Ventilation apparatus and mask

A ventilation mask configured to supply a ventilation gas mixture to a person, the ventilation mask comprising:

• a gas mixing device comprising an air outlet;
• a first gas feed arranged to supply a first gas to the gas mixing device;
• a combination carbon dioxide capturing system comprising a carbon dioxide pressure swing absorption system and a carbon dioxide temperature swing absorption system, wherein the combination carbon dioxide capturing system comprises:
• a first gas reservoir comprising an air inlet arranged to receive exhaled air from a person and to store carbon dioxide from the air received via the air inlet, the first gas reservoir further arranged to supply the stored carbon dioxide to the gas mixing device via a second gas feed;
• and
• a combination nitrogen capturing system comprising both a nitrogen pressure swing absorption system and a nitrogen temperature swing absorption system, wherein the combination nitrogen capturing system comprises:
• a second gas reservoir arranged to receive ambient air via a second gas reservoir inlet and further arranged to supply nitrogen reduced ambient air to the gas mixing device;
• wherein the gas mixing device is arranged to combine the first gas with the carbon dioxide in order to prepare the ventilation gas mixture, the gas mixing device further arranged to supply the ventilation gas mixture to a person via the air outlet.

A method of preparing a ventilation gas mixture comprising the steps of:

• supplying a first gas to a gas mixing device via a first gas feed;
• receiving exhaled air from a person via an air inlet;
• supplying the air received from the air inlet to a first gas reservoir within a combination carbon dioxide capturing system comprising a carbon dioxide pressure swing absorption system and a carbon dioxide temperature swing absorption system;
• storing carbon dioxide from the air exhaled by a person in the first gas reservoir;
• supplying the stored second gas to the gas mixing device via a second gas feed;
• and
• receiving ambient air in a second gas reservoir via a second gas reservoir inlet, wherein the second gas reservoir is within a combination nitrogen capturing system comprising a nitrogen pressure swing absorption system and a nitrogen temperature swing absorption system;
• supplying nitrogen reduced ambient air to the gas mixing device;
• wherein the gas mixing device combines the first gas with the carbon dioxide in order to prepare the ventilation gas mixture.