Stent graft

Abstract

The invention relates to the technical field of medical instruments, in particular to a stent graft used for treating peripheral arterial diseases and provided with a branch stent. The stent graft comprises a main stent and the branch stent, the main stent and the branch stent are each provided with a near end, a far end and an inner cavity arranged between the near end and the far end, an opening is formed in the main stent, the main stent and the branch stent are connected through a connector, the connector is provided with a bottom connected with the opening, a top capable of movably entering and exiting the opening and a connection inner cavity arranged between the bottom and the top, and the near end of the branch stent is connected with the top of the connector. The stent graft has the advantages that the stent graft is used for treating vascular diseases, is wide in adaptability, does not need to be customized, can be used for recovering multiple branch arteries when the peripheral arterial diseases are treated, prevents vascular stents from being implanted twice or many times and simplifies operation difficulty.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a stent graft with branch stents for treating arterial diseases. Background technique [0002] Endovascular aortic repair surgery is developing rapidly, and its application fields are becoming wider and wider. The stents generally used for minimally invasive treatment are divided into fenestration stents, branch stents, mosaic stents and dendritic stents. [0003] After the fenestrated stent is released, as the artery pulsates, the fenestration may not coincide with the ostium of the branch artery, resulting in intermittent ischemia of the branch artery, and then thrombosis of the artery, and when the blood flows through the ostium, There may be some blood flow to the original lesion, so that the blood flow continues to impact the lesion area of ​​the artery, the lesion continues to develop, and the operation fails. The integrated branch stent must be custom-designed, an...

AI Technical Summary

Problems solved by technology

[0003] After the fenestrated stent is released, as the artery pulsates, the fenestration may not coincide with the ostium of the branch artery, resulting in intermittent ischemia of the branch artery, and then thrombosis of the artery, and when the blood flows through the ostium, There may be some blood flow to the original lesion, so that the blood flow continues to impact the lesion area of ​​the artery, the lesion continues to develop, and the operation fails

The integrated branch stent must be custom-designed, and it takes a long time to customize, and most of these patients are very urgent, and the patient cannot get the stent they need in a short time, and the operation is cumbersome during the operation. Design technical limitations, no clinical implementation of multibranch stents

The defects of mosaic stents are as follows: it also does not have wide applicability, and the extraluminal part protrudes from the straight tubular stent graft, which may block the outlet when encountering the blood cavity of normal blood vessels, resulting in the failure of the corresponding artery to supply blood or the corresponding organs , Ischemia or even necrosis of the organ, the operation in the later stage is complicated, and it cannot be guaranteed to be implemented smoothly according to the preoperative plan (for example, the branch stent cannot be implanted according to the preoperative plan, thus causing the branch artery to be occluded and unable to supply blood)

However, this design is essentially a type of mosaic stent, and its design defects are: 1. The sub-stent graft forms a certain angle with the lumen of the cylindrical stent, and the impact of blood flow from the proximal end may cause the cylindrical stent to contact with the tubular stent. The long-term displacement of the covered sub-stent; 2. The blood flow in the branch vessel flows downstream from the direction of the blood flow flowing out of the arterial vessel, because one end of the tubular branch cavity is placed in the cylindrical stent, and the other end is in contact with the surface of the cylindrical stent Therefore, when the sub-stent-graft is placed in the later stage, the sub-stent-graft of the puncture approach must be transported in the countercurrent direction, and the port of the sub-stent-graft must be set opposite to the distribution of the outlet of the depression, which will increase the operation time. difficulty and risk

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