Can make the lung expand fully, used to control breathing, and is suitable for spontaneous breathing, convenient for heating and humidification of gas, less carbon dioxide inhalation.
Small ineffective cavity, low respiratory resistance, no carbon dioxide repeated inhalation when the fresh discharge is 1.5-3 times of the ventilation per minute.
Light and portable, reduce excessive distraction of mask or gas pipe, facial compression, and exorbitant disconnection.