PROBLEM TO BE SOLVED: To prevent a user from receiving a needle stick during mounting of a safety pen needle assembly.SOLUTION: An outer abluminal surface of a hub 12 and an inner luminal surface of a shield 16 are formed with cooperating thread elements to permit relative rotation between the hub and the shield. In an initial state, the cooperating thread elements are in threaded engagement with the shield being positioned relative to the hub with a distal end of the shield sidewall being located distally of a distal end of the needle 14. Also, the shield and the hub are configured with a rotation-resistance arrangement which inhibits relative rotation between the hub and the shield. The rotation-resistance arrangement is surmountable to allow relative rotation between the hub and the shield with an at least threshold amount of torque being applied, the threshold amount of torque being greater than required to mount the pen needle assembly onto an injector body. The safety pen needle assembly 10 can be provided having a shield threaded onto a hub with the assembly being mountable with the needle being in a shielded state, which minimizes the possibility of needle stick during mounting of the safety pen needle assembly.COPYRIGHT: (C)2013,JPO&INPIT【課題】安全ペンニードルアセンブリの取り付けの間の、ユーザーのニードルの突き刺しを防ぐ。【解決手段】ハブ12の外側反管腔側面およびシールド16の内側管腔面は、協働するねじ山要素を有し、ハブとシールドの相対回転を可能にする。初期状態では、シールド側壁の末端部がニードル14の末端部の末端側に位置づけられるように、シールドがハブに対してねじ係合される。また、ハブとシールドは、相対回転を妨げる回転抵抗機構を有して構成される。閾値量のトルクが加えられたとき、ハブとシールドとの間の相対回転は可能となり、閾値量は、注射器本体へペンニードルアセンブリを取り付けるのに必要とされるよりも大きい。安全ペンニードルアセンブリは10、ハブに接触するねじが切られたシールドを有し、ニードルはシールド状態にて取り付け可能であり、突き刺しの可能性を最小限にする。【選択図】図1
