System Design Verification for Closed Loop Control of Oxygenation With Concentrator Integration

Area of Science:

• Biomedical Engineering
• Respiratory Care

Background:

• Autonomous control of oxygenation is advanced by integrating an oxygen concentrator into a control loop.
• Software synchronizes oxygen concentrator and ventilator functions for efficient oxygen delivery, timing pulses to the start of each breath.

Purpose of the Study:

• To verify the functionality and efficiency of a novel autonomous oxygenation control system.
• To compare the effectiveness of pulse dose versus continuous flow oxygenation from an oxygen concentrator.

Main Methods:

• System performance was evaluated using a test lung across various clinically relevant ventilator settings in volume control mode.
• Fraction of inspired oxygen (FIO2) and other data were monitored for both continuous flow and pulse dose oxygenation.

Main Results:

• The oxygen concentrator maintained maximum pulse output up to 16 breaths per minute.
• Pulse dose oxygenation consistently delivered higher peak FIO2 (76.83%) compared to continuous flow (47.81%) across all tested settings (p < 0.001).
• System functionality was confirmed across diverse tidal volumes, respiratory rates, and with/without positive end-expiratory pressure.

Conclusions:

• The verified system enables closed-loop oxygenation control with time-coordinated pulse doses from an oxygen concentrator.
• This integrated approach optimizes resource utilization, particularly in resource-limited or austere environments.