A novel split-type intracranial stent graft system and its application method

Abstract

The invention discloses a novel split intracranial covered stent system which comprises a self-expanding stent system, a delivery catheter and a membrane barrel structure system which is of an independent structure and is provided with a long electrolytically detachable push rod. The membrane barrel structure system comprises supporting rings arranged at two ends and multiple alloy metal wires arranged between the two supporting rings and visible under X light, wherein a frame structure composed of the two supporting rings and the multiple alloy metal wires is externally or internally wrappedor lined with a membrane wholly. Clinical safe implementation of an ideal treatment mode self-expanding local covered stent is guaranteed. Instant and lasting effective plugging of part of intracranial aneurysm can be achieved, and lots of shortcomings of secondary spring ring embolism of dense net stents and traditional bare stents are avoided. Due to the fact that a supporting membrane barrel structure of the self-expanding stent system is adopted, the adaptability and adherence advantages of the system are more obvious compared with existing balloon-expanded laser engraving type full covered stents, the severe disadvantages of the later are overcome, and the novel split intracranial covered stent system is conductive to improvement of clinic safety and disease cure rate.

Description

technical field [0001] The invention relates to a novel split-type intracranial stent graft system and its application method. Background technique [0002] For large intracranial aneurysms, especially intracranial rupture and unruptured aneurysms with a jet sign in the neck of the aneurysm, especially the narrow neck of the large sac in the supraclinoid segment of the internal carotid artery, the current conventional treatment, including dense mesh stents, has a high recurrence rate. The only Willis covered stent is a ball-expandable laser-engraved stent external suture membrane. The stent is often difficult to conform to the tortuous intracranial blood vessels, and eventually due to poor antegrade and poor apposition, proximal internal fistula will increase the risk of operation and even lead to severe complication. [0003] The principle of covered stent treatment for intracranial aneurysms is to insert a bio-physical barrier stent into the parent artery, and to isolate ...

AI Technical Summary

Problems solved by technology

This kind of stent has the following problems: ①Failure of the covered stent to be in place: the stent cannot guarantee smooth access to the lesion, especially for patients with tortuous arteries; The tortuous blood vessel is straightened, causing the tearing of the vessel wall or the tearing and damage of the branch arteries at the part, resulting in fatal bleeding; ③Poor apposition of the covered stent: causing proximal internal fistula and increasing the risk of surgery

This kind of stent has the following problems: ① difficult stent delivery, stent displacement after release, unpredictable stent shortening, etc.; ② delayed rupture of aneurysm: the exact cause of delayed rupture is not completely clear, and it should not be related to the neck of the aneurysm. It is related to achieving immediate and effective occlusion; ③ thrombosis of parent artery or occlusion of perforating branch: side branch or perforating branch occlusion is prone to occur when multiple stents are placed, which may lead to serious complications; ④ postoperative aneurysm rupture or aneurysm recurrence Risks: After stent implantation, the aneurysm sac gradually becomes thrombosed, and the intrasac pressure may increase for a certain period of time after surgery, so there is a risk of aggravated symptoms or rupture of the aneurysm. Even if the angiography shows that the entire aneurysm is no longer visible, The neck of the aneurysm may not be endometrialized, and there is still a possibility of recurrence

Images