Development of Covered Stents for Treatment of Cerebral Aneurysms

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We Developed microporous covered stents, which were stents with thin layer membrane with a lot of micropores for treatment of cerebral aneurysms. In general, it small pore is effective for occlusion of aneurysms. On contrary, it is considered that large pore is effective for maintenance of branching flow, but unfavorable to occlusion of aneurysms. However, in this study, micropores with size in a certain range stopped almost completely the blood flow in the aneurysms. This was observed in in vitro experiments using circulation circuit. A large micropore could stop the blood flow in the aneurysms, which was confirmed in animal experiments.