An apparatus such as a fluid mixer, suitable for use with a respirator, including a venturi nozzle for flow of a pressure-controlled fluid; an ambient fluid aperture in fluid communication with the venturi nozzle; a fluid port; a pressure force multiplier in fluid communication with the fluid port; and a valve moveable relative to the venturi nozzle between a start flow position and a stop flow position; where the pressure force multiplier is configured such that fluid forced into the fluid port actuates the valve relative to the venturi nozzle; and where the pressure force multiplier is configured such that fluid withdrawn from the fluid port actuates the valve relative to the venturi nozzle. A method of using an apparatus suitable for a ventilator is also disclosed.

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.

An expiratory limb is provided that is configured to remove humidified gases from a patient and configured to provide improved drying performance by providing a tailored temperature profile along the limb. Limbs for providing humidified gases to and/or removing humidified gases from a patient are also provided, the limbs having improved gas residence time at constant volumetric flow rate. The improved residence time can be achieved by providing a limb comprising multiple lumens.

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 respiratory assistance device including a respiratory interface device configured to be worn by a user and deliver a gas, a gas temperature measurement unit configured to measure a gas temperature that is a temperature of the gas, a warming unit configured to warm the gas, and a temperature change unit configured to change the gas temperature by controlling the warming unit. The respiratory assistance device can administer comfortable respiratory assistance even during sleep.

This invention relates to a breath indicator that is receivable by a part of a breathing assistance apparatus that supplies gas to a patient. The indicator comprises an elongate body having a gas sampling end and an attachment end. The attachment end is adapted to attach to a part of a breathing assistance apparatus and for locating the gas sampling end. The gas sampling end is to be located in a region where gas from the patient is to be exhaled. The gas sampling end being in communication with a sensor comprising a detector material changeable between a first visual indicator state relating to an inhalation phase of the patient, and a second visual indicator state relating to an exhalation phase of the patient. The detector material is capable of changing between the visual indicator states at a sufficient rate to substantially correspond with the inhalation and exhalation phases of the patient.

For the production of an assembly for a patient ventilation system, at least one conducting connection is first prepared between contact pins of a component receptacle of a connector for the insertion of at least one electronic component and sheath wires which are guided along a tube sheath of a breathing air tube portion of the assembly. This prepared conducting connection is overmolded to form an inner conduction carrier housing sleeve of the connector. The conducting connection is connected to the sheath wires and the inner conduction carrier housing sleeve is overmolded to form an outer connector housing of the connector in which the component receptacle is implemented. This results in an assembly manufacturing process that is suitable for mass production.

An assembly for a patient ventilation system has a respiratory air hose section for guiding ventilation air from a ventilation source to a patient. A connector, connected to the respiratory air hose section, is used to connect the respiratory air hose section to a further component of the patient ventilation system guiding ventilation air. An air guiding connector component of the connector forms an integral component with the respiratory air hose section. The connector has a sensor receptacle for inserting a temperature sensor into the air guiding connector component. The temperature sensor is used to measure a temperature of the ventilation air. A temperature sensor device to be plugged into the sensor receptacle of the assembly has a support body, the temperature sensor protruding beyond the support body, and a handle section to grasp a section of the support body facing away from the temperature sensor.

Some embodiments provide a breathing assistance apparatus comprising a conduit for conveying gases therein, the conduit comprising circuitry. The circuitry may comprise at least one heater wire part to heat gases in the conduit, in use, and at least one sensor wire part comprising at least one sensor for monitoring a parameter of the gases in the conduit. There is also provided a controller to control provision of AC power or AC voltage to the heater wire part; and control selective reading of the sensor. The controller may be configured to read the sensor at or about a particular portion of the AC power waveform provided to the heater wire part.

A medical tube transports gases to and/or from a patient. The medical tube includes a bead wrapped around a longitudinal axis of the medical tube. The bead forms a first portion of a lumen wall of the medical tube. The medical tube also includes a film wrapped around the longitudinal axis of the medical tube. A first portion of the film overlies the bead, and a second portion of the film forms a second portion of the lumen wall. The lumen wall, formed by the bead and the second portion of the film forms a substantially smooth bore. The medical tube can be reusable or reprocessable.