Leak determination in a breathing assistance system
AssigneeCovidien LP
InventorsCedric Jourdain, Olivier Bernadet
Life of this patent
Estimating the term…
Abstract
Systems and methods for estimating a leak flow in a breathing assistance system including a ventilation device connected to a patient are provided. Data of a flow waveform indicating the flow of gas between the ventilation device and the patient is accessed. A specific portion of the flow waveform is identified, and a linear regression of the identified portion of the flow waveform is performed to determine an estimated leak flow in the breathing assistance system.
Claims21
-23. (canceled)
A breathing assistance system including a ventilation device for delivering respiratory gases to a patient, the breathing assistance system having a controller for estimating a leak flow by:
- monitoring a flow of gas between the ventilation device and the patient, wherein the monitored flow of gas is represented by a flow waveform;
- determining a first flow rate for a first period of the flow waveform;
- determining a second flow rate for at least a second period of the flow waveform;
- defining a steady phase portion of the flow waveform to include the first period and the second period when the second flow rate varies from the first flow rate by less than a predetermined amount;
- determining an estimated leak flow based on the steady phase portion of the flow waveform;
- and
- in response to determining the estimated leak flow, controlling at least one of one or more operational parameters to target a positive end expiratory pressure (PEEP).
A method for estimating a leak flow in a breathing assistance system including a ventilation device connected to a patient, the method comprising:
- monitoring a flow of gas between the ventilation device and the patient, wherein the monitored flow of gas is represented by a flow waveform;
- determining a first representative flow rate for a first period of the flow waveform;
- determining a second representative flow rate for at least a second period of the flow waveform;
- defining a steady phase portion of the flow waveform to include the first period and the second period when the second representative flow rate varies from the first representative flow rate by less than a predetermined amount;
- determining an estimated leak flow based on the steady phase portion of the flow waveform;
- and
- in response to determining the estimated leak flow, adjusting at least one operational parameter of the ventilation device to detect a triggering event.
A ventilation device comprising:
- at least one processor;
- and
- at least one memory storing computer-readable instructions that when executed by the at least one processor cause the ventilation device to:
- monitor a flow of gas between the ventilation device and the patient, wherein the monitored flow of gas is represented by a flow waveform;
- determine a first representative flow rate for a first period of the flow waveform;
- determine a second representative flow rate for at least a second period of the flow waveform;
- define a steady phase portion of the flow waveform to include the first period and the second period when the second representative flow rate varies from the first representative flow rate by less than a predetermined amount;
- and
- determine an estimated leak flow based on the steady phase portion of the flow waveform;
- and
- control at least one of one or more operational parameters based on the estimated leak flow to deliver an adjusted pressure of gas to the patient.
Dependencies are inferred from the claim text.