A Feasibility Study to Evaluate the Safety and Effectiveness of Implantation of Flowise Cerebral Flow Diverter (Flowise)

Inclusion Criteria: * Functional neurological state ≤2 mRS * Unruptured wide-neck aneurysm in the internal carotid artery has a size \>8mm, a neck ≥4mm, or dome/neck ratio \<2 * Parent artery with diameter ≥3.25mm and ≤4.5mm * Patient willing to provide written informed consent and comply with follow-up requirements Exclusion Criteria: * Intracranial hemorrhage within 30 days * Untreated ruptured intracranial aneurysm * ≥1 intracranial aneurysm except the target one requires treatment within 6 months * Immunosuppressive disease * Active infectious disease (e.g. endocarditis, meningitis) * Platelet count \< 100 x 103 cells/mm3 * Female of child-bearing potential who are unable to take adequate contraceptive precautions, are known to be pregnant, or are currently breastfeeding an infant.