Self-Contained Oxygen Rebreather With Semi-Permeable Membrane to Vent Excess Helium.
Patent, filed 11 Feb 97, patent 14 Jul 98,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A self-contained underwater breathing loop apparatus for an oxygen rebreather includes a breathing bag formed to act as a compliant volume and a semipermeable membrane arranged to divide the breathing bag into a first chamber and a second chamber. A breathing hose is connected between a mouthpiece and the first chamber of the breathing bag to conduct exhaust breath from the diver thereto. The semipermeable membrane is formed to allow helium in the divers exhaust breath to pass therethrough while preventing oxygen in the exhaust breath from being transported from the first chamber into the second chamber. A relief valve in the second chamber allows helium in the second chamber to be expelled into the water. A CO2 scrubber is in fluid communication with the first chamber of the breathing bag. A helium supply in fluid communication with the CO2 scrubber for supplying helium to the breathing loop through a metering valve. The helium supply preferably may be manually controlled by the diver to add helium in controlled amounts to the breathing loop to permit the diver to descend to a greater depth.
- Anatomy and Physiology
- Protective Equipment