Using estimated carinal pressure for feedback control of carinal pressure during ventilation

摘要

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.

主权项

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.