Patent ID: 6895961

Claim:
A method for the autonomous production, enrichment and supply of breathing gas to a diver, the method comprising the steps of: continuously conveying between at least two pressurized containers a breathing gas mixture which comprises an inert gas and oxygen, wherein the at least two pressurized containers are a part of a closed circuit system; conveying the breathing gas mixture from one of the at least two pressurized containers to a breathing area; exhaled breathing gas mixture is then conveyed to a carbon dioxide absorption filter by means of a low pressure membrane pump wherein a portion of carbon dioxide is removed from the breathing gas mixture exhaled by the diver by the carbon dioxide filter; enriching the exhaled breathing gas mixture with oxygen, based on constant dosage according to an admissible partial oxygen pressure for the respective depth, to compensate for loss; exiting a portion of the breathing gas mixture, the portion of the breathing gas based on an overdosing and constant dosage principle; transferring the exiting portion of the breathing gas to another one of the at least two pressurized containers and storing the exiting portion in the another one of the at least two pressurized containers at a pressure of between 220 and 450 bar; and reversing the flow of the continuously conveyed breathing gas when the another of the at least two pressurized tanks becomes full such that the continuously conveyed breathing gas is transferred to the less full one of the at least two pressurized containers.