Intravascular stent

Abstract

The utility model provides an intravascular stent which comprises supporting units, a plurality of supporting units are encircled to form a supporting group, and each supporting unit extends in the axial direction to form the intravascular stent; the supporting unit comprises a first supporting part and a second supporting part which are symmetrically arranged, and the joint of the first supporting part and the second supporting part can be kept in a compressed state when the intravascular stent enters a target position and can be in an unfolded state after being released at the target position; the first supporting part and the second supporting part are both composed of a plurality of first supporting rods, second supporting rods and connecting rods, and a folding unit is formed at the connecting position of the first supporting part and the second supporting part. The treatment effect of the implanted stent is improved, and complications are reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a vascular stent. Background Technology

[0002] With the improvement of people's living standards, the incidence of diseases such as hypertension, hyperlipidemia, and diabetes has increased significantly, and the incidence of large artery diseases such as aneurysm and aortic dissection has also increased significantly.

[0003] Currently, with the continuous improvement and popularization of endovascular repair technology for arterial diseases, many companies at home and abroad have developed many types of covered stents for use in aneurysms in different parts of the artery (ascending aorta, aortic arch aneurysm, thoracic aortic aneurysm, abdominal aortic aneurysm, iliac artery aneurysm, etc.). At the same time, aortic dissections in different locations (ascending aortic dissection, aortic arch aneurysm, thoracic aortic dissection, abdominal aortic dissection, iliac artery dissection, etc.) can also be applied.

[0004] However, the following problems have been found in the clinical application and follow-up of these products: Before implanting a vascular stent, since the diameter of the current stent in its compressed loading state is relatively large, it is necessary to fully consider whether it matches the diameter of the access vessel. If the access vessel is severely calcified or the diameter of the access vessel is smaller than the diameter of the vascular stent in its compressed loading state, balloon dilation or vascular dilation sheaths or other auxiliary tools need to be used before implantation, or a larger access vessel needs to be selected. This can easily increase the risk of surgery, prolong the operation time and the incidence of complications, and increase the possibility of surgical failure. In addition, the use of tools for dilation can cause certain damage to the blood vessels. Utility Model Content

[0005] This invention provides a vascular stent that can effectively solve the above-mentioned problems.

[0006] This utility model is implemented as follows:

[0007] This utility model provides a vascular stent, comprising: a support unit, wherein multiple support units are arranged in a surrounding manner to form a support group, and each support unit extends axially to form a vascular stent; the support unit includes a first support portion and a second support portion symmetrically arranged, wherein the connection between the first support portion and the second support portion can be kept in a compressed state when the vascular stent enters the target position, and can be in an unfolded state after being released at the target position; both the first support portion and the second support portion are composed of a plurality of first support rods, second support rods and connecting rods, and a folding unit is formed at the connection between the first support portion and the second support portion.

[0008] As a further improvement, the connection between the first support and the second support is provided with a W-shaped folding unit at the upper end and a W-shaped folding unit at the lower end.

[0009] As a further improvement, a connecting rod is provided between the folding unit at the upper end and the folding unit at the lower end.

[0010] As a further improvement, the connection between the first support and the second support is provided with an upper W-shaped folding unit and a lower M-shaped folding unit.

[0011] As a further improvement, the fixing part includes a positioning unit disposed on the support unit between two adjacent first support rods.

[0012] As a further improvement, the fixing part also includes a coating layer sewn to the support unit.

[0013] The beneficial effects of this utility model are:

[0014] This utility model's vascular stent design effectively solves the problems encountered by existing products in clinical applications, thereby improving the efficacy of vascular treatment. By incorporating a folding unit, the diameter of the vascular stent in its compressed state can be reduced, allowing it to adapt to more access vessels of different diameters. This reduces the frequency of using auxiliary tools to dilate the vessel, decreasing the possibility of complications and surgical failure. The vascular stent can be covered with a coating layer entirely or in selected segments, making it suitable for more scenarios such as insufficient proximal anchoring area, important branch vessels in the lesion area, and narrowing of the true lumen due to false lumen compression. By incorporating a positioning part, the vascular stent can better adapt to vascular treatment, reducing the risk of stent displacement and damage to the vessel wall, enhancing stent stability, reducing possible complications during stent implantation, and improving patient safety and comfort. Through structural improvements, the surgical procedure can be simplified, the surgical difficulty reduced, and the success rate of the surgery increased. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an embodiment of a vascular stent of this utility model.

[0017] Figure 2 This is a schematic diagram of a second embodiment of the vascular stent of this utility model.

[0018] Figure 3 This is a schematic diagram of the third embodiment of the vascular stent of this utility model.

[0019] Figure 4 This is a schematic diagram of the fourth embodiment of a vascular stent of this utility model.

[0020] In the figure: 1-support unit, 11-first support rod, 12-second support rod, 13-connecting rod, 2-positioning unit, 3-coating layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Reference Figure 1-4As shown, a vascular stent includes: a support unit 1, wherein multiple support units 1 are arranged in a surrounding manner to form a support group, and each support unit 1 extends axially to form a vascular stent; the support unit includes a first support portion and a second support portion symmetrically arranged, wherein the connection between the first support portion and the second support portion can remain in a contracted state when the vascular stent enters the target position, and can be in an expanded state after receiving an expansion force; both the first support portion and the second support portion are composed of a plurality of first support rods 11, second support rods 12 and connecting rods 13, and a folding unit is formed at the connection between the first support portion and the second support portion, and connecting rods are arranged between the folding units. By adjusting the distribution and number of connecting rods 13 in the vascular stent, the diameter of the vascular stent in the compressed state is changed. The fewer the number of connecting rods 13, the smaller the diameter of the vascular stent when compressed, and vice versa. This also allows the vascular stent to bend towards the side with fewer connecting rods 13, so that the vascular stent can fit more closely to the curved blood vessel, improve the effect of vascular treatment, and avoid phenomena such as endoleak.

[0024] The support unit 1 is provided with a first support part and a second support part arranged symmetrically. Both the first support part and the second support part are composed of a number of first support rods 11, second support rods 12 and connecting rods 13. A folding unit is formed at the connection between the first support part and the second support part. Two second support rods 12 are symmetrically arranged at the folding unit. By bending the second support rods 12 toward the axis of the vascular stent, the second support rods 12 on both sides of the folding unit are brought closer to each other, so that the first support rods 11 and the connecting rods 13 are staggered, thereby reducing the diameter of the vascular stent when compressed. The two ends of the vascular stent are provided with fixing parts. By providing fixing parts, the vascular stent can be more stably fixed to the vascular wall. One end of the vascular stent is also connected to multiple branch stent lines. This stent can be used in the abdominal aorta.

[0025] The support unit 1 is a cylindrical component formed by multiple ring-shaped parts made of medical alloy materials and arranged along its axis. These multiple ring-shaped parts are usually connected together by longitudinal connecting rods 13 made of the same material. The individual ring-shaped parts are formed by bending medical alloy materials to form a structure or woven structure, such as nickel-titanium shape memory alloy, nickel-titanium superelastic alloy, cobalt-chromium-nickel-molybdenum-iron alloy, 316L medical stainless steel alloy, etc.

[0026] The vascular stent has support units 1 at both ends, each with a fixing part, which can be a positioning unit 2 or a covering layer 3. The positioning unit 2 is located on the support unit 1 between adjacent first support rods 11, and the material used for the positioning unit 2 is the same as that used for the support unit 1. The positioning unit 2 is used for positioning and fixing in the blood vessel. The covering layer 3 is a cylindrical component made of medical polymer material, which is sutured to the support unit 1 with medical sutures. Medical polymer materials include polyester fiber textiles, polytetrafluoroethylene, polyamide textiles, polypropylene textiles, fluorinated ethylene propylene, etc. The covering layer 3 can cover the entire vascular stent, or it can be selected for partial segments on the vascular stent. By adjusting the distribution of the covering layer 3 on the vascular stent, the vascular stent can be applied to more vascular treatments.

[0027] Furthermore, referring to Figure 1 As shown, this is a first embodiment of the present invention. In this embodiment, the first support part and the second support part are formed with W-shaped folding units facing the same direction up and down, that is, the upper end is formed with a W-shaped folding unit and the lower end is formed with a W-shaped folding unit. A connecting rod 13 is provided between the folding units at the upper end and the lower end. The two ends of the vascular stent are both provided with positioning units 2.

[0028] Furthermore, referring to Figure 2 As shown, this is a second embodiment of the present invention. In this embodiment, the first support part and the second support part are formed with folding units facing opposite directions, that is, the upper end is formed with a W-shaped folding unit and the lower end is formed with an M-shaped folding unit. There is no connecting rod 13 between the folding units at the upper end and the lower end. The two ends of the vascular stent are both provided with positioning units 2.

[0029] Furthermore, referring to Figure 3 As shown, this is Embodiment 3 of the present invention. In this embodiment, a covering layer 3 is provided at both ends of the vascular stent. The covering layer 3 can better adhere to the vascular wall and can prevent endoleak and damage to the vascular wall. The rest of the vascular stent is hollowed out and will not affect the flow of blood, making it suitable for locations with branched blood vessels. In order to improve the stability of the vascular stent, a positioning unit 2 can also be provided at the covering layer 3 to increase the contact area between the two ends of the vascular stent and the vascular wall.

[0030] Furthermore, referring to Figure 4 As shown, this is Embodiment 4 of the present invention. In this embodiment, all the support units 1 of the vascular stent are connected by the covering layer 30. The vascular stent is used to provide isolation and is suitable for the treatment of aortic dissection and aortic aneurysm. It can prevent the rupture of the vascular wall from causing massive bleeding. In order to improve the stability of the vascular stent, a positioning unit 2 can also be set at the covering layer 3 to increase the contact area between the two ends of the vascular stent and the vascular wall.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vascular stent, characterized in that, include: Support unit (1), a plurality of support units (1) surround and enclose to form a support group, each support unit (1) extending in the axial direction to form a vascular stent; The support unit includes a first support part and a second support part arranged symmetrically. The connection between the first support part and the second support part can be kept in a compressed state when the vascular stent enters the target position and can be in an unfolded state after being released at the target position. The first support part and the second support part are each composed of a plurality of first support rods (11), second support rods (12) and connecting rods (13), and a folding unit is formed at the connection between the first support part and the second support part.

2. A vascular stent according to claim 1, characterized in that, The connection between the first support part and the second support part is provided with a W-shaped folding unit at the upper end and a W-shaped folding unit at the lower end.

3. A vascular stent according to claim 2, characterized in that, The connecting rod (13) is provided between the folding unit at the upper end and the folding unit at the lower end.

4. A vascular stent according to claim 1, characterized in that, The connection between the first support part and the second support part is also provided with a W-shaped folding unit at the upper end and an M-shaped folding unit at the lower end.

5. A vascular stent according to claim 1, characterized in that, The vascular stent also includes a fixing part, which includes a positioning unit (2) disposed on the support unit (1) between two adjacent first support rods (11).

6. A vascular stent according to claim 5, characterized in that, The fixing part also includes a coating layer (3) sewn to the support unit (1).

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