HopeFlo is a high flow nasal cannula (HFNC) system that can be used to treat COVID patients. At the heart of the system is a simple air-oxygen proportioning and blending mechanism to control two parameters. The percentage of oxygen, and flow rate. This system can be connected to air and oxygen lines in a hospital, and used fornon invasive ventilation. Once the oxygen – air mixture is ready, it is humidified and slightly heated to maximise patient comfort. This mixture is then fed to the patient through a nasal cannula.
We use custom electronics to control the valves using stepper motors. The doctor chooses settings on the HMI, and our software calculates the valve opening angles to achieve the set parameters. There is a basic pressure feedback loop, which makes sure that the system is working correctly.