Medical cutting tool

Abstract

[Problem] To provide a method for manufacturing a medical cutting tool and a medical cutting tool that will not rust and that is capable of stably demonstrating high strength. [Solution] A working section ( 2 ) formed by a cemented carbide or ceramic is brazed to the tip of a shank part ( 1 ) formed by a round bar-shaped austenitic stainless steel, thereby constituting a cutting tool (A). The shank part ( 1 ) comprises a shank ( 1 a ), a neck ( 1 b ), and a joint ( 1 c ) to which the working section ( 2 ) is brazed. At least part of the stainless steel near the joint ( 1 c ) of the neck ( 11 b ) and in the joint ( 1 c ) has a fiber-like structure. The structure of the stainless steel in the joint ( 1 c ) on the working section ( 2 ) side has a granular structure.

1 . A medical cutting tool formed by brazing a working portion formed of cemented carbide or ceramics to a leading end of a shank portion formed by a round austenitic stainless steel bar,
 wherein the shank portion includes a shank, a neck formed to be continuous to the shank, and a joint which is formed to be continuous to the neck and which brazes the working portion formed of cemented carbide or ceramics, and   at least a portion of stainless steel in the joint and near the joint of the neck includes a structure of a fiber shape.   
     
     
         2 . The medical cutting tool according to  claim 1 , wherein a structure of the stainless steel in the joint at a side of the working portion is a granular structure.