< Topic >The thorn the medical application edged tool whose resistance is small is offered.SolutionsKnife and being the medical application edged tool which possesses the edge which includes the torokaru or blade attaching suture needle, in order to incise the body tissue the sharp edge it possesses with the plane surface section 2 which forms 1 and the aforementioned edge, color of plane surface section 2of a the part which parallels to the edge 1 differs from the color of other plane surface section 2b. The difference of aforementioned color, is based on the difference of thickness of oxide skin. The medical application edged tool which possesses the other edge is formed by the austenite type rustless steel, in order to incise the body tissue the sharp edge possesses with the plane surface section 2 which forms 1 and the edge, chrome content of plane surface section 2of a the part which parallels to the aforementioned edge is more than chrome content of other plane surface section 2b.【課題】刺通抵抗の小さい医療用刃物を提供する。【解決手段】ナイフやトロカール或いは刃付縫合針を含むエッジを有する医療用刃物であって、生体組織を切開するための鋭いエッジ1と、前記エッジを構成する平面部2とを有し、エッジ1に沿った一部の平面部2aの色が他の平面部2bの色と異なる。前記色の違いが、酸化被膜の厚さの違いに基づく。他のエッジを有する医療用刃物は、オーステナイト系ステンレス鋼によって構成され、生体組織を切開するための鋭いエッジ1と、エッジを構成する平面部2とを有し、前記エッジに沿った一部の平面部2aのクローム含有量が他の平面部2bのクローム含有量よりも多い。
