| 摘要 |
A syringe is disclosed which includes a needle body having a proximal end and a distal end, a needle attached to the distal end of the needle body, a plunger for drawing fluid into the needle body through the needle, and a protective sheath configured and dimensioned to be positioned about the needle body and movable between a first distal position whereby the needle is shielded by the sheath and a proximal position whereby the needle is exposed. A system of slots and pegs is provided to releasably retain the protective sheath in the first distal position and to releasably retain the protective sheath in the proximal position. Also disclosed is an improved locking system which includes a pair of opposed locking struts fixed to the sheath at respective proximal and distal ends thereof to securely retain and lock the protective sheath in a second distal position after use to prevent unwanted contact with the needle.
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