The invention relates to the technical field of
medical equipment, and discloses an external
oxygen supply method, an external-
oxygen-free
oxygen supply method and a quantitative
oxygen supply method, and provides three core
modes: in an external
oxygen supply mode, redundant oxygen during
extrusion is recycled and reused through a gas storage bag, and
overpressure is prevented in combination with a
pressure release valve; in the
oxygen supply mode without external oxygen, pure manual
extrusion air supply is achieved through a shell which can be replaced or arranged outside the air bag in a sleeving mode, and the device adapts to the oxygen-source-free environment; in the quantitative oxygen supply mode, the
inflatable inner bag is arranged in the air bag to accurately limit the
oxygen storage space in advance, and accurate control over the single
tidal volume is achieved. According to the invention, the
oxygen utilization rate is obviously improved, the use safety is guaranteed, and the application capability of the simple
respirator in precise ventilation and emergency scenes is expanded.