In a surgical instrument (10) having an elongate inner tubular member (20) and an elongate outer tubular member (11), the inner tubular member is movably received within the outer tubular member. And The surgical instrument also includes a diamond-like carbon (DLC) surface disposed to be between the inner tubular member and the outer tubular member. In further embodiments, the DLC surface (31/32) is formed on the outer surface of the inner tubular member, the inner surface of the outer tubular member, or both. In a further embodiment, the inner tubular member comprises a cutting edge (24) disposed in its distal region and the outer tubular member comprises a distal opening (15) therein. The opening is positioned to expose the cutting edge of the inner tubular member and cooperate with the cutting edge of the inner tubular member to allow shearing or cutting of tissue.細長い内側管状部材（２０）と細長い外側管状部材（１１）とを有する外科用機器（１０）において、内側管状部材が、外側管状部材の中に、動くことができるように収容されることを特徴とする。外科用機器は、また、内側管状部材と外側管状部材との間にくるように配設されたダイヤモンドライクカーボン（ＤＬＣ）表面を備える。更なる実施形態では、ＤＬＣ表面（３１／３２）は、内側管状部材の外側表面、若しくは外側管状部材の内側表面、又はその両方に形成される。更なる実施形態では、内側管状部材は、その遠位領域に配設された刃先（２４）を備え、外側管状部材は、そこに遠位開口（１５）を備える。開口は、内側管状部材の刃先を露出させると共に内側管状部材の刃先と協働して組織のせん断又は切断を可能にするように位置付けられている。
