Methods and systems for adaptive base flow and leak compensation
First Claim
1. A method for improving an accuracy of estimating an exhalation volume while ventilating a patient with a ventilator, the ventilator comprising at least one processor and at least one memory, the method comprising:
- delivering a base flow to a patient during exhalation, wherein the base flow includes an estimated leak flow;
determining, by the ventilator, an initial base flow to improve the accuracy of estimating the exhalation volume;
determining, by the ventilator, an initial inspiratory trigger threshold to prevent false triggering while base flow is changing;
delivering the initial base flow during at least a first portion of the exhalation while setting an inspiratory trigger threshold to the initial inspiratory trigger threshold;
changing the base flow from the initial base flow toward a desired base flow during at least a second portion of exhalation;
decreasing the inspiratory trigger threshold from the initial inspiratory trigger threshold toward a desired inspiratory trigger threshold while performing the step of changing the base flow;
determining a change in the estimated leak flow; and
progressively adjusting the base flow in a set time period during at least the second portion of exhalation to compensate for the determined change in the estimated leak flow while adjusting the inspiratory trigger threshold in the set time period.
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Abstract
This disclosure describes systems and methods for providing adaptive base flow scheduling during ventilation of a patient to optimize patient-machine synchrony and accuracy of estimated exhaled as well as inhaled tidal volumes. Further, this disclosure describes systems and methods for providing adaptive inspiratory trigger threshold scheduling during the adaptive base flow scheduling. Further still, this disclosure describes systems and methods for determining an estimated leak flow and adjusting the adaptive base flow scheduling and the adaptive inspiratory trigger threshold scheduling based on the estimated leak flow. Moreover, this disclosure describes systems and methods for determining a change in the estimated leak flow and adjusting the adaptive base flow scheduling and the adaptive inspiratory trigger threshold scheduling based on the change in the estimated leak flow.
1115 Citations
25 Claims
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1. A method for improving an accuracy of estimating an exhalation volume while ventilating a patient with a ventilator, the ventilator comprising at least one processor and at least one memory, the method comprising:
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delivering a base flow to a patient during exhalation, wherein the base flow includes an estimated leak flow; determining, by the ventilator, an initial base flow to improve the accuracy of estimating the exhalation volume; determining, by the ventilator, an initial inspiratory trigger threshold to prevent false triggering while base flow is changing; delivering the initial base flow during at least a first portion of the exhalation while setting an inspiratory trigger threshold to the initial inspiratory trigger threshold; changing the base flow from the initial base flow toward a desired base flow during at least a second portion of exhalation; decreasing the inspiratory trigger threshold from the initial inspiratory trigger threshold toward a desired inspiratory trigger threshold while performing the step of changing the base flow; determining a change in the estimated leak flow; and progressively adjusting the base flow in a set time period during at least the second portion of exhalation to compensate for the determined change in the estimated leak flow while adjusting the inspiratory trigger threshold in the set time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A computer-readable medium having computer-executable instructions that when executed by a processor cause a ventilator to:
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deliver a base flow to a patient during exhalation, wherein the base flow includes an estimated leak flow; determine, by the ventilator, an initial base flow to improve an accuracy of estimating an exhalation volume; determine, by the ventilator, an initial inspiratory trigger threshold to prevent false triggering while base flow is changing; deliver the initial base flow during at least a first portion of the exhalation while setting an inspiratory trigger threshold to the initial inspiratory trigger threshold; change the base flow from the initial base flow toward a desired base flow during at least a second portion of exhalation; decrease the inspiratory trigger threshold from the initial inspiratory trigger threshold toward a desired inspiratory trigger threshold while performing the step of changing the base flow; determine a change in the estimated leak flow; and progressively adjust the base flow in a set time period during at least the second portion of exhalation to compensate for the determined change in the estimated leak flow while adjusting the inspiratory trigger threshold in the set time period. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification