Proportional assist ventilation using a disturbance observer and predictive control

This paper presents a general control representation for medically-proposed methods of mechanical ventilation, and then proposes an improved configuration with a disturbance observer and with a predictive control block against an existing proportional assist ventilation (PAV) method. The trade-off relation between robust stability margin and responsibility has been shown using parSpar_infin ^{- 1} in Nyquist diagrams and time-response results with our mechanical ventilator SSV-200 connected to our lung simulator (LUNGOO). Also, a clinical issue of expiratory asynchrony is compared between two methods with the same test construction. The actual clinical tests for these performances will be expected with a next new version of our SSV. We also present on-line identification methods for patient´s airway resistance and respiratory compliance which are necessary for implementation of PAV. Animal test results and a few clinical test results of our techniques are also reported for these identification methods