Apparatus and method are disclosed by which a hollow distal end portion of a wire may be deposited at selected sites in body passageways. The apparatus includes an elongate wire (solid or hollow) having a distal end section for detachment and delivery to a target location, the wire also having a discontinuity...http://www.google.co.uk/patents/US6346091?utm_source=gb-gplus-sharePatent US6346091 - Detachable coil for aneurysm therapy
