Edged medical cutting tool

Patent metadata

Field	Value
Publication number	US-10245060-B2
Application number	US-201514940318-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Sep 28, 2010
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

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 ).

First claim

The invention claimed is:

1. A method of producing a medical cutting tool for incising a biological tissue, the medical cutting tool being made of austenitic stainless steel, the method comprising the steps of:
forming a medical cutting tool having a cutting edge and plane portions that form the cutting edge press working;
performing an electrolytic polishing to the medical cutting tool formed by press working;
detecting by quantitative analysis using X-ray analysis, after the electrolytic polishing, a first chromium content per unit mass of an area of the plane portions which is adjacent to the edge and a second chromium content per unit mass of the other area on the plane portions which is not adjacent to the edge; and
determining that the cutting edge has sufficient sharpness when the first chromium content per unit mass is larger than the second chromium content per unit mass.

Assignees

• Mani Inc

Inventors

• Kato Kazuaki

Classifications

• A61B17/32 Primary

  Surgical cutting instruments ({A61B18/042 takes precedence; suture cutters A61B17/0467;} implements for ligaturing and cutting {A61B17/122, A61B17/12; instruments for rupturing the amniotic membrane A61B17/4208; specially adapted knives for eye surgery A61F9/0133}) · CPC title

• A61F2250/005

  differing in colour · CPC title

• A61B17/3211

  Surgical scalpels, knives; Accessories therefor · CPC title

• A61F9/0133

  Knives or scalpels specially adapted therefor · CPC title

• A61B2017/00526

  Methods of manufacturing · CPC title