| 摘要 |
A protective shield for a syringe and vacuum tube holder wherein the barrel of either instrument is provided with helical grooves, locking grooves and locking detents. The shield is provided with internal buttons which engage the helical grooves and permit longitudinal movement of the shield into a locked rearward or use position or moved forward into a protective position wherein a needle assembly projecting from the barrel is prevented from accidentally coming into contact with the user.
|
