SYSTEM FOR PREVENTING NEEDLE DISPLACEMENT IN SUBCUTANEOUS VENOUS ACCESS PORTS

摘要

A threaded, dual needle system is securely attached to a modifiedsubcutaneous venous access port having an internal reservoir, used for intravenousdrug therapy particularly in human cancer treatment. A hollow outer needle ispaired with a removable, male-threaded solid inner point and inserted through thepatient's tissue and through the port's protective, self-sealind silicon septum, andthe solid inner needle is then removed, while the outer needle is left in place. Next,a hollow inner needle is threaded through the outer needle to a depth sufficient tointerlock with a female-threaded port receptacle at the base of the port's fluidreservoir and rotated to install. Optional additional threading can permit securingthe outer needle to the two inner needles. A breakaway system preventsdisplacement from unintented pulling of the flow-line. The system thus providesadditional protection against needle displacement from venous access ports, theresulting leakage, and the problems caused thereby.