PROBLEM TO BE SOLVED: To improve hemostasis performance and penetrating properties of a valve mechanism of a catheter assembly.SOLUTION: The catheter assembly 10 includes a tubular external needle 12, an external needle hub 14 having a flow channel 26 communicating with the inside of the external needle 12 in the inside, a hemostasis valve 46 having a blocking membrane 58 interrupting the circulation of a fluid and a slit 60 partially opening and closing the blocking membrane 58, and a plug 50 provided closer to a proximal end side than the blocking membrane 58 and inserted into the slit 60 by the movement toward the tip. The plug 50 includes a pair of notch parts 70 extending in the axial direction from the distal end, and a pair of insertion piece parts 72 divided by the notch parts 70 abut on the blocking membrane 58 with the movement of the plug 50 in the tip direction and deform elastically to get close to the slit 60.COPYRIGHT: (C)2013,JPO&INPIT【課題】カテーテル組立体の弁機構の止血性及び貫通性を向上させる。【解決手段】カテーテル組立体10は、管状の外針12と、外針12内に連通する流路26を内部に有する外針ハブ14と、流体の流通を遮断する閉塞膜58及び該閉塞膜58を部分的に開閉可能なスリット60を有する止血弁46と、閉塞膜58よりも基端側に配置され先端方向への移動によってスリット60を挿通するプラグ50と、を備える。プラグ50は、先端部から軸方向に延在する一対の切り欠き部70を備え、プラグ50の先端方向への移動にともない、切り欠き部70によって分割された一対の挿通片部72が閉塞膜58に当接して、スリット60に寄るように弾性変形する。【選択図】図4
