Method of CO2 measurement during non-invasive ventilation

A non-invasive ventilator configured to measure a patient's expired CO2 level while maintaining a positive inspiratory pressure, the non-invasive ventilator comprising:

• a user interface configured to receive, from a user, a signal comprising an instruction to obtain a CO2 measurement from the patient during a user-defined first time period comprising-one or more breaths;
• a CO2 sensor configured to obtain one or more expired CO2 measurements from the patient during the user-defined first time period the one or more expired CO2 measurements including the CO2 measurement;
• and
• a controller in communication with the CO2 sensor, the controller configured to:
• lower, in response to the signal for the user-defined first time period, (i) an expiratory positive airway pressure from a first, higher level to a second, lower level, and (ii) an inspiratory positive airway pressure of the non-invasive ventilatory system from a third, higher level to a fourth, lower level;
• direct the CO2 sensor to obtain the CO2 measurement during the user-defined first time period;
• track the one or more breaths;
• and return, after termination of the user-defined first time period, the expiratory positive airway pressure to the first, higher level and the inspiratory positive airway pressure to the third, higher level.

A controller of a non-invasive ventilator system configured to measure a patient's expired CO2 level while maintaining a positive inspiratory pressure, the controller configured to perform steps comprising:

• receive, from a user interface of the non-invasive ventilator system, a first control signal comprising an instruction to obtain a CO2 measurement from a patient for a user-defined first time period;
• lower, in response to the first control signal for the user-defined first time period comprising one or more breaths, (i) an expiratory positive airway pressure of the non-invasive ventilator system from a first, higher level to a second, lower level, and (ii) the inspiratory positive airway pressure of the non-invasive ventilator system from a third, higher level to a fourth, lower level, wherein the controller is configured to send a second control signal to a blower of the non-invasive ventilator system;
• send the first control signal to a CO2 sensor of the non-invasive ventilator system, the first control signal comprising instructions to obtain the CO2 measurement during the user-defined first time period;
• track the one or more breaths;
• and
• return, after termination of the user-defined first time period, the expiratory positive airway pressure to the first, higher level and the inspiratory positive airway pressure to the third, higher level.