Resmed Limited

Resmed Pty Ltd

Jack Wei Cheng

Ronald James Huby

Alexander Virr

Paul Jan Klasek

Nathan John Row

Zhuo Ran Tang

Christopher Kingsley Blunsden

Graham Stephen Cutcliffe

A respiratory apparatus is configured to deliver breathable gas to a patient's airways and includes a flow generator configured to pressurize the breathable gas and a humidifier configured to vaporize water and deliver water vapor to humidify the breathable gas. The respiratory apparatus further includes a gas flow path leading from the flow generator to the humidifier and from the humidifier to a patient interface. A continuous heater is positioned within the gas flow path and includes multiple separately controllable heating zones.

Humidifier for respiratory apparatus

A heated conduit is configured to be connected to and receive pressurized breathable gas from a respiratory unit. The heated conduit includes a first cuff configured to be attached to the respiratory unit, the first cuff comprising a tubular air inlet portion that is configured to receive the pressurized breathable gas and an electrical connector portion that is adjacent to the tubular air inlet portion and comprises three electrical terminals. The three electrical terminals are configured to engage an electrical connector of the respiratory unit. A grouping of wires are supported within a helical rib of a flexible tube portion. The grouping of wires includes a pair of heating wires configured to generate heat and a signal wire configured to carry the signal that is output by a sensing device. Each of the heating wires and the signal wire is connected to a corresponding one of the three electrical terminals of the electrical connector portion of the first cuff.

An over-pressure control device prevents over-pressure conditions during the delivery of pressure treatment therapy to a patient with a respiratory treatment apparatus. The device may prevent delivered pressure from exceeding a first maximum pressure threshold. The device may also prevent the delivered pressure from exceeding a second maximum pressure threshold when the delivered pressure exceeds another pressure threshold for a period of time. In some embodiments, the second maximum pressure threshold may be lower than the first maximum pressure threshold. In an example embodiment, a set of comparators are configured to compare pressure with a maximum pressure threshold and to control a reduction in the pressure if the pressure exceeds the maximum pressure threshold. The set may also be configured to compare the pressure with a pressure threshold and to control reduction in the maximum pressure threshold if the pressure exceeds the pressure threshold for a period of time.

Pressure control in respiratory treatment apparatus

A respiratory apparatus for delivering breathable gas to a patient includes a flow generator that generates a supply of pressurized gas to be delivered to the patient; a humidifier for vaporizing water and delivering water vapor to humidify the gas; a gas flow path leading from the flow generator to the humidifier and from the humidifier to a patient interface; and a heater in thermal contact with the gas and/or the water, wherein the heater includes an elongate heating filament in the form of a tape. A humidifier for respiratory apparatus includes a first respiratory gas passage for receiving gas from a flow generator, a humidifier chamber, a second respiratory gas passage for delivering humidified gas to a patient interface, and a heater in thermal contact with the gas and/or the water, wherein the heater includes an elongate heating filament extending along at least part of both said first and second respiratory gas passages. A conduit for use in a respiratory apparatus for delivering breathable gas to a patient includes a tube; a helical rib on an outer surface of the tube; and a plurality of wires supported by the helical rib in contact with the outer surface of the tube.

A flexible tape heater () in a patient conduit () may be used to heat the flow of gas in the patient conduit () that is delivered to the patient mask (). The thin, flat and extended nature of the flexible tape heater () may enhance heat transfer with the gas flow while also providing low impedance to the gas flow. Heating of the gas may facilitate the desired temperature and humidity to be reached for the gas delivered to the patient by the respiratory apparatus. The flexible tape heater () may be placed in the patient conduit () such that the flexible tape heater () is twisted or bent about one or more of the flexible tape heater's () three axes. Additionally these configurations may be used to enhance the turbulent mixing of the water vapor produced in the humidification chamber () with the gas flow.

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Marrickville, Australia

Jack Wei Cheng