A kind of intravascular false lumen occlusion stent

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a blood vessel inner false lumen blocking stent, comprising a stent body, a distal choke membrane, a proximal choke membrane, two circumferential blocking membranes, a release nut and a fixed bushing. The stent body is an expandable net body knitted by nickel-titanium alloy wire, and 2 to 4 layers of distal choke membrane are parallel mutually and are mounted inside the distal end of the stent body at intervals, thus, the multiple layers of distal choke membrane are used for preventing backflow ofdistal break blood; 2 to 4 layers of proximal choke membranes are parallel mutually and are mounted inside the proximal end of the stent body at intervals; the outer surfaces of two ends of the stentbody are covered with two circumferential blocking membranes circumferentially. The stent has excellent deformability and flexibility, good anchoring effect, cannot fall to aorta true lumen, can effectively prevent aorta distal break blood from flowing back to the false lumen, and is favorable for thrombus formation of the false lumen and remodeling of the true lumen.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a stent for occluding a false lumen in a blood vessel. [0002] technical background [0003] In the present invention, the term "proximal end" refers to the end close to the heart along the blood flow direction, and "distal end" refers to the end away from the heart along the blood flow direction. [0004] Aortic disease is a group of cardiovascular diseases that seriously threaten human health, and aortic dissection is a catastrophic disease. Aortic dissection refers to the tearing of the blood in the aortic cavity from the aortic intima into the aortic media, which separates the media and expands along the long axis of the aorta to form a true and false two-chamber separation of the aortic wall. At present, the use of endovascular exclusion and the use of covered stents in the treatment of aortic dissection is a major progress in the treatment of aortic dis...

AI Technical Summary

Problems solved by technology

However, the distal end of aortic dissection in the chronic phase generally has multiple breaches, and many distal breaches are far from the primary breach at the proximal end, and are closer to important branch arteries. The breach size is greater than 5mm, resulting in true lumen The stent graft in the inner can't effectively seal the distal tear

The distal breach will become the inflow channel of the false lumen, making the false lumen unable to effectively thrombus, and even make the false lumen continue to expand until the aorta ruptures

[0005] At present, clinically, doctors use longer covered stents to seal the distal breach. This technique is likely to cause spinal ischemia, and there are also distal breaches that are closer to important branch arteries that cannot be closed.

At the same time, the clinical use of congenital heart disease occluder to occlude the distal breach has the risk of falling off of the occluder, and the distal breach close to important branch arteries cannot be closed.

In addition, foreign clinicians use modified vascular stents to implant false lumens, and then implant occluders to block the blood flow back from the distal breach, which makes the false lumen faster thrombosis, but this technology exists The poor flexibility of the stent may easily lead to the risk of new vascular rupture, and also affect the effect of postoperative false lumen shrinkage and true lumen remodeling

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