Patent ID: 7841343

Claim:
A system for delivering therapeutic breathing gas to a patient, comprising: a gas source; a conserver between the gas source and the patient; a sensor for detecting patient breath events and measuring the parameters of the breath events, said parameters including breath pressure level; processor and control elements for acquiring signals from the sensor and controlling the delivery of gas to the patient, wherein the system supports at least one mode of operation such that a threshold breath pressure level detected by the sensor, which causes the processor and control elements to deliver a volume of gas to the patient, may be user selectable such that the volume of gas is delivered to the patient when the patient's threshold breath pressure level is at the level selected by the user; and wherein the system provides a plurality of user selectable threshold pressure levels, said threshold pressure levels comprising a lower level adapted to trigger delivery of gas to the user when the user is asleep or in a state of inactivity such that the user's breath is shallower than normal.