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US 10,537,279 B2Granted
Methods for providing expiratory pressure relief in positive airway pressure therapy
AssigneeResMed Pty Ltd
InventorDavid John Bassin
Life of this patent
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AssigneeResMed Pty Ltd
InventorDavid John Bassin
Estimating the term…
A method of operating a CPAP apparatus in which the interface pressure is controlled to rapidly drop at the start of expiration by an expiratory relief pressure (ERP) that is independent of instantaneous respiratory flow, following which the pressure rises to an inspiratory level at or shortly before the end of expiration, or at the onset of an expiratory pause, if any. The ERP is an increasing function of the inspiratory pressure. The expiratory pressure follows a template that is a function of the expected expiration time, the magnitude of the template being equal to the ERP. The current estimated proportion of expiration is determined by comparing the expiration time of the breath in progress to low-pass filtered expiratory durations measured for a number of the preceding breaths.
A method of operating a CPAP device to detect an expiratory pause, using a microcontroller, in a breath comprising the steps of:
A method of operating a CPAP device to determine duration of an expiratory pause, using a microcontroller, the method comprising the step of determining a duration of a longest contiguous period ending at an end of expiration such that respiratory flow during that period does not lie outside a range of values which represents small flow.
A method of operating a CPAP device to determine an expiratory pause fraction of a breath, k, using a microcontroller, the method comprising the steps of:
A CPAP device that detects an expiratory pause, comprising:
Dependencies are inferred from the claim text.