Structure for covered stent and covered stent

Abstract

The invention discloses a structure for a covered stent and the covered stent. The structure comprises an outer-layer film, a metal stent body and an inner-layer film which are sequentially distributed from outside to inside. A cavity is formed between the outer-layer film and the inner-layer film and is used for allowing the metal stent body to be placed; the thickness of the cavity is larger than that of the metal stent body, and the metal stent body can move in the cavity. The structure adopting the technical scheme provided by the invention has the following beneficial effects that 1, customization does not need to be carried out according to the blood vessel type and size of a patient, and mass production can be easily realized; 2, the opening position of the covered stent can completely cooperate with the branch of the patient, so that the blood flow of the branch is not influenced; 3, the surgical operation is easy, the operation time is short, and surgical complications are notliable to generate; 4, inner leakage at the joint of the branch and the body is reduced; and 5, displacement of the branch stent is prevented.

Description

technical field [0001] The present application relates to the technical field of medical devices, in particular to a structure for a stent-graft and a stent-graft. Background technique [0002] Thoracic aortic aneurysm refers to an aneurysm that occurs in the aortic sinus, ascending aorta, aortic arch, or descending aorta. It is an abnormal expansion, deformation, and tumor-like protrusion of the thoracic aorta. The "tumor-like" mass formed by local or multiple irreversible expansion or bulging of the thoracic aorta caused by various reasons is called an aneurysm. Aneurysms are divided into three types: true aneurysm, false aneurysm, and aortic dissection. The covered stent can be mainly used to seal the breach and play a role in the treatment of aortic aneurysm. When the breach is at the distal end of the left clavicle, a conventional straight-tube stent-graft can be used for occlusion; when the breach is at the active arch or ascending aorta, due to the lack of anchoring...

AI Technical Summary

Problems solved by technology

The main disadvantages are: due to the large individual differences in the blood vessels of patients, the angles and sizes of the blood vessels are numerous, it is not suitable for mass production. At the same time, because the stent has branches, the required delivery sheath is also large, so it is not suitable for most cases.

The main defect is that this type of covered stent is similar to the branched covered stent, and the individual differences of different patients are large, and the angle of the blood vessel changes a lot, so it is not suitable for mass production. The position of the hole is not easy to align with the branch blood vessels, which will have a certain impact on the blood flow of the branches

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