Patent ID: 6135967
Filing Date: 2000-10-24
Classification: A61M

Abstract:
A respiratory ventilator for monitoring breath flow and automatically regulating and calibrating respiration gas flow delivery in accord with such monitored breath flow, the ventilator comprising:a) a respiratory gas delivery member having a calibrateable gas flow adjuster and a calibrateable gas pressure adjuster, wherein said flow and pressure adjusters regulate delivery of respiratory gas; andb) a gas flow calibration member in communication with the gas flow adjuster and gas pressure adjuster for calibrating said adjusters to thereby regulate delivery of respiratory gas, said gas flow calibration member comprising:1) a reader component for recording inspiratory gas volume, exhalation gas volume, and exhalation time of an individual breath, and for measuring a plurality of incremental exhalation gas flow values in a plurality of incremental time periods during exhalation of said individual breath and averaging as a set of consecutive flow values a pre-selected number of said flow values;2) a composite calculator component for determining an average composite flow value of a plurality of consecutive sets of flow values and thereafter determining and saving an average aggregate flow value of a plurality of consecutive composite flow values, and additionally for determining a volume flow calibration value as the difference between inspired and exhaled gas volume divided by exhalation time; and3) a scanner calculator component for scanning in reverse order the plurality of consecutive composite flow values and calculating a new flow calibration value where a pre-selected number of consecutive composite flow values fall within a pre-selected flow rate, and thereafter for calibration of the gas flow adjuster and gas pressure adjuster.