Patent ID: 6553991
Filing Date: 2003-04-29
Classification: A61M,G01F

Abstract:
In a patient ventilation system for determining a dynamically changing output parameter of interest, the patient ventilation system including a temperature sensor for determining the output parameter of interest, the temperature sensor exhibiting a dynamic characteristic having a time constant, resulting in a transient performance of the temperature sensor, said temperature sensor having a known transfer function and generating temperature sensor output signals indicative of the output parameter of interest, and a flow meter for determining flow in the patient ventilation system, the flow meter generating a flow output signal, the improvement in the system comprising:a computing device connected to the temperature sensor for receiving a plurality of said temperature sensor output signals from the temperature sensor at predetermined intervals of time, for processing said plurality of output signals, and for determining an estimate of said output parameter of interest based upon said temperature sensor output signals and said known transfer function, and for determining flow in the patient ventilation system based upon the output parameter of interest and the flow output signal; and means for outputting an indication of the estimate of said output parameter of interest and an indication of flow in the patient ventilation system.