An occlusion device (10) for the closure of a physical anomaly such as a vascular aperture or an aperture in a septum, includes a center strut (12) with a pair of collapsible support frames (16, 18). Polyvinyl alcohol foam sheets (42, 44) are attached to each of the support frames (16, 18)....http://www.google.se/patents/US6174322?utm_source=gb-gplus-sharePatent US6174322 - Occlusion device for the closure of a physical anomaly such as a vascular aperture or an aperture in a septum
