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1 Biocybernetics and Biomedical Engineering

1 2005

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Identification of mechanical parameters of respiratory system during ventilatory support of lungs

Pałko K. J., Kozarski M., Darowski M.

Biocybernetics and Biomedical Engineering

2005

Vol. 25, no. 1

73-81

Identification of mechanical parameters of lungs by using a pressure method with an added compliance is presented in this paper. This method is based on periodically connecting an additional external mechanical compliance to the respirator-lungs circuit, to determine the values of the mechanical parameters of the respiratory system from measurements of the pressure in specific phases of the respiratory cycle. The expiratory flow was measured to estimate the time constant and the respiratory resistance. The identification of the parameters of lungs is connected with the dynamic signal analysis of the pressure courses registered in a very short time (< 200 ms) at the beginning of the expiratory phase, when the respiratory muscles are non-active. The measurement system is driven by the computer, which is also used to analyse the signals received from the lung model. The results confirm that the measurement time of 200 ms is sufficient to determine the lung compliance.