A kind of aortic covered branch stent

Abstract

The invention relates to an aorta tectorial membrane branch stent, which comprises a main stent and a branch stent, wherein the main stent is placed in an aorta; the branch stent is arranged at the outer side of the side wall of the main stent and is communicated with the main stent; the main stent comprises a tectorial membrane and a plurality of circles of wave-shaped annular objects supporting the tectorial membrane; the wave pitch of the annular objects and the distance between the adjacent wave crest and wave trough are gradually increased from the bow-shaped inner side to the outer side, so that the shape of the main stent is in a bow shape after natural expansion; the branch stent comprises a branch stent tectorial membrane and a telescopic spring structure supporting the branch stent tectorial membrane; the bottom end of the branch stent is connected with the outer side of the side wall of the main stent; through the wave-shaped annular objects, the main stent can be tightened up to a state that the caliber is reduced and maintains a tightened state by a plurality of tightening devices; through the spring structure, the branch stent can be compressed and maintain the compressed state by a compressing device. The aorta tectorial membrane branch stent has the advantages that the structure is simple; the operation is convenient and fast; the aorta cannot be injured.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an aortic covered branch stent. Background technique [0002] Cardiovascular disease is currently the number one killer threatening the health of Chinese people. Aortic aneurysm is one of the most dangerous acute and severe cardiovascular diseases. It is clinically called a "time bomb". At present, the treatment of aortic lesions includes drug therapy, surgical treatment, interventional therapy and other methods. Drug treatment is mainly to reduce the incidence of aneurysm expansion or rupture through strict control of blood pressure. Surgical treatment is mainly aneurysm resection and artificial or homovascular grafting. At present, the surgical mortality rate of abdominal aortic aneurysm is less than 5%. Can exceed 25%. The surgical mortality rate of thoracic aortic aneurysm is 30%, and the surgical risk of aortic arch aneurysm is the greatest. However, the operation is perfo...

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Problems solved by technology

However, the operation is performed under deep hypothermic extracorporeal circulation, and there is a risk of ischemic necrosis of the spinal cord, brain, and important organs. Many elderly patients lose treatment opportunities due to their high-risk factors and cannot tolerate surgical treatment under thoracotomy.

[0003] With the development, progress and wide application of interventional materials, covered stents are more and more widely used. Traditional covered stents are mainly composed of metal wires and covering films on them. This kind of stent can be deformed. It is straight, but once the stent is implanted in the aorta, it can be bent so that it can adapt to the arched aorta. Once the stent is bent, it will inevitably produce a force to restore it to its original shape. This force will Puts pressure on the aorta, sometimes causing damage to the aorta

In addition, there are many covered stents with sub-stents on the market. The sub-stents of this covered stent are connected to the side wall of the main stent and communicate with the main stent. Because there are sub-stents, this kind of sub-stent When the covered stent graft is implanted in the aorta, it is more inconvenient to operate. Once the compressed covered stent graft is released, if the sub-stent is not aligned with the corresponding blood vessel, the blood vessel will be blocked, and the patient may die. Happening

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