High-Flow and High-Pressure Oxygen Mixing for Ventilator System

The treatment of patients with acute respiratory failure due to COVID-19 needs ventilator machine support to provide oxygenation and ventilation processes. The most critical control in the machine is how to provide precision-inspired oxygen fraction (FiO2) to the patients during the treatment. Generally, the low-flow nasal cannula can provide 4-6 liters per minute of supplemental oxygen with approximately 37 - 45% FiO2. In this paper, we present high-flow and high-pressure oxygen mixing to provide up to 100% FiO2 and 60 liters per minute. The proposed system also employs the close-loop feedback control to achieve a desirable FiO2 set point. It can be used for a Continuous Positive Airway Pressure (CPAP) and Bilevel Positive Airway Pressure (BiPAP) ventilator systems with oxygen as well as a High Flow Nasal Cannula (HFNC) system for acute respiratory patient’s syndrome.