The Perneczky Aneurysm Clip is a revolutionary product from adeoradeor ( registered trademark) developed in close cooperation with Prof. Axel Perneczky for effectively solving visual obstruction problems. The device is designed to makes sure that the Clip-Applier and Clip-Remover enters (be inside) inside the clip and is smaller than the clip itself. Since the clip is prevented form covering during applying or removing instrument, the clip always stays in view of the surgeon. The device meets the aneurysm surgery challenge of the narrow spaces between the anatomical structures of the basal cisterns.