A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
128/90
A61F 5/14 (2006.01) A61M 5/14 (2006.01) A61M 5/315 (2006.01)
Patent
CA 1271384
ABSTRACT 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 having first and second ends with the first end including an output port. Within the chamber, first and second pistons 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. A first means is provided for sliding the pistons along the length of the chamber and for rotating the second piston between first and second rotational positions. A second means responsive to the rotation of the second piston decouples the first and second pistons so that the first means may move the second piston away from the first piston. A third means is provided for communicating primary fluid from an upstream section of the administration set to a centrally located bore in the second piston so as to allow the primary fluid to fill the volume created by the decoupling of the second piston from the first piston. A fourth means is provided for locking the second piston in a position within the chamber such that delivery of pressurized fluid by the pump into the volume between the decoupled first and second piston causes the first piston to slidably move toward the first end of the chamber, thereby metering the secondary fluid into the patient.
527590
Abbott Laboratories
Goudreau Gage Dubuc
Schweizer Russell J.
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