biological valves or synthetic valves.

3. Increase the strength and lifespan of the synthetic valve, without anticoagulation, and it is expected to replace the biological valve.

4. The stent valve can be radially compressed, accurately delivered in place with the help of the interventional device, and then expanded.

5. The expanded and released stent valve conforms to the shape of the blood vessel wall in the radial and axial directions.

6. The axial direction and rotational direction of the stent valve with tongue-like structure can be accurately positioned and fixed.

Description of drawings

Fig. 1 is the three-dimensional perspective view of an embodiment of the stent valve with tongue-like structure of the present invention;

Figure 2 is an expanded view of the bracket shown in Figure 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is a three-dimensional perspective view of another embodiment of the stent valve with a tongue-like structure according to the present invention.

Detailed ways

Referring to Fig. 1 and Fig. 4, and referring to Fig. 2 and Fig. 3 for cooperation, the stent valve with tongue-like structure of the present invention includes a circular tube shape (as shown in Figure 1) or a circular tube shape with a radially protruding structure (as shown in Figure 4). (shown) an inner stent body 1, at least one outer tongue structure 2 (preferably three), valve leaflets 3, sealing membrane 4, flexible coupling ring 5 and radiopaque markers 6. The inner stent body 1 is braided by elastic metal wires 101, and is a telescopic body that can deform radially between the expanded state and the compressed state. The inner stent body 1 can be divided into upstream and downstream according to the direction of blood flow in the blood vessel. Section 11, middle section 12 and downstream section 13. A plurality of deformable units 14 are formed between the mesh wires 101 of the inner support body 1, and a plurality of arc-shaped bends 15 are formed at both ends of the mesh support, and a plurality of closed wire eyes 16 are also formed on the mesh support. When there are three outer tongue-like structures 2, the three outer tongue-like structures 2 are connected to the outside of the inner support body 1 and distributed at about 120-degree corners, all surrounded by the same or different mesh wires. Each tongue-shaped structure 2 is connected with the inner support body 1 at the downstream section or the junction of the downstream section and the middle section to form a fixed edge, and extends from the fixed edge to the upstream section to the junction of the upstream section and the middle section to form a free edge. The tongue structure 2 is used to enter the natural leaflet cup. When the inner stent body 1 is radially compressed, the tongue-like structure 2 can be radially compressed to approach the inner stent body 1 at the same time, and when the compression constraint force is removed, the tongue-like structure 2 can expand away from the inner stent body 1 to form a horn open to the upstream port. There are three valve leaflets 3 in the present invention, and the three valve leaflets 3 are distributed and connected to the inner side of the middle section 12 of the inner layer stent body 1 at an angle of about 120 degrees. The valve leaflets 3 can be made of biological materials or synthetic materials. The synthetic material can be an elastomer such as silicone or polyurethane. There are one or more reinforcing fibers 7 in the synthetic material valve leaflet, and the reinforcing fiber 7 starts and ends at two different valve leaflet joint points or joint lines of the same valve leaflet, and is connected to the bracket. The sealing film 4 covers the inner side and/or the outer side of the upstream section 11, and the sealing film 3 of the upstream section can ensure that blood will not leak from the same side of the stent valve. The sealing film 4 can be a biofilm or a synthetic film, and the biofilm can exist on the inside, outside, or both inside and outside of the stent; the synthetic sealing film can be an elastic body such as silica gel, and wrap the stent in the middle. A plurality of flexible coupling rings 5 and a plurality of radiopaque markers 6 are respectively arranged at different positions of the mesh support.

The braiding method of the stent with tongue-shaped structure of the present invention is as follows: first set up a circular tube-shaped or circular tube-shaped internal mold with a radially protruding structure, and then use elastic metal wires as braided wires to weave around the outer contour of the internal mold. The main points can be explained as follows in combination with Figure 1 and Figure 2:

Take the braided wire 101 from a point close to the downstream port of the stent, such as 102 in Figure 2, and spirally wind along the outer contour of the inner mold, and then turn to the opposite direction of symmetry along the inner mold after arriving at the inner mold port corresponding to the upstream port of the stent The outer contour of the spiral winding advances, and repeats until all the deformable units 14 have been established, braided into a circular tube or a circular tube-shaped inner stent with a radially protruding structure. When weaving the inner stent body, different line segments of the braided wires intersect to form up and down interlacing points 103, 103', and the upper and lower positions of the same line segment at its adjacent interlacing points are opposite, such as 103 and 103' shown in Figure 1 . Two line segments located on the same intersection point can slide each other. The deformable unit 14 formed by different line segments of the braided wire 101 is generally a quadrangle, and the braided wire forms an arc-shaped turn 15 when the upstream port and the downstream port of the bracket turn, so the deformable unit 14 at both ends is not a standard quadrilateral. When weaving, the braided wire can be turned at least 360 degrees at a cross point or inflection point at the two ends of the support or other parts as required to form a closed line eye 16. The closed line eye 16 can be woven at the two ends of the support, or can be Weaves in between the two. There may be one or more closed eyelets 16 on each segment. The closed wire eye 16 can be on the same outer contour curved surface or tangent plane with the support, can also be inward or outward on a plane (radial surface) perpendicular to the support, and can also be at any angle with the support. The curved wire turns 15 at the two ends of the support, and the closed wire eye 16 can be at the same level or at different levels.

After braiding the inner layer stent body 1, the same braided wire or different braided wires can be repeatedly braided from the braided wire starting point (such as 102 in Fig. 2) of the downstream port of the braided inner layer stent body. It is equivalent to wrapping around the bracket at an angle of about 60 degrees (for example, reaching 104 in Figure 2), let the braided wire break away from the braided inner bracket body, protrude outward and wind it into a tongue-like structure 2, and then turn to the opposite direction of symmetry Enter the inner layer of the stent and repeatedly weave (for example, enter from 105 in Figure 2). out of 106), protrude outwards and wind into another tongue-like structure 2, then turn to the opposite direction of symmetry and enter the inner support body to repeat weaving (for example, entering from 104 in Figure 2), until weaving into three evenly distributed The outer layer has a tongue-like structure, and the last section of braided wire enters the inner layer of the stent body and is braided again until it is close to the downstream port of the stent (for example, 107 in FIG. 2 ). When weaving the outer layer tongue-shaped structure, it is necessary to control the exit point of the braided wire from the inner layer support body and the entry point entering the inner layer support body on the same radial plane of the inner layer support body, and control the exit point and the entry point The distance between the points is equivalent to turning about 120 degrees around the stent, and the free edge of the control tongue structure is located at the junction of the upstream section and the middle section of the inner stent body. In the present invention, the number of deformable units on the same radial plane of the inner stent body 1 is braided as a multiple of three, which is beneficial to the uniform distribution of the three tongue-like structures along the radial direction of the inner stent body during weaving. The number of deformable units on the same radial plane of the inner layer stent body 1 shown in Figure 2 is 15, which is a multiple of 3, so that the distance between the exit point and the entry point of each tongue-shaped structure can be controlled to be 5 The deformable unit is equivalent to turning one-third of the circle around the bracket, and the three tongue-shaped structures can be evenly distributed.

When weaving the outer layer tongue-like structure 2, after the braided wire 101 stretches out from the inner layer support body 1, it can also be wound around a collar 108 of at least 360 degrees and then a half-ring. The radians are equivalent, and a part of the collar and the half ring together form a tongue-like structure. The collar 108 can be completely free from the inner stent, or it can be braided into the inner stent downstream of the inner stent, as shown in FIG. 2 .

When weaving the outer layer tongue-like structure 2, a small circle can also be wound around the arc top of its upstream end to form a closed thread eye. This structure is not shown in this embodiment.

When the stent of the present invention is braided, radio-opaque markers 6 can also be woven on different segments of the braided line as required and woven on different parts of the stent. At least one X-ray-opaque dot mark is provided at the downstream end of the stent. At least one X-ray-opaque dot mark is provided at the upstream end of the stent or at the junction of the upstream segment and the middle segment, and the position of these marks is close to the cup bottom of the valve leaflet.

In summary, the stent valve with tongue-shaped structure and the weaving method of the stent of the present invention have the following characteristics and advantages:

1. The whole bracket is composed of elastic braided wire 101 braided

A bracket composed of a single wire has strong integrity and is stronger mechanically without welding between wires. Individual line start and end points can be welded together or overlapped. Both ends of the braided wire of the single-wire stent are between the downstream section 13 and the middle section 12 of the stent. Both heads can be in one direction, upstream or downstream. A single elastic braided wire 101 can be wound into arcuate loops 15 and closed eyelets 16 . The closed line eye 16 can be on the same outer contour curved surface or tangent plane with the support, or can be inward or outward on a plane (diameter plane) perpendicular to the support, or can be between the two. The number of deformable units located in the same radial plane in the braided inner stent body 1 of the present invention is a multiple of three, which is conducive to the uniform distribution of the three valve leaflets and the three tongue-like structures. Sliding between adjacent segments of braided wire at the intersection point ensures radial compression and radial expansion of the stent and tongue-like structure.

2. There is an X-ray opaque mark on the inner stent body 1

The radiopaque markers can be located at the upstream end of the stent-valve, the downstream end and the junction of the valve leaflets.

3. The bracket 1 is provided with an outer tongue structure 2

The outer tongue 2 is a non-sealed membrane that allows blood to pass through. The tongue-like structure 2 cooperates with a specific stent pull wire on the delivery device, and can be independently expanded prior to the stent body. The expanded tongue-like structure 2 has positioning and fixation functions. The joint point of the tongue structure 2 and the leaflet joint point may have a certain rotation relationship, such as being on the same rotation plane.

4. The valve leaflet 3 is provided with reinforcing fibers 7

The reinforcing fibers 7 selectively increase the strength of the elastic synthetic material valve leaflet 3 and reduce the possibility of it being torn. Reinforcing fiber 7 makes the synthetic valve leaflet 3 annularly reinforced, without hindering the opening and closing of the valve leaflet; the free edge of the synthetic valve leaflet 3 is reinforced to prevent it from tearing; The joints become stronger and not torn; the joints become smoother to reduce thrombus formation.

5. The curved line bend 15 and closed line eye 16 on the inner support body 1 are conducive to increasing the radial elastic force and reducing material deformation; the reinforcing fiber 7 in the elastic synthetic film can be fixed on the curved line bend 15 and the closed line eye. Above the line eye 16; the closed line eye 16 can also fix the joint point of the valve leaflet. If the closed line eye 16 is turned 90 degrees to the inside and is perpendicular to the cutting plane, it can move the joint point inward and the tension of the valve leaflet decreases; the arc Shaped wire turning 15 and closed wire eye 16 are used for cooperating with delivery device, and stent valve is temporarily fixed, and is compressed on the inner tube of delivery device. If the bracket pull wire passes through the closed wire eye, it will not slip and move.

Claims (9)

1. a stent valve with a tongue-like structure, comprising a radially deformable tubular mesh stent, the mesh stent includes an upstream section, a middle section and a downstream section, and a plurality of meshes can be formed between each mesh wire of the mesh stent The deformation unit forms multiple arc-shaped turns at both ends of the mesh support, and is equipped with multiple closed wire eyes, multiple flexible coupling rings and multiple X-ray-opaque signs on the mesh support. The inner side of the middle section is connected with valve leaflets, and the inner side and/or outer side of the upstream section of the mesh stent is covered with a sealing film, and it is characterized in that: the mesh stent includes a circular tube or a circular tube with a radially protruding structure The inner layer stent body is connected with at least one tongue-shaped structure surrounded by mesh wires on the outside of the inner layer stent body, the outer layer tongue-shaped structure is preferably three, and the three outer layer tongue-shaped structures are along the inner layer stent body The radial and uniform corner distribution of each tongue-shaped structure is connected with the inner support body at the downstream section or the junction of the downstream section and the middle section to form a fixed edge, and extends from the fixed edge to the upstream section to the junction of the upstream section and the middle section to form Free edge; the valve leaflets are three, and the three valve leaflets are distributed with a 120-degree rotation angle. 2. The stent valve with tongue-shaped structure as claimed in claim 1, characterized in that: said outer tongue-shaped structure corresponds to the radially protruding structure of the inner layer in the axial direction and radial direction, and is arranged at the same rotation angle. 3. The stent valve with tongue-shaped structure as claimed in claim 1, characterized in that: the valve leaflets are axially and radially corresponding to the tongue-shaped structure, and are arranged to rotate horizontally and radially in the same axial direction angle. 4. A braiding method for a bracket with a tongue-like structure, characterized in that: set up a circular tube or a tube-shaped internal mold with a radially protruding structure, and use the elastic metal wire rod as the braiding line. The braiding points are as follows: A. Take the braided wire and start from the downstream port close to the stent, spirally wind along the outer contour of the inner mold, and then turn to the opposite direction of symmetry and spirally wind along the outer contour of the inner mold at the upstream port of the stent, and repeat until all All deformable units have been established and braided into a circular tube or a circular tube-shaped inner stent with a radially protruding structure; B. Repeat braiding from the same braided wire starting from the braided wire starting point at the downstream port of the braided inner stent body. After weaving to an angle equivalent to about 60 degrees around the stent, let the braided wire break away from the inner stent body and move outward Stretch out and wind into a tongue-like structure, then turn to the opposite direction of symmetry and enter the inner support body to repeat weaving. Stretch out and wind into a tongue-like structure, then turn to the opposite direction of symmetry and enter the inner support body to repeat weaving until three outer tongue-like structures are braided. downstream port; C. When weaving the outer layer tongue-shaped structure, control the exit point of the braided wire protruding from the inner layer support body and the entry point entering the inner layer support body on the same radial plane of the inner layer support body, and control the exit point and the entry point of the inner layer support body The distance between the entry points is equivalent to about one-third of the circle around the stent, and the free edge of the control tongue structure is located at the junction of the upstream section and the middle section of the inner stent body; D. The number of deformable units located on the same radial plane of the inner stent body is woven into a multiple of 3; E. Different line segments of the braided line form an up and down stagger point when they intersect, and the upper and lower positions of the same line segment at its adjacent stagger point are opposite, and the two line segments on the same stagger point can slide mutually; F. When weaving the inner stent body, the deformable unit formed by different line segments of the braided wire is a quadrilateral, and the braided wire forms an arc-shaped turn when the upstream port and the downstream port of the stent turn; G. When weaving the inner stent body, turn the braided wire at least 360 degrees at a cross point or inflection point at both ends of the stent or other parts to form a closed thread eye; H. When weaving the inner stent body, cover the braiding wires of different parts of the stent with X-ray-opaque signs as required, such as covering X-ray-opaque marks on the double-line segment or the double-line segment of the closed line eye Logo ring. 5. The method of braiding a stent with a tongue-like structure as claimed in claim 4, characterized in that: in the point B, after the braided wire protrudes from the inner stent body, it can also be wound around an at least 360-degree A half-ring is wound around the collar, the radian of the collar is equal to that of the half-ring, and a part of the collar and the half-ring together form a tongue-shaped structure. 6. the braiding method of the stent with tongue-shaped structure as claimed in claim 5, is characterized in that: described collar can be to break away from the full free state of inner layer stent body, also can be positioned at the downstream of inner layer stent body A portion of the segment is woven into the inner stent body. 7. The method of braiding a stent with a tongue-like structure as claimed in claim 4, characterized in that: in the point B, when the braided wire is wound into a tongue-like structure, it can also be wound at least 360 degrees at the top of the arc. Degree angle constitutes a closed line eye, and the double line segment of the closed line eye is covered with an X-ray-opaque marking ring. 8. The method for braiding a stent with a tongue-like structure as claimed in claim 4, characterized in that: in the point G, the closed thread eye can be woven into the same structure as the inner layer of the stent body or the outer layer of the tongue-like structure. On the curved surface of the outer contour, it can also be braided to be perpendicular to the inner stent body or the outer tongue-like structure or at any angle. 9 . The method for braiding a stent with a tongue-like structure according to claim 4 , wherein the tongue-like structure can also be braided by a braiding wire different from that of the inner stent body. 10 .

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