Self-cleaning intravascular stent

Abstract

The invention relates to a self-cleaning intravascular stent, which belongs to the technical field of intravascular stents.The self-cleaning intravascular stent comprises a stent body and is characterized by further comprising a power receiving mechanism and a power resistance reducing mechanism, the stent body comprises a stent body inlet end, a stent body outlet end and a connecting section, and the power receiving mechanism comprises a spiral rotating blade; the spiral rotating blade extends to the outflow end of the support body from the inlet end of the support body, the power resistance reduction mechanism comprises a suspension seat arranged at the outflow end of the support body and a magnetic seat isolated from the suspension seat through magnetic force, the suspension seat is fixed to the spiral rotating blade, and the magnetic seat is elastically fixed to the support body. Blood flow power is fully received through the power receiving mechanism, the rotary cutting blades are driven to rotate, self-cleaning is carried out, the contact friction force between the power receiving mechanism and the bottom of the support is zero through the resistance reducing mechanism in a magnetic suspension state formed by the power receiving mechanism and the bottom of the support, and therefore resistance-free rotary cleaning is achieved, and movement is smoother.

Description

Technical Field

[0001] The present invention relates to the technical field of vascular stents, in particular to a self-cleaning vascular stent. Background Art

[0002] While implanted stents support the vessel wall and prevent collapse, they cannot completely prevent the proliferation and migration of cells lining the vessel. The presence of the stent stimulates endothelial cells, triggering an inflammatory response, which in turn activates a series of cellular signaling pathways, prompting smooth muscle cells and other cells to proliferate and migrate into the vascular intima. The stent's structure cannot fundamentally regulate the behavior of these cells, nor can it prevent the synthesis and deposition of the extracellular matrix. Over time, this can easily lead to excessive growth of proliferative tissue in the vessel wall, potentially causing further vascular stenosis.

[0003] In response to the above problem, there is also an existing technology that proposes to use blood flow pressure to rotate the rotating drum for cleaning. However, the rotating drum is very likely to be squeezed to the bottom of the drum under the action of blood flow pressure and cannot rotate. At the same time, it has no power receiving mechanism and cannot normally receive blood flow pressure, resulting in the inability to achieve true self-cleaning. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to propose a self-cleaning vascular stent, which fully receives power through a power receiving mechanism to drive the rotary cutting blades to rotate and perform self-cleaning, and then forms a magnetic suspension state with the bottom of the stent through the power receiving mechanism, so that the contact friction between the two is zero, thereby achieving frictionless rotation and completing self-cleaning, so as to solve the problem that the existing technology cannot truly achieve self-cleaning due to weak power and large friction resistance.

[0005] The present invention is achieved through the following technical solutions:

[0006] A self-cleaning vascular stent includes a stent body, and is characterized in that it also includes a power receiving mechanism and a power drag reduction mechanism arranged in the stent body, the stent body includes a stent body entry end, a stent body outlet end and a connecting section arranged therebetween, the power receiving mechanism includes a spiral rotating blade, the spiral rotating blade extends from the stent body entry end to the stent body outlet end, the power drag reduction mechanism includes a suspension seat arranged at the stent body outlet end and a magnetic seat isolated from the suspension seat by magnetic force, the suspension seat is fixed to the spiral rotating blade, and the magnetic seat is elastically fixed to the stent body.

[0007] Furthermore, a cutting blade is provided on the periphery of the spiral rotating blade, and the connecting section is provided with a cleaning window for the cutting blade to clean the proliferative tissue of the tube wall.

[0008] Furthermore, the inlet end of the bracket body and the outlet end of the bracket body are the same thin-walled tube body, the connecting section is a plurality of connecting strips connected in a ring shape between the two thin-walled tube bodies, and the gap between the connecting strips is the cleaning window.

[0009] Furthermore, the suspension seat and the magnetic seat are both annular permanent magnets, and the adjacent sides thereof are set to have the same magnetism.

[0010] Furthermore, a support platform is provided at the outflow end of the bracket body, a pressure spring is fixedly provided on the support platform, and the other end of the pressure spring is fixedly connected to the magnetic base.

[0011] Furthermore, expansion air bags are provided on the outer walls of the inlet end and the outlet end of the stent body.

[0012] Furthermore, the connecting bars are cylindrical in shape, and 6 to 10 bars are arranged on the circumference.

[0013] Furthermore, the inner and outer surfaces of the support body, the power receiving mechanism and the power drag reduction mechanism are all coated with a medical-grade PTFE coating.

[0014] The beneficial effects of the present invention are:

[0015] The present application fully receives the blood flow power through the power receiving mechanism, drives the spiral rotating blades to rotate, and performs self-cleaning. Then, through the magnetic levitation state drag reduction mechanism formed by the power receiving mechanism and the bottom of the bracket, the contact friction between the two is reduced to zero, thereby achieving resistance-free rotation cleaning. Moreover, since the spiral rotating blades themselves are also a receiving mechanism, one set of mechanisms realizes two functions, further reducing their own resistance and making the movement smoother.

[0016] The present application designs a pressure spring at the rear end of the magnetic seat. When the force exerted on the suspension seat by the impact of blood flow changes, the force between it and the magnetic seat will also change, thereby causing the force between the magnetic seat and the pressure spring to change, thereby causing the deformation of the spring to change. The blood flow pressure is always changing, and the deformation of the pressure spring will lag behind the change in this pressure, thus forming an unstable system that is always in imbalance, and the rotation cleaning operation is naturally realized in this imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 It is the front view of the present invention;

[0019] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0020] Figure 4 Schematic diagram of a spiral rotating blade.

[0021] Description of reference numerals:

[0022] 1-bracket body; 101-bracket body inlet end; 102-bracket body outlet end; 103-connecting section; 104-inflatable airbag; 105-cleaning window; 106-connecting strip; 2-power receiving mechanism; 201-spiral rotating blade; 202-cutting blade; 3-power drag reduction mechanism; 301-suspension seat; 302-magnetic seat; 303-support platform; 304-pressure spring. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0025] like Figure 1-4 As shown, an embodiment of the present invention provides a self-cleaning vascular stent, the overall structure of which includes:

[0026] The self-cleaning vascular stent consists primarily of three parts: the stent body 1, a power receiving mechanism 2, and a power drag reduction mechanism 3. Its design aims to achieve the self-cleaning function of the vascular stent in vivo, reduce obstruction of the blood vessels by proliferative tissue on the vascular wall, and improve the effectiveness and lifespan of the stent. The structure and function of each part are described in detail below:

[0027] 1. Bracket body 1

[0028] Components: The stent body 1 includes a stent body inlet end 101, a stent body outlet end 102 and a connecting section 103.

[0029] The stent inlet end 101 and the stent outlet end 102 are identical thin-walled tubes. This structural design facilitates smooth implantation of the stent 1 within the blood vessel and facilitates blood flow. Furthermore, an expansion balloon 104 is installed on the outer wall of each stent. After implantation, the balloon 104 inflates, allowing the stent 1 to better conform to the vessel wall, securing its position and preventing displacement.

[0030] Connecting section 103: Connecting section 103 consists of multiple connecting bars 106, arranged in a circular pattern, connecting the two thin-walled tubes. These connecting bars 106 are cylindrical in shape, facilitating point contact with the spiral blades, further reducing the blades' rotational resistance. Six to ten connecting bars are positioned around the circumference. The gaps between connecting bars 106 form cleaning windows 105, which provide space for the cutting blades in the power receiving mechanism to clear hyperplastic tissue from the blood vessel walls.

[0031] 2. Power receiving mechanism 2

[0032] Spiral Rotating Blade 201: The core component of the power receiving mechanism, spiral rotating blade 201 extends from the stent body inlet end 101 to the stent body outlet end 102. As blood flows through the blood vessel, it impacts spiral rotating blade 201, causing it to rotate. Cutting edges 202 are located on the periphery of the spiral rotating blade. As the spiral rotating blade rotates, the cutting edges cut and clear hyperplastic tissue on the vessel wall through the cleaning window in the connecting section, thereby maintaining blood vessel patency.

[0033] 3. Power drag reduction mechanism 3

[0034] Suspended seat 301 and magnetic seat 302: The dynamic drag reduction mechanism 3 is mainly composed of a suspended seat 301 arranged at the outflow end of the bracket body and a magnetic seat 302 isolated from the suspended seat by magnetic force. The suspended seat 301 and the magnetic seat 302 are both circular permanent magnets, and the adjacent sides of the two are set to the same magnetic properties. According to the principle that like magnetic poles repel each other, a repulsive force will be generated between the suspended seat 301 and the magnetic seat 302. For example, if the suspended seat 301 is set to the N pole and the magnetic seat 302 is also set to the N pole, the two repel each other, causing the suspended seat 301 to suspend. The suspended seat 301 is fixed to the spiral rotating blade 201, so that the spiral rotating blade is also suspended, reducing the friction and resistance of the spiral rotating blade 201 during rotation, and improving the rotation efficiency of the blade.

[0035] It should be noted here that the repulsive force between the suspension seat 301 and the magnetic seat 302 can be reasonably set by the magnitude of the magnetic field force so that there is a certain residual force after offsetting the approach force formed by the blood flow.

[0036] When permanent magnets such as neodymium iron boron are implanted in the human body, long-term contact with human blood can cause oxidation and corrosion on the magnet surface, releasing heavy metal ions with strong biotoxicity. To address this issue, this embodiment applies a protective film to the exterior of the permanent magnet. This film can be a medical-grade PTFE coating, which can be precisely attached to the magnetic metal surface using ultrasonic spraying technology.

[0037] Support platform 303 and pressure spring 304: The outflow end 102 of the stent body is also provided with a support platform 303. A pressure spring 304 is fixedly mounted on the support platform 303. The other end of the pressure spring 304 is fixedly connected to the magnetic base 302. The pressure spring 304 functions to elastically support the magnetic base 302. When the spiral rotating blades 201 and the magnetic base 302 are subjected to external impact or pressure changes caused by blood flow, the pressure spring 304 can buffer and adjust the position of the magnetic base 302, ensuring the stability of the dynamic drag reduction mechanism 3 and maintaining dynamic stability of the entire system.

[0038] Another benefit of this structure is that as the blood pressure constantly changes, the position of the magnetic base 302 in the blood vessel also changes, thereby driving the position of the spiral rotating blade 201 to change. During this change process, the active area of the spiral rotating blade 201 is much larger than its own length, thereby achieving cleaning of a larger area, thereby reducing the risk of blood vessel wall hyperplasia tissue re-blocking the blood vessel.

[0039] 4. Surface coating

[0040] The inner and outer surfaces of the stent body, power receiving mechanism, and power drag reduction mechanism are coated with medical-grade PTFE coating. Medical-grade PTFE coating is widely used in medical devices such as vascular stents, catheters, and surgical instruments. It has low friction and chemical corrosion resistance. Ultrasonic spraying technology is used to achieve uniform coating and high safety.

[0041] In summary, the self-cleaning vascular stent, through its unique structural design, uses the power of blood flow to achieve automatic cleaning of proliferative tissue on the vascular wall. At the same time, it improves the cleaning efficiency through the dynamic drag reduction mechanism, and the surface coating further enhances the performance and safety of the stent.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A self-cleaning vascular stent, comprising a stent body, characterized in that: It also includes a power receiving mechanism and a power drag reduction mechanism arranged in the bracket body, the bracket body includes a bracket body entrance end, a bracket body outlet end and a connecting section arranged therebetween, the power receiving mechanism includes a spiral rotating blade, the spiral rotating blade extends from the bracket body entrance end to the bracket body outlet end, the power drag reduction mechanism includes a suspension seat arranged at the bracket body outlet end and a magnetic seat isolated from the suspension seat by magnetic force, the suspension seat is fixed to the spiral rotating blade, and the magnetic seat is elastically fixed to the bracket body.

2. The self-cleaning vascular stent according to claim 1, characterized in that: The outer periphery of the spiral rotating blade is provided with a cutting blade, and the connecting section is provided with a cleaning window for the cutting blade to clean the proliferative tissue of the tube wall.

3. The self-cleaning vascular stent according to claim 1, characterized in that: The inlet end and the outlet end of the bracket body are the same thin-walled tube body, the connecting section is a plurality of connecting strips connected in a ring shape between the two thin-walled tube bodies, and the gap between the connecting strips is the cleaning window.

4. The self-cleaning vascular stent according to claim 1, characterized in that: The suspension seat and the magnetic seat are both circular permanent magnets, and the adjacent sides thereof are arranged to have the same magnetic properties.

5. The self-cleaning vascular stent according to claim 1, characterized in that: A support platform is further provided at the outflow end of the bracket body, a pressure spring is fixedly provided on the support platform, and the other end of the pressure spring is fixedly connected to the magnetic base.

6. The self-cleaning vascular stent according to any one of claims 1 to 5, characterized in that: Expansion air bags are provided on the outer walls of the inlet end and the outlet end of the bracket body.

7. The self-cleaning vascular stent according to claim 3, characterized in that: The connecting bars are cylindrical in shape, and 6 to 10 of them are arranged on the circumference.

8. The self-cleaning vascular stent according to any one of claims 1 to 5, characterized in that: The inner and outer surfaces of the support body, the power receiving mechanism and the power drag reduction mechanism are all coated with a medical-grade PTFE coating.

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