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Servo ventilation using negative pressure support

  • US 9,463,293 B2
  • Filed: 12/17/2010
  • Issued: 10/11/2016
  • Est. Priority Date: 01/14/2010
  • Status: Active Grant
First Claim
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1. A system for delivering a flow of gas to an airway of a patient, the system comprising:

  • a gas flow generator configured to generate the flow of gas;

    a patient circuit coupled to the gas flow generator configured to communicate the flow of gas to the airway of the patient;

    a sensor configured to generate output signals related to a characteristic associated with the flow of gas; and

    a controller configured to selectively control the flow of gas to the airway of the patient, wherein flow into the patient is positive flow and flow out of the patient is negative flow, from the gas flow generator via the patient circuit by operating in;

    1) a first pressure mode responsive to the characteristic being below a first threshold, wherein the first pressure mode comprises providing the gas to the patient at a first inspiratory pressure during inspiration and a first expiratory pressure during expiration, and wherein the first inspiratory pressure is higher than the first expiratory pressure; and

    2) a second pressure mode responsive to the characteristic being above a second threshold, wherein the second pressure mode comprises providing the gas to the patient at a second inspiratory pressure during inspiration and a second expiratory pressure during expiration, wherein the second expiratory pressure is higher than the second inspiratory pressure, and wherein the controller is configured such that the first inspiratory pressure is a first inspiratory positive airway pressure (IPAP) level and the first expiratory pressure is a first expiratory positive airway pressure (EPAP) level, and wherein the first IPAP level is higher than the first EPAP level in the first pressure mode; and

    wherein the second inspiratory pressure is a second IPAP level and the second expiratory pressure is a second EPAP level, and wherein the second EPAP level is higher than the second IPAP level in the second pressure mode; and

    whereby the first IPAP, first EPAP, second IPAP, and second EPAP are positive gas pressure in a flow direction towards the patient.

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