Abstract: A gas delivery apparatus configured for use with a mechanical ventilator having an atmospheric inlet for drawing in atmospheric gas includes a connecting device configured to connect to an oxygen supply and an air supply and to deliver mixed air and oxygen gas to the atmospheric inlet of the mechanical ventilator. The connecting device further includes a user control for adjusting a fraction of oxygen in the mixed air and oxygen gas. The connecting device comprises a reservoir configured to hold a volume of the mixed air and oxygen gas.

Abstract: This disclosure relates to a self-contained recirculating toilet system which includes a toilet bowl having a built-in flush pump and a waste-discharge macerator pump with the discharge of the macerator pump being connected to a holding tank unit for delivering raw waste into a raw-waste compartment thereof. The raw waste is periodically pumped from the raw-waste compartment to a combined sterilization and flocculation cell unit after which the treated liquid is returned to the holding-tank unit and after solids float over weir by virtue of gaseous suspension from the treatment in the cells and aided by the outward flow through a discharge slit the remaining clarified and sterilized liquid is directed into a flush-water compartment of the holding-tank unit for use in the next flushing of the toilet. The system provides for repeated use of the same water for multiple toilet flushing.