Problem to be solved: to provide a hand-held member and a medical device and a treatment method capable of discriminating a long body direction at the hand portion.A long body 10 having a shape part 10A showing one direction at least at the tip portion inserted into the body andThe hand-held member 20 detachable from the hand of the long bodyMedical device havingLong bodyA long body display 11 having a circumferential direction is provided.The handheld memberThe handlebar member side display part 21 provided corresponding to the shape part 10a of the long body 10 andThe medical device is provided with a directional display portion 22 for displaying the circumferential position of the hand member 20 with respect to the circumferential position of the handlebar member side display portion 21.Diagram【課題】手元部において長尺体の向きを判別できる持手部材と医療デバイス及び処置方法を提供する。【解決手段】生体に挿入される少なくとも先端部に一つの方向を示す形状部１０ａを有する長尺体１０と、長尺体１０の手元部に着脱可能な持手部材２０と、を有する医療デバイスであって、長尺体１０は、周方向の向きを示す長尺体側表示部１１を有し、持手部材２０は、長尺体１０の形状部１０ａに対応して設けられる持手部材側表示部２１と、持手部材側表示部２１の周方向位置に対する持手部材２０の周方向位置を表示する向き表示部２２とを有する医療デバイスである。【選択図】図４
