Edged medical cutting tool

Abstract

[Problem] To provide a medical cutting tool with low impalement resistance. [Solution] The edged medical cutting tool comprising a knife, trocar or cutting suture needle has a sharp edge ( 1 ) for incising living tissue and a flat part ( 2 ) that configures the edge, and the color of the portion of the flat part ( 2 a ) along the edge ( 1 ) differs from the color of the rest of the flat part ( 2 b ). The difference in color results from a difference in the thickness of an oxide film. Another edged medical cutting tool is configured of austenite stainless steel and has a sharp edge ( 1 ) for incising living tissue and a flat part ( 2 ) that configures the edge. The chrome content of the portion of the flat part ( 2 a ) along the edge is higher than the chrome content of the rest of the flat part ( 2 b ).

1 . A medical cutting tool comprising:
 a sharp edge for incising a biological tissue; and   plane portions that form the edge,   wherein a color of one plane portion along the edge is different from that of the other plane portion.   
     
     
         2 . The medical cutting tool according to  claim 1 , wherein a color difference between one plane portion along the edge and the other plane portion is based on a thickness difference of an oxide film. 
     
     
         3 . An edged medical cutting tool made of an austenitic stainless steel, comprising:
 a sharp edge for incising a biological tissue; and   plane portions that form the edge,   wherein a chromium content of one plane portion along the edge is larger than a chromium content of the other plane portion.