NASA NTRS · 19640000029
Device induces lungs to maintain known constant pressure
Abstract
This device requires the use of thoracic muscles to maintain prescribed air pressure in the lungs for brief periods. It consists of a clear plastic hollow cylinder fitted with a mouthpiece, a spring-loaded piston, and a small vent for escaping air when exhalation into the mouthpiece displaces the piston.
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Lippitt, M. W., Reed, J. H.. 1964-07-01. Device induces lungs to maintain known constant pressure. https://ntrs.nasa.gov/citations/19640000029
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