LEAK-COMPENSATED PROPORTIONAL ASSIST VENTILATION
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Abstract
This disclosure describes systems and methods for compensating for leakage when during delivery of gas from a medical ventilator in a proportional assist mode to a patient. The technology described herein includes systems and methods to compensate the delivery of PA ventilation for leakage in the patient circuit by using leak-compensated lung flows as well as leak-compensated respiratory mechanics parameters (lung compliance and lung resistance) estimated in a manner that compensates for elastic and inelastic leaks from the ventilation system.
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Citations
40 Claims
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1-20. -20. (canceled)
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21. A method of compensating for leakage in a ventilation tubing system during delivery of proportional assist ventilation to a patient comprising:
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receiving a support setting identifying an amount of proportional assistance to provide to the patient; receiving at least one of a pressure measurement and a flow measurement in the ventilation tubing system; modeling leakage from the ventilation tubing system as a first leakage component through a first orifice of a fixed size and a second leakage component through a second orifice of a varying size; estimating a lung compliance of the patient and a lung resistance of the patient based on the first leakage, the second leakage, and the at least one of the pressure measurement and the flow measurement; estimating patient effort based on the first leakage, the second leakage, the lung compliance, the lung resistance, and the at least one of the pressure measurement and the flow measurement; and delivering ventilation to the patient based on the estimated patient effort and the support setting. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A pressure support system comprising:
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a pressure generating system adapted to generate a flow of breathing gas; a ventilation tubing system including a patient interface device for connecting the pressure generating system to a patient; one or more sensors operatively coupled to the pressure generating system or the ventilation tubing system, each sensor capable of generating an output indicative of a pressure or a flow of the breathing gas; a leak estimation module that estimates leakage from the ventilation tubing system; a patient effort estimation module that estimates patient effort based on the leakage and an output of at least one sensor; and a proportional assistance ventilation module that causes the pressure generating system to provide ventilation to the patient based on patient effort and a support setting. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A controller for a medical ventilator comprising:
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a microprocessor; a leak estimation module that estimates instantaneous elastic leakage and instantaneous inelastic leakage of breathing gas from a ventilation tubing system; a module that compensates calculations of lung compliance and lung resistance based on the instantaneous elastic leakage and the instantaneous inelastic leakage; and a pressure generating module controlled by the microprocessor that provides proportional assist ventilation based on the compensated lung compliance and lung resistance.
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34. A method of compensating for leakage in a ventilation tubing system during delivery of proportional assist ventilation to a patient comprising:
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receiving a support setting identifying an amount of proportional assistance to provide to the patient; receiving at least one of a pressure measurement and a flow measurement associated with the ventilation tubing system; estimating leakage from the ventilation tubing system based on the at least one of the pressure measurement and the flow measurement; estimating a lung compliance of the patient and a lung resistance of the patient based on the estimated leakage and the at least one of the pressure measurement and the flow measurement; estimating patient effort based on the estimated leakage, the lung compliance, the lung resistance, and the at least one of the pressure measurement and the flow measurement; and delivering ventilation to the patient based on the estimated patient effort and the support setting. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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Specification