Double-layer elephant trunk stent artificial blood vessel

Abstract

A first pipe section and a second pipe section are arranged, the second pipe section comprises an inner layer, an outer layer and a releasable elastic support located between the inner layer and the outer layer, and the upper end of the outer layer is separated from the inner layer to form a skirt edge, so that the far end of the second pipe section can be connected with a descending aorta firstly; according to the initial form of the far end of the second pipe section, the inner layer, the outer layer and the releasable elastic support between the inner layer and the outer layer are in a contracted state, after the far end of the second pipe section is placed in the descending aorta, the elastic support is released to open the descending aorta, the outer layer and the descending aorta are tightly attached under the supporting and pressing effects of the elastic support, and therefore the descending aorta is expanded. Therefore, suturing is not needed temporarily, blood perfusion circulation can be carried out only by clamping the upper end of the inner layer, and then the skirt edge is turned outwards and then is sutured and fixed with the descending aorta. Therefore, the double-layer elephant trunk stent artificial blood vessel which can be quickly matched with a descending aorta incision and is beneficial to shortening the circulation stopping time is provided.

Description

Technical Field

[0001] This utility model relates to the field of artificial blood vessels, and in particular to a double-layer elephant trunk stent artificial blood vessel. Background Technology

[0002] Aortic dissection is one of the most critical and acute conditions in cardiac surgery, with a high incidence rate. However, the surgery is complex and prone to postoperative complications. The classic surgical method is: ascending aortic replacement + total aortic arch replacement + elephant trunk stent implantation. The specific procedure involves first addressing the aortic root and performing ascending aortic replacement. Then, the four-branched artificial blood vessel is sutured to the aortic root, and the aortic arch is replaced. Next, the elephant trunk stent is placed into the descending aorta distal to the left subclavian artery through an incision in the descending aorta. Because the releasable metal stent of the elephant trunk stent is in contact with the descending aorta, the stent body must be sutured to the descending aorta. Before suturing is completed, blood perfusion to the lower body must be stopped to prevent blood spurting. The proximal end is anastomosed to the distal end of the four-branched artificial blood vessel. Finally, three branches of the four-branched artificial blood vessel are anastomosed to three branches on the autologous aortic arch (brachial artery, left common carotid artery, and left subclavian artery). This procedure is highly complex, and the large number of anastomoses carries a risk of postoperative bleeding. When placing the distal elephant trunk stent and anastomosing (suturing) it to the descending aortic incision, blood perfusion to the lower body often needs to be stopped to avoid blood spurting out. This time is called circulatory arrest time, which is about 10-60 minutes. Circulatory arrest time is directly related to the patient's postoperative recovery and complications. Utility Model Content

[0003] (1) Technical problem to be solved: In view of the shortcomings of the prior art, when placing the distal elephant trunk stent and anastomosing it to the descending aorta incision, it is often necessary to stop blood perfusion in the lower body in order to avoid blood spurting out, resulting in a long circulatory arrest time. This utility model provides a double-layer elephant trunk stent artificial blood vessel that can achieve rapid anastomosis with the descending aorta incision and is conducive to shortening the circulatory arrest time.

[0004] (2) The technical solution adopted by this utility model is as follows:

[0005] A double-layered elephant trunk stent artificial blood vessel includes a first segment and a second segment. The second segment includes an inner layer, an outer layer, and a releasable elastic stent located between the inner and outer layers. The inner and outer layers are sealed together. The upper end of the outer layer is separated from the inner layer to form a skirt. The elastic stent is located at the part where the inner and outer layers meet. The inner layer is used to connect to the first segment.

[0006] A further technical solution is that the upper end of the inner layer is provided with an extension, the length of which is greater than the length of the skirt.

[0007] A further technical solution is that several branch pipes are installed on the first pipe section.

[0008] A further technical solution is that the inner and outer layers of both the first and second pipe sections are made of polyester material.

[0009] A further technical solution involves using a releasable elastic scaffold made of biodegradable and absorbable metal.

[0010] A further technical solution involves applying a bio-coating to the inner surface of the inner layer.

[0011] A further technical solution involves providing annular raised fold structures on the outer surface of the outer layer.

[0012] (3) Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: by setting a first tube segment and a second tube segment, and the second tube segment includes an inner layer, an outer layer and a releasable elastic stent located between the inner layer and the outer layer, the upper end of the outer layer is separated from the inner layer to form a skirt, the releasable elastic stent is located at the part where the inner layer and the outer layer are close together, and the inner layer is used to connect with the first tube segment. In use, the distal end of the second tube segment can be inserted or placed into the descending aorta first. Since the second tube segment includes an inner layer, an outer layer and a releasable elastic stent located between the inner layer and the outer layer, the releasable elastic stent is different from the existing The stent structure is identical. Initially, the distal end of the second segment has a contracted state, with the inner and outer layers, as well as the releasable elastic stent between them, all in a contracted state. After the distal end of the second segment is inserted into the descending aorta, the elastic stent is released to open the aorta. The outer layer and the descending aorta fit tightly together under the support and compression of the elastic stent. The annular fold structure of the outer layer increases its fit to the descending aorta, preventing blood from flowing out through the gaps. Therefore, sutures are not required temporarily; only the upper end of the inner layer needs to be clamped to allow blood perfusion and circulation. Subsequently, the skirt is everted and sutured to the descending aorta for fixation. This provides a double-layered elephant trunk stent artificial blood vessel that can quickly anastomose with the descending aortic incision and helps shorten the time of circulatory arrest. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0014] Figure 2 yes Figure 1 A magnified schematic diagram of a local structure;

[0015] Figure 3 This is a schematic diagram of the structure connecting the inner layer and the elastic support described in this utility model;

[0016] Figure 4 This is a schematic diagram of the fold structure described in this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-4 As shown.

[0019] A double-layer elephant trunk stent artificial blood vessel includes a first segment 1 and a second segment 2. The second segment 2 includes an inner layer 3, an outer layer 4, and a releasable elastic stent 5 located between the inner layer 3 and the outer layer 4. The inner layer 3 and the outer layer 4 are sealed together. The upper end of the outer layer 4 is separated from the inner layer 3 to form a skirt 6. The elastic stent 5 is located at the part where the inner layer 3 and the outer layer 4 meet. The inner layer 3 is used to connect to the first segment 1.

[0020] In use, the first tube segment 1 and the inner layer 3 can be pre-stitched together or sutured together during the operation. The connection between the inner layer 3 and the elastic stent 5 can adopt the existing connection method of elephant trunk stent artificial blood vessel, such as heat fusion connection or suture connection. The main innovation of this utility model is the setting of the outer layer 4 and the skirt 6. The skirt 6 can also be called a trumpet-shaped structure. The connection between the lower end of the outer layer 4 and the inner layer 3 can be an integral structure, which is equivalent to the lower end of the inner layer 3 being turned outward and lifted upward by a certain distance. The inner layer 3 and the outer layer 4 are equivalent to a pocket, or the outer layer 4 and the inner layer 3 are separate. The lower ends of the outer layer 4 and the inner layer 3 are connected by heat fusion, which can also form a pocket between the inner layer 3 and the outer layer 4. The outer layer 4 and the upper part of the inner layer 3 are fixed by local heat fusion or suturing, as long as it does not affect the release of the elastic stent 5. The initial shape of the distal end of the second segment 2 is that the inner layer 3, the outer layer 4, and the releaseable elastic stent 5 between the inner layer 3 and the outer layer 4 are in a contracted state, similar to the initial state of the existing elephant trunk stent vessel. By binding, the elastic stent 5, the inner layer 3, and the outer layer 4 are contracted. After it is placed in the descending aortic incision, the elastic stent 5 is released to expand the whole structure. The surface of the outer layer 4 then adheres to the inner wall of the descending aorta. Under the action of the elastic stent 5, they can adhere tightly. Then, the inner layer 3 is clamped with a vascular clamp to start blood circulation in the lower body. This can significantly shorten the time of circulatory arrest, reduce the difficulty of anastomosis, and reduce a series of complications. Afterwards, the skirt 6 is everted and sutured to the descending aorta for fixation.

[0021] The upper end of the inner layer 3 is provided with an extension 7. The length of the extension 7 is greater than the length of the skirt 6, which facilitates the stitching connection between the inner layer 3 and the first pipe segment 1, and can also clearly separate the skirt 6 from the inner layer 3, which is beneficial for operation. The extension 7 is also the clamping position.

[0022] The first pipe section 1 is provided with several branch pipes 8, which are respectively a thicker injection pipe and a thinner exhaust pipe.

[0023] The outer layer 4 of both the first tube segment 1 and the second tube segment 2 is made of polyester material, which is the preferred material. Other materials used for artificial blood vessels can also be selected. The inner layer is made of existing polyester or existing stent covering material. In other words, the inner layer and the elastic stent can be made of existing covered stent artificial blood vessels.

[0024] The releasable elastic stent 5 is made of biodegradable absorbable metal material. The releasable elastic stent 5 has the same material and structure as the stent in the existing elephant trunk stent blood vessel, such as biodegradable magnesium alloy material or polymer material such as polylactic acid. It can gradually degrade over time, and its degradation products are non-toxic and harmless to the human body.

[0025] The inner surface of the inner layer 3 is coated with a bio-coating to improve the biocompatibility of the artificial blood vessel wall, promote endothelial cell growth, reduce thrombus formation, and reduce infection.

[0026] The outer surface of the outer layer 4 is provided with annular raised fold structures 9 to maximize its contact area with the descending aortic vessel wall, prevent blood leakage, and even achieve a suture-free effect.

[0027] This invention not only shortens the time of deep hypothermic circulatory arrest but also increases the temperature required during surgery. Because aortic dissection surgery requires circulatory arrest, some organs in the body suffer from a lack of blood perfusion, resulting in significant damage. Therefore, hypothermia has always been the preferred method of protection. Currently, the patient's body temperature is lowered to around 26 degrees Celsius during surgery. Previously, due to less advanced technology and slower procedures, the temperature had to be lowered to 15 degrees Celsius. This effectively prolongs the time of tissue ischemia, allowing the tissues to recover their function after the surgery, similar to the refrigeration and preservation of meat products. However, low temperatures also cause significant damage to various aspects of the human body, especially to coagulation function and complications in the nervous system. Therefore, hypothermic operation is a trade-off between advantages and disadvantages. Since this invention can shorten the operation time and quickly restore blood perfusion, the required temperature can be lowered, reducing ischemic damage while also mitigating hypothermic damage.

[0028] The above are merely preferred embodiments of this utility model.

Claims

1. A double-layered elephant trunk stent artificial blood vessel, characterized in that, The device includes a first pipe segment (1) and a second pipe segment (2). The second pipe segment (2) includes an inner layer (3), an outer layer (4), and a releasable elastic support (5) located between the inner layer (3) and the outer layer (4). The inner layer (3) and the outer layer (4) are sealed together. The upper end of the outer layer (4) is separated from the inner layer (3) to form a skirt (6). The elastic support (5) is located at the part where the inner layer (3) and the outer layer (4) are close together. The inner layer (3) is used to connect with the first pipe segment (1).

2. The double-layer elephant trunk stent artificial blood vessel according to claim 1, characterized in that, The upper end of the inner layer (3) is provided with an extension (7), the length of which is greater than the length of the skirt (6).

3. The double-layer elephant trunk stent artificial blood vessel according to claim 1, characterized in that, Several branch pipes (8) are installed on the first pipe section (1).

4. The double-layer elephant trunk stent artificial blood vessel according to claim 1, characterized in that, The outer layer (4) of both the first pipe section (1) and the second pipe section (2) is made of polyester.

5. The double-layer elephant trunk stent artificial blood vessel according to claim 1, characterized in that, The releasable elastic scaffold (5) is made of biodegradable and absorbable metal.

6. The double-layer elephant trunk stent artificial blood vessel according to claim 1, characterized in that, The inner surface of the inner layer (3) is coated with a bio-coating.

7. The double-layer elephant trunk stent artificial blood vessel according to claim 1, characterized in that, The outer layer (4) has an annular raised fold structure (9) on its outer surface.

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