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 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 gas reservoir further arranged to supply the stored carbon dioxide to the gas mixing device via a second gas feed;
• and
• 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 gas reservoir;
• storing carbon dioxide from the air exhaled by a person in the 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;
• 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.

An apparatus for supplying a ventilation gas mixture, comprising:

• a first gas feed for supplying a first gas;
• a second gas feed for supplying a second gas;
• a gas mixing device, via which one of the gases can be added to the other gas to prepare the ventilation gas mixture;
• wherein the respective gas is deliverable to at least one of the first or second gas feeds from a respective first or second reservoir via a respective first or second pressure regulator;
• wherein at least one of the reservoirs is embodied as a filter which is configured to store of a gas from air exhaled by a person.

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

• providing a first gas to a gas mixing device;
• providing a second gas to a gas mixing device;
• mixing the first and second gases in the gas mixing device to produce a ventilation gas mixture;
• wherein the second gas is supplied to the gas mixing device from a filter, the filter comprising a gas from air exhaled by a person.