Abstract: A catheter and introducer needle assembly with needle shield that is connected to the needle hub by a pleated tether. The tether defines a plurality of holes therein to allow the introducer needle to extend through the tether. The tether prevents unwanted proximal movement of the needle with respect to the needle shield once the needle has been withdrawn into the needle shield.

Abstract: A mechanical latching device is provided for threaded connections, such as those found in a medical syringe. The connections each have a thread profile with crest and root elements. At least one flexible finger or projection extends outwardly from within one of the root portions and an outwardly extending ridge is provided on the second threaded member extending from the ridge. Interference with normal threading movements between connection elements is abated, while resistance is provided to unthreading manipulations of the connections.

Abstract: The present invention relates to a needle shield assembly attachable to a syringe body or other fluid delivery system to protect a user from accidental and unintentional puncture. The safety needle assembly is commonly mounted to a syringe body, preferably by a luer lock adapter, or to other fluid delivery devices used in the medical field. The present invention resides in the use of a retractable tube lock that dictates the covering and uncovering of the sharp tip of a needle or a blunt tip of a cannula by communicating with a stationary hollow tube which houses a retractable hollow tube that axially slips in and out of the stationary tube.