Aortic stent graft

Abstract

The present application relates to cardiovascular disease medical equipment technical field, disclose a kind of aortic covered stent, the aortic covered stent includes support stent, closure layer and elastic connecting layer, closure layer is spaced apart and is set to the outer periphery of support stent, closure layer includes first covering, elastic connecting layer is connected between support stent and closure layer, blood flow can flow between support stent and closure layer;With aortic pulsation, closure layer and elastic connecting layer produce elastic deformation, so that first covering is always close to aortic and the blood vessel wall adjacent to closure layer.The aortic covered stent can be better applied to the special form of ascending aortic dissection and the mechanical characteristics of blood flow, higher stability, better closure for ascending aortic wall.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cardiovascular disease medical equipment, and particularly relates to an aortic covered stent. BACKGROUND

[0002] Based on the current technology, for the dissection involving ascending aorta, most treatments are surgical operation, that is, for the involved ascending aorta segment, a surgical artificial blood vessel is replaced. However, the operation is large, anastomosis is difficult, the operation needs extracorporeal circulation, and the trauma is large, and the complications are many. Based on the above problems, there is also an interventional treatment for the ascending aorta, but due to the particularity of the ascending aorta dissection, such as the large shape change of the ascending aorta when the heart beats, the short ascending aorta or the lack of anchoring zone of the ascending aorta caused by the dissection involving the ascending aorta, the short distance between the ascending aorta lesion and the coronary artery opening and the aortic valve, and the dissection involving the supra-aortic branch, the existing conventional aortic stent is often difficult to be applied to the ascending aorta dissection.

[0003] Therefore, there is an urgent need for an aortic covered stent to solve the above problems. SUMMARY

[0004] Based on the above, the purpose of the present application is to provide an aortic covered stent which can be better applied to the special shape and mechanical characteristics of blood flow of the ascending aorta dissection, has high stability, and has better sealing property to the aortic wall.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] An aortic covered stent comprises:

[0007] a support stent;

[0008] a sealing layer which is sleeved on the outer periphery of the support stent, the sealing layer comprising a first covering membrane;

[0009] an elastic connecting layer which is connected between the support stent and the sealing layer, and blood flow can flow between the support stent and the sealing layer;

[0010] With the pulsation of the aorta, the sealing layer and the elastic connecting layer produce elastic deformation, so that the first covering membrane always closely adheres to the wall of the aorta adjacent to the sealing layer.

[0011] As a preferred scheme of the aortic covered stent, the sealing layer further comprises a sealing framework, and the first covering membrane is coated on the sealing framework.

[0012] As a preferred solution of the aortic covered stent, the elastic connecting layer comprises a plurality of elastic frameworks in the axial direction of the support stent and the closing layer, each of the elastic frameworks is connected between the support stent and the closing layer, and each two adjacent elastic frameworks are connected or not connected.

[0013] As a preferred solution of the aortic covered stent, each of the elastic frameworks comprises a plurality of connecting wires arranged in a ring, each of the connecting wires is connected to the support stent and the closing layer at two ends, and each two adjacent connecting wires are connected or not connected.

[0014] As a preferred solution of the aortic covered stent, the connecting wires are in a straight line or a wave shape.

[0015] As a preferred solution of the aortic covered stent, each of the elastic frameworks comprises at least one connecting ring, and each of the connecting rings is connected to the support stent and the closing layer at two opposite points, and each two adjacent connecting rings are connected or not connected.

[0016] As a preferred solution of the aortic covered stent, the support stent comprises a support framework, at least part of the support framework is covered with a second covering film, and the second covering film is provided with an opening or not provided with an opening.

[0017] As a preferred solution of the aortic covered stent, the elastic connecting layer comprises blood coagulation materials filled between the support stent and the closing layer.

[0018] Or the support stent and the closing layer are provided with an anticoagulant material.

[0019] As a preferred solution of the aortic covered stent, the support stent and the closing layer are coaxial.

[0020] As a preferred solution of the aortic covered stent, the aortic covered stent further comprises an anchor stent, one end of the anchor stent is inserted or fixedly connected to one end of the support stent, and the anchor stent can be anchored in the left ventricular outflow tract, the aortic root, the aortic valve, the aortic arch, the artificial blood vessel or the stent of the aorta.

[0021] The aortic covered stent has the following beneficial effects:

[0022] The present application provides an aortic covered stent, which comprises a support stent, a sealing layer and an elastic connecting layer. The support stent provides stable support so that the aortic covered stent can remain relatively stable under the complex blood flow environment of the ascending aorta and does not swing or shift seriously with the blood flow. When the aorta pulsates, the elastic connecting layer and the sealing layer elastically deform, contract or expand with the aorta, so that the sealing layer always adheres to the adjacent blood vessel wall of the aorta, i.e. seals the aortic dissection rupture, reduces or avoids the blood flow from entering the false lumen through the aortic rupture, and effectively avoids the sealing layer from causing damage to the fragile aortic wall, especially the intimal tissue around the rupture. At the same time, when the blood flow passes through the aortic covered stent, it is shunted, part of which enters between the support stent and the sealing layer, which can not only ensure that the sealing layer has enough space and stress environment to contract and expand with the ascending aorta, but also slow down the impact of the blood flow on the sealing layer, thereby reducing the force transmitted to the adjacent blood vessel wall (especially the fragile intimal tissue) by the sealing layer due to the impact of the blood flow, and reducing the lateral impact of the blood flow on the covered stent when the blood flow travels along the axial direction of the blood vessel, thereby reducing the influence of the blood flow on the stability of the covered stent. The aortic covered stent has high adaptability to the ascending aorta which has large morphological variation when pulsating, and can be well applied to the special morphology of the ascending aortic dissection and the mechanical characteristics of the blood flow. Compared with the existing aortic covered stent, the stress on the aortic wall and the intimal flap is smaller, which can effectively reduce the damage of the aortic covered stent to the aortic wall. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and the drawings.

[0024] Figure 1 is a structural schematic diagram of the support stent and the sealing layer provided by the embodiments of the present application;

[0025] Figure 2 is a structural schematic diagram of the support skeleton and the sealing skeleton provided by the embodiments of the present application Figure 1 ;

[0026] Figure 3 is a structural schematic diagram of the aortic covered stent provided by the embodiments of the present application, in which the anchor stent is connected to the distal end of the support stent Figure 1 ;

[0027] Figure 4 is a structural schematic diagram of the aortic covered stent provided by the embodiments of the present application, in which the anchor stent is connected to the proximal end of the support stentFigure 1 ;

[0028] Figure 5 is a structural diagram of a support skeleton and a closed skeleton provided by an embodiment of the present application Figure 2 ;

[0029] Figure 6 is a structural diagram of an aortic covered stent to which an anchoring stent is connected at the distal end of a support stent provided by an embodiment of the present application Figure 2 ;

[0030] Figure 7 is a structural diagram of a support skeleton and a closed skeleton provided by an embodiment of the present application Figure 3 ;

[0031] Figure 8 is a structural diagram of an aortic covered stent to which an anchoring stent is connected at the proximal end of a support stent provided by an embodiment of the present application Figure 3 ;

[0032] Figure 9 is a top view of an aortic covered stent provided by an embodiment one of the present application Figure 1 (an anchoring stent is not shown);

[0033] Figure 10 is a top view of an aortic covered stent provided by an embodiment one of the present application Figure 2 (an anchoring stent is not shown);

[0034] Figure 11 is a top view of an aortic covered stent provided by an embodiment one of the present application Figure 3 (an anchoring stent is not shown);

[0035] Figure 12 is a top view of an aortic covered stent provided by an embodiment one of the present application Figure 4 (an anchoring stent is not shown);

[0036] Figure 13 is a top view of an aortic covered stent provided by an embodiment one of the present application Figure 5 (an anchoring stent is not shown);

[0037] Figure 14 is a top view of an aortic covered stent provided by an embodiment four of the present application Figure 1 (an anchoring stent is not shown);

[0038] Figure 15 is a top view of an aortic covered stent provided by an embodiment four of the present application Figure 2 (an anchoring stent is not shown);

[0039] Figure 16 is a top view of an aortic covered stent provided by an embodiment four of the present application Figure 3(not shown)

[0040] Figure 17 is a cross section of an aortic stent-graft provided by an embodiment of the present application Figure 1 (not shown)

[0041] Figure 18 is a cross section of an aortic stent-graft provided by an embodiment of the present application Figure 2 (not shown)

[0042] Figure 19 is a cross section of an aortic stent-graft provided by an embodiment of the present application Figure 3 (not shown)

[0043] Figure 20 is a cross section of an aortic stent-graft provided by an embodiment of the present application Figure 4 (not shown)

[0044] In the drawings:

[0045] 1, support stent; 11, support skeleton; 12, second stent-graft; 2, sealing layer; 21, sealing skeleton; 22, first stent-graft; 3, elastic connecting layer; 31, elastic skeleton; 311, connecting wire; 312, connecting ring; 4, anchoring stent. DETAILED DESCRIPTION

[0046] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the present application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0047] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0049] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0050] Embodiment one

[0051] As Figures 1 to 20As shown, the present embodiment provides an aortic covered stent, which can be applicable to the treatment of the whole aorta, especially the ascending aorta. Specifically, the aortic covered stent comprises a support stent 1, a closure layer 2 and an elastic connecting layer 3. The closure layer 2 is sleeved on the outer periphery of the support stent 1, and the closure layer 2 comprises a first covering membrane 22. The elastic connecting layer 3 is connected between the support stent 1 and the closure layer 2. Blood flow can flow between the support stent 1 and the closure layer 2. With the pulsation of the aorta, the closure layer 2 and the elastic connecting layer 3 produce elastic deformation, so that the closure layer 2 always adheres to the blood vessel wall adjacent to the closure layer of the aorta. Taking the aortic covered stent applicable to the ascending aorta as an example, the stable support effect of the support stent 1 enables the aortic covered stent to be stable in the ascending aorta under complex blood flow environment. When the ascending aorta pulsates, the elastic connecting layer 3 and the closure layer 2 produce elastic deformation, contract or expand with the ascending aorta, so that the closure layer 2 always adheres to the wall adjacent to the closure layer of the ascending aorta (including the normal ascending aorta blood vessel wall and the torn intimal flap tissue), that is, the intimal rupture of the ascending aorta can be closed, avoiding or reducing the blood flow entering the false lumen through the aortic rupture, and effectively avoiding the damage of the closure layer 2 to the fragile ascending aorta, especially the torn intimal flap tissue. At the same time, when the blood flow passes through the aortic covered stent, it is shunted, part of which enters between the support stent 1 and the closure layer 2, which can not only ensure that the closure layer 2 has enough space and stress environment to contract and expand with the ascending aorta, but also slow down the impact of blood flow on the closure layer 2, thereby reducing the force transmitted to the adjacent blood vessel wall (especially the fragile intimal flap tissue) by the closure layer 2 due to the impact of blood flow, and also reducing the lateral impact of blood flow on the aortic covered stent when the blood flow travels along the blood vessel axis, thereby reducing the influence of blood flow on the stability of the aortic covered stent. The aortic covered stent has high adaptability to the ascending aorta which has large morphological variation during pulsation, and can be better applicable to the special morphology of the ascending aorta dissection and the mechanical characteristics of the blood flow. Compared with the existing aortic stent, the stress of the aortic covered stent on the ascending aorta blood vessel wall and the intimal flap is smaller, which can effectively reduce the damage of the aortic covered stent to the ascending aorta blood vessel wall.

[0052] Optionally, the closure layer 2 further comprises a closure framework 21, and the first covering membrane 22 is wrapped on the closure framework 21. That is, the elastic connecting layer 3 can be connected between the closure framework 21 and the support stent 1, or the first covering membrane 22 can be directly sleeved outside the elastic connecting layer 3.

[0053] Preferably, the support stent 1 and the closed layer 2 are coaxial. Exemplarily, the support stent 1 is cylindrical, the closed layer 2 is cylindrical, and the cross sections of the support stent 1 and the closed layer 2 are two concentric circles. The coaxial arrangement of the support stent 1 and the closed layer 2 makes the circumferential stress of the support stent 1 and the closed layer 2 more uniform, and also makes the stress of the ascending aortic wall more uniform, avoiding damage caused by excessive stress at some places of the ascending aorta. Of course, in other embodiments, the support stent 1 and the closed layer 2 can also be arranged non-coaxially, according to actual needs.

[0054] Specifically, as shown in Figure 1 and Figure 2 , the support stent 1 includes a support framework 11, and the rigidity of the support framework 11 is greater than that of the closed framework 21. That is, the elastic modulus of the support framework 11 is greater than that of the closed framework 21, and the closed framework 21 has better flexibility than the support framework 11. The support framework 11 with greater rigidity can provide stable support and has smaller stress deformation, and is not easy to produce large deformation with the pulsation of the ascending aorta. The closed framework 21 with smaller rigidity has good flexibility, can deform with the pulsation of the ascending aorta, and thus the closed layer 2 can always closely adhere to the wall adjacent to the closed layer of the ascending aorta. Optionally, the rigidity of the support framework 11 itself is uniform or non-uniform, for example, the rigidity of the support framework 11 at a certain position corresponding to a larger blood flow impact is smaller than that at other positions, so as to alleviate the impact of the blood flow.

[0055] , the support framework 11 and the closed framework 21 are made of metal, for example, technical materials such as stainless steel or nickel-titanium memory alloy, and the support framework 11 or the closed framework 21 is made of a material selected according to the required flexibility; the first covering film 22 is made of one of polyurethane, polytetrafluoroethylene, silicone, and polyester, and is set according to actual needs. Of course, in other embodiments, the support framework 11 and the closed framework 21 can also be made of other materials, such as absorbable materials.

[0056] In this embodiment, the support stent 1 further includes a second covering film 12, and at least part of the support framework 11 is covered with the second covering film 12. The second covering film 12 forms a blood flow channel in the support stent 1, and a blood flow channel between the support stent 1 and the closed layer 2. When the blood flow enters the aortic covered stent, it is divided into two paths, which is conducive to reducing the impact of the blood flow on the closed layer 2, thereby reducing the stress conducted to the surrounding blood vessel wall from the aortic covered stent by the blood flow impact, and directly reducing the impact of the blood flow on the ascending aortic wall and the surrounding endometrial tissue by effectively guiding the blood flow into the blood flow channel in the support stent 1; at the same time, most of the blood flow can be effectively guided to the distal end of the aortic covered stent, increasing the proportion of blood flow in the normal lumen and increasing the blood flow supplied by the distal lumen. The second covering film 12 is made of one of polyurethane, polytetrafluoroethylene, silicone, and polyester, and is set according to actual needs.

[0057] Furthermore, such as Figures 9 to 20 As shown, along the axial direction of the supporting 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 supporting 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 supporting stent 1 and the sealing layer 2, the multiple layers of elastic skeleton 31 make the connection between the supporting stent 1 and the sealing layer 2 relatively stable. That is, the supporting 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) adjacent to the sealing layer 2 in the ascending aorta.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Example 2

[0062] 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.

[0063] The elastic connecting layer 3 comprises blood coagulation material filled between the support stent 1 and the closing layer 2. In this embodiment, the blood coagulation material can be provided simultaneously with the elastic framework 31 or alternatively. After the aortic covered stent is put in, when the blood flows into the space between the support stent 1 and the closing layer 2, the blood coagulation material can form a blood clot to seal part or all of the space between the support stent 1 and the closing layer 2, and has a certain elasticity, so as to gradually fill the space between the support stent 1 and the closing layer 2 with the blood clot, and form thrombosis. The blood coagulation material can be a fiber or made of thrombin, alcohol, silica powder, emulsifier, surfactant, etc.

[0064] Alternatively, an anticoagulant material can be provided between the support stent 1 and the closing layer 2. After the aortic covered stent is put in, when the blood flows into the space between the support stent 1 and the closing layer 2, the anticoagulant material can effectively prevent the blood flow from forming a blood clot to enter the blood flow channel in the support stent 1, or even flow into the distal blood flow cavity, causing thrombus-related events. The anticoagulant material can be heparin, but is not limited to heparin. Of course, in other embodiments, the anticoagulant material, such as heparin, can be coated on the opposite surface of the support stent 1 and / or the closing layer 2.

[0065] Preferably, the second covering 12 is provided with an opening, preferably near the distal end of the support stent 1, so that the blood flow between the support stent 1 and the closing layer 2 can flow back into the support stent 1, avoiding the impact of the blood flow on the closing layer 2 or the thrombus when the blood flow flows between the support stent 1 and the closing layer 2 after the part near the distal end of the support stent 1 and the closing layer 2 is sealed, thereby further improving the use reliability and safety of the aortic covered stent. Of course, in other embodiments, the opening on the second covering 12 can also be provided near the proximal end of the support stent 1 or other parts, and the number and size of the opening are not limited herein.

[0066] Embodiment Three

[0067] This embodiment provides an aortic covered stent which is substantially the same as the structure of embodiment one, and only improves the structure of embodiment one. Therefore, only the differences between the two embodiments are described herein, and the same structure of this embodiment and embodiment one is not described herein.

[0068] In this embodiment, as Figures 3 to 8As shown, the aortic covered stent further comprises an anchoring stent 4, one end of the anchoring stent 4 is inserted or fixedly connected with one end of the supporting stent 1, and the anchoring stent 4 can be anchored in the left ventricular outflow tract, the aortic root, the aortic artificial valve, the aortic arch, the artificial blood vessel or the stent of the aorta. By connecting the anchoring stent 4, the aortic covered stent can be further stabilized, and if the dissection involves other parts of the aorta, the ascending aorta and other parts of the aorta can be treated synchronously through the anchoring stent 4 and the aortic covered stent. It should be noted that the structures and arrangement modes of the aortic artificial valve, the artificial blood vessel or the stent of the aorta and the like are relatively mature existing technologies, and the setting of the stent at the left ventricular outflow tract, the aortic root and the aortic arch is also relatively mature existing technology, so it is not described here.

[0069] Exemplarily, the anchoring stent 4 is anchored in the aortic arch, the proximal end of the anchoring stent 4 is inserted or integrally connected with the distal end of the supporting skeleton 11, for example, the distal end of the supporting skeleton 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 supporting skeleton 11, and the part of the supporting skeleton 11 inserted into the anchoring stent 4 is a bare stent, that is, the second covering membrane 12 is not covered or the second covering membrane 12 is provided with an opening, so as to facilitate the blood flow out of the space between the supporting stent 1 and the sealing layer 2. Among them, 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.

[0070] Exemplarily, the anchoring stent 4 is anchored in the left ventricular outflow tract, the aortic root, the aortic autologous or artificial valve, the distal end of the anchoring stent 4 is inserted or integrally connected with the proximal end of the supporting skeleton 11, for example, the proximal end of the supporting skeleton 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 supporting skeleton 11, and the part of the supporting skeleton 11 inserted into the anchoring stent 4 is a bare stent, that is, the second covering membrane 12 is not covered or the second covering membrane 12 is provided with an opening, so as to facilitate the blood flow into the space between the supporting stent 1 and the sealing layer 2. Among them, 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, and the anchoring stent 4 can also be provided with two, and the two anchoring stents 4 are respectively connected at the two ends of the supporting stent 1.

[0071] Embodiment Four

[0072] The present embodiment provides an aortic covered stent, which is substantially the same as the structure of embodiment one, and only improves on the basis of embodiment one. Therefore, only the differences between the two are described here, and the same structure of the present embodiment and embodiment one is not described here.

[0073] In the present embodiment, as shown in Figures 14 to 20As shown, each elastic framework 31 comprises at least one connecting ring 312, and opposite two points on each connecting ring 312 are connected with the support stent 1 and the closure layer 2 respectively, and each adjacent two connecting rings 312 are connected or not connected. The connecting ring 312 is formed by a memory wire. Optionally, the memory wire is in a straight line or a wave shape. The connecting ring 312 has a better deformation performance. When the ascending aorta contracts, the closure layer 2 is forced to contract and transmits the force to the connecting ring 312. The connecting ring 312 is deformed by the force and converts most of the force into deformation. The remaining small part of the force is transmitted to the support stent 1, that is, the support stent 1 is less likely to produce a larger deformation and displacement under the force of the ascending aorta pulsation, thereby ensuring the stability of the aortic covered stent. When the connecting ring 312 is deformed, the deformation path is basically stable, that is, the connecting ring 312 is compressed or expanded in the radial direction when it is deformed, which can effectively avoid the interference of the elastic framework 31 of each layer in the axial direction, and the connecting ring 312 can quickly rebound after unloading.

[0074] Exemplarily, each connecting ring 312 is located between the support stent 1 and the closure layer 2, that is, the support stent 1 and the connecting ring 312 are connected adjacent to each other without overlapping in space; or the support stent 1 is located in each connecting ring 312, and most of the force applied by the closure layer 2 is absorbed and converted by the connecting ring 312, and only a small part of the force is transmitted to the support stent 1, so that the stability of the support stent 1 is better, thereby ensuring the stability of the aortic covered stent.

[0075] Optionally, the radial direction of the connecting ring 312 of each elastic framework 31 can be consistent with the radial direction of the support stent 1, or can be arranged at an angle, that is, the connecting ring 312 is arranged obliquely compared with the support stent 1 and the closure layer 2, and the oblique directions of the connecting ring 312 of the upper elastic framework 31 and the connecting ring 312 of the lower elastic framework 31 can be consistent or inconsistent, and the connecting ring 312 of the upper elastic framework 31 and the connecting ring 312 of the lower elastic framework 31 can be connected or not connected, which is specifically set according to actual needs. For example, when the connecting ring 312 of the upper elastic framework 31 and the connecting ring 312 of the lower elastic framework 31 are connected, and the radial directions of the connecting ring 312 of the upper elastic framework 31 and the connecting ring 312 of the lower elastic framework 31 are arranged at an angle, one connecting ring 312 of the upper elastic framework 31 and one connecting ring 312 of the lower elastic framework 31 form a non-planar "8" shape.

[0076] Optionally, each adjacent two connecting rings 312 of each elastic framework 31 can be connected or not connected, which is specifically set according to actual needs.

[0077] Embodiment five

[0078] The present embodiment provides an aortic covered stent which is substantially the same as the structure of the first embodiment, only improved on the basis of the first embodiment. Therefore, only the differences between the two are described, and the same structure of the present embodiment and the first embodiment is not described again.

[0079] In the present embodiment, the elastic skeletons 31 of several layers include a plurality of connecting wires 311 arranged in a ring, and the elastic skeletons 31 of several other layers include connecting rings 312. The structure and arrangement of the connecting wires 311 are the same as those of the first embodiment, and the structure and arrangement of the connecting rings 312 are the same as those of the fourth embodiment.

[0080] Note that the above are only the preferred embodiments of the present application and the principles of the applied technology. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An aortic covered stent, characterized by, The application relates to aortic stent grafts. The aortic stent graft comprises a support stent, a closed layer and an elastic connecting layer. The closed layer is sleeved on the outer periphery of the support stent and comprises a first covering film and a closed stent. The support stent has a larger rigidity than the closed stent. The elastic connecting layer is connected between the support stent and the closed layer, and blood flow can pass between the support stent and the closed layer. The closed layer and the elastic connecting layer are elastically deformed with the pulsation of the aorta, so that the first covering film is always tightly attached to the blood vessel wall adjacent to the closed layer of the aorta. In the axial direction of the support stent and the closed layer, the elastic connecting layer comprises a plurality of elastic stents, each of which is connected between the support stent and the closed layer. Each elastic stent comprises a plurality of connecting wires arranged in a ring, and each connecting wire is connected to the support stent and the closed layer at two ends.

2. The aortic covered stent of claim 1, wherein, Each elastic stent comprises at least one connecting ring, and each connecting ring is connected to the support stent and the closed layer at two opposite points.

3. The aortic covered stent of claim 1, wherein, The connecting wire is in a straight line or a wave shape.

4. The aortic stent graft according to any one of claims 1-3, wherein, The support stent comprises a support stent, and at least part of the support stent is covered with a second covering film.

5. The aortic stent graft according to any one of claims 1-3, wherein, The elastic connecting layer comprises blood coagulation materials filled between the support stent and the closed layer. The support stent and the closed layer are coaxial.

6. The aortic stent graft according to any one of claims 1-3, wherein, The aortic stent graft further comprises an anchor stent, one end of the anchor stent is connected to one end of the support stent, and the anchor stent can be anchored in the artificial blood vessel or stent of the aorta, the left ventricular outflow tract, the aortic root, the aortic artificial valve and the aortic arch.

7. The aortic stent graft according to any one of claims 1-3, wherein, The aortic stent graft further comprises an anchor stent, one end of the anchor stent is fixedly connected to one end of the support stent, and the anchor stent can be anchored in the artificial blood vessel or stent of the aorta, the left ventricular outflow tract, the aortic root, the aortic artificial valve and the aortic arch.

8. The aortic stent graft according to any one of claims 1-3, wherein, ​

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