User interface and system for supplying gases to an airway

A system for providing respiratory support to a patient, the system comprising:

• a patient interface adapted to direct a flow of gas to a patient and a gas conduit in communication with the patient interface to deliver the flow of gas to the patient interface;
• and
• at least one processor to control a flow controller for controlling the flow of gas through the gas conduit and the patient interface to the patient, the at least one processor configured to control the flow controller to reduce or prevent the flow of gas to the patient interface when a measured resistance to flow of the system received by the at least one processor increases above a predetermined value,
• wherein the predetermined value varies with a flow rate of the flow of gas.

A system for providing respiratory support to a patient, the system comprising:

• a patient interface adapted to direct a flow of gas to a patient;
• a gas conduit in communication with the patient interface to deliver the flow of gas to the patient interface;
• a pressure sensor for determining a pressure within the system;
• and
• at least one processor to control a flow controller for controlling the flow of gas through the gas conduit and the patient interface to the patient, the at least one processor configured to control the flow controller to:
• provide the flow of gas at a set flow rate;
• and
• reduce the flow of gas below the set flow rate when the pressure determined by the pressure sensor exceeds a predetermined value,
• wherein the predetermined value varies with a flow rate of the flow of gas.