A venous stent based on a spiral structure

Abstract

This application discloses a venous stent based on a helical structure, comprising multiple helical rods, multiple annular portions, and multiple connecting rods. The helical rods are arranged in the same helical direction and are evenly spaced in a ring. The annular portions surround and are fixedly connected to the helical rods, and the connecting rods are used to connect adjacent annular portions. In this venous stent, the helical rods guide blood to flow in a rotating manner along the vessel wall, mimicking the natural helical flow pattern of a healthy vein. The proximal end has better support, and the distal end has better flexibility. Furthermore, it has a first anchoring annular portion, a second anchoring annular portion, and a third anchoring annular portion, thereby achieving better anchoring with the vessel wall and preventing displacement after stent placement.

Description

Technical Field

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

[0002] A venous stent is a tiny, mesh-like metal tube implanted inside a vein to support it if it has become narrowed, blocked, or compressed due to disease, restoring its patency and normal blood flow. Iliac vein stents are typically implanted in the left common iliac vein, with the left common iliac vein, right common iliac vein, and inferior vena cava forming an inverted Y-shape.

[0003] Venous stents implanted in the left common iliac vein require good support at the proximal end; otherwise, stent deformation and restenosis may occur. Conversely, good flexibility at the distal end is necessary to prevent phlebitis, thrombosis, or stent breakage. Furthermore, the stent's position must not shift after implantation; therefore, some venous stents have additional barbs. However, balancing these factors can sometimes be difficult, making preparation more challenging. Additionally, the implantation of a venous stent impairs blood flow, potentially leading to in-stent thrombosis. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention provides the following technical solution: a venous stent, comprising multiple spiral rods, multiple annular portions, and multiple connecting rods, wherein the multiple spiral rods are arranged in the same spiral direction and are distributed in a ring at equal intervals; the annular portions surround the spiral rods and are fixedly connected to the spiral rods, and the connecting rods are used to connect adjacent annular portions.

[0006] Furthermore, the helical rod and the annular portion are laser welded together for fixation.

[0007] Furthermore, the connecting rod and the ring are laser welded together for fixation.

[0008] Furthermore, the plurality of spiral rods are divided into a plurality of first spiral rods, a plurality of second spiral rods, and a plurality of third spiral rods, wherein the length of the first spiral rod is less than the length of the second spiral rod, and the length of the second spiral rod is less than the length of the third spiral rod; the plurality of annular portions are a plurality of first annular portions, a plurality of second annular portions, and a plurality of third annular portions, wherein each first annular portion surrounds and is fixedly connected to all the first, second, and third spiral rods, each second annular portion surrounds and is fixedly connected to all the second and third spiral rods, and each third annular portion surrounds and is fixedly connected to all the third spiral rods.

[0009] This allows multiple spiral rods to guide the blood to rotate and flow along the vessel wall, mimicking the natural spiral flow pattern of a healthy vein.

[0010] Furthermore, multiple first circular portions are distributed at equal intervals along the length of the venous stent, multiple second circular portions are distributed at equal intervals along the length of the venous stent, and multiple third circular portions are distributed at equal intervals along the length of the venous stent.

[0011] Furthermore, the spacing between adjacent first annular portions is smaller than the spacing between adjacent second annular portions, and the spacing between adjacent second annular portions is smaller than the spacing between adjacent third annular portions.

[0012] This results in the venous stent having better support at the proximal end and better flexibility at the distal end.

[0013] Furthermore, the length direction is the same as the length direction of the venous stent.

[0014] Furthermore, the third screw is divided into a first section, a second section connected to the first section, and a third section connected to the second connecting section. The pitch of the first section is the first pitch, the pitch of the second section is the second pitch, and the pitch of the third section is the third pitch. The first pitch is less than the second pitch, and the second pitch is less than the third pitch.

[0015] Furthermore, the second screw is divided into a fourth section and a fifth section connected to the fourth section. The pitch of the fourth section is the first pitch, and the pitch of the fifth section is the second pitch.

[0016] Furthermore, the pitch of the first screw is the first pitch.

[0017] Furthermore, the first screw has 6 parts, the second screw has 3 parts, and the third screw has 3 parts.

[0018] Furthermore, the number of the first annular portion, the second annular portion, and the third annular portion is greater than or equal to 5.

[0019] Furthermore, multiple first circular portions are closer to the proximal end of the venous stent, and multiple third circular portions are closer to the distal end of the venous stent.

[0020] Furthermore, the plurality of first ring portions are first anchoring ring portions and first supporting ring portions, the plurality of second ring portions are second anchoring ring portions and second supporting ring portions, and the plurality of third ring portions are third anchoring ring portions and third supporting ring portions; the inner diameters of the first anchoring ring portions, first supporting ring portions, second anchoring ring portions, second supporting ring portions, third anchoring ring portions and third supporting ring portions are equal, the outer diameters of the first anchoring ring portions, second anchoring ring portions and third anchoring ring portions are equal, the outer diameters of the first supporting ring portions, second supporting ring portions and third supporting ring portions are equal, and the outer diameter of the first anchoring ring portion is larger than the outer diameter of the first supporting ring portion; the proximal and distal ends of the first anchoring ring portions, second anchoring ring portions and third anchoring ring portions all have chamfers, and the first anchoring ring portions, second anchoring ring portions and third anchoring ring portions all have a plurality of annularly evenly spaced groove portions.

[0021] Furthermore, the first anchoring ring portion, the second anchoring ring portion, and the third anchoring ring portion each have 4-6 groove portions distributed in a ring at equal intervals, thereby forming an anchoring protrusion between two adjacent groove portions.

[0022] Furthermore, the first anchoring ring portion, the second anchoring ring portion, and the third anchoring ring portion each have 6 groove portions and 6 anchoring protrusion portions.

[0023] Furthermore, the anchoring protrusion has a pointed portion that embeds into the inner wall of the blood vessel.

[0024] The anchoring protrusions on the anchoring ring act like barbs, achieving better anchoring with blood vessels.

[0025] Furthermore, the angle of the pointed corner is 90 degrees.

[0026] Furthermore, the pointed corner is formed by the contact between a proximal chamfer and a distal chamfer.

[0027] That is, chamfering creates a bevel, and the two bevels formed by two chamfers connect with each other to form a sharp corner.

[0028] Furthermore, there are 2-3 first anchoring ring portions, and the first anchoring ring portions are closer to the proximal end of the venous stent than the first supporting ring portions.

[0029] Furthermore, the first anchoring ring portion has three parts.

[0030] Furthermore, the second anchoring ring portion has one unit, and the second anchoring ring portion is closer to the distal end of the venous stent than the second supporting ring portion.

[0031] Furthermore, the third anchoring ring portion is one in number, and the third anchoring ring portion is closer to the distal end of the venous stent than the third supporting ring portion.

[0032] Furthermore, the multiple connecting rods are divided into a first connecting rod connected between two first ring portions, a second connecting rod connected between two second ring portions, and a third connecting rod connected between two third ring portions.

[0033] Furthermore, the number of the first connecting rods is greater than the number of the second connecting rods, and the number of the second connecting rods is greater than the number of the third connecting rods.

[0034] This results in greater strength along the length of the proximal end and greater flexibility at the distal end.

[0035] Furthermore, the multiple first connecting rods are distributed in a ring with equal spacing.

[0036] Furthermore, multiple second connecting rods are distributed in a ring at equal intervals.

[0037] Furthermore, multiple third connecting rods are distributed in a ring with equal spacing.

[0038] Furthermore, the number of first connecting rods is twice the number of second connecting rods, and the number of second connecting rods is twice the number of third connecting rods.

[0039] Furthermore, the number of the first connecting rods is between 8 and 12.

[0040] Furthermore, the number of the first connecting rods is 12.

[0041] Furthermore, the number of second connecting rods is between 4 and 6.

[0042] Furthermore, the number of second connecting rods is 6.

[0043] Furthermore, the number of third connecting rods is between 2 and 3.

[0044] Furthermore, the number of third connecting rods is three.

[0045] Beneficial effects:

[0046] 1. The venous stent of this application uses a spiral rod to guide blood to rotate and flow along the vessel wall, simulating the natural spiral flow pattern of a healthy vein.

[0047] 2. The venous stent of this application has better support at the proximal end and better flexibility at the distal end.

[0048] 3. The venous stent of this application has a first anchoring ring portion, a second anchoring ring portion and a third anchoring ring portion, thereby achieving better anchoring with the inner wall of the blood vessel, so that the venous stent will not be displaced after installation.

[0049] 4. The venous stent of this application is more convenient to produce. By adjusting the number and layout of the spiral rod, anchoring ring, connecting ring, and connecting rod, different batches of venous stents with different radial support characteristics and flexibility can be produced. Attached Figure Description

[0050] Figure 1 This is a first-person view diagram of a venous stent.

[0051] Figure 2 This is a magnified view of region A;

[0052] Figure 3 This is a magnified view of region B.

[0053] Figure 4 This is a magnified view of region C;

[0054] Figure 5 This is a schematic diagram of a venous stent from a second perspective.

[0055] Figure 6 This is a magnified view of region D;

[0056] Figure 7 This is a magnified view of region E.

[0057] Figure 8 This is a third-view diagram of a venous stent.

[0058] Figure 9 This is a magnified view of region F;

[0059] Figure 10 This is a magnified view of region G;

[0060] Figure 11 This is a magnified view of region H;

[0061] Figure 12 This is a fourth-view diagram of a venous stent.

[0062] Figure 13 This is a magnified view of region I;

[0063] Figure 14 This is a magnified view of region J.

[0064] Figure 15 This is a magnified view of region K.

[0065] Explanation of reference numerals in the attached drawings: First helical rod 1; Second helical rod 2; Third helical rod 3; First ring portion 4; First anchoring ring portion 4.1; First supporting ring portion 4.2; Second ring portion 5; Second anchoring ring portion 5.1; Second supporting ring portion 5.2; Third ring portion 6; Third anchoring ring portion 6.1; Third supporting ring portion 6.2; First connecting rod 7; Second connecting rod 8; Third connecting rod 9. Detailed Implementation

[0066] 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.

[0067] This invention provides a venous stent based on a spiral structure, as shown in the figure, comprising multiple spiral rods, multiple annular portions, and multiple connecting rods. The spiral rods have the same spiral direction and are distributed in a ring at equal intervals. The annular portions surround and are fixedly connected to the spiral rods, and the connecting rods are used to connect adjacent annular portions. The multiple spiral rods are divided into multiple first spiral rods 1, multiple second spiral rods 2, and multiple third spiral rods 3. The length of the first spiral rod 1 is less than the length of the second spiral rod 2, and the length of the second spiral rod 2 is less than the length of the third spiral rod 3. The multiple annular portions are multiple first annular portions 4, multiple second annular portions 5, and multiple third annular portions 6. The multiple first annular portions 4 are distributed at equal intervals along the length direction of the venous stent, the multiple second annular portions 5 are distributed at equal intervals along the length direction of the venous stent, and the multiple third annular portions 6 are distributed at equal intervals along the length direction of the venous stent. The spacing between adjacent first annular portions 4 is less than that between adjacent second annular portions 6. The spacing between adjacent second ring portions 5 is smaller than the spacing between adjacent third ring portions 6. Each first ring portion 4 surrounds all first spiral rods 1, all second spiral rods 2, and all third spiral rods 3 and is fixedly connected to them. Each second ring portion 5 surrounds all second spiral rods 2 and all third spiral rods 3 and is fixedly connected to them. Each third ring portion 6 surrounds all third spiral rods 3 and is fixedly connected to them. There are 6 first spiral rods 1, 3 second spiral rods 2, and 3 third spiral rods 3; the number of first ring portions 4, second ring portions 5, and third ring portions 6 are all greater than or equal to 5. Multiple first annular portions 4 are closer to the proximal end of the venous stent, and multiple third annular portions 6 are closer to the distal end of the venous stent; the multiple first annular portions 4 are divided into a first anchoring annular portion 4.1 and a first supporting annular portion 4.2, the multiple second annular portions 5 are divided into a second anchoring annular portion 5.1 and a second supporting annular portion 5.2, and the multiple third annular portions 6 are divided into a third anchoring annular portion 6.1 and a third supporting annular portion 6.2; the inner diameters of the first anchoring annular portion 4.1, the first supporting annular portion 4.2, the second anchoring annular portion 5.1, the second supporting annular portion 5.2, the third anchoring annular portion 6.1, and the third supporting annular portion 6.2 are equal. The outer diameters of the anchoring ring portion 4.1, the second anchoring ring portion 5.1, and the third anchoring ring portion 6.1 are equal, as are the outer diameters of the first supporting ring portion 4.2, the second supporting ring portion 5.2, and the third supporting ring portion 6.2. The outer diameter of the first anchoring ring portion 4.1 is larger than that of the first supporting ring portion 4.2. The proximal and distal ends of the first anchoring ring portion 4.1, the second anchoring ring portion 5.1, and the third anchoring ring portion 6.1 are all chamfered, and each of them has multiple grooves that are evenly spaced in a ring shape.The first anchoring ring portion 4.1, the second anchoring ring portion 5.1, and the third anchoring ring portion 6.1 each have six equally spaced groove portions arranged in a ring, thereby forming an anchoring protrusion between two adjacent groove portions; the anchoring protrusion has a pointed corner portion that is embedded in the inner wall of the blood vessel; the angle of the pointed corner portion is 90 degrees.

[0068] There are three first anchoring ring portions 4.1, and each first anchoring ring portion 4.1 is closer to the proximal end of the venous stent than the first supporting ring portion 4.2; there is one second anchoring ring portion 5.1, and each second anchoring ring portion 5.1 is closer to the distal end of the venous stent than the second supporting ring portion 5.2; there is one third anchoring ring portion 6.1, and each third anchoring ring portion 6.1 is closer to the distal end of the venous stent than the third supporting ring portion 6.2. Multiple connecting rods are divided into first connecting rods 7 connecting between two first ring portions 4, second connecting rods 8 connecting between two second ring portions 5, and third connecting rods 9 connecting between two third ring portions 6. The number of first connecting rods 7 is greater than the number of second connecting rods 8, and the number of second connecting rods 8 is greater than the number of third connecting rods 9. The multiple first connecting rods 7 are distributed in a ring with equal spacing; the multiple second connecting rods 8 are distributed in a ring with equal spacing; and the multiple third connecting rods 9 are distributed in a ring with equal spacing. The number of first connecting rods 7 is 12; the number of second connecting rods 8 is 6; and the number of third connecting rods 9 is 3.

[0069] Working Principle: The venous stent of this application has multiple helical rods, which guide blood to flow in a rotating manner along the vessel wall, mimicking the natural spiral flow pattern of a healthy vein. From the perspective of radial support and flexibility, the venous stent of this application is actually divided into three segments: a proximal segment closer to the heart, a distal segment further from the heart, and a transition segment connecting the proximal and distal segments. Furthermore, the proximal segment has multiple first anchoring rings, the transition segment has second anchoring rings, and the distal segment has third anchoring rings. The anchoring protrusions of the anchoring rings can embed into the inner wall of the vessel, thus providing a barb-like effect and improving the overall anchoring effect of the venous stent. Furthermore, since the annular portion is located on the outside of the helical rod, the anchoring annular portion is actually embedded in the inner wall of the blood vessel, and the connecting annular portion is close to the inner wall of the blood vessel (the outer diameter of the anchoring annular portion is larger than the outer diameter of the connecting annular portion, so the anchoring protrusion of the anchoring annular portion acts like a barb, achieving better anchoring with the blood vessel). As a result, the helical rod and the inner wall of the blood vessel are at a more suitable distance, making it easier for blood to be affected by the helical rod, forming a rotating flow, which is more conducive to blood flow.

[0070] The proximal segment, with its more helical rods (comprising a first, second, and third helical rod), denser first annular portion, and more first connecting rods, exhibits better radial support characteristics and greater strength along its length. The distal segment, with fewer helical rods (only a third helical rod), a sparser third annular portion, and sparser third connecting rods, offers better flexibility, meeting the requirements for venous stents used in the iliac vein.

[0071] Furthermore, since the individual first, second, and third anchoring rings are identical, and the individual first, second, and third connecting rings are also identical, the radial support strength and flexibility of the venous stent from the proximal to the distal end can be rationally adjusted by selecting the number of first, second, and third helical rods. This makes production more convenient. By adjusting the number and layout of the helical rods, anchoring rings, connecting rings, and connecting rods, different batches of venous stents with different radial support characteristics and flexibility can be produced to meet the needs of different lesions.

[0072] 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 based on a spiral structure, characterized in that, The stent comprises multiple spiral rods with the same spiral direction and evenly spaced in a ring, multiple annular portions surrounding and fixedly connected to the spiral rods, and multiple connecting rods for connecting adjacent annular portions. The spiral rods are divided into multiple first spiral rods, multiple second spiral rods with a length greater than the first spiral rods, and multiple third spiral rods with a length greater than the second spiral rods. The annular portions are multiple first annular portions, multiple second annular portions, and multiple third annular portions. All the first, second, and third annular portions are evenly spaced along the length of the venous stent. The spacing between adjacent first annular portions, adjacent second annular portions, and adjacent third annular portions increases sequentially. Each first annular portion surrounds and is fixedly connected to all the first, second, and third spiral rods. Each second annular portion surrounds and is fixedly connected to all the second and third spiral rods. Each third annular portion surrounds and is fixedly connected to all the third spiral rods. It is fixedly connected to all the third helical rods; multiple first ring parts are first anchoring ring parts and first supporting ring parts, multiple second ring parts are second anchoring ring parts and second supporting ring parts, and multiple third ring parts are third anchoring ring parts and third supporting ring parts; the inner diameters of the first anchoring ring parts, first supporting ring parts, second anchoring ring parts, second supporting ring parts, third anchoring ring parts and third supporting ring parts are equal, the outer diameters of the first, second and third anchoring ring parts are equal, the outer diameters of the first, second and third supporting ring parts are equal, and the outer diameter of the first anchoring ring part is larger than the outer diameter of the first supporting ring part; the proximal and distal ends of the first, second and third anchoring ring parts are all chamfered, and the first, second and third anchoring ring parts are all equipped with multiple annularly evenly spaced grooves; multiple connecting rods are divided into first connecting rods connecting between two first ring parts, second connecting rods connecting between two second ring parts, and third connecting rods connecting between two third ring parts.

2. The venous stent based on a spiral structure according to claim 1, characterized in that, The first spiral rod has 6 parts, the second spiral rod has 3 parts, and the third spiral rod has 3 parts; the number of the first annular part, the second annular part, and the third annular part is greater than or equal to 5.

3. The venous stent based on a spiral structure according to claim 1, characterized in that, The first anchoring ring portion, the second anchoring ring portion, and the third anchoring ring portion each have 4-6 groove portions distributed in a ring at equal intervals, thereby forming an anchoring protrusion between two adjacent groove portions; the anchoring protrusion has a pointed corner portion that is embedded in the inner wall of the blood vessel; the angle of the pointed corner portion is 90 degrees.

4. The venous stent based on a spiral structure according to claim 1, characterized in that, The first anchoring ring portion has 2-3 parts, and the first anchoring ring portion is closer to the proximal end of the venous stent than the first supporting ring portion; the second anchoring ring portion has 1 part, and the second anchoring ring portion is closer to the distal end of the venous stent than the second supporting ring portion; the third anchoring ring portion has 1 part, and the third anchoring ring portion is closer to the distal end of the venous stent than the third supporting ring portion.

5. The venous stent based on a spiral structure according to claim 1, characterized in that, The number of the first connecting rods is greater than the number of the second connecting rods, and the number of the second connecting rods is greater than the number of the third connecting rods.

6. The venous stent based on a spiral structure according to claim 1, characterized in that, Multiple first connecting rods are distributed in a ring with equal spacing; multiple second connecting rods are distributed in a ring with equal spacing; multiple third connecting rods are distributed in a ring with equal spacing.

7. The venous stent based on a spiral structure according to claim 1, characterized in that, The number of the first connecting rod is between 8 and 12; the number of the second connecting rod is between 4 and 6; and the number of the third connecting rod is between 2 and 3.

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