Cochran Consulting, Inc.

Peter Francis Readey

Michael J Cochran

A re-breather that includes an inhalant counterlung (18) and an exhalant counterlung (20), with a mouthpiece (30) disposed therebetween. Gas flows from the counterlung (18) to the mouthpiece (30) for use by the diver, with exhalant from the diver directed to the counterlung (20). Gas forced out of the counterlung (20) is input to a canister/scrubber (10) for processing through a scrubbing material in an interior canister (14). The CO.sub.2 -depleted gas is passed back to the counterlung (18). The counterlung (18) has disposed therein a PPO.sub.2 sensor (68) which is directed toward a control system (66) for controlling a valve (46) to adjust the rate of flow of oxygen from a bottle (40) into the CO.sub.2 -depleted gas exiting the canister/scrubber 10 prior to input to the counterlung (18). The rate is varied to maintain the PPO.sub.2 level at a substantially constant level.

Rebreather having counterlung and a stepper-motor controlled variable

A multi-gas blending system for a diving profile is provided with three separate tanks, each having a different gas mix contained therein. The first tank, the primary tank, has a mix that is designed to be O.sub.2 rich for descending from the surface to a predetermined diving depth. At the predetermined diving depth, a switch is made by the diver and the system detects this switch. Prior to the switch, breathing parameters are calculated based upon the gas mix in the primary tank. Once the switch is detected, the calculation is performed on the mix in the second tank. This calculation continues until a predetermined amount of time has elapsed while the diver is on the secondary tank and the diver has begun an ascent and has passed a predefined depth. Once these two conditions occur, this is defined as a switch to a third gas mix, at which time the dive computer begins calculating the breathing parameters based upon a gas mix in a third tank. This is a decompression mixture.

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Plano, TX, United States of America

Peter Francis Readey