VASOOCCLUSIVE COIL WITH VARIABLE STIFFNESS

摘要

The variable stiffness vasoocclusive coil (10) is given variable stiffness along the length of the coil (10) by selectively heat treating certain segments of a primary or secondary coil. The primary coil can be selectively heat treated to form soft or deformable segments along the length of the coil (10), and can then be shaped into a secondary shape (16, 20) that is set by a heat treatment process. Distal regions of the coil (10) can also be heat treated to make the distal ends of the coil softer, more deformable, or less traumatic.