| 摘要 |
A blood collection assembly includes a needle cannula with an intravenous end and a non-patient end. The cannula is mounted to a needle holder so that the non-patient-end projects into the holder. A safety shield is telescoped over the needle cannula and is movable from a proximal position where the non-patient end of the cannula is exposed to a distal position where the non-patient end of the cannula is shielded. The safety shield is configured to be passively actuated and propelled into the distal position in response to insertion of a blood collection tube into the holder. However, a slide back actuator extends from the safety shield to permit the shield to be retracted into a proximal position during use and before the safety shield is locked in the distal position.
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