The invention relates to an emergency oxygen device for passenger of an aircraft, including a chemical oxygen generator including a chemical oxygen source and an activation unit for initiating a chemical reaction of the chemical oxygen source producing oxygen, at least two oxygen masks each connected with the chemical oxygen generator for receiving an oxygen fluid flow from the chemical oxygen generator after the activation unit has initiated the chemical reaction, and a mechanical activation assembly for activating the activation unit. The activation unit is activated by a mechanical force exerted onto an activation element of the activation unit and the mechanical activation assembly includes for each of the at least two oxygen masks a first mechanical connection from the activation element to a fixation element releasably mounted to the emergency oxygen device and a second mechanical connection from the fixation element to the oxygen mask.

A method is presented for determining onset of hypoxia of an occupant in an aircraft. The method includes measuring a physiological parameter of the occupant and comparing a value based on the physiological parameter with a threshold value. The method also includes measuring a pressure within a cabin of the aircraft and comparing the pressure with a pressure threshold value. The method also includes determining onset of hypoxia of the occupant based on both of the comparing steps. The method also includes communicating an alert to the occupant using a device detectable by one or more senses of the occupant. An apparatus is also provided for determining onset of hypoxia. The apparatus includes a pressure sensor to measure the pressure, a pulse oximeter to measure the physiological parameter, an alert device to communicate the alert to the occupant and a processor to perform one or more steps of the method.

A method for determining a characteristic such as partial pressure or percentage of a gaseous constituent in a first gas mixture flow in a flow chamber in which there is alternating flow in opposite directions between the first gas mixture flow and a second gas mixture flow. The steps may include a) introducing the first gas mixture flow into a sensing chamber when the first gas mixture flow flows in the flow chamber, b) preventing introduction of gas from the flow chamber into the sensing chamber at least when the second gas mixture flow flows in the flow chamber, c) sensing the characteristic of the first gas mixture flow in the sensing chamber.

A method for determining a characteristic such as partial pressure or percentage of a gaseous constituent in a first gas mixture flow in a flow chamber in which there is alternating flow in opposite directions between the first gas mixture flow and a second gas mixture flow. The steps may include a) introducing the first gas mixture flow into a sensing chamber when the first gas mixture flow flows in the flow chamber, b) preventing introduction of gas from the flow chamber into the sensing chamber at least when the second gas mixture flow flows in the flow chamber, c) sensing the characteristic of the first gas mixture flow in the sensing chamber.

A hypoxia recovery system capable of supplying breathing air with approximately 20% oxygen to a subject inside a mask off hypoxia training room without the use of a real world MD-1 aviator oxygen regulator, yet have the experience and realism of a real world MD-1 aviator oxygen regulator. The invention also teaches a method of hypoxia flight training, using said hypoxia recovery system.

A hypoxia recovery system capable of supplying breathing air with approximately 20% oxygen to a subject inside a mask off hypoxia training room without the use of a real world MD-1 aviator oxygen regulator, yet have the experience and realism of a real world MD-1 aviator oxygen regulator. The invention also teaches a method of hypoxia flight training, using said hypoxia recovery system.

A manifold for a chemical oxygen generator (COG) includes a locating plate configured to interface with a COG and a plenum body rotatably attached to the locking plate. The plenum body has an inlet for receiving oxygen and at least one output port in pneumatic communication with the inlet. The manifold includes a lock for immobilizing the plenum body with respect to the locating plate in at least a first position. In another aspect, a COG is provided. The COG may have a housing and a locking manifold.

A method of detecting hypoxia. Detecting hypoxia includes detecting, in exhaled breath, at least one indicator for hypoxia. The at least one indicator is selected from the group consisting of pentanal, 2-pentanone, 2-hexanone, 2-heptanone, 2-cyclopenten-1-one, and 4-butyrolactone.

A method of detecting hypoxia. Detecting hypoxia includes detecting, in exhaled breath, at least one indicator for hypoxia. The at least one indicator is selected from the group consisting of pentanal, 2-pentanone, 2-hexanone, 2-heptanone, 2-cyclopenten-1-one, and 4-butyrolactone.

A head armature for a respiratory system includes a cradle and a retention mechanism. The cradle is configured to receive a respiratory mask assembly in a stand-by position. The retention mechanism is configured to detachably connect the respiratory mask assembly with the head armature such that the respiratory mask assembly is movable from the stand-by position to a use position while connected to the head armature and such that the respiratory mask assembly is selectively detachable from the head armature in a stand-alone configuration whereby the respiratory mask assembly is disconnected from the head armature. In the use position, the respiratory mask assembly is configured to provide oxygen to a user. The head armature is configured to be worn on a head of the user such that the cradle is between the respiratory mask assembly and the user's head when the respiratory mask assembly is in the stand-by position.