The invention relates to a pressure relief valve comprising a respiratory system muffler located along a gas flow path of the pressure relief valve. The muffler comprises a tortuous gas flow path to attenuate sound. The invention also relates to a respiratory system muffler comprising a gas flow path extending between an inlet and an outlet of the muffler. The gas flow path has a variable cross-sectional area and comprises one or more expansion portions comprising a first cross-sectional area and one or more contraction portions comprising a second cross-sectional area. The first cross-sectional area is generally larger than the second cross-sectional area. The variable cross-sectional areas of the gas flow path help to attenuate sound.

A percussive ventilation breathing head is adapted to be supplied with a flow of pulsatile gas fed to an elongated breathing head body at a proximal end thereof. The breathing head body defines an interior passageway therein. A reciprocating injector shuttle is movably mounted in the breathing head passageway. The shuttle moves distally due to the pulsatile gas, assisted by a diaphragm and a venturi-like jet nozzle which nozzle pulls nebulized aerosol from a depending plenum and a nebulizer attached below the depending plenum. A depending body defines the plenum. The generally cylindrical nebulizer is attached below the depending body. The shuttle is also biased in a proximal direction within the interior passageway and moves proximally due to the bias. The shuttle defines an internal flow passage from a proximal shuttle input port to a distal shuttle output port at the distalmost mouth of the percussive ventilation breathing head body.

The disclosed invention provides a breathing circuit that includes a volume regulator that includes only three ports which include an inlet port connected to the exhalation port, a first outlet port connected to atmosphere, and a second outlet port connected to the moisturizer assembly. The breathing circuit is used for a ventilation system that delivers breaths to a patient. The inlet port of the volume regulator includes a flapper valve that moves only inward at an open position to receive the exhaled gas from the patient. The first outlet port includes a flapper valve that moves outward at an open position to exhaust gas in the volume regulator into the atmosphere. The second outlet port includes a flapper valve that moves only outward at an open position to exhaust gas in the volume regulator into the moisturizer assembly.

A high flow therapy system for delivering heated and humidified respiratory gas to an airway of a patient, the system including a respiratory gas flow pathway for delivering the respiratory gas to the airway of the patient by way of a non-sealing respiratory interface; wherein flow rate of the pressurized respiratory gas is controlled by a microprocessor.

An example aerosol delivery device includes a mouthpiece having an airflow outlet, and an airflow passage extending between an airflow inlet and the airflow outlet. The example aerosol delivery device further includes a housing configured to receive a cartridge that includes an aerosolizable substance and a vapor element configured to heat the aerosolizable substance, and an internal power source configured to provide electrical power. The example aerosol delivery device further includes a controller coupled to the internal power source to receive a portion of the electrical power and configured to, when the cartridge is installed at the housing, cause the vapor element of the cartridge to heat the aerosolizable substance to release an aerosol into the airflow passage during an inhalation through the airflow outlet, and a connector configured to receive power from an external source to recharge the internal power source.

An exercise with oxygen therapy (EWOT) apparatus for rejuvenating oxygen-depleted cell tissue and simulating high altitude oxygen conditions. The EWOT apparatus includes a first cylindrical bladder for providing oxygen-enriched air and a second bladder for providing lower-purity hypoxic air. The first bladder is retained within an open, lightweight rectangular-shaped frame having vertical frame members. An air supply source provides the oxygen-enriched and hypoxic air to the first and second bladders, respectively. A control switch, which can be manually and/or programmed to automatically operate, selectively delivers the oxygen-enriched and/or hypoxic air to a breathing mask worn by a user while exercising on exercise equipment. The first bladder includes a plurality of weights which provide a positive pressure to the air therein. The cylindrical first bladder is attached to the vertical frame members with slidable rings and expands and collapses in a vertical direction when being filled or during use, respectively.

The disclosed invention provides a breathing circuit that includes a volume regulator that includes only three ports which include an inlet port connected to the exhalation port, a first outlet port connected to atmosphere, and a second outlet port connected to the moisturizer assembly. The breathing circuit is used for a ventilation system that delivers breaths to a patient. The inlet port of the volume regulator includes a flapper valve that moves only inward at an open position to receive the exhaled gas from the patient. The first outlet port includes a flapper valve that moves outward at an open position to exhaust gas in the volume regulator into the atmosphere. The second outlet port includes a flapper valve that moves only outward at an open position to exhaust gas in the volume regulator into the moisturizer assembly.

A connector having a connector body with an inlet and an outlet defining a gas flow passage therebetween. The connector body has an overlap portion that is configured to overlap with a portion of a second connector when connected. An access passage extends through the overlap portion to the gas flow passage.

The present disclosure is directed to systems and methods of providing a mixed-gas inhalant to a patient via a gas recirculation loop. The gas recirculation loop receives a first mixed-gas exhalant having a first carbon dioxide concentration from the patient, one or more carbon dioxide removal devices discharge a second mixed-gas exhalant having a second carbon dioxide concentration that is less than the first carbon dioxide concentration. The second mixed-gas exhalant is combined with a mixed-gas supply to provide a mixed-gas inhalant. The mied-gas supply includes a first gas and a second gas. The mixed-gas supply is pressure and flow controlled to produce a mixed-gas inhalant having a defined composition delivered to the patient at a defined volumetric flow rate. The first gas may include a gas containing oxygen and the second gas may include a gas mixture containing a noble or inert gas and oxygen.

A breathing apparatus (1) is disclosed comprising an inspiratory channel (3), an expiratory channel (4), a patient interface (5), an oxygen valve (13) and a blower (7) comprising blower driving means (9). The blower (7) is arranged to produce a flow of air to the inspiratory channel (3). The oxygen valve (13) is configured to selectively deliver a flow of oxygen to the inspiratory channel (3). The breathing apparatus further comprises a control unit (19) configured to control the blower driving means (9) so that the blower (7) produces substantially no flow of air to the inspiratory channel (3) during a time period (tp). The present disclosure further relates to a method (100) of controlling operation of a breathing apparatus (1), a computer program and a computer program product (300) for performing a method (100) of controlling operation of a breathing apparatus (1).