We are developing the open Respiratory Profile Monitoring (openRPM) system to provide real-time proximal monitoring of ventilated COVID-19 patients. Here we provide the standalone openRPM flow meter design that can be used for measurement of flow during inhalation and exhalation, capable of sensing air pressure (±100 cm H2O) and flow administered to a ventilated patient.
The openRPM flow meter can be 3D printed or injection molded as a single part using autoclavable plastic resins. The dimensions are compatible with standard ventilator tubing. The flow meter is a mainstream device that would be placed between the ventilator tubing and endotracheal tube. The flow meter allows for measurement of differential and gage pressures from its ports. This facilitates real-time determination of ventilator parameters, including but not limited to: respiratory rate, inhaled and exhaled air volumes, respiratory phase time durations/ratios, inspiratory and expiratory tidal volumes, positive end-expiratory pressure (PEEP), peak inspiratory pressure (PIP), and mean pressure.
