Aortic stent graft and aortic stent graft assembly

Abstract

The present invention discloses an aortic stent graft and an aortic stent graft assembly, belonging to the field of medical device technology. The aortic stent graft includes a main stent graft and a branch stent graft; the main stent graft is provided with a mounting port; the branch stent graft includes an external port and an internal port, the edge of the external port near the upstream side is connected to the mounting port through a first diaphragm, the first diaphragm has a first outer convex surface and a first inner concave surface arranged oppositely; the edge of the inner port near the downstream side is connected to the mounting port through a second diaphragm, the second diaphragm has a second outer convex surface and a second inner concave surface arranged oppositely; the first diaphragm and the second diaphragm are connected by a third diaphragm, and the first diaphragm, the second diaphragm and the third diaphragm seal the mounting port. The assembly includes a connecting stent graft and the above-mentioned aortic stent graft. It can form an aortic stent graft that does not require opening the patient's healthy blood vessels, has a wide range of applications, is highly flexible, and takes up little compressed space.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an aortic stent graft and an aortic stent graft assembly. Background Art

[0002] Among the existing intravascular treatment technologies for the aortic arch, branch stent graft technology or embedded stent graft technology is mostly used. The branch stent graft or embedded stent graft of the main stent graft (actually the branch stent graft is built inside) is aligned with the opening of the aortic arch blood vessel, and then a connecting stent graft is implanted between the branch stent graft (or embedded stent graft) and the branch blood vessel to establish an intravascular blood flow channel.

[0003] During the intravascular deployment of the aortic arch stent graft, the branch stent graft (or embedded stent graft) opening needs to be aligned with the branch vessel opening. If the alignment is poor, it will lead to poor blood flow or even block the blood flow of the branch vessel. To ensure accurate alignment, existing branch stent grafts usually adopt two methods:

[0004] One method is to pre-place a guidewire in the branch stent graft (or embedded stent graft) for guidewire capture (applicable to branch stent graft) or guidewire superselection (applicable to embedded stent graft) to align the opening of the branch stent graft (or embedded stent graft) with the opening of the branch vessel. When the branch stent graft is to be captured by the guidewire, the carotid artery or brachial artery needs to be cut to form an opening, and a guidewire capture device is inserted through the opening and pulled out of the body. The guidewire is stretched to force the opening of the branch stent graft (or embedded stent graft) to align with the opening of the branch vessel, and then the main stent graft is released. However, this operation method requires cutting the patient's healthy blood vessels, causing unnecessary trauma to the patient. When performing guidewire superselection on an embedded covered stent, although there is no need to cut open the patient's healthy blood vessels for guidewire capture, the operating space in the vascular cavity is limited, and guidewire superselection needs to be performed when the main covered stent is half-released (the main covered stent cannot be fully opened, otherwise it will occupy too much space and there will be no operating space for the guidewire). However, even if it is half-released, it is still difficult to select the guidewire into the branch vessel opening in a narrow space. In addition, due to the addition of a guidewire or pre-placed catheter, the covered stent occupies too much space in the outer tube of the conveyor, and a thinner outer tube cannot be used. It is not suitable for patients with stenotic and tortuous blood vessels, and has a small scope of application.

[0005] The other method is to not set up a guidewire or catheter at all, and rely on the guidewire superselection technology to select the guidewire through the branch covered stent or the embedded covered stent into the branch blood vessel, thereby completing the implantation of the connected covered stent. However, this situation is difficult for inexperienced surgeons to complete the surgical operation using the guidewire superselection technology.

[0006] In addition, whether relying on the guidewire capture technology or the guidewire superselection technology, when aligning the branch stent graft with the branch vessel opening, it is also necessary to ensure that there is a certain degree of flexibility between the branch stent graft and the main stent graft. Some aortic stent grafts add a section of frustum-shaped soft membrane at the root where the branch stent graft is connected to the main stent graft to facilitate the adjustment of the direction of the branch stent graft. However, the disadvantage of this technology is that the axis of the branch stent graft and the main stent graft cannot be kept parallel during the compression process of the branch stent graft and the main stent graft into the outer tube of the conveyor. This results in a large compressed space and the risk of the branch stent graft being crushed.

[0007] Therefore, there is an urgent need for an aortic covered stent that does not require opening the patient's healthy blood vessels, has a wide range of applications, is highly flexible, and takes up little compressed space. Summary of the Invention

[0008] The purpose of the present invention is to solve the above technical problems and provide an aortic covered stent and an aortic covered stent assembly, wherein the main covered stent and the branch covered stent are connected by a first diaphragm and a second diaphragm, and the first diaphragm and the second diaphragm form a structure similar to a parallelogram. By utilizing the instability of the parallelogram, the branch covered stent can swing flexibly, which is convenient for the branch covered stent to be aligned with the opening of the branch blood vessel. During the process of loading into the outer tube of the conveyor, the axis of the branch covered stent can be deflected as much as possible to a position parallel to the axis of the main covered stent, which is convenient for the compression of the aortic covered stent. The second outer convex surface of the branch covered stent is conducive to the super-selection of the guide wire into the branch covered stent, and there is no need to cut the healthy branch blood vessel for guide wire capture, forming an aortic covered stent that does not require cutting the patient's healthy blood vessel, has a wide range of applications, is highly flexible, and has a small compressed space.

[0009] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention discloses an aortic covered stent, comprising a main covered stent and a branch covered stent; the main covered stent is provided with a mounting port, the mounting port being sleeved by the branch covered stent; the branch covered stent comprises an external port and an internal port, the external port being located on the outside of the main covered stent; the edge of the external port is connected to the mounting port via a first diaphragm on the side near the upstream, the first diaphragm having a first outer convex surface and a first inner concave surface arranged oppositely, the first outer convex surface facing away from the mounting port; the internal port is located inside the main covered stent, the edge of the internal port is connected to the mounting port via a second diaphragm on the side near the downstream, the second diaphragm having a second outer convex surface and a second inner concave surface arranged oppositely, the second outer convex surface facing away from the mounting port; the first diaphragm and the second diaphragm are connected via a third diaphragm, the first diaphragm, the second diaphragm and the third diaphragm close the mounting port.

[0010] Preferably, half of the edge of the outer port is connected to the first diaphragm, and half of the edge of the inner port is connected to the second diaphragm.

[0011] Preferably, it includes a plurality of the branch coated stents, which are arranged side by side in sequence along the direction from one end of the main coated stent near the ascending aorta to one end near the descending aorta, and the first diaphragm of the latter branch coated stent is connected to the second diaphragm of the former branch coated stent.

[0012] Preferably, the main membrane-grafting support is provided with a membrane-to-be-ruptured area, the middle of which has a portion to be ruptured for rupturing the membrane to form a circular membrane-grafting opening, and the membrane-to-be-ruptured area is provided with a support mechanism for maintaining the circular shape of the membrane-grafting opening.

[0013] Preferably, three areas to be ruptured are included, the installation port and one of the areas to be ruptured are arranged side by side in sequence along the direction from one end of the main covered stent near the ascending aorta to one end near the descending aorta, and the other two areas to be ruptured are arranged on both sides of the area between the installation port and the other area to be ruptured.

[0014] Preferably, the support mechanism includes one or more supporting coil springs. When there is only one supporting coil spring, the portion of the film to be broken in the area to be broken is located in the middle area of ​​the supporting coil spring. When there are multiple supporting coil springs, the middle parts of the multiple supporting coil springs overlap, and the portion of the film to be broken in the area to be broken is located in the overlapping middle area of ​​the multiple supporting coil springs.

[0015] Preferably, the support mechanism also includes a plurality of support loops arranged in sequence from the inside to the outside, the support loops are coaxially arranged with the part to be broken, the part to be broken is arranged in the innermost support loop, and radially arranged connecting rays extend from the innermost support loop, and the connecting rays are interspersed with the support coil spring and the support loop.

[0016] Preferably, the support mechanism includes two support coil springs, which are mirror-imaged and partially overlap in the middle. A support loop passes through every two relative intersections of the two support coil springs, and the innermost support loop is located in the overlapping area in the middle of the two support coil springs.

[0017] Preferably, the main stent graft and the branch stent graft both include a cylindrical graft and a skeleton for supporting the graft.

[0018] The present invention also discloses an aortic stent graft assembly, comprising a connecting stent graft and the above-mentioned aortic stent graft, wherein the connecting stent graft is used to establish a blood flow channel between a branch blood vessel and a branch stent graft of the aortic stent graft.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] In the present invention, the main stent graft and the branch stent graft are connected by a first diaphragm and a second diaphragm. The first diaphragm and the second diaphragm form a parallelogram-like structure when viewed from the front. By utilizing the instability of the parallelogram, the branch stent graft can swing flexibly, which facilitates the alignment of the outer port of the branch stent graft with the opening of the branch blood vessel. In the process of installing the aortic stent graft into the outer tube of the conveyor, the branch stent graft deflects toward the second inner concave surface and then rotates to a position where the axis is parallel to the axis of the main stent graft, which facilitates the compression of the aortic stent graft. ; In addition, because the aortic covered stent does not have a pre-installed guidewire or catheter, the overall compressed volume is smaller and can be loaded into the outer tube of a small-caliber conveyor; and when the guidewire passes through the interior of the main covered stent to the branch blood vessel opening for superselection, the guidewire touches the second outer convex surface of the branch covered stent. The second outer convex surface is similar to a slope, which can form a slide effect, making it easier for the guidewire to be selected into the branch covered stent, and there is no need to cut open the healthy branch blood vessel for guidewire capture; an aortic covered stent is formed that does not require cutting the patient's healthy blood vessels, has a wide range of applications, is highly flexible, and occupies a small compressed space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the analysis of these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the front view of the aortic stent graft according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the aortic stent graft according to an embodiment of the present invention;

[0024] Figure 3 Schematic cross-sectional view of the aortic stent graft (branch stent graft) in an embodiment of the present invention;

[0025] Figure 4 Schematic three-dimensional cross-sectional view of the aortic stent graft (branch stent graft) in an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the three-dimensional structure of a branch stent graft in an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the support mechanism (double supporting coil springs) in an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the structure of the support mechanism (double supporting coil springs, supporting loops, connecting loops, and connecting rays) in an embodiment of the present invention;

[0029] Figure 8 Schematic diagram of the interlacing method of connecting rays in an embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the three-dimensional structure of the aortic stent graft (double-branch stent graft) in an embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the three-dimensional structure of a double-branch covered stent in an embodiment of the present invention;

[0032] Figure 11 The shape of the hole after the membrane is broken in the membrane-breaking area without a supporting mechanism using the in-situ windowing technology;

[0033] Figure 12 Schematic diagram of the unfolded structure of the integrally formed second diaphragm and third diaphragm in an embodiment of the present invention;

[0034] Figure 13 Schematic diagram of the expanded structure of the first diaphragm in an embodiment of the present invention.

[0035] Explanation of the accompanying reference numerals: 1. Main coated bracket; 2. Branch coated bracket; 3. First diaphragm; 4. Second diaphragm; 5. Third diaphragm; 6. First outer convex surface; 7. First inner concave surface; 8. Second outer convex surface; 9. Second inner concave surface; 10. Support mechanism; 11. Support coil spring; 12. Support loop; 13. Connecting ray; 14. Coating; 15. Skeleton; 16. Part to be broken. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] The object of the present invention is to provide an aortic covered stent and an aortic covered stent assembly to solve the problems existing in the prior art. The first diaphragm and the second diaphragm form a structure similar to a parallelogram when viewed from the front. By utilizing the instability of the parallelogram, the branch covered stent can swing flexibly, which is convenient for the outer port of the branch covered stent to be aligned with the opening of the branch blood vessel. In the process of loading the aortic covered stent into the outer tube of the conveyor, the branch covered stent deflects toward the second inner concave surface, and then rotates to a position where the axis is as parallel as possible to the axis of the main covered stent, which is convenient for the compression of the aortic covered stent. In the process of guidewire superselection, the guidewire touches the second outer convex surface of the branch covered stent. The second outer convex surface is similar to a slope and can form a slide effect, making it easier for the guidewire to be selected into the branch covered stent. There is no need to cut the healthy branch blood vessel for guidewire capture, forming an aortic covered stent that does not require cutting the patient's healthy blood vessel, has a wide range of applications, is highly flexible, and has a small compressed space.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] like Figures 1 to 13As shown, this embodiment provides an aortic covered stent, including a main covered stent 1 and a branch covered stent 2 (at least one). The main covered stent 1 is provided with a mounting port, and the mounting port is for the branch covered stent 2 to be sleeved inside. The branch covered stent 2 includes an external port and an internal port, the external port is located outside the main covered stent 1, and the internal port is located inside the main covered stent 1. The edge of the external port is connected to the mounting port through a first diaphragm 3 on the upstream side. Taking the aortic arch as an example, the upstream side is the side near the ascending aorta. The first diaphragm 3 has a first outer convex surface 6 and a first inner concave surface 7 that are relatively arranged, and the first outer convex surface 6 faces away from the mounting port. The edge of the inner port is connected to the mounting port through a second diaphragm 4 on the downstream side. Taking the aortic arch as an example, the upstream side is the side near the descending aorta. The second diaphragm 4 has a second outer convex surface 8 and a second inner concave surface 9 that are relatively arranged, and the second outer convex surface 8 faces away from the mounting port. The first diaphragm 3 and the second diaphragm 4 are connected by the third diaphragm 5, and the first diaphragm 3, the second diaphragm 4 and the third diaphragm 5 close the installation port of the main membrane-covered bracket 1. Preferably, the material of the first diaphragm 3, the second diaphragm 4 and the third diaphragm 5 is the same as the material of the membrane 14 of the main membrane-covered bracket 1. The first diaphragm 3, the second diaphragm 4 and the third diaphragm 5 can be independent diaphragms. During production, one end of the first diaphragm 3 is sewn to one end of the second diaphragm 4 through a third diaphragm 5, and the other end of the first diaphragm 3 is sewn to the other end of the second diaphragm 4 through a third diaphragm 5. Alternatively, the first diaphragm 3 and the third diaphragm 5 can be integrally formed during production, and the third diaphragm 5 itself is the two ends of the first diaphragm 3, forming two independent diaphragms with the second diaphragm 4. During production, it is only necessary to sew the third diaphragm 5 and the second diaphragm 4 together, which can reduce the suturing area compared to the three being independent diaphragms. Alternatively, the second diaphragm 4 and the third diaphragm 5 can be integrally formed during production (such as Figure 12 As shown), the third diaphragm 5 itself is the two ends of the second diaphragm 4, and the first diaphragm 3 (as shown Figure 13 As shown in FIG, the third diaphragm 5 and the first diaphragm 3 are formed into two independent diaphragms. When manufacturing, it is only necessary to sew the third diaphragm 5 and the first diaphragm 3 together to reduce the sew area.

[0041] refer to Figure 3As shown, the first diaphragm 3 and the second diaphragm 4 form a parallelogram-like structure in a frontal view. By utilizing the instability of the parallelogram, the branch stent graft 2 can swing flexibly, mainly by rotating the outer port toward or away from the second inner concave surface 9, while the inner port rotates away from or toward the first inner concave surface 7. The first inner concave surface 7 and the second inner concave surface 9 provide a rotation space for rotation, which facilitates the alignment of the outer port of the branch stent graft 2 with the opening of the branch blood vessel. In addition, in the process of loading the aortic stent graft into the outer tube of the conveyor, the branch stent graft 2 deflects toward the second inner concave surface 9 and then rotates to a position where the axis is parallel to the axis of the main stent graft 1, which facilitates the compression of the aortic stent graft. In addition, because the aortic stent graft does not have a pre-installed guide wire or catheter, the overall compressed volume is smaller and can be loaded into the outer tube of a small-caliber conveyor. When the guidewire passes through the interior of the main stent graft 1 toward the branch vessel opening, it contacts the second convex surface 8 of the branch stent graft 2. This second convex surface 8 is similar to an inclined surface, creating a slide effect, making it easier for the guidewire to be inserted into the branch stent graft 2, eliminating the need to cut open the healthy branch vessel for guidewire capture. This results in an aortic stent graft that does not require cutting open the patient's healthy blood vessels, has a wide range of applications, is highly flexible, and takes up a small amount of space.

[0042] In one embodiment, half of the edge of the outer port of the branch stent graft 2 (half of the circumference) is connected to the first diaphragm 3, and half of the edge of the inner port (half of the circumference) is connected to the second diaphragm 4. The first convex surface 6 of the first diaphragm 3 and the second convex surface 8 of the second diaphragm 4 both have the outer shape of half a cone.

[0043] In one embodiment, the invention comprises a plurality of branch stent grafts 2 (at least two), which are arranged side by side in a sequence from one end proximal to the ascending aorta to one end proximal to the descending aorta of the main stent graft 1, with the first diaphragm 3 of the latter branch stent graft 2 connected to the second diaphragm 4 of the previous branch stent graft 2. Preferably, the plurality of branch stent grafts 2 are arranged along the central axis of the main stent graft 1.

[0044] In one embodiment, a plurality of branch stent grafts 2 (at least two) are included, and the plurality of branch stent grafts 2 are arranged side by side in a direction from one end proximal to the ascending aorta to one end proximal to the descending aorta of the main stent graft 1, with a distance between each subsequent branch stent graft 2 and the previous branch stent graft 2. Preferably, the plurality of branch stent grafts 2 are arranged along the central axis of the main stent graft 1.

[0045] In one embodiment, the main stent graft 1 is provided with a region to be ruptured. The central portion of the region has a rupture portion 16 for rupturing the membrane to form a graft opening. A support mechanism 10 is provided within the region to maintain the shape of the graft opening. The graft opening is used to implant and connect the stent graft, forming a blood flow channel with the branch vessel opening.

[0046] There are three branch blood vessels in the aortic arch (the brachiocephalic branch, the left common carotid branch, and the left subclavian branch). If two or three of the branch blood vessels are diseased, it is necessary to consider using a device with multiple branch covered stents 2 for intravascular treatment. This creates a new problem. The relative distance between the multiple branch covered stents 2 needs to be consistent with the distance between the branch blood vessel openings. Otherwise, poor alignment or inability to align will still occur. The distances between the branch blood vessel openings of different patients are different, so it is difficult for one product to be adapted to multiple patients. In this embodiment, an area to be ruptured is added, and the structure of branch covered stent 2 + in situ ruptured membrane (area to be ruptured) is used. There is no need to consider the spacing between the patient's branch blood vessel openings. When the branch covered stent 2 is well aligned, subsequent in situ rupture surgery can be performed at the area to be ruptured to form a covered opening for implanting and connecting the covered stent.

[0047] In addition, although the existing stent graft in situ fenestration technology does not need to consider the problem of branch vessel opening alignment (because the main stent graft 1 itself does not have a graft opening), it also has a serious defect: the graft is usually made of two materials, one is fabric (mostly polyester) and the other is expanded polytetrafluoroethylene. Regardless of the material, the shape of the graft after it is broken (expanded by the balloon) is not a perfect circle (such as Figure 11 The stent graft may be burred and may even have many burrs, which may cause internal leakage after the stent graft is connected to the hole, leading to surgical failure. In this embodiment, by adding a support mechanism 10, the support mechanism 10 can ensure that after the membrane 14 of the to-be-ruptured portion 16 of the membrane to be ruptured area is ruptured, the rupture area (membrane opening) remains a regular circle, so that the stent graft is well fitted with the membrane opening, avoiding the occurrence of internal leakage.

[0048] Note: The process of in situ fenestration technology is roughly as follows: first, the main covered stent 1 is implanted into the aortic arch to temporarily close the opening of the branch vessel. A small hole is made in the covering 14 of the main covered stent 1 by mechanical or laser rupture. A guide wire is inserted into the small hole. The balloon is pressurized (pressurization causes the balloon to expand and increase its diameter) to expand the covering opening. Then, the connecting covered stent is implanted into the branch vessel, and the other part of the connecting covered stent is squeezed with the covering opening to form a closure.

[0049] In one embodiment, three membrane rupture regions are included, with the mounting port and one of the membrane rupture regions being arranged side by side in a direction from the end proximal to the ascending aorta to the end proximal to the descending aorta of the main stent graft 1. The other two membrane rupture regions are located on both sides of the area between the mounting port and the other membrane rupture region.

[0050] In one embodiment, the support mechanism 10 includes a support coil spring 11, which is fixed within the membrane-to-be-ruptured region. A portion 16 of the membrane-to-be-ruptured region is located in the middle region of the support coil spring 11. When the membrane-to-be-ruptured portion 16 of the membrane-to-be-ruptured region utilizes a membrane-rupturing technique to create a circular opening in the graft for implantation and formation of a blood flow channel, the elastic restoring force of the support coil spring 11 maintains the circular shape of the graft opening. The support coil spring 11 is fixed to the graft 14 of the membrane-to-be-ruptured region. Preferably, the support coil spring 11 is located within the main stent graft 1.

[0051] In one embodiment, the support mechanism 10 includes a plurality of support coils 11. Multiple support coils 11 refer to two or more support coils 11. The central portions of the plurality of support coils 11 partially overlap, and the to-be-ruptured portion 16 of the to-be-ruptured membrane region is located within the overlapping central portion of the plurality of support coils 11. Multiple support coils 11 can increase the force required to maintain the circular shape of the membrane graft opening compared to a single support coil 11. The support coils 11 are fixed to the membrane graft 14 in the to-be-ruptured membrane region. Preferably, the support coils 11 are located within the main stent graft 1.

[0052] In one embodiment, the support mechanism 10 further comprises a plurality of support loops 12, arranged sequentially from the inside to the outside. The support loops 12 are coaxially arranged with the portion to be ruptured 16, which is disposed within the innermost support loop 12. A plurality of connecting rays 13 extend from the innermost support loop 12, arranged radially and interlaced with the support coil springs 11 and the support loops 12. The support loops 12 and connecting rays 13 are sewn onto the film 14 in the area to be ruptured. The pull of the support loops 12 and connecting rays 13, in conjunction with the support coil spring 11, further enhances the effectiveness of maintaining the film opening.

[0053] In one embodiment, the support mechanism 10 includes two support coil springs 11 (refer to Figures 6 to 8The support coil spring 11 in the middle dashed line and the support coil spring 11 in the solid line are two mirror images and partially overlap in the middle. At this time, each spiral line of the two support coil springs 11 has two relative intersections, and all the intersections are located on the mirror axis of the two support coil springs 11. There is a support loop line 12 passing through the two relative intersections on each spiral line of the two support coil springs 11, so that the two support coil springs 11 and the support loop line 12 converge at the same point, greatly improving the pulling force and maintaining the circular shape of the membrane opening formed at the part to be broken 16. The innermost support loop line 12 is located in the middle overlapping area of ​​the two support coil springs 11. The connecting ray 13 is interspersed with the two support coil springs 11 and the support loop line 12. At the position where the connecting ray 13 intersects, the support loop line 12 is located between the two support coil springs 11.

[0054] In one embodiment, both the main stent graft 1 and the branch stent graft 2 include a membrane 14 and a skeleton 15. The membrane 14 is cylindrical, and the skeleton 15 is used to support the membrane 14 and maintain its cylindrical shape. The skeleton 15 is typically made of a shape memory alloy, and the membrane 14 is typically made of an elastic material, such as polyester (PET).

[0055] Example 2

[0056] like Figures 1 to 13 As shown, this embodiment provides an aortic stent graft assembly, including a connecting stent graft and the aortic stent graft in Example 1. The connecting stent graft is used to establish a blood flow channel between a branch vessel and a branch stent graft 2 of the aortic stent graft.

[0057] In one embodiment, the connected stent graft is further used to establish a blood flow channel between the branch blood vessel and the stent graft opening ruptured at the portion to be ruptured 16 .

[0058] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An aortic stent graft, characterized in that: It comprises a main body coated bracket and a branch coated bracket; the main body coated bracket is provided with a mounting port, and the mounting port is for the branch coated bracket to be sleeved inside; the branch coated bracket comprises an external port and an internal port, and the external port is located on the outside of the main body coated bracket; the edge of the external port is connected to the mounting port through a first diaphragm on the side near the upstream, and the first diaphragm has a first outer convex surface and a first inner concave surface arranged opposite to each other, and the first outer convex surface faces away from the mounting port; the inner port is located inside the main body coated bracket, and the edge of the inner port is connected to the mounting port through a second diaphragm on the side near the downstream The second diaphragm has a second outer convex surface and a second inner concave surface arranged opposite to each other, and the second outer convex surface faces away from the mounting port; the first diaphragm and the second diaphragm are connected by a third diaphragm, and the first diaphragm, the second diaphragm and the third diaphragm close the mounting port; half of the edge of the outer port is connected to the first diaphragm, and half of the edge of the inner port is connected to the second diaphragm; the first diaphragm and the second diaphragm form a parallelogram-like structure in a front view, and the branch coated bracket can swing flexibly by utilizing the instability of the parallelogram structure.

2. The aortic stent graft according to claim 1, characterized in that: It comprises a plurality of branch stent grafts, which are arranged side by side in sequence from one end of the main stent graft near the ascending aorta to one end near the descending aorta, and the first diaphragm of the latter branch stent graft is connected to the second diaphragm of the former branch stent graft.

3. The aortic stent graft according to claim 1, characterized in that: The main membrane-covering bracket is provided with a membrane-to-be-ruptured area, the middle of which has a portion to be ruptured, which is used to rupture the membrane to form a circular membrane-covering opening, and the membrane-to-be-ruptured area is provided with a support mechanism for maintaining the circular shape of the membrane-covering opening.

4. The aortic stent graft according to claim 3, characterized in that: It comprises three areas to be ruptured membranes, the installation port and one of the areas to be ruptured membranes are arranged side by side in succession along the direction from one end of the main covered stent near the ascending aorta to one end near the descending aorta, and the other two areas to be ruptured membranes are arranged on both sides of the area between the installation port and the other area to be ruptured membranes.

5. The aortic stent graft according to claim 3 or 4, characterized in that: The support mechanism includes one or more supporting coil springs. When there is only one supporting coil spring, the portion of the film to be ruptured in the area to be ruptured is located in the middle area of ​​the supporting coil spring. When there are multiple supporting coil springs, the middle parts of the multiple supporting coil springs overlap, and the portion of the film to be ruptured in the area to be ruptured is located in the overlapping middle area of ​​the multiple supporting coil springs.

6. The aortic stent graft according to claim 5, characterized in that: The support mechanism also includes a plurality of support loops arranged in sequence from the inside to the outside, the support loops are coaxially arranged with the part to be broken, the part to be broken is arranged in the innermost support loop, and radially arranged connecting rays extend from the innermost support loop, and the connecting rays are interspersed with the support coil spring and the support loop.

7. The aortic stent graft according to claim 6, characterized in that: The support mechanism includes two support coil springs, which are mirror-imaged and partially overlap in the middle. A support loop passes through every two opposite intersections of the two support coil springs, and the innermost support loop is located in the overlapping area in the middle of the two support coil springs.

8. The aortic stent graft according to claim 1, characterized in that: The main stent graft and the branch stent graft both include a cylindrical graft and a skeleton for supporting the graft.

9. An aortic stent graft assembly, characterized in that: It comprises a connecting stent graft and the aortic stent graft according to any one of claims 1 to 8, wherein the connecting stent graft is used to establish a blood flow channel between a branch blood vessel and a branch stent graft of the aortic stent graft.

Images