The puncture device is biased in a retracted position.
穿刺装置偏置在缩回的位置。
The opening is configured for travel about the needle to facilitate extension of the shield from a retracted position to an extended position.
开口构成为围绕着针头行进以便于防护件从回缩位置延伸至延伸位置。
The system of claim 1 wherein the at least one leading edge device is deployable, having a retracted position and at least one extended position.
该系统的权利要求1，其中至少有一个领先的设备部署，有收回的立场，至少有一个延长的立场。
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