Anti-reflux stent for veins

Abstract

The utility model relates to an anti-regurgitation stent for veins, and relates to the technical field of medical instruments, the anti-regurgitation stent comprises a supporting cylinder, a blood flow channel is formed in the supporting cylinder, a blood inlet is formed in one end of the supporting cylinder, a blood outlet is formed in the other end of the supporting cylinder, and the blood inlet and the blood outlet are both communicated with the blood channel; the supporting frame is installed in the supporting cylinder, and the supporting frame is used for supporting the supporting cylinder; the anti-regurgitation valves are installed on the side, close to the blood outlet, of the supporting cylinder, and the multiple anti-regurgitation valves are arranged around the blood outlet at intervals; and the disassembling assembly is installed in the supporting cylinder, and the disassembling assembly is used for disassembling the anti-reflux valve. The anti-regurgitation valve is opened when blood flows forwards and is closed when the blood flows backwards, the blood is not prone to blocking the anti-regurgitation valve, and the blood can normally flow in the blood vessel.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to an anti-reflux stent for veins. Background Art

[0002] Venous reflux is the fundamental cause of lower extremity venous reflux diseases. Venous blood in the human body is blood that returns to the heart. Through the action of venous valves and leg muscle pumps, the venous blood in the lower extremities returns to the heart. Due to congenital insufficiency of venous valves or long-term heavy physical labor, long-term sitting or standing, the lower extremity venous valves and lower extremity veins are long-term affected by the gravity of the iliac vein and inferior vena cava blood, causing the lower extremity veins to dilate, the bicuspid structure of the lower extremity venous valves to be damaged, the valves unable to close, resulting in blood reflux, and the lower extremity venous blood losing its normal unidirectional centripetal reflux function. The lower extremity venous blood stasis, thus further increasing the lower extremity venous pressure, entering a vicious cycle, and gradually aggravating the venous reflux. Patients will show symptoms such as lower extremity swelling and discomfort, superficial varicose veins in the lower extremities, skin pigmentation, eczema, itching. If the condition is severe, there will be local rupture and bleeding, thrombus formation or difficult-to-heal thrombus.

[0003] The existing Chinese patent with the publication number CN118203457A discloses a venous stent for preventing iliac vein reflux, which relates to the technical field of medical devices. The venous stent for preventing iliac vein reflux includes a stent body. The two ends of the stent body are respectively provided with a first drainage hole and a second drainage hole. A one-way valve is arranged inside the stent body, and the first drainage hole, the one-way valve and the second drainage hole are sequentially communicated; when the stent body is installed in the iliac vein, the second drainage hole is close to the proximal end of the iliac vein, and the blood at the distal end of the iliac vein can flow to the proximal end of the iliac vein through the first drainage hole, the one-way valve and the second drainage hole in sequence, and vice versa, it cannot flow.

[0004] In the related art, by installing a one-way valve in the venous stent, the blood at the distal end of the iliac vein can flow to the proximal end of the iliac vein through the first drainage hole, the one-way valve and the second drainage hole in sequence, and vice versa, it cannot flow.

[0005] Regarding the above related art, the inventor believes that by installing a one-way valve in the venous stent to restrict blood reflux through the one-way valve, the one-way valve reduces the inner diameter of the blood vessel. After long-term use, the one-way valve is prone to blockage, thereby affecting blood flow. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an anti-reflux stent for veins, which solves the technical problem that after long-term use, the one-way valve is prone to blockage, thereby affecting blood flow when a one-way valve is installed in the venous stent.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] An anti-reflux stent for veins, comprising:

[0009] A support cylinder, a blood flow channel is formed in the support cylinder, and a blood inlet is formed at one end of the support cylinder, and a blood outlet is formed at the other end. Both the blood inlet and the blood outlet are communicated with the blood channel;

[0010] A support frame, the support frame is installed in the support cylinder, and the support frame supports the support cylinder;

[0011] An anti-reflux valve, the anti-reflux valve is installed on one side of the support cylinder close to the blood outlet, and a plurality of anti-reflux valves are arranged at intervals around the blood outlet;

[0012] A disassembly component, the disassembly component is installed in the support cylinder, and the disassembly component is used to disassemble the anti-reflux valve.

[0013] Through the above technical solutions, the support cylinder is placed into the vein, blood enters from the blood inlet of the support cylinder, the blood flows through the blood flow channel in the support cylinder, and then flows out from the blood outlet of the support cylinder. During the use of the support cylinder, the support frame supports the support cylinder. When blood reflux occurs, the anti-reflux valve restricts the reflux of blood. After being used for a period of time, the anti-reflux valve is removed from the support cylinder through the disassembly component, and the unused anti-reflux valve is reinstalled on the support cylinder through the disassembly component. The anti-reflux valve opens when the blood flows forward and closes when the blood flows backward. Blood is not easily blocked at the anti-reflux valve, so that the blood can flow normally in the blood vessel.

[0014] Further, the disassembly component includes an installation ring, a support plate is arranged on the installation ring, a plurality of support plates are arranged at intervals around the installation ring, and a spring piece is arranged between the plurality of support plates and the installation ring. Two ends of the spring piece are respectively connected to the installation ring and the support plate, and the anti-reflux valve is connected to the support plate.

[0015] Through the above technical solutions, the support plate on the installation ring is pressed tightly in the support cylinder through the spring piece, so that the convenience of installing the anti-reflux valve in the support cylinder is improved.

[0016] Further, a limiting groove is formed between the spring piece and the installation ring; a pulling plate is arranged on the spring piece, a guiding groove is formed on the installation ring, one end of the pulling plate is connected to the spring piece, and the other end passes through the guiding groove. A hook is arranged at the end of the pulling plate passing through the guiding groove, and the hook is located inside the installation ring.

[0017] Through the above technical solution, the external device is inserted into the support cylinder, and the limiting groove limits the mounting ring to prevent the mounting ring from rotating during disassembly. Then, the hook is clamped on the external device. As the hook pulls the support plate towards the side close to the mounting ring, the elastic piece is compressed at this time. After the support plate is separated from the support cylinder, the mounting ring can be removed, greatly improving the convenience of removing the mounting ring.

[0018] Further, a guiding inclined surface is formed on the side of the hook facing the mounting ring, and the guiding inclined surface faces the side close to the mounting ring.

[0019] Through the above technical solution, the guiding inclined surface on the hook guides the external device, enabling the hook to be clamped on the external device and improving the convenience of the hook clamping.

[0020] Further, a sealing gasket is provided between several adjacent anti-reflux valves, and two adjacent sealing gaskets are in contact with each other.

[0021] Through the above technical solution, the sealing gasket increases the sealing performance between two adjacent anti-reflux valves and reduces the blood reflux.

[0022] Further, a sealing portion is formed on the side of several anti-reflux valves away from the support cylinder, and the sealing portion reduces the blood flow towards the support cylinder side.

[0023] Through the above technical solution, when blood reflux occurs, the blood flows to the sealing portion of the anti-reflux valve, and the blood abuts against the anti-reflux valve, improving the sealing performance between two adjacent anti-reflux valves.

[0024] Further, a support inclined surface is formed on the inner side of the support cylinder, and the support inclined surface supports the anti-reflux valve.

[0025] Through the above technical solution, the support inclined surface in the support cylinder supports the anti-reflux valve, which can reduce the excessive folding of the anti-reflux valve and improve the service life of the anti-reflux valve.

[0026] Further, a positioning groove is formed on the inner side of the support cylinder, the support plate is embedded in the positioning groove, and an anti-slip ring is provided on the outer side of the support cylinder, and the anti-slip ring is sleeved on the support cylinder.

[0027] Through the above technical solution, the support plate is embedded in the positioning groove of the support cylinder, improving the stability of the installation of the anti-reflux valve. When the support plate is embedded in the positioning groove, the support plate can press the anti-slip ring on the support cylinder tightly against the inner wall of the patient's blood vessel, greatly improving the stability of the support cylinder in the patient's blood vessel.

[0028] Furthermore, a scratch-proof inclined surface is formed on one side of the support cylinder close to the blood outlet, and the scratch-proof inclined surface faces away from the support cylinder.

[0029] Through the above technical solution, the scratch-proof inclined surface at one end of the support cylinder guides the support cylinder, improving the convenience of the support cylinder moving in the blood vessel.

[0030] In summary, the present application includes at least one of the following beneficial technical effects of the anti-reflux stent for veins:

[0031] 1. During use, the support cylinder is placed into the vein, blood enters from the blood inlet of the support cylinder, flows through the blood flow channel inside the support cylinder, and then flows out from the blood outlet of the support cylinder. During the use of the support cylinder, the support frame supports the support cylinder. When blood reflux occurs, the anti-reflux valve restricts the reflux of blood. After using for a period of time, the anti-reflux valve is removed from the support cylinder through the disassembly component, and an unused anti-reflux valve is reinstalled on the support cylinder through the disassembly component. The anti-reflux valve opens when blood flows forward and closes when blood flows backward. Blood is not easily blocked at the anti-reflux valve, enabling blood to flow normally in the blood vessel;

[0032] 2. Through the setting of the support plate and the positioning groove, the stability of the anti-reflux valve installed in the support cylinder can be improved;

[0033] 3. Through the setting of the sealing gasket and the sealing part, the anti-reflux effect of the anti-reflux valve on blood is improved. Description of the Drawings

[0034] Figure 1 is a schematic diagram of the overall structure of an anti-reflux stent for veins mainly provided in this embodiment;

[0035] Figure 2 is a cross-sectional view of the support cylinder structure mainly provided in this embodiment;

[0036] Figure 3 is a schematic diagram of the installation ring structure mainly provided in this embodiment;

[0037] Figure 4 is a schematic diagram of the anti-reflux valve structure mainly provided in this embodiment;

[0038] Figure 5 is a schematic diagram of the positioning tube and the rotating tube structure mainly provided in this embodiment;

[0039] Figure 6 is Figure 5 an enlarged schematic diagram of the partial A part.

[0040] Reference signs: 1, support cylinder; 11, blood inlet; 12, blood flow channel; 13, blood outlet; 14, support frame; 15, anti-slip ring; 16, anti-scratch inclined surface; 17, positioning groove; 18, support inclined surface; 2, anti-reflux valve; 21, sealing gasket; 22, sealing part; 3, disassembly component; 31, mounting ring; 311, guiding groove; 32, support plate; 33, elastic piece; 34, pulling plate; 341, hook; 342, guiding inclined surface; 35, limiting groove; 4, positioning tube; 41, rotating tube; 42, positioning column; 43, hook plate; 431, hook groove; 44, limiting plate. Detailed implementation manners

[0041] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0042] The following is further detailed description of this application in conjunction with the attached Figures 1-6 This application is further described in detail.

[0043] The embodiment of this application discloses an anti-reflux stent for veins.

[0044] Referring to Figures 1-2 , an anti-reflux stent for veins includes a support cylinder 1. During use, the support cylinder 1 is placed into the vein of the patient's lower limb. An anti-reflux valve 2 and a disassembly component 3 are provided on the support cylinder 1, and the anti-reflux valve 2 is installed on the support cylinder 1 through the disassembly component 3. During use, the anti-reflux valve 2 on the support cylinder 1 enables blood to flow from the distal end to the proximal end, and prevents it from flowing in the opposite direction.

[0045] The support cylinder 1 is integrally cylindrical. A blood flow channel 12 is formed inside the support cylinder 1, and a blood inlet 11 is formed at one end of the support cylinder 1, and a blood outlet 13 is formed at the other end. The blood inlet 11 of the support cylinder 1 faces the distal end, and the blood outlet 13 faces the proximal end. During use, blood enters from the blood inlet 11 of the support cylinder 1, flows through the blood channel inside the support cylinder 1, and finally flows out from the blood outlet 13.

[0046] Referring to Figure 2 , in order to improve the support effect of the support cylinder 1, a support frame 14 is arranged inside the support cylinder 1. The support frame 14 is cut into a net shape from nickel-titanium alloy, and the support frame 14 is closely attached to the inner side of the support cylinder 1. During use, the support frame 14 can not only improve the support effect of the support cylinder 1, but also improve the bending effect of the support cylinder 1 in the blood vessel when the support cylinder 1 needs to be bent during the process of advancing in the blood vessel.

[0047] Furthermore, since the outer surface of the support cylinder 1 is relatively smooth, during long-term use, the support cylinder 1 will not adhere to the blood vessel, enabling the support cylinder 1 to be better removed from the blood vessel.

[0048] Since the outer surface of the support cylinder 1 is relatively smooth, the support cylinder 1 is prone to displacement in the blood vessel. Therefore, an anti-slip ring 15 is provided on the support cylinder 1. The anti-slip ring 15 is integrally formed in a ring shape, and the axis of the anti-slip ring 15 is coaxial with the axis of the support cylinder 1. When the support cylinder 1 is placed in the blood vessel, the anti-slip ring 15 abuts between the blood vessel and the support cylinder 1, thereby preventing the support cylinder 1 from slipping during use.

[0049] An anti-scratch inclined surface 16 is formed at one end of the support cylinder 1 close to the blood outlet 13. Since the support cylinder 1 needs to move in the blood vessel, guiding through the anti-scratch inclined surface 16 on the support cylinder 1 can reduce the damage caused by the support cylinder 1 to the blood vessel.

[0050] Refer to Figure 4 , five anti-reflux valves 2 are evenly spaced around the axis of the support cylinder 1. Sealing gaskets 21 are integrally formed on one side of the five anti-reflux valves 2 close to each other. The sealing gaskets 21 on adjacent two anti-reflux valves 2 abut against each other, thereby improving the sealing performance between adjacent two anti-reflux valves 2.

[0051] Furthermore, a sealing portion 22 is formed at one end of the five anti-reflux valves 2 away from the blood outlet 13. When the blood flows from the blood inlet 11 to the blood outlet 13, the five anti-reflux valves 2 unfold under the impact of the blood. When the blood flows back to the side of the distal end, the anti-reflux valves 2 merge together under the impact of the blood. At this time, the sealing gaskets 21 between adjacent two anti-reflux valves 2 can improve the sealing performance between adjacent two anti-reflux valves 2.

[0052] Refer to Figure 3 , the disassembly assembly 3 includes a mounting ring 31. The axis of the mounting ring 31 is coaxial with the axis of the support cylinder 1. A support plate 32 is provided on one side of the mounting ring 31. Five support plates 32 are evenly spaced around the axis of the mounting ring 31. The cross-section of the five support plates 32 is arc-shaped, and the axis of the arc-shaped support plate 32 is coaxial with the axis of the mounting ring 31.

[0053] Elastic pieces 33 are provided between the five support plates 32 and the mounting ring 31. One end of the elastic piece 33 is connected to the mounting ring 31, and the other end is connected to the support plate 32. One end of the anti-reflux valve 2 away from the sealing portion 22 is connected to the support plate 32. During use, the elastic piece 33 abuts the support plate 32 against the support cylinder 1. Thereby enabling the anti-reflux valve 2 to be mounted on the support cylinder 1.

[0054] When blood flows through the blood flow channel 12, the impact force of the blood easily causes the position of the support plate 32 in the support cylinder 1 to shift. Therefore, a positioning groove 17 is provided in the support cylinder 1. The position of the positioning groove 17 in the axial direction of the support cylinder 1 is the same as that of the anti-slip ring 15, and the positioning groove 17 corresponds to the support plate 32. When the anti-reflux valve 2 is installed on the support cylinder 1, the support plate 32 is embedded in the positioning groove 17, thereby being able to reduce the shift of the position of the support plate 32 in the support cylinder 1.

[0055] Furthermore, since the support plate 32 is embedded in the positioning groove 17, and the elastic piece 33 between the support plate 32 and the mounting ring 31 has elasticity, the support plate 32 can push up the anti-slip ring 15 on the support cylinder 1, thereby being able to further improve the stability of the support cylinder 1 in the blood vessel.

[0056] After long-term use, the anti-reflux valve 2 is prone to losing its activity, thereby affecting the blood flow in the blood vessel. Therefore, the anti-reflux valve 2 needs to be replaceable. To improve the convenience of replacing the anti-reflux valve 2, a pull plate 34 is provided on the support plate 32, and a guide groove 311 is provided on the mounting ring 31. The cross-section of the guide groove 311 is arc-shaped, and the guide groove 311 corresponds to the support plate 32. One end of the pull plate 34 is connected to the corresponding support plate 32, and the other end passes through the guide groove 311 on the mounting ring 31. A hook 341 is provided at the end of the pull plate 34 passing through the mounting ring 31. During use, the support plate 32 is pulled towards the side close to the mounting ring 31 through the hook 341, separating the support plate 32 from the support cylinder 1, so that the mounting ring 31 and the anti-reflux valve 2 can be removed from the support cylinder 1.

[0057] Refer to Figures 5-6 To improve the convenience of removing the mounting plate from the support cylinder 1, a limiting groove 35 is formed between the elastic piece 33 and the mounting ring 31, and a guiding inclined surface 342 is formed on the side of the hook 341 close to the mounting ring 31. During use, the mounting ring 31 is removed from the support cylinder 1 through an external device. The external device includes a positioning tube 4 and a rotating tube 41. One end of the positioning tube 4 penetrates into the support cylinder 1. A positioning post 42 is provided at the end of the positioning tube 4 penetrating into the support cylinder 1. The positioning post 42 passes through the limiting groove 35 between the elastic piece 33 and the mounting ring 31, and the positioning post 42 positions the mounting ring 31. One end of the rotating tube 41 passes through the positioning post 42 and penetrates into the support cylinder 1. A hook plate 43 is provided at the end of the rotating tube 41 penetrating into the support cylinder 1. A hook groove 431 is formed between the hook plate 43 and the rotating tube 41. During use, the guiding inclined surface 342 on the hook 341 guides the hook plate 43. One end of the hook 341 is hooked in the hook groove 431 between the hook plate 43 and the rotating tube 41. When the rotating tube 41 is rotated, the hook 341 moves towards the side close to the mounting ring 31 under the action of the rotating tube 41, thereby separating the support plate 32 from the support cylinder 1.

[0058] To improve the convenience of installing and disassembling the installation ring 31 in the blood vessel, a limiting plate 44 is provided on the rotating tube 41. There are two limiting plates 44 arranged at intervals along the corresponding hook plate 43, and the two limiting plates 44 are integrally formed with the rotating tube 41. During use, the hook 341 is hooked in the hook groove 431 between the two limiting plates 44, so as to improve the stability of the rotating tube 41 driving the installation ring 31 to advance and retreat.

[0059] When blood flows from the distal end to the proximal end, the blood will impact on the anti-reflux valve 2. After long-term use, the anti-reflux valve 2 is prone to lose its activity, shortening the service life of the anti-reflux valve 2. Therefore, a support inclined surface 18 is formed on one side of the support cylinder 1 close to the blood outlet 13. When the anti-reflux valve 2 opens under the impact of blood, the support inclined surface 18 on the support cylinder 1 supports the anti-reflux valve 2, reducing the opening angle of the anti-reflux valve 2, thereby extending the service life of the anti-reflux valve 2 and prolonging the replacement time of the anti-reflux valve 2 during use.

[0060] A method for using an anti-reflux stent for veins is as follows:

[0061] Put the support cylinder 1 into the lower limb vein of the patient through the anti-scratch inclined surface 16;

[0062] Blood enters from the blood inlet 11 of the support cylinder 1, flows through the blood channel of the support cylinder 1, and flows out from the blood outlet 13;

[0063] When part of the blood flows back, the anti-reflux valve 2 closes the blood outlet 13 of the support cylinder 1;

[0064] During use, the support frame 14 and the support plate 32 support the support cylinder 1;

[0065] After using for a period of time, pull several hooks 341 towards the inside of the installation ring 31 through the positioning tube 4 and the rotating tube 41, so that the support plate 32 is separated from the support cylinder 1;

[0066] Remove the installation ring 31 together with the anti-reflux valve 2 from the support cylinder 1;

[0067] Put a new anti-reflux valve 2 into the support cylinder 1. The support plate 32 abuts tightly against the inside of the support cylinder 1 under the action of the elastic piece 33, and the support inclined surface 18 on the inside of the support cylinder 1 supports the anti-reflux valve 2.

[0068] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An anti-reflux stent for veins, characterized in that, Comprising: A support cylinder (1), a blood flow channel (12) is formed inside the support cylinder (1), and one end of the support cylinder (1) is formed with a blood inlet (11), and the other end is formed with a blood outlet (13), and both the blood inlet (11) and the blood outlet (13) are communicated with the blood channel; A support frame (14), the support frame (14) is installed inside the support cylinder (1), and the support frame (14) supports the support cylinder (1); An anti-reflux valve (2), the anti-reflux valve (2) is installed on one side of the support cylinder (1) close to the blood outlet (13), and a plurality of the anti-reflux valves (2) are arranged at intervals around the blood outlet (13); A disassembly component (3), the disassembly component (3) is installed inside the support cylinder (1), and the disassembly component (3) is used for disassembling the anti-reflux valve (2).

2. The anti-reflux stent for veins according to claim 1, wherein The disassembly component (3) includes an installation ring (31), a support plate (32) is arranged on the installation ring (31), a plurality of the support plates (32) are arranged at intervals around the installation ring (31), and a spring piece (33) is arranged between the plurality of support plates (32) and the installation ring (31), and two ends of the spring piece (33) are respectively connected with the installation ring (31) and the support plate (32), and the anti-reflux valve (2) is connected to the support plate (32).

3. The anti-reflux stent for veins according to claim 2, wherein A limiting groove (35) is formed between the spring piece (33) and the installation ring (31); a pull plate (34) is arranged on the spring piece (33), a guiding groove (311) is formed on the installation ring (31), one end of the pull plate (34) is connected to the spring piece (33), and the other end passes through the guiding groove (311), and a hook (341) is arranged at the end of the pull plate (34) passing through the guiding groove (311), and the hook (341) is located inside the installation ring (31).

4. The anti-reflux stent for veins according to claim 3, wherein, The hook (341) forms a guiding inclined surface (342) towards the side close to the installation ring (31), and the guiding inclined surface (342) faces the side close to the installation ring (31).

5. The anti-reflux stent for veins according to claim 1, characterized in that, Sealing gaskets (21) are arranged between a plurality of adjacent anti-reflux valves (2), and two adjacent sealing gaskets (21) are in contact with each other.

6. The anti-reflux stent for vein according to claim 5, characterized in that, A sealing part (22) is formed on one side of a plurality of the anti-reflux valves (2) away from the support cylinder (1), and the sealing part (22) reduces the flow of blood to one side of the support cylinder (1).

7. The anti-reflux stent for veins according to claim 6, characterized in that, A support inclined surface (18) is formed inside the support cylinder (1), and the support inclined surface (18) supports the anti-reflux valve (2).

8. The anti-reflux stent for vein according to claim 2, characterized in that A positioning groove (17) is formed inside the support cylinder (1), the support plate (32) is embedded in the positioning groove (17), and an anti-slip ring (15) is arranged on the outside of the support cylinder (1), and the anti-slip ring (15) is sleeved on the support cylinder (1).

9. The anti-reflux stent for veins according to claim 8, characterized in that, An anti-scratch inclined surface (16) is formed on one side of the support cylinder (1) close to the blood outlet (13), and the anti-scratch inclined surface (16) faces away from the support cylinder (1).

Images