Method of making a metallic thin wire for a medical tool

Abstract

In a method of making a metallic thin wire 1, one single metallic thin wire 2 is prepared to have a predetermined length with a middle portion of the one single metallic thin wire 2 as a fixed portion. Front and rear half portions of the one single metallic thin wire 2 are twisted with a tensile weight W applied to the front and rear half portions in the lengthwise direction. The one single metallic thin wire 2 is processed with a heat treatment to remove a residual stress. This provides the metallic thin wire 1 with a high rotation-following capability and high torque transmissibility, thus enabling artisans to usefully apply the metallic thin wire 1 to a main wire component 25 of a medical tool and equipment.

1 . A method of making a metallic thin wire comprising steps of:
 preparing one single metallic thin wire having a predetermined length with a middle portion of said one single metallic thin wire as a fixed portion;   twisting front and rear half portions of said one single metallic thin wire, while at the same time, applying a tensile weight to said front and rear half portions, said front and rear half portions being symmetrically located at both sides of said fixed portion; and   processing said one single metallic thin wire with a heat treatment to remove a residual stress from said one single metallic thin wire.   
   
   
       2 . The method of making a metallic thin wire according to  claim 1 , wherein said one single metallic thin wire is divided into a plurality of zones in the lengthwise direction, each of which is twisted in different numbers of turns. 
   
   
       3 . The method of making a metallic thin wire according to  claim 1 , wherein said one single metallic thin wire is divided into a plurality of zones in the lengthwise direction, each of which is processed with said heat treatment in varying degrees. 
   
   
       4 . The method of making a metallic thin wire according to  claim 1 , wherein an outer surface of said one single metallic thin wire is treated with an electrolytic polishing procedure after processed with said heat treatment.