A needle assembly having a shield attached for quick release from the remainder of the needle assembly to be moved to cover the sharp tip. The shield can be disconnected by rotation of only about 90 degrees. When not needed to cover the sharp tip, the shield is held in a stowed position out of the way...http://www.google.com/patents/US20060276772?utm_source=gb-gplus-sharePatent US20060276772 - Bayonet release of safety shield for needle tip
