Methods and systems for triggering with unknown base flow
First Claim
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1. A method for ventilating a patient with a ventilator, comprising:
- delivering a fixed base flow that is undeterminable;
monitoring a windowed differential lung volume during exhalation;
determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; and
triggering 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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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.
823 Citations
20 Claims
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1. A method for ventilating a patient with a ventilator, comprising:
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delivering a fixed base flow that is undeterminable; monitoring a windowed differential lung volume during exhalation; determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; and triggering 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for ventilating a patient with a ventilator, comprising:
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delivering a fixed base flow that is undeterminable; determining a stable portion of exhalation; monitoring an exhalation flow during the stable portion of exhalation; estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; and triggering 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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13. 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 an undeterminable 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; a lung volume module for monitoring a windowed differential lung volume during exhalation and for determining when the windowed differential lung volume is at about zero after a decreasing trend toward zero; and a trigger module for triggering 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 directly after the lung volume module determines that the windowed differential lung volume is about zero that is greater than an inspiratory trigger threshold, and a predetermined amount of time expires. - View Dependent Claims (14, 15)
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16. 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 an undeterminable 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 a trigger module for triggering inspiration based on the first of at least one of the following events to occur; a flow derivation based on an estimated base flow is detected that is greater than an inspiratory trigger threshold, and a predetermined amount of time expires.
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17. A computer-readable medium having computer-executable instructions for performing a method of ventilating a patient with a ventilator, the method comprising:
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repeatedly delivering a fixed base flow that is undeterminable; repeatedly monitoring a windowed differential lung volume during exhalation; repeatedly determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; and repeatedly triggering 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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18. A ventilator system, comprising:
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means for delivering a fixed base flow that is undeterminable; means for monitoring a windowed differential lung volume during exhalation; means for determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; and means for triggering 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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19. A computer-readable medium having computer-executable instructions for performing a method of ventilating a patient with a ventilator, the method comprising:
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repeatedly delivering a fixed base flow that is undeterminable; repeatedly determining a stable portion of exhalation; repeatedly monitoring an exhalation flow during the stable portion of exhalation; repeatedly estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; and repeatedly triggering 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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20. A ventilator system, comprising:
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means for delivering a fixed base flow that is undeterminable; means for determining a stable portion of exhalation; means for monitoring an exhalation flow during the stable portion of exhalation; means for estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; and means for triggering 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