INTRAVENOUS ADMINISTRATION SET DELIVERING PRIMARY AND SECONDARY FLUIDS

摘要

In a fluid administration set for primary fluid whose flow rate is controlled by a pump, a device is provided for infusing secondary fluid through the adminstration set without mixing with the primary and secondary fluids. The device comprises a chamber (25) having first and second ends (33, 43) with the first end (43) including an output port. Within the chamber, first and second pistons (27, 29) are releasably locked in a tandem arrangement for slidable movement between first and second ends of the chamber. The pistons are moved in tandem from the first end of the chamber to a position in the chamber intermediate the ends so as to divide the chamber into upper and lower portions (57).