Stent graft suitable for thoracic and abdominal aorta

Abstract

The invention discloses a stent graft suitable for thoracic and abdominal aorta. The stent graft comprises a main channel and two branch channels, wherein proximal ends of the two branch channels communicate with a distal end of the main channel in a butt joint mode. The branch channels have two modes: in the first mode, the branch channel is provided with a reserved sub-channel, that is, at leastone reserved sub-channel extends from the side part or the end part of at least one of the two branch channels, and the reserved sub-channel is a release channel reserved and used for being externally with a branch artery in an anchoring area or the branch artery involved in aortic lesion; and in the second mode, the two branch channels can be provided with no reserved sub-channels, the reservedsub-channels are arranged on extension stents which are subsequently overlapped and connected with the branch channels, the two branch channels are connected with the two extension stents correspondingly, and 0-2 reserved sub-channels can be carried on each extension stent to be used for reconstructing visceral branch arteries. By optimizing a traditional stent structure, later external connectionof the branch artery stent is facilitated, and operation steps are simplified.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a stent graft suitable for thoracoabdominal aorta. Background technique [0002] Thoracoabdominal aortic dilated disease is a disease with dangerous onset, rapid progression and high mortality. [0003] At present, the treatment of thoracoabdominal aortic dilatation is mainly divided into open surgery, hybrid surgery and endovascular treatment. [0004] For open surgery and hybrid surgery, due to large trauma, long operation time, high mortality and complications, it is not suitable for elderly and infirm patients. [0005] For endovascular treatment, fenestrated stents or octopus stents are mainly used for treatment. [0006] The fenestration stent is a side hole corresponding to the branch artery in the area to be covered on the main body of the stent. During the operation, the ball-expandable or self-expanding stent-graft is introduced to the target artery through th...

AI Technical Summary

Problems solved by technology

However, such stents with reserved side holes are custom-made stents according to the patient's own conditions, especially the stent customization time is relatively long. For patients who have ruptured precursors or ruptured and compressed symptoms, the time delay of this technology limits the application.

Moreover, for branch arteries that directly open into the aortic aneurysm cavity, there is a certain risk of endoleak when using fenestrated stents to reconstruct branch arteries

[0007] The octopus stent technique is expensive for surgery, and it is prone to stenosis and occlusion of the chimney stent (stenosis and occlusion of the chimney stent: refers to the compression of the chimney stent by the aortic stent graft after intraluminal isolation of the chimney, causing its stenosis and occlusion to cause branch artery ischemia, Renal failure, intestinal ischemia and other complications); when there are many chimneys, the caliber of the main stent is too large to cause the risk of tube wall rupture; postoperative endoleaks are likely to occur, and the tumor cavity continues to expand

[0008] Therefore, there is currently no stent specifically suitable for dilatation of the thoracoabdominal aorta. If the branch arteries need to be reconstructed in the later stage, the existing stent structure is not convenient for the stent to introduce the corresponding branch arterial blood, and the operation is difficult.

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