Feasibility Study of the LVIS™ (Low-profile Visualized Intraluminal Support)Device

Inclusion Criteria: * Subject whose age is between 18 and 80 years old * Subject with unruptured wide neck, saccular,intracranial aneurysm, \< 20mm maximum diameter in any plane ( wide neck defined as neck width ≥ 4mm or dome to-neck ratio \< 2). * Subject's aneurysm arises from a parent vessel with a diameter of ≥ 2.5m and ≤ 4.5mm. * Subject or his/her legally authorized representative understands the nature of the procedure and provides signed informed consent form. * Subject is willing to return to the investigational site for the 30- day and 6-month follow-up evaluations Exclusion Criteria: * Subject who presents with ruptured aneurysm, unless rupture occured 30 days or more prior to screening. * Subject who presents with an intracranial mass or currently undergoing radiation therapy for carcinoma of the head or neck region. * Subject with an International Normalized Ratio (INR)≥ 1.5 * Subject with serum creatinine level \>2mg/dl at time of enrollment * Subject with known allergies to nickel-titanium metal * Subject with known allergies to aspirin, heparin, ticlopidine, or clopidogrel * Subject with a life threatening allergy to contrast(unless treatment for allergy is tolerated) * Subject who has a known cardiac disorder, likely to be associated with cardioembolic symptoms such as atrial fibrillation * Subject with any condition which in the opinion of the treating physician would place the subject at a high risk of embolic stroke * Subject who is currently participat…