Intravascular catheter assembly

摘要

An intravascular catheter assembly includes a catheter needle sheath having a retractable needle which is moved upon slidable movement of a handle member that is slidably mounted in the housing of the catheter needle sheath. The catheter needle safety sheath is insertable into a catheter or into a catheter adapter and backflow device which is in turn insertable into the catheter. The backflow device includes an elastomeric diaphragm disposed therein which re-seals upon withdrawal of the needle therefrom and advantageously prevents excessive fluid leakage from the catheter. The catheter needle safety sheath provides an improved means for disposing of the used needle since the handle member may be slidably moved in a rearward direction so as to retract the needle within the sheath. Both the catheter needle safety sheath as well as the catheter adapter and backflow device prevent unnecessary exposure to bodily fluids which may transmit diseases and thereby enhance the safety of the operators of these devices.