Patent ID: 7662170
Filing Date: 2010-02-16
Classification: A61B,A61C

Abstract:
1. A medical needle or a cutting tool comprising: (a) a fiber shave structure comprised of austenite stainless steel containing 1% to 6% of molybdenum or 13% to 25% of chromium, said structure having a surface; (b) a hardened layer disposed on/in the fiber shave structure, said hardened layer having been formed via a carburization process comprising placing the fiber shave structure in a carburizing gas atmosphere maintained at equal to or lower than 500° C., so as to cause penetration of carbon atoms into the surface of the fiber shave structure, and then removing some portion of the depth of the hardened layer, so as to form a hardened layer having a thickness of 5 micrometers to 70 micrometers; (c) a dark layer formed on an outer most surface of the hardened layer, said dark layer providing a non-reflective surface; and (d) a silicon coating formed on the dark layer.