Leak-compensated pressure regulated volume control ventilation
First Claim
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1. A pressure support system comprising:
- 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 flow of the breathing gas in the ventilation tubing system;
a leak estimation module that identifies an elastic leakage in the ventilation tubing system as a first function of an output of at least one sensor and an inelastic leakage in the ventilation tubing system as a second function of an output of at least one sensor;
a delivered lung volume module that calculates a leak-compensated delivered lung volume for a first breath based on the leakage during the first breath and the flow of the breathing gas in the ventilation tubing system;
a respiratory mechanics calculation module that generates a leak-compensated lung compliance based on the leak-compensated delivered lung volume and at least one output indicative of a pressure of the breathing gas during the first breath; and
a pressure control module that causes the pressure generating system to deliver a second breath to the patient at a target pressure calculated based on the leak-compensated lung compliance and the leak-compensated delivered lung volume.
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Abstract
This disclosure describes systems and methods for compensating for leakage when during delivery of gas to a patient from a medical ventilator in a pressure regulated volume control (PRVC) ventilation mode. The technology described herein includes systems and methods that compensate the delivery of PRVC ventilation for leakage in the patient circuit by using leak-compensated lung flows as well as respiratory mechanics (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
8 Claims
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1. 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 flow of the breathing gas in the ventilation tubing system; a leak estimation module that identifies an elastic leakage in the ventilation tubing system as a first function of an output of at least one sensor and an inelastic leakage in the ventilation tubing system as a second function of an output of at least one sensor; a delivered lung volume module that calculates a leak-compensated delivered lung volume for a first breath based on the leakage during the first breath and the flow of the breathing gas in the ventilation tubing system; a respiratory mechanics calculation module that generates a leak-compensated lung compliance based on the leak-compensated delivered lung volume and at least one output indicative of a pressure of the breathing gas during the first breath; and a pressure control module that causes the pressure generating system to deliver a second breath to the patient at a target pressure calculated based on the leak-compensated lung compliance and the leak-compensated delivered lung volume. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A controller for a medical ventilator comprising:
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a microprocessor; a leak estimation module that identifies an instantaneous inelastic leakage in a ventilation tubing system as a first function of an output of at least one sensor; and
an instantaneous elastic leakage in the ventilation tubing system as a second function of an output of at least one sensor;a module that calculates leak-compensated delivered lung volume and leak-compensated lung compliance based on the instantaneous elastic leakage and the instantaneous inelastic leakage of breathing gas from the ventilation tubing system; and a pressure control module that provides pressure regulated volume control ventilation at a pressure determined based on the leak-compensated delivered lung volume and the leak-compensated lung compliance. - View Dependent Claims (8)
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Specification