METHODS AND SYSTEMS FOR TRIGGERING WITH UNKNOWN BASE FLOW
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Abstract
This disclosure describes systems and methods for providing novel back-up ventilation that allows the patient to trigger or initiate the delivery of breath. Further, this disclosure describes systems and methods for triggering ventilation when base flow is unknown or undeterminable by the ventilator.
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Citations
41 Claims
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1-21. -21. (canceled)
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22. A method for ventilating a patient with a ventilator, comprising:
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delivering a fixed base flow; determining a stable portion of exhalation; monitoring an exhalation flow during the stable portion of exhalation and in the absence of a determinable inspiratory flow; estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; determining that a flow derivation based on the estimated base flow is greater than an inspiratory trigger threshold during the stable portion of exhalation; and triggering inspiration based on the determining that the flow derivation is greater than the inspiratory trigger threshold. - View Dependent Claims (23, 24, 25, 27, 28, 29, 30)
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31. A ventilator system comprising:
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a pressure generating system adapted to generate a flow of breathing gas; wherein the pressure generating system delivers a fixed base flow, a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient; at least one sensor operatively coupled to at least one of the pressure generating system, the patient, and the ventilation tubing system, wherein the at least one sensor is capable of generating an output indicative of an exhalation flow; a base flow estimator module for determining a stable portion of exhalation, monitoring the exhalation flow during the stable portion of exhalation based on the output, and for estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation and in the absence of determinable inspiratory flow; and a trigger module that determines that a flow derivation based on an estimated base flow is greater than an inspiratory trigger threshold and then triggers inspiration. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A computer-readable medium having computer-executable instructions for ventilating a patient with a ventilator, the instructions comprising:
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deliver a fixed base flow that is undeterminable; determine a stable portion of exhalation; monitor an exhalation flow during the stable portion of exhalation; estimate a base flow based on the exhalation flow monitored during the stable portion of exhalation; determine that a flow derivation based on the estimated base flow is greater than an inspiratory trigger threshold during the stable portion of exhalation; and trigger inspiration based on the determining that the flow derivation is greater than the inspiratory trigger threshold.
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40. A computer-readable medium having computer-executable instructions for ventilating a patient with a ventilator, the instructions comprising:
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deliver a fixed base flow that is undeterminable; monitor a windowed differential lung volume during exhalation; determine that the windowed differential lung volume is at about zero after a decreasing trend toward zero; and trigger inspiration based on the first of at least one of the following events to occur; a net negative change in lung volume with increasing magnitude is detected that is greater than an inspiratory trigger threshold directly after the step of determining that the windowed differential lung volume is about zero; and a predetermined amount of time expires.
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41. A computer-readable medium having computer-executable instructions for ventilating a patient with a ventilator, instructions comprising:
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deliver a fixed base flow that is undeterminable; determine a stable portion of exhalation; monitor an exhalation flow during the stable portion of exhalation; estimate a base flow based on the exhalation flow monitored during the stable portion of exhalation; and trigger inspiration based on the first of at least one of the following events to occur; a flow derivation based on the estimated base flow is detected that is greater than an inspiratory trigger threshold during the stable portion of exhalation; and expiration of a predetermined amount of time.
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Specification