Vein stent with high anchoring stability

Abstract

The invention discloses a large vein stent, and particularly discloses a vein stent with high anchoring stability, which comprises a first stent part, a second stent part, a connecting part, a third stent part and an anchoring part, the connecting part is connected with the first stent part and the second stent part, the third stent part is fixedly connected with the anchoring part, the anchoring part comprises two second connecting rods, an end developing rod and a plurality of third developing rods are connected between the two second connecting rods, and a plurality of anchoring barbs are fixed at the second connecting rods. The intravenous stent is provided with the three stent parts, so that the intravenous stent is suitable for complex lesions at the blood vessel intersection position, and the multiple stent parts are combined for use, so that the intravenous stent is more targeted to the complex lesions. And a plurality of developing units are arranged, so that the positioning is more accurate when the stent is released. And the anchoring is more stable due to the combined anchoring of the plurality of bracket parts.

Description

Technical Field

[0001] The present invention relates to the technical field of venous stents, and more particularly to a venous stent with high anchoring stability. Background Art

[0002] Venous stents, particularly large venous stents, play a crucial role in treating venous disease, particularly in thicker veins. Without venous stents, lesions like venous stenosis can typically only be treated with medication or surgery, but maintaining long-term venous patency is often difficult. Venous stents, however, provide radial support for venous lesions and are therefore crucial for the treatment of vascular disease.

[0003] There are many locations of blood vessels in the human body, and they come in many shapes and sizes. Some venous diseases only require the placement of a single-segment venous stent. The surgical difficulty is relatively low, and the design of the venous stent is relatively easy. However, some blood vessels, such as the inferior vena cava, left common iliac vein, right common iliac vein, external iliac vein, and internal iliac vein, often have two blood vessels merging into one blood vessel, and the three are distributed in an inverted Y shape. If two of the blood vessels have lesions, and the lesions are located close to the intersection, the requirements for the stents needed are often higher, because different locations have different requirements for the radial support strength and flexibility of the stent. And for these large venous stents, the anchoring of the stent is also extremely important under the influence of blood flow after the stent is installed. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provide a venous stent with high anchoring stability.

[0005] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a venous stent, comprising a first stent portion, a second stent portion, a connecting portion, a third stent portion and an anchoring portion; the connecting portion connects the first stent portion and the second stent portion, the connecting portion comprises two first connecting rods, two upper rod bodies and two lower rod bodies, the two first connecting rods correspond one-to-one to the two upper rod bodies, an upper developing rod is connected between the corresponding first connecting rods and the upper rod bodies, the two first connecting rods correspond one-to-one to the two lower rod bodies, a lower developing rod is connected between the corresponding first connecting rods and the lower rod bodies; a plurality of first developing rods and a plurality of second developing rods are connected between the two first connecting rods; the third stent portion is fixedly connected to the anchoring portion, the anchoring portion comprises two second connecting rods, an end developing rod and a plurality of third developing rods are connected between the two second connecting rods, and a plurality of anchoring barbs are fixed at the second connecting rod.

[0006] Furthermore, the first stent portion, the second stent portion and the third stent portion are all self-expanding stents.

[0007] Furthermore, the first bracket portion, the second bracket portion and the third bracket portion are all made of memory alloy material.

[0008] Furthermore, the first connecting rod includes a first rod body fixedly connected to the first bracket portion, a second rod body fixedly connected to the second bracket portion, and a first transition rod body connecting the first rod body and the second rod body, multiple first developing rods are connected between the two first transition rod bodies, and multiple second developing rods are connected between the two second rod bodies.

[0009] Furthermore, the second connecting rod includes a third rod body, a second transition rod body connected to the third rod body, and a fourth rod body connected to the second transition rod body, the third bracket portion is connected to the fourth rod body, a plurality of anchoring barbs are connected to the third rod body, and the third developing rod is connected between the two third rod bodies.

[0010] Therefore, the upper developing rod, the lower developing rod, the end developing rod, the first developing rod, the second developing rod and the third developing rod can play both a connecting role and a developing role.

[0011] Furthermore, the connecting portion and the anchoring portion can be in an assembled state, in which the two third rod bodies are located between the two second rod bodies, and each anchoring barb is located between two adjacent second developing rods.

[0012] Furthermore, the upper developing rod, the lower developing rod, the end developing rod, the first developing rod, the second developing rod and the third developing rod are all made of developing material.

[0013] Furthermore, the upper developing rod, the lower developing rod, the end developing rod, the first developing rod, the second developing rod and the third developing rod are all fixed by laser welding.

[0014] Furthermore, the number of the first developing rods is greater than or equal to four.

[0015] Furthermore, the number of the second developing rods is greater than or equal to 6, and they are distributed in a row with equal intervals.

[0016] Furthermore, the number of the third developing rods is between 1 and 4.

[0017] Furthermore, each third rod body has more than two anchoring barbs, and at least one anchoring barb is connected to the end of the third rod body.

[0018] Furthermore, the multiple anchoring barbs on the same third rod are distributed in a row with equal intervals.

[0019] Furthermore, the upper developing rod is U-shaped, with two ends connected to the end of the first rod body and the end of the upper rod body respectively.

[0020] Furthermore, the lower developing rod is U-shaped, with two ends connected to the end of the second rod body and the end of the lower rod body respectively.

[0021] Furthermore, the end developing rod is U-shaped, and both ends are respectively connected to the ends of the two fourth rod bodies.

[0022] Furthermore, the two first rod bodies and the two upper rod bodies correspond to each other one by one, and a wavy upper reinforcement rod is connected between the corresponding first rod bodies and upper rod bodies.

[0023] Furthermore, the two second rod bodies correspond to the two lower rod bodies one by one, and a wavy lower reinforcement rod is connected between the corresponding second rod bodies and the lower rod bodies.

[0024] Furthermore, a wave-shaped reinforcement connecting rod is connected between the two fourth rod bodies.

[0025] Furthermore, one end of the first bracket portion away from the first transition rod body is connected to a plurality of first end rods, and the first end rods are connected to first barbs.

[0026] Furthermore, one end of the second bracket portion away from the first transition rod body is connected to a plurality of second end rods, and the second end rods are connected to second barbs.

[0027] Furthermore, one end of the third bracket portion is connected to a plurality of third end rods, and the other end is connected to a plurality of fourth end rods, the third end rods are connected to third barbs, and the fourth end rods are connected to fourth barbs.

[0028] Thus, the multiple barbs make the fixation of the stent to the blood vessel more stable.

[0029] Furthermore, the number of the first barbs is greater than or equal to 2.

[0030] Furthermore, the number of the second barbs is greater than or equal to 2.

[0031] Furthermore, the number of the third barbs is greater than or equal to 2.

[0032] Furthermore, the number of the fourth barbs is greater than or equal to 2.

[0033] Furthermore, the first bracket portion and the first rod body are fixed by welding, preferably by laser welding.

[0034] Furthermore, the second bracket portion and the second rod body are fixed by welding, preferably by laser welding.

[0035] Furthermore, the third bracket portion and the fourth rod body are fixed by welding, preferably by laser welding.

[0036] Furthermore, the first bracket portion includes a plurality of first spiral rods and a plurality of second spiral rods, and the spiral directions of the first spiral rods and the second spiral rods are opposite.

[0037] Furthermore, the second bracket portion includes a plurality of third spiral rods and a plurality of fourth spiral rods, and the spiral directions of the third spiral rods and the fourth spiral rods are opposite.

[0038] Furthermore, the third bracket portion includes a plurality of fifth spiral rods and a plurality of sixth spiral rods, and the fifth spiral rods and the sixth spiral rods have opposite spiral directions.

[0039] Furthermore, the length of the second bracket portion is greater than the length of the first bracket portion.

[0040] Furthermore, the pitches of the first screw rod and the second screw rod are equal.

[0041] Furthermore, the pitches of the third helical rod and the fourth helical rod are equal.

[0042] Furthermore, the pitches of the fifth helical rod and the sixth helical rod are equal.

[0043] Furthermore, the pitch of the first screw rod is smaller than the pitch of the third screw rod.

[0044] Therefore, the radial supporting effect of the first bracket portion is better and the flexibility of the second bracket portion is better.

[0045] Furthermore, the pitch of the third screw rod is equal to the pitch of the fifth screw rod.

[0046] As required, the first bracket portion, the second bracket portion, and the third bracket portion may also have other structural types, such as a sinusoidal shape or a diamond-shaped mesh.

[0047] Furthermore, one end of the first bracket portion away from the first transition rod body is connected to a plurality of first developing rings.

[0048] Furthermore, one end of the second bracket portion away from the first transition rod body is connected to a plurality of second developing rings.

[0049] Furthermore, one end of the third bracket portion is connected to a plurality of third developing rings.

[0050] Furthermore, the other end of the third bracket portion is connected to a plurality of fourth developing rings.

[0051] Thereby, better positioning of the first bracket part, the second bracket part and the third bracket part can be achieved.

[0052] Beneficial effects:

[0053] 1. The venous stent of the present application has three stent parts, and is therefore suitable for treating complex lesions at the intersection of blood vessels. The combined use of multiple stent parts makes it more targeted for treating complex lesions.

[0054] 2. The venous stent of the present application has multiple developing units, so that the positioning is more accurate when the stent is released.

[0055] 3. The venous stent of the present application is anchored by combining several stent parts, making the anchoring more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic diagram from a first perspective when the second bracket portion and the third bracket portion are not assembled; 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 is a schematic diagram from a second perspective when the second bracket portion and the third bracket portion are not assembled; Figure 6 This is an enlarged view of area D; Figure 7 This is an enlarged view of area E; Figure 8 This is an enlarged view of area F; Figure 9 A schematic diagram showing the assembly of the second bracket portion and the third bracket portion from a first perspective; 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 second bracket portion and the third bracket portion being assembled from a second perspective; Figure 13 This is an enlarged view of area I.

[0057] Explanation of the accompanying drawings: first bracket part 1; first developing ring 1.1; second bracket part 2; second developing ring 2.1; third bracket part 3; third developing ring 3.1; fourth developing ring 3.2; connecting part 4; first rod body 4.1; second rod body 4.2; first transition rod body 4.3; upper rod body 4.4; lower rod body 4.5; upper developing rod 4.6; lower developing rod 4.7; first developing rod 4.8; second developing rod 4.9; upper reinforcement rod 4.10; lower reinforcement rod 4.11; anchoring part 5; third rod body 5.1; second transition rod body 5.2; fourth rod body 5.3; end developing rod 5.4; third developing rod 5.5; anchoring barb 5.6; reinforcement connecting rod 5.7; first end rod 6; first barb 6.1; second end rod 7; second barb 7.1; third end rod 8; third barb 8.1; fourth end rod 9; fourth barb 9.1. DETAILED DESCRIPTION

[0058] 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.

[0059] The present invention provides a venous stent with high anchoring stability as shown in the figure, comprising a first stent part 1, a second stent part 2, a connecting part 4, a third stent part 3 and an anchoring part 5; the connecting part 4 connects the first stent part 1 and the second stent part 2, the connecting part 4 comprises two first connecting rods, two upper rod bodies 4.4 and two lower rod bodies 4.5, the two first connecting rods and the two upper rod bodies 4.4 correspond one to one, an upper developing rod 4.6 is connected between the corresponding first connecting rods and the upper rod bodies 4.4, the two first connecting rods and the two lower rod bodies 4.5 correspond one to one, a lower developing rod 4.7 is connected between the corresponding first connecting rods and the lower rod bodies 4.5; a plurality of first developing rods 4.8 and a plurality of second developing rods 4.9 are connected between the two first connecting rods; the third stent part 3 is fixedly connected to the anchoring part 5, the anchoring part 5 comprises two second connecting rods, an end developing rod 5.4 and a plurality of third developing rods 5.5 are connected between the two second connecting rods, and a plurality of anchoring barbs 5.6 are fixed at the second connecting rods. The first connecting rod includes a first rod body 4.1 fixedly connected to the first bracket part 1, a second rod body 4.2 fixedly connected to the second bracket part 2, and a first transition rod body 4.3 connecting the first rod body 4.1 and the second rod body 4.2, a plurality of first developing rods 4.8 are connected between the two first transition rod bodies 4.3, and a plurality of second developing rods 4.9 are connected between the two second rod bodies 4.2; the second connecting rod includes a third rod body 5.1, a second transition rod body 5.2 connected to the third rod body 5.1, and a fourth rod body 5.3 connected to the second transition rod body 5.2, the third bracket part 3 is connected to the fourth rod body 5.3, a plurality of anchoring barbs 5.6 are connected to the third rod body 5.1, and the third developing rod 5.5 is connected between the two third rod bodies 5.1; the connecting part 4 and the anchoring part 5 can be in an assembled state, in which the two third rod bodies 5.1 are located between the two second rod bodies 4.2, and each anchoring barb 5.6 is located between two adjacent second developing rods 4.9.

[0060] The number of first developing rods 4.8 is greater than or equal to 4; the number of second developing rods 4.9 is greater than or equal to 6 and is evenly spaced in a row; the number of third developing rods 5.5 is between 1 and 4; each third rod 5.1 has two or more anchoring barbs 5.6, at least one of which is connected to the end of the third rod 5.1. The upper developing rod 4.6 is U-shaped, with its ends connected to the ends of the first rod 4.1 and the upper rod 4.4, respectively. The lower developing rod 4.7 is U-shaped, with its ends connected to the ends of the second rod 4.2 and the lower rod 4.5, respectively. The end developing rod 5.4 is U-shaped, with its ends connected to the ends of the two fourth rods 5.3, respectively. The two first rods 4.1 correspond to the two upper rods 4.4 in a one-to-one relationship, with a wavy upper reinforcement rod 4.10 connected between the corresponding first rods 4.1 and upper rods 4.4. The two second rods 4.2 correspond to the two lower rods 4.5 in a one-to-one relationship, with a wavy lower reinforcement rod 4.11 connected between the corresponding second rods 4.2 and lower rods 4.5. A wavy reinforcement connecting rod 5.7 is connected between the two fourth rods 5.3. A plurality of first end rods 6 are connected to the end of the first bracket portion 1 away from the first transition rod 4.3, and the first end rods 6 are connected to first barbs 6.1. A plurality of second end rods 7 are connected to the end of the second bracket portion 2 away from the first transition rod 4.3, and the second end rods 7 are connected to second barbs 7.1. A plurality of third end rods 8 are connected to one end of the third bracket portion 3, and a plurality of fourth end rods 9 are connected to the other end, and the third end rods 8 are connected to third barbs 8.1, and the fourth end rods 9 are connected to fourth barbs 9.1. The first bracket portion 1 includes multiple first and second spiral rods, with the first and second spiral rods having opposite thread directions. The second bracket portion 2 includes multiple third and fourth spiral rods, with the third and fourth spiral rods having opposite thread directions. The third bracket portion 3 includes multiple fifth and sixth spiral rods, with the fifth and sixth spiral rods having opposite thread directions. The end of the first bracket portion 1 away from the first transition rod body 4.3 is connected to multiple first developing rings 1.1. The end of the second bracket portion 2 away from the first transition rod body 4.3 is connected to multiple second developing rings 2.1. The third bracket portion 3 is connected to multiple third developing rings 3.1 at one end and multiple fourth developing rings 3.2 at the other end.

[0061] Working Principle: The venous stent of the present application consists of two separable parts: a first stent portion, a second stent portion, and a connecting portion, and a third stent portion and an anchoring portion. The first and second portions are separate. In some conditions, the first portion can be used alone. After the first portion is pushed into a desired location using a sheath (e.g., at the intersection of the inferior vena cava, left common iliac vein, and right common iliac vein, where positioning is achieved using a first developing ring, a second developing ring, and a first developing rod), the first stent portion is positioned within the inferior vena cava and the second stent portion within the left common iliac vein. As the first and second stent portions self-expand, the first and second barbs anchor to the inner wall of the vessel, further stabilizing the stent's position within the vessel. The first and second stent portions are connected by a connecting portion, with a first transition rod located at the intersection. This first transition rod provides greater connection flexibility while minimizing the impact of the intersection. The connection between the first and second stent portions enhances overall stability within the vessel.

[0062] If disease persists in other sections of the blood vessel where the second stent portion is located, the second portion can be released after the first portion. The third and fourth developing rings can be used to position the third stent portion. The second developing ring and third developing rod can be used to coordinate the positions of the second and third rods. As the third stent portion expands, each anchoring barb can be positioned between two adjacent second developing rods. Because there are a large number of second developing rods, the anchoring barbs can be easily inserted between two second developing rods and anchored to the inner wall of the blood vessel. Furthermore, because there are a large number of second developing rods, the relative position of the third stent portion and the second stent portion can be adjusted by selecting the insertion position of the second developing rods. As the third stent portion completes its self-expansion, the third and fourth barbs also anchor to the inner wall of the blood vessel. This allows the first, second, and third stent portions to form a single unit, further stabilizing their position within the blood vessel.

[0063] 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 with high anchoring stability, characterized in that: The cam is connected to the second bracket part, and the connecting part includes two first connecting rods, two upper rod bodies and two lower rod bodies. The two first connecting rods correspond to the two upper rod bodies one by one, and an upper developing rod is connected between the corresponding first connecting rods and the upper rod bodies. The two first connecting rods correspond to the two lower rod bodies one by one, and a lower developing rod is connected between the corresponding first connecting rods and the lower rod bodies. A plurality of first developing rods and a plurality of second developing rods are connected between the two first connecting rods. The third bracket part is fixedly connected to the anchor part, and the anchor part includes two second connecting rods. An end developing rod and a plurality of third developing rods are connected between the two second connecting rods. A plurality of anchoring barbs are fixed at the second connecting rod.

2. The venous stent with high anchoring stability according to claim 1, characterized in that: The first connecting rod includes a first rod body fixedly connected to the first bracket portion, a second rod body fixedly connected to the second bracket portion, and a first transition rod body connecting the first rod body and the second rod body, multiple first developing rods are connected between the two first transition rod bodies, and multiple second developing rods are connected between the two second rod bodies; the second connecting rod includes a third rod body, a second transition rod body connected to the third rod body, and a fourth rod body connected to the second transition rod body, the third bracket portion is connected to the fourth rod body, multiple anchoring barbs are connected to the third rod body, and the third developing rod is connected between the two third rod bodies; the connecting portion and the anchoring portion can be in an assembled state, in which the two third rod bodies are located between the two second rod bodies, and each anchoring barb is located between two adjacent second developing rods.

3. The venous stent with high anchoring stability according to claim 2, characterized in that: The number of first developing rods is greater than or equal to 4; the number of second developing rods is greater than or equal to 6 and is distributed in a row with equal spacing; the number of third developing rods is between 1 and 4; each third rod body has more than two anchoring barbs, and at least one anchoring barb is connected to the end of the third rod body.

4. The venous stent with high anchoring stability according to claim 2, characterized in that: The upper developing rod is U-shaped, with its two ends connected to the end of the first rod body and the end of the upper rod body respectively; the lower developing rod is U-shaped, with its two ends connected to the end of the second rod body and the end of the lower rod body respectively; the end developing rod is U-shaped, with its two ends connected to the ends of the two fourth rod bodies respectively.

5. The venous stent with high anchoring stability according to claim 2, characterized in that: The two first rod bodies correspond one to one with the two upper rod bodies, and a wavy upper reinforcement rod is connected between the corresponding first rod bodies and the upper rod bodies; the two second rod bodies correspond one to one with the two lower rod bodies, and a wavy lower reinforcement rod is connected between the corresponding second rod bodies and the lower rod bodies; and a wavy reinforcement connecting rod is connected between the two fourth rod bodies.

6. The venous stent with high anchoring stability according to claim 2, characterized in that: One end of the first bracket portion away from the first transition rod body is connected to a plurality of first end rods, and the first end rods are connected to a first barb; one end of the second bracket portion away from the first transition rod body is connected to a plurality of second end rods, and the second end rods are connected to a second barb; one end of the third bracket portion is connected to a plurality of third end rods, and the other end is connected to a plurality of fourth end rods, the third end rods are connected to a third barb, and the fourth end rods are connected to a fourth barb.

7. The venous stent with high anchoring stability according to claim 2, characterized in that: The first bracket portion includes a plurality of first spiral rods and a plurality of second spiral rods, and the spiral directions of the first spiral rods and the second spiral rods are opposite; the second bracket portion includes a plurality of third spiral rods and a plurality of fourth spiral rods, and the spiral directions of the third spiral rods and the fourth spiral rods are opposite; the third bracket portion includes a plurality of fifth spiral rods and a plurality of sixth spiral rods, and the spiral directions of the fifth spiral rods and the sixth spiral rods are opposite.

8. The venous stent with high anchoring stability according to claim 2, characterized in that: One end of the first bracket part away from the first transition rod body is connected to multiple first developing rings; one end of the second bracket part away from the first transition rod body is connected to multiple second developing rings; one end of the third bracket part is connected to multiple third developing rings, and the other end is connected to multiple fourth developing rings.

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