Vein stent based on spiral structure

Abstract

The venous stent based on the spiral structure comprises a plurality of spiral rods, a plurality of circular ring parts and a plurality of connecting rods, and the multiple spiral rods are annularly distributed at equal intervals in the same spiral direction; the circular ring parts surround the screw rod and are fixedly connected with the screw rod, and the connecting rods are used for connecting the adjacent circular ring parts. According to the vein stent, the spiral rod guides blood to rotate and flow along the blood vessel wall, and the natural spiral flow state of healthy veins is simulated. The proximal end has better supporting performance, and the distal end has better flexibility. The first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part are arranged, so that better anchoring with the inner wall of the blood vessel is realized, and the intravenous stent does not displace after being mounted.

Description

Technical Field

[0001] The present invention relates to the technical field of venous stents, and more particularly to a venous stent based on a spiral structure. Background Art

[0002] A venous stent is a tiny, mesh-like metal tubular structure implanted inside a human vein to support a vein that has become narrowed, blocked, or compressed due to disease, restoring patency and normal blood flow. An iliac vein stent is typically installed in the left common iliac vein, which forms an inverted Y-shape with the left and right common iliac veins and the inferior vena cava.

[0003] A venous stent installed in the left common iliac vein requires good support at the proximal end, otherwise it may cause stent deformation and restenosis of the vein. It also requires good flexibility at the distal end, otherwise it may cause phlebitis, thrombosis, or stent fracture. Furthermore, the position of the stent cannot shift after installation, so some venous stents are equipped with additional barbs. However, these points are sometimes not well balanced and are more difficult to prepare. Furthermore, the installation of the venous stent affects the original blood flow, which can lead to thrombosis within the stent. Summary of the Invention

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

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a venous stent, comprising multiple spiral rods, multiple circular ring parts and multiple connecting rods, wherein the multiple spiral rods have the same thread direction and are distributed in a circular shape with equal spacing; the circular ring parts surround the spiral rods and are fixedly connected to the spiral rods, and the connecting rods are used to connect adjacent circular ring parts.

[0006] Furthermore, the spiral rod and the annular portion are fixed by laser welding.

[0007] Furthermore, the connecting rod and the annular portion are fixed by laser welding.

[0008] Furthermore, the multiple spiral rods are divided into multiple first spiral rods, multiple second spiral rods and multiple third spiral rods, the length of the first spiral rod is smaller than the length of the second spiral rod, and the length of the second spiral rod is smaller than the length of the third spiral rod; the multiple circular parts are multiple first circular parts, multiple second circular parts and multiple third circular parts, each first circular part surrounds all the first spiral rods, all the second spiral rods and all the third spiral rods and is fixedly connected to all the first spiral rods, all the second spiral rods and all the third spiral rods, each second circular part surrounds all the second spiral rods and all the third spiral rods and is fixedly connected to all the second spiral rods and all the third spiral rods, and each third circular part surrounds all the third spiral rods and is fixedly connected to all the third spiral rods.

[0009] Thus, multiple spiral rods guide blood to flow in a rotational pattern along the blood vessel wall, simulating the natural spiral flow pattern of healthy veins.

[0010] Furthermore, the plurality of first annular portions are distributed at equal intervals along the length direction of the venous stent, the plurality of second annular portions are distributed at equal intervals along the length direction of the venous stent, and the plurality of third annular portions are distributed at equal intervals along the length direction 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] Therefore, the proximal end of the venous stent has better support and the distal end has better flexibility.

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

[0014] Furthermore, the third spiral rod 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 smaller than the second pitch, and the second pitch is smaller than the third pitch.

[0015] Furthermore, the second spiral rod 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 rod is a first pitch.

[0017] Furthermore, the number of the first spiral rods is 6, the number of the second spiral rods is 3, and the number of the third spiral rods is 3.

[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, the plurality of first annular portions are closer to the proximal end of the venous stent, and the plurality of third annular portions are closer to the distal end of the venous stent.

[0020] Furthermore, multiple first circular ring parts are first anchoring circular ring parts and first supporting circular ring parts, multiple second circular ring parts are second anchoring circular ring parts and second supporting circular ring parts, and multiple third circular ring parts are third anchoring circular ring parts and third supporting circular ring parts; the inner diameters of the first anchoring circular ring part, the first supporting circular ring part, the second anchoring circular ring part, the second supporting circular ring part, the third anchoring circular ring part and the third supporting circular ring part are equal, the outer diameters of the first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part are equal, the outer diameters of the first supporting circular ring part, the second supporting circular ring part and the third supporting circular ring part are equal, and the outer diameter of the first anchoring circular ring part is larger than the outer diameter of the first supporting circular ring part; the proximal ends and distal ends of the first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part all have chamfers, and the first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part all have multiple groove parts distributed in a ring shape with equal intervals.

[0021] Furthermore, each of the first anchoring circular ring portion, the second anchoring circular ring portion and the third anchoring circular ring portion has 4-6 groove portions distributed in a circular shape with equal intervals, so that an anchoring protrusion is formed between two adjacent groove portions.

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

[0023] Furthermore, the anchoring protrusion has a sharp corner portion embedded in the inner wall of the blood vessel.

[0024] Thus, the anchoring protrusion of the anchoring ring portion plays a role similar to a barb, thereby achieving better anchoring with the blood vessel.

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

[0026] Furthermore, the pointed corner portion is formed by the proximal end chamfer and the distal end chamfer contacting each other.

[0027] That is, the chamfer forms an inclined surface, and the two inclined surfaces formed by the two chamfers are connected to each other to form a sharp corner.

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

[0029] Furthermore, there are three first anchoring circular ring parts.

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

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

[0032] Furthermore, the plurality of connecting rods are divided into a first connecting rod connected between the two first annular portions, a second connecting rod connected between the two second annular portions, and a third connecting rod connected between the two third annular 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] As a result, the proximal end is stronger in the length direction and the distal end is more flexible.

[0035] Furthermore, the plurality of first connecting rods are distributed in a ring-like shape with equal intervals.

[0036] Furthermore, the plurality of second connecting rods are distributed in a ring-like shape with equal intervals.

[0037] Furthermore, the plurality of third connecting rods are distributed in a ring shape with equal intervals.

[0038] Furthermore, the number of the first connecting rods is equal to twice the number of the second connecting rods, and the number of the second connecting rods is equal to twice the number of the 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 the second connecting rods is between 4 and 6.

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

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

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

[0045] Beneficial effects:

[0046] 1. The venous stent of the present application has a spiral rod that guides blood to flow in a rotational manner along the blood vessel wall, simulating the natural spiral flow of a healthy vein.

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

[0048] 3. The venous stent of the present 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 the present application is more convenient to produce. By adjusting the number and layout of the spiral rod, anchoring ring portion, connecting ring portion and connecting rod, different batches of venous stents with different radial support characteristics and flexibility can be produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a first-person perspective diagram of the venous stent;

[0051] Figure 2 This is an enlarged view of area A;

[0052] Figure 3 This is an enlarged view of area B;

[0053] Figure 4 This is an enlarged view of area C;

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

[0055] Figure 6 This is an enlarged view of area D;

[0056] Figure 7 This is an enlarged view of area E;

[0057] Figure 8 This is a third-view schematic diagram of the venous stent;

[0058] Figure 9 This is an enlarged view of area F;

[0059] Figure 10 This is an enlarged view of area G;

[0060] Figure 11 This is an enlarged view of the H region;

[0061] Figure 12 This is a schematic diagram of the venous stent from the fourth perspective;

[0062] Figure 13 This is an enlarged view of area I;

[0063] Figure 14 This is an enlarged view of the J region;

[0064] Figure 15 This is an enlarged view of the K area.

[0065] Explanation of the accompanying drawings: first spiral rod 1; second spiral rod 2; third spiral rod 3; first circular portion 4; first anchoring circular portion 4.1; first supporting circular portion 4.2; second circular portion 5; second anchoring circular portion 5.1; second supporting circular portion 5.2; third circular portion 6; third anchoring circular portion 6.1; third supporting circular portion 6.2; first connecting rod 7; second connecting rod 8; third connecting rod 9. DETAILED DESCRIPTION

[0066] 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.

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

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

[0069] Working principle: The venous stent of the present application has multiple spiral rods, so that the multiple spiral rods guide the blood to flow in a rotational manner along the blood vessel wall, simulating the natural spiral flow state of a healthy vein. From the perspective of radial support and flexibility, the venous stent of the present application is actually divided into three sections, namely the proximal section close to the heart, the distal section away from the heart, and the transition section connecting the proximal section and the distal section. In addition, the proximal section has multiple first anchoring circular rings, the transition section has a second anchoring circular ring, and the distal section has a third anchoring circular ring, so that the anchoring protrusions of the anchoring circular ring can be embedded in the inner wall of the blood vessel, thereby playing a role similar to a barb, thereby making the overall anchoring effect of the venous stent better. In addition, since the circular ring portion is located on the outside of the spiral rod, the anchoring circular ring portion is actually embedded in the inner wall of the blood vessel, and the connecting circular ring portion is close to the inner wall of the blood vessel (the outer diameter of the anchoring circular ring portion is larger than the outer diameter of the connecting circular ring portion, so that the anchoring protrusion of the anchoring circular ring portion plays a role similar to a barb, achieving better anchoring with the blood vessel), so that the spiral rod and the inner wall of the blood vessel are at a more appropriate distance, so that the blood is more easily affected by the spiral rod, forming a rotating flow, which is more conducive to the flow of blood.

[0070] The proximal segment, with its greater number of helical rods (including the first, second, and third helical rods), denser first annular sections, and more first connecting rods, offers improved radial support and greater longitudinal strength. The distal segment, with its fewer helical rods (only the third helical rod), more sparsely spaced third annular sections, and even more sparsely spaced third connecting rods, offers greater flexibility, meeting the requirements for intravenous stents used in the iliac vein.

[0071] Furthermore, because the first, second, and third anchoring ring portions are identical, and the first, second, and third connecting ring portions are identical, the radial support strength and flexibility of the venous stent from the proximal end to the distal end can be adjusted by selecting the number of first, second, and third spiral rods, thereby facilitating production. By adjusting the number and layout of the spiral rods, anchoring ring portions, connecting ring portions, and connecting rods, different batches of venous stents with varying 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 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 based on a spiral structure, characterized in that: It includes multiple spiral rods, multiple annular parts and multiple connecting rods. The multiple spiral rods have the same thread direction and are distributed in a ring with equal spacing. The annular parts surround the spiral rods and are fixedly connected to the spiral rods. The connecting rods are used to connect adjacent annular parts.

2. The helical structure-based venous stent according to claim 1, characterized in that: The multiple spiral rods are divided into multiple first spiral rods, multiple second spiral rods and multiple third spiral rods, the length of the first spiral rod is smaller than the length of the second spiral rod, and the length of the second spiral rod is smaller than the length of the third spiral rod; the multiple circular parts are divided into multiple first circular parts, multiple second circular parts and multiple third circular parts, the multiple first circular parts are evenly spaced along the length direction of the venous stent, the multiple second circular parts are evenly spaced along the length direction of the venous stent, the multiple third circular parts are evenly spaced along the length direction of the venous stent, the spacing between adjacent first circular parts is smaller than the spacing between adjacent second circular parts, the spacing between adjacent second circular parts is smaller than the spacing between adjacent third circular parts, each first circular part surrounds all the first spiral rods, all the second spiral rods and all the third spiral rods and is fixedly connected to all the first spiral rods, all the second spiral rods and all the third spiral rods, each second circular part surrounds all the second spiral rods and all the third spiral rods and is fixedly connected to all the second spiral rods and all the third spiral rods, and each third circular part surrounds all the third spiral rods and is fixedly connected to all the third spiral rods.

3. The helical structure-based venous stent according to claim 1, characterized in that: There are 6 first spiral rods, 3 second spiral rods, and 3 third spiral rods; the number of the first circular portion, the second circular portion, and the third circular portion are all greater than or equal to 5.

4. The helical structure-based venous stent according to claim 2, characterized in that: The plurality of first circular ring parts are the first anchoring circular ring part and the first supporting circular ring part, the plurality of second circular ring parts are the second anchoring circular ring part and the second supporting circular ring part, and the plurality of third circular ring parts are the third anchoring circular ring part and the third supporting circular ring part; the inner diameters of the first anchoring circular ring part, the first supporting circular ring part, the second anchoring circular ring part, the second supporting circular ring part, the third anchoring circular ring part and the third supporting circular ring part are equal, the outer diameters of the first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part are equal, the outer diameters of the first supporting circular ring part, the second supporting circular ring part and the third supporting circular ring part are equal, and the outer diameter of the first anchoring circular ring part is larger than the outer diameter of the first supporting circular ring part; the proximal ends and distal ends of the first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part all have chamfers, and the first anchoring circular ring part, the second anchoring circular ring part and the third anchoring circular ring part all have multiple groove parts distributed in a ring shape with equal spacing.

5. The helical structure-based venous stent according to claim 4, characterized in that: The first anchoring circular ring portion, the second anchoring circular ring portion and the third anchoring circular ring portion all have 4-6 groove portions distributed in a circular shape with equal intervals, so that an anchoring protrusion is formed between two adjacent groove portions; the anchoring protrusion has a sharp corner portion embedded in the inner wall of the blood vessel; the angle of the sharp corner portion is 90 degrees.

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

7. The helical structure-based venous stent according to claim 2, characterized in that: The plurality of connecting rods are divided into a first connecting rod connected between the two first annular portions, a second connecting rod connected between the two second annular portions, and a third connecting rod connected between the two third annular portions.

8. The helical structure-based venous stent according to claim 7, 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.

9. The helical structure-based venous stent according to claim 7, characterized in that: The plurality of first connecting rods are distributed in a circular shape with equal intervals; the plurality of second connecting rods are distributed in a circular shape with equal intervals; and the plurality of third connecting rods are distributed in a circular shape with equal intervals.

10. The helical structure-based venous stent according to claim 7, characterized in that: The number of the first connecting rods is between 8 and 12; the number of the second connecting rods is between 4 and 6; and the number of the third connecting rods is between 2 and 3.

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