A disclosed breathing hose is configured to duct inhaled and exhaled gas between a user and a rebreather apparatus. The breathing hose includes a non-collapsible flexible outer tube and a collapsible inner tube located within the non-collapsible flexible outer tube. The collapsible inner tube is configured to inflate to accommodate the exhaled gas of the user and to deflate to accommodate the inhaled gas of the user. The collapsible inner tube has a size that accommodates at least a portion of a breath volume of the user and may have a size that is configured to accommodate a maximum breath volume of the user. The collapsible inner tube is configured to act to maintain a constant total volume of gas in the lungs of the user and in the rebreather unit throughout a breathing cycle. The breathing hose may be part of a closed-circuit or semi closed-circuit rebreather apparatus.

There is provided a humidifier for a respiratory therapy system that includes a humidification chamber having an inner wall spaced from an outer wall to form a wall cavity between the inner and outer walls. A gas flow path is located within the wall cavity. Gas, such as air, flows along the gas flow path from an inlet to the humidification chamber to an outlet of the humidification chamber. Optionally, the gas flow path may follow a helical route through the wall cavity.

A breathing equipment training device and a method for breathing training using a breathing equipment training device. The breathing equipment training device includes a shell and a diaphragm. The shell includes a first opening and a second opening, the first opening configured to be inserted into a breathing opening in a mask to form a connection with the breathing opening of the mask, and the second opening configured to be exposed to ambient air. The diaphragm is positioned in an inner cavity of the shell about the second opening, and configured to impede airflow into the shell through the second opening.

A breathing equipment training device and a method for breathing training using a breathing equipment training device. The breathing equipment training device includes a shell and a diaphragm. The shell includes a first opening and a second opening, the first opening configured to be inserted into a breathing opening in a mask to form a connection with the breathing opening of the mask, and the second opening configured to be exposed to ambient air. The diaphragm is positioned in an inner cavity of the shell about the second opening, and configured to impede airflow into the shell through the second opening.

A breathing gas delivery system comprising a gas flow controller and at least one breathing apparatus. The gas flow controller has a body having an on/off switch, at least one gas input, and at least one gas output. The breathing apparatus comprises a T-shaped gas input having a body with two arms and a free end, a breathing bag coupled to the free end of the T-shaped gas input, a length of tubing having two opposed ends, wherein one end is coupled to the other arm of the T-shaped gas input, a filter coupled the length of tubing, and a nasal assembly coupled to the filter.

A breathing gas delivery system comprising a gas flow controller and at least one breathing apparatus. The gas flow controller has a body having an on/off switch, at least one gas input, and at least one gas output. The breathing apparatus comprises a T-shaped gas input having a body with two arms and a free end, a breathing bag coupled to the free end of the T-shaped gas input, a length of tubing having two opposed ends, wherein one end is coupled to the other arm of the T-shaped gas input, a filter coupled the length of tubing, and a nasal assembly coupled to the filter.

A mask includes a support member that is configured to extend across at least a portion of a face of a user and a heater connected to the support member.

A mask includes a support member that is configured to extend across at least a portion of a face of a user and a heater connected to the support member.

Disclosed are a smart mask which performs various sensing of a breathing characteristic, etc. and a smart mask-based service system which implements a service through a communication network by using a smart mask. The smart mask includes a differential pressure unit configured to provide a differential pressure signal corresponding to a difference between an atmospheric pressure and an internal pressure; a characteristic extraction unit configured to extract breathing characteristic information, representing a breathing characteristic, from the differential pressure signal; an electric fan configured to be driven for intake; a communication module configured to perform communication with an outside; and a control unit configured to drive the electric fan and transmit the breathing characteristic information to the outside through the communication module.

Disclosed are a smart mask which performs various sensing of a breathing characteristic, etc. and a smart mask-based service system which implements a service through a communication network by using a smart mask. The smart mask includes a differential pressure unit configured to provide a differential pressure signal corresponding to a difference between an atmospheric pressure and an internal pressure; a characteristic extraction unit configured to extract breathing characteristic information, representing a breathing characteristic, from the differential pressure signal; an electric fan configured to be driven for intake; a communication module configured to perform communication with an outside; and a control unit configured to drive the electric fan and transmit the breathing characteristic information to the outside through the communication module.