Abstract: A device comprises an upper section with a unidirectional flow valve and a lower section with a surface for adhering to a container with its own unidirectional flow valve and a passageway to circumscribe the container's unidirectional flow valve. A middle section of the device has a plurality of walls of which some may be at substantially acute angles that couple the upper section to the lower section to form a cavity between the unidirectional flow valve and the passageway.

Abstract: A device comprising a first unidirectional flow valve not substantially in contact with ambient air, a second unidirectional flow valve whose air-flows terminate in ambient air and an elastically resilient chamber coupling the first unidirectional flow valve to the second unidirectional flow valve to permit air-flow from the first unidirectional flow valve to the ambient. Intermittent application of pressure to the chamber moves air from the first unidirectional flow valve to the second unidirectional flow valve.

Abstract: An intravenous catheter which protects a clinician from accidental puncture from needle stick injuries which may result in the dangerous transfer of infectious diseases is disclosed which is easily operated with one hand and is compact for easy disposal.