| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for controlling the humidity level and flow rate of gasses in a device which delivers a stream flow of heated, humidified gases to a user for therapy purposes.SOLUTION: A breathing assistance system 1 for delivering a stream flow of heated, humidified gases to a user, includes a humidifier unit 21 which holds and heats a predetermined volume of water 20, and which in use receives a flow of gases from a gases source via an inlet port 23. The flow of gases passes through the humidifier and exits via an exit port. The system further includes: a temperature sensor which measures the temperature of the gases exiting the humidifier unit; an ambient temperature sensor 60 which measures the temperature of gases before they enter the humidifier unit; and a flow sensor which measures the flow rate of the gases stream. The system also includes a controller 8b which receives data from the temperature and flow sensors, and which determines a control output in response. The control output is configured to adjust the power to the humidifier unit to achieve a desired output at the humidifier unit exit port. |
