Patent ID: 8075585

Claim:
A device for the occlusion of a defect in the vasculature, the defect having a neck portion, said device comprising: a first sheet formed from a first shape memory material and having an unexpanded and an expanded configuration, said unexpanded configuration being in the form of a rolled, elongate cylindrical shape having a longitudinal axis; and a second sheet formed from a second shape memory material which is the same as or different from said first material and having an unexpanded configuration in which said second sheet is conformed onto the surface of said rolled cylindrical shape of said unexpanded first sheet, and an expanded configuration formed when the shape memory material exceeds its transition temperature such that said second sheet expands transversely outward from the longitudinal axis of said first sheet to form one of an umbrella-like shape or a semi-spherical shape, said first sheet and said second sheet are connected by a separable connector, said second sheet is inside the defect and said first sheet is outside the defect, each of said first sheet and said second sheet shaped to function as an occlusion member which blocks the flow of fluid to said defect, the second sheet in the expanded configuration has a first surface which is adjacent to and conformable to the neck of the defect in a fluid flow obstructing manner relative to said defect and has a second surface that is the reverse of said first surface, said second surface is exposed to the inner surface of said defect and said first sheet additionally functions as a securement member to anchor said second sheet of said device proximal said neck of said defect; wherein said second sheet is deployed in an expanded configuration inside said vascular defect, and said first sheet is deployed outside of said vascular defect in the form of a semicircular cylinder which is convex to said neck portion of said vascular defect.