PROBLEM TO BE SOLVED: To provide a cannula device which can be easily attached to and detached from a body cavity while preventing damage to a tissue and can introduce a suture. A device used for inserting or removing an instrument or the like into a body cavity in an endoscopic procedure, comprising a cannula having a tubular portion and a flange, and an obturator provided with a needle portion and a grip portion. .. In the cannula, the axial length of the cylinder is shorter than the length of the needle of the obturator, and with the grip of the obturator and the flange of the cannula in contact, the tip of the needle is exposed and around the cylinder. At least one node having a top having an outer diameter larger than the outer diameter of the cylinder is provided, and the top is provided closer to the root side of the cylinder than to the tip side of the cylinder. The cannula and obturator can be detachably attached by screwing the female screw portion provided on the inner peripheral wall at the end of the flange and the male screw portion provided on the outer peripheral wall at the base of the needle part by 1/3 to 1 turn. It is fixed. [Selection diagram] Fig. 1【課題】組織の損傷を防止しつつ、体腔内への取付け・取外しを容易に行うことができ、しかも縫合糸の導入が可能なカニューラ装置を提供する。【解決手段】内視鏡視下手技において、体腔内への器具等の挿入又は抜去に用いる装置であって、筒部およびフランジを備えたカニューラと、針部および把持部を備えたオブチュレータから成る。カニューラは、筒部の軸方向の長さが、オブチュレータの針部の長さより短く、オブチュレータの把持部とカニューラのフランジが当接した状態で、針部の先端が露出し、筒部の周囲に筒部の外径より大きな外径の頂部を有する少なくとも１つの節部が設けられ、頂部は、筒部の先端部側よりも筒部の根元部側に寄せて設けられる。フランジの端部の内周壁に設けられた雌螺子部と針部の根元の外周壁に設けられた雄螺子部が、１／３～１回転螺合することにより、カニューラとオブチュレータが脱着自在に固定される。【選択図】図１
