Evolution of the crossed-action intracranial aneurysm clip. Technical note.

The helical coiled-spring aneurysm clip with crossed legs evolved from clips designed by Mayfield and Scoville. The problems encountered during its development stimulated an evaluation of metals used in neurosurgery, the creation of implant standards, and the use of metals with greater strength and tissue compatibility; these metals later proved to be safe during magnetic resonance imaging.