Leak determination in a breathing assistance system
First Claim
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1. 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.
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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.
416 Citations
23 Claims
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1. A breathing assistance system including a ventilation device connected to a patient, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for estimating a leak flow in a breathing assistance system including a ventilation device connected to a patient, the method comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method performed by a breathing assistance system including a ventilation device connected to a patient, comprising:
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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. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification