Beatmungsmaske mit Exspirations-, Inspirations- und Verdünnungsventilen

摘要

A mask assembly (10) has face piece (20); gas reservoir (40) for holding gas; and housing (30) attached to face piece and reservoir bag. The housing has gas intake port, one-way expiratory valve (64) that opens in direction of expiratory flow leading to atmosphere, one-way inspiratory valve (54) between face piece and gas reservoir, and dilution valve (72). The mask assembly comprises face piece; gas reservoir for holding gas; and housing attached to the face piece and reservoir bag. The housing has gas intake port, one-way expiratory valve that opens in direction of expiratory flow leading to atmosphere, one-way inspiratory valve between face piece and gas reservoir, and dilution valve that opens and allows room air to enter the housing. The dilution valve has a cracking pressure greater than the pressure needed to empty the reservoir bag during inspiration and a resistance of =4 cm water/s at 60 L/minute. An independent claim is also included for a method for delivering gas through inhalation comprising flowing gas from gas source to the subject's respiratory system; and diluting the gas with room air during a respiratory cycle without inducing fatigue such that the gas is inspired at the beginning of inspiration and room air fills the anatomical dead space of the respiratory system.