Aorta anti-reflux stent

Abstract

The invention relates to an aorta anti-reflux stent, which comprises a first stent body and a second stent body which are coaxially arranged, and three connecting rods for connecting the first stent body and the second stent body, the first frame body comprises three positioning bodies which are sequentially connected end to end in the circumferential direction, and a first connecting point is formed at the joint of every two adjacent positioning bodies; the second frame body is of an annular structure, and three second connecting points are distributed on the near-end side of the second frame body at equal intervals. The center point of the second frame body is located on the far end side of the center point of the first frame body, and the three first connecting points are axially aligned with the three second connecting points respectively. The first connecting point is connected with the axially aligned second connecting point through a connecting rod; on the positioning body, the axial farthest end forms a positioning point, the axial nearest end forms a first connecting point, and the positioning point is located on the far end side of the second connecting point, so that the positioning body and the second frame body are partially overlapped in the axial direction. On one hand, the valve falling risk is avoided, and on the other hand, blood backflow can be prevented.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an aortic anti-reflux stent. Background Technology

[0002] After existing valve stents are implanted into blood vessels, the stent expands radially outward and presses against the original valve, thus replacing the original valve. In some cases, the valve annulus expands outward under the pressure of the valve stent, which increases the radial size of the valve annulus and may lead to the risk of valve stent loosening.

[0003] The prior art CN116849871A discloses an anti-regurgitation heart valve stent that is easy to clamp the leaflets. It is set on one side of the original heart valve leaflet by a positioning member and the fastener is set on the other side of the original heart valve leaflet. However, judging from the drawings of the prior art, the positioning member and the auxiliary member are completely misaligned, so it also has the aforementioned loosening problem. Summary of the Invention

[0004] In view of this, the present invention provides an aortic anti-reflux stent, wherein the positioning body is inserted into the radial outer side of the three native valves respectively, and the second frame is located on the radial inner side of the native valves. The positioning body and the second frame work together to clamp the native valves. Therefore, when the radial dimension of the valve annulus increases, the native valves cannot expand outward because they are clamped, thereby limiting the expansion of the valve annulus. On the one hand, this avoids the risk of valve dislodgement, and on the other hand, it can also prevent blood reflux.

[0005] The technical solution adopted in this invention: An aortic anti-reflux stent includes a first frame and a second frame arranged coaxially, and three connecting rods connecting the two. The first frame includes three positioning bodies connected end to end in a circumferential direction, and the connection between two adjacent positioning bodies constitutes the first connection point. The second frame is a ring structure with three second connection points evenly distributed on its proximal side; The center point of the second frame is located at the far end of the center point of the first frame, and the three first connection points are respectively aligned with the three second connection axes; The connecting rod is a long strip structure, and the length direction of the connecting rod is consistent with the axial direction. The first connection point and the axially aligned second connection point are connected by the connecting rod. On the positioning body, the farthest end in the axial direction constitutes a positioning point, and the nearest end in the axial direction constitutes the first connection point. The positioning point is located on the far side of the second connection point, so that the positioning body and the second frame part overlap in the axial direction. The first frame does not have a valve directly connected to it.

[0006] Preferably, the second frame body is divided into a first region and a second region in the axial direction, the first region is located on the proximal side of the second region, and the positioning body overlaps with the first region; In the axial direction, the ratio of the length of the first region to the length of the second region is 1:(1-2).

[0007] Preferably, the positioning body includes a main positioning component and an auxiliary positioning component; The main positioning component includes a first connecting strip and a second connecting strip arranged in a herringbone pattern, with their distal ends meeting to form a pointed tip, and the distance between them gradually decreasing from near to far. The auxiliary positioning component includes a third connecting strip and a fourth connecting strip arranged in a herringbone pattern, which meet at their near ends to form a vertex, and the distance between them gradually increases from near to far. The distal end of the third connecting strip is connected to the midpoint of the first connecting strip, and the distal end of the fourth connecting strip is connected to the midpoint of the second connecting strip, forming a rhomboid frame; The intersection points of the main positioning component and the auxiliary positioning component respectively form a third connection point and a fourth connection point that are axially aligned.

[0008] Preferably, in adjacent positioning bodies, the second connecting strip of the front positioning body and the first connecting strip of the rear positioning body are connected in a clockwise direction along the circumference to form a first connection point.

[0009] Preferably, the third connection point of each of the positioning bodies is radially outward inclined.

[0010] Preferably, the main positioning member has a gradually changing radial curvature, with a proximal radial tilt angle of 0°, a maximum tilt angle of 20° in the middle section, and a distal end that returns to 0°.

[0011] Preferably, a first extension joint is provided near the first connection point, and a second extension joint is provided near the fourth connection point; The axial length of the first extension joint is greater than that of the second extension joint, so that the connection point on the first extension joint is closer to the proximal side than the connection point on the second extension joint.

[0012] Preferably, the first extension joint includes a mating portion that extends coaxially with the connecting rod, the mating portion forming a continuous integral structure with the connecting rod.

[0013] Preferably, the second frame includes a plurality of rhombus structures connected sequentially in the circumferential direction. The plurality of rhombus structures include three first rhombus structures and the other rhombus structures are second rhombus structures. The number of second rhombus structures between any two adjacent first rhombus structures in the circumferential direction is the same, and each first rhombus structure is provided with a second connection point.

[0014] Preferably, the second frame is formed by circumferentially connecting three identical arc-shaped units; Each of the arc-shaped units includes a first parallelogram frame and a second parallelogram frame; The first parallelogram frame consists of an axially extending first pillar, a second pillar offset 60° circumferentially, and a proximal crossbar and a distal crossbar connecting the two, wherein the second pillar is axially offset distally relative to the first pillar. The second parallelogram frame is symmetrical to the first parallelogram frame, and the two form a conical structure by sharing the second pillar; In the arc-shaped unit, the two proximal crossbars form a triangular clearance zone; The proximal end of the first support column forms the second connection point and is integrally connected with the corresponding connecting rod. The distal extension of the positioning body is embedded within the triangular avoidance zone.

[0015] The beneficial effects of this invention are: The first frame is connected to the second frame via three connecting rods. When applied to the native valve, the three positioning bodies extend into the three native leaflets (radially outer side of the native leaflets), with the positioning points of the positioning bodies abutting against the roots of the corresponding native leaflets. Simultaneously, the three connecting rods pass through the three slits of the native valve, and the positioning bodies partially overlap with the second frame. The second frame is located radially inner side of the native valve, causing it to partially overlap with the native valve. In other words, the second frame clamps the roots of the native leaflets together from the inside and the positioning bodies from the outside. After implantation into the native valve, the entire anti-regurgitation stent will not expand radially. Therefore, when the valve annulus tends to expand, the anti-regurgitation stent can limit the outward expansion of the native valve, thereby limiting the outward expansion of the valve annulus and avoiding the risk of the valve stent falling out due to valve annulus expansion.

[0016] In addition, in some applications, a valvular stent can be placed inside the anti-reflux stent to replace the native valve. Since the anti-reflux stent clamps the native valve and the radial dimension of the anti-reflux stent remains basically unchanged after it is deployed, and the outer periphery of the valvular stent presses against the anti-reflux stent, the valvular stent will not fall off from the inside of the regurgitation stent, and the anti-reflux stent will not fall off either, thus ensuring the safety of the surgery. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which: Figure 1 This is a structural schematic diagram of the first embodiment of the anti-backflow support; Figure 2 yes Figure 1 Another view of the embodiment; Figure 3 This is a schematic diagram of the second embodiment of the anti-backflow support; Figure 4 This is a structural diagram of the third implementation of the anti-backflow support.

[0018] In the diagram: 1. First frame; 2. Second frame; 3. Connecting rod; 21. First rhombus structure; 22. Second rhombus structure; 23. Second connection point; 24. Avoidance zone; 101. First connecting strip; 102. Second connecting strip; 103. Third connecting strip; 104. Fourth connecting strip; 105. Positioning point; 106. Second extension joint; 107. First extension joint; 201. First support; 202. Second support; 203. Proximal crossbar; 204. Distal crossbar. Detailed Implementation

[0019] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail, but well-known methods, processes, procedures, and elements are not described in detail in order to avoid obscuring the essence of the present invention.

[0020] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0021] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than being exclusive or exhaustive; that is, meaning "including but not limited to."

[0022] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In this invention, during surgery, the side furthest from the operator is called "far" (the side closer to the heart), and the side closer to the operator is called "near" (the side furthest from the heart).

[0024] See Figures 1-4 The present invention provides an aortic anti-reflux stent (hereinafter referred to as "anti-reflux stent"), comprising a first frame 1 and a second frame 2 arranged coaxially, and three connecting rods 3 connecting the two; The first frame 1 includes three positioning bodies connected end to end in a circumferential direction, and the connection between two adjacent positioning bodies constitutes the first connection point; The second frame 2 is a ring structure, with three second connection points 23 evenly distributed on its proximal side; The center point of the second frame 2 is located at the far end of the center point of the first frame 1, and the three first connection points are respectively aligned with the three second connection axes; The connecting rod 3 is a long strip structure, and the length direction of the connecting rod 3 is consistent with the axial direction. The first connection point and the second connection point 23 aligned with the axial direction are connected by the connecting rod 3. On the positioning body, the farthest end in the axial direction constitutes the positioning point 105, and the nearest end in the axial direction constitutes the first connection point. The positioning point 105 is located on the far side of the second connection point 23, so that the positioning body partially overlaps with the second frame 2 in the axial direction. No valve is directly connected to the first frame 1.

[0025] The anti-reflux stent of this invention has two application scenarios, namely Scenario 1 and Scenario 2. In Scenario 1, for patients whose native valve is not completely damaged, the function of the native valve is restored and the anti-reflux stent is independently applied to the patient's native valve. In Scenario 2, for patients whose native valve is basically damaged, after the anti-reflux stent is anchored at the native valve, a valve stent is set in the middle of the anti-reflux stent, and the valve stent replaces the function of the native valve.

[0026] For the human body, the primary valve comprises three primary leaflets. When the three primary leaflets are closed, gaps are formed between them. In this invention, the length direction of the three connecting rods 3 is aligned with the axial direction of the anti-retrograde support. When applied to the primary valve, the three positioning bodies extend into the three primary leaflets respectively, and the positioning point 105 of the positioning body abuts against the root of the corresponding primary leaflet (at this time, the positioning body is located radially outside the primary valve). Simultaneously, the three connecting rods 3 pass through the three gaps of the primary valve, so that the second frame 2 is located radially inside the primary valve. Because the second frame 2 passes through the connecting rods 3... On the distal side, the second frame 2 is located on the distal side of the first frame 1, and the positioning body partially overlaps with the second frame 2 in the axial direction. The farthest end of the positioning body is the positioning point 105, so the positioning point 105 must overlap with the second frame 2. The second frame 2 is located inside the original valve, and the positioning body is located outside the original valve. Therefore, the overlapping parts of the positioning body and the second frame 2 clamp the root of the original leaflet on the inner and outer sides, respectively, thereby improving the ability of the original leaflet to open naturally. For patients whose original valve is not completely damaged, the purpose of the surgery can be achieved without implanting a valve stent, thus improving the surgical effect.

[0027] It is important to emphasize that the anti-reflux stent does not connect to an artificial valve. Instead, it restores the function of the original valve leaflet by clamping the base of the original leaflet, thereby solving the problem of blood reflux.

[0028] In addition, when traditional stents are anchored to the native valve, it is achieved through the external tension of the stent. As a result, the radial dimension of the valve annulus will increase under the action of this tension, which can cause the stent to loosen and, in severe cases, cause the stent to fall out.

[0029] The anti-reflux stent provided by the present invention relies on the positioning body and the second frame 2 to clamp the original leaflet. In other words, when the anti-reflux stent is anchored at the original valve, it does not rely on the outward expansion force of the anti-reflux stent. Since the outward expansion force is basically non-existent, the radial dimension of the valve annulus will not increase, thereby avoiding the situation of stent detachment.

[0030] Furthermore, even when the radial dimension of the valve annulus increases, the anti-reflux stent of the present invention will not fall off. Since the anti-reflux stent clamps the valve leaflet, the maximum radial dimension of the anti-reflux stent is fixed. That is to say, after the entire anti-reflux stent is deployed, the radial dimension of the anti-reflux stent will not continue to increase. Therefore, when the valve annulus has a tendency to expand, the anti-reflux stent can limit the expansion of the native valve, thereby limiting the expansion of the valve annulus and avoiding the risk of the stent falling off due to the expansion of the valve annulus.

[0031] In scenario two, since the patient's original valve has almost completely lost its function, an artificial valve is needed to replace it. Therefore, a valve stent needs to be implanted at the original valve site. The anti-regurgitation stent can be implanted at the original valve site first, as in scenario one. Then, the valve stent is implanted inside the anti-regurgitation stent. The valve stent unfolds, and the outer periphery of the valve stent rests on the inner side of the anti-regurgitation stent (the original valve leaflet is sandwiched between the two), thus anchoring the valve stent. Since there is no risk of the anti-regurgitation stent falling out, and the radial dimension of the anti-regurgitation stent will not continue to expand outward, the anti-regurgitation stent can effectively provide support between the valves, thus preventing the valve stent from falling out and improving the safety of the surgery.

[0032] Therefore, in scenario two, the anti-reflux stent can be used as an auxiliary stent to facilitate the anchoring of the valve stent at the native valve and can be adapted to most valve stents currently on the market, ensuring the surgical effect.

[0033] The second frame 2 is divided into a first region and a second region in the axial direction. The first region is located on the proximal side of the second region, and the positioning body overlaps with the first region. In the axial direction, the ratio of the length of the first region to the length of the second region is 1:(1-2).

[0034] The first region overlaps with the positioning body, and the ratio of the length of the first region to the length of the second region ensures that the first region has a certain axial length, thereby ensuring the clamping effect of the anti-backflow stent on the original leaflet and preventing the anti-backflow stent from falling off.

[0035] The positioning body includes a main positioning component and an auxiliary positioning component; The main positioning component includes a first connecting strip 101 and a second connecting strip 102 arranged in a herringbone pattern, with their distal ends meeting to form a pointed tip, and the distance between them gradually decreasing from near to far. The auxiliary positioning component includes a third connecting strip 103 and a fourth connecting strip 104 arranged in a herringbone pattern. The two end to meet at their proximal ends to form a vertex, and the distance between them gradually increases from near to far. The distal end of the third connecting strip 103 is connected to the midpoint of the first connecting strip 101, and the distal end of the fourth connecting strip 104 is connected to the midpoint of the second connecting strip 102, forming a rhomboid frame; The intersection points of the main positioning component and the auxiliary positioning component respectively form a third connection point and a fourth connection point that are axially aligned.

[0036] The positioning body is a rhomboid frame, which can be obtained by cutting a nickel-titanium alloy tube during the preparation of the anti-backflow support.

[0037] The first connection point is the proximal end of the positioning body, and the second connection point 23 is located on the second frame 2. The connecting rod 3 is connected to the first connection point and the second connection point 23, so that the connecting rod 3 basically runs through the entire first frame 1 in the axial direction. The distal end of the positioning body forms the positioning point 105, and the proximal end is connected to the first connection point and the connecting rod 3, so that the distal end of the positioning body can form a free end, which makes it convenient for the positioning body to be inserted into the outside of the original leaflet, which facilitates the implementation of the surgery.

[0038] The positioning body consists of a main positioning component and an auxiliary positioning component, which simplifies the structure of the positioning body. A rhomboid frame is formed on the positioning body, which makes the positioning body easy to compress and unfold.

[0039] In adjacent positioning bodies, the second connecting strip 102 of the front positioning body and the first connecting strip 101 of the rear positioning body are connected in a clockwise direction along the circumference to form a first connection point.

[0040] The third connection point of each of the positioning bodies is radially outward inclined.

[0041] That is, when the anti-reflux stent is deployed, the positioning point 105 of the positioning body is tilted outward, which makes it easier for the positioning point 105 of the positioning body to be inserted into the outer side of the original leaflet, thus facilitating the operation.

[0042] See Figure 2 The main positioning component has a gradually changing radial curvature, with a radial tilt angle of 0° at the proximal end, a maximum tilt angle of 20° in the middle section, and a return to 0° at the distal end.

[0043] From near to far, the radial outward tilt angle of the main positioning element gradually increases from 0° to 20°, and then decreases back to 0°, so that the extension direction of the positioning point 105 of the positioning body is basically parallel to the axis of the anti-reflux stent, and the positioning point 105 is located radially outside the second frame 2. When the anti-reflux stent is implanted into the native valve, the positioning point 105 can be easily inserted into the outside of the native valve leaflet, and the orientation of the positioning point 105 is consistent with the axis of the anti-reflux stent, so that the positioning point 105 will not face the blood vessel wall, avoid the positioning point 105 scratching the blood vessel wall, and ensure the safety of the interventional surgery.

[0044] The first connection point is provided with a first extension joint 107 near its end, and the fourth connection point is provided with a second extension joint 106 near its end. The axial length of the first extension joint 107 is greater than that of the second extension joint 106, so that the connection point on the first extension joint 107 is closer to the proximal side than the connection point on the second extension joint 106.

[0045] For ease of description, the connection point on the first extension connector 107 is designated as connection point number one, and the connection point on the second extension connector 106 is designated as connection point number two. Axially, all three connection points number one are located in the same position, and all three connection points number two are located in the same position. Connection points number one and number two are offset, with connection point number one being closer to the proximal end than connection point number two. During interventional surgery, when deploying the anti-reflux stent, since connection point number two is farther away, it is deployed first. At this time, the three positioning bodies unfold, facilitating the insertion of the positioning point 105 of the positioning body into the outer side of the original leaflet. The posture of the anti-reflux stent can be controlled through the still-connected connection point number one. In special cases, the entire anti-reflux stent can also be retrieved through the still-connected connection point number one. After the positioning bodies are aligned, the three connection points number one are then deployed, thus achieving successful implantation of the anti-reflux stent.

[0046] The first extension joint 107 includes a mating portion extending coaxially with the connecting rod 3, and the mating portion and the connecting rod 3 form a continuous integral structure. That is, the first extension joint 107 is aligned with the connecting rod 3 and integrally formed. When conveying the anti-backflow bracket, the force point of the anti-backflow bracket is the first connection point, and the force is transmitted along the first extension joint 107. Since the first extension joint 107 is directly connected to the connecting rod 3 as one unit, the transmitted force can be directly applied to the second frame 2 along the connecting rod 3, ensuring that the entire anti-backflow bracket can be smoothly conveyed into place.

[0047] The second frame 2 includes multiple rhombus structures connected sequentially in the circumferential direction. The multiple rhombus structures include three first rhombus structures 21 and other rhombus structures are second rhombus structures 22. The number of second rhombus structures 22 between any two adjacent first rhombus structures 21 in the circumferential direction is the same. Each first rhombus structure 21 is provided with a second connection point 23.

[0048] The specific structure of the second frame 2 is designed to facilitate its cutting from nickel-titanium alloy tubes. The use of a diamond-shaped structure allows the second frame 2 to expand and contract radially.

[0049] It is worth noting that the second frame 2 is annular in shape. When it is in the contracted state, the positioning body and the second frame 2 will overlap. Therefore, when it is impossible to form an anti-backflow bracket by cutting a nickel-titanium alloy tube, the positioning point 105 of the positioning body can be folded and cut towards the proximal side. Then, by pulling the positioning point 105 of the positioning body towards the distal side, the distal part of the positioning body is folded towards the distal side. After shaping, the anti-backflow bracket can be obtained.

[0050] See Figure 3 In another alternative embodiment, the second frame 2 is formed by three identical arc-shaped units connected circumferentially; Each of the arc-shaped units includes a first parallelogram frame and a second parallelogram frame; The first parallelogram frame is composed of an axially extending first pillar 201, a second pillar 202 offset 60° circumferentially, and a proximal crossbar 203 and a distal crossbar 204 connecting the two, wherein the second pillar 202 is axially offset distally relative to the first pillar 201. The second parallelogram frame is symmetrical to the first parallelogram frame, and the two form a conical structure by sharing the second support column 202; In the arc-shaped unit, the two proximal crossbars 203 form a triangular clearance area 24; The proximal end of the first support column 201 forms the second connection point 23, which is integrally connected with the corresponding connecting rod 3; The distal extension of the positioning body is embedded within the triangular avoidance area 24.

[0051] In the contracted state, the distal extension of the positioning body is also embedded in the avoidance area 24, so the counterflow support can be obtained by cutting directly through the nickel-titanium alloy tube. Compared with the second frame 2 with the diamond structure, the positioning body does not need to be folded.

[0052] It should be understood that the above embodiments are merely exemplary and not restrictive. Various obvious or equivalent modifications or substitutions that can be made by those skilled in the art regarding the above details without departing from the basic principles of the present invention will be included within the scope of the claims of the present invention.

Claims

1. An anti-reflux aortic stent, characterized in that, It includes a first frame and a second frame that are coaxially arranged, and three connecting rods that connect the two. The first frame includes three positioning bodies connected end to end in a circumferential direction, and the connection between two adjacent positioning bodies constitutes the first connection point. The second frame is a ring structure with three second connection points evenly distributed on its proximal side; The center point of the second frame is located at the far end of the center point of the first frame, and the three first connection points are respectively aligned with the three second connection axes; The connecting rod is a long strip structure, and the length direction of the connecting rod is consistent with the axial direction. The first connection point and the axially aligned second connection point are connected by the connecting rod. On the positioning body, the farthest end in the axial direction constitutes a positioning point, and the nearest end in the axial direction constitutes the first connection point. The positioning point is located on the far side of the second connection point, so that the positioning body and the second frame part overlap in the axial direction. The first frame does not have a valve directly connected to it.

2. The aortic anti-reflux stent according to claim 1, characterized in that, The second frame is divided into a first region and a second region in the axial direction. The first region is located on the proximal side of the second region, and the positioning body overlaps with the first region. In the axial direction, the ratio of the length of the first region to the length of the second region is 1:(1-2).

3. The aortic anti-reflux stent according to claim 2, characterized in that, The positioning body includes a main positioning component and an auxiliary positioning component; The main positioning component includes a first connecting strip and a second connecting strip arranged in a herringbone pattern, with their distal ends meeting to form a pointed tip, and the distance between them gradually decreasing from near to far. The auxiliary positioning component includes a third connecting strip and a fourth connecting strip arranged in a herringbone pattern, which meet at their near ends to form a vertex, and the distance between them gradually increases from near to far. The distal end of the third connecting strip is connected to the midpoint of the first connecting strip, and the distal end of the fourth connecting strip is connected to the midpoint of the second connecting strip, forming a rhomboid frame; The intersection points of the main positioning component and the auxiliary positioning component respectively form a third connection point and a fourth connection point that are axially aligned.

4. The aortic anti-reflux stent according to claim 3, characterized in that, In adjacent positioning bodies, the second connecting strip of the front positioning body and the first connecting strip of the rear positioning body are connected in a clockwise direction along the circumference to form a first connection point.

5. The aortic anti-reflux stent according to claim 4, characterized in that, The third connection point of each of the positioning bodies is radially outward inclined.

6. The aortic anti-reflux stent according to claim 4, characterized in that, The main positioning component has a gradually changing radial curvature, with a radial tilt angle of 0° at the proximal end, a maximum tilt angle of 20° in the middle section, and a return to 0° at the distal end.

7. The aortic anti-reflux stent according to claim 3, characterized in that, The first connection point is provided with a first extension joint near its end, and the fourth connection point is provided with a second extension joint near its end; The axial length of the first extension joint is greater than that of the second extension joint, so that the connection point on the first extension joint is closer to the proximal side than the connection point on the second extension joint.

8. The aortic anti-reflux stent according to claim 7, characterized in that, The first extension joint includes a mating portion that extends coaxially with the connecting rod, the mating portion and the connecting rod forming a continuous integral structure.

9. The aortic anti-reflux stent according to any one of claims 1-8, characterized in that, The second frame includes multiple rhombus structures connected sequentially in the circumferential direction. The multiple rhombus structures include three first rhombus structures and the other rhombus structures are second rhombus structures. The number of second rhombus structures between any two adjacent first rhombus structures in the circumferential direction is the same. Each first rhombus structure is provided with a second connection point.

10. The aortic anti-reflux stent according to any one of claims 1-8, characterized in that, The second frame is composed of three identical arc-shaped units connected circumferentially; Each of the arc-shaped units includes a first parallelogram frame and a second parallelogram frame; The first parallelogram frame consists of an axially extending first pillar, a second pillar offset 60° circumferentially, and a proximal crossbar and a distal crossbar connecting the two, wherein the second pillar is axially offset distally relative to the first pillar. The second parallelogram frame is symmetrical to the first parallelogram frame, and the two form a conical structure by sharing the second pillar; In the arc-shaped unit, the two proximal crossbars form a triangular clearance zone; The proximal end of the first support column forms the second connection point and is integrally connected with the corresponding connecting rod. The distal extension of the positioning body is embedded within the triangular avoidance zone.

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