Abstract
SMAs has been put to first practical use in toy as shape recoverable wire and are now highly-popularized in wide range of areas such as cars and. electlical goods. Medical application has been expanded with increasing the minimally invasive therapy. SMAs have been consolidating core materials of medical devices such as guide wire, stent and so on. But many applications necessitate an extension of usual definition of fatigue And they are depend on surface condition of elements. In the case of Shape memory alloys, surface finishing are texture control, mechanical and chemical polishing. In specially, medical devices retained in the body should hanve good properties to the kink-resistance.
