A vein stent that balances radial support and flexibility

Abstract

The application discloses a large vein stent for treating venous diseases, and particularly discloses a venous stent with radial support and flexibility, which comprises a first stent and a second stent, the first stent comprises a first overlapping section and a first support section connected with the first overlapping section, and the second stent comprises a second overlapping section and a second support section connected with the second overlapping section.The venous stent can realize good overlapping and cooperation of the first stent and the second stent, and the overlapping and fixing of the two stents have better stability without increasing the overlapping length.The first stent has better flexibility, and the second stent has better radial support, so that the whole has both flexibility and radial support.

Description

Technical Field

[0001] This invention relates to the field of venous stent technology, and more specifically, to a venous stent that combines radial support and flexibility. Background Technology

[0002] Venous diseases often lead to venous stenosis or occlusion, severely impacting patients' quality of life. The iliac vein, an important vein, serves as a crucial pathway for venous return from the lower limbs to the inferior vena cava. It comprises three parts: the common iliac vein, the external iliac vein, and the internal iliac vein. Stenosis or occlusion of the iliac vein can cause serious complications such as lower limb swelling, pain, ulcers, and even thrombosis.

[0003] Venous stents are an important treatment for venous diseases. Large venous stents, in particular, are very effective in treating lesions in larger veins. Especially for the treatment of iliac vein diseases, sometimes two venous stents are placed in an overlapping configuration. Typically, one stent is anchored distal to the inferior vena cava, covering the compressed segment of the left common iliac vein, while the other is anchored in the external iliac vein. This provides support for the vessel and prevents stenosis. Therefore, when the two stents work together, they need to have good anchoring to prevent detachment or loosening, and the combined stent needs to balance support, flexibility, and flexural strength. Some existing venous stents sometimes fail to meet the required balance between radial support and flexibility. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a venous stent that combines radial support and flexibility.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a venous stent, comprising a first stent and a second stent, wherein the first stent comprises a first overlapping segment and a first support segment connected to the first overlapping segment, and the second stent comprises a second overlapping segment and a second support segment connected to the second overlapping segment.

[0006] Furthermore, the second overlapping segment can overlap with the first overlapping segment.

[0007] Further, the first overlapping section includes multiple first rings and multiple first connecting rods; each first connecting rod has a first groove, and a first magnetic block is fixed in the first groove; the first support section includes multiple spiral rods, multiple limiting rings, and end rings, with the multiple limiting rings evenly spaced and forming a slot between adjacent limiting rings, and a developing rod fixed in one of the limiting rings; the second overlapping section includes multiple second rings and multiple second connecting rods, the second rings including multiple first arc-shaped rods and multiple U-shaped blocks, the multiple first arc-shaped rods and multiple U-shaped blocks being alternately distributed and interconnected, the U-shaped blocks... A second magnetic block is fixed at the location; the second support section includes multiple support rods and multiple support rings; the second overlapping section is also connected to two fixed sections, each fixed section including a strip plate fixedly connected to the second overlapping section and two extension rods fixedly connected to the strip plate, the ends of the extension rods being fixed with insert blocks; an extension unit is connected between each extension rod and one of the extension rods of the other fixed section, the extension unit including two extension rods and two developing blocks fixed between the two extension rods, the extension rods including two second arc-shaped rods fixedly connected to the extension rods and a wave-shaped rod connected between the two second arc-shaped rods.

[0008] Furthermore, the end of the first connecting rod has a first barb.

[0009] Furthermore, the end of the second connecting rod has a second barb.

[0010] Furthermore, the end ring is fixedly connected to multiple spiral rods.

[0011] Furthermore, the second magnetic block can attract the first magnetic block.

[0012] Thus, the first connecting rod can be embedded in the corresponding U-shaped block, and the first bracket and the second bracket can achieve good overlap and positioning in the overlapping area.

[0013] Furthermore, the insert block can be inserted into the slot.

[0014] Furthermore, each first connecting rod has multiple first grooves distributed at equal intervals.

[0015] Furthermore, each first connecting rod has more than two first grooves.

[0016] Furthermore, each first connecting rod has more than four first grooves.

[0017] Furthermore, multiple first rings are parallel to each other, each first ring is connected to all the first connecting rods, and each first connecting rod is connected to all the first rings.

[0018] Furthermore, each limiting ring is fixedly connected to all the screw rods; each screw rod is fixedly connected to all the limiting rings.

[0019] Furthermore, multiple second rings are parallel to each other, each second ring is connected to all the second connecting rods, and each second connecting rod is connected to all the second rings.

[0020] Furthermore, the length of the extension rod is greater than or equal to twice the length of the second overlapping segment.

[0021] This allows the insert and slot to be fixed at a greater distance from the second overlapping section, making the two supports more stable.

[0022] Furthermore, the first and second magnetic blocks are preferably made of materials whose magnetism gradually disappears over time.

[0023] Furthermore, the developing rod is a U-shaped developing rod, and the U-shaped developing rod is fixedly connected to the limiting ring closest to the first overlapping segment.

[0024] Furthermore, the U-shaped developing rod has two.

[0025] Furthermore, the strip plate is fixedly connected to all the second rings.

[0026] Furthermore, the first connecting rod has 6 rods that are evenly spaced in a ring, and the number of U-shaped blocks at each second ring is 6 and they are evenly spaced in a ring.

[0027] Furthermore, there are four second connecting rods and two strip plates, and the four second connecting rods and two strip plates are arranged in a ring with equal spacing.

[0028] Furthermore, the insert is a wedge-shaped block.

[0029] Furthermore, the number of limiting rings is greater than or equal to two, and each limiting ring except the one closest to the first overlapping segment has multiple guide grooves, each guide groove having a guide slope.

[0030] This makes it easier for the insert block to be inserted into the slot when the first and second brackets are installed.

[0031] Furthermore, the limiting ring has four rings.

[0032] Furthermore, the first ring has four rings.

[0033] Furthermore, the second ring has four rings.

[0034] Furthermore, the limiting ring with guide grooves has multiple guide grooves distributed in an annular pattern at equal intervals.

[0035] Furthermore, the limiting ring with guide grooves has 6 guide grooves.

[0036] Furthermore, each first arc-shaped rod is fixedly connected to two adjacent U-shaped blocks.

[0037] Furthermore, a plurality of first end extension rods are connected to the end ring, and the ends of the first end extension rods have third barbs.

[0038] Furthermore, a plurality of second end extension rods are fixed at the support ring furthest from the second overlapping section, and the ends of the second end extension rods have fourth barbs.

[0039] Furthermore, the multiple first end extension rods are distributed in a ring at equal intervals.

[0040] Furthermore, the number of the first end rods is greater than or equal to 6.

[0041] Furthermore, multiple second end extension rods are distributed in a ring at equal intervals.

[0042] Furthermore, the number of the second end rods is greater than or equal to 6.

[0043] Furthermore, the number of the first rings is greater than or equal to two, and they are evenly spaced, with the end of each screw rod connected to the first ring closest to the first support section.

[0044] Furthermore, there are two or more second rings, which are evenly spaced, and the end of each support rod is connected to the second ring closest to the second support segment.

[0045] Furthermore, the distance between the second ring closest to the second support segment and the support ring closest to the second overlapping segment is more than twice the distance between adjacent support rings.

[0046] Beneficial effects:

[0047] 1. The venous stent of this application allows the first and second stents to overlap and cooperate well, and the overlapping fixation of the two stents has better stability without increasing the overlap length.

[0048] 2. The venous stent of this application has a first stent with better flexibility and a second stent with better radial support, so that the whole is both flexible and radially supportive. Attached Figure Description

[0049] Figure 1 A schematic diagram showing the first and second supports separated at a first angle; Figure 2 This is a magnified view of region A; Figure 3 This is a magnified view of region B. Figure 4 This is a magnified view of region C; Figure 5 A schematic diagram showing the second angle separating the first and second supports; Figure 6 This is a magnified view of region D; Figure 7 This is a magnified view of region E. Figure 8 This is a schematic diagram of the first angle after the first and second supports overlap. Figure 9 This is a magnified view of region F; Figure 10 This is a magnified view of region G; Figure 11 This is a magnified view of region H; Figure 12 This is a schematic diagram of the second angle after the first and second supports overlap. Figure 13 This is a magnified view of region I; Figure 14 This is a magnified view of region J. Figure 15 This is a magnified view of region K.

[0050] Explanation of reference numerals in the attached drawings: First support 1; First ring 1.1; First connecting rod 1.2; First barb 1.3; First magnet 1.4; Spiral rod 1.5; Limiting ring 1.6; Guide groove 1.6.1; End ring 1.7; Developing rod 1.8; Second support 2; Second ring 2.1; First arc-shaped rod 2.1.1; U-shaped block 2.1.2; Second connecting rod 2.2; Second barb 2.3; Second magnet 2.4; Support rod 2.5; Support ring 2.6; Strip plate 3.1; Extension rod 3.2; Insert block 3.3; Second arc-shaped rod 4.1; Wavy rod 4.2; Developing block 4.3; First end extension rod 5; Third barb 5.1; Second end extension rod 6; Fourth barb 6.1. Detailed Implementation

[0051] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0052] The present invention provides a venous stent that combines radial support and flexibility, as shown in the figure, including a first stent 1 and a second stent 2. The first stent 1 includes a first overlapping segment and a first support segment connected to the first overlapping segment. The second stent 2 includes a second overlapping segment that can overlap with the first overlapping segment and a second support segment connected to the second overlapping segment. The first overlapping section includes multiple first rings 1.1 and multiple first connecting rods 1.2, with the ends of the first connecting rods 1.2 having first barbs 1.3; each first connecting rod 1.2 has a first groove, and a first magnetic block 1.4 is fixed in the first groove; the first support section includes multiple spiral rods 1.5, multiple limiting rings 1.6, and end rings 1.7 connected to the multiple spiral rods 1.5, with the multiple limiting rings 1.6 evenly distributed, forming a slot between adjacent limiting rings 1.6, and a developing rod 1.8 fixed in one of the limiting rings 1.6; the second overlapping section includes multiple second rings 2.1 and multiple second connecting rods 2.2, with the ends of the second connecting rods 2.2 having second barbs 2.3, and the second rings 2.1 including multiple first arc-shaped rods 2.1.1 and multiple U-shaped blocks 2.1.2, the multiple first arc-shaped rods 2.1.1 and multiple U-shaped blocks 2.1.2, the multiple first arc-shaped rods 2.1.1 and multiple U-shaped blocks 2.1.2, the multiple U ... The U-shaped blocks 2.1.2 are alternately distributed and interconnected. A second magnetic block 2.4 that can attract the first magnetic block 1.4 is fixed at the U-shaped block 2.1.2. The second support section includes multiple support rods 2.5 and multiple support rings 2.6. The second overlapping section is also connected to two fixed sections. The fixed section includes a strip plate 3.1 fixedly connected to the second overlapping section and two extension rods 3.2 fixedly connected to the strip plate 3.1. The end of the extension rod 3.2 is fixed with a plug block 3.3 that can be inserted into the slot. An extension unit is connected between each extension rod and one of the extension rods of the other fixed section. The extension unit includes two extension rods and two developing blocks 4.3 fixed between the two extension rods. The extension rods include two second arc-shaped rods 4.1 fixedly connected to the extension rods 3.2 and a wave-shaped rod 4.2 connected between the two second arc-shaped rods 4.1.

[0053] The developing rod 1.8 is a U-shaped developing rod, and the U-shaped developing rod is fixedly connected to the limiting ring 1.6 closest to the first overlapping section. There are two U-shaped developing rods. The strip plate 3.1 is fixedly connected to all the second rings 2.1. There are 6 first connecting rods 1.2, which are distributed in a ring at equal intervals. There are 6 U-shaped blocks 2.1.2 at each second ring 2.1, which are also distributed in a ring at equal intervals. The insert block 3.3 is a wedge block. There are two or more limiting rings 1.6. Except for the limiting ring closest to the first overlapping section, each limiting ring has multiple guide grooves 1.6.1. The guide grooves 1.6.1 have guide slopes. The limiting ring 1.6 with guide grooves 1.6.1 has multiple guide grooves 1.6.1 distributed in a ring at equal intervals. Multiple first end extension rods 5 are connected to the end ring 1.7, and the ends of the first end extension rods 5 have third barbs 5.1. Multiple second end extension rods 6 are fixed at the support ring 2.6 furthest from the second overlapping section, and the ends of the second end extension rods 6 have fourth barbs 6.1. There are at least two first rings 1.1, which are evenly spaced, and the end of each spiral rod 1.5 is connected to the first ring 1.1 closest to the first support section. There are at least two second rings 2.1, which are evenly spaced, and the end of each support rod 2.5 is connected to the second ring 2.1 closest to the second support section. The distance between the second ring 2.1 closest to the second support section and the support ring 2.6 closest to the second overlapping section is more than twice the distance between adjacent support rings 2.6.

[0054] Working Principle: The venous stent of this application includes a first stent and a second stent. During deployment, the first stent is first deployed to the external iliac vein, followed by the second stent, ensuring an overlapping area between the two stents. Specifically, during deployment of the first stent, the first and third barbs at the first stent can achieve good anchoring with the inner wall of the blood vessel. Then, during deployment of the second stent, positioning is achieved through the U-shaped contrast agent and contrast block, thus ensuring good positioning between the second and first stents. After the second stent is delivered to the designated position and its angle relative to the first stent is adjusted, during the self-expansion of the second stent, the first connecting rod can embed into the corresponding U-shaped block due to the mutual attraction between the first and second magnetic blocks. This ensures good overlap and positioning of the first and second stents in the overlapping area. Furthermore, the position of the insertion block corresponds precisely to the positions of multiple limiting rings. Since multiple insertion slots are formed between the limiting rings, the insertion block only needs to be inserted into one of these slots. Furthermore, the inner side of the limiting ring has a guiding groove with a guiding slope. When the insert abuts against the guiding groove (in which the relative position of the insert and the limiting ring is unstable), the guiding slope facilitates the insertion of the insert into the corresponding insertion slot, thus stabilizing the position of the insert and the limiting ring. During this process, the extension rod, with its wavy shape providing elasticity, can expand, and the gap between the two extension rods fixed at the same strip plate provides sufficient space for them to expand outwards. This allows multiple extension rods to expand outwards, forming a stable connection with the insertion slot. After the second stent expands, the second and fourth barbs can also achieve good anchoring with the blood vessel, resulting in a good overlap between the first and second stents and proper installation with the blood vessel. Not only do the first and second stents overlap, but the second stent is also fixed by the insertion slot of the insert block, further stabilizing the overlap between the first and second stents without increasing the length of the overlap area.

[0055] Furthermore, the first stent has multiple helical rods with a low density, resulting in excellent overall flexibility and helping to prevent blood turbulence. Multiple limiting rings increase radial support, and because these rings are very short along the stent's length, they do not affect the first stent's flexibility in that direction. Additionally, the second stent has higher density support rings and support rods, resulting in better radial support characteristics and greater strength.

[0056] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A venous stent that combines radial support and flexibility, characterized in that, The system includes a first support and a second support. The first support includes a first overlapping section and a first support section connected to the first overlapping section. The second support includes a second overlapping section and a second support section connected to the second overlapping section. The first overlapping section includes multiple first rings and multiple first connecting rods, with the ends of the first connecting rods having first barbs. Each first connecting rod has a first groove, and a first magnet is fixed to the first groove. The first support section includes multiple spiral rods, multiple limiting rings, and end rings. The multiple limiting rings are evenly spaced, and a slot is formed between adjacent limiting rings. A developing rod is fixed to one of the limiting rings. The second overlapping section includes multiple second rings and multiple second connecting rods, with the ends of the second connecting rods having second barbs. The second ring includes multiple first arc-shaped rods and multiple U-shaped blocks, which are alternately distributed and interconnected. A second magnetic block is fixed at each U-shaped block. The second support section includes multiple support rods and multiple support rings. The second overlapping section is also connected to two fixed sections. The fixed section includes a strip plate fixedly connected to the second overlapping section and two extension rods fixedly connected to the strip plate. An insert block is fixed to the end of each extension rod. An extension unit is connected between each extension rod and one of the extension rods of the other fixed section. The extension unit includes two extension rods and two developing blocks fixed between the two extension rods. The extension rods include two second arc-shaped rods fixedly connected to the extension rods and a wavy rod connected between the two second arc-shaped rods.

2. The venous stent that combines radial support and flexibility according to claim 1, characterized in that, The developing rod is a U-shaped developing rod, and the U-shaped developing rod is fixedly connected to the limiting ring closest to the first overlapping section. There are two U-shaped developing rods.

3. The venous stent that combines radial support and flexibility according to claim 1, characterized in that, The strip plate is fixedly connected to all the second rings; the first connecting rod has 6 rods that are evenly spaced in a ring, and the number of U-shaped blocks at each second ring is 6 and they are evenly spaced in a ring.

4. The venous stent that combines radial support and flexibility according to claim 1, characterized in that, The insert is a wedge-shaped block; the number of limiting rings is greater than or equal to two, and each limiting ring except the one closest to the first overlapping segment has multiple guide grooves, each guide groove having a guide slope; the limiting ring with guide grooves has multiple guide grooves distributed in a ring at equal intervals.

5. The venous stent that combines radial support and flexibility according to claim 1, characterized in that, The end ring is connected to a plurality of first end extension rods, the ends of which have third barbs; the support ring furthest from the second overlapping section is fixed with a plurality of second end extension rods, the ends of which have fourth barbs.

6. The venous stent that combines radial support and flexibility according to claim 1, characterized in that, The number of the first rings is greater than or equal to two, and they are evenly spaced. The end of each spiral rod is connected to the first ring closest to the first support section. The number of the second rings is greater than or equal to two, and they are evenly spaced. The end of each support rod is connected to the second ring closest to the second support section.

7. The venous stent that combines radial support and flexibility according to claim 1, characterized in that, The distance between the second ring closest to the second support segment and the support ring closest to the second overlapping segment is more than twice the distance between adjacent support rings.

Images