CN118000987A - Vascular stent and manufacturing method thereof - Google Patents

Abstract

The embodiment of the invention provides a vascular stent and a manufacturing method thereof, and relates to the field of medical appliances. The vascular stent comprises a first braiding wire and a second braiding wire, wherein part of the structures of the first braiding wire and the second braiding wire are braided to form a stent body, the stent body is of a single-layer cylindrical structure, the rest of the structures of the second braiding wire are bent to form an anchoring frame, the anchoring frame is arranged at the end part of the stent body, the diameter of the anchoring frame is gradually increased in the direction away from the stent body, the cross section area of the first braiding wire is smaller than that of the second braiding wire, one part of the stent body of the vascular stent is braided by filaments, one part of the stent body is braided by thick filaments, the purpose that the thick filaments are combined with the thin filaments is achieved, the thick filaments can play a very strong supporting role in a narrow blood vessel carrying an aneurysm, the thin filaments can ensure the flexibility of the vascular stent, and meanwhile, the anchoring frame of the vascular stent can play an anchoring role in the blood vessel and can bear the impact of blood flow without displacement.

Description

Vascular stent and manufacturing method thereof

Technical Field

The invention relates to the field of medical equipment, in particular to a vascular stent and a manufacturing method thereof.

Background

Intracranial aneurysms are one of the cerebrovascular diseases with extremely high mortality and disability rates. Intracranial aneurysms rupture, resulting in subarachnoid hemorrhage, which severely jeopardizes the patient's life and health.

In the prior art, the related support for the intracranial aneurysm cannot achieve both radial supporting force and flexibility, and is easily affected by blood flow impact to cause displacement, so that the use effect is not ideal.

Disclosure of Invention

The invention provides a vascular stent and a manufacturing method thereof, which can have radial supporting force and flexibility and can bear the impact of blood flow without displacement.

Embodiments of the invention may be implemented as follows:

In a first aspect, the present invention provides a vascular stent comprising:

a first braided wire; and

The second braided wire is braided by partial structures of the first braided wire and the second braided wire to form a bracket body, the bracket body is of a single-layer cylindrical structure, the rest of the second braided wire is bent to form an anchor frame, the anchor frame is arranged at the end part of the bracket body, and the diameter of the anchor frame is gradually increased in a direction away from the bracket body;

wherein the cross-sectional area of the first braided wire is smaller than the cross-sectional area of the second braided wire.

In an alternative embodiment, the number of the second braiding wires is one, and the head end of the second braiding wire is connected with the tail end of the second braiding wire.

In an alternative embodiment, the number of the anchoring frames is two, and the two anchoring frames are respectively positioned at two ends of the bracket body.

In an alternative embodiment, the second vascular stent further comprises a developing ring, and the developing ring is arranged on the anchoring frame.

In an alternative embodiment, the second braided filaments forming the stent body are used to contact the inner wall of a sheath.

In a second aspect, the present invention provides a method for manufacturing a vascular stent, the method comprising:

Braiding by adopting first braiding wires to form a filament tubular structure;

braiding a second braiding wire on the filament tubular structure to form a stent body;

forming an anchor at an end of the filament tubular structure using the second braided filaments;

wherein the diameter of the anchoring frame gradually increases in a direction away from the stent body, and the cross-sectional area of the first braided wire is smaller than that of the second braided wire.

In an alternative embodiment, the step of braiding with first braiding wires to form a filament tubular structure comprises:

forming a filament tubular structure by adopting a first braiding wire to braid through a braiding machine, wherein a second braiding wire braiding position is reserved in the filament tubular structure;

The step of braiding the second braiding wires on the filament tubular structure to form a stent body comprises the following steps:

and braiding the second braiding wires at the braiding positions of the second braiding wires of the filament tubular structure to form a stent body.

In an alternative embodiment, the step of braiding the filament tubular structure with a second braided wire to form a stent body and braiding the second braided wire with the second braided wire to form an anchor at an end of the filament tubular structure comprises;

continuously winding the second braided wires through a thick wire braiding tool to form the bracket body and the anchoring frame;

wherein the head end of the second braided wire is connected with the tail end of the second braided wire.

In an alternative embodiment, the thick wire braiding tool comprises a braiding mandrel, a first end expanding rod, a second end expanding rod, a first winding column and a second winding column, wherein the first end expanding rod and the second end expanding rod are respectively connected to two ends of the braiding mandrel, the first winding column and the second winding column are respectively arranged on the first end expanding rod and the second end expanding rod, and a positive spiral groove and a reverse spiral groove which are intersected are formed in the outer wall of the braiding mandrel;

The step of continuously winding the second braided wire by using a thick wire braiding tool to form the stent body and the anchoring frame comprises the following steps of:

winding one second braided wire to the first winding post at the first end expansion rod through the forward spiral groove, winding the second winding post at the second end expansion rod along the reverse spiral groove after bypassing the first winding post, and bypassing the second winding post to form the support body at the braiding mandrel, and forming one anchoring frame at the first end expansion rod and the second end expansion rod respectively.

In an alternative embodiment, a hollow groove is formed at the intersection of the forward spiral groove and the reverse spiral groove.

The vascular stent and the manufacturing method thereof have the beneficial effects that:

The invention provides a vascular stent, which comprises a first braiding wire and a second braiding wire, wherein part of structures of the first braiding wire and the second braiding wire are braided to form a stent body, the stent body is of a single-layer cylindrical structure, the rest of structures of the second braiding wire are bent to form an anchoring frame, the anchoring frame is arranged at the end part of the stent body, the diameter of the anchoring frame is gradually increased in the direction away from the stent body, wherein the cross section area of the first braiding wire is smaller than that of the second braiding wire, namely, one part of the stent body of the vascular stent is braided by filaments, and the other part of the stent body of the vascular stent is braided by thick filaments, so that the purpose of combining the thick filaments with the thin filaments is achieved, the thick filaments can play a strong supporting role in a narrow blood vessel carrying an aneurysm, the thin filaments can ensure the flexibility of the vascular stent, and meanwhile, the anchoring frame of the vascular stent can play an anchoring role in the blood vessel and can bear the impact of blood flow and not generate displacement.

The invention provides a manufacturing method of a vascular stent, which comprises the following steps: braiding by adopting first braiding wires to form a filament tubular structure; braiding a second braiding wire on the filament tubular structure to form a stent body; forming an anchor frame at the end part of the filament tubular structure by adopting second braided wires; the diameter of the anchoring frame is gradually increased in the direction away from the stent body, the cross-sectional area of the first braiding wire is smaller than that of the second braiding wire, that is, one part of the stent body of the vascular stent is braided by the filaments, the other part of the stent body of the vascular stent is braided by the thick wires, the purpose that the thick wires are combined with the filaments is achieved, the thick wires can play a very strong supporting role in a narrow blood vessel carrying an aneurysm, the filaments can ensure the flexibility of the vascular stent, and meanwhile, the anchoring frame of the vascular stent can play an anchoring role in the blood vessel and can bear the impact of blood flow without displacement.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vascular stent provided in an embodiment of the present invention;

FIG. 2 is a schematic view of a braiding machine provided in an embodiment of the present invention;

FIG. 3 is a schematic view of a filament tubular structure provided in an embodiment of the present invention;

FIG. 4 is a partial schematic view of a filament tubular structure provided in an embodiment of the present invention;

Fig. 5 is a schematic diagram of a thick yarn braiding tool provided in an embodiment of the present invention;

FIG. 6 is a schematic diagram of a second braided wire provided in an embodiment of the invention when braided on a thick wire braiding tool;

FIG. 7 is a partial schematic view of a second braided wire provided in an embodiment of the invention as it would be on a thick wire braided tool;

FIG. 8 is a schematic illustration of the head end of a second braided wire and the tail end connection of the second braided wire provided in an embodiment of the invention;

FIG. 9 is a schematic view of a composite mesh of stent body provided in an embodiment of the present invention;

FIG. 10 is a schematic view of a developer ring provided in an embodiment of the invention;

FIG. 11 is a schematic illustration of a vascular stent in a sheath provided in an embodiment of the present invention;

fig. 12 is a schematic view of a vascular stent positioned in a blood vessel according to an embodiment of the present invention.

Icon: 10-first braiding wires; 20-second braided filaments; 100-vascular stents; 110-a stent body; 120-anchoring frames; 130-developing ring; 111-a composite grid; 112-a filament tubular structure; 1121-a second braided wire braiding position; 200-sheath tube; 300-braiding machine; 301-outer spindle; 302-inner ingot; 400-thick silk braiding tooling; 450-braiding a mandrel; 401-forward helical groove; 402-reverse helical groove; 403-hollow grooves; 410-a first end expansion lever; 420-a second end expansion rod; 430-a first winding post; 440-a second winding post; 30-blood vessel; 31-aneurysms; 510-conveying the wire; 520-distal developer; 530-a first proximal development ring; 540-a second proximal developer ring.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Intracranial aneurysms are one of the cerebrovascular diseases with extremely high mortality and disability rates. Intracranial aneurysms rupture, resulting in subarachnoid hemorrhage, which severely jeopardizes the patient's life and health. If subarachnoid hemorrhage occurs, the mortality rate of untreated subarachnoid hemorrhage is approximately 50%, and the disability rate after treatment is as high as 60%. Hemodynamics is believed to be a major factor in intracranial aneurysm occurrence, progression and rupture. Reconstruction of the intracranial aneurysm-carrying artery, restoration of physiological blood flow dynamics in the aneurysm and carrying artery are endpoint targets for treating the intracranial aneurysm.

At present, the method for treating the intracranial aneurysm mainly comprises intervention of aneurysm coil embolism, aneurysm-carrying aneurysm arterial reconstruction, guiding and the like. With the continuous development of interventional materials, the aneurysm embolism technology is continuously improved, so that the safety and effectiveness of intracranial aneurysm interventional therapy are improved. The blood flow guiding device is a bracket with low mesh rate and high metal coverage rate, has hemodynamic and biological effects, can change the blood flow direction to promote blood flow siltation and thrombosis in the aneurysm, and further plays a role in repairing the carrying aneurysm by means of intimal transformation of tumor strength.

Since cerebral vessels are small and have a complicated shape, for example, a blood vessel in the cavernous sinus section of the carotid artery has a bending angle of 20 ° to 90 ° and a bending radius of 2mm to 4.5mm, the stent is required to have sufficient compliance to conform to the tortuous cerebral vessels. In the existing intracranial vascular stent technology, when a stent with small radial supporting force encounters a narrow aneurysm-carrying arterial vessel, the stent cannot support the vessel after being released, so that the blood flow pressure is increased. When the radial supporting force is ensured by the double-layer stent, the flexibility of the stent in a blood vessel is poor, a lesion part cannot be reached, and the friction force of the double-layer stent in a sheath tube is increased, that is, in the prior art, the radial supporting force and the flexibility cannot be considered for the related stent of the intracranial aneurysm, meanwhile, the situation of displacement is easily caused by the influence of blood flow impact, and the using effect is not ideal.

In view of this, please refer to fig. 1-12, a vascular stent 100 and a manufacturing method thereof according to an embodiment of the present invention can solve the problem, and a detailed description will be given below.

Referring to fig. 1, in an embodiment of the present invention, a vascular stent 100 is provided, the vascular stent 100 includes a first braided wire 10 and a second braided wire 20, a portion of the first braided wire 10 and a portion of the second braided wire 20 are braided to form a stent body 110, the stent body 110 is in a single-layer tubular structure, the rest of the second braided wire 20 is bent to form an anchor frame 120, the anchor frame 120 is disposed at an end of the stent body 110, and a diameter of the anchor frame 120 increases gradually in a direction away from the stent body 110.

The cross-sectional area of the first braided wire 10 is smaller than that of the second braided wire 20, that is, a part of the stent body 110 of the vascular stent 100 is braided by filaments, and the other part is braided by thick wires, so that the purpose of combining the thick wires with the thin wires is achieved, the thick wires can play a strong supporting role in the narrow blood vessel 30 carrying the aneurysm 31, the thin wires can ensure the flexibility of the vascular stent 100, and meanwhile, the anchoring frame 120 of the vascular stent 100 can play an anchoring role in the blood vessel 30 and can bear the impact of blood flow without displacement.

It should be noted that, the gradual increase of the diameter of the anchoring frame 120 in the direction away from the bracket body 110 may be understood that the anchoring frame 120 in this embodiment has a "bell mouth" shape, or may be understood that the space defined inside the anchoring frame 120 has a truncated cone shape.

In this embodiment, the number of the first braided wires 10 may be plural, and the number of the second braided wires 20 may be one, the head end of the second braided wires 20 and the tail end of the second braided wires 20 are connected, and at the same time, the number of the anchor frames 120 is two, and the two anchor frames 120 are respectively located at two ends of the stent body 110.

In the present application, the terms "proximal" and "distal" are terms commonly used in the medical field, specifically, "distal" means an end far from an operator during a surgical operation, and "proximal" means an end near the operator during the surgical operation.

In addition, the second vascular stent 100 further includes developing rings 130, the developing rings 130 are disposed on the anchoring frames 120, the number of the developing rings 130 may be plural, and part of the developing rings 130 are disposed on the proximal anchoring frames 120, for example, 2 to 8 developing rings 130 may be disposed on the proximal anchoring frames 120, and another part of the developing rings 130 may be uniformly disposed on the distal anchoring frames 120.

Wherein the second braided wire 20 for forming the stent body 110 is used to contact the inner wall of the sheath 200, so that the contact area between the outer wall of the entire stent body 110 and the sheath 200 can be reduced, and the friction of the stent 100 in the sheath 200 can be reduced.

In addition, in the embodiment of the present invention, a method for manufacturing the vascular stent 100 is further provided, so as to manufacture the vascular stent 100, where the method for manufacturing the vascular stent 100 includes:

Braiding with first braided filaments 10 to form a filament tubular structure 112 (shown in fig. 2);

Braiding the second braided filaments 20 over a filament tubular structure 112 to form a stent body 110;

Forming an anchor 120 at an end of the filament tubular structure 112 using the second braided filaments 20; wherein the diameter of the anchoring frame 120 is gradually increased in a direction away from the stent body 110, and the cross-sectional area of the first braided wire 10 is smaller than that of the second braided wire 20.

That is, the stent body 110 of the stent 100 is partially woven from filaments and partially woven from filaments, so that the purpose of combining the filaments with the filaments is achieved, the filaments can play a strong supporting role in the stenosed vessel 30 carrying the aneurysm 31, and the filaments can ensure the flexibility of the stent 100.

Meanwhile, the anchoring frame 120 of the vascular stent 100 can play an anchoring role in the blood vessel 30, and can bear the impact of blood flow without displacement.

Specifically, referring to fig. 2-4, the step of braiding the filament arrangement 112 using the first braiding wires 10 includes:

braiding with a braiding machine 300 using first braiding wires 10 to form a filament tubular structure 112, wherein the filament tubular structure 112 is reserved with second braiding wire braiding sites 1121;

The step of braiding the second braided filaments 20 over the filament tubular structure 112 to form a stent body 110 includes:

The stent body 110 is formed by braiding the second braided filaments 20 at the second braided filament braid locations 1121 of the filament tubular structure 112.

In this embodiment, the filament tubular structure 112 may be understood as a tubular structure formed by intersecting and braiding a plurality of first braided filaments 10, where filament grid units (shown in fig. 4) are uniformly distributed throughout the filament tubular structure 112 in the axial direction and the circumferential direction, the filament grid units are composed of n×n single grids, n is 4-10, and a second braided filament braiding position 1121 (shown in fig. 3) is located between each adjacent filament grid unit.

The diameter of the first braided wire 10 in this embodiment may be in the range of 0.01-0.06mm.

In this embodiment, the outer spindles 301 of the knitting machine 300 are uniformly circumferentially devoid of the first filaments 10 at every n+1 spindles, while the inner spindles 302 are uniformly circumferentially devoid of the first filaments 10 at every n+1 spindles. The outer spindle 301 rotates in a clockwise direction and the inner spindle 302 rotates in a counter-clockwise direction, thereby effecting braiding of the filament-tubular structure 112.

In addition, referring to fig. 5 to 8, in the present embodiment, for facilitating the braiding of the second braided wire 20, the steps of braiding the second braided wire 20 on the filament-shaped tubular structure 112 to form the stent body 110 and braiding the second braided wire 20 on the end of the filament-shaped tubular structure 112 to form the anchor 120 include;

One second braided wire 20 is continuously wound through the thick wire braiding tool 400 to form the stent body 110 and the anchor frame 120, wherein the head end of the second braided wire 20 is connected to the tail end of the second braided wire 20.

Specifically, the second braided wire 20 is manually wound by a thick wire braiding tool 400, and the thick wire braiding tool 400 includes a braiding mandrel 450, a first end expanding rod 410, a second end expanding rod 420, a first winding post 430 and a second winding post 440, wherein the first end expanding rod 410 and the second end expanding rod 420 are respectively connected to both ends of the braiding mandrel 450, and the first winding post 430 and the second winding post 440 are respectively arranged on the first end expanding rod 410 and the second end expanding rod 420.

It should be noted that, in order to facilitate the formation of the anchoring frame 120 into a "bell mouth" shape, in this embodiment, the end of the first end expansion rod 410 near the braiding mandrel is in a truncated cone shape, and the end of the second end expansion rod 420 near the braiding mandrel is also in a truncated cone shape.

The number of the first winding posts 430 and the second winding posts 440 is plural, and the plurality of the first winding posts 430 and the plurality of the second winding posts 440 are respectively wound around the first end expansion rod 410 and the second end expansion rod 420.

The outer wall of the braiding mandrel is provided with a plurality of forward spiral grooves 401 and a plurality of reverse spiral grooves 402 which are intersected, wherein the groove widths of the forward spiral grooves 401 and the reverse spiral grooves 402 are 1.2-2.5 times of the diameters of the second braiding wires 20.

Wherein, the steps of continuously winding through the thick wire braiding tooling 400 using one second braided wire 20 to form the stent body 110 and the anchor frame 120 include:

As shown in fig. 6, one second braided wire 20 is wound to a first winding post 430 at the first end expansion rod 410 via a forward spiral groove 401, wound around the first winding post 430 to a second winding post 440 at the second end expansion rod 420 along a reverse spiral groove 402, and wound around the second winding post 440 until all second braided wire braiding points 1121 and all first and second winding posts 430 and 440 are wound to form a stent body 110 at a braiding mandrel, and one anchor frame 120 is formed at the first and second end expansion rods 410 and 420, respectively.

As shown in fig. 8, after the weaving of the second weaving wires 20 is completed, the head end of the second weaving wires 20 and the tail end of the second weaving wires 20 are connected together by laser welding, and the weaving of the thick wire portion of the stent body 110 and the formation of the anchor frame 120 can be completed by only one second weaving wire 20, so that the process is simple and the cost is saved.

The filament tubular structure 112 is disposed on the braiding mandrel before the thick filament braiding tool 400 winds the second braided filaments 20.

It should be noted that, for convenience, the second braided wire 20 is wound on the thick wire braiding tool 400, and the second braided wire 20 is cross-braided at the intersection of the forward spiral groove 401 and the reverse spiral groove 402 in a manual manner, in this embodiment, a hollowed groove 403 is provided at the intersection of the forward spiral groove 401 and the reverse spiral groove 402, and the depth of the hollowed groove 403 is 2-3 times the diameter of the second braided wire 20.

For example, as shown in fig. 7, the second braided wire 20 passing through the forward spiral groove 401 is pressed against the second braided wire 20 passing through the reverse spiral groove 402 at the hollowed groove 403, and then, the second braided wire 20 passing through the forward spiral groove 401 is pressed under the second braided wire 20 passing through the reverse spiral groove 402 at the hollowed groove 403, continuing along the path of the forward spiral groove 401.

In the present embodiment, the diameter of the second braided wire 20 is 2 to 4 times the diameter of the first braided wire 10.

As shown in fig. 9, after the weaving of the first woven wire 10 and the second woven wire 20 is completed, the entire stent body 110 forms a plurality of conforming grids, the composite grids 111 are uniformly distributed along the axial direction and the circumferential direction of the stent body 110, and each composite grid 111 is formed by weaving n+1 fine warp yarns (the first woven wire 10 extending in the lower left to upper right direction) and n+1 fine weft yarns (the first woven wire 10 extending in the lower right to upper left direction), and two thick warp yarns (the second woven wire 20 extending in the lower left to upper right direction) and two thick weft yarns (the second woven wire 20 extending in the lower left to upper right direction). The second braided wire 20 can improve the radial supporting force, and the first braided wire 10 can keep the support flexible.

Referring to fig. 10, the method for manufacturing the intravascular stent 100 further includes: a developing ring 130 is mounted on the anchor 120.

According to the vascular stent 100 provided in the present embodiment, the vascular stent 100 operates according to the following principle:

It should be noted that the stent 100 may be delivered to the vessel 30 carrying the aneurysm 31 in combination with a delivery system, and the stent 100 may block the impact of blood flow into the lumen of the aneurysm due to the high metal coverage.

Referring to fig. 11, the distal end of the stent 100 is loaded into the sheath 200 by pressing and holding, the distal developing member 520 (i.e., the distal developing ring 130) of the delivery system passes through the stent 100, the distal developing member 520 is connected with the delivery wire 510, and the first proximal developing ring 530 of the delivery system is continuously pushed distally, so that the developing ring 130 at the proximal end of the stent 100 is retracted into the sheath 200.

In addition, a second proximal developing ring 540 is further connected to the delivery wire 510, and the second developing ring is located inside the stent body 110, and since the diameter of the second proximal developing ring 540 is larger than the diameter of the proximal anchoring frame 120 of the vascular stent 100 contracted in the sheath 200, the vascular stent 100 is retracted by pushing the proximal anchoring frame 120 of the vascular stent 100 by means of the end face of the second proximal developing ring 540 of the delivery system, so as to realize the function of reciprocating pushing and pulling of the vascular stent 100 in the sheath 200.

Wherein, as the contact area of the stent body 110 of the stent 100 and the inner surface of the sheath 200 is reduced, the frictional force of the stent 100 in the sheath 200 is also reduced.

As shown in fig. 12, in the blood vessel 30, when the developing ring 130 on the distal anchor 120 of the blood vessel stent 100 passes the neck of the aneurysm 31, the sheath 200 is retracted, the blood vessel stent 100 releases a portion, and it is checked whether the distal anchor 120 of the blood vessel stent 100 has passed the neck of the aneurysm for a distance, and whether the distal anchor 120 of the blood vessel stent 100 is anchored in the blood vessel 30.

If the release position is not effective, the delivery system may be retracted and the stent 100 may be withdrawn into the sheath 200 for a second positioning release. Due to the low mesh rate of the stent 100, blood films form within the blood mesh, and blood flows distally along the proximal end of the stent 100, preventing blood flow to the aneurysm 31. The anchoring frames 120 at both ends of the stent 100 can be anchored in the vessel 30 to resist the impact of blood flow and not to be displaced, thereby achieving the purpose of treating the aneurysm 31.

In summary, the vascular stent 100 includes the first braided wire 10 and the second braided wire 20, the partial structures of the first braided wire 10 and the second braided wire 20 are braided to form the stent body 110, the stent body 110 is in a single-layer tubular structure, the rest of the second braided wire 20 is bent to form the anchor frame 120, the anchor frame 120 is disposed at the end of the stent body 110, and the diameter of the anchor frame 120 is gradually increased in a direction away from the stent body 110, wherein the cross-sectional area of the first braided wire 10 is smaller than the cross-sectional area of the second braided wire 20.

That is, the stent body 110 of the stent 100 is partially woven from filaments, and partially woven from thick filaments, so that the purpose of combining thick filaments with filaments is achieved, the thick filaments can play a strong supporting role in the stenosed vessel 30 carrying the aneurysm 31, the filaments can ensure the flexibility of the stent 100, and at the same time, the anchoring frame 120 of the stent 100 can play an anchoring role in the vessel 30, and can bear the impact of blood flow without displacement.

Therefore, the vascular stent 100 has better radial supporting force and compliance, reduces the friction force of the vascular stent 100 moving in the sheath 200, and improves the radial supporting force of the whole vascular stent 100 by braiding part of the vascular stent 100 by thick wires, so that the vascular stent 100 has better adherence and can bear the impact of blood flow without displacement.

The manufacturing method of the vascular stent 100 comprises the following steps: braiding with first braiding wires 10 to form a filament tubular structure 112; braiding the second braided filaments 20 over a filament tubular structure 112 to form a stent body 110; forming an anchor 120 at an end of the filament tubular structure 112 using the second braided filaments 20; the diameter of the anchoring frame 120 increases gradually in a direction away from the stent body 110, the cross-sectional area of the first braided wire 10 is smaller than that of the second braided wire 20, a part of the stent body 110 of the vascular stent 100 is braided by filaments, and the other part of the stent body is braided by thick wires, so that the purpose of combining the thick wires and the thin wires is achieved, the thick wires can play a very strong supporting role in the narrow blood vessel 30 carrying the aneurysm 31, the thin wires can ensure the flexibility of the vascular stent 100, and meanwhile, the anchoring frame 120 of the vascular stent 100 can play an anchoring role in the blood vessel 30 and can bear the impact of blood flow without displacement.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A vascular stent, comprising:

a first braided wire; and

The second braided wire is braided by partial structures of the first braided wire and the second braided wire to form a bracket body, the bracket body is of a single-layer cylindrical structure, the rest of the second braided wire is bent to form an anchor frame, the anchor frame is arranged at the end part of the bracket body, and the diameter of the anchor frame is gradually increased in a direction away from the bracket body;

wherein the cross-sectional area of the first braided wire is smaller than the cross-sectional area of the second braided wire.

2. The vascular stent of claim 1, wherein the number of second braided wires is one, and wherein a head end of the second braided wires is connected to a tail end of the second braided wires.

3. The vascular stent of claim 1, wherein the number of anchoring frames is two, and two anchoring frames are respectively positioned at two ends of the stent body.

4. The vascular stent of claim 1, wherein the second vascular stent further comprises a visualization loop disposed on the anchor frame.

5. The vascular stent of claim 1, wherein the second braided wire forming the stent body is configured to contact a sheath inner wall.

6. A method for manufacturing a vascular stent, comprising the steps of:

Braiding by adopting first braiding wires to form a filament tubular structure;

braiding a second braiding wire on the filament tubular structure to form a stent body;

forming an anchor at an end of the filament tubular structure using the second braided filaments;

wherein the diameter of the anchoring frame gradually increases in a direction away from the stent body, and the cross-sectional area of the first braided wire is smaller than that of the second braided wire.

7. The method of manufacturing a vascular stent of claim 6, wherein the step of braiding the first braided wire to form a filament tubular structure comprises:

forming a filament tubular structure by adopting a first braiding wire to braid through a braiding machine, wherein a second braiding wire braiding position is reserved in the filament tubular structure;

The step of braiding the second braiding wires on the filament tubular structure to form a stent body comprises the following steps:

and braiding the second braiding wires at the braiding positions of the second braiding wires of the filament tubular structure to form a stent body.

8. The method of manufacturing a vascular stent of claim 7, wherein the step of braiding a stent body over the filament-like structure with the second braided wire and forming an anchor at an end of the filament-like structure with the second braided wire comprises;

continuously winding the second braided wires through a thick wire braiding tool to form the bracket body and the anchoring frame;

wherein the head end of the second braided wire is connected with the tail end of the second braided wire.

9. The method according to claim 8, wherein the thick wire braiding tool comprises a braiding mandrel, a first end expanding rod, a second end expanding rod, a first winding column and a second winding column, the first end expanding rod and the second end expanding rod are respectively connected to two ends of the braiding mandrel, the first winding column and the second winding column are respectively arranged on the first end expanding rod and the second end expanding rod, and the outer wall of the braiding mandrel is provided with a forward spiral groove and a reverse spiral groove which are intersected;

The step of continuously winding the second braided wire by using a thick wire braiding tool to form the stent body and the anchoring frame comprises the following steps of:

winding one second braided wire to the first winding post at the first end expansion rod through the forward spiral groove, winding the second winding post at the second end expansion rod along the reverse spiral groove after bypassing the first winding post, and bypassing the second winding post to form the support body at the braiding mandrel, and forming one anchoring frame at the first end expansion rod and the second end expansion rod respectively.

10. The method of claim 9, wherein the intersection of the forward and reverse helical grooves is provided with a hollowed-out groove.