An ear mounted cannular nasal breathing filter provides an air mixing chamber to offset the effects of dry air caused by filtration by allowing for an admixture of filtered and pre-conditioned (humidified and heated) air. The air chamber features an internal or centered mixing chamber disposed below a one-way exhaust valve and above a filtering system. The air mixing chamber retains a predefined volume or percentage of exhausted breath that is mixed with a predefined volume or percentage of filtered air, with the filtered air originating as ambient air. An air chamber assembly is retained and supported upon a user by an ear mount system comprising a) a flexible wire that conforms to the ear join, or b) an upper arm in telescopic connection with a lower arm, with the two arms in dynamic tension by use of an internal elastic member, providing a tensioned fit to the ear join.

A resuscitation bag system (1) useable for resuscitating a person in cardiac arrest, and having a gas control unit (90) with a first valve (92) fluidly connected to a first (922) and to a second conduit (923), the first (922) and second conduits (923) being arranged in parallel and further fluidly connected to the first conduit element (56), the first conduit (922) having a first flow restriction (924) configured for limiting the gas flow to a first flowrate, and the second conduit (923) comprising second flow restriction (925) configured for limiting the gas flow to a second flowrate, with the second flowrate being less than the first flowrate.

The invention relates to a flow indicator preferably to be used in oxygen therapy treatment of patients where a clear flow or no flow state must be signaled for the supply of oxygen.

According to the inventive flow indicator are two cylindrical bodies used, one (30) movable and one (10) stationary, and with one extended flow restriction passage (80) that forces the movable cylindrical body away from a sight glass (40), instead exposing the stationary cylindrical body. The viewable cylindrical part of the movable part may be colored red (R), and the viewable cylindrical part of the stationary body may be colored green (G).

A flow indicator with quick and stable indication of developed flow is obtained.

A system that determines one or more sleep phenotyping parameters of a subject. In one embodiment, the system comprises a sleep sensor, a stimulus generator, and a processor. The sleep sensor generates signals that convey information related to the physiological functions that indicate the sleep stage of the subject. The stimulus generator provides a stimulus to the subject that enables information related to the sleep phenotyping parameters to be determined. The processor receives the signals generated by the sleep sensor and is in operative communication with the stimulus generator. The processor (i) determines, based on the signals received from the sleep sensor, whether a trigger condition related to the current sleep stage of the subject is satisfied, (ii) controls the stimulus generator to provide the stimulus to the subject if the trigger condition is satisfied, and (iii) quantifies the response of the subject to the stimulus.

A breathing circuit for use in conjunction with a ventilator serving a mechanically-ventilated patient includes an expiratory gas airflow pathway; an inspiratory gas airflow pathway; and a gas mixing mechanism operable to mix inspiratory gas and expiratory gas in an amount sufficient to equilibrate the patient's PETCO.sub.2 and arterial PCO.sub.2 such that the patient's PETCO.sub.2 is a clinically reliable approximation of the patient's PaCO.sub.2.

Gas flow control valves comprising a valve housing including a cylindrical interior passage, and a housing opening extending from the interior passage through the housing. The gas flow control valve further comprises a cylindrical rotary valve element including a sidewall, and a rotary valve element opening extending through the sidewall. The valve element is rotatably received within the interior passage of the valve housing, such that the housing opening may be selectively aligned with the rotary valve element opening, and an area of overlap of the housing opening and the valve element opening may be varied by rotating the valve element within the interior passage of the valve housing.

An apparatus for supplying breathing air to a person includes a rebreathing system arranged in the air supply circuit, which removes CO.sub.2 at least in part present in the person's expiration air with a CO.sub.2 absorber, and treats the expiration air to supply treated air to the person again as inhalation air. The apparatus includes a condensate collection container (9) collecting water forming in the air supply circuit. The condensate collection container (9) is arranged at least in part below a reaction zone (17) of the CO.sub.2 absorber (1). At least one heat exchanger (10, 14) is provided in the CO.sub.2 absorber, via which heat from the air, which flows through the CO.sub.2 absorber and is heated as a result of the exothermic CO.sub.2 absorption reaction occurring in the reaction zone of the CO.sub.2 absorber, is dissipated.

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 gas distributor for a rebreather, the gas distributor being configured for connection with an inhale hose and with an exhale hose with a mouthpiece in between, wherein the gas distributor comprises a gas distributor housing, an inhale chamber at the gas distributor housing and comprising a first inhale port for connection with an inhale counterlung or with a scrubber, a second inhale port for connection with the inhale hose, and a gas supply valve for supplying gas on demand, an exhale chamber at the gas distributor housing and comprising a first exhale port for connection with an exhale counterlung or with a scrubber, a second exhale port for connection with the exhale hose, and an overpressure valve for opening in an event of overpressure, and a switch arranged at the gas distributor housing and configured for being switchable between an open circuit mode and a closed circuit mode.

An altitude simulator controls a percentage of oxygen within an enclosed environment to simulate altitude. A controller of the altitude simulator determines a set altitude to be simulated within the enclosed environment and determines an oxygen percentage setpoint based upon the set altitude. The altitude simulator senses, at intervals, environmental parameters of the enclosed environment. The altitude simulator may determine, from the environmental parameters, an oxygen percentage value indicative of a percentage of oxygen in air of the enclosed environment. The altitude simulator feeds hypoxic air into the enclosed environment from an air unit and controls a ventilation fan to maintain the oxygen percentage value at the oxygen percentage setpoint.