A vein stent

Abstract

The application discloses a vein stent, comprising a first stent unit and a second stent unit, the first stent unit comprising a first stent body, a plurality of first end units and a plurality of second end units, the first stent body comprising a plurality of spiral rods; the second stent unit comprising a second stent body, a plurality of third end units and a plurality of fourth end units. The vein stent of the application is combined with two stent units, so that the vein stent is more selective in use. The cooperation of the two stent units makes one end have better radial support characteristics and the other end have better flexibility, and the spiral spiral rods can make blood rotate, which is more conducive to the flow of blood in the blood vessel after the stent is installed. The spiral stent can effectively convert the turbulent blood flow into more orderly and laminar rotary blood flow by guiding the blood flow to advance along the spiral path, thereby reducing the generation of turbulent flow and reducing the probability of thrombus formation.

Description

Technical Field

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

[0002] A venous stent is a medical device used to treat venous stenosis or blockage. Its primary function is to restore venous blood flow, improve symptoms such as lower limb swelling and pain caused by venous stenosis, and reduce the risk of serious complications such as pulmonary embolism due to thrombus dislodgement. Venous stents are suitable for conditions such as iliac vein compression syndrome, deep vein thrombosis and post-thrombotic syndrome.

[0003] Treatment of venous diseases is inherently complex, as are the degrees of lesions within the blood vessels. This is especially true for diseases in specific locations like the iliac vein, where treatment presents numerous challenges. During interventional procedures, temporary adjustments are often necessary based on the specific condition of the lesion. For example, the length of the lesion must be considered to determine whether an additional stent is needed to better cover the affected area. While using multiple stents in combination can effectively cover longer areas, proper coordination is required to ensure that multiple stents work together to provide ideal support and flexibility in different locations. Furthermore, after successful stent placement, it is crucial to ensure that the stent's position does not shift, necessitating good anchorage. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention provides the following technical solution: a venous stent, comprising a first stent unit and a second stent unit. The first stent unit includes a first stent body, a plurality of first end units connected to the proximal end of the first stent body, and a plurality of second end units connected to the distal end of the first stent body. The first stent body includes a plurality of helical rods, with adjacent helical rods connected to a first end unit and a second end unit. The first end unit includes two first connecting rods fixedly connected to the ends of the helical rods and a rounded V-shaped rod connecting the two first connecting rods. The second end unit includes two second connecting rods fixedly connected to the ends of the helical rods and a rounded V-shaped rod connecting the two second connecting rods. The second stent unit includes a second stent body, a plurality of third end units fixedly connected to the proximal end of the second stent body, and a plurality of fourth end units fixedly connected to the distal end of the second stent body. The third end unit includes a first elastic rod, a third connecting rod fixedly connected to the first elastic rod, and a first annular portion fixedly connected to the third connecting rod. The fourth end unit includes an extension rod, a second elastic rod fixedly connected to the extension rod, a fourth connecting rod fixedly connected to the second elastic rod, and a second annular portion fixedly connected to the fourth connecting rod.

[0006] Furthermore, the venous stent is an iliac vein stent.

[0007] Furthermore, both the first annular portion and the second annular portion are elliptical rings.

[0008] Furthermore, a first barb is fixed to the inverted V-shaped rod, and a second barb is fixed to the V-shaped rod; a first arc-shaped abutment rod is fixedly connected to the first annular portion, and a second arc-shaped abutment rod is fixed to the second annular portion; the number of V-shaped rods and the number of first annular portions are equal and they correspond one-to-one; the first annular portion is embedded in the corresponding V-shaped rod; two limiting portions are fixed to the V-shaped rod; the limiting portion includes a connecting block fixedly connected to the V-shaped rod, an extension plate fixedly connected to the connecting block, and a limiting block fixedly connected to the extension plate; the limiting block is inserted into the first annular portion.

[0009] Furthermore, each third connecting rod abuts against the corresponding V-shaped rod, and the thickness of the first annular portion is greater than or equal to 1.5 times the thickness of the third connecting rod.

[0010] Furthermore, each third connecting rod abuts against the inside of the corresponding V-shaped rod.

[0011] Thus, the dimensions of the third connecting rod and the first annular portion are matched. Under the action of the first elastic rod, the third connecting rod compresses the V-shaped rod, allowing the barbs at the V-shaped rod to better fit against the inner wall of the blood vessel. Furthermore, under the action of the first elastic rod, the first annular portion can also better facilitate the first arc-shaped abutment rod to abut against the blood vessel. Similarly, under the action of the second elastic rod, the second annular portion can better facilitate the second arc-shaped abutment rod to abut against the blood vessel.

[0012] Furthermore, both the first elastic rod and the second elastic rod are arc-shaped.

[0013] Therefore, the first and second elastic rods, due to their arc-shaped forms, possess a certain degree of elasticity, resulting in an outward expansion effect.

[0014] Furthermore, both the first annular portion and the second annular portion are elliptical rings.

[0015] Furthermore, the number of the spiral rods is greater than or equal to 6; the multiple spiral rods are distributed in a ring with equal spacing; the pitch of the spiral rods is equal from the proximal end to the distal end.

[0016] In other embodiments, the pitch of the screw gradually increases from the proximal end to the distal end.

[0017] Thus, the proximal end of the first support unit has better radial support, while the distal end has better flexibility.

[0018] Furthermore, the first support unit includes a plurality of first developing rings and a plurality of second developing rings, each first developing ring being fixedly connected to two adjacent first connecting rods, and each second developing ring being fixedly connected to two adjacent second connecting rods.

[0019] This allows for better imaging and positioning of the first support unit during the insertion process.

[0020] Furthermore, a third developing ring is fixed at each first annular portion and located within the first annular portion, and a fourth developing ring is fixed at each second annular portion and located within the second annular portion.

[0021] This allows for better imaging and positioning of the second support unit during the insertion process.

[0022] Furthermore, the inverted V-shaped rod includes two first transition rods, two first main rods, and a first arc-shaped rod. The first arc-shaped rod connects the two first main rods, and the first transition rod connects the first connecting rod and the first main rod. The V-shaped rod includes two second transition rods, two second main rods, and a second arc-shaped rod. The second arc-shaped rod connects the two second main rods, and the second transition rod connects the second connecting rod and the second main rod. Both the first transition rod and the second transition rod are arc-shaped.

[0023] Furthermore, the second support body includes a plurality of first straight rods distributed in a ring at equal intervals, a plurality of second straight rods distributed in a ring at equal intervals, a plurality of inverted V-shaped first connecting frames, and a plurality of V-shaped second connecting frames, wherein the number of first straight rods, second straight rods, first connecting frames, and second connecting frames are equal.

[0024] Furthermore, the number of the first straight rod, the third end unit, and the fourth end unit are equal. The proximal end of each first straight rod is connected to the first elastic rod, and the distal end is connected to the first connecting frame. The proximal end of each second straight rod is connected to the first connecting frame, and the distal end is connected to the second connecting frame. Each second connecting frame is connected to the extension rod.

[0025] Furthermore, each first connecting frame is connected to a first straight rod and two second straight rods, and each second connecting frame is connected to an extension rod and two second straight rods.

[0026] Furthermore, multiple fifth connecting rods connect two adjacent first straight rods, and multiple sixth connecting rods connect two adjacent second straight rods.

[0027] Furthermore, the number of the first straight rod, the second straight rod, the first connecting frame, and the second connecting frame are all 6-8.

[0028] Furthermore, the length of the second straight rod is greater than or equal to the length of the first straight rod, and the number of fifth connecting rods between two adjacent first straight rods is greater than or equal to the number of sixth connecting rods between two adjacent second straight rods.

[0029] Furthermore, the fifth connecting rod is shaped like a part of a spiral.

[0030] Furthermore, the sixth connecting rod is shaped like a helix.

[0031] Furthermore, the number of fifth connecting rods between two adjacent first straight rods is 4-6.

[0032] Furthermore, the number of sixth connecting rods for two adjacent second straight rods is 3-5.

[0033] Beneficial effects:

[0034] 1. The venous stent of this application combines two stent units, which makes the venous stent more versatile in use. In fact, during clinical treatment, it is possible to choose whether or not to install a second stent unit as needed.

[0035] 2. The venous stent of this application, with the cooperation of two stent units, gives one end better radial support characteristics and the other end better flexibility. Furthermore, the spiral rod can cause blood to rotate, which is more conducive to the flow of blood in the blood vessel after the stent is installed. By guiding the blood flow along the spiral path, the spiral stent can effectively transform the turbulent blood flow into a more orderly, laminar rotating blood flow, thereby reducing the generation of turbulence and lowering the probability of thrombosis.

[0036] 3. The venous stent of this application, when used in combination with two stent units, can limit and lock each other, so that the two stent units can be used as a whole, with better stability. Attached Figure Description

[0037] Figure 1 This is a first-person view diagram of a venous stent.

[0038] Figure 2 This is a magnified view of region A;

[0039] Figure 3 This is a magnified view of region B.

[0040] Figure 4 This is a magnified view of region C;

[0041] Figure 5 This is a schematic diagram of a venous stent from a second perspective.

[0042] Figure 6 This is a magnified view of region D;

[0043] Figure 7 This is a magnified view of region E.

[0044] Figure 8 This is a magnified view of region F;

[0045] Figure 9 This is a magnified view of region G;

[0046] Figure 10 A schematic diagram showing the separation of the first support unit and the second support unit;

[0047] Figure 11 This is a magnified view of region H;

[0048] Figure 12 This is a magnified view of region I;

[0049] Figure 13 This is a magnified view of region J.

[0050] Figure 14 This is a magnified view of region K.

[0051] Explanation of reference numerals in the attached drawings: 1. Spiral rod; 2.1. First connecting rod; 2.2. First transition rod; 2.3. First main body rod; 2.4. First arc-shaped rod; 2.5. First barb; 3.1. Second connecting rod; 3.2. Second transition rod; 3.3. Second main body rod; 3.4. Second arc-shaped rod; 3.5. Second barb; 4.1. First straight rod; 4.2. Second straight rod; 4.3. First connecting frame; 4.4. Second connecting frame; 4.5. Fifth connecting rod; 4.6. Sixth connecting rod; 5.1. First elastic rod; 5.2. Third connecting rod; 5.3. First annular portion; 5.4. First arc-shaped abutment rod; 5.5. Third developing ring; 6.1. Extension rod; 6.2. Second elastic rod; 6.3. Fourth connecting rod; 6.4. Second annular portion; 6.5. Second arc-shaped abutment rod; 6.6. Fourth developing ring; 7.1. Connecting block; 7.2. Extension plate; 7.3. Limiting block; 8. First developing ring; 9. Second developing ring. Detailed Implementation

[0052] 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.

[0053] This invention provides a venous stent as shown in the figure, comprising a first stent unit and a second stent unit. The first stent unit includes a first stent body, a plurality of first end units connected to the proximal end of the first stent body, and a plurality of second end units connected to the distal end of the first stent body. The first stent body includes a plurality of helical rods 1, with adjacent helical rods 1 connected to a first end unit and a second end unit. The first end unit includes two first connecting rods 2.1 fixedly connected to the ends of the helical rods 1 and a rounded V-shaped rod connecting the two first connecting rods 2.1. The second end unit includes two second connecting rods 3.1 fixedly connected to the ends of the helical rods 1 and a connecting rod connecting... Two second connecting rods 3.1 with rounded V-shaped rods; the second support unit includes a second support body, multiple third end units fixedly connected to the proximal end of the second support body, and multiple fourth end units fixedly connected to the distal end of the second support body. The third end unit includes a first elastic rod 5.1, a third connecting rod 5.2 fixedly connected to the first elastic rod 5.1, and a first annular portion 5.3 fixedly connected to the third connecting rod 5.2. The fourth end unit includes an extension rod 6.1, a second elastic rod 6.2 fixedly connected to the extension rod 6.1, a fourth connecting rod 6.3 fixedly connected to the second elastic rod 6.2, and a second annular portion 6.4 fixedly connected to the fourth connecting rod 6.3. A first barb 2.5 is fixed to the inverted V-shaped rod, and a second barb 3.5 is fixed to the V-shaped rod; a first arc-shaped abutment rod 5.4 is fixedly connected to the first annular portion 5.3, and a second arc-shaped abutment rod 6.5 is fixed to the second annular portion 6.4; the number of V-shaped rods and the number of first annular portions 5.3 are equal and they correspond one-to-one, the first annular portion 5.3 is embedded in the corresponding V-shaped rod, and two limiting portions are fixed to the V-shaped rod, the limiting portion including a connecting block 7.1 fixedly connected to the V-shaped rod, an extension plate 7.2 fixedly connected to the connecting block 7.1, and a limiting block 7.3 fixedly connected to the extension plate 7.2, the limiting block 7.3 being inserted into the first annular portion 5.3.

[0054] Each third connecting rod 5.2 abuts against its corresponding V-shaped rod, and the thickness of the first annular portion 5.3 is greater than or equal to 1.5 times the thickness of the third connecting rod 5.2. Each third connecting rod 5.2 abuts against the inner side of its corresponding V-shaped rod. The first elastic rod 5.1 and the second elastic rod 6.2 are both arc-shaped; the first annular portion 5.3 and the second annular portion 6.4 are both elliptical rings. The number of the spiral rods 1 is greater than or equal to 6; the multiple spiral rods 1 are distributed in a ring at equal intervals; the pitch of the spiral rods 1 is equal from the proximal end to the distal end.

[0055] The first support unit includes a plurality of first developing rings 8 and a plurality of second developing rings 9. Each first developing ring 8 is fixedly connected to two adjacent first connecting rods 2.1, and each second developing ring 9 is fixedly connected to two adjacent second connecting rods 3.1. A third developing ring 5.5 located within the first annular portion 5.3 is fixed at each first annular portion 5.3, and a fourth developing ring 6.6 located within the second annular portion 6.4 is fixed at each second annular portion 6.4. The inverted V-shaped rod includes two first transition rods 2.2, two first main rods 2.3, and a first arc-shaped rod 2.4. The first arc-shaped rod 2.4 connects the two first main rods 2.3, and the first transition rod 2.2 connects the first connecting rod 2.1 and the first main rod 2.3. The V-shaped rod includes two second transition rods 3.2, two second main rods 3.3, and a second arc-shaped rod 3.4. The second arc-shaped rod 3.4 connects the two second main rods 3.3, and the second transition rod 3.2 connects the second connecting rod 3.1 and the second main rod 3.3. Both the first transition rod 2.2 and the second transition rod 3.2 are arc-shaped.

[0056] The second support body includes multiple first straight rods 4.1 arranged in a ring with equal spacing, multiple second straight rods 4.2 arranged in a ring with equal spacing, multiple inverted V-shaped first connecting frames 4.3, and multiple V-shaped second connecting frames 4.4. The number of first straight rods 4.1, second straight rods 4.2, first connecting frames 4.3, and second connecting frames 4.4 are equal. The number of first straight rods 4.1, third end units, and fourth end units are equal. The proximal end of each first straight rod 4.1 is connected to a first elastic rod 5.1, and the distal end is connected to a first connecting frame 4. The system consists of three connections: the proximal end of each second straight rod 4.2 is connected to the first connecting frame 4.3, and the distal end is connected to the second connecting frame 4.4; each second connecting frame 4.4 is connected to the extension rod 6.1; each first connecting frame 4.3 is connected to one first straight rod 4.1 and two second straight rods 4.2; and each second connecting frame 4.4 is connected to one extension rod 6.1 and two second straight rods 4.2; multiple fifth connecting rods 4.5 connect adjacent first straight rods 4.1, and multiple sixth connecting rods 4.6 connect adjacent second straight rods 4.2. The number of first straight rods 4.1, second straight rods 4.2, first connecting frames 4.3, and second connecting frames 4.4 are all eight. The length of the second straight rod 4.2 is greater than or equal to the length of the first straight rod 4.1. The number of fifth connecting rods 4.5 between two adjacent first straight rods 4.1 is greater than or equal to the number of sixth connecting rods 4.6 between two adjacent second straight rods 4.2. The shape of the fifth connecting rod 4.5 is part of a spiral, and the shape of the sixth connecting rod 4.6 is part of a spiral. The number of fifth connecting rods 4.5 between two adjacent first straight rods 4.1 is 4, and the number of sixth connecting rods 4.6 between two adjacent second straight rods 4.2 is 3.

[0057] Working Principle: The venous stent of this application includes a first stent unit and a second stent unit. The first stent unit can be used alone or together with the second stent unit. During deployment, the first stent unit can be deployed first, followed by the second stent unit. The spiral rod of the first stent unit can cause blood to rotate along a spiral path, effectively transforming turbulent blood flow into a more ordered, laminar rotating blood flow, thereby reducing turbulence and the probability of thrombus formation. Furthermore, the first stent unit can be anchored using a first barb and a second barb. After deploying the first stent unit, the second stent unit can be deployed. After deployment, the second stent unit can be embedded in a V-shaped rod using a first annular portion, thus forming a limiting fit between the first annular portion and the V-shaped rod. A limiting block is inserted into the first annular portion, further enhancing the anchoring fit between the first and second stent units. The second stent unit can also abut against the vessel wall via a first arc-shaped abutment rod and a second arc-shaped abutment rod, achieving anchoring between the second stent unit itself and the vessel. Thus, the first and second stent units can be well anchored to the blood vessel, and the first and second stent units can be positioned and limited by the V-shaped rod and the first annular portion, as well as by the limiting block and the first annular portion. Therefore, the first and second stent units can function as a single unit.

[0058] Furthermore, the first stent unit has multiple helical rods, which are relatively densely packed, thus providing better radial support characteristics. In addition, the section of the second stent unit closer to the first stent unit has relatively more fifth connecting rods, while the section farther from the first stent unit has relatively fewer sixth connecting rods. Therefore, the section of the second stent unit closer to the heart has better radial support than the section farther from the heart, and the end of the second stent unit farther from the heart has better flexibility than the section closer to the heart, thus better meeting the needs of actual intravascular use.

[0059] 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, characterized in that, The system includes a first support unit and a second support unit. The first support unit includes a first support body, multiple first end units connected to the proximal end of the first support body, and multiple second end units connected to the distal end of the first support body. The first support body includes multiple helical rods, with each pair of adjacent helical rods connecting a first end unit and a second end unit. Each first end unit includes two first connecting rods fixedly connected to the ends of the helical rods and a rounded V-shaped rod connecting the two first connecting rods. Each second end unit includes two second connecting rods fixedly connected to the ends of the helical rods and a rounded V-shaped rod connecting the two second connecting rods. The second support unit includes a second support body, multiple third end units fixedly connected to the proximal end of the second support body, and multiple fourth end units fixedly connected to the distal end of the second support body. Each third end unit includes a first elastic rod, a third connecting rod fixedly connected to the first elastic rod, and a first annular portion fixedly connected to the third connecting rod. Each fourth end unit includes an extension rod, a second elastic rod fixedly connected to the extension rod, a fourth connecting rod fixedly connected to the second elastic rod, and a second annular portion fixedly connected to the fourth connecting rod. A first barb is fixed to the inverted V-shaped rod, and a second barb is fixed to the V-shaped rod; a first arc-shaped abutment rod is fixedly connected to the first annular portion, and a second arc-shaped abutment rod is fixed to the second annular portion; the number of V-shaped rods and the number of first annular portions are equal and they correspond one-to-one; the first annular portion is embedded in the corresponding V-shaped rod; two limiting portions are fixed to the V-shaped rod, and the limiting portion includes a connecting block fixedly connected to the V-shaped rod, an extension plate fixedly connected to the connecting block, and a limiting block fixedly connected to the extension plate; the limiting block is inserted into the first annular portion.

2. The venous stent according to claim 1, characterized in that, Each third connecting rod abuts against the corresponding V-shaped rod, and the thickness of the first annular portion is greater than or equal to 1.5 times the thickness of the third connecting rod.

3. The venous stent according to claim 1, characterized in that, Both the first elastic rod and the second elastic rod are arc-shaped; both the first annular portion and the second annular portion are elliptical rings.

4. The venous stent according to claim 1, characterized in that, The number of the spiral rods is greater than or equal to 6; the multiple spiral rods are distributed in a ring with equal spacing; the pitch of the spiral rods is equal from the proximal end to the distal end, or the pitch of the spiral rods gradually increases from the proximal end to the distal end.

5. The venous stent according to claim 1, characterized in that, The first support unit includes a plurality of first developing rings and a plurality of second developing rings. Each first developing ring is fixedly connected to two adjacent first connecting rods, and each second developing ring is fixedly connected to two adjacent second connecting rods. A third developing ring is fixedly located within the first annular portion at each first annular portion, and a fourth developing ring is fixedly located within the second annular portion at each second annular portion.

6. The venous stent according to claim 1, characterized in that, The inverted V-shaped rod includes two first transition rods, two first main rods, and a first arc-shaped rod. The first arc-shaped rod connects the two first main rods, and the first transition rod connects the first connecting rod and the first main rod. The V-shaped rod includes two second transition rods, two second main rods, and a second arc-shaped rod. The second arc-shaped rod connects the two second main rods, and the second transition rod connects the second connecting rod and the second main rod. Both the first transition rod and the second transition rod are arc-shaped.

7. The venous stent according to claim 1, characterized in that, The second support body includes multiple first straight rods distributed in a ring at equal intervals, multiple second straight rods distributed in a ring at equal intervals, multiple inverted V-shaped first connecting frames, and multiple V-shaped second connecting frames. The number of first straight rods, second straight rods, first connecting frames, and second connecting frames is equal. The number of first straight rods, third end units, and fourth end units is equal. The proximal end of each first straight rod is connected to a first elastic rod, and the distal end is connected to a first connecting frame. The proximal end of each second straight rod is connected to a first connecting frame, and the distal end is connected to a second connecting frame. Each second connecting frame is connected to an extension rod. Each first connecting frame is connected to one first straight rod and two second straight rods. Each second connecting frame is connected to one extension rod and two second straight rods. Multiple fifth connecting rods connect adjacent two first straight rods, and multiple sixth connecting rods connect adjacent two second straight rods.

8. The venous stent according to claim 7, characterized in that, The number of the first straight rod, the second straight rod, the first connecting frame, and the second connecting frame are all 6-8.

9. The venous stent according to claim 7, characterized in that, The length of the second straight rod is greater than or equal to the length of the first straight rod, and the number of fifth connecting rods between two adjacent first straight rods is greater than or equal to the number of sixth connecting rods between two adjacent second straight rods; the shape of the fifth connecting rod is a part of a spiral, and the shape of the sixth connecting rod is a part of a spiral; the number of fifth connecting rods between two adjacent first straight rods is 4-6, and the number of sixth connecting rods between two adjacent second straight rods is 3-5.

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