PROBLEM TO BE SOLVED: To provide a medical device capable of enhancing safety by suppressing erroneous puncture, and a treatment method.SOLUTION: A medical device 1 for forming a hole at an oval fossa in a living body, includes: a needle part 30 provided with a puncture part 31 a protection tube 60 for slidably storing the needle part 30 an operating part 70 to which a proximal portion of the needle part 30 is connected and a move part 80 to which a proximal portion of the protective tube 60 is connected and that is movable with respect to the operating part 70. The operating part 70 includes an operation body 71 to which the needle part 30 is connected, and a release part 100 rotatably connected to the operation body 71. The release part 100 includes a first contact portion 105, and the move part 80 includes a first reception portion 86. The first contact portion 105 comes into contact with the first reception portion 86 to retain a state where the puncture part 31 is stored in the protection tube 60 and, when the contact of the first contact portion 105 with the first reception portion 86 is released, the puncture part 31 can project from the protection tube 60 relative to a distal side.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】誤穿刺を抑制して安全性を高めることができる医療デバイスおよび処置方法を提供する。【解決手段】生体内の卵円窩Oに孔を形成するための医療デバイス1であって、穿刺部31が設けられる針部30と、針部30を摺動可能に収容する保護管60と、針部30の近位部が連結される操作部70と、保護管60の近位部が連結され、操作部70に対して移動可能な移動部80とを有し、操作部70は、針部30が連結される操作本体部71と、操作本体部71に回転可能に連結される解除部100と、を有し、解除部100は第1の当接部105を有し、移動部80は第1の受け部86を有し、第1の当接部105が第1の受け部86と当接することで、穿刺部31が保護管60に収容された状態を維持し、第1の当接部105が第1の受け部86との当接を解除されていることで、穿刺部31が保護管60から相対的に遠位側へ突出可能である。【選択図】図2
