Nasal cannulas for providing respiratory therapy to patients can have a body, two prongs extending from the body, and a gases inlet on one side of the body. There can be a throttle or internal localized reduction in the cross-sectional area of a cavity defined by the internal walls of the cannula body in between the prongs. In at least some arrangements, the throttle can partially or substantially fully equalize flow between the prongs of the cannula.

A gas valve is adapted for controlling the flow of a medical gas for oxygen therapy in case of spontaneous breathing. The gas valve comprises a connection component for connecting the gas valve to an external supply; and a regulating system configured for selecting and supplying a pulsating flow of medical gas or a continuous flow of medical gas, in which the regulating system comprises a first sub-regulating system for supplying a pulsating flow and a second sub-regulating system for supplying a continuous flow.

A portable oxygen concentrator designed for medical use where the sieve beds, adsorbers, are designed to be replaced by a patient. The concentrator is designed so that the beds are at least partially exposed to the outside of the system and can be easily released by a simple user-friendly mechanism. Replacement beds may be installed easily by patients, and all gas seals will function properly after installation.

A portable oxygen concentrator designed for medical use where the sieve beds, adsorbers, are designed to be replaced by a patient. The concentrator is designed so that the beds are at least partially exposed to the outside of the system and can be easily released by a simple user-friendly mechanism. Replacement beds may be installed easily by patients, and all gas seals will function properly after installation.

A gas delivery conduit adapted for fluidly connecting to a respiratory gases delivery system in a high flow therapy system. In one embodiment, a nasal cannula includes a base portion defining a first therapeutic gas passageway, a nozzle disposed adjacent said base portion and defining a second therapeutic gas passageway, the first passageway being in gaseous communication with the second passageway and a conduit configured to facilitate sensing that has an inlet side that is independent of and axially spaced apart from an outlet side of the nozzle. The conduit inlet side can extend beyond the nozzle outlet side of the nasal cannula. Additionally, the nasal cannula has a feature adapted to prevent one of the conduit and the nozzle from creating a seal with a user's nare and a feature adapted to prevent one of the conduit and the nozzle from creating a seal with a user's nare.

An oxygen delivery method for delivering oxygen stored in an oxygen tank to a recipient according to an embodiment of the present invention includes: receiving a prescription flow that is an oxygen delivery flow prescribed to the recipient; receiving a saving ratio, the saving ratio being input by the recipient and being a ratio of a prescription flow and an average delivery flow; selecting an oxygen delivery mode among a plurality of preset oxygen delivery modes based on the saving ratio; detecting a breathing pressure of the recipient; and controlling an oxygen delivery flow to the recipient based on the prescription flow, the saving ratio and detected breathing pressure.

A respiratory therapy system configured to deliver gases to a patient can have a non-sealed gas flow generating arrangement configured to deliver a high flow of positive gas to an airway of a patient and a negative flow of gas away from an airway of the patient. The positive and negative flows of gas can be generated simultaneously. The flow of positive and negative gases reduces exhaled gases in anatomical dead spaces of the patient.

A non-invasive ventilation system may include at least one outer tube with a proximal lateral end of the outer tube adapted to extend to a side of a nose. The at least one outer tube may also include a throat section. At least one coupler may be located at a distal section of the outer tube for impinging at least one nostril and positioning the at least one outer tube relative to the at least one nostril. At least one jet nozzle may be positioned within the outer tube at the proximal lateral end and in fluid communication with a pressurized gas supply. At least one opening in the distal section may be adapted to be in fluid communication with the nostril. At least one aperture in the at least one outer tube may be in fluid communication with ambient air. The at least one aperture may be in proximity to the at least one jet nozzle.

Nasal cannulas for providing respiratory therapy to patients can have a body, two prongs extending from the body, and a gases inlet on one side of the body. There can be a throttle or internal localized reduction in the cross-sectional area of a cavity defined by the internal walls of the cannula body in between the prongs. In at least some arrangements, the throttle can partially or substantially fully equalize flow between the prongs of the cannula.

A non-invasive ventilation system may include a nasal interface. The nasal interface may include a left outer tube with a left distal end adapted to impinge a left nostril, at least one left opening in the left distal end in pneumatic communication with the left nostril, and a left proximal end of the left outer tube in fluid communication with ambient air. The left proximal end of the left outer tube may curve laterally away from a midline of a face. A right outer tube may be similarly provided. One or more left jet nozzles may direct ventilation gas into the left outer tube, and one or more right jet nozzles may direct ventilation gas into the right outer tube. The jet nozzles may be in fluid communication with the pressurized gas supply.