Abdominal aortic aneurysm covered stent

Abstract

The present invention discloses an abdominal aortic aneurysm covered stent, comprising a main stent and a secondary stent respectively arranged, the main stent comprising a first cylindrical portion and a second cylindrical portion, the first cylindrical portion and the second cylindrical portion being integrally formed, a partition portion being arranged inside the first cylindrical portion, the partition portion dividing the first cylindrical portion into two semi-cylindrical cavities, the second cylindrical portion being integrally formed with the lower edge of one of the semi-cylindrical cavities, the secondary stent comprising a circular tube portion and a semi-cylindrical tube portion fitted with the semi-cylindrical cavity, the semi-cylindrical tube portion being integrally formed with the circular tube portion, a hook being arranged at the edge of the semi-cylindrical tube portion, the hook being arranged at one side close to the partition portion, the upper edge of the first cylindrical portion being arranged with a first fixed frame, and two first fixed frames being arranged. The covered stent can effectively solve the problem of easy movement and falling off existing covered stents and the problem of difficult installation of existing secondary stents.

Description

Technical Field

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

[0002] Abdominal aortic aneurysm is a common vascular disease in clinical practice. If not treated in time, it can lead to life-threatening due to the instantaneous rupture of the aortic aneurysm. The commonly used treatment method in clinical practice is interventional therapy. The principle of this method is to pre-load the stent graft into the sending device, insert it into the lesion site of the abdominal aorta through the femoral artery, and accurately release the stent graft at the lesion site under the monitoring of X-ray fluoroscopy equipment. After the stent graft is implanted, the pressure inside the aortic wall at the lesion site can be effectively reduced, thereby avoiding the rupture of blood vessels near the abdominal aortic aneurysm.

[0003] At present, in this industry, stent grafts used for the treatment of abdominal aortic aneurysms are usually made of nickel-titanium alloy materials, but they are also made of stainless steel and other biocompatible materials. From a structural point of view, there are two main types, namely straight-tube type and Y-type. Among them, the Y-type stent graft is more commonly used. When placing it, it is necessary to make incisions on the left and right femoral arteries at the same time, and introduce the stent graft in steps, so the requirements are more stringent.

[0004] There are two technical difficulties in the interventional treatment of abdominal aortic aneurysm. The first is that the implanted covered stent may move and fall off from the desired position (initial position) after being installed during the patient's later survival. The second is that the "leg insertion" process is complicated, and it is not easy to insert the secondary stent into the opening of the Y-shaped covered stent, which leads to a problem of prolonged operation time. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an abdominal aortic aneurysm covered stent, which can effectively solve the problem of easy movement and falling off of the existing covered stents and the problem that the existing secondary stents are difficult to install.

[0006] To achieve the above purpose, the technical solution adopted by the present invention to solve the technical problem is:

[0007] A covered stent for an abdominal aortic aneurysm comprises a main stent and a secondary stent which are arranged separately. The main stent comprises a first cylindrical portion and a second cylindrical portion, the first cylindrical portion and the second cylindrical portion are integrally formed, a partition is arranged inside the first cylindrical portion, the partition divides the first cylindrical portion into two semi-cylindrical cavities, the second cylindrical portion is integrally formed with the lower edge of one of the semi-cylindrical cavities, the secondary stent comprises a circular tube portion and a semi-cylindrical tube portion fitted with the semi-cylindrical cavity, the semi-cylindrical tube portion is integrally formed with the circular tube portion, a hook is arranged on the edge of the semi-cylindrical tube portion, the hook is arranged on a side close to the partition, a first fixed frame is arranged on the upper edge of the first cylindrical portion, and two first fixed frames are arranged.

[0008] The beneficial effects of the above scheme are as follows: the first cylindrical part is placed in the abdominal aorta between the renal artery and the abdominal aortic aneurysm by means of a conveying device, and then slowly released so that the first cylindrical part is completely fitted with the abdominal aorta, the position of the first cylindrical part is adjusted by means of a releasing device so that the height of the first fixed frame on the upper part of the first cylindrical part matches the height of the renal artery, the first fixed frame is released into the left and right renal arteries respectively, and the main stent is "hung" in the left and right renal arteries by means of the first fixed frame, thereby preventing the main stent from falling off or moving downward; and then The secondary stent is inserted into the other semi-cylindrical cavity of the first cylindrical part through the release device, and then released. After the release, the semi-cylindrical tube of the secondary stent just fits with the semi-cylindrical cavity in the first cylindrical part. The secondary stent is hung on the partition part through the hook arranged thereon to prevent the secondary stent from falling off from the semi-cylindrical cavity. At this time, the blood in the abdominal aorta enters through the first cylindrical part and is divided into two streams. The two streams of blood flow out through the second cylindrical part and the circular tube part respectively. In this way, the blood can be isolated from the abdominal aortic aneurysm to achieve the purpose of treatment. Since the first cylindrical part is arranged in the intact abdominal aorta above the abdominal aortic aneurysm, when the secondary stent is installed, after the guide wire enters the abdominal aortic aneurysm, there is only one upward path. This design facilitates the installation of the secondary stent and can greatly shorten the installation time.

[0009] Further, the shape of the semi-cylindrical tube portion is the same as that of the semi-cylindrical cavity.

[0010] The beneficial effect of adopting the above scheme is that the design can greatly improve the fit between the semi-cylindrical tube and the semi-cylindrical cavity, so that the blood can flow out completely through the semi-cylindrical tube, avoiding a small amount of blood leaking into the abdominal aortic aneurysm.

[0011] Furthermore, the main circuit bracket and the secondary circuit bracket are both made of a memory alloy skeleton and a coating material, and the memory alloy skeleton is sewn to the outside or inside of the coating material.

[0012] The beneficial effects of adopting the above scheme are as follows: the main stent and the secondary stent are made by 3D printing technology, the sizes of the main stent and the secondary stent are consistent with the patient's blood vessel diameter, and after installation and release, the main stent can fit perfectly with the patient's abdominal aorta, and the secondary stent can fit perfectly with the main stent, avoiding blood exposure and improving the treatment effect.

[0013] Furthermore, an inverted V-shaped second fixing frame is arranged on the upper edge of the main road bracket, the second fixing frame is arranged on one side of the second cylindrical portion, and barbs are arranged on the outer side of the second fixing frame.

[0014] The beneficial effects of adopting the above scheme are as follows: the two ends of the second fixing frame are connected to the memory alloy stent, and when the main stent is released at the accurate position in the abdominal aorta, the second fixing frame is released, and the barbs arranged on it penetrate into the inner wall of the blood vessel, thereby fixing the main stent and preventing the main stent from falling off or moving downward. The fixing effect of the main stent is improved by the joint action of the first fixing frame and the second fixing frame. The joint action of the two can also reduce the force borne by a single device during fixation, thereby reducing damage to the blood vessel while improving the fixing effect.

[0015] Furthermore, an inverted V-shaped second fixing frame is also provided on the upper edge of the semi-cylindrical tube portion. The second fixing frame is provided on the arc-shaped edge of the semi-cylindrical tube portion, and barbs are provided on the second fixing frame.

[0016] The beneficial effects of adopting the above scheme are: the fixing effect of the secondary bracket is improved by fixing the secondary bracket through the second fixing frame and the joint action of the second fixing frame and the hook.

[0017] Furthermore, the memory alloy skeleton is configured to be in a corrugated shape.

[0018] The beneficial effect of adopting the above scheme is that when the patient bends over to move, the corrugated memory alloy skeleton has a certain plasticity and blood circulation will not be blocked.

[0019] Furthermore, the first fixing frame is disposed in the renal artery, and the angle between the first fixing frame and the first cylindrical portion is consistent with the angle between the renal artery and the abdominal aorta.

[0020] The beneficial effect of adopting the above scheme is that after the first fixed skeleton printed by 3D printing technology is released, the angle between it and the first cylinder can be completely consistent with the angle between the renal artery and the abdominal aorta, so that the first fixed skeleton fits the lower inner wall of the renal artery, thereby improving the fixation effect of the main stent.

[0021] Furthermore, two positioning points are arranged on the first cylindrical portion, and the positioning points are respectively arranged at the upper edges of the first cylindrical portion on both sides of the partition portion.

[0022] The beneficial effect of adopting the above scheme is: the release position of the main road bracket is determined by the positioning point, thereby improving the accuracy of the release position.

[0023] Furthermore, positioning points are also arranged on the side wall of the semi-cylindrical tube portion.

[0024] The beneficial effect of adopting the above solution is: the accuracy of the release position of the secondary support is ensured through the positioning point.

[0025] The beneficial effects produced by the present invention are:

[0026] The main stent in the present invention includes a first cylindrical part and a second cylindrical part. A partition is provided in the first cylindrical part to divide the first cylindrical part into two semi-cylindrical cavities. During installation, the first cylindrical part is placed into the intact abdominal aorta above the abdominal aortic aneurysm. At this time, the secondary stent has only one passage when being inserted, and the secondary stent can be quickly and accurately inserted into the remaining semi-cylindrical cavity, greatly shortening the operation time.

[0027] A first fixed frame is arranged on the first cylindrical portion, and the position of the first fixed frame is the same as that of the renal artery, and is used to fix the main stent. A second fixed frame is also arranged on the upper edge of the first cylindrical portion and the semi-cylindrical tube portion. The first fixed frame and the second fixed frame cooperate with each other to improve the fixing effect of the main stent and the secondary stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the main road support of the present invention;

[0029] Figure 2 It is a schematic structural diagram of the stent graft of the present invention after installation in the abdominal aorta;

[0030] Figure 3 This is a schematic diagram of the structure of the abdominal aorta covered stent;

[0031] Figure 4 is a schematic diagram of the top view of the structure of the first cylindrical part;

[0032] Figure 5 is a structural schematic diagram of the secondary road support;

[0033] Figure numerals: 1. first cylindrical portion; 2. second cylindrical portion; 3. partition portion; 4. semi-cylindrical cavity; 5. circular tube portion; 6. semi-cylindrical tube portion; 7. hook; 8. first fixed frame; 9. memory alloy frame; 10. second fixed frame; 11. barb; 12. positioning point. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0035] In one embodiment of the present invention, Figure 1-5 As shown, a stent graft for abdominal aortic aneurysm is provided, including a main stent and a secondary stent respectively arranged, and preferably, the main stent and the secondary stent are both made of a memory alloy skeleton 9 and a coating material, and the memory alloy skeleton 9 is sutured to the outside or inside of the coating material. Optimally, the memory alloy skeleton 9 is arranged in a corrugated shape.

[0036] The main road bracket includes a first cylindrical portion 1 and a second cylindrical portion 2, and the first cylindrical portion 1 and the second cylindrical portion 2 are integrally formed. Optimally, an inverted V-shaped second fixed frame 10 is provided on the upper edge of the main road bracket, and the second fixed frame 10 is provided on one side of the second cylindrical portion 2. Barbs 11 are provided on the outer side of the second fixed frame 10.

[0037] A partition 3 is provided inside the first cylindrical portion 1 , and the partition 3 divides the first cylindrical portion 1 into two semicircles. Optimally, two positioning points 12 are provided on the first cylindrical portion 1 , and the positioning points 12 are respectively arranged at the upper edge of the first cylindrical portion 1 on both sides of the partition 3 .

[0038] The second cylindrical portion 2 is integrally formed with the lower edge of one of the semi-cylindrical cavities 4, and the secondary support includes a circular tube portion 5 and a semi-cylindrical tube portion 6 fitted with the semi-cylindrical cavity 4, and the semi-cylindrical tube portion 6 is integrally formed with the circular tube portion 5, and optimally, the shape of the semi-cylindrical tube portion 6 is the same as that of the semi-cylindrical cavity 4. Optimally, an inverted V-shaped second fixing frame 10 is also provided on the upper edge of the semi-cylindrical tube portion 6, and the second fixing frame 10 is provided on the arc-shaped edge of the semi-cylindrical tube portion 6, and a barb 11 is provided on the second fixing frame 10.

[0039] A hook 7 is provided at the edge of the semi-cylindrical tube 6, and the hook 7 is provided on the side close to the partition 3. A first fixing frame 8 is provided at the upper edge of the first cylindrical portion 1. Two first fixing frames 8 are provided, and the first fixing frame 8 is integrally formed with a memory alloy frame 9 closest thereto. Optimally, the first fixing frame 8 is provided in the renal artery, and the angle between the first fixing frame 8 and the first cylindrical portion 1 is consistent with the angle between the renal artery and the abdominal aorta. Optimally, a positioning point 12 is also provided on the side wall of the semi-cylindrical tube 6.

[0040] The use process of the above structure is as follows: the first cylindrical part 1 of the main stent is placed in the intact abdominal aorta between the renal artery and the abdominal aortic aneurysm through a conveying device, and then slowly released so that the first cylindrical part 1 is completely fitted with the abdominal aorta, and the position of the first cylindrical part 1 is adjusted by the position of the positioning point 12 through the release device, so that the first fixed frame 8 on the upper part of the first cylindrical part 1 is released into the left and right renal arteries respectively, and the main stent is "hung" in the left and right renal arteries through the first fixed frame 8, thereby preventing the main stent from falling off or moving downward, and then releasing the second fixed frame 10 so that the barbs 11 on the second fixed frame 10 pierce the inner wall of the blood vessel, further improving the fixation of the main stent. Then, the secondary stent is inserted into the other semi-cylindrical cavity 4 of the first cylindrical portion 1 through the releasing device, the releasing position is found through the positioning point 12, and then released. After the release, the semi-cylindrical tube portion 6 of the secondary stent is just in contact with the semi-cylindrical cavity 4 in the first cylindrical portion 1, and the secondary stent is hung on the partition portion 3 through the hook arranged thereon to prevent the secondary stent from falling off from the semi-cylindrical cavity 4, and then the second fixed frame 10 on the upper part of the secondary stent is released, so that the barbs 11 pierce the inner wall of the blood vessel, further improving the fixing effect of the secondary stent. At this time, the blood in the abdominal aorta enters the first cylindrical portion 1 and is divided into two streams, and the two streams of blood flow out through the second cylindrical portion 2 and the circular tube portion 5 respectively. In this way, the blood can be isolated from the abdominal aortic aneurysm to achieve the purpose of treatment. Since the first cylindrical portion 1 is disposed in the intact abdominal aorta above the abdominal aortic aneurysm, when installing the secondary stent, after the guide wire enters the abdominal aortic aneurysm, there is only one upward path. This design facilitates the installation of the secondary stent and can greatly shorten the installation time.

Claims

1. A stent graft for abdominal aortic aneurysm, characterized in that: The invention comprises a main road bracket and a secondary road bracket which are respectively arranged, wherein the main road bracket comprises a first cylindrical part (1) and a second cylindrical part (2), wherein the first cylindrical part (1) and the second cylindrical part (2) are integrally formed, a partition part (3) is arranged inside the first cylindrical part (1), and the partition part (3) divides the first cylindrical part (1) into two semi-cylindrical cavities (4), and the second cylindrical part (2) is integrally formed with the lower edge of one of the semi-cylindrical cavities (4); the secondary road bracket comprises a circular tube part (5) and a semi-cylindrical tube part (6) which fits the semi-cylindrical cavity (4), and the semi-cylindrical tube part (6) is integrally formed with the circular tube part (5), and a hook (7) is arranged on the edge of the semi-cylindrical tube part (6), and the hook (7) is arranged on a side close to the partition part (3); a first fixing frame (8) is arranged on the upper edge of the first cylindrical part (1), and two first fixing frames (8) are arranged; Wherein, an inverted V-shaped second fixing frame (10) is provided at the upper edge of the main road bracket, the second fixing frame (10) is arranged on one side of the second cylindrical portion (2), and a barb (11) is provided on the outer side of the second fixing frame (10); The upper edge of the semi-cylindrical tube portion (6) is provided with the inverted V-shaped second fixing frame (10), the second fixing frame (10) is arranged on the arc-shaped edge of the semi-cylindrical tube portion (6), and the second fixing frame (10) is provided with the barbs (11); The first fixing frame (8) is arranged in the renal artery, and the angle between the first fixing frame (8) and the first cylindrical portion (1) is consistent with the angle between the renal artery and the abdominal aorta.

2. The abdominal aortic aneurysm stent graft according to claim 1, characterized in that: The shape of the semi-cylindrical tube portion (6) is the same as that of the semi-cylindrical cavity (4).

3. The abdominal aortic aneurysm stent graft according to claim 1, characterized in that: The main circuit bracket and the secondary circuit bracket are both made of a memory alloy skeleton (9) and a coating material, and the memory alloy skeleton (9) is sewn to the outside or inside of the coating material.

4. The abdominal aortic aneurysm stent graft according to claim 3, characterized in that: The memory alloy skeleton (9) is configured to be in a corrugated shape.

5. The abdominal aortic aneurysm stent graft according to claim 1, characterized in that: Two positioning points (12) are arranged on the first cylindrical portion (1), and the positioning points (12) are respectively arranged on the upper edges of the first cylindrical portion (1) on both sides of the partition portion (3).

6. The abdominal aortic aneurysm stent graft according to claim 1, characterized in that: A positioning point (12) is provided on the side wall of the semi-cylindrical tube portion (6).

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