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Leak determination in a breathing assistance system

  • US 8,707,952 B2
  • Filed: 04/29/2010
  • Issued: 04/29/2014
  • Est. Priority Date: 02/10/2010
  • Status: Active Grant
First Claim
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1. A breathing assistance system for providing breathing assistance to a patient, comprising:

  • a pneumatic system for providing breathing assistance to a patient; and

    a controller configured to control one or more operational parameters of the pneumatic system, the controller configured to estimate a leak flow in a breathing assistance system including a ventilation device connected to a patient by;

    accessing data of a flow waveform indicating the flow of gas between the ventilation device and the patient;

    identifying a specific portion of the flow waveform as a steady phase portion; and

    performing a linear regression of the identified portion of the flow waveform to determine an estimated leak flow in the breathing assistance system;

    wherein identifying the steady phase portion comprises;

    identifying a reference period of the flow waveform;

    determining a representative flow rate for the reference period;

    determining a series of one or more consecutive qualifying periods of the flow waveform having representative flow rates that vary from the representative flow rate for the reference period by less than a predetermined amount; and

    defining the steady phase portion as including the reference period and the series of one or more consecutive qualifying periods.

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