Venous stent giving consideration to radial support and flexibility

Abstract

The invention discloses a large vein stent for treating vein diseases, and particularly discloses a vein stent giving consideration to radial supporting and flexibility, the vein stent comprises a first stent and a second stent, the first stent comprises a first overlapping section and a first supporting section connected with the first overlapping section, and the second stent comprises a second overlapping section and a second supporting section connected with the second overlapping section; the second support comprises a second overlapping section and a second supporting section connected with the second overlapping section. According to the venous stent, the first stent body and the second stent body can be well overlapped and matched, and under the condition that the overlapping length is not increased, the first stent body and the second stent body are overlapped and fixed, so that better stability is achieved. The first stent has better flexibility, and the second stent has better radial supporting performance, so that the formed whole has both flexibility and radial supporting performance.

Description

Technical Field

[0001] The present invention relates to the technical field of venous stents, and more particularly to a venous stent that combines radial support and flexibility. Background Art

[0002] Venous disease often leads to venous stenosis or occlusion, severely impacting patients' quality of life. The iliac vein is a vital channel for venous return from the lower extremities to the inferior vena cava. It is divided into 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 extremity swelling, pain, ulcers, and even thrombosis.

[0003] Venous stents are an important treatment for venous diseases. In particular, large venous stents are very effective in treating lesions in larger veins. Especially for the treatment of iliac vein diseases, two overlapping venous stents are sometimes used. Usually, one stent is anchored at the distal end of the inferior vena cava, covering the compressed section of the left common iliac vein, and the other stent is anchored in the external iliac vein. This supports the blood vessels and avoids vascular stenosis. Therefore, when the two stents work together, they need to have good anchoring to avoid the two stents from detaching or loosening from each other, and the combined stent needs to take into account support force, flexibility and anti-bending properties. Some existing venous stents sometimes do not meet the required requirements between radial support and flexibility. Summary of the Invention

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

[0005] In order to achieve the above-mentioned 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 supporting segment connected to the first overlapping segment, and the second stent comprises a second overlapping segment and a second supporting segment connected to the second overlapping segment.

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

[0007] Furthermore, the first overlapping section includes a plurality of first circular rings and a plurality of first connecting rods; each first connecting rod has a first groove, and a first magnetic block is fixed to the first groove; the first supporting section includes a plurality of spiral spiral rods, a plurality of limiting rings and an end circular ring, the plurality of limiting rings are distributed at equal intervals, and a gap is formed between two adjacent limiting rings, and a developing rod is fixed to one of the limiting rings; the second overlapping section includes a plurality of second circular rings and a plurality of second connecting rods, the second circular rings include a plurality of first arc-shaped rods and a plurality of U-shaped blocks, the plurality of first arc-shaped rods and the plurality of U-shaped blocks are alternately distributed and connected to each other, and the U-shaped blocks A second magnetic block is fixed at the position; the second supporting 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, and the ends of the extension rods are fixed with plug-in blocks; 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 rod includes two second arc rods fixedly connected to the extension rods and a wavy rod connected between the two second arc 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 rings are fixedly connected to the multiple spiral rods.

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

[0012] Therefore, 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 insert slit.

[0014] Furthermore, each first connecting rod has a plurality of 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, the multiple first circular rings are parallel to each other, each first circular ring is connected to all the first connecting rods, and each first connecting rod is connected to all the first circular rings.

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

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

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

[0021] Therefore, the inserting block and the inserting slot can be fixed at a greater distance from the second overlapping section, thereby making the fixation of the two brackets more stable.

[0022] Furthermore, the first magnetic block and the second magnetic block are preferably made of a material whose magnetism can gradually disappear 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 section.

[0024] Furthermore, there are two U-shaped developing rods.

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

[0026] Furthermore, there are six first connecting rods distributed in a circular shape with equal intervals, and there are six U-shaped blocks at each second circular ring with equal intervals.

[0027] Furthermore, there are four second connecting rods and two strip plates, and the four second connecting rods and the two strip plates are distributed in a circular shape with equal intervals.

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

[0029] Furthermore, the number of the limiting rings is greater than or equal to two, and the limiting rings except the limiting ring closest to the first overlapping section are provided with a plurality of guide grooves, and the guide grooves have guiding inclined surfaces.

[0030] Therefore, when the first bracket and the second bracket are installed, the inserting block can be inserted into the inserting gap more easily.

[0031] Furthermore, there are four limiting rings.

[0032] Furthermore, there are four first rings.

[0033] Furthermore, there are four second rings.

[0034] Furthermore, the limiting ring with the guide groove has a plurality of guide grooves distributed in an annular shape with equal intervals.

[0035] Furthermore, the limiting ring with the guide groove 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 to the support ring farthest from the second overlapping section, and the ends of the second end extension rods have fourth barbs.

[0039] Furthermore, the plurality of first end extension rods are distributed in a circular shape with equal intervals.

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

[0041] Furthermore, the plurality of second end extension rods are distributed in a circular shape with 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 circular rings is greater than or equal to 2 and is distributed at equal intervals, and the end of each spiral rod is connected to the first circular ring closest to the first supporting section.

[0044] Furthermore, the number of the second circular rings is greater than or equal to 2 and is distributed at equal intervals, and the end of each support rod is connected to the second circular ring closest to the second support section.

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

[0046] Beneficial effects:

[0047] 1. In the venous stent of the present application, the first stent and the second stent can achieve good overlap and fit, and without increasing the overlapping length, the overlapping fixation of the two stents has better stability.

[0048] 2. In the venous stent of the present application, the first stent has better flexibility, and the second stent has better radial support, so that the overall structure has both flexibility and radial support. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0050] Explanation of the reference numerals: first bracket 1; first circular ring 1.1; first connecting rod 1.2; first barb 1.3; first magnetic block 1.4; spiral rod 1.5; limiting ring 1.6; guide groove 1.6.1; end circular ring 1.7; developing rod 1.8; second bracket 2; second circular ring 2.1; first curved rod 2.1.1; U-shaped block 2.1.2; second connecting rod 2.2; second barb 2.3; second magnetic block 2.4; supporting rod 2.5; supporting ring 2.6; strip plate 3.1; extension rod 3.2; insert block 3.3; second curved 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 DESCRIPTION

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

[0052] The present invention provides a venous stent that takes into account both radial support and flexibility as shown in the figure, including a first stent 1 and a second stent 2, wherein the first stent 1 includes a first overlapping segment and a first supporting segment connected to the first overlapping segment, and the second stent 2 includes a second overlapping segment that can overlap with the first overlapping segment and a second supporting segment connected to the second overlapping segment. The first overlapping section includes a plurality of first circular rings 1.1 and a plurality of first connecting rods 1.2, and the end of the first connecting rod 1.2 has a first barb 1.3; each first connecting rod 1.2 has a first groove, and a first magnetic block 1.4 is fixed to the first groove; the first supporting section includes a plurality of spiral spiral rods 1.5, a plurality of limiting rings 1.6 and an end circular ring 1.7 connected to the plurality of spiral rods 1.5, the plurality of limiting rings 1.6 are distributed at equal intervals, and a gap is formed between two adjacent limiting rings 1.6, and a developing rod 1.8 is fixed to one of the limiting rings 1.6; the second overlapping section includes a plurality of second circular rings 2.1 and a plurality of second connecting rods 2.2, the end of the second connecting rod 2.2 has a second barb 2.3, the second circular ring 2.1 includes a plurality of first arc rods 2.1.1 and a plurality of U-shaped blocks 2.1.2, the plurality of first arc rods 2.1.1 and a plurality of U The U-shaped blocks 2.1.2 are alternately distributed and interconnected, and 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, and 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, and the ends of the extension rods 3.2 are fixed with plug-in blocks 3.3 that can be inserted into the insertion gap; an extension unit is connected between each extension rod and one of the extension rods of the other fixed section, and the extension unit includes two extension rods and two developing blocks 4.3 fixed between the two extension rods, and the extension rod includes two second arc rods 4.1 fixedly connected to the extension rod 3.2 and a wavy rod 4.2 connected between the two second arc rods 4.1.

[0053] The developing rod 1.8 is a U-shaped developing rod, and 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 second circular rings 2.1. There are six first connecting rods 1.2, which are evenly spaced in a circular pattern. The number of U-shaped blocks 2.1.2 on each second circular ring 2.1 is six, and they are evenly spaced in a circular pattern. The insert block 3.3 is a wedge-shaped block. There are two or more limiting rings 1.6. All limiting rings except the one closest to the first overlapping section have multiple guide grooves 1.6.1, each of which has a guiding slope. The limiting ring 1.6 having a guide groove 1.6.1 also has multiple guide grooves 1.6.1 distributed in a circular pattern with equal spacing. The end ring 1.7 is connected to a plurality of first end extension rods 5, each having a third barb 5.1 at its end. The support ring 2.6 farthest from the second overlapping section is fixed to a plurality of second end extension rods 6, each having a fourth barb 6.1 at its end. The number of the first rings 1.1 is greater than or equal to two, and they are evenly spaced, with the end of each spiral rod 1.5 connected to the first ring 1.1 closest to the first support section. The number of the second rings 2.1 is greater than or equal to two, and they are evenly spaced, with the end of each support rod 2.5 connected to the second ring 2.1 closest to the second support section. The spacing 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 spacing between adjacent support rings 2.6.

[0054] Working Principle: The venous stent of the present application comprises a first stent and a second stent. During release, the first stent is first released into the external iliac vein, followed by the second stent, with the second stent and the first stent overlapping. Specifically, when the first stent is released, the first and third barbs on the first stent are effectively anchored to the inner wall of the blood vessel. Subsequently, when the second stent is released, the U-shaped developing rod and developing block facilitate positioning during operation, ensuring optimal alignment of the second stent with the first stent. After the second stent is positioned and its angle relative to the first is adjusted, the second stent expands during its self-expansion. Due to the mutual attraction between the first and second magnetic blocks, the first connecting rod engages the corresponding U-shaped block, ensuring optimal overlap and positioning of the first and second stents in the overlapping region. Furthermore, the position of the insert block aligns with the positions of multiple retaining rings. Since multiple insertion slots are formed between the retaining rings, the insert block only needs to be inserted into one of the slots. The retaining ring also has a guide groove on its inner side, which has a guiding slope. This helps the insert be guided by the guide slope when it abuts the groove (in this state, the relative position of the insert and retaining ring is unstable), allowing it to fit into the corresponding insertion slot, thus maintaining a stable position between the insert and retaining ring. During this process, the wavy shape of the extension rod provides a certain degree of elasticity, allowing it to expand. A gap exists between the two extension rods fixed to the same strip plate (allowing them to expand outward under the action of the extension rod), allowing multiple extension rods to expand outward, forming a stable fixed connection with the insertion slot. After the second stent self-expands, the second and fourth barbs can also effectively anchor the stent to the blood vessel, thereby achieving a good overlap and securement between the first and second stents. Not only does the first and second stents have an overlapping area, but the second stent is also secured to the insertion slot of the first stent by the insert, further stabilizing the overlap and improving the stability of the overlap without increasing the length of the overlapping area.

[0055] The first stent has multiple low-density spiral rods, resulting in excellent overall flexibility and helping to prevent blood turbulence. Multiple retaining rings enhance radial support, and because these rings are short along the length of the stent, they do not affect the longitudinal flexibility of the first stent. Furthermore, the second stent's support rings and rods have a higher density, resulting in better radial support and greater strength.

[0056] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A venous stent that combines radial support and flexibility, characterized in that: The invention comprises a first bracket and a second bracket, wherein the first bracket comprises a first overlapping section and a first supporting section connected to the first overlapping section, and the second bracket comprises a second overlapping section and a second supporting section connected to the second overlapping section.

2. The venous stent with both radial support and flexibility according to claim 1, characterized in that: The first overlapping section includes a plurality of first circular rings and a plurality of first connecting rods, and the end of the first connecting rod has a first barb; each first connecting rod has a first groove, and a first magnetic block is fixed to the first groove; the first supporting section includes a plurality of spiral spiral rods, a plurality of limiting rings and an end circular ring, and the plurality of limiting rings are distributed at equal intervals, and a gap is formed between two adjacent limiting rings, and a developing rod is fixed to one of the limiting rings; the second overlapping section includes a plurality of second circular rings and a plurality of second connecting rods, and the end of the second connecting rod has a second barb, and the second circular ring includes a plurality of first arc-shaped rods and a plurality of U-shaped blocks, and the plurality of first arc-shaped rods and the plurality of U-shaped blocks are alternately Distributed and interconnected, a second magnetic block is fixed at the U-shaped block; the second supporting section includes a plurality of supporting rods and a plurality of supporting 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, and the ends of the extension rods are fixed with plug-in blocks; 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 rod includes two second arc rods fixedly connected to the extension rod and a wavy rod connected between the two second arc rods.

3. The venous stent with both radial support and flexibility according to claim 2, 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, and there are two U-shaped developing rods.

4. The venous stent with both radial support and flexibility according to claim 2, characterized in that: The strip plates are fixedly connected to all the second circular rings; there are 6 first connecting rods which are distributed in a circular pattern with equal spacing; and there are 6 U-shaped blocks at each second circular ring which are distributed in a circular pattern with equal spacing.

5. The venous stent with both radial support and flexibility according to claim 2, characterized in that: The insert block is a wedge-shaped block; the number of the limiting rings is greater than or equal to two, and all limiting rings except the limiting ring closest to the first overlapping section have multiple guide grooves, and the guide grooves have guiding inclined surfaces; the limiting rings with guide grooves have multiple guide grooves distributed in a circular shape with equal intervals.

6. The venous stent with both radial support and flexibility according to claim 2, characterized in that: The end ring is connected to a plurality of first end extension rods, each end of which has a third barb; the support ring farthest from the second overlapping section is fixed with a plurality of second end extension rods, each end of which has a fourth barb.

7. The venous stent with both radial support and flexibility according to claim 2, characterized in that: The number of the first circular rings is greater than or equal to 2, and they are distributed at equal intervals, and the end of each spiral rod is connected to the first circular ring closest to the first support segment; the number of the second circular rings is greater than or equal to 2, and they are distributed at equal intervals, and the end of each support rod is connected to the second circular ring closest to the second support segment.

8. The venous stent with both radial support and flexibility according to claim 2, characterized in that: The distance between the second circular ring closest to the second supporting segment and the supporting ring closest to the second overlapping segment is more than twice the distance between adjacent supporting rings.

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