Abstract: Flush syringe assemblies capable of creating pulsatile movement of the plunger rod as it moves in the distal direction within a syringe barrel, while preventing overpressurization of the cathether are provided. An exemplary flush syringe assembly includes a syringe barrel with a first pulsing element and a chamber with flush solution, a plunger rod with a stopper and a second pulsing element that interacts with the first pulsing element to provide an engagement force that causes pulsatile movement of the plunger rod and a thumb press slidably attached to the plunger rod with a pulse control element. The pulse control element is compressible to create a compression force that is greater than the engagement force of the first pulsing element and the second pulsing element.

Abstract: Syringe assemblies for use in flush applications are provided. Syringe assemblies according to one aspect of the present invention include a plunger rod and a syringe barrel that incorporate one or more pulsing elements on the plunger rod or barrel that are rotatable to create pulsatile movement or continuous and unimpeded movement a plunger rod within a syringe barrel. One or more embodiments pertain to syringe assemblies permit both pulsatile movement of the plunger rod within the barrel and continuous and unimpeded movement of the plunger rod in the distal direction along substantially the entire length of the syringe barrel upon application of force to the plunger rod in only the distal direction. Methods of flushing a catheter are also provided.

Abstract: A single use syringe and a plunger rod locking device for such a syringe are provided. The locking device and plunger rod include features that cause the plunger rod to be locked with respect to the syringe barrel upon completion of an injection stroke. A cutting member is provided at the distal end of the locking device. The cutting member will penetrate, and thereby disable the stopper affixed to the plunger rod in an attempt to retract the plunger rod following the injection stroke. The locking device includes barbs for engaging the syringe barrel.

Abstract: A single use syringe and a plunger rod locking device for such a syringe are provided. The locking device and plunger rod include features that cause the plunger rod to be locked with respect to the syringe barrel upon completion of an injection stroke. A cutting member is provided at the distal end of the locking device. The cutting member will penetrate, and thereby disable the stopper affixed to the plunger rod in an attempt to retract the plunger rod following the injection stroke. The locking device includes barbs for engaging the syringe barrel.

Abstract: A needle stopper for use with a hypodermic syringe such as an arterial blood gas syringe includes a shell having a bottom, an open top and a needle-receiving chamber therebetween. The bottom is configured to support the needle stopper in an upright orientation. The needle-receiving chamber is dimensioned to receive needle cannula and to engage a needle hub connected to the cannula. The chamber is at least partly filled with a sealing material that can occlude the tip of a needle cannula. The upright orientation of the needle stopper enables one-handed insertion of the needle cannula into the needle-receiving chamber for occluding the needle tip. Engagement of the needle stopper with the needle hub enables safe and convenient separation of the needle hub and cannula from the syringe barrel for disposal. The tip of the syringe barrel then may be capped and sent to a laboratory for analysis of fluids therein.

Abstract: An operable syringe assembly includes a barrel having an inside surface describing a chamber for retaining fluid, an open barrel end, and a distal barrel end having a passageway therethrough in fluid communication with the chamber. A plunger rod includes an elongate body portion, a proximal end and a distal end with a stopper positioned at the distal end. The stopper slidably positioned in fluid-tight engagement in the barrel. A locking element is positioned in the barrel between the plunger rod and the inside surface of the barrel. Locking element includes a proximally and outwardly facing locking barb, a distally and inwardly facing resisting edge and an inwardly facing driving edge. Driving edge interacts with the plunger rod to move the locking element along the barrel as the stopper is advanced distally along the barrel.

Abstract: A syringe assembly includes a barrel having an inside surface describing a chamber for retaining fluid, an open proximal end and a distal barrel end having a passageway therethrough in fluid communication with the chamber. A plunger rod includes an elongate body portion, a proximal end and a distal end with a stopper at the distal end. The stopper is slidably positioned in fluid-tight engagement in the barrel. A locking element is positioned in the barrel between the plunger rod and the inside surface of the barrel. The locking element includes at least two proximally and outwardly facing non-parallel locking barbs, a distally and inwardly facing resisting edge and an inwardly facing driving edge. The driving edge is adaped to interact with the plunger rod to move the locking element along the barrel as the stopper is advanced distally along the barrel.