Patent ID: 8900291
Filing Date: 2014-12-02
Classification: A61F,A61L,C23C,Y10T

Abstract:
1. A medical instrument, comprising: a substrate layer of which at least a surface comprises a metal material; (i) a carbon compound layer comprising silicon carbide, wherein the carbon compound layer is formed so as to coat at least part of the surface of the substrate layer; (ii) a first diamond-like carbon layer comprising silicon, wherein the first diamond-like carbon layer is free of fluorine and is formed so as to coat at least part of a surface of the carbon compound layer; and (iii) a second diamond-like carbon layer comprising fluorine, wherein the second diamond-like carbon layer is formed so as to coat at least part of a surface of the first diamond-like carbon layer, wherein the concentration of silicon in the (ii) first diamond-like carbon layer is 1% or more and 10% or less by atomic percentage, among the (i) carbon compound layer, the (ii) first diamond-like carbon layer, and the (iii) second diamond-like carbon layer, the medical instrument satisfies a relationship defined by the expression: A A A A an occurrence of cracking and separation of the (i) carbon compound layer, the (ii) first diamond-like carbon layer, and the (iii) second diamond-like carbon layer is effectively prevented in the medical instrument.