A humidification control system comprises a ventilation therapy apparatus main body, a respiratory humidifier, a heating pipeline and a nasal oxygen cannula, wherein the ventilation therapy apparatus main body comprises a fan and a first controller, the respiratory humidifier comprises a water tank, a heating plate, a water tank air inlet temperature sensor and a heating plate temperature sensor, an air outlet of the fan is connected to an air inlet of the water tank; an air outlet of the water tank is connected to an air inlet of the heating pipeline; an air outlet of the water tank is connected to an input port of the nasal oxygen cannula; the heating pipeline comprises a heating pipeline air inlet temperature sensor and a heating pipeline heating control module; and the first controller makes the relative humidity of the current first mixed airflow.

The present invention provides a breathing assistance apparatus that has a convenient and effective method of cleaning internal conduits inside the apparatus. The breathing assistance apparatus is preferably a gases supply and humidification device. The cleaning method is a method of disinfection that is automated so minimal training is required to disinfect in particular an internal elbow conduit within the device. It is therefore not necessary to dismantle the gases supply and humidification device, therefore, inadvertent damage to the internal parts of the device is avoided. The present invention also provides a method of disinfecting a heated breathing conduit and a patient interface.

Devices for delivering a controlled concentration of an agent are provided. The device includes a reservoir for the agent and a flow control portion operably connected to the reservoir. The device also includes a valve for releasing the agent from the flow control portion and a pump for flowing air to mix with the agent released by the valve and for flowing the agent and air mixture out of the device. Methods of delivering a vaporized agent to a subject are also provided. The methods include storing a liquid agent in a reservoir of a device and flowing the agent into a flow control chamber to change the agent to a gas. The methods also include mixing the agent in gas form with air and flowing the agent and air mixture out of the device to be delivered to a subject.

A patient interface is configured to deliver a flow of positive pressure respiratory gas to an entrance of a patients airways. The patient interface includes an elastomeric support wall forming at least part of a plenum chamber configured to receive the flow of positive pressure respiratory gas. The patient interface also includes an elastomeric support flange positioned at an end of the elastomeric support wall and extending radially inward from the support wall. The support flange has a flap portion at a central superior region of the support flange that extends further in the radially inward direction than the rest of the support flange. In addition, a foam cushion is mounted on the support flange. The foam cushion is configured to form a seal with the patients face and includes an attachment surface that is in contact with an outer surface of the support flange.

A patient interface for supplying a flow of breathable gas to the airways of a patient may comprise a heat and moisture exchanger (HME). The HME may be positioned in a flow path of the flow of breathable gas. The HME may absorb heat and moisture from gas exhaled by the patient and the incoming flow of breathable gas to be supplied to the patient's airways may be heated and moisturized by the heat and moisture held in the HME.

A CPAP system for supplying humidified gases to a user is disclosed in which various interfaces are described for gas delivery. A mask cushion including a deformable cushion and thin sheath is described.

The present disclosure discloses a humidification device, a humidifier and a ventilator, overcoming the deficiency that when the structure of a water tank of a current ventilator causes the water tank to tilt or sway, it is easy for a large amount of water to enter a heating portion. The humidification device comprises a heating portion and a liquid inlet structure adding liquid to the heating portion. The heating portion comprises an accommodating chamber and a transition chamber limiting the amount of liquid in the accommodating chamber, and the liquid inlet structure is communicated with the transition chamber and allows the liquid to enter the transition chamber. According to embodiments of the present disclosure, a large amount of stored water may be prevented from entering the heating portion and thus affecting the heating efficiency when a water tank or a similar humidification device tilts.

A humidifier for a respiratory apparatus for delivering a humidified flow of breathable gas to a patient includes a humidifier chamber configured to store a supply of water to humidify the flow of breathable gas. The humidifier chamber includes a first heating element configured to heat the supply of water. The humidifier also includes a relative humidity sensor to detect a relative humidity of ambient air and generate signals indicative of the ambient relative humidity; a first temperature sensor to detect a temperature of ambient air and generate signals indicative of the ambient temperature; and a controller configured to determine an absolute humidity of the ambient air from the signals generated by the relative humidity sensor and the first temperature sensor and to control the first heating element to provide a predetermined relative humidity to the flow of breathable gas. A method of humidifying a flow of breathable gas to be provided to a patient includes determining an absolute humidity of ambient air used to form the flow of breathable gas; and controlling a temperature of a supply of water that humidifies the flow of breathable gas to provide a predetermined absolute humidity corresponding to a predetermined temperature and a predetermined relative humidity of the flow to be delivered to the patient.

A respiratory assistance system can provide high flow therapy to patients. The respiratory assistance system can include a patient interface that can deliver a gas flow to a patient and a gas source that can drive the gas flow towards the patient interface at an operating flow rate. The system can include a controller for controlling the operating flow rate of the gas. The controller can apply multiple test flow rate values in a range as the operating flow rate. For each of the test flow rate values, the controller can measure a patient parameter. The controller can determine a new flow rate value based on the measured patient parameters. Patient parameters can include respiration rate, work of breathing, or any other parameters related to the respiratory circuit.

A cushion assembly for a patient interface includes an elastomeric seal-forming portion with a dome-shaped superior region that is intersected by the sagittal plane in the vicinity of a superior tangent point. The seal-forming portion further including a saddle-shaped inferior region that is intersected by the sagittal plane and includes an inferior tangent point. A first support region is located on one side of the sagittal plane between the inferior region and the superior region, the exterior surface of the elastomeric seal forming portion at the first support region being cylinder-shaped and/or saddle-shaped. In addition, a blowout prevention system is configured to counter a force acting on the unsupported edge of the elastomeric seal-forming portion due to a pressure within the chamber, the blowout prevention system being attached to the elastomeric seal-forming portion at the first support region of the elastomeric seal-forming portion.