Aortic covered stent

Abstract

The present invention relates to the technical field of medical devices for cardiovascular diseases. Disclosed is an aortic covered stent. The aortic covered stent comprises a supporting stent, a sealing layer, and an elastic connecting layer. The sealing layer is spaced apart from and sleeved on the outer periphery of the supporting stent. The sealing layer comprises a first covering film. The elastic connecting layer is connected between the supporting stent and the sealing layer, such that blood flow can circulate between the supporting stent and the sealing layer. With the pulsation of the aorta, the sealing layer and the elastic connecting layer undergo elastic deformation, so that the first covering film is always closely attached to the aortic blood vessel wall adjacent to the sealing layer. The aortic covered stent can be well adapted to the special morphology of ascending aortic dissection and the mechanical characteristics of blood flow, offering high stability and exhibiting good sealing performance on the ascending aortic wall.

Description

A type of aortic endovascular stent Technical Field

[0001] This invention relates to the field of cardiovascular medical device technology, and more particularly to an aortic endovascular stent graft. Background Technology

[0002] Based on current technology, most treatments for aortic dissection involving the ascending aorta involve surgical intervention, specifically surgical replacement of the affected segment with a prosthetic vascular graft. However, this surgery is extensive, involves complex anastomosis, requires cardiopulmonary bypass, and is highly invasive with numerous complications. While interventional treatment of the ascending aorta is also used due to these issues, the unique characteristics of aortic dissection—such as significant morphological changes in the ascending aorta with cardiac pulsation, a short ascending aorta, a lack of aortic anchorage due to dissection involvement, a short distance between the lesion and the coronary ostia and aortic valves, and involvement of supra-aortic branches—make conventional aortic stents often unsuitable for aortic dissection.

[0003] Therefore, there is an urgent need for an aortic endovascular stent graft to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of this invention is to provide an aortic endovascular stent graft that is well adapted to the special morphology and blood flow mechanical characteristics of ascending aortic dissection, has high stability, and provides good sealing to the aortic wall.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An aortic endovascular stent graft, comprising:

[0007] Support bracket;

[0008] A sealing layer is spaced out and sleeved around the outer periphery of the support bracket, the sealing layer including a first film;

[0009] An elastic connecting layer is provided between the support frame and the sealing layer, allowing blood flow between the support frame and the sealing layer;

[0010] As the aorta pulsates, the sealing layer and the elastic connecting layer undergo elastic deformation to ensure that the first membrane remains in close contact with the wall of the aorta adjacent to the sealing layer.

[0011] As a preferred embodiment of an aortic endovascular stent graft, the sealing layer further includes a sealing framework, on which the first graft covers the sealing framework.

[0012] As a preferred embodiment of aortic endovascular stent graft, the elastic connection layer comprises multiple layers of elastic skeletons along the axial direction of the supporting stent and the occlusive layer, with each layer of the elastic skeleton connected between the supporting stent and the occlusive layer, and each adjacent pair of elastic skeletons being connected or not connected.

[0013] As a preferred embodiment of aortic endovascular stent graft, each layer of the elastic skeleton includes a plurality of circumferential connecting wires, the two ends of each connecting wire being connected to the supporting stent and the sealing layer respectively, and each pair of adjacent connecting wires being connected or not connected.

[0014] As a preferred embodiment of aortic endovascular stent graft, the connecting wire is either straight or wavy.

[0015] As a preferred embodiment of aortic endovascular stent graft, each layer of the elastic skeleton includes at least one connecting ring, with two opposite points on each connecting ring connected to the supporting stent and the sealing layer, respectively, and each pair of adjacent connecting rings may or may not be connected.

[0016] As a preferred embodiment of an aortic endovascular stent graft, the supporting stent includes a supporting framework, at least a portion of which is covered by a second endovascular membrane, the second endovascular membrane being provided with or without openings.

[0017] As a preferred embodiment of an aortic endovascular stent graft, the elastic connection layer includes a blood-coagulating material that fills the space between the supporting stent and the sealing layer.

[0018] Alternatively, an anti-condensation material may be provided between the support bracket and the sealing layer.

[0019] As a preferred embodiment of aortic endovascular stent graft, the supporting stent and the sealing layer are coaxial.

[0020] As a preferred embodiment of aortic endovascular stent graft, it also includes an anchoring stent, one end of which is inserted into or fixedly connected to one end of the supporting stent. The anchoring stent can be anchored in the left ventricular outflow tract, the aortic root, the aortic prosthetic valve, the aortic arch, or an artificial blood vessel or stent in the aorta.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention provides an aortic endovascular stent graft, comprising a supporting stent, a sealing layer, and an elastic connecting layer. The supporting stent provides stable support, enabling the aortic endovascular stent graft to remain relatively stable in the complex blood flow environment of the ascending aorta, without significant swaying or displacement with blood flow. During aortic pulsation, the elastic connecting layer and the sealing layer undergo elastic deformation, contracting or expanding along with the aorta. This ensures that the sealing layer remains firmly attached to the adjacent vessel wall of the aorta, effectively sealing the aortic dissection tear and reducing or preventing blood flow from entering the false lumen through the aortic tear. Furthermore, it effectively prevents the sealing layer from damaging fragile structures. The weak aortic wall, especially the intimal tissue around the tear, causes damage. Simultaneously, as blood flows through this aortic endovascular stent, a portion is diverted between the supporting stent and the sealing layer. This ensures the sealing layer has sufficient space and a stress-bearing environment to contract and expand with the pulsation of the ascending aorta, while also mitigating the impact of blood flow on the sealing layer. This reduces the force transmitted from the sealing layer to the adjacent vessel wall (especially the fragile intimal tissue) due to blood flow impact. It also reduces the lateral impact on the stent caused by blood flow along the vessel axis, thus minimizing the influence of blood flow on the stability of the stent. This aortic endovascular stent has a high compatibility with the ascending aorta, which undergoes significant morphological variations during pulsation, and is well-suited to the specific morphology and biomechanical characteristics of ascending aortic dissection. Compared to existing aortic endovascular stents, this stent exerts less stress on the ascending aortic vessel wall and intimal flap, effectively reducing damage to the ascending aortic vessel wall caused by the aortic endovascular stent. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0024] Figure 1 is a structural schematic diagram of the support bracket and sealing layer provided in an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the supporting frame and the closed frame provided in an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the structure of the aortic endovascular stent graft connected to the distal end of the supporting stent according to an embodiment of the present invention.

[0027] Figure 4 is a schematic diagram of the structure of the aortic endovascular stent graft connected to the proximal end of the support stent according to an embodiment of the present invention.

[0028] Figure 5 is a second structural schematic diagram of the supporting frame and the closed frame provided in an embodiment of the present invention;

[0029] Figure 6 is a schematic diagram of the structure of the aortic endovascular stent graft connected to the distal end of the supporting stent according to an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of the supporting frame and the closed frame provided in an embodiment of the present invention;

[0031] Figure 8 is a schematic diagram of the structure of the aortic endovascular stent graft connected to the proximal end of the supporting stent according to an embodiment of the present invention;

[0032] Figure 9 is a top view of the aortic endovascular stent graft provided in Embodiment 1 of the present invention (anchoring stent not shown);

[0033] Figure 10 is a top view of the aortic endovascular stent graft provided in Embodiment 1 of the present invention (anchoring stent not shown);

[0034] Figure 11 is a top view three of the aortic endovascular stent graft provided in Embodiment 1 of the present invention (anchoring stent not shown);

[0035] Figure 12 is a top view of the aortic endovascular stent graft provided in Embodiment 1 of the present invention (anchoring stent not shown);

[0036] Figure 13 is a top view of the aortic endovascular stent graft provided in Embodiment 1 of the present invention (anchoring stent not shown);

[0037] Figure 14 is a top view of the aortic endovascular stent graft provided in Embodiment 4 of the present invention (anchoring stent not shown);

[0038] Figure 15 is a top view of the aortic endovascular stent graft provided in Embodiment 4 of the present invention (anchoring stent not shown);

[0039] Figure 16 is a top view of the aortic endovascular stent graft provided in Embodiment 4 of the present invention (anchoring stent not shown);

[0040] Figure 17 is a cross-sectional view of the aortic endovascular stent graft provided in an embodiment of the present invention (anchoring stent not shown);

[0041] Figure 18 is a cross-sectional view of the aortic endovascular stent graft provided in an embodiment of the present invention (anchoring stent not shown);

[0042] Figure 19 is a cross-sectional view three of the aortic endovascular stent graft provided in an embodiment of the present invention (anchoring stent not shown);

[0043] Figure 20 is a cross-sectional view four of the aortic endovascular stent graft provided in an embodiment of the present invention (anchoring stent not shown).

[0044] In the figure: 1. Support bracket; 11. Support skeleton; 12. Second film; 2. Sealing layer; 21. Sealing skeleton; 22. First film; 3. Elastic connecting layer; 31. Elastic skeleton; 311. Connecting wire; 312. Connecting ring; 4. Anchor bracket. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0049] Example 1

[0050] As shown in Figures 1 to 20, this embodiment provides an aortic endovascular stent graft, which is applicable to the treatment of the entire aorta, especially the ascending aorta. Specifically, the aortic endovascular stent graft includes a supporting stent 1, a sealing layer 2, and an elastic connecting layer 3. The sealing layer 2 is spaced around the periphery of the supporting stent 1 and includes a first covering 22. The elastic connecting layer 3 connects the supporting stent 1 and the sealing layer 2, allowing blood flow between the supporting stent 1 and the sealing layer 2. With the pulsation of the aorta, the sealing layer 2 and the elastic connecting layer 3 undergo elastic deformation, so that the sealing layer 2 always adheres tightly to the aorta and the vessel wall adjacent to the sealing layer. Taking the aortic endovascular stent graft applicable to the ascending aorta as an example, the stent 1 provides stable support, enabling the aortic endovascular stent graft to remain stable in the ascending aorta under complex blood flow conditions. When the ascending aorta pulsates, the elastic connecting layer 3 and the sealing layer 2 undergo elastic deformation, contracting or expanding along with the ascending aorta. This ensures that the sealing layer 2 remains tightly attached to the wall adjacent to the ascending aorta and the sealing layer (including the normal ascending aortic vessel wall and the torn intima patch tissue), thus sealing the intima tear of the ascending aorta. This prevents or reduces blood flow from entering the false lumen through the aortic tear and effectively prevents the sealing layer 2 from damaging the fragile ascending aorta. The aorta, especially the torn intima, suffers damage. Simultaneously, blood flow is shunted as it passes through the aortic stent graft, with some entering between the supporting stent 1 and the sealing layer 2. This ensures that the sealing layer 2 has sufficient space and a stress-bearing environment to contract and expand with the pulsation of the ascending aorta, while also mitigating the impact of blood flow on the sealing layer 2. This reduces the force transmitted from the sealing layer 2 to the adjacent vessel wall (especially the fragile dissected intima) due to blood flow impact, and also reduces the lateral impact on the aortic stent graft caused by blood flow along the vessel axis, thus reducing the impact of blood flow on the stability of the aortic stent graft. This aortic stent graft has a high compatibility with the ascending aorta, which undergoes significant morphological variations during pulsation, and is well-suited to the special morphology and biomechanical characteristics of ascending aortic dissection. Compared to existing arterial stents, this aortic stent graft exerts less stress on the ascending aortic vessel wall and intima, effectively reducing damage to the ascending aortic vessel wall caused by the aortic stent graft.

[0051] Optionally, the sealing layer 2 further includes a sealing skeleton 21, and the first covering film 22 covers the sealing skeleton 21. That is, the elastic connecting layer 3 can be connected between the sealing skeleton 21 and the support bracket 1, or the first covering film 22 can be directly sleeved on the outside of the elastic connecting layer 3.

[0052] Preferably, the support stent 1 and the sealing layer 2 are coaxial. For example, the support stent 1 is cylindrical, the sealing layer 2 is cylindrical, and the cross-sections of the support stent 1 and the sealing layer 2 are two concentric circles. The coaxial arrangement of the support stent 1 and the sealing layer 2 ensures more uniform circumferential stress on both, and also ensures more uniform stress on the periphery of the ascending aorta, preventing damage caused by excessive stress in any one area of ​​the ascending aorta. Of course, in other embodiments, the support stent 1 and the sealing layer 2 may be non-coaxial, depending on actual needs.

[0053] Specifically, as shown in Figures 1 and 2, the support frame 1 includes a support skeleton 11, the stiffness of which is greater than that of the closing skeleton 21. That is, the elastic modulus of the support skeleton 11 is greater than that of the closing skeleton 21, and the closing skeleton 21 has better flexibility compared to the support skeleton 11. The stiffer support skeleton 11 provides stable support, with less deformation under stress, and is less prone to large deformation with the pulsation of the ascending aorta. The less stiff closing skeleton 21 has good flexibility and can deform closely with the pulsation of the ascending aorta, thus ensuring that the closing layer 2 always adheres tightly to the wall adjacent to the ascending aorta and the closing layer. Optionally, the stiffness of the support skeleton 11 may be uniform or non-uniform; for example, the stiffness of the support skeleton 11 at a certain part with greater blood flow impact may be less than the stiffness of other parts, in order to mitigate the impact of blood flow.

[0054] Both the supporting frame 11 and the closed frame 21 are made of metal, such as stainless steel or nickel-titanium shape memory alloy. The material of the supporting frame 11 or the closed frame 21 is selected according to the required flexibility. The first coating 22 is made of one of polyurethane, polytetrafluoroethylene, silicone, or polyester, depending on the actual needs. Of course, in other embodiments, the supporting frame 11 and the closed frame 21 can also be made of other materials, such as absorbent materials.

[0055] In this embodiment, the stent 1 further includes a second membrane 12, and at least a portion of the supporting framework 11 is covered by the second membrane 12. The second membrane 12 creates a blood flow channel within the stent 1, and a blood flow channel is formed between the stent 1 and the sealing layer 2. When blood enters the aortic stent graft, it is divided into two paths, which helps to reduce the impact of blood flow on the sealing layer 2, thereby reducing the stress transmitted from the aortic stent graft to the surrounding vessel wall caused by the blood flow impact. It can also effectively guide blood flow into the blood flow channel within the stent 1, thereby directly reducing the impact of blood flow on the ascending aortic wall and surrounding intima-patch tissue; at the same time, it can effectively guide most of the blood flow to the distal end of the aortic stent graft, increasing the proportion of blood flow in the normal lumen and increasing the blood flow supplied to the distal lumen. The second membrane 12 is made of one of polyurethane, polytetrafluoroethylene, silicone, or polyester, depending on the actual needs.

[0056] Further, as shown in Figures 9 to 20, along the axial direction of the support stent 1 and the sealing layer 2, the elastic connection layer 3 includes multiple layers of elastic skeleton 31. Each layer of elastic skeleton 31 is connected between the support stent 1 and the sealing layer 2, and adjacent layers of elastic skeleton 31 may or may not be connected. Along the axial direction of the support stent 1 and the sealing layer 2, the multiple layers of elastic skeleton 31 make the connection between the support stent 1 and the sealing layer 2 more stable. That is, the support stent 1 provides good support for the entire section of the sealing layer 2, allowing the entire section of the sealing layer 2 to undergo elastic deformation with the pulsation of the ascending aorta. This allows the entire section of the sealing layer 2 to closely adhere to the aortic vessel wall (including the intima-lamellae tissue) adjacent to the sealing layer 2 in the ascending aorta.

[0057] Specifically, each elastic skeleton 31 includes a plurality of circumferentially arranged connecting wires 311. Each connecting wire 311 is connected at both ends to the support stent 1 and the closure layer 2, respectively. Adjacent connecting wires 311 may or may not be connected. The connecting wires 311 are shape-memory metal wires, capable of bending and deforming under stress and returning to their initial state after stress is released. The circumferential arrangement of the connecting wires 311 ensures relatively uniform stress distribution on the closure layer 2 and the support stent 1. When the ascending aorta pulsates, the closure layer 2 contracts under stress or expands under elastic recovery. The connecting wires 311 elastically deform with the contraction or rebound of the closure layer 2, bending or rebounding accordingly. The connecting wires 311 not only provide good support for the closure layer 2 but also provide sufficient rebound force, allowing the closure layer 2 to rebound instantaneously. This results in better closure stability and reliability of the aortic stent graft for the ascending aorta.

[0058] Optionally, the connecting wire 311 is straight or wavy. The wavy connecting wire 311 can be formed by several V-shaped filaments or several arc-shaped filaments, and the specific form is not limited here.

[0059] Optionally, the length direction of each connecting wire 311 is consistent with or at an angle to the radial direction of the support bracket 1, and the connecting wires 311 of the upper layer elastic skeleton 31 and the connecting wires 311 of the lower layer elastic skeleton 31 can be connected or not connected, and two adjacent connecting wires 311 in the same layer can be connected or not connected, depending on the actual needs.

[0060] Example 2

[0061] This embodiment provides an aortic endovascular stent graft, which is largely the same in structure as Embodiment 1, with improvements only. Therefore, only the differences between the two will be described here, and the structures identical to those in Embodiment 1 will not be repeated.

[0062] The elastic connecting layer 3 includes a blood-coagulating material, which fills the space between the supporting stent 1 and the sealing layer 2. In this embodiment, the blood-coagulating material and the elastic skeleton 31 can be provided simultaneously or selectively. After the aortic stent graft is placed, when blood flows into the space between the supporting stent 1 and the sealing layer 2, a thrombus is formed under the action of the blood-coagulating material, sealing part or all of the space between the supporting stent 1 and the sealing layer 2. This thrombus has a certain degree of elasticity, allowing the space between the supporting stent 1 and the sealing layer 2 to be gradually filled with thrombus, forming a thrombus. The blood-coagulating material is made of fibrous filaments or is composed of thrombin, alcohol, silica powder, emulsifiers, surfactants, etc.

[0063] Alternatively, an anticoagulant material may be disposed between the stent 1 and the sealing layer 2. After the aortic stent graft is placed, when blood flows into the space between the stent 1 and the sealing layer 2, the anticoagulant material can effectively prevent blood clots from forming and entering the blood flow channels within the stent 1, or even flowing into distal blood flow cavities, causing thrombosis-related events. The anticoagulant material may be, but is not limited to, heparin. Of course, in other embodiments, an anticoagulant material, such as heparin, may be coated onto the opposing surfaces of the stent 1 and / or the sealing layer 2.

[0064] Preferably, the second cover 12 has an opening, preferably located at the distal end near the support stent 1. This allows blood flow between the support stent 1 and the sealing layer 2 to return to the support stent 1, preventing blood from accumulating and impacting the sealing layer 2 or causing thrombus formation when blood flows between the support stent 1 and the sealing layer 2 after the distal portion of the support stent 1 and the sealing layer 2 is sealed. This further improves the reliability and safety of the aortic covered stent. Of course, in other embodiments, the opening on the second cover 12 can also be located at the proximal end near the support stent 1 or at other locations, depending on actual needs; and the number and size of the openings are not limited here.

[0065] Example 3

[0066] This embodiment provides an aortic endovascular stent graft, which is largely the same in structure as Embodiment 1, with improvements only. Therefore, only the differences between the two will be described here, and the structures identical to those in Embodiment 1 will not be repeated.

[0067] In this embodiment, as shown in Figures 3 to 8, the aortic endovascular stent graft further includes an anchoring stent 4. One end of the anchoring stent 4 is inserted into or fixedly connected to one end of the supporting stent 1. The anchoring stent 4 can be anchored in the left ventricular outflow tract, aortic root, aortic prosthetic valve, aortic arch, or aortic prosthetic blood vessel or stent. By connecting the anchoring stent 4, the aortic endovascular stent graft can be further stabilized. If the dissection involves other parts of the aorta, the ascending aorta and other parts of the aorta can be treated simultaneously through the anchoring stent 4 and the aortic endovascular stent graft. It should be noted that the structures and arrangements of aortic prosthetic valves, aortic prosthetic blood vessels, or stents are relatively mature existing technologies, as are the placement of stents in the left ventricular outflow tract, aortic root, and aortic arch. Therefore, they will not be described in detail here.

[0068] For example, the anchoring stent 4 is anchored in the aortic arch. The proximal end of the anchoring stent 4 is inserted into or integrally connected to the distal end of the support frame 11. For instance, the distal end of the support frame 11 is inserted into the proximal end of the anchoring stent 4, or the proximal end of the anchoring stent 4 is inserted into the distal end of the support frame 11. The portion of the support frame 11 into which the anchoring stent 4 is inserted is a bare stent, i.e., it is not covered by the second cover 12 or the second cover 12 has an opening to allow blood flow from between the support stent 1 and the sealing layer 2. The anchoring stent 4 can be a bare stent or a covered stent, and the length of the anchoring stent 4 is set according to actual needs.

[0069] For example, the anchoring stent 4 is anchored in the left ventricular outflow tract, the aortic root, or an autologous or artificial aortic valve. The distal end of the anchoring stent 4 is inserted into or integrally connected to the proximal end of the support frame 11. For example, the proximal end of the support frame 11 is inserted into the distal end of the anchoring stent 4, or the distal end of the anchoring stent 4 is inserted into the proximal end of the support frame 11. The portion of the support frame 11 into which the anchoring stent 4 is inserted is a bare stent, i.e., it is not covered by the second covering 12 or the second covering 12 has openings to allow blood flow between the support stent 1 and the sealing layer 2. The anchoring stent 4 can be a bare stent or a covered stent, and the length of the anchoring stent 4 is set according to actual needs. Of course, the anchoring stent 4 is not limited to only one; two anchoring stents 4 can also be provided, with the two anchoring stents 4 respectively connected to both ends of the support stent 1.

[0070] Example 4

[0071] This embodiment provides an aortic endovascular stent graft, which is largely the same in structure as Embodiment 1, with improvements only. Therefore, only the differences between the two will be described here, and the structures identical to those in Embodiment 1 will not be repeated.

[0072] In this embodiment, as shown in Figures 14 to 20, each layer of elastic skeleton 31 includes at least one connecting ring 312. Two opposite points on each connecting ring 312 are connected to the support stent 1 and the sealing layer 2, respectively. Each pair of adjacent connecting rings 312 may or may not be connected. The connecting ring 312 is formed of shape memory metal wire. Optionally, the shape memory metal wire is straight or wavy. The connecting ring 312 has excellent deformation performance. When the ascending aorta contracts, the sealing layer 2 contracts under force and transmits the force to the connecting ring 312. The connecting ring 312 deforms under force, converting most of the force into deformation, while the remaining small portion of the force is transmitted to the support stent 1. That is, the support stent 1 experiences less force with the pulsation of the ascending aorta, making it less prone to large deformation and displacement, thus ensuring the stability of the aortic stent graft. Furthermore, the deformation path of the connecting ring 312 under force is basically stable; that is, the connecting ring 312 deforms along its radial direction, effectively avoiding interference caused by axial deformation of each layer of elastic skeleton 31. Simultaneously, the connecting ring 312 can quickly rebound after the force is released.

[0073] For example, each connecting ring 312 is located between the support stent 1 and the sealing layer 2, that is, the support stent 1 and the connecting ring 312 are adjacent to each other and do not overlap in space; or the support stent 1 is located within each connecting ring 312, and most of the force applied by the sealing layer 2 is absorbed and converted by the connecting ring 312, and very little of it is transmitted to the support stent 1, so that the support stent 1 has better stability, thereby ensuring the stability of the aortic endovascular stent graft.

[0074] Optionally, the radial direction of the connecting ring 312 of each layer of elastic skeleton 31 can be consistent with the radial direction of the support bracket 1, or it can be set at an angle. That is, the connecting ring 312 is set at an angle relative to the support bracket 1 and the closing layer 2, and the tilt direction of the connecting ring 312 of the upper layer of elastic skeleton 31 and the connecting ring 312 of the lower layer of elastic skeleton 31 can be the same or different, and the connecting ring 312 of the upper layer of elastic skeleton 31 and the connecting ring 312 of the lower layer of elastic skeleton 31 can be connected or not connected, depending on the actual needs. For example, when the connecting ring 312 of the upper layer of elastic skeleton 31 and the connecting ring 312 of the lower layer of elastic skeleton 31 are connected, and the radial directions of the connecting ring 312 of the upper layer of elastic skeleton 31 and the connecting ring 312 of the lower layer of elastic skeleton 31 are set at an angle, one connecting ring 312 of the upper layer of elastic skeleton 31 and one connecting ring 312 of the lower layer of elastic skeleton 31 form a non-planar "8" shape.

[0075] Optionally, the two adjacent connecting rings 312 of each layer of elastic skeleton 31 can be connected to each other or not connected, depending on the actual needs.

[0076] Example 5

[0077] This embodiment provides an aortic endovascular stent graft, which is largely the same in structure as Embodiment 1, with improvements only. Therefore, only the differences between the two will be described here, and the structures identical to those in Embodiment 1 will not be repeated.

[0078] In this embodiment, several layers of elastic skeleton 31 include a plurality of connecting wires 311 arranged in a ring, and several other layers of elastic skeleton 31 include connecting rings 312. The structure and arrangement of the connecting wires 311 are the same as in Embodiment 1, and the structure and arrangement of the connecting rings 312 are the same as in Embodiment 4.

[0079] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An aortic endovascular stent graft, characterized in that, include: Support bracket; A sealing layer is spaced out and sleeved around the outer periphery of the support bracket, the sealing layer including a first film; An elastic connecting layer is provided between the support frame and the sealing layer, allowing blood flow between the support frame and the sealing layer; As the aorta pulsates, the sealing layer and the elastic connecting layer undergo elastic deformation to ensure that the first covering membrane always adheres tightly to the vessel wall of the aorta adjacent to the sealing layer.

2. The aortic endovascular stent graft according to claim 1, characterized in that, The sealing layer also includes a sealing skeleton, and the first coating covers the sealing skeleton.

3. The aortic endovascular stent graft according to claim 1, characterized in that, Along the axial direction of the support bracket and the sealing layer, the elastic connection layer includes multiple layers of elastic skeletons, each layer of the elastic skeleton is connected between the support bracket and the sealing layer, and each adjacent two layers of the elastic skeleton are connected or not connected.

4. The aortic endovascular stent graft according to claim 3, characterized in that, Each layer of the elastic skeleton includes a plurality of connecting wires arranged in a ring. The two ends of each connecting wire are respectively connected to the support bracket and the sealing layer. Each pair of adjacent connecting wires may or may not be connected.

5. The aortic endovascular stent graft according to claim 4, characterized in that, The connecting wire is either straight or wavy.

6. The aortic endovascular stent graft according to claim 3, characterized in that, Each layer of the elastic skeleton includes at least one connecting ring, with two opposite points on each connecting ring connected to the support bracket and the closing layer respectively, and each pair of adjacent connecting rings may or may not be connected.

7. The aortic endovascular stent graft according to any one of claims 1-6, characterized in that, The support frame includes a support skeleton, at least a portion of which is covered with a second film, the second film having openings or no openings.

8. The aortic endovascular stent graft according to any one of claims 1-6, characterized in that, The elastic connection layer includes a blood-coagulating material, which is filled between the support frame and the sealing layer; Alternatively, an anti-condensation material may be provided between the support bracket and the sealing layer.

9. The aortic endovascular stent graft according to any one of claims 1-6, characterized in that, The support bracket and the sealing layer are coaxial.

10. The aortic endovascular stent graft according to any one of claims 1-6, characterized in that, It also includes an anchoring stent, one end of which is inserted into or fixedly connected to one end of the supporting stent. The anchoring stent can be anchored in the left ventricular outflow tract, the aortic root, the aortic artificial valve, the aortic arch, or an artificial blood vessel or stent in the aorta.

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