In the illustrated embodiment, the moisture reservoir comprises a tube of gas-permeable, hygroscopic material. The exhalation flow path is into a blind axial bore of a spool like member having a series of transverse notches or cuts at the top and bottom which provide interspaces leading from the bore...http://www.google.fr/patents/US4200094?utm_source=gb-gplus-shareBrevet US4200094 - Apparatus for warming and moistening a respiration gas
Apparatus for warming and moistening a respiration gas
