Patent ID: 11878148
Assignee: BECTON, DICKINSON AND COMPANY
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A syringe assembly comprising:
a barrel including a side wall having an inside surface defining a chamber for retaining a predetermined amount of pre-filled fluid,
an open proximal end and a distal end including a distal wall with a tip extending distally therefrom having a passageway therethrough in fluid communication with said chamber;
a plunger rod disposed within the barrel, the plunger rod comprising a distal end, a proximal end and an outside surface, wherein the distal end of the plunger rod including a stopper having a distal face, a plunger rod body extending from the proximal end of the plunger rod to the distal end of the plunger rod; and
one or more retention elements disposed on the plunger rod at a length from the distal end of the plunger rod configured to provide increased mechanical interference between the plunger rod and barrel when a force is applied in a proximal direction to prevent the pre-filled fluid from entering a non-sterile area of the syringe assembly, wherein the one or more retention elements comprise a first component having two side walls being level with a straight wall of a crossbar, a sloped top surface having a grade in a range from 1%-100%, one or more flat portions oriented parallel to a longitudinal axis, and a ledge in the sloped top surface that forms a flat end of oriented perpendicular to the longitudinal axis.