Integrated covered branch vessel stent and its delivery system

Abstract

The invention relates to an integrated coated branched vascular stent and a conveying system thereof. A main body and branches of the stent are of an integrated design, and the main body and branches of the stent each is coated with an integrated coating material, so that the incidence rate of internal leakage caused after the stent is implanted can be reduced; the front end of the main body of the stent is a bare stent portion, so that anchoring can be strengthened; the stent edge of the stent main body of the stent and connections between the main body stent and branch stents are provided with platinum-iridium alloy developing points, so that the position of the stent can be dynamically monitored during the release of the stent, and the aim of accurately locating and releasing the stent is achieved. The stent is fixed and released by adopting a binding design, so that the stent can be in a compressive state and firmly fixed to the maximum, the diameter of a conveyor is reduced, and distant-range conveying and operating are facilitated; the conveying system adopts a staged release manner, so that the problem that the existing stents are prone to displacement during release and cannot be readjusted is solved, and the conveying system has a very good market application prospect.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an integrated film-covered branch vessel stent and a delivery system thereof. Background technique [0002] Aortic aneurysm is a global common disease that is extremely harmful to human health and has a high mortality rate. Traditional surgery involves large injuries, many complications, and high mortality. Moreover, there are still a large number of patients who are difficult to perform surgical treatment because of the dysfunction of other important organs. Endoluminal aorticaneurysm repair (EAAR) was first proposed in 1991. In recent years, with the rapid development of interventional radiology technology and equipment, endovascular aneurysm repair (EVAR) has gradually matured. Compared with traditional surgery, it has the advantages of no thoracotomy, no laparotomy, less trauma, fewer surgical complications, shorter hospital stay, and wide indications. It has become the firs...

AI Technical Summary

Problems solved by technology

However, the chimney technique will inevitably lead to postoperative endoleak problems, resulting in poor long-term efficacy, and devascularized branch aortic arch upper branch vascular bypass grafting increases the difficulty and degree of trauma of the operation, which may increase the risk of cerebrovascular accidents. incidence of

The second reason is that due to the curvature of the aortic arch, after the implantation of the covered vascular stent, if the anchoring area is too short, or the curvature of the aortic arch is too large, it is easy to form continuous endoleaks on the greater and lesser curvatures

The third reason is the expansion of the anchoring area of ​​the aneurysm neck with similar pathophysiological features to the early aneurysm, the lack of histological healing between the stent-graft and the vessel wall of the aneurysm neck, and the straight cylindrical stent-graft in the curved aortic arch. Displacement and detachment of stent due to malformation

The incidence rate of the latter two complications can reach 30%, which will lead to the failure of this high-tech and high-priced (150,000-200,000 yuan / case) TEVAR clinical treatment, limiting the clinical application and development of TEVAR

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