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System and method for supporting sub-physiologic and physiologic tidal volumes in spontaneous or non-spontaneous breathing during high frequency ventilation

  • US 10,058,664 B2
  • Filed: 12/01/2010
  • Issued: 08/28/2018
  • Est. Priority Date: 12/15/2009
  • Status: Active Grant
First Claim
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1. A method of providing high frequency positive pressure ventilation (HFPPV) to a patient, comprising acts of:

  • delivering a flow of breathing gas to the patient, the flow of breathing gas having a first positive pressure level and a second positive pressure level, the first and second positive pressure levels alternating with one another in a plurality of cycles in the flow of breathing gas to have a frequency and an amplitude, the flow of breathing gas to the patient generating a mean airway pressure and having a flow amplitude;

    performing by a controller a determination of spontaneous breathing efforts by the patient, wherein the spontaneous breathing efforts comprise one of a spontaneous breathing, an attempt at spontaneous breathing and non-spontaneous breathing;

    performing by the controller a simultaneous control of;

    an adjustment of the mean airway pressure, a modulation of the frequency and a duty cycle of the flow of breathing gas, and a modulation of the flow amplitude of the flow of breathing gas, to implement an HFPPV mode with an extended range for the frequency, the duty cycle, a flow level, and the mean airway pressure of positive pressure ventilation including 2 Hz and 25 Hz based on the simultaneous control; and

    providing by the controller physiologic volumes interspersed with high frequency sub-physiologic volumes by intermittently modulating the mean airway pressure,wherein the mean airway pressure is modulated by intermittently varying an exhalation resistance,wherein the simultaneous control and the implementing of the HFPPV mode is in response to the determination, andwherein the HFPPV mode is implemented by delivering the modulated flow of breathing gas via a pressure generating system through a patient circuit, in accordance with the adjusted mean airway pressure, and the modulated frequency and duty cycle.

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