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MINIMIZING IMPOSED EXPIRATORY RESISTANCE OF MECHANICAL VENTILATOR BY OPTIMIZING EXHALATION VALVE CONTROL

  • US 20130284177A1
  • Filed: 04/30/2012
  • Published: 10/31/2013
  • Est. Priority Date: 04/30/2012
  • Status: Active Grant
First Claim
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1. A method for controlling exhalation during ventilation of a patient on a ventilator, the method comprising:

  • determining a control command for an exhalation valve, wherein the control command targets a pressure at the exhalation valve between a minimum pressure and a steady-state pressure for a period of time;

    controlling the exhalation valve based on the control command during one or more exhalation cycles;

    monitoring an end exhalation pressure and a flow undershoot during the one or more exhalation cycles;

    comparing the end exhalation pressure to a predetermined pressure range;

    comparing the flow undershoot to a predetermined flow threshold; and

    based on the comparing, updating the control command in order to maintain a positive-end expiratory pressure (PEEP) at the end of the one or more exhalation cycles.

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