Leak-compensated proportional assist ventilation
First Claim
1. A method of compensating for leakage in a ventilation tubing system during delivery of proportional assist ventilation to a patient, wherein the method is performed by a ventilation system having a memory storing a computer-readable instructions and a processor, the processor executing the computer-readable instructions for performing the method comprising:
- 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 through a first orifice of a fixed size that is estimated as a first function of at least one of the pressure measurement and the flow measurement and a second leakage through a second orifice of a varying size that is estimated as a second function of 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 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.
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Accused Products
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
18 Claims
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1. A method of compensating for leakage in a ventilation tubing system during delivery of proportional assist ventilation to a patient, wherein the method is performed by a ventilation system having a memory storing a computer-readable instructions and a processor, the processor executing the computer-readable instructions for performing the method 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 through a first orifice of a fixed size that is estimated as a first function of at least one of the pressure measurement and the flow measurement and a second leakage through a second orifice of a varying size that is estimated as a second function of 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 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 (2, 3, 4, 5, 6)
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7. 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 by identifying an inelastic leakage in the ventilation tubing system as a first function of an output of at least one sensor, and identifying an elastic leakage in the ventilation system as a second function of an output of at least one sensor; 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 (8, 9, 10, 11)
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12. A controller for a medical ventilator comprising:
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a microprocessor; a leak estimation module that estimates instantaneous elastic leakage of breathing gas from a ventilation tubing system as a first function of and output of at least one sensor and instantaneous inelastic leakage of breathing gas from the ventilation tubing system as a second function of an output of at least one sensor; 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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13. A method of compensating for leakage in a ventilation tubing system during delivery of proportional assist ventilation to a patient, wherein the method is performed by a ventilation system having a memory storing a computer-readable instruction and a processor, the processor executing the computer-readable instruction for performing the method 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, comprising; identifying an inelastic leakage in the ventilation system as a first function of the at least one of the pressure measurement and the flow measurement; and identifying an elastic leakage in the ventilation system as a second function of 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 (14, 15, 16, 17, 18)
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Specification