A vein stent with high anchoring stability

Abstract

This application discloses a large venous stent, specifically a venous stent with high anchoring stability, 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 and second stent portions, and the third stent portion is fixedly connected to the anchoring portion. The anchoring portion includes two second connecting rods, with an end-illuminating rod and multiple third illuminating rods connected between the two second connecting rods. Multiple anchoring barbs are fixed at the second connecting rods. This venous stent has three stent portions, making it suitable for complex lesions at vascular junctions. The combined use of multiple stent portions makes it more targeted for complex lesions. Furthermore, it has multiple illuminating units, resulting in more precise positioning during stent release. The combined anchoring of several stent portions makes the anchoring more stable.

Description

Technical Field

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

[0002] Venous stents play a crucial role in treating venous diseases, especially in the treatment of larger veins with more prominent veins. Without stents, venous stenosis and other lesions typically require medication or surgery, which often fails to maintain long-term venous patency. Venous stents provide radial support to the affected vein, thus offering significant advantages in the treatment of vascular diseases.

[0003] Blood vessels are found in many locations and come in various shapes and sizes throughout the human body. Some venous diseases can be treated with a single-segment stent, making the surgery relatively simple and the stent design relatively straightforward. However, in other venous locations, such as the inferior vena cava, left common iliac vein, right common iliac vein, external iliac vein, and internal iliac vein, two vessels often converge into one, forming an inverted Y-shape. If two of these vessels are diseased, especially if the lesion is near the confluence, the required stent often has higher requirements because the radial support strength and flexibility of the stent differ depending on the location. Furthermore, for these large venous stents, the anchorage of the stent after placement is extremely important due to the influence of blood flow. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention provides the following technical solution: 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, and the connecting portion includes two first connecting rods, two upper rod bodies, and two lower rod bodies, with each of the two first connecting rods and the two upper rod bodies corresponding one-to-one, and an upper imaging rod connecting the corresponding first connecting rod and the upper rod body; each of the two first connecting rods and the two lower rod bodies corresponds one-to-one, and a lower imaging rod connecting the corresponding first connecting rod and the lower rod body; multiple first imaging rods and multiple second imaging rods are connected between the two first connecting rods; the third stent portion is fixedly connected to the anchoring portion, and the anchoring portion includes two second connecting rods, with an end imaging rod and multiple third imaging rods connected between the two second connecting rods, and multiple anchoring barbs fixed at the second connecting rods.

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

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

[0008] Furthermore, the first connecting rod includes a first rod body fixedly connected to the first support portion, a second rod body fixedly connected to the second support portion, and a first transition rod body connecting the first rod body and the second rod body. Multiple first developing rods are connected between two first transition rod bodies, and multiple second developing rods are connected between 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 support portion is connected to the fourth rod body, and multiple anchoring barbs are connected to the third rod body. The third developing rod is connected between the two third rod bodies.

[0010] Thus, the upper developing rod, lower developing rod, end developing rod, first developing rod, second developing rod, and third developing rod can both serve as a connector and as a developing rod.

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

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

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

[0014] Furthermore, the number of first developing rods is greater than or equal to 4.

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

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

[0017] Furthermore, each third rod has two or more anchoring barbs, at least one of which is connected to the end of the third rod.

[0018] Furthermore, multiple anchoring barbs at the same third rod are arranged in a row with equal spacing.

[0019] Furthermore, 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.

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

[0021] Furthermore, the end developing rod is U-shaped, with its two ends connected to the ends of two fourth rods respectively.

[0022] Furthermore, the two first rods and the two upper rods correspond one-to-one, and the corresponding first rods and upper rods are connected by a wave-shaped upper reinforcing rod.

[0023] Furthermore, the two second rods and the two lower rods correspond one-to-one, and the corresponding second rods and lower rods are connected by a wave-shaped lower reinforcing rod.

[0024] Furthermore, a wave-shaped reinforcing connecting rod connects the two fourth rods.

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

[0026] Furthermore, the end of the second support portion away from the first transition rod 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 support portion is connected to multiple third end rods, and the other end is connected to multiple fourth end rods. The third end rods are connected to third barbs, and the fourth end rods are connected to fourth barbs.

[0028] 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 second barbs is greater than or equal to 2.

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

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

[0033] Furthermore, the first support portion is welded and fixed to the first rod body, preferably by laser welding.

[0034] Furthermore, the second support portion is welded and fixed to the second rod body, preferably by laser welding.

[0035] Furthermore, the third support portion is welded and fixed to the fourth rod, preferably by laser welding.

[0036] Furthermore, the first support portion includes a plurality of first helical rods and a plurality of second helical rods, the first helical rods and the second helical rods having opposite directions of screwing.

[0037] Furthermore, the second support section includes multiple third helical rods and multiple fourth helical rods, with the third and fourth helical rods having opposite directions of screwing.

[0038] Furthermore, the third support section includes multiple fifth helical rods and multiple sixth helical rods, with the fifth and sixth helical rods having opposite spiral directions.

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

[0040] Furthermore, the pitches of the first and second helical rods are equal.

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

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

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

[0044] This results in better radial support for the first support section and better flexibility for the second support section.

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

[0046] Depending on the needs, the first, second, and third support sections can also be selected from other structural types. For example, they can be sinusoidal or have diamond-shaped mesh.

[0047] Furthermore, a plurality of first imaging rings are connected to the end of the first support portion away from the first transition rod.

[0048] Furthermore, a plurality of second imaging rings are connected to the end of the second support portion away from the first transition rod.

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

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

[0051] This allows for better positioning of the first support section, the second support section, and the third support section.

[0052] Beneficial effects:

[0053] 1. The venous stent of this application has three stent sections, which makes it suitable for complex lesions at the junction of blood vessels. The combined use of multiple stent sections makes it more targeted for complex lesions.

[0054] 2. The venous stent of this application has multiple imaging units, thereby enabling more precise positioning during stent deployment.

[0055] 3. The venous stent of this application, with its combination and anchoring of several stent parts, makes the anchoring more stable. Attached Figure Description

[0056] Figure 1 This is a first-view diagram showing the second and third support sections without being assembled. Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 for Figure 1 Enlarged view of region B in the middle; Figure 4 for Figure 1 Enlarged view of region C; Figure 5 This is a second-view diagram showing the second and third support sections without being assembled. Figure 6 for Figure 5 Enlarged view of region D in the middle; Figure 7 for Figure 5 Enlarged view of region E in the middle; Figure 8 for Figure 5 Enlarged view of the middle F region; Figure 9 A first-view diagram showing the assembly of the second and third support sections; Figure 10 for Figure 9 Enlarged view of region G in the middle; Figure 11 for Figure 9 Enlarged view of region H in the middle; Figure 12 A second-view diagram illustrating the assembly of the second and third support sections; Figure 13 for Figure 12 Enlarged view of region I in the middle.

[0057] Explanation of reference numerals in the attached drawings: First support part 1; First developing ring 1.1; Second support part 2; Second developing ring 2.1; Third support 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 reinforcing rod 4.10; Lower reinforcing 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; Reinforcing 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 Implementation

[0058] 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.

[0059] This invention provides a venous stent with high anchoring stability, as shown in the figure, comprising a first stent portion 1, a second stent portion 2, a connecting portion 4, a third stent portion 3, and an anchoring portion 5. The connecting portion 4 connects the first stent portion 1 and the second stent portion 2. The connecting portion 4 includes 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, and an upper imaging rod 4.6 connects the corresponding first connecting rod and the upper rod body 4.4. The two first connecting rods and the two lower rod bodies 4.5 correspond one-to-one, and a lower imaging rod 4.7 connects the corresponding first connecting rod and the lower rod body 4.5. Multiple first imaging rods 4.8 and multiple second imaging rods 4.9 are connected between the two first connecting rods. The third stent portion 3 is fixedly connected to the anchoring portion 5. The anchoring portion 5 includes two second connecting rods, and an end imaging rod 5.4 and multiple third imaging rods 5.5 are connected between the two second connecting rods. Multiple 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 support part 1, a second rod body 4.2 fixedly connected to the second support part 2, and a first transition rod body 4.3 connecting the first rod body 4.1 and the second rod body 4.2. Multiple first developing rods 4.8 are connected between two first transition rod bodies 4.3, and multiple second developing rods 4.9 are connected between 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 support part 3 is connected to the fourth rod body 5.3, multiple anchoring barbs 5.6 are connected to the third rod body 5.1, and the third developing rod 5.5 is connected between two third rod bodies 5.1. The connecting part 4 and the anchoring part 5 can be in an assembled state. In the assembled state, two third rod bodies 5.1 are located between 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 they are arranged in a row with equal spacing; 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, and at least one anchoring barb 5.6 is connected to the end of the third rod 5.1. The upper developing rod 4.6 is U-shaped, and its two ends are 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, and its two ends are 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, and its two ends are connected to the ends of the two fourth rods 5.3, respectively. Two first rods 4.1 and two upper rods 4.4 correspond one-to-one, and a wavy upper reinforcing rod 4.10 connects the corresponding first rods 4.1 and upper rods 4.4; two second rods 4.2 and two lower rods 4.5 correspond one-to-one, and a wavy lower reinforcing rod 4.11 connects the corresponding second rods 4.2 and lower rods 4.5; a wavy reinforcing connecting rod 5.7 connects the two fourth rods 5.3. Multiple first end rods 6 are connected to the end of the first support section 1 away from the first transition rod 4.3, and the first end rods 6 are connected to first barbs 6.1; multiple second end rods 7 are connected to the end of the second support section 2 away from the first transition rod 4.3, and the second end rods 7 are connected to second barbs 7.1; multiple third end rods 8 are connected to one end of the third support section 3, and multiple fourth end rods 9 are connected to the other end, 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 support section 1 includes multiple first helical rods and multiple second helical rods, with the first and second helical rods having opposite screw directions; the second support section 2 includes multiple third helical rods and multiple fourth helical rods, with the third and fourth helical rods having opposite screw directions; the third support section 3 includes multiple fifth helical rods and multiple sixth helical rods, with the fifth and sixth helical rods having opposite screw directions. Multiple first developing rings 1.1 are connected to one end of the first support section 1 away from the first transition rod 4.3; multiple second developing rings 2.1 are connected to one end of the second support section 2 away from the first transition rod 4.3; multiple third developing rings 3.1 are connected to one end of the third support section 3, and multiple fourth developing rings 3.2 are connected to the other end.

[0061] Working Principle: The venous stent of this application consists of two separable parts: a first stent portion, a second stent portion, and a connecting portion forming the first part; and a third stent portion and an anchoring portion forming the second part. The first and second parts are separate. In some diseases, the first part can be used alone. After the first part is pushed to a designated location using a sheath (e.g., the intersection of the inferior vena cava, left common iliac vein, and right common iliac vein, and can be positioned using a first contrast ring, a second contrast ring, and a first contrast rod), the first stent portion is located within the inferior vena cava, and the second stent portion is located within the left common iliac vein. With the self-expansion of the first and second stent portions, the first and second barbs can anchor to the inner wall of the blood vessel, thus making the stent's position within the blood vessel more stable. Furthermore, the first and second stent portions are connected by a connecting portion. The first transition rod of the connecting portion is located at the aforementioned intersection. The first transition rod provides better connection flexibility and reduces the impact on the intersection. The connection between the first and second stent portions further enhances overall stability within the blood vessel.

[0062] When other segments of the blood vessel containing the second stent have lesions, the second part can be released after the first part. The third and fourth contrast-enhancing rings can be used to position the third stent, and the second and third contrast-enhancing rods can be used to coordinate the positions of the second and third rods. As the third stent expands, each anchoring barb can be positioned between two adjacent second contrast-enhancing rods. Due to the large number of second contrast-enhancing rods, the anchoring barbs can easily insert between two rods and anchor to the inner wall of the blood vessel. Furthermore, the relative position of the third and second stents can be adjusted by selecting the insertion position of the anchoring barbs. As the third stent completes its self-expansion, the third and fourth barbs also anchor to the inner wall of the blood vessel. Thus, the first, second, and third stents form a unified whole, resulting in a more stable position within the blood vessel.

[0063] 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 with high anchoring stability, characterized in that, The system includes a first support section, a second support section, a third support section, an anchoring section fixedly connected to the third support section, and a connecting section connecting the first and second support sections. The connecting section includes two first connecting rods, two upper rods, and two lower rods. The anchoring section includes two second connecting rods. The first connecting rod includes a first rod fixedly connected to the first support section, a second rod fixedly connected to the second support section, and a first transition rod connecting the first and second rods. The second connecting rod includes a third rod with multiple anchoring barbs, a fourth rod connected to the third support section, and a second transition rod connecting the third and fourth rods. The connecting section and the anchoring section can be in an assembled state. In the assembled state, the two third rods are located between the two second rods, and multiple second developing rods are connected between the two second rods, with each anchoring barb located between two adjacent second developing rods.

2. The venous stent with high anchoring stability according to claim 1, characterized in that, Two first connecting rods correspond one-to-one with two upper rod bodies, and upper developing rods are connected between the corresponding first connecting rods and upper rod bodies. Two first connecting rods correspond one-to-one with two lower rod bodies, and lower developing rods are connected between the corresponding first connecting rods and lower rod bodies. Multiple first developing rods are connected between two first transition rod bodies. End developing rods and multiple third developing rods are connected between two second connecting rods, and the third developing rods are connected between two third rod bodies.

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 they are arranged in a row with equal spacing; the number of third developing rods is between 1 and 4; each third rod has more than two anchoring barbs, and at least one anchoring barb is connected to the end of the third rod.

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 ends of the first rod and the upper rod, respectively; the lower developing rod is U-shaped, with its two ends connected to the ends of the second rod and the lower rod, respectively; the end developing rod is U-shaped, with its two ends connected to the ends of the two fourth rods, respectively.

5. The venous stent with high anchoring stability according to claim 2, characterized in that, Two first rods and two upper rods correspond one-to-one, and the corresponding first rods and upper rods are connected by a wave-shaped upper reinforcing rod; two second rods and two lower rods correspond one-to-one, and the corresponding second rods and lower rods are connected by a wave-shaped lower reinforcing rod; the two fourth rods are connected by a wave-shaped reinforcing connecting rod.

6. The venous stent with high anchoring stability according to claim 2, characterized in that, The first support portion has multiple first end rods connected to one end away from the first transition rod, and the first end rods are connected to first barbs; the second support portion has multiple second end rods connected to one end away from the first transition rod, and the second end rods are connected to second barbs; the third support portion has multiple third end rods connected to one end and multiple fourth end rods connected to the other end, the third end rods are connected to third barbs, and the fourth end rods are connected to fourth barbs.

7. The venous stent with high anchoring stability according to claim 2, characterized in that, The first support section includes multiple first helical rods and multiple second helical rods, with the first and second helical rods having opposite directions of screwing; the second support section includes multiple third helical rods and multiple fourth helical rods, with the third and fourth helical rods having opposite directions of screwing; the third support section includes multiple fifth helical rods and multiple sixth helical rods, with the fifth and sixth helical rods having opposite directions of screwing.

8. The venous stent with high anchoring stability according to claim 2, characterized in that, The first support portion has a plurality of first developing rings connected to one end away from the first transition rod; the second support portion has a plurality of second developing rings connected to one end away from the first transition rod; and the third support portion has a plurality of third developing rings connected to one end and a plurality of fourth developing rings connected to the other end.

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