Core wire for guide wire and method for manufacturing the same

Abstract

Provided is a core wire for guide wire in which high rigidity can be attained even with a fine wire diameter so that pushability is improved while the core wire is prevented from fatigue deformation, and a method for manufacturing the core wire. This core wire 15 for guide wire is made of a Ti—Ni based alloy and has a wire diameter not larger than 0.5 mm and a Young's modulus not lower than 50 GPa. According to the manufacturing method, first, wire drawing is performed on a raw material M 0 so that the raw material M 0 is passed through a wire drawing dice 2 to be drawn to a certain length while the wire diameter of the core wire is reduced. Thus, a primary processed material M 1 is formed. After that, the primary processed material M 1 is hammered and drawn by swaging dices 5 and 5 so that a secondary processed material M 2 is formed. In this manner, the core wire 15 having a wire diameter not larger than 0.5 mm and a Young's modulus not lower than 50 GPa is manufactured.

1 . A core wire for guide wire,
 wherein the core wire
 is made of a Ti—Ni based alloy, 
 has a wire diameter not larger than 0.5 mm and 
 has a Young's modulus not lower than 50 GPa, and 
   wherein wire drawing and swaging are performed on the core wire.   
     
     
         2 . (canceled) 
     
     
         3 . The core wire of  claim 1 ,
 wherein the Ti—Ni based alloy is a work-hardened Ti—Ni based alloy whose texture has a microcrystalline structure.   
     
     
         4 . The core wire of  claim 1 ,
 wherein heat treatment as well as the wire drawing and the swaging is performed on the core wire.   
     
     
         5 . A method for manufacturing the core wire of  claim 1 , the method comprising:
 drawing a raw material made of a Ti—Ni based alloy, and then carrying out swaging to obtain a core wire having a wire diameter not larger than 0.5 mm and a Young's modulus not lower than 50 GPa.   
     
     
         6 . The method of  claim 4 , further comprising:
 performing heat treatment after the swaging.