A discharger structure on earloop facemasks includes at least one opening hole on an earloop facemask covered by a cover. The cover is in a streamline shape and has a passage space for airflow. A check valve is disposed in the opening hole at an inner side of the cover, and the cover further has a discharging hole at an opposite side of the check valve, defining an area within the passage space between the check valve and the discharging hole for airflow. Thereby the check valve is closed by a diaphragm when air pressure within the facemask is negative, and the check valve is opened by the diaphragm when air pressure within the facemask is positive, so as to control airflow through the check valve.

A method and apparatus for automatically controlling partial pressure of oxygen in the breathing loop of a rebreather diving system. A diver may adjustably select a control parameter to maintain partial pressure of oxygen at a setpoint that varies with ambient pressure and is within a range between a maximum safe partial pressure of oxygen at depth and a minimum safe partial pressure of oxygen for the purpose of biasing the performance of the rebreather either towards minimizing gas venting from the rebreather breathing loop or minimizing decompression time. A method and apparatus for managing and monitoring the use of dive resources in comparison with a target dive time specified by the diver, calculating and indicating remaining dive time based on dive resource values and calculating and indicating dive resource values required to meet preselected dive resource end values and dive requirements.

A cardiorespiratory fitness optimizer apparatus includes a mouthpiece and a valve assembly. The mouthpiece includes lower and upper tooth beds and an anterior manifold. The manifold terminates anteriorly at a centralized valve assembly interface and includes at least one air-letting aperture. The valve assembly is matable with the centralized valve assembly interface and includes an adjustable aperture. The user is able to adjust the aperture for increasing and decreasing airflow resistance therethrough for optimizing cardiorespiratory fitness. The cardiorespiratory fitness optimizer apparatus may include at least one sensor for sensing airflow activity within the valve assembly and communicating data relating to the airflow activity to an external device for displaying human readable output relating to the airflow activity upon the external device. The valve assembly is removable from the mouthpiece and replaceable with a plug element for maintaining anterior formations of the mouthpiece when the valve assembly is removed.

A cardiorespiratory fitness optimizer apparatus includes a mouthpiece and a valve assembly. The mouthpiece includes lower and upper tooth beds and an anterior manifold. The manifold terminates anteriorly at a centralized valve assembly interface and includes at least one air-letting aperture. The valve assembly is matable with the centralized valve assembly interface and includes an adjustable aperture. The user is able to adjust the aperture for increasing and decreasing airflow resistance therethrough for optimizing cardiorespiratory fitness. The cardiorespiratory fitness optimizer apparatus may include at least one sensor for sensing airflow activity within the valve assembly and communicating data relating to the airflow activity to an external device for displaying human readable output relating to the airflow activity upon the external device. The valve assembly is removable from the mouthpiece and replaceable with a plug element for maintaining anterior formations of the mouthpiece when the valve assembly is removed.

A nozzle apparatus for dispensing an adjustable combination of gas, having a nozzle outlet adjustably combined with a delivery component. The nozzle outlet may have a groove for receiving a roll pin; and an inner lumen comprising a cylindrical shaft having a diameter between 5/1000ths and 20/1000ths of an inch. The delivery component configured to receive air from the nozzle outlet, may have a first circular ambient air hole having a diameter, and a second circular ambient air hole having the same diameter as the first ambient air hole, and a removable plugging device covering the second circular ambient air hole. The delivery component may be adjustable in orientation with respect to the nozzle outlet, and may be adjustable to vary a concentration of therapeutic gas delivered to a patient.

An apparatus for controlling a level of oxygen in a closed environment from an oxygen supply having an oxygen sensor for detecting the level of oxygen in the closed environment. The apparatus has a plurality of relays in communication with the sensor. The apparatus has a valve in communication with the relays and the oxygen supply which is automatically opened with the relays without human interaction, monitoring and adjustment to release oxygen from the oxygen supply into the environment when the level of oxygen in the environment goes below a first predetermined level and which is automatically closed with the relays without human interaction, monitoring and adjustment to stop oxygen from being released from the oxygen supply into the environment when the level of oxygen in the environment goes above a second predetermined level. A method for controlling a level of oxygen in a closed environment from an oxygen supply. A refuge chamber.

A breathing regulator including a first stage regulator, a second stage regulator, a dilution valve, a mixing chamber, and a controller is provided. The first stage regulator is in fluid communication with pressurized source gas. The second stage regulator is in fluid communication with the first stage regulator. The dilution valve is in fluid communication with an ambient gas and includes a size-variable restriction. The mixing chamber is in fluid communication with the second stage regulator, the dilution valve, and a breathing cavity. The controller is in electrical communication with the dilution valve, the second stage regulator, and a plurality of sensors. The controller is configured to: determine a mass flow of the source gas; determine mass flow of the ambient gas; and vary the size-variable restriction of the dilution valve based on the mass flow of the source and/or the mass flow of the ambient gas.

An anti-germ breathing device is provided for a user, the device including a heating element housing an electric conduit; a one-way valve in communication with the heating element, the one-way valve having a first air filter and being structured and disposed for permitting entry of air from the atmosphere into the heating element when the user inhales through an inhale tube; a suction electric switch structured and disposed for connecting a battery with the electric conduit for heating the electric conduit when the user inhales; a cooling element housing a plurality of bulkheads; an air tube in fluid flow communication with each of the heating element and the cooling element; the plurality of bulkheads being sized and configured for evenly distributing air so that the air cools before it is inhaled by the user; and the inhale tube being in fluid flow communication with the cooling element such that the user inhales cooled

An anti-germ breathing device is provided for a user, the device including a heating element housing an electric conduit; a one-way valve in communication with the heating element, the one-way valve having a first air filter and being structured and disposed for permitting entry of air from the atmosphere into the heating element when the user inhales through an inhale tube; a suction electric switch structured and disposed for connecting a battery with the electric conduit for heating the electric conduit when the user inhales; a cooling element housing a plurality of bulkheads; an air tube in fluid flow communication with each of the heating element and the cooling element; the plurality of bulkheads being sized and configured for evenly distributing air so that the air cools before it is inhaled by the user; and the inhale tube being in fluid flow communication with the cooling element such that the user inhales cooled

A breathing apparatus includes a source of compressed air and a lung demand valve that receives compressed air from the source. A pneumatic valve assembly is connected between the source and the lung demand valve. The pneumatic valve assembly is moveable between a first closed position that prevents a flow of compressed air to the lung demand valve and a second open position that provides a path for compressed air to flow to the lung demand valve. A mask receives the lung demand valve therein. The mask provides the compressed air to a user and having a first operational mode providing filtered ambient air to the user and a second operational mode providing compressed air to the user. A control device is coupled to the pneumatic valve assembly. The control device detects a condition in the air surrounding the apparatus and controlling the pneumatic valve assembly to move between the first closed and second open position and the mask to operate in a respective one of the first and second operational modes.