This is an implantable vaso-occlusive device. It is a complex, helically wound coil comprised of a primary helically wound coil which is then wound into a specific secondary shape. The final shape upon deployment is in the approximate shape of an anatomical cavity. upon deployment, the device first fills...http://www.google.fr/patents/US5957948?utm_source=gb-gplus-shareBrevet US5957948 - Three dimensional in-filling vaso-occlusive coils
