The coil causes aneurysm thrombosis and is left in the aneurysm indefinitely. Surgical clipping needs open surgery and is performed under general anesthesia. To visualize the aneurysm, the brain is slowly retracted. To stop blood flow into the aneurysm, a tiny clip is inserted across its neck. A small metal clip is used to halt blood flow into the aneurysm during microsurgical clipping. To reach the aneurysm in the brain, a craniotomy is performed to make an opening in the skull. The clip is placed on the aneurysm's neck (opening) to impede blood flow, and it stays inside the brain. The clip functions similarly to a miniature coil-spring clothespin, with the blades remaining tightly closed until pressure is applied to open them. The titanium clips are permanently attached to the artery.