Using estimated carinal pressure for feedback control of carinal pressure during ventilation
First Claim
1. A ventilator-implemented method for controlling delivery of gas flow to a patient, the method comprising:
- delivering gas flow to the patient based on a carinal pressure command;
receiving a signal representative of a pressure at a patient wye;
calculating a pressure drop across a breathing tube extending from the patient wye to about the carina of the patient;
estimating a carinal pressure by subtracting the pressure drop across the breathing tube from the pressure at the patient wye;
comparing the estimated carinal pressure to the carinal pressure command; and
controlling delivery of gas flow to the patient based on comparing the estimated carinal pressure and the carinal pressure command.
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Accused Products
Abstract
This disclosure describes systems and methods for configuring a ventilator to estimate the carinal pressure to minimize the work of breathing due to a breathing tube. A patient'"'"'s carina is a cartilaginous ridge located at the site of the tracheal bifurcation between the two primary bronchi. An estimated carinal pressure (a pressure estimated to exist at the patient carina) may be determined and used as feedback control for the carinal pressure. According to embodiments, the estimated carinal pressure may be compared to the carinal pressure command to determine an error. The carinal pressure command may be positive end expiratory pressure (PEEP) or some other suitable target pressure. The error between the estimated carinal pressure and the carinal pressure command may then be used as feedback control to achieve the carinal pressure command and thereby to minimize the work of breathing due to the breathing tube.
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Citations
20 Claims
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1. A ventilator-implemented method for controlling delivery of gas flow to a patient, the method comprising:
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delivering gas flow to the patient based on a carinal pressure command; receiving a signal representative of a pressure at a patient wye; calculating a pressure drop across a breathing tube extending from the patient wye to about the carina of the patient; estimating a carinal pressure by subtracting the pressure drop across the breathing tube from the pressure at the patient wye; comparing the estimated carinal pressure to the carinal pressure command; and controlling delivery of gas flow to the patient based on comparing the estimated carinal pressure and the carinal pressure command. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A ventilator system for controlling delivery of gas flow to a patient, the ventilator system comprising:
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at least one processor; and at least one memory communicatively coupled to the at least one processor and containing instructions that, when executed by the at least one processor, cause the ventilator system to; deliver gas flow to the patient based on a carinal pressure command; receive a signal representative of a pressure at a patient wye; calculate a pressure drop across a breathing tube extending from the patient wye to about the carina of the patient; estimate a carinal pressure by subtracting the pressure drop across the breathing tube from the pressure at the patient wye; compare the estimated carinal pressure to the carinal pressure command; and control delivery of gas flow to the patient based on comparing the estimated carinal pressure and the carinal pressure command. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A ventilator processing interface for controlling delivery of gas flow to a patient, the ventilator processing interface comprising:
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means for delivering gas flow to the patient based on a carinal pressure command; means for receiving a signal representative of a pressure at a patient wye; means for calculating a pressure drop across a breathing tube extending from the patient wye to about the carina of the patient; means for estimating a carinal pressure by subtracting the pressure drop across the breathing tube from the pressure at the patient wye; means for comparing the estimated carinal pressure to the carinal pressure command; and means for controlling delivery of gas flow to the patient based on comparing the estimated carinal pressure and the carinal pressure command. - View Dependent Claims (16, 17, 18)
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19. A non-transitory computer storage medium having computer-executable instructions that when executed by a processor cause a ventilator system to:
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deliver gas flow to the patient based on a carinal pressure command; receive a signal representative of a pressure at a patient wye; calculate a pressure drop across a breathing tube extending from the patient wye to about the carina of the patient; estimate a carinal pressure by subtracting the pressure drop across the breathing tube from the pressure at the patient wye; compare the estimated carinal pressure to the carinal pressure command; and control delivery of gas flow to the patient based on comparing the estimated carinal pressure and the carinal pressure command. - View Dependent Claims (20)
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Specification