Support

Abstract

The stent comprises a proximal section stent, a middle section stent and a telecentric section stent which are distributed in the axial direction, and the middle section stent comprises a plurality of stent rings; the fixed connecting pipe is fixedly connected with the bracket ring; the first axial connecting piece penetrates through the fixed connecting pipe and is fixedly connected with the fixed connecting pipe; the movable connecting pipe is movably connected with the bracket ring; and the second axial connecting piece penetrates through the movable connecting pipe and is movably connected with the movable connecting pipe. When the stent is implanted into a narrow true lumen, connecting lines or other structures protruding towards the interior of the lumen do not exist, use of other interventional instruments is not affected, follow-up interventional operations are not affected, the axial connecting piece is subjected to bending shaping treatment, the natural form is a bent shape attached to the blood vessel form, the whole stent is in a bent shape, and the stent is not prone to deformation. Therefore, the acting force on the blood vessel is small, and the damage to the blood vessel after implantation is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of vascular stents, and in particular relates to a stent. Background Art

[0002] Aortic dissection (AD) refers to a disease in which the middle layer of the aorta is destroyed due to bleeding in the aortic wall, resulting in the separation of the vascular wall layers, and the subsequent formation of true lumens or false lumens that are interconnected or not. In most cases, aortic dissection begins with an intimal tear, and blood enters the middle layer through the intimal tear, eventually leading to aortic rupture or re-entering the true lumen through a second intimal tear. Many factors, such as hypertension, atherosclerosis, and severe trauma, may lead to the occurrence of aortic dissection.

[0003] At present, for aortic dissection involving important branch arteries, there are the following repair methods: implanting an endovascular prosthesis with covered stents at both ends and a bare stent in the middle, the bare stent is composed of multiple stent rings connected by connecting lines between the stent rings, and the middle bare stent part of the endovascular prosthesis is aligned with the branch artery. This repair method has the following problems: since the treatment is for dissection lesions, there is often a narrow true lumen. When the bare stent without a coating in the middle part is in the narrow true lumen, its connecting line will bulge into the lumen. When other interventional devices are used in this area, other interventional devices may interfere with the connecting line protruding in the lumen, causing the stent to shift, and may also cause other interventional devices to be unable to be used normally; since the stent without a coating in the middle part lacks an axial support structure, the stent is prone to axial shortening, which will reduce the range of blood vessels covered by the stent and affect the effect of vascular reconstruction; since the stent is a straight cylinder in its natural state, when it is implanted in a curved blood vessel, it will have a certain force on the blood vessel, which may cause damage to the blood vessel. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a stent so that when the stent is implanted into a narrow true lumen, there are no connecting lines or other structures protruding into the lumen, and the use of other interventional devices will not be affected. The stent conforms to the morphology of the blood vessel, and after being implanted into the blood vessel, the force acting on the blood vessel is small, resulting in little damage to the blood vessel.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a stent, comprising: a proximal stent, a middle stent and a distal stent distributed along the axial direction, wherein the middle stent comprises:

[0006] multiple stent rings;

[0007] A fixed connecting pipe, wherein the fixed connecting pipe is fixedly connected to the bracket ring;

[0008] a first axial connecting member, the first axial connecting member passing through the fixed connecting pipe and fixedly connected to the fixed connecting pipe;

[0009] An active connection tube, the active connection tube being movably connected to the support ring;

[0010] A second axial connecting member passes through the movable connecting tube and is movably connected to the movable connecting tube.

[0011] In one embodiment of the present invention, the proximal segment stent and the distal segment stent are covered with a coating, and the middle segment stent is at least partially not covered with a coating.

[0012] In one embodiment of the present invention, the stent rings at both ends of the middle segment stent are respectively connected to the coatings covering the proximal segment stent and the distal segment stent.

[0013] In one embodiment of the present invention, two ends of the axial connector are respectively connected to the coating covering the proximal segment stent and the distal segment stent.

[0014] In one embodiment of the present invention, the stent ring is made of nickel-titanium alloy.

[0015] In one embodiment of the present invention, when the cross-section of the metal wire making the bracket ring is circular, the diameter of the metal wire is 0.1mm to 1mm; when the cross-section of the metal wire making the bracket ring is square, the diagonal length of the cross-section of the metal wire is 0.1mm to 1mm.

[0016] In one embodiment of the present invention, the fixed connecting tube and the movable connecting tube are hollow tubular structures, and the cross-sectional area of ​​their inner cavities is larger than the sum of the cross-sectional areas of the first axial connecting member or the second axial connecting member and the metal wire making the stent ring.

[0017] In one embodiment of the present invention, the fixed connecting tube and the movable connecting tube are made of nickel-titanium alloy or 316L stainless steel, and the wall thickness thereof is 0.05 mm to 0.2 mm.

[0018] In one embodiment of the present invention, the first axial connecting member and the second axial connecting member are made of nickel-titanium alloy.

[0019] In one embodiment of the present invention, the first axial connecting member and the second axial connecting member are configured as bendable and shapeable structures.

[0020] The present invention proposes a stent, in which each stent ring in a middle section stent is connected by a connecting tube and an axial connecting piece on the stent ring, the connection at the large bend is a fixed connection, which can ensure that the large bend of the middle section stent has no axial shortening, and the connection at the non-large bend is an axially movable connection, which can ensure the bending performance of the middle section stent. This connection method will not have any bulge into the lumen even in a narrow lumen, and will not affect subsequent interventional surgery. The axial connecting piece is subjected to a bending shaping process to make the stent as a whole curved, which better fits the shape of the blood vessel and reduces damage to the blood vessel after implantation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 A schematic front view of a bracket in one embodiment of the present invention

[0023] Figure 2 FIG. 1 is a schematic diagram of delivering a stent in a compressed state to the aortic arch region according to one embodiment of the present invention.

[0024] Figure 3 FIG. 1 is a schematic diagram of the aortic arch region after reconstruction is completed in one embodiment of the present invention.

[0025] Description of labels:

[0026] 100. Stent; 10. Proximal segment stent; 20. Middle segment stent; 30. Distal segment stent; 101. Stent ring; 102. Covering; 21. Fixed connecting tube; 22. First axial connecting piece; 23. Active connecting tube; 24. Second axial connecting piece; 103. Branch vessel region. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] See also Figure 1 As shown, the present invention proposes a stent, so that when the stent is implanted into a narrow true lumen, there is no connection line or other structure protruding into the lumen, which will not affect the use of other interventional devices, and it fits the morphology of the blood vessel. After being implanted into the blood vessel, the force acting on the blood vessel is small, and the damage to the blood vessel is small. Specifically, the stent 100 includes a proximal segment stent 10, an intermediate segment stent 20, and a distal segment stent 30 respectively along the axial direction, wherein when the proximal segment stent 10 is in a compressed state, it can facilitate the transportation of the stent 100 in the blood vessel, and when the proximal segment stent 10 is in a released state, it can maintain the hollow cylindrical shape of the stent 100, stably anchor the stent 100 on the inner wall of the blood vessel, prevent the displacement of the stent 100 in the blood vessel, and ensure that the blood flow flows smoothly in the lumen of the stent 100 and that the blood flow does not seep to the outside of the coating, thereby achieving the effect of blocking the interlayer rupture; when the intermediate segment stent 20 is in a compressed state, it can facilitate the transportation of the stent 100 in the blood vessel, and when the intermediate segment stent 2 ... facilitate the transportation of the stent 100 in the When the distal segment 30 of the stent is in a compressed state, the stent 100 can be transported in the blood vessel conveniently. When the distal segment stent 30 is in a released state, the hollow cylindrical shape of the stent 100 can be maintained, and the stent 100 can be stably anchored on the inner wall of the blood vessel to prevent the stent 100 from shifting in the blood vessel, and the blood flow can be ensured to flow smoothly in the lumen of the stent 100 and to prevent the blood flow from seeping to the outside of the coating, thereby achieving the effect of sealing the rupture of the dissection.

[0030] See also Figure 1 As shown, in this embodiment, the proximal segment stent 10 and the distal segment stent 30 are composed of a plurality of stent rings 101 and a coating 102 covering the stent rings 101, wherein the stent rings 101 are a wavy or grid-shaped closed frame, and the coating 102 is a layer of flexible columnar film material attached to the stent rings 101 by suturing or bonding. The proximal segment stent 10 and the distal segment stent 30 are in the shape of a hollow thin-walled cylinder, and the stent rings 101 are attached to the outside or inside of the columnar coating by suturing or bonding.

[0031] See also Figure 1As shown, in this embodiment, the middle section bracket 20 includes a plurality of bracket rings 101, a fixed connecting tube 21, a first axial connecting member 22, a movable connecting tube 23 and a second axial connecting member 24. The fixed connecting tube 21 is fixedly connected to the bracket ring 101, and the first axial connecting member 22 passes through the fixed connecting tube 21 and is fixedly connected to the fixed connecting tube 21, for example, the fixed connection method may be laser welding or crimping; the movable connecting tube 23 is movably connected to the bracket ring 101, and the second axial connecting member 24 passes through the movable connecting tube 23 and is movably connected to the movable connecting tube 23. The movable connecting tube 23 will limit the second axial connecting member 24 and the bracket ring 101 to only perform relative movement in the axial direction of the bracket 100. It can be understood that the stent 100 can be bent, and the fixed connecting tube 21 and the first axial connecting member 22 are located on the large bend side when the stent 100 is bent, and the movable connecting tube 23 and the second axial connecting member 24 are located on the non-large bend side when the stent 100 is bent. The connection at the large bend is a fixed connection, which can ensure that the large bend of the middle section stent 20 has no axial shortening, and the connection at the non-large bend is an axial movable connection, which can ensure the bending performance of the middle section stent 20. This connection method will not have any bulge into the lumen even in a narrow lumen, and will not affect subsequent interventional surgery.

[0032] See also Figure 1 As shown, in this embodiment, the stent rings 101 at both ends of the intermediate stent 20 can be connected to the coating 102 covered by the proximal stent 10 and the distal stent 30, respectively, so as to realize the intermediate stent 20 and the proximal stent 10 and the distal stent 30. Of course, the ends of the first axial connector 22 and the second axial connector 24 can also be connected to the coating 101 covered by the proximal stent 10 and the distal stent 30, respectively, so as to realize the intermediate stent 20 and the proximal stent 10 and the distal stent 30. It can also be understood that the intermediate stent 20 is at least partially not covered with a coating, and the intermediate stent 20 can be partially covered with a columnar coating, but the covered area should not include the area of ​​the branch blood vessels to prevent the coating from blocking blood flow.

[0033] See also Figure 1As shown, in this embodiment, the stent ring 101 described in the above embodiment is made of metal or polymer material, preferably, nickel-titanium alloy is used. When the cross-section of the metal wire making the stent ring is circular, the diameter of the metal wire is 0.1mm to 1mm, and when the cross-section of the metal wire making the stent ring is square, the diagonal length of the cross-section of the metal wire is 0.1mm to 1mm. Of course, the stent ring 101 can be a cut stent, that is, the cross-section of the metal wire made by laser cutting metal pipe is square. The stent ring 101 can be located on the inside or outside of the columnar coating 102, and the stent ring 101 can be partially or completely attached to the columnar coating 102. Preferably, the stent ring 101 is partially attached to the columnar coating 102. The columnar coating 102 is a layer of flexible columnar film material attached to the stent ring 101 by suturing or bonding, which can be made of materials such as polyester fiber or expanded polytetrafluoroethylene. Preferably, its connection method adopts suturing and the material adopts polyester fiber.

[0034] See also Figure 1 As shown, in this embodiment, the fixed connecting tube 21 and the movable connecting tube 23 are hollow tubular thin-walled structures, and the inner cavity can be circular or elliptical. The cross-sectional area of ​​the inner cavity needs to include the cross-sectional area of ​​the metal wire used to make the stent ring 101 and the cross-sectional area of ​​the axial connector, that is, the cross-sectional area of ​​the inner cavity is greater than the sum of the cross-sectional areas of the first axial connector 21 or the second axial connector 24 and the metal wire used to make the stent ring 101. The material is preferably nickel-titanium alloy or 316L stainless steel, and the wall thickness is 0.05mm to 0.2mm. The first axial connector 22 and the second axial connector 24 are cylindrical structures, and the material is metal or polymer, preferably, nickel-titanium alloy, and the first axial connector 22 and the second axial connector 24 are configured as bendable and shaped structures, that is, the first axial connector 22 and the second axial connector 24 are shaped to make the stent 100 bend as a whole, more in line with the shape of the aorta, and reduce damage to the blood vessel after implantation.

[0035] See also Figure 1 As shown, in this embodiment, even if the stent 100 described in the above embodiments is implanted in a narrow true lumen, there is no structure protruding into the lumen; at the same time, the stent 100 has an axial support structure to prevent the stent from axial shortening; the natural shape of the stent is curved, which better fits the shape of the blood vessel and reduces damage to the blood vessel.

[0036] In this embodiment, reconstruction of the aorta with branches can be roughly divided into the following two steps. Here, for the convenience of description, the aortic arch area is selected as the area to be reconstructed:

[0037] See also Figure 2As shown, the stent 100 in a compressed state is delivered to the aortic arch region, and the middle section stent 20 is aligned to the branch vessel region 103 .

[0038] See also Figure 3 As shown, the stent 100 is released. After the release, the proximal stent 10 is located in the ascending aorta, the middle stent 20 is located in the aortic arch, and the distal stent 30 is located in the descending aorta. The stent portion with the coating blocks the rupture of the aorta, while the portion corresponding to the branch blood vessel is not coated, so the blood flow in the branch blood vessel can be maintained unobstructed.

[0039] The present invention proposes a stent, in which each stent ring in the middle section stent is connected by a connecting tube and an axial connecting piece on the stent ring, the connection at the large bend is a fixed connection, which can ensure that the large bend of the middle section stent has no axial shortening, and the connection at the non-large bend is an axially movable connection, which can ensure the bending performance of the middle section stent. Even when the stent is implanted in a narrow true cavity, this connection method will not have any connecting lines or other structures protruding into the lumen, will not affect the use of other interventional instruments, and will not affect subsequent interventional surgeries. Moreover, the axial connecting piece is subjected to a bending shaping process, and its natural shape is a curved shape that fits the shape of the blood vessel. The stent is curved as a whole, which better fits the shape of the blood vessel, has a small force on the blood vessel, and reduces damage to the blood vessel after implantation.

[0040] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, such as a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0041] Except for the technical features in the specification, the other technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the other technical features will not be described in detail here.

Claims

1. A bracket, characterized in that: include: A proximal section bracket, a middle section bracket and a distal section bracket are distributed along the axial direction, and the middle section bracket includes: multiple stent rings; A fixed connecting pipe, wherein the fixed connecting pipe is fixedly connected to the bracket ring; a first axial connecting member, the first axial connecting member passing through the fixed connecting pipe and fixedly connected to the fixed connecting pipe; An active connection tube, the active connection tube being movably connected to the support ring; A second axial connecting member passes through the movable connecting tube and is movably connected to the movable connecting tube.

2. The bracket according to claim 1, characterized in that: The proximal segment stent and the distal segment stent are covered with a coating, and the middle segment stent is at least partially not covered with a coating.

3. The bracket according to claim 2, characterized in that: The stent rings at both ends of the middle segment stent are respectively connected to the covering films covering the proximal segment stent and the distal segment stent.

4. The bracket according to claim 2, characterized in that: Both ends of the first axial connector and the second axial connector are respectively connected to the coatings covering the proximal segment stent and the distal segment stent.

5. The bracket according to claim 1, characterized in that: The support ring is made of nickel-titanium alloy.

6. The bracket according to claim 1, characterized in that: When the cross section of the metal wire used to make the bracket ring is circular, the diameter of the metal wire is 0.1 mm to 1 mm; when the cross section of the metal wire used to make the bracket ring is square, the diagonal length of the cross section of the metal wire is 0.1 mm to 1 mm.

7. The bracket according to claim 1, characterized in that: The fixed connecting tube and the movable connecting tube are hollow tubular structures, and the cross-sectional area of ​​the inner cavity thereof is larger than the sum of the cross-sectional areas of the first axial connecting member or the second axial connecting member and the metal wire making the stent ring.

8. The bracket according to claim 1, characterized in that: The fixed connecting tube and the movable connecting tube are made of nickel-titanium alloy or 316L stainless steel, and the wall thickness thereof is 0.05 mm to 0.2 mm.

9. The bracket according to claim 1, characterized in that: The first axial connecting member and the second axial connecting member are made of nickel-titanium alloy.

10. The bracket according to claim 1, characterized in that: The first axial connecting member and the second axial connecting member are configured as bendable and shapeable structures.

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