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Automatic Control System For Mechanical Ventilation For Active Or Passive Subjects

  • US 20110017214A1
  • Filed: 07/25/2009
  • Published: 01/27/2011
  • Est. Priority Date: 07/25/2009
  • Status: Active Grant
First Claim
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1. A method for automatically controlling a ventilator, comprising:

  • (a) determining ongoing volume and flow rate of gas to a patient during inspiration;

    (b) providing respiratory elastance, K, and airway resistance, K′

    , of the patient;

    (c) generating control signals controlling pressure applied by the ventilator as a sum of elastic and resistive components of pressure, the elastic component of pressure having a proportionality factor, K1, proportional to the determined volume of the inspiratory gas, and the resistive component of pressure having a proportionality factor, K2, proportional to the determined flow rate of the inspiratory gas; and

    (d) automatically adjusting a support level for elastic component of pressure, α

    =K1/K, a support level for resistive component of pressure, α



    =K2/K′

    , and the proportionality factors K1 and K2, based on a comparison between a work of breathing for the patient determined by the ventilator and a previously determined work of breathing.

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