Vascular expandable devices

An expandable device implantable across an aneurysm in a blood vessel of a patient, the expandable device comprising:

• a generally tubular structure formed of a plurality of braided metallic strands, the tubular structure having a proximal end, a distal end, and a length between the proximal end and the distal end;
• a compressed state in which the expandable device has a compressed state diameter of 0.027 inches or less;
• an expanded state in which the expandable device has an expanded state diameter corresponding to the expandable device, the expanded state diameter being 1.75 mm or more;
• wherein each of the plurality of metallic strands has an oxide layer having a thickness of about 400 angstroms or less, and
• wherein the tubular structure is configured to self-expand from the compressed state to the expanded state.