As for the detention needle assembly body, while possessing ahead the sharp needle in the point, while being locked to the basic end of the needle and the inside needle, in order the needle hub and the inside needle outside is locked to the basic end of the outside needle and the outside needle of the air which passes in the basic end of the needle hub and the outside needle hub, for lumen to communicate with the lumen of the outside needle, in order in the basic end or the side section of the tube and the outside needle hub which are connected, to communicate with the lumen of the outside needle, it was provided in opening, and the outside needle hub which are provided passed through the inside needle to the outside needle stateSo the needle and the outside needle inside the said the inside needle hub it has possessed with the lock expedient which can take with a lock cancellation state where lock state and a said lock state where it is locked vis-a-vis the outside needle hub are cancelled the function part which it moves operates according to those longitudinal directions and, in state.留置針組立体は、先端に鋭利な針先を有する内針と、内針の基端部に固定された内針ハブと、内針が挿通される中空の外針と、外針の基端部に固定された外針ハブと、外針ハブの基端部に、内腔が外針の内腔と連通するように接続されたチューブと、外針ハブの基端部または側方部に、外針の内腔と連通するように設けられた開口と、外針ハブに設けられ、内針を外針に挿通した挿通状態で該内針および外針をそれらの長手方向に沿って移動操作する操作部と、挿通状態で内針ハブが外針ハブに対し固定されるロック状態と、該ロック状態が解除されるロック解除状態とを取り得るロック手段とを有している。
