| 摘要 |
<p>This invention is a phlebotomy system (10) including a needle assembly (12), a retraction assembly (16), and a cylindrical barrel (14). The needle assembly (12) includes a needle cannula (30) with a first and second ends, a needle sleeve (24) for supporting the needle cannula (30) and having a flared proximal end, and a hub (18) into which the needle sleeve (24) is inserted. The cylindrical barrel (14) is threadedly secured to the hub (18). The retraction assembly (16) includes a central plate (48) with a central opening through which the needle sleeve (24) extends. When a downward force is applied to the retraction assembly (16), the retraction assembly (16) is moved to an active position such that a locking port (64) is axially aligned with and thereby engages the needle sleeve. Hence, the locking port engages the flared proximal end of the needle sleeve (24) when the retraction (16) assembly is moved rearward and the needle cannula (30) is retracted into the barrel (14). In an alternative embodiment, the needle sleeve is threadedly engaged with the central opening of the retraction assembly and likewise results in retraction of the needle cannula into the barrel.</p> |
