VARIABLE APERTURE VENTING FOR RESPIRATORY MASK

摘要

A respiratory mask (200) having a variable flow venting is provided according to the invention, including a gas supply hose (209), a mask shell (206) adapted to output a gas to a respiratory system of a person, the mask shell (206) adapted to be connected to the gas supply hose (209), and an exhaust gas flow volume regulating device (220) which maintains a substantially constant gas flow volume out of the respiratory mask (200) independent of an internal gas pressure inside the respiratory mask (200).