Individualized combined covered stent in aortic arch

Abstract

The invention discloses an individualized combined covered stent in an aortic arch. The individualized combined covered stent comprises a main stent arranged in an aorta and three small stents arranged in a left subclavian artery, a left common carotid artery and a head and arm arterial artery respectively; when the main stent is not restrained in the aorta and is in an expanded state, three openholes corresponding to the three small stents respectively are formed in the portion, where small dispersion holes are formed, of a membrane covering section of the main stent, and when the small stents are not restrained and are in an expanded state, each small stent comprises an approximately tubular membrane covering section and a limiting section which is in butt joint with one end of the membrane covering section and is attached to the inner arc surface of the main stent. According to the covered stent, firstly, the small dispersion holes are prefabricated in the main stent, the main stent is placed in the aorta and is in an expanded state, and the small dispersion holes are opposite to the three branch blood vessels, so that the blood is supplied to the branch blood vessels uninterruptedly, and the technical requirements are reduced.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an individualized combined covered stent in the aortic arch. Background technique [0002] Aortic dissection (aortic dissection, AD) is a rare and serious cardiovascular emergency, characterized by sudden onset, rapid disease progression, and high mortality in the acute phase. The mortality rate of untreated Standford type A aortic arch dissection is as high as 80%. Due to the variable anatomical shape of the aorta, numerous branch vessels, and the complex factors of the disease itself, there are many difficulties in the treatment. [0003] At present, the three-branch aortic arch stent-graft is a new technology for the treatment of Stanford type A aortic arch dissection. The intraoperative stent-graft is a kind of artificial blood vessel covered with nickel-titanium memory metal stent covered with polyester, which is used for surgical treatment of aortic arch...

AI Technical Summary

Problems solved by technology

[0003] At present, the three-branch aortic arch stent-graft is a new technology for the treatment of Stanford type A aortic arch dissection. The intraoperative stent-graft is a kind of artificial blood vessel covered with nickel-titanium memory metal stent covered with polyester, which is used for surgical treatment of aortic arch dissection; specifically The three-branch aortic arch stent-graft consists of the aortic arch and distal descending aortic stent-graft and three brachiocephalic vascular stent-grafts, which are pre-sewn into one and compressed bundled artificial blood vessels, and cut longitudinally along the ascending aorta to At 1.5 cm from the opening of the innominate artery, the openings of the branches of the aortic arch were exposed, and the branches of the designed and bundled stent grafts were placed in the descending aorta, left subclavian artery (LSA), left common carotid artery (LCCA), and brachiocephalic trunk in sequence. Arterial (BT) vessel lumen, release the stent trunk and three branches in sequence, and check whether the main stent vessel and the three branch stent vessels are twisted or folded. This technique simplifies the treatment of aortic arch dissection to a certain extent, but because each The anatomical relationship and size of the aortic arch and BT, LCCA, and LSA three-branch vessels of the patient are different, and the position of the three-branch stent is fixed, which cannot be applied to every case, so that the stent cannot completely match the three-branch vessels of BT, LCCA, and LSA , prone to residual leakage, non-closed false lumen, stent displacement and shedding, leading to new dissections and even increasing the difficulty of surgery

[0004] At present, in order to avoid the above situation, there is a 1:1 copy of the patient's diseased aortic arch using 3D printing technology based on the patient's CT image data, and the opening is completed in vitro to prepare a three-branched aortic arch stent graft for the individual, so as to achieve a combined stent Matching with the aortic arch and three branch vessels, however, this technique needs to be performed under the conditions of extracorporeal circulation and deep hypothermic circulation, which may cause relatively large trauma to the patient

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