PROBLEM TO BE SOLVED: To provide an indwelling needle device by which priming operation for filling the space between an inside needle and an outside needle with blood can be easily done and blood does not leak from a side hole of the outside needle during puncturing.SOLUTION: The inside needle 50 passes through the outside needle 30 and protrudes outside from the distal end of the outside needle in an initial position where a hub 40 is located at the front end side of the lumen of a shield 20 and the inside needle is stored in the lumen of the shield in a retracted position where the hub is located at the back end side of the lumen of the shield. The first side hole 31 is formed in the outer peripheral face of the outside needle and the second side hole 51 is formed in the outer peripheral face of the inside needle. The inner peripheral face of an area 33 including the first side hole of the outside needle comes into close contact with the outer peripheral face of the inside needle and the second side hole is located in the hub side from the area where the inside peripheral face of the outside needle and the outer peripheral face of the outside needle come in to close contact with each other when the hub is located in the initial position.COPYRIGHT: (C)2012,JPO&INPIT【課題】内針と外針との間の隙間を血液で満たすプライミング作業を容易に行うことができ、且つ、穿刺時に血液が外針の側孔から漏れ出すことがない留置針装置を提供する。【解決手段】ハブ40がシールド20の内腔の前端側に位置する初期位置において、内針50が外針30を貫通して外針の先端から外部に突出し、ハブがシールドの内腔の後端側に位置する後退位置において、内針がシールドの内腔内に収納される。外針の外周面に第1側孔31が形成されており、内針の外周面に第2側孔51が形成されている。ハブが初期位置にあるとき、外針の第1側孔を含む領域33の内周面が内針の外周面に密着し、第2側孔は外針の内周面と外針の前記外周面とが密着した領域よりもハブ側に位置する。【選択図】図5
