A follow-up support and a bionic vascular covered stent

Abstract

The application discloses a follow-up support and a bionic vascular covered stent and belongs to the technical field of medical devices, which comprises a first elliptical ring, a second elliptical ring and a fixing piece, the fixing piece is provided with first sliding holes and second sliding holes which are staggered with each other, the first elliptical ring and the second elliptical ring each comprise two arc-shaped elastic rods, the two ends of the arc-shaped elastic rods are each fixed with a limiting column for sliding of the corresponding end of the other arc-shaped elastic rod, the two end rod arms of the arc-shaped elastic rods of the first elliptical ring and the second elliptical ring pass through the first sliding holes and the second sliding holes respectively, and the limiting column and the fixing piece are connected with a blood pumping spring. The bionic vascular covered stent comprises a main body covered stent, a sandwich is accommodated between an inner elastic film and an outer elastic film of the main body covered stent, Z-shaped supports are arranged at the two ends of the sandwich, and a follow-up support is arranged at the middle part. The bionic vascular covered stent provided with the follow-up support can simulate the mechanical behavior of an aorta, effectively treat diseases and restore or retain the elastic pumping function of the aorta.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a follow-up stent and a biomimetic vascular covered stent. Background Technology

[0002] The aorta is the main blood vessel that carries blood from the heart to all parts of the body. The aortic wall is rich in elastic fibers, allowing it to passively expand during systole as blood pressure rises, temporarily storing some blood and kinetic energy. During diastole, it contracts due to its elastic recoil, pushing the stored blood distally. This periodic expansion and contraction pumps blood. The aortic arch, due to its unique structure and the high-pressure blood flow it bears, is a high-risk area for vascular diseases such as aortic dissection and aneurysm. Currently, clinical treatment for aortic dissection and aneurysm in the aortic arch primarily involves implanting a endovascular stent graft to seal the dissection opening, establish a blood flow channel, isolate the aneurysm's blood supply, and promote pseudolumen embolization or aneurysm shrinkage, thus achieving the therapeutic goal.

[0003] Currently, the most widely used covered stents in clinical practice mainly consist of a covering and a multi-segment Z-shaped stent. The covering acts as a barrier to blood flow, while the Z-shaped stent provides continuous radial support to the covering, ensuring close adhesion between the covering and the vessel wall and maintaining unobstructed blood flow. However, due to the constant high radial support provided by the Z-shaped stent and the limited elasticity of the covering material, the radial expansion and contraction of the implanted aortic segment are severely restricted, resulting in a reduced pumping capacity compared to healthy vessels. During cardiac systole, blood pressure rises, requiring aortic dilation. However, the implanted covered stent prevents this segment from dilating (because the covered stent cannot dilate radially). During cardiac diastole, blood pressure drops, requiring aortic contraction to pump blood. Again, the implanted covered stent obstructs contraction in this segment (although the covered stent can contract radially, its radial support counteracts some of the contractile force), weakening the aortic's pumping function.

[0004] This restriction on the periodic contraction and relaxation of blood vessels is particularly detrimental to patients whose aortic function is already impaired. It may not only hinder the recovery of vital aortic physiological functions but also, by altering the local hemodynamic environment, lead to long-term risks such as left ventricular hypertrophy, poor proximal or distal vascular remodeling, and device-related complications. Therefore, there is an urgent need for a new type of vascular stent graft that can effectively treat the disease while restoring or preserving the aorta's elastic pump function. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems and provide a follow-up stent and a biomimetic vascular graft stent. After the follow-up stent is placed on the vascular graft stent and implanted into the aorta, the vascular graft stent can expand and contract with the blood pressure changes caused by the contraction and relaxation of the heart, simulating the mechanical behavior of a healthy aorta. While effectively treating the disease, it restores or preserves the elastic pump function of the aorta.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a follower bracket, including a first elliptical ring, a second elliptical ring, and two fixing members. The fixing members are provided with interlocking first and second sliding holes. Both the first and second elliptical rings include two arc-shaped elastic rods. Each end of an arc-shaped elastic rod is fixedly connected to a limiting post, and the limiting post is provided with a sliding hole, through which the corresponding end of the other arc-shaped elastic rod is slidably fitted. The two ends of the arc-shaped elastic rod of the first elliptical ring pass through the first sliding holes of the two fixing members, respectively. The two ends of the arc-shaped elastic rod of the second elliptical ring pass through the second sliding holes of the two fixing members, respectively. A pump spring connects the limiting post and the fixing members.

[0007] Preferably, the first sliding hole and the second sliding hole are perpendicular to each other.

[0008] A biomimetic vascular endothelial stent is also disclosed, comprising a main endothelial stent, the main endothelial stent comprising a tubular main endothelial membrane, the tubular wall of the main endothelial membrane comprising an inner elastic membrane and an outer elastic membrane arranged sequentially inside and outside, a closed receiving interlayer between the inner elastic membrane and the outer elastic membrane, Z-shaped stents provided at both ends of the receiving interlayer, and the aforementioned follower stent provided in the middle of the receiving interlayer.

[0009] Preferably, a plurality of the following supports are arranged sequentially at intervals along the axial direction of the main body film in the middle of the receiving interlayer, with adjacent following supports being staggered.

[0010] Preferably, the device further includes a branched membrane support, wherein the inner elastic membrane and the outer elastic membrane are respectively provided with an inner membrane opening and an outer membrane opening, and the two ends of the branched membrane support are respectively closed and connected to the inner membrane opening and the outer membrane opening.

[0011] Preferably, the branched membrane support includes a tubular branched membrane and a branch support for radially supporting the branched membrane. The two ends of the branched membrane extend out of the outer membrane opening and the inner membrane opening, respectively. One end of the branched membrane extending out of the outer membrane opening is closed and connected to the outer membrane opening through an outer conical membrane, and the other end of the branched membrane extending out of the inner membrane opening is closed and connected to the inner membrane opening through an inner conical membrane. The branch support is capable of expanding and contracting along the axial direction of the branched membrane.

[0012] Preferably, the branch support includes a first circular ring and a second circular ring. Both the first circular ring and the second circular ring are provided with a connecting portion and a force-bearing portion. The connecting portion and the force-bearing portion are symmetrical about the ring center. The connecting portion of the first circular ring and the connecting portion of the second circular ring are fixedly connected. The force-bearing portion of the first circular ring is close to and fixedly connected to the outer conical membrane. The force-bearing portion of the first circular ring is close to the outer conical membrane, and the force-bearing portion of the second circular ring is close to the inner conical membrane.

[0013] Preferably, both the connecting part and the force-bearing part are outwardly bent triangular.

[0014] Preferably, the branch support is made of a single wire.

[0015] Preferably, the branch support includes two rhomboid supports, which are symmetrically arranged on the outer wall of the branch covering film, and the shorter of the two diagonals of the rhomboid supports is parallel to the axis of the branch covering film.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] The movable stent in this invention mainly consists of a first elliptical ring, a second elliptical ring, a fixing element, a limiting post, and a blood pump spring. Its overall shape resembles a butterfly, with four arc-shaped elastic rods forming the four wings of the butterfly stent. When placed on a vascular covered stent and implanted into the aorta, during cardiac systole, blood pressure rises, the aorta dilates, and the covering of the stent expands outward under blood pressure. The two arc-shaped elastic rods of the first and second elliptical rings move away from each other. The limiting post moves towards the fixing element, compressing the blood pump spring. Both the first and second elliptical rings lengthen, and the movable stent expands as a whole, allowing the covered stent to expand along with the aorta. During cardiac diastole, blood pressure decreases, the aorta constricts, and the covered stent retracts under the recoil force of the aorta. The two arc-shaped elastic rods of the first and second elliptical rings move closer together, and with the elastic restoring force of the blood pump spring, the limiting post returns to its original position. Both the first and second elliptical rings shorten, and the movable stent shrinks as a whole, thus not affecting the contraction of the covered stent, allowing it to contract along with the aorta, achieving blood pumping. This enables vascular stent grafts with servo-guided stents to become biomimetic vascular stents capable of mimicking the mechanical behavior of a healthy aorta, effectively treating diseases while restoring or preserving the elastic pump function of the aorta. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained by analyzing these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the biomimetic vascular graft stent in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the external structure of the biomimetic vascular graft stent in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the biomimetic vascular graft stent after the external elastic membrane is removed in an embodiment of the present invention;

[0022] Figure 4 This is a three-dimensional structural diagram of the follower bracket in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the first elliptical ring or the second elliptical ring in an embodiment of the present invention;

[0024] Figure 6 This is a cross-sectional view of the follower bracket at the fixing member in an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the follower bracket at the limiting post in an embodiment of the present invention;

[0026] Figure 8 This is a cross-sectional view of the main film-coated support at the branch film-coated support in an embodiment of the present invention;

[0027] Figure 9 This is a frontal view structural diagram of the branch coating and branch support in an embodiment of the present invention;

[0028] Figure 10 This is a top-view structural diagram of the branch support in an embodiment of the present invention;

[0029] Figure 11 This is a three-dimensional structural diagram of the branch coating and branch support in an embodiment of the present invention;

[0030] Figure 12 This is a three-dimensional structural diagram of the branch support in an embodiment of the present invention;

[0031] Figure 13 This is a frontal view structural diagram of the branch coating and the rhomboid support in an embodiment of the present invention;

[0032] Figure 14 This is a three-dimensional structural diagram of the branch coating and the rhomboid support in an embodiment of the present invention;

[0033] Figure 15 This describes the positional relationship between a traditional covered stent and the aorta, branch vessels, and lesion location.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Main body film-coated support;

[0036] 11. External elastic membrane; 12. Internal elastic membrane; 13. Accommodating interlayer; 14. Z-shaped support; 15. Follow-up support;

[0037] 151. First elliptical ring; 152. Second elliptical ring; 153. Fixing component; 154. Arc-shaped elastic rod; 155. Limiting post; 156. Pumping spring;

[0038] 2. Branched covered scaffold;

[0039] 21. Branched membrane; 22. Branched support; 23. Outer conical membrane; 24. Inner conical membrane;

[0040] 221. First circular ring; 222. Second circular ring; 223. Connecting part; 224. Force-bearing part; 225. Rhomboid bracket. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The purpose of this invention is to provide a follow-up stent and a biomimetic vascular graft stent to solve the problems existing in the prior art. After the follow-up stent is placed on the vascular graft stent and implanted into the aorta, the vascular graft stent can expand and contract with the blood pressure changes caused by the contraction and relaxation of the heart, simulating the mechanical behavior of a healthy aorta. While effectively treating the disease, it restores or preserves the elastic pump function of the aorta.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1

[0045] like Figures 1 to 15As shown, this embodiment provides a follower bracket, including a first elliptical ring 151, a second elliptical ring 152, and two fixing members 153. The fixing members 153 are provided with a first sliding hole and a second sliding hole, which are intersecting but not connected. Both the first elliptical ring 151 and the second elliptical ring 152 include two arc-shaped elastic rods 154, with each end of the arc-shaped elastic rod 154 fixedly connected to a limiting post 155. The limiting post 155 is provided with a sliding hole, allowing the corresponding end of the other arc-shaped elastic rod 154 to slide within it. The two ends of the arc-shaped elastic rod 154 of the first elliptical ring 151 pass through the first sliding holes of the two fixing members 153, respectively; the two ends of the arc-shaped elastic rod 154 of the second elliptical ring 152 pass through the second sliding holes of the two fixing members 153, respectively. A pumping spring 156 connects the limiting post 155 and the fixing members 153, and the pumping spring 156 is sleeved on the arc-shaped elastic rod 154. The overall shape of the follower bracket 15 resembles a butterfly, so it can also be called a butterfly bracket. The four arc-shaped elastic rods 154 are the four wings of the butterfly bracket.

[0046] Working principle:

[0047] The follow-up stent 15 is placed on the cover of the covered stent, replacing the original Z-shaped stent in the middle of the covered stent. At this time, the first elliptical ring 151, the second elliptical ring 152 and the fixation member 153 are all fixedly connected to the cover. At this time, the blood pumping spring 156 is in a natural state or a slightly compressed state. Then, the covered stent with the follow-up stent 15 is implanted into the aortic blood vessel.

[0048] During cardiac systole, blood pressure rises and the aorta dilates. At this time, the lining of the covered stent expands outward under blood pressure. The two arc-shaped elastic rods 154 of the first elliptical ring 151 and the second elliptical ring 152 move away from each other, and the limiting post 155 moves toward the fixing member 153, compressing the blood pumping spring 156 (the elastic support force of the blood pumping spring 156 is less than the aortic dilation force given by the blood pressure). Both the first elliptical ring 151 and the second elliptical ring 152 elongate, expanding as a whole with the stent 15, without affecting the expansion of the covered stent, so that it expands with the expansion of the aorta.

[0049] During diastole, blood pressure decreases, and the aorta constricts. At this time, the covering of the stent retracts under the recoil force of the aorta. The two arc-shaped elastic rods 154 of the first elliptical ring 151 and the second elliptical ring 152 move closer together. Combined with the elastic restoring force of the pumping spring 156, the limiting post 155 is pushed back to its original position. Both the first elliptical ring 151 and the second elliptical ring 152 shorten, and the stent 15 shrinks as a whole, thus not affecting the contraction of the covering of the stent. It contracts with the aorta, achieving blood pumping. Furthermore, the elastic restoring force of the pumping spring 156 reduces the resistance to aortic contraction and restoring, thereby reducing the load pressure on the implanted segment of the aorta (including the lesion site).

[0050] In one embodiment, the first sliding hole and the second sliding hole are perpendicular to each other, so that the axes of the first elliptical ring 151 and the second elliptical ring 152 are perpendicular to each other.

[0051] In one embodiment, the fixing member 153 is a cross-shaped four-way connector, wherein one connector of the cross-shaped four-way connector has two first sliding holes, and the other connector has two second sliding holes. The two first sliding holes allow one end of each of the two arc-shaped elastic rods 154 of the first elliptical ring 151 to pass through. The two second sliding holes allow one end of each of the two arc-shaped elastic rods 154 of the second elliptical ring 152 to pass through.

[0052] The two first sliding holes are located in the same plane, and the two second sliding holes are located in the same plane. The first sliding holes and the second sliding holes are not located in the same plane, so as to ensure that the two arc-shaped elastic rods 154 of the first elliptical ring 151 and the two arc-shaped elastic rods 154 of the second elliptical ring 152 can move alternately without interference.

[0053] In one embodiment, the arc-shaped elastic rod 154 is made of an elastic alloy. Of course, other suitable materials may also be used if available.

[0054] Example 2

[0055] like Figures 1 to 15As shown, this embodiment provides a biomimetic vascular endothelial stent, including a main endothelial stent 1. The main endothelial stent 1 includes a tubular main endothelial membrane. The wall of the main endothelial membrane includes an outer elastic membrane 11 and an inner elastic membrane 12, which are arranged sequentially from the inside to the outside. Both the inner elastic membrane 12 and the outer elastic membrane 11 are elastic membranes that can expand and contract with the heart pumping blood. A closed receiving interlayer 13 is provided between the inner elastic membrane 12 and the outer elastic membrane 11. Z-shaped stents 14 are provided at both ends of the receiving interlayer 13 to ensure that the main endothelial stent 1 seals the vascular rupture. The Z-shaped stents 14 are fixed to the inner wall of the outer elastic membrane 11 and / or the inner wall of the inner elastic membrane 12, and the fixation method can be suture. The middle part of the receiving interlayer 13 (i.e., the middle section, representing the part between the two ends, not specifically the center position) is provided with the follow-up stent 15 as in Embodiment 1. The number of follow-up stents 15 is set as needed, and generally two to three follow-up stents 15 are usually provided. In specific configuration, the fixing element 153 of the follower stent 15 is fixed to the inner wall of the outer elastic membrane 11 and the inner wall of the inner elastic membrane 12, respectively. The arc-shaped elastic rod 154 is fixed to the inner wall of the outer elastic membrane 11 and / or the inner wall of the inner elastic membrane 12. The fixing method can be suture. This biomimetic vascular covered stent can be used for endovascular treatment of thoracic aortic arch vascular diseases (dissection and aneurysm).

[0056] Working principle:

[0057] When the heart contracts and pumps blood, the blood pressure flowing through the inner lumen of the main covered stent 1 increases, the internal elastic membrane 12 expands, the follower stent 15 expands radially along the main covered stent 1, the pumping spring 156 is compressed and generates a rebound force, which limits the further expansion of the diameter of the main covered stent 1.

[0058] When the heart relaxes, the blood pressure flowing through the lumen of the main covered stent 1 decreases, the force on the pumping spring 156 decreases, and under the restoring force of the pumping spring 156 and the contraction force of the aortic blood vessels, the follow-up stent 15 is driven to return to its original position, and the main covered stent 1 returns to its original position.

[0059] When the pressure generated by the movement of the pumping spring 156 is consistent with the pressure difference of blood pressure fluctuation, this bionic vascular endothelial stent can replace the pumping function of the aorta, thereby avoiding the risks of vascular aging, formation of new ruptures, and loss of elasticity caused by continuous pressure on the vascular endothelium of traditional endothelial stents.

[0060] With the support of the Z-shaped stents 14 at both ends of the main covered stent 1, the two ends of the main covered stent 1 do not expand or contract, ensuring that the two ends of the main covered stent 1 can have a good sealing contact with the inner wall of the aorta, preventing blood from flowing into the space between the main covered stent 1 and the inner wall of the aorta. Therefore, the expansion and contraction of the main covered stent 1 mainly occurs in the middle (i.e., the mid-segment).

[0061] In one embodiment, two Z-shaped supports 14 are provided at each end of the receiving interlayer 13 (main body film-coated support 1). The two Z-shaped supports 14 are arranged at intervals along the axial direction of the receiving interlayer 13 (main body film-coated support 1). Preferably, the Z-shaped support 14 closer to the end is larger than the other Z-shaped support 14.

[0062] In one embodiment, a plurality of follower brackets 15 are arranged sequentially at intervals along the axial direction of the main body film in the middle part of the receiving interlayer 13. Adjacent follower brackets 15 are staggered, for example, the fixing members 153 of two adjacent follower brackets 15 are not in the plane, that is, when viewed from the end of the main body film, the fixing members 153 of two adjacent follower brackets 15 are staggered on the circumference of the main body film. Preferably, the continuity of the two fixing members 153 of one of the two adjacent follower brackets 15 is perpendicular to the continuity of the two fixing members 153 of the other follower bracket 15.

[0063] In one embodiment, the system further includes a branched covered stent 2, with an intima opening and an adventitia opening corresponding to the inner elastic membrane 12 and the outer elastic membrane 11. The two ends of the branched covered stent 2 are respectively sealed and connected to the intima opening and the adventitia opening. The branched covered stent 2 is used to establish blood flow channels between the aorta and branch vessels, corresponding to branch vessels. The number of branched covered stents 2 can be set as needed, by starting an equal number of intima openings and adventitia openings on the main covered stent 1.

[0064] In one embodiment, the branched membrane support 2 includes a tubular branched membrane 21 and a branch support 22, with the branch support 22 providing radial support for the branched membrane 21. The branched membrane 21 has an outer membrane opening and an inner membrane opening at its two ends, respectively. The end of the branched membrane 21 extending from the outer membrane opening is sealed to the outer membrane opening via an outer conical membrane 23. Specifically, the smaller diameter end of the outer conical membrane 23 is connected to the end of the branched membrane 21, and the larger diameter end of the outer conical membrane 23 is connected to the outer membrane opening. The end of the branched membrane 21 extending from the inner membrane opening is sealed to the inner membrane opening via an inner conical membrane 24. The smaller diameter end of the inner conical membrane 24 is connected to the end of the branched membrane 21, and the larger diameter end of the inner conical membrane 24 is connected to the inner membrane opening. The branch support 22 is capable of expanding and contracting along the axial direction of the branched membrane 21.

[0065] When a covered stent is used in aortic vessels (such as those in the aortic arch), an opening needs to be created in the covered stent to allow blood to flow to the branch vessels. If the lesion is located around the opening of a branch vessel (e.g., ... Figure 15As shown in the diagram, the opening of the covered stent needs to be able to fit snugly against the branch vessel opening; otherwise, blood will continue to flow towards the lesion site through the opening. However, the openings of existing covered stents are actually just radial openings on the covered stent, while the aortic branch openings are funnel-shaped. Therefore, existing covered stents cannot completely fit against the branch vessel openings, meaning that blood flow will inevitably touch the branch vessel opening after passing through it. If a lesion already exists at that location, the surgery will fail. In some cases, surgeons will implant a branch covered stent within the branch vessel to prevent blood flow from passing through the lesion site at the branch vessel opening. While this solves the problem, it is more complex, prolongs the operation time, increases the patient's surgical risk, and adds to the financial burden.

[0066] This biomimetic vascular stent graft directly incorporates a branch stent graft 2 onto the main stent graft 1. The outer and inner ends of the branch stent graft 2 are fitted with an outer conical membrane 23 and an inner conical membrane 24, respectively. The outer conical membrane 23 conforms to the shape of the branch vessel opening, forming a conical matching funnel shape. The branch stent 22 provides axial support to the branch stent graft 21, ensuring that the upper and lower outer conical membranes 23 and inner conical membranes 24 of the branch stent graft 2 remain open. The outer conical membrane 23 fits snugly against the funnel-shaped opening of the aortic branch, effectively covering the lesion and preventing blood flow from continuing to the lesion. Simultaneously, the inner conical membrane 24 reduces the impact of intraluminal hemodynamics on the main stent graft 1 and facilitates guidewire overselection. This allows the biomimetic vascular stent graft to be used alone or with an additional branch stent graft 2 implanted alongside the main stent graft 1.

[0067] In one embodiment, the branch support 22 includes a first circular ring 221 and a second circular ring 222, which are sewn onto the branch covering membrane 21. Both the first and second circular rings 221 and 222 are provided with a connecting portion 223 and a force-bearing portion 224, which are aligned along the ring's center. The connecting portion 223 of the first circular ring 221 and the connecting portion 223 of the second circular ring 222 are fixedly connected. The force-bearing portion 224 of the first circular ring 221 is close to the outer conical membrane 23, and the force-bearing portion 224 of the second circular ring 222 is close to the inner conical membrane 24. Viewed from the front, the branch support 22 is V-shaped; viewed from the top, it is circular. The first and second circular rings 221 and 222 can approach and retract from each other, enabling the branch covering membrane 21 to expand and contract axially.

[0068] In one embodiment, both the connecting portion 223 and the force-receiving portion 224 are outwardly bent triangular. This provides four sharp corners on the first circular ring 221 and the second circular ring 222, guiding the compression of the branch stent 22 along the branch graft 21 axially. The sharp corner protrusions facilitate the compression of the branch stent 22, allowing the biomimetic vascular graft stent to be compressed into the delivery sheath.

[0069] In one embodiment, the branch support 22 is made of a single wire.

[0070] In one embodiment, the branch support 22 includes two rhomboid supports 225, which are symmetrically arranged on the outer wall of the branch covering 21. The shorter of the two diagonals of the rhomboid supports 225 is parallel to the axis of the branch covering 21, forming another form of branch support 22. The rhomboid supports 225 can ensure the branch covering 21 can be opened, provide axial support for the branch covering 21, and also ensure the compression and repositioning capabilities of the branch support 22.

[0071] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A follower bracket, characterized in that, It includes a first elliptical ring, a second elliptical ring, and two fixing members. The fixing members are provided with intersecting first sliding holes and second sliding holes. The first elliptical ring and the second elliptical ring each include two arc-shaped elastic rods. The two ends of the arc-shaped elastic rods are fixedly connected to limit posts. The limit posts are provided with sliding holes, and the corresponding ends of the other arc-shaped elastic rods are slidably fitted into the sliding holes. The two ends of the arc-shaped elastic rod of the first elliptical ring pass through the first sliding holes of the two fixing members respectively; the two ends of the arc-shaped elastic rod of the second elliptical ring pass through the second sliding holes of the two fixing members respectively; a pump spring is connected between the limiting post and the fixing member.

2. The follower bracket according to claim 1, characterized in that, The first sliding hole and the second sliding hole are perpendicular to each other.

3. A biomimetic vascular covered stent, characterized in that, The system includes a main film-coated support, which includes a tubular main film. The tubular wall of the main film includes an inner elastic membrane and an outer elastic membrane arranged sequentially inside and outside. A closed receiving interlayer is provided between the inner elastic membrane and the outer elastic membrane. Z-shaped supports are provided at both ends of the receiving interlayer, and a follow-up support as described in claim 1 or 2 is provided in the middle of the receiving interlayer.

4. The biomimetic vascular covered stent according to claim 3, characterized in that, The middle part of the receiving interlayer is provided with a plurality of follower brackets arranged at intervals along the axial direction of the main body film, with adjacent follower brackets being staggered.

5. The biomimetic vascular covered stent according to claim 3, characterized in that, It also includes a branched membrane support, wherein the inner elastic membrane and the outer elastic membrane are respectively provided with an inner membrane opening and an outer membrane opening, and the two ends of the branched membrane support are respectively closed and connected to the inner membrane opening and the outer membrane opening.

6. The biomimetic vascular covered stent according to claim 5, characterized in that, The branched membrane support includes a tubular branched membrane and a branch support for radially supporting the branched membrane. The two ends of the branched membrane extend out of the outer membrane opening and the inner membrane opening, respectively. One end of the branched membrane extending out of the outer membrane opening is closed and connected to the outer membrane opening through an outer conical membrane, and the other end of the branched membrane extending out of the inner membrane opening is closed and connected to the inner membrane opening through an inner conical membrane. The branch support can expand and contract along the axial direction of the branched membrane.

7. The biomimetic vascular covered stent according to claim 6, characterized in that, The branch support includes a first circular ring and a second circular ring. Both the first circular ring and the second circular ring are provided with a connecting part and a force-bearing part. The connecting part and the force-bearing part are symmetrical about the center of the ring. The connecting part of the first circular ring and the connecting part of the second circular ring are fixedly connected. The force-bearing part of the first circular ring is close to the outer conical membrane and fixedly connected to the outer conical membrane. The force-bearing part of the first circular ring is close to the outer conical membrane, and the force-bearing part of the second circular ring is close to the inner conical membrane.

8. The biomimetic vascular covered stent according to claim 7, characterized in that, Both the connecting part and the force-bearing part are outwardly bent triangular in shape.

9. The biomimetic vascular covered stent according to claim 7 or 8, characterized in that, The branch support is made of a single wire.

10. The biomimetic vascular covered stent according to claim 6, characterized in that, The branch support includes two rhomboid supports, which are symmetrically arranged on the outer wall of the branch covering film. The shorter of the two diagonals of the rhomboid supports is parallel to the axis of the branch covering film.

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