Vein stent

Abstract

The invention discloses a vein stent which comprises a first stent unit and a second stent unit, the first stent unit comprises a first stent body, a plurality of first end units and a plurality of second end units, and the first stent body comprises a plurality of screw rods; the second support unit comprises a second support body, a plurality of third end units and a plurality of fourth end units. According to the venous stent, the two stent units are combined, so that when the venous stent is used, choices are richer. The two stent units are matched, so that one end has better radial supporting characteristic, the other end has better flexibility, the spiral rod can enable blood to rotate, flowing of blood in a blood vessel after the stent is installed is more facilitated, the spiral stent guides the blood flow to advance along a spiral path, and the blood flow is more uniform. According to the invention, disordered blood flow can be effectively converted into more ordered laminar rotating blood flow, so that the generation of turbulent flow is reduced, and the probability of thrombus formation is reduced.

Description

Technical Field

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

[0002] Venous stents are medical devices used to treat venous stenosis or obstruction. They are primarily used to restore venous blood flow, improve symptoms such as lower limb swelling and pain caused by venous stenosis, and reduce the risk of serious complications such as pulmonary embolism caused by thrombus dislodgement. Venous stents are suitable for conditions such as iliac vein compression syndrome, deep vein thrombosis, and post-thrombotic syndrome.

[0003] The treatment of venous diseases has always been complicated, and the degree of lesions in the blood vessels is also relatively complex. Especially for diseases in special areas such as the iliac vein, the treatment process is even more difficult. When performing interventional treatment, it is often necessary to make some temporary treatments based on the specific conditions of the lesion. For example, it is necessary to determine whether to add a stent to better cover the lesion area based on the length of the lesion. Although the combination of multiple stents can achieve effective coverage of lesions in longer areas, when multiple stents work together, they need to be properly coordinated to form a whole that can achieve ideal support and flexibility in different positions. Moreover, after the stent is successfully installed, it is necessary to ensure that the position of the stent cannot be displaced, which requires the stent to have good anchoring properties. Summary of the Invention

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

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: A venous stent comprises a first stent unit and a second stent unit, the first stent unit comprising a first stent body, a plurality of first end units connected to the proximal end of the first stent body, and a plurality of second end units connected to the distal end of the first stent body, the first stent body comprising a plurality of spiral rods, two adjacent spiral rods being connected to a first end unit and a second end unit, the first end unit comprising two first connecting rods fixedly connected to the ends of the spiral rods and an inverted V-shaped rod with rounded corners connecting the two first connecting rods, the second end unit comprising two second connecting rods fixedly connected to the ends of the spiral rods and a V-shaped rod with rounded corners connecting the two second connecting rods; the second stent unit comprises a second stent body, a plurality of third end units fixedly connected to the proximal end of the second stent body, and a plurality of fourth end units fixedly connected to the distal end of the second stent body, the third end unit comprising a first elastic rod, a third connecting rod fixedly connected to the first elastic rod, and a first annular portion fixedly connected to the third connecting rod, the fourth end unit comprising an extension rod, a second elastic rod fixedly connected to the extension rod, a fourth connecting rod fixedly connected to the second elastic rod, and a second annular portion fixedly connected to the fourth connecting rod.

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

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

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

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

[0010] Furthermore, each third connecting rod abuts against an inner side of a corresponding V-shaped rod.

[0011] Thus, the dimensions of the third connecting rod and the first annular portion match. Under the action of the first elastic rod, the third connecting rod compresses the V-shaped rod, thereby better matching the barbs on the V-shaped rod with the inner wall of the blood vessel. Furthermore, under the action of the first elastic rod, the first annular portion can better enable the first curved abutting rod to abut the blood vessel. Similarly, under the action of the second elastic rod, the second annular portion can better enable the second curved abutting rod to abut the blood vessel.

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

[0013] Therefore, the first elastic rod and the second elastic rod have a certain elasticity due to their arc shape, and have the effect of expanding outwards.

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

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

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

[0017] Therefore, the proximal end of the first stent unit has better radial support and the distal end has better flexibility.

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

[0019] Therefore, during the implantation process, better visualization and positioning of the first bracket unit can be achieved.

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

[0021] Therefore, during the implantation process, better visualization and positioning of the second bracket unit can be achieved.

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

[0023] Furthermore, the second bracket body includes a plurality of first straight rods distributed in a circular shape with equal intervals, a plurality of second straight rods distributed in a circular shape with equal intervals, a plurality of inverted V-shaped first connecting frames and a plurality of V-shaped second connecting frames, and the number of the first straight rods, the second straight rods, the first connecting frames and the second connecting frames are equal.

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

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

[0026] Furthermore, a plurality of fifth connecting rods are connected between two adjacent first straight rods, and a plurality of sixth connecting rods are connected between two adjacent second straight rods.

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

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

[0029] Furthermore, the shape of the fifth connecting rod is a portion of a helical line.

[0030] Furthermore, the shape of the sixth connecting rod is a portion of a helical line.

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

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

[0033] Beneficial effects:

[0034] 1. The venous stent of the present application is a combination of two stent units, which provides more choices when using the venous stent. Even during clinical treatment, it can be selected whether to install the second stent unit as needed.

[0035] 2. The venous stent of the present application has two stent units that cooperate so that one end has better radial support characteristics and the other end has better flexibility, and the spiral spiral rod can make the blood rotate, which is more conducive to the flow of blood in the blood vessel after the stent is installed. The spiral stent can effectively convert the disordered blood flow into a more orderly, laminar rotating blood flow by guiding the blood flow along the spiral path, thereby reducing the generation of turbulence and reducing the chance of thrombosis.

[0036] 3. The venous stent of the present application, when the two stent units are used together, can limit and lock each other, so that the two stent units can act as a whole and have better matching stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a first-person perspective diagram of the venous stent;

[0038] Figure 2 This is an enlarged view of area A;

[0039] Figure 3 This is an enlarged view of area B;

[0040] Figure 4 This is an enlarged view of area C;

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

[0042] Figure 6 This is an enlarged view of area D;

[0043] Figure 7 This is an enlarged view of area E;

[0044] Figure 8 This is an enlarged view of area F;

[0045] Figure 9 This is an enlarged view of area G;

[0046] Figure 10 This is a schematic diagram of the separation of the first bracket unit and the second bracket unit;

[0047] Figure 11 This is an enlarged view of the H region;

[0048] Figure 12 This is an enlarged view of area I;

[0049] Figure 13 This is an enlarged view of the J region;

[0050] Figure 14 This is an enlarged view of the K area.

[0051] Explanation of the accompanying drawings: spiral rod 1; first connecting rod 2.1; first transition rod 2.2; first main rod 2.3; first curved rod 2.4; first barb 2.5; second connecting rod 3.1; second transition rod 3.2; second main rod 3.3; second curved rod 3.4; second barb 3.5; first straight rod 4.1; second straight rod 4.2; first connecting frame 4.3; second connecting frame 4.4; fifth connecting rod 4.5; sixth connecting rod 4.6; first elastic rod 5.1; third connecting rod 5.2; first annular portion 5.3; first curved abutting rod 5.4; third developing ring 5.5; extension rod 6.1; second elastic rod 6.2; fourth connecting rod 6.3; second annular portion 6.4; second curved abutting rod 6.5; fourth developing ring 6.6; connecting block 7.1; extension plate 7.2; limit block 7.3; first developing ring 8; second developing ring 9. DETAILED DESCRIPTION

[0052] 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.

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

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

[0055] The first bracket unit includes multiple first developing rings 8 and multiple second developing rings 9, each first developing ring 8 is fixedly connected to two adjacent first connecting rods 2.1, and each second developing ring 9 is fixedly connected to two adjacent second connecting rods 3.1; a third developing ring 5.5 located in the first annular portion 5.3 is fixed to each first annular portion 5.3, and a fourth developing ring 6.6 located in the second annular portion 6.4 is fixed to each second annular portion 6.4. The inverted V-shaped rod includes two first transition rods 2.2, two first main rods 2.3 and a first curved rod 2.4, the first curved rod 2.4 connects the two first main rods 2.3, and the first transition rod 2.2 connects the first connecting rod 2.1 and the first main rod 2.3; the V-shaped rod includes two second transition rods 3.2, two second main rods 3.3 and a second curved rod 3.4, the second curved rod 3.4 connects the two second main rods 3.3, and the second transition rod 3.2 connects the second connecting rod 3.1 and the second main rod 3.3; the first transition rod 2.2 and the second transition rod 3.2 are both arc-shaped.

[0056] The second bracket body includes a plurality of first straight rods 4.1 distributed in an annular manner with equal intervals, a plurality of second straight rods 4.2 distributed in an annular manner with equal intervals, a plurality of inverted V-shaped first connecting frames 4.3, and a plurality of V-shaped second connecting frames 4.4. The first straight rods 4.1, the second straight rods 4.2, the first connecting frames 4.3, and the second connecting frames 4.4 are equal in number; the first straight rods 4.1, the third end units, and the fourth end units are equal in number; the proximal end of each first straight rod 4.1 is connected to the first elastic rod 5.1, and the distal end is connected to the first connecting frame 4. 3, the proximal end of each second straight rod 4.2 is connected to the first connecting frame 4.3, and the distal end is connected to the second connecting frame 4.4. Each second connecting frame 4.4 is connected to the extension rod 6.1; each first connecting frame 4.3 is connected to one first straight rod 4.1 and two second straight rods 4.2, and each second connecting frame 4.4 is connected to one extension rod 6.1 and two second straight rods 4.2; a plurality of fifth connecting rods 4.5 are connected between two adjacent first straight rods 4.1, and a plurality of sixth connecting rods 4.6 are connected between two adjacent second straight rods 4.2. The number of each of the first straight rods 4.1, the second straight rods 4.2, the first connecting frame 4.3, and the second connecting frame 4.4 is eight. The length of the second straight rod 4.2 is greater than or equal to the length of the first straight rod 4.1, the number of the fifth connecting rods 4.5 between two adjacent first straight rods 4.1 is greater than or equal to the number of the sixth connecting rods 4.6 between two adjacent second straight rods 4.2; the shape of the fifth connecting rod 4.5 is a portion of a spiral line, and the shape of the sixth connecting rod 4.6 is a portion of a spiral line; the number of the fifth connecting rods 4.5 between two adjacent first straight rods 4.1 is four, and the number of the sixth connecting rods 4.6 between two adjacent second straight rods 4.2 is three.

[0057] Working Principle: The venous stent of the present application comprises a first stent unit and a second stent unit. The first stent unit can be used alone or together. When releasing, the first stent unit can be released first, followed by the second stent unit. The spiral rod of the first stent unit causes blood to rotate along a spiral path, effectively transforming turbulent blood flow into a more orderly, laminar, rotating blood flow, thereby reducing turbulence and lowering the risk of thrombosis. Furthermore, the first stent unit can be anchored to the first stent unit using first and second barbs. After the first stent unit is released, the second stent unit can be released. After release, the first annular portion of the second stent unit can be embedded in the V-shaped rod, forming a stoppered fit between the first annular portion and the V-shaped rod. The stopper is inserted into the first annular portion, thereby further securing the first and second stent units. Furthermore, the second stent unit can abut against the sidewall of the blood vessel via the first and second curved abutting rods, thereby anchoring the second stent unit to the vessel. Thus, the first and second stent units can be well anchored to the blood vessels, and the first and second stent units can be installed in a limited position by the V-shaped rod and the first annular portion, and the limiting block and the first annular portion. Thus, the first and second stent units can work as a whole.

[0058] In addition, the first stent unit has multiple spiral rods, and the spiral rods are relatively dense, so it has better radial support characteristics. The section of the second stent unit close to the first stent unit has relatively more fifth connecting rods, and the section away from the first stent unit has relatively fewer sixth connecting rods. Therefore, the section of the second stent unit close to the heart has better radial support than the section away from the heart, and the end of the second stent unit away from the heart has better flexibility than the section close to the heart, so as to better meet the needs of actual use in blood vessels.

[0059] 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, characterized in that: The cam is connected to the support frame of the second support frame by the spring, and the spring is connected to the support frame by the spring.

2. The venous stent according to claim 1, characterized in that: A first barb is fixed to the inverted V-shaped rod, and a second barb is fixed to the V-shaped rod; a first arc-shaped abutting rod is fixedly connected to the first annular portion, and a second arc-shaped abutting rod is fixed to the second annular portion; the number of the V-shaped rods and the first annular portion is equal and the two correspond one to one, the first annular portion is embedded in the corresponding V-shaped rod, and two limiting portions are fixed to the V-shaped rod, and the limiting portion includes a connecting block fixedly connected to the V-shaped rod, an extension plate fixedly connected to the connecting block, and a limiting block fixedly connected to the extension plate, and the limiting block is inserted into the first annular portion.

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

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

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

6. The venous stent according to claim 1, characterized in that: The first bracket unit includes multiple first developing rings and multiple second developing rings, each first developing ring is fixedly connected to two adjacent first connecting rods, and each second developing ring is fixedly connected to two adjacent second connecting rods; a third developing ring located in the first annular portion is fixed to each first annular portion, and a fourth developing ring located in the second annular portion is fixed to each second annular portion.

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

8. The venous stent according to claim 1, characterized in that: The second bracket body includes a plurality of first straight rods distributed in a circular shape with equal intervals, a plurality of second straight rods distributed in a circular shape with equal intervals, a plurality of inverted V-shaped first connecting frames and a plurality of V-shaped second connecting frames, the number of the first straight rods, the second straight rods, the first connecting frames and the second connecting frames are equal; the number of the first straight rods, the third end units and the fourth end units are equal, the proximal end of each first straight rod is connected to the first elastic rod, and the distal end is connected to the first connecting frame, the proximal end of each second straight rod is connected to the first connecting frame, and the distal end is connected to the second connecting frame, and each second connecting frame is connected to the extension rod; each first connecting frame is connected to one first straight rod and two second straight rods, and each second connecting frame is connected to one extension rod and two second straight rods; a plurality of fifth connecting rods are connected between two adjacent first straight rods, and a plurality of sixth connecting rods are connected between two adjacent second straight rods.

9. The venous stent according to claim 8, characterized in that: The number of the first straight rods, the second straight rods, the first connecting frames, and the second connecting frames are all 6-8.

10. The venous stent according to claim 8, characterized in that: The length of the second straight rod is greater than or equal to the length of the first straight rod, the number of fifth connecting rods between two adjacent first straight rods is greater than or equal to the number of sixth connecting rods between two adjacent second straight rods; the shape of the fifth connecting rod is a portion of a spiral line, and the shape of the sixth connecting rod is a portion of a spiral line; the number of fifth connecting rods between two adjacent first straight rods is 4-6, and the number of sixth connecting rods between two adjacent second straight rods is 3-5.

Images