A disclosed breathing hose is configured to duct inhaled and exhaled gas between a user and a rebreather apparatus. The breathing hose includes a non-collapsible flexible outer tube and a collapsible inner tube located within the non-collapsible flexible outer tube. The collapsible inner tube is configured to inflate to accommodate the exhaled gas of the user and to deflate to accommodate the inhaled gas of the user. The collapsible inner tube has a size that accommodates at least a portion of a breath volume of the user and may have a size that is configured to accommodate a maximum breath volume of the user. The collapsible inner tube is configured to act to maintain a constant total volume of gas in the lungs of the user and in the rebreather unit throughout a breathing cycle. The breathing hose may be part of a closed-circuit or semi closed-circuit rebreather apparatus.
Counterlung for a rebreathing apparatus
2022-04-20
Patent
Electronic Resource
English
PORTABLE REBREATHING SYSTEM WITH STAGED ADDITION OF OXYGEN ENRICHMENT
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