In a guide wire is for a catheter, a core wire prepared by twisting a plurality of thin threads in which a leading end of the core wire is diametrically reduced to be a thinnest tip. A resin layer is coated on an outer surface of the core wire. The thinnest tip is treated by tightly uniting together...http://www.google.com.au/patents/US5897819?utm_source=gb-gplus-sharePatent US5897819 - Process of making a guide wire for a catheter
