Abstract: A nebulizer device having an atmosphere adjusting collar both slidably and rotatably mounted on the housing so as to adjust restriction of atmosphere inlet ports on the housing. An additional high oxygen port on the nebulizing nozzle is restricted by a flow rate adjusting collar. The flow rate adjusting collar is coupled to the atmosphere adjusting collar so as to maintain rate of flow as the atmospheric inlet is adjusted, but the atmospheric inlet is automatically adjusted as the oxygen flow rate is adjusted. An atmosphere entraining valve located downstream of the nebulizer housing provides additional entrainment of atmosphere to further reduce the fraction of inspired oxygen in the humidified air.

Abstract: A ventilation contamination control device for use on the expiratory line of a ventilator unit. The device couples to a contained vacuum source to provide a closed system that does not require the continuous, direct filtration of exhalation from the patient. The device includes a housing on which a flexible exhalation containment bag and a unidirectional check valve are mounted. The check valve permits inward atmospheric air flow during low exhalation periods but prevents outward contaiminated air flow. A bacteria filter unit is mounted on the housing to provide a filtered vent to the atmosphere in the event that the vacuum source or the check valve become obstructed or fail. An audible signal responds to such a failed condition.