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;
determining, by the ventilator, an initial inspiratory trigger threshold;
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 subsequent base flow during at least a second portion of exhalation;
decreasing the inspiratory trigger threshold from the initial inspiratory trigger threshold toward a subsequent inspiratory trigger threshold while changing the base flow;
determining a change in the estimated leak flow;
progressively adjusting the base flow according to an exponential trajectory in a set time period during at least the second portion of exhalation to compensate for the determined change in the estimated leak flow; and
progressively 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.
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Citations
18 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; determining, by the ventilator, an initial inspiratory trigger threshold; 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 subsequent base flow during at least a second portion of exhalation; decreasing the inspiratory trigger threshold from the initial inspiratory trigger threshold toward a subsequent inspiratory trigger threshold while changing the base flow; determining a change in the estimated leak flow; progressively adjusting the base flow according to an exponential trajectory in a set time period during at least the second portion of exhalation to compensate for the determined change in the estimated leak flow; and progressively 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)
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15. A ventilator system comprising:
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a pressure generating system configured to generate a flow of breathing gas; a ventilation tubing system including a patient interface configured to connect the pressure generating system to a patient; at least one sensor operatively coupled to at least one of the pressure generating system and the ventilation tubing system; a leak estimation module configured to determine a change in an estimated leak flow in the ventilation tubing system by utilizing output from the at least one sensor; a base flow trajectory module configured to deliver a base flow including the estimated leak flow during exhalation to the patient, wherein the base flow trajectory module changes the base flow delivered to the patient from an initial base flow toward a subsequent base flow during at least a portion of the exhalation, and wherein the base flow trajectory module progressively adjusts the base flow according to an exponential trajectory during a set time period during the exhalation to compensate for the determined change in the estimated leak flow; an inspiratory trigger threshold trajectory module configured to set an inspiratory trigger threshold during exhalation, wherein the inspiratory trigger threshold trajectory module decreases the inspiratory trigger threshold from an initial inspiratory trigger threshold towards a subsequent inspiratory trigger threshold while the base flow trajectory module changes the base flow delivered to the patient; and a processor in communication with the pressure generating system, the at least one sensor, the leak estimation module, the inspiratory trigger threshold trajectory module, and the base flow trajectory module. - View Dependent Claims (16, 17, 18)
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Specification