System and method of predicting CO₂breakthrough and absorbent replacement

摘要

The system and method of the present application predicts if there is sufficient CO2 absorbent capacity for the next anesthesia case. If insufficient, the canister can be preemptively replaced when no patient is connected to the breathing system. Such prediction also allows clinicians to determine if the CO2 canister has to be changed during the present case or to wait until the end of the case. In the latter, the clinician may buy time by increasing the fresh gas flow rate to reduce the amount of patient CO2 gases recirculated. A predictive estimation of CO2 breakthrough allows more time to prepare for an orderly CO2 canister replacement during a quiet period in the anesthesia care.

主权项

1. A computerized method of predicting carbon dioxide (CO2) breakthrough in an anesthesia ventilator, the method comprising:
inputting into a computing system a minimum detectable inspired CO2 concentration (FiCO2) threshold and a CO2 absorbent replacement threshold; inputting into the computing system a set of data received from the anesthesia ventilator, wherein the set of data includes a measured FiCO2; determining whether the measured FiCO2 exceeds the minimum detectable FiCO2 threshold; extrapolating a number of breaths for the measured FiCO2 to reach the CO2 absorbent replacement threshold; and calculating a CO2 absorbent replacement time with the number of breaths and a breaths interval time.