A method of forming a PVA foam structure for use in an occlusion device such that the PVA foam structure comprises non-thrombogenic properties. The method comprises forming a PVA gel and incorporating heparin into the PVA gel. The PVA foam structure is then treated with the PVA gel and heparin mixture,...http://www.google.ca/patents/US6656206?utm_source=gb-gplus-sharePatent US6656206 - Occlusion device with non-thrombogenic properties
