Quest Medical, Inc.

Simplec Manufacturing Company

James E Hudson, Jr

Andrew P Mattson

Thomas P Robinson

Don M Killman

A volumetric infusion actuator providing a slot means for receiving a valved cassette having exposed valve pads. An actuation means for automatically moving individual arms into and out of engagement with the valve pads according to a predetermined cycle which governs flow through the cassette.

Volumetric infusion actuator

Three embodiments of a metering unit (10, 140, 200) are provided for metering fluid from a container (14) for infusion into a patient. The first embodiment of the metering unit (10) includes a cassette (26) formed of halves (28, 30). The halves (28, 30) each have a concave reservoir portion (36) formed on the inner face (32) thereon. Entry and exit channels (38, 42) extend from the reservoir portions adjacent entry and exit orifices (40, 44). Entry and exit port portions (46, 50) are formed in each half (28, 30). Flexible entry and exit valves (58, 64, 86 and 88) are movable between an open position, permitting fluid to flow through the orifices, to a closed position, preventing fluid from flowing through the orifices. The halves are separated by a flexible diaphragm (70) which divides a reservoir (76) into first and second compartments (78, 80). One entry valve is opened to permit fluid from the entry port (82) to flow into one compartment, the fluid flowing into the compartment moving the flexible diaphragm to force the fluid in the other compartment out to the exit port (84). The position of the valves is then interchanged, permitting fluid to flow into the other compartment and forcing the fluid in the first compartment into the exit port. A cassette (206) in the third embodiment of the unit (200) includes identical halves (208, 210) sonically bonded together. A diaphragm (296) separates parallel channels (218, 222) to reduce head pressure channel volume variations. Grooves (228, 230) are provided in the reservoir portions (216) to prevent fluid trappage between the diaphragm and portion wall. In all cassette embodiments, an activating frame operating the cassette prevents the positioning of all valves in the open position simultaneously.

Volumetric metering unit for intravenous fluid addition

Sets of lamps arranged in adjacent opposed arrowhead configurations with each lamp energized by means of individual switching transistors having base drive voltages coupled through a multi-position switch to timing signals. The timing signals are generated by sequentially actuated flip-flops energized in response to impulses from a master clock and gating circuitry. Opposite directions are indicated by selectively energizing three sets of lamps forming three adjacent arrowheads, sequentially, in one direction, three similar sets in another direction, or by steadily illuminating one set of lamps forming an arrowhead while sequentially energizing lamps forming a shaft.

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Dallas, TX, United States of America

James E Hudson, Jr