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.
Claims23
A breathing assistance system including a ventilation device connected to a patient, comprising:
- a pneumatic system for providing breathing assistance to the 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 the breathing assistance system by:
- providing a flow waveform that depicts a flow of gas between the ventilation device and the patient;
- identifying a specific portion of the flow waveform as a steady phase portion, comprising:
- identifying a first period of the flow waveform;
- determining a first representative flow rate for the first period;
- identifying at least a second period of the flow waveform;
- determining a second representative flow rate for the second period;
- and
- defining the steady phase portion 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
- performing an interpolation of the steady phase portion of the flow waveform to determine an estimated leak flow in the breathing assistance system.
A method for estimating a leak flow in a breathing assistance system including a ventilation device connected to a patient, the method comprising:
- providing a flow waveform that depicts a flow of gas between the ventilation device and the patient;
- identifying a specific portion of the flow waveform as a steady phase portion, comprising:
- identifying a first period of the flow waveform;
- determining a first representative flow rate for the first period;
- identifying at least a second period of the flow waveform;
- determining a second representative flow rate for the second period;
- and
- defining the steady phase portion 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
- performing an interpolation of the steady phase portion of the flow waveform to determine an estimated leak flow in the breathing assistance system.
A method performed by a breathing assistance system including a ventilation device connected to a patient, comprising:
- providing breathing assistance to the patient according to one or more operational parameters;
- estimating a leak flow by:
- providing a flow waveform that depicts a flow of gas between the ventilation device and the patient;
- identifying a specific portion of the flow waveform as a steady phase portion, comprising:
- identifying a first period of the flow waveform;
- determining a first representative flow rate for the first period;
- identifying at least a second period of the flow waveform;
- determining a second representative flow rate for the second period;
- and
- defining the steady phase portion 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
- performing an interpolation of the steady phase portion of the flow waveform to determine the estimated leak flow in the breathing assistance system;
- and
- in response to determining the estimated leak flow, controlling at least one of the one or more operational parameters.
Dependencies are inferred from the claim text.