A covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm

Abstract

The present invention discloses a covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm, comprising a main stent and at least one group of movable stents, the main stent comprising a first cylindrical portion and a second cylindrical portion, a vertical partition is arranged in the first cylindrical portion, the vertical partition divides the first cylindrical portion into a first diversion cavity and a second diversion cavity, the cross-sectional area of ​​the first diversion cavity is larger than the cross-sectional area of ​​the second diversion cavity, the second cylindrical portion is integrally formed with the first cylindrical portion and communicated with the first diversion cavity, the movable stent comprises a connecting portion and a diversion portion, the connecting portion and the diversion portion are integrally formed, the connecting portion is arranged in the second diversion cavity, and is tightly fitted with the inner wall of the second diversion cavity. The stent can effectively solve the problem that the existing chimney stents are not tightly fitted between each other and between the chimney stent and the aorta, which is easy to cause blood leakage.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm. Background Art

[0002] Thoracic aortic dissection refers to the blood in the aorta cavity entering the aortic media from the tear in the aortic intima, causing the media to separate and expand along the long axis of the aorta to form a state of separation between the true and false cavities of the aortic wall. The incidence rate is about 5 to 10 cases per million people per year, and the ratio of male to female incidence is 2 to 5:1. It is common in people aged 45 to 70 years old. The mortality rate increases by about 1% per hour within 2 days after the onset of the disease. 65% to 70% die from cardiac tamponade, arrhythmia, etc. in the acute stage, so early diagnosis and treatment are very necessary.

[0003] The traditional treatment for this disease is open-chest total aortic arch artificial vascular replacement (Bental surgery). Since open-chest surgery is extremely traumatic and requires extracorporeal bypass, the surgical risk is enormous. In the past, it was reported that the mortality rate of surgery for this disease was as high as 50%. In order to save the lives of some patients, "chimney" stent implantation has been carried out on the arch. The chimney stent is a traditional circular stent. Single-chimney, double-chimney and triple-chimney stent technology has been used on the arch. However, there are often obvious gaps between the single-chimney, double-chimney and triple-chimney stents and the aortic stent, and between the stent and the aortic blood vessel, resulting in obvious internal leakage and ineffective fit. It cannot well block the dissection rupture or aneurysm, resulting in type 1 internal leakage and serious consequences such as aneurysm rupture. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm, which can effectively solve the problem of loose fit between existing chimney stents and between the chimney stent and the aorta, which easily causes blood internal leakage.

[0005] To achieve the above purpose, the technical solution adopted by the present invention to solve the technical problem is:

[0006] A covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm, comprising a main stent and at least one group of movable stents, the main stent comprising a first cylindrical portion and a second cylindrical portion, a vertical partition is arranged in the first cylindrical portion, the vertical partition divides the first cylindrical portion into a first diversion cavity and a second diversion cavity, the cross-sectional area of ​​the first diversion cavity is larger than the cross-sectional area of ​​the second diversion cavity, the second cylindrical portion is integrally formed with the first cylindrical portion and is connected to the first diversion cavity, the movable stent comprises a connecting portion and a diversion portion, the connecting portion and the diversion portion are integrally formed, the connecting portion is arranged in the second diversion cavity, and is tightly fitted with the inner wall of the second diversion cavity.

[0007] The beneficial effects of adopting the above scheme are as follows: the cross-sectional shapes of the first diversion cavity and the second diversion cavity are both semicircular, the vertical partition is integrally formed with the inner wall of the first cylindrical portion, the connecting portion of the movable bracket is set to be special-shaped, and the shape of all the connecting portions after splicing is consistent with the shape of the second diversion cavity. After the main stent and the movable bracket are released, they fit tightly with the patient's thoracic aorta, left subclavian artery, left common carotid artery and innominate artery.

[0008] When the tumor involves the left subclavian artery, the main stent is placed in the thoracic aorta through the releasing device, so that the main stent fits tightly against the inner wall of the thoracic aorta, and then the movable stent is inserted from the left brachial artery, and after entering the thoracic aorta, it continues to be inserted into the second diversion cavity, so that the connecting part of the movable stent is slowly released in the second diversion cavity, and the connecting part fits tightly against the inner wall of the second diversion cavity. At this time, the blood in the thoracic aorta is diverted, and since the connecting part fits tightly against the second diversion cavity after being released, there is no internal leakage of blood, thereby achieving the therapeutic effect of thoracic aortic aneurysm.

[0009] When the tumor involves the left common carotid artery and the left subclavian artery, the main stent is placed in the thoracic aorta through the releasing device, so that the main stent fits tightly against the inner wall of the thoracic aorta. Then two movable stents are taken, and the two movable stents are respectively inserted into the left brachial artery and the left common carotid artery, and then passed out from the second diversion cavity of the main stent, so that the connection parts of the two movable stents are slowly released in the second diversion cavity, and the two connection parts and the connection parts fit tightly against the inner wall of the second diversion cavity. The shape of the two connection parts after splicing is consistent with the shape of the second diversion cavity. The blood in the thoracic aorta is shunted through this structure to achieve the therapeutic effect.

[0010] When the tumor involves the left common carotid artery, the left subclavian artery and the innominate artery, the main stent is placed in the thoracic aorta through the releasing device, so that the main stent fits tightly against the inner wall of the thoracic aorta, and then three movable stents are taken, and the three movable stents are respectively inserted into the left brachial artery, the left common carotid artery and the right brachial artery, and then passed out from the second diversion cavity of the main stent, so that the connection parts of the three movable stents are slowly released in the second diversion cavity, and the three connection parts and the connection parts fit tightly against the inner wall of the second diversion cavity. The shape of the three connection parts after splicing is consistent with the shape of the second diversion cavity. The blood in the thoracic aorta is shunted through this structure to achieve the therapeutic effect.

[0011] Furthermore, a transverse partition is provided in the second flow guide cavity, which divides the second flow guide cavity into two third flow guide cavities. The connecting parts of the movable brackets are respectively provided in the third flow guide cavities and are tightly fitted with the inner walls of the third flow guide cavities.

[0012] The beneficial effects of adopting the above scheme are as follows: the horizontal partition, the vertical partition and the first cylindrical portion are integrally formed, and the second diversion cavity is divided into two third diversion cavities. The cross-sectional shape of the third diversion cavity is fan-shaped. When the thoracic aortic aneurysm involves the left subclavian artery and the left common carotid artery, the movable stent can be passed through the two third diversion cavities respectively, so that the connecting part of the movable stent is released in the third diversion cavity, and is tightly fitted with the inner wall of the third diversion cavity to prevent blood leakage.

[0013] Furthermore, two transverse partitions are arranged in the second flow guide cavity, which divide the second flow guide cavity into three fourth flow guide cavities. The connecting parts of the movable brackets are respectively arranged in the fourth flow guide cavities and fit tightly with the inner walls of the fourth flow guide cavities.

[0014] The beneficial effects of adopting the above scheme are as follows: the two transverse partitions are respectively integrally formed with the vertical partition and the first cylindrical portion, and the two transverse partitions divide the second diversion cavity into three fourth diversion cavities, wherein the cross-sections of the two fourth diversion cavities are fan-shaped, and the cross-section of the other fourth diversion cavity is a quadrilateral, and the shape of the three fourth diversion cavities after splicing is consistent with the second diversion cavity. When the tumor involves the left common carotid artery, the left subclavian artery and the innominate artery, the movable stent can be respectively passed through the three fourth diversion cavities, and the shape of the connecting portion of the movable stent is respectively consistent with the shape of the fourth diversion cavity, so that the connecting portion of the movable stent is released in the fourth diversion cavity and fits tightly with the inner wall of the fourth diversion cavity, thereby preventing blood leakage and improving the treatment effect.

[0015] Furthermore, the cross section of the guide portion is set to be circular.

[0016] The beneficial effects of adopting the above scheme are as follows: the guide part is set to be circular, and is placed in the left subclavian artery, the left common carotid artery and the innominate artery, so that the guide part fits tightly with the inner walls of the left subclavian artery, the left common carotid artery and the innominate artery, thereby achieving the diversion effect and avoiding blood leakage.

[0017] Furthermore, the main support and the movable support 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.

[0018] The beneficial effects of adopting the above scheme are: after the main stent and the movable stent are installed and released, the main stent can fit perfectly with the patient's thoracic aorta, and the connecting part of the movable stent can fit perfectly with the main stent, avoiding blood exposure and improving the treatment effect.

[0019] Furthermore, the memory alloy skeleton is configured to be in a corrugated shape.

[0020] The beneficial effects of adopting the above scheme are: the corrugated shape has a certain activity and contraction ability, which improves the use effect of the patient during activities.

[0021] Furthermore, a plurality of inverted V-shaped fixing frames are arranged on the upper edge of the main road bracket, and barbs are arranged on the outer sides of the fixing frames.

[0022] The beneficial effect of adopting the above scheme is that the barbs are provided, and after the main stent is released, the barbs can be hung on the thoracic aorta, thereby improving the fixing effect of the main stent.

[0023] Furthermore, a hook is provided on the movable bracket, and the hook is provided on a side close to the vertical partition.

[0024] The beneficial effects of adopting the above scheme are: the hook is set on the connecting part of the movable bracket, the hook and the movable bracket are fixedly connected, and after the movable bracket is slowly released in the main road bracket, the movable bracket is hung on the vertical partition through the hook, thereby improving the fixing effect of the movable bracket.

[0025] The beneficial effects of the above scheme are as follows: in the present invention, a suitable number of movable stents are selected according to the growth position of the tumor, and the movable stents are released in the main stent. The connecting parts of the movable stents are set to be special-shaped, so that the shape of the connecting parts of the movable stents after splicing is consistent with the shape of the second diversion cavity. The blood in the thoracic aorta is shunted through the main stent and the secondary stent to prevent blood from flowing into the tumor, thereby achieving the purpose of treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the stent graft in the thoracic aorta when the tumor involves the left subclavian artery;

[0027] Figure 2 It is a cross-sectional schematic diagram of a main road support provided with vertical partitions;

[0028] Figure 3 It is a schematic diagram of the structure of the stent graft in the thoracic aorta when the tumor involves the left subclavian artery and the left common carotid artery;

[0029] Figure 4 It is a cross-sectional schematic diagram of a main road support provided with a cross partition;

[0030] Figure 5 is a schematic diagram of the structure of the stent graft in the thoracic aorta when the tumor involves the left subclavian artery, the left common carotid artery and the innominate artery;

[0031] Figure 6 It is a cross-sectional schematic diagram of a main road support provided with two transverse partitions;

[0032] Figure 7 A schematic diagram of the three-dimensional structure of the main road support;

[0033] Figure 8 is a schematic diagram of the three-dimensional structure of the movable bracket when the cross section of the connecting portion is fan-shaped;

[0034] Fig. 9 is a schematic diagram of the three-dimensional structure of the movable bracket when the cross section of the connecting portion is a quadrilateral;

[0035] Figure numerals: 1. first cylindrical portion; 2. second cylindrical portion; 3. vertical partition; 4. first flow guide cavity; 5. second flow guide cavity; 6. connecting portion; 7. flow guide portion; 8. horizontal partition; 9. third flow guide cavity; 10. fourth flow guide cavity; 11. memory alloy skeleton; 12. coating material; 13. fixing frame; 14. barb; 15. hook; 16. main road bracket; 17. movable bracket. DETAILED DESCRIPTION

[0036] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0037] In one embodiment of the present invention, Figure 1-9 As shown, a covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm is provided, including a main stent 16 and at least one group of movable stents 17. Optimally, the main stent 16 and the movable stent 17 are both made of a memory alloy skeleton 11 and a coating material 12, and the memory alloy skeleton 11 is sutured to the outside or inside of the coating material 12. Optimally, the memory alloy skeleton 11 is set to a corrugated shape. Optimally, a plurality of inverted V-shaped fixing frames 13 are set on the upper edge of the main stent 16, and barbs 14 are set on the outside of the fixing frame 13.

[0038] The main road support 16 includes a first cylindrical portion 1 and a second cylindrical portion 2. A vertical partition 3 is provided in the first cylindrical portion 1. The vertical partition 3 divides the first cylindrical portion 1 into a first flow diversion chamber 4 and a second flow diversion chamber 5. The cross-sectional area of ​​the first flow diversion chamber 4 is larger than the cross-sectional area of ​​the second flow diversion chamber 5. The second cylindrical portion 2 is integrally formed with the first cylindrical portion 1 and communicates with the first flow diversion chamber 4. Optimally, at least one transverse partition 8 is provided in the second flow diversion chamber 5. The transverse partition 8 divides the second flow diversion chamber 5 into two third flow diversion chambers 9. The connecting portion 6 of the movable support 17 is respectively provided in the third flow diversion chamber 9 and fits tightly with the inner wall of the third flow diversion chamber 9. Optimally, two transverse partitions 8 are provided in the second flow diversion chamber 5. The transverse partition 8 divides the second flow diversion chamber 5 into three fourth flow diversion chambers 10. The connecting portion 6 of the movable support 17 is respectively provided in the fourth flow diversion chamber 10 and fits tightly with the inner wall of the fourth flow diversion chamber 10.

[0039] The movable bracket 17 includes a connecting portion 6 and a guide portion 7, the connecting portion 6 and the guide portion 7 are integrally formed, and the cross section of the guide portion 7 is preferably set to be circular. The connecting portion 6 is arranged in the second guide cavity 5 and is tightly fitted with the inner wall of the second guide cavity 5. Preferably, a hook 15 is arranged on the movable bracket 17, and the hook 15 is arranged on a side close to the vertical partition 3.

[0040] The working principle of the above structure is as follows: when the tumor involves the left subclavian artery, the main stent 16 is placed in the thoracic aorta through the releasing device, so that the main stent 16 is tightly fitted with the inner wall of the thoracic aorta, and the barb 14 penetrates the inner wall of the thoracic aorta, and then a movable stent 17 is inserted from the left brachial artery, and after entering the thoracic aorta, it continues to penetrate into the second diversion cavity 5, so that the connecting part 6 of the movable stent 17 in the second diversion cavity 5 is slowly released, and the connecting part 6 is tightly fitted with the inner wall of the second diversion cavity 5, and then the movable stent 17 is slowly pulled so that the hook 15 on the movable stent 17 is hung on the vertical partition 3. At this time, the blood in the thoracic aorta is shunted. Since the connecting part 6 is tightly fitted with the second diversion cavity 5 after being released, there is no internal leakage of blood, thereby achieving the therapeutic effect of thoracic aortic aneurysm.

[0041] When the tumor involves the left common carotid artery and the left subclavian artery, the main stent 16 is placed in the thoracic aorta through the releasing device, so that the main stent 16 fits tightly against the inner wall of the thoracic aorta, and the barbs 14 penetrate into the inner wall of the thoracic aorta. Then, two movable stents 17 are taken, and the two movable stents 17 are respectively inserted into the left brachial artery and the left common carotid artery, and then pass out from the third diversion cavity 9 of the main stent 16, so that the connecting parts 6 of the two movable stents 17 are slowly released in the third diversion cavity 9, and the two connecting parts 6 fit tightly against the inner wall of the third diversion cavity 9. Then, the movable stent 17 is slowly pulled so that the hook 15 on the movable stent 17 is hung on the vertical partition 3. At this time, the blood in the thoracic aorta is shunted through this structure to achieve the therapeutic effect.

[0042] When the tumor involves the left common carotid artery, the left subclavian artery and the innominate artery, the main stent 16 is placed in the thoracic aorta through the releasing device, so that the main stent 16 fits tightly against the inner wall of the thoracic aorta, and the barbs are inserted into the inner wall of the thoracic aorta. Then three movable stents 17 are taken, and the three movable stents 17 are respectively inserted into the left brachial artery, the left common carotid artery and the right brachial artery, and then pass out from the fourth diversion cavity 10 of the main stent 16, so that the connecting parts 6 of the three movable stents 17 are slowly released in the fourth diversion cavity 10, and the three connecting parts 6 fit tightly against the inner wall of the fourth diversion cavity 10. Then the movable stent 17 is slowly pulled so that the hook 15 on the movable stent 17 is hung on the vertical partition 3. At this time, the blood in the thoracic aorta is shunted through this structure to achieve the therapeutic effect.

Claims

1. A covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm, characterized in that: The invention comprises a main path support (16) and at least one group of movable supports (17), wherein the main path support (16) comprises a first cylindrical portion (1) and a second cylindrical portion (2), wherein a vertical partition (3) is arranged inside the first cylindrical portion (1), wherein the vertical partition (3) divides the first cylindrical portion (1) into a first flow guide cavity (4) and a second flow guide cavity (5), wherein the cross-sectional area of ​​the first flow guide cavity (4) is larger than the cross-sectional area of ​​the second flow guide cavity (5), wherein the second cylindrical portion (2) is integrally formed with the first cylindrical portion (1) and is in communication with the first flow guide cavity (4), and wherein the movable support (17) comprises a connecting portion (6) and a guide portion (7), wherein the connecting portion (6) and the guide portion (7) are integrally formed, and the connecting portion (6) is arranged in the second guide cavity (5) and is tightly fitted with the inner wall of the second guide cavity (5); the cross-sectional shapes of the first guide cavity (4) and the second guide cavity (5) are both semicircular, the vertical partition (3) and the inner wall of the first cylindrical portion (1) are integrally formed, the connecting portion (6) of the movable bracket (17) is arranged to be of a special shape, and the shape of all the connecting portions (6) after being assembled is consistent with the shape of the second guide cavity (5); The upper edge of the main road support (16) is provided with a plurality of inverted V-shaped fixing frames (13), and the outer side of the fixing frames (13) is provided with barbs (14); The movable bracket (17) is provided with a hook (15), and the hook (15) is arranged on a side close to the vertical partition (3) and is used to be hung on the vertical partition (3).

2. The stent graft according to claim 1, characterized in that: At least one transverse partition (8) is arranged in the second flow guide cavity (5), and the transverse partition (8) divides the second flow guide cavity (5) into two third flow guide cavities (9). The connecting parts (6) of the movable bracket (17) are respectively arranged in the third flow guide cavities (9) and are tightly fitted with the inner walls of the third flow guide cavities (9).

3. The stent graft according to claim 2, characterized in that: Two transverse partitions (8) are arranged in the second flow guide cavity (5), and the transverse partitions (8) divide the second flow guide cavity (5) into three fourth flow guide cavities (10). The connecting parts (6) of the movable bracket (17) are respectively arranged in the fourth flow guide cavities (10) and are tightly fitted with the inner walls of the fourth flow guide cavities (10).

4. The stent graft according to claim 1, characterized in that: The cross section of the flow guide portion (7) is arranged to be circular.

5. The stent graft according to claim 1, characterized in that: The main path support (16) and the movable support (17) are both made of a memory alloy skeleton (11) and a coating material (12), and the memory alloy skeleton (11) is sewn onto the outside or inside of the coating material (12).

6. The stent graft according to claim 5, characterized in that: The memory alloy skeleton (11) is configured to be in a corrugated shape.

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