Artery blood vessel wall reinforcing and protecting device

Abstract

The utility model belongs to the field of implantation and intervention medical instruments, and provides an artery blood vessel wall reinforcing and protecting device which comprises at least two single-layer tubular flow forming parts with hollowed-out side walls, the tubular flow forming parts can be mutually nested along the axial length direction, and a nested stent is formed when the tubular flow forming parts are mutually nested; the nested stent comprises a sparse section and a dense section, and the grid spacing of the sparse section is greater than the grid spacing of the dense section; the dense section is formed at at least one end of the nested stent, and the sparse section is adjacent to the dense section and at least formed in the middle of the nested stent. The arterial blood vessel wall reinforcing and protecting device can reinforce the arterial blood vessel wall to achieve a prevention effect and can also achieve an effect of treating dissected aneurysm.

Description

Technical Field

[0001] The utility model belongs to the field of implantable medical devices, and in particular relates to an arterial blood vessel wall reinforcement and protection device. Background Art

[0002] With the change of dietary structure, the aging of population and the progress of diagnosis and treatment technology, the diseases caused by the reduction of aortic wall elasticity are still showing an upward trend year by year, and seriously endanger the life and health of patients. The annual incidence of aortic dissection caused by weak arterial wall is 5-30 / 1 million population, which is one of the main causes of sudden death. It has an acute onset and great harm. It can tear the weak blood vessel wall, form an aneurysm or directly rupture and cause massive bleeding and death. After the aortic dissection is formed, the true lumen is compressed, which can affect the blood supply of important branches of the aorta, causing serious ischemic necrosis of important organs, causing serious complications such as myocardial infarction and cerebral infarction or even death. Therefore, it is particularly important to prevent diseases such as dissection caused by reduced arterial wall elasticity. However, the current treatment methods are all for aortic wall dissection and aneurysm caused by reduced vascular wall elasticity. After the occurrence of vascular repair surgery, patients still need to receive corresponding treatment after surgery, and have not really prevented it from the source.

[0003] In addition, the traditional aortic stent graft is composed of multiple stent rings connected by externally applied or sutured fabrics or films. Some stents will add longitudinal metal wires to improve longitudinal stability. Its biggest disadvantage is that when encountering curved blood vessels, the straight stent will bend, and this bending is concentrated between the rings of the stent, rather than evenly distributed. In this way, local bending will lead to poor blood flow in the cavity and poor adhesion of the stent, causing the "bird beak phenomenon" of the aortic arch stent (the stent on the large curve side is attached to the wall and the small curve side is tilted) and Kink in the twisted part of the stent, and even due to the longitudinal stiffness of the stent, the friction between the head end and the tube wall may damage the tube wall or the stent may shift. Therefore, it is necessary to develop a new intraluminal graft system to solve this problem.

[0004] Endovascular exclusion with covered stents requires that a certain length of aneurysm neck (i.e., normal arterial segment) must be maintained in the treatment of dissection or aneurysm to ensure a sufficiently long anchoring zone. If the starting point of the lesion involves important branch arteries, for example, if the dissection or aneurysm occurs in the aortic arch, close to the bilateral renal arteries, or involves the superior mesenteric artery, the use of covered stents will inevitably block these important arteries, limiting the application of covered stents. At present, fenestrated covered stents and branched covered stents are gradually being developed and applied, but both types of stents must be customized before surgery, which is difficult to operate, and to a certain extent limits their promotion and use. The chimney technology simplifies the operation process, but there is still a risk of internal leakage caused by insufficient fit between the main body and the branch. This technology is to place a covered stent with a fenestration or branch into the dilated aorta, and use a small-diameter covered stent through the fenestration or branch stent to maintain the blood supply of the branch artery, so as to isolate the aneurysm while keeping the branch artery patency. However, the results are still uncertain, the technology is complex, the anatomical conditions of the patient's blood vessels are high, there are many serious complications such as loss of important organs and paraplegia, the design and manufacture of the equipment are limited, and the customization time of the stent is long. Although it brings hope for the full intracavitary treatment of aortic dilatation disease, it is still under exploration, and even the above technologies cannot completely solve the problems faced. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an arterial blood vessel wall reinforcement and protection device.

[0006] An arterial blood vessel wall reinforcement and protection device comprises at least two single-layer tubular flow-forming members with hollow side walls, wherein the tubular flow-forming members can be mutually overlapped along the axial length direction, and when the tubular flow-forming members are mutually overlapped, a nested stent is formed; the nested stent comprises a sparse segment and a dense segment, and the grid spacing of the sparse segment is greater than the grid spacing of the dense segment; the dense segment is formed at at least one end of the nested stent, and the sparse segment is adjacent to the dense segment and is formed at least in the middle of the nested stent.

[0007] In some embodiments, the tubular flow forming member is configured into two, and the two tubular flow forming members have equal lengths and are both grid-shaped. One of the tubular flow forming members is configured as the inner stent of the nested stent, and the other tubular flow forming member is configured as the outer stent of the nested stent. The inner stent includes a dense section with a first grid spacing and a sparse section with a second grid spacing, and the second grid spacing is greater than the first grid spacing. The dense sections are located on both sides of the sparse section, and the grid spacing of the outer stent is greater than the first grid spacing. The nested stent has a sparse section and two dense sections. The two dense sections are respectively formed at the two ends of the nested stent. The sparse section is adapted to be arranged in the arterial blood vessel of the aortic arch segment, one of the dense sections is adapted to be arranged in the arterial blood vessel of the ascending aorta segment, and the other dense section is adapted to be arranged in the arterial blood vessel of the descending aorta segment. Optionally, the grid spacing of the outer stent is equal to the second grid spacing.

[0008] In some embodiments, the tubular flow forming member is configured into two, and the two tubular flow forming members have unequal lengths and are both grid-shaped. The shorter one of the tubular flow forming members is configured as the outer stent of the nested stent, and the longer tubular flow forming member is configured as the inner stent of the nested stent; the grid spacing of the inner stent is greater than the grid spacing of the outer stent; the nested stent has a sparse section and a dense section, and the dense section includes the outer stent. The dense section is adapted to be arranged in the arterial blood vessel of the ascending aorta segment, and the sparse section is adapted to be arranged in the arterial blood vessels of the aortic arch segment and the descending aorta segment.

[0009] In some embodiments, the tubular flow forming member is configured into two, and the two tubular flow forming members have equal lengths and are both spiral-shaped. The spiral directions of the two tubular flow forming members are opposite; one of the tubular flow forming members is configured as the inner stent of the nested stent, and the other tubular flow forming member is configured as the outer stent of the nested stent; the inner stent and the outer stent respectively include a dense section with a first pitch and a sparse section with a second pitch, and the second pitch is greater than the first pitch. The dense sections are located on both sides of the sparse section; the nested stent has a sparse section and two dense sections. The two dense sections are respectively formed at the two ends of the nested stent. The sparse section is adapted to be arranged in the arterial blood vessel of the aortic arch segment, one of the dense sections is adapted to be arranged in the arterial blood vessel of the ascending aorta segment, and the other dense section is adapted to be arranged in the arterial blood vessel of the descending aorta segment.

[0010] In some embodiments, the tubular flow shaper is constructed into two, the two tubular flow shapers are of unequal lengths and are both spiral, and the spiral directions of the two tubular flow shapers are opposite; the shorter tubular flow shaper is constructed as the outer stent of the nested stent, and the longer tubular flow shaper is constructed as the inner stent of the nested stent; the pitch of the inner stent is greater than the pitch of the outer stent; the nested stent has a sparse segment and a dense segment, the dense segment includes the outer stent, the dense segment is suitable for being arranged in the arterial blood vessel of the ascending aorta segment, and the sparse segment is suitable for being arranged in the arterial blood vessel of the aortic arch segment and the descending aorta segment.

[0011] In some embodiments, the arterial vessel wall reinforcement and protection device is used for an aorta, and at least one of the tubular flow shaping members has an anchoring barb at its proximal end. The anchoring barb is inclined toward the outside of each tubular flow shaping member, and the angle between the anchoring barb and the central axis of each tubular flow shaping member is 20-70 degrees. The length of the anchoring barb is 1-4 mm.

[0012] In some embodiments, the proximal end of the outer stent is provided with a plurality of circles of anchoring thorns. Preferably, the outer surface of the tubular flow shaping member is coated with an anticoagulant coating.

[0013] The features and advantages of the utility model include: the arterial blood vessel wall reinforcement and protection device provided by the utility model can not only reinforce the arterial blood vessel wall to achieve a preventive effect, but also achieve the effect of treating dissecting aneurysms. For dissecting aneurysms, the arterial blood vessel wall reinforcement and protection device provided by the utility model can reduce the pressure of the aneurysm wall blood vessels, induce the formation of thrombus in the aneurysm cavity, and reduce the aneurysm body by organization and reduce the risk of rupture, thereby achieving the effect of traditional covered stents in treating aortic aneurysms, and can not block the branch blood vessels on the aneurysm, and guide blood to flow into the branch blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic diagram showing the structure of a first embodiment of an arterial blood vessel wall reinforcement and protection device;

[0016] Figure 2 A schematic diagram showing the deployment of a first embodiment of an arterial blood vessel wall reinforcement and protection device;

[0017] Figure 3 A schematic diagram showing the deployment of a second embodiment of the arterial blood vessel wall reinforcement and protection device;

[0018] Figure 4 A schematic diagram showing the structure of a third embodiment of the arterial blood vessel wall reinforcement and protection device;

[0019] Figure 5 A schematic diagram showing the deployment of a third embodiment of the arterial blood vessel wall reinforcement and protection device;

[0020] Figure 6 A schematic diagram showing the deployment of a fourth embodiment of the arterial blood vessel wall reinforcement and protection device;

[0021] Figure 7 Schematic diagrams showing end barbs of various embodiments of an arterial blood vessel wall reinforcement and protection device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0023] The arterial blood vessel wall reinforcement and protection device provided by the utility model adopts two or more single-layer tubular flow-forming parts, and especially achieves the purpose of reinforcing the blood vessel wall by overlapping the tubular flow-forming parts with each other. When the elasticity of the patient's arterial blood vessel wall is reduced, the arterial blood vessel wall reinforcement and protection device provided by the utility model has a reinforcement effect on the arterial blood vessel wall, and can effectively prevent the occurrence of diseases such as ruptures and dissections in the arterial blood vessel wall. The following is an exemplary description using two single-layer tubular flow-forming parts overlapping with each other. It is easy for those skilled in the art to understand that, according to the characteristics of the arterial blood vessel wall of different patients, different numbers of tubular flow-forming parts can be overlapped to achieve the purpose of reinforcing the arterial blood vessel wall. In addition, it is easy for those skilled in the art to understand that although the aortic blood vessel wall is used as an example description below, the arterial blood vessel wall reinforcement and protection device provided by the utility model is also applicable to the reinforcement and protection of many other arterial blood vessel walls.

[0024] See also Figure 1 and Figure 2 According to the first embodiment of the arterial blood vessel wall reinforcement and protection device provided by the utility model, it includes two single-layer grid-shaped tubular flow-forming members 11 and 12. The two grid-shaped tubular flow-forming members can be mutually overlapped along the axial length direction. When the two grid-shaped tubular flow-forming members are mutually overlapped along the axial length direction, a nested stent 10 is formed. Figure 1The nested stent 10 includes a sparse segment 110 and a dense segment 120, wherein the grid spacing of the sparse segment 110 is greater than the grid spacing of the dense segment 120. The dense segment 120 is formed at both ends of the nested stent 10, and the sparse segment 110 is adjacent to the dense segment 120 and is formed in the middle of the nested stent 10.

[0025] Specifically, continue to refer to Figure 1 , the two grid-shaped tubular flow shapers 11 and 12 are of equal length, wherein the grid-shaped tubular flow shaper 11 is configured as the inner layer support of the nested support 10, and the grid-shaped tubular flow shaper 12 is configured as the outer layer support of the nested support 10. The grid-shaped tubular flow shaper 11 as the inner layer support has a dense mesh segment 111 with a first mesh spacing and a sparse mesh segment 112 with a second mesh spacing, the second mesh spacing is greater than the first mesh spacing, and the dense mesh segment 111 is located on both sides of the sparse mesh segment 112. The grid spacing of the grid-shaped tubular flow shaper 12 as the outer layer support is greater than the first grid spacing of the dense mesh segment 111. Optionally, the grid spacing of the grid-shaped tubular flow shaper 12 as the outer layer support is equal to the second grid spacing of the sparse mesh segment 112.

[0026] refer to Figure 2 The nested stent 10 has a sparse segment 110 and two dense segments 120, which are respectively formed at two ends of the nested stent 10. The sparse segment 110 is suitable for being arranged in the artery of the aortic arch segment, one of the dense segments 120 is suitable for being arranged in the artery of the ascending aorta segment, and the other dense segment 120 is suitable for being arranged in the artery of the descending aorta segment. Figure 2 In the arterial blood vessel wall reinforcement and protection device of the first embodiment shown, since the grid spacing of the outer tubular flow-forming member 12 is larger, the transport resistance of the outer stent is smaller. The tubular flow-forming member 12 with smaller resistance and located on the outer layer is first transported and released to occupy the lesion position, which can improve the efficiency of the operation; then the tubular flow-forming member 11 located on the inner layer with relatively larger resistance is transported and released. The arterial blood vessel wall reinforcement and protection device of the utility model reinforces the arterial blood vessel wall by nesting two or more layers of grid-shaped tubular flow-forming members. Single-layer stents of different numbers of layers can be flexibly configured according to the characteristics of the lesion position, while reducing the difficulty of implantation. The nested stent after stacking can prevent vascular diseases such as dissection caused by reduced elasticity of arterial blood vessels.

[0027] See also Figure 3 According to the second embodiment of the arterial blood vessel wall reinforcement and protection device provided by the utility model, the overall structure is similar to that of the first embodiment, and the main difference is that the number of dense sections is different and it is suitable for different diseases.

[0028] refer to Figure 3The arterial blood vessel wall reinforcement and protection device of the second embodiment includes two grid-shaped tubular flow shapers of unequal lengths, which form a nested stent 20 when overlapped. The shorter grid-shaped tubular flow shaper 22 is configured as the outer stent of the nested stent 20, and the longer grid-shaped tubular flow shaper 21 is configured as the inner stent of the nested stent 20, and the grid spacing of the outer stent is smaller than the grid spacing of the inner stent. The nested stent 20 has a sparse segment 210 and a dense segment 220, and the dense segment 220 is suitable for being arranged in the artery of the ascending aorta segment, and the sparse segment 210 is suitable for being arranged in the artery of the aortic arch segment and the descending aorta segment.

[0029] In deployment Figure 3 When the arterial vascular wall reinforcement and protection device of the second embodiment is shown, the shorter outer stent can be released first, and then the longer inner stent can be released. In the case where the dissection only occurs in the ascending aorta, the shorter stent with a smaller grid is selected to be released first, which can ensure the radial support force and prevent displacement caused by the impact of rapid blood flow; the stent with a larger grid is released later to enhance the anchoring effect and not hinder the blood flow path at the three-branched blood vessels of the aortic arch. After the two-layer grid-shaped tubular flow shaping member is released, the blood flow can still enter the aneurysm cavity through the holes on each layer, but the blood flow velocity is significantly reduced and a vortex state is formed, so that there is a possibility of thrombosis in the part of the aneurysm cavity without an outflow tract. Since most of the impact pressure of the blood flow on the wall of the dissecting aneurysm is borne by the inner and outer stents, and endothelialization occurs after long-term implantation, the risk of aneurysm rupture is reduced.

[0030] refer to Figure 4 and Figure 5 According to the third embodiment of the arterial blood vessel wall reinforcement and protection device provided by the utility model, it includes two spiral tubular flow shapers 31 and 32 of equal length and opposite spiral directions. The two spiral tubular flow shapers can be mutually overlapped along the axial length direction. When the two spiral tubular flow shapers are mutually overlapped along the axial length direction, a nested stent 30 is formed. One of the spiral tubular flow shapers 31 is configured as an inner layer stent of the nested stent 30, and the other spiral tubular flow shaper 32 is configured as an outer layer stent of the nested stent 30.

[0031] Specifically, refer to Figure 4The spiral tubular flow shaper 31 as the inner layer support comprises a dense mesh segment 311 with a first pitch and a sparse mesh segment 312 with a second pitch, the second pitch is greater than the first pitch, and the dense mesh segment 311 is located on both sides of the sparse mesh segment 312. The spiral direction of the spiral tubular flow shaper 32 of the outer layer support is opposite to that of the spiral tubular flow shaper 31 of the inner layer support. The spiral tubular flow shaper 32 of the outer layer support comprises a dense mesh segment 321 with a first pitch and a sparse mesh segment 322 with a second pitch, and the dense mesh segment 321 is located on both sides of the sparse mesh segment 322. The pitch of the dense mesh segment 321 is the same as that of the dense mesh segment 311, and the pitch of the sparse mesh segment 322 is the same as that of the sparse mesh segment 312.

[0032] For reference Figure 4 and Figure 5 According to the arterial blood vessel wall reinforcement and protection device of the third embodiment, the nested stent 30 has a sparse segment 310 and two dense segments 320, and the two dense segments 320 are respectively formed at the two ends of the nested stent 30. The sparse segment 310 is suitable for being arranged in the artery of the aortic arch segment, one of the dense segments 320 is suitable for being arranged in the artery of the ascending aorta segment, and the other dense segment 320 is suitable for being arranged in the artery of the descending aorta segment. Figure 5 When the arterial blood vessel wall reinforcement and protection device of the third embodiment is shown, the spiral tubular flow-forming member 32 as the outer stent can be released first, and then the spiral tubular flow-forming member 31 as the inner stent can be released. The outer tubular flow-forming member 32 is first delivered and released to occupy the lesion position, which can improve the efficiency of the operation. The arterial blood vessel wall reinforcement and protection device of the utility model reinforces the arterial blood vessel wall by nesting two or more layers of spiral tubular flow-forming members. Different layers of single-layer stents can be flexibly configured according to the characteristics of the lesion position, while reducing the difficulty of implantation. The nested stent after stacking can prevent vascular diseases such as dissection caused by reduced elasticity of arterial blood vessels.

[0033] See also Figure 6 According to the fourth embodiment of the arterial blood vessel wall reinforcement and protection device provided by the utility model, the overall structure is similar to that of the third embodiment, and the main difference is that the number of dense sections is different and it is suitable for different diseases.

[0034] refer to Figure 6The arterial blood vessel wall reinforcement and protection device of the fourth embodiment includes two spiral tubular flow shapers 41 and 42 of unequal lengths and opposite spiral directions. The two grid-shaped tubular flow shapers of unequal lengths form a nested stent 40 when overlapped. The shorter spiral tubular flow shaper 42 is configured as the outer stent of the nested stent 40, and the longer spiral tubular flow shaper 41 is configured as the inner stent of the nested stent 40. The pitch of the spiral tubular flow shaper 41 as the inner stent is greater than the pitch of the spiral tubular flow shaper 42 as the outer stent. The nested stent 40 has a sparse section 410 and a dense section 420. The dense section 420 is formed at the proximal end (the end closer to the heart) of the nested stent 40, and the portion of the nested stent 40 other than the dense section 420 is the sparse section 410. The dense segment 420 is suitable for being arranged in the arterial blood vessels of the ascending aorta segment, and the sparse segment 410 is suitable for being arranged in the arterial blood vessels of the aortic arch segment and the descending aorta segment.

[0035] In deployment Figure 6 When the arterial vascular wall reinforcement and protection device of the fourth embodiment is shown, the spiral tubular flow-shaping member 42 (shorter) as the outer stent can be released first, and then the spiral tubular flow-shaping member 41 (longer) as the inner stent can be released. In the case where the dissection only occurs in the ascending aorta, the outer stent with a shorter length and a smaller pitch is selected to be released first, which can ensure the radial support force and prevent displacement caused by the impact of rapid blood flow; the inner stent with a larger pitch is released later to enhance the anchoring effect and not hinder the blood flow path at the three-branched blood vessels of the aortic arch. After the two layers of spiral tubular flow-shaping members are released, the blood flow can still enter the aneurysm cavity through the holes on each layer, but the blood flow velocity is significantly reduced and a vortex state is formed, so that there is a possibility of thrombosis in the part of the aneurysm cavity without an outflow tract. Since most of the impact pressure of the blood flow on the wall of the dissecting aneurysm is borne by the inner and outer stents, and endothelialization is achieved after long-term implantation, the risk of aneurysm rupture is reduced.

[0036] refer to Figure 7In one or more optional embodiments, in order to increase the anchoring effect of the arterial vascular wall reinforcement and protection device, anchoring thorns 50 are evenly or unevenly arranged on the circumference of one end (e.g., the proximal end) of the nested stent, and the anchoring thorns 50 are inclined toward the outside of each tubular flow shaper. Specifically, for the aortic vascular wall reinforcement and protection device, the anchoring thorns 50 can be fixed on the circumference of the proximal end of the nested stent by welding or bonding. More specifically, the length of the anchoring thorns 50 is 1~4mm, and the angle with the central axis of each tubular flow shaper is 20~70°. For shorter tubular flow shapers, multiple circles of anchoring thorns 50 can be arranged at the proximal end to prevent the occurrence of insufficient anchoring under the impact of rapid blood flow in the aorta. Preferably, in one or more embodiments, the surface of each tubular flow shaper is also coated with an anticoagulant coating, such as phosphorylcholine or heparin, to prevent the occurrence of thrombus during use.

[0037] The utility model forms a nested stent with a certain grid density by stacking two or more layers of tubular flow-forming parts. When the elasticity of the patient's arterial wall is reduced, the protective device is implanted through minimally invasive surgery to reinforce the arterial wall, which can effectively prevent diseases such as ruptures and dissections in the arterial wall. Each tubular flow-forming part can be a cut or woven single-layer stent. In the case of poor elasticity of the vascular wall, more layers of tubular flow-forming parts can be stacked, and the multi-layer stacking can achieve the effect of grid encryption. The nested stent presents dense segments and sparse segments. The dense segment can increase the anchoring ability of the arterial wall reinforcement protective device in various arterial vessels, and the sparse segment can be particularly suitable for the aortic arch segment of the aortic vessel to prevent blood from entering the brachiocephalic trunk, left common carotid artery, and left subclavian artery, thereby avoiding cerebral hemorrhage.

[0038] The arterial blood vessel wall reinforcement and protection device provided by the utility model can not only reinforce the arterial blood vessel wall to achieve a preventive effect, but also achieve the effect of treating dissecting aneurysms. For dissecting aneurysms, the arterial blood vessel wall reinforcement and protection device provided by the utility model can reduce the pressure of the aneurysm wall blood vessels, induce thrombus formation in the aneurysm cavity, and shrink the aneurysm by organization and reduce the risk of rupture, thereby achieving the effect of traditional covered stents in treating aortic aneurysms, and can not block the branch blood vessels on the aneurysm, and guide blood to flow into the branch blood vessels.

[0039] The above are only several embodiments of the present disclosure. Those skilled in the art may make various changes or modifications to the embodiments of the present disclosure based on the contents disclosed in the application documents without departing from the spirit and scope of the present disclosure.

Claims

1. An arterial blood vessel wall reinforcement and protection device, characterized in that: It comprises at least two single-layer tubular flow-forming members with hollow sidewalls, each tubular flow-forming member can be mutually overlapped along the axial length direction, and when each tubular flow-forming member is mutually overlapped, a nested bracket is formed; The nested stent comprises a sparse segment and a dense segment, and the grid spacing of the sparse segment is greater than the grid spacing of the dense segment; The dense segment is formed at at least one end of the nested stents, and the sparse segment is adjacent to the dense segment and is formed at least in the middle of the nested stents.

2. The arterial blood vessel wall reinforcement and protection device according to claim 1, characterized in that: The tubular flow shaping member is configured into two pieces, the two tubular flow shaping members are equal in length and both are in a grid shape, one of the tubular flow shaping members is configured as an inner layer support of the nested support, and the other tubular flow shaping member is configured as an outer layer support of the nested support; The inner layer support comprises a dense mesh segment with a first mesh spacing and a sparse mesh segment with a second mesh spacing, the second mesh spacing is greater than the first mesh spacing, and the dense mesh segment is located on both sides of the sparse mesh segment; The grid spacing of the outer support is greater than the first grid spacing; The nested stent has a sparse segment and two dense segments, which are respectively formed at two ends of the nested stent. The sparse segment is suitable for being arranged in the arterial blood vessel of the aortic arch segment, one of the dense segments is suitable for being arranged in the arterial blood vessel of the ascending aorta segment, and the other dense segment is suitable for being arranged in the arterial blood vessel of the descending aorta segment.

3. The arterial blood vessel wall reinforcement and protection device according to claim 2, characterized in that: The grid spacing of the outer support is equal to the second grid spacing.

4. The arterial blood vessel wall reinforcement and protection device according to claim 1, characterized in that: The tubular flow shaping member is configured into two pieces, the two tubular flow shaping members are of unequal lengths and are both in a grid shape, wherein the shorter tubular flow shaping member is configured as an outer layer support of the nested support, and the longer tubular flow shaping member is configured as an inner layer support of the nested support; The grid spacing of the inner layer support is greater than the grid spacing of the outer layer support; The nested stent has a sparse segment and a dense segment, wherein the dense segment includes the outer stent, the dense segment is suitable for being arranged in the artery of the ascending aorta segment, and the sparse segment is suitable for being arranged in the artery of the aortic arch segment and the descending aorta segment.

5. The arterial blood vessel wall reinforcement and protection device according to claim 1, characterized in that: The tubular flow shaping member is configured into two pieces, the two tubular flow shaping members are of equal length and are both spiral-shaped, and the spiral directions of the two tubular flow shaping members are opposite; one of the tubular flow shaping members is configured as an inner layer support of the nested support, and the other tubular flow shaping member is configured as an outer layer support of the nested support; The inner layer support and the outer layer support respectively include a dense mesh segment with a first pitch and a sparse mesh segment with a second pitch, wherein the second pitch is greater than the first pitch, and the dense mesh segment is located on both sides of the sparse mesh segment; The nested stent has a sparse segment and two dense segments, which are respectively formed at two ends of the nested stent. The sparse segment is suitable for being arranged in the arterial blood vessel of the aortic arch segment, one of the dense segments is suitable for being arranged in the arterial blood vessel of the ascending aorta segment, and the other dense segment is suitable for being arranged in the arterial blood vessel of the descending aorta segment.

6. The arterial blood vessel wall reinforcement and protection device according to claim 1, characterized in that: The tubular flow shaping member is configured into two, the two tubular flow shaping members are of unequal lengths and are both spiral-shaped, and the spiral directions of the two tubular flow shaping members are opposite; wherein the shorter tubular flow shaping member is configured as an outer layer support of the nested support, and the longer tubular flow shaping member is configured as an inner layer support of the nested support; The pitch of the inner layer support is greater than the pitch of the outer layer support; The nested stent has a sparse segment and a dense segment, wherein the dense segment includes the outer stent, the dense segment is suitable for being arranged in the artery of the ascending aorta segment, and the sparse segment is suitable for being arranged in the artery of the aortic arch segment and the descending aorta segment.

7. The arterial blood vessel wall reinforcement and protection device according to any one of claims 2 to 6, characterized in that: At least one of the tubular flow shaping members is provided with an anchoring barb at its proximal end.

8. The arterial blood vessel wall reinforcement and protection device according to claim 7, characterized in that: The anchoring thorn is inclined toward the outside of each tubular flow-forming member, and the angle between the anchoring thorn and the central axis of each tubular flow-forming member is 20-70°; the length of the anchoring thorn is 1-4 mm.

9. The arterial blood vessel wall reinforcement and protection device according to claim 4 or 6, characterized in that: The proximal end of the outer layer stent is provided with a plurality of circles of anchoring thorns.

10. The arterial blood vessel wall reinforcement and protection device according to claim 1, characterized in that: The outer surface of the tubular flow shaping member is coated with an anti-coagulation coating.

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