Session
2023 session 1
Location
Weber State University
Start Date
5-8-2023 9:15 AM
Description
Administration of CPAP in moderate sedation medical procedures has been shown to reduce the risk of oxygen desaturation. Venturi adapters provide a more cost-efficient and logistically feasible alternative to non-invasive ventilators for administering CPAP. Flow-to-pressure tables provided with commercially available CPAP Venturi adapters do not account for inherent variables such as mask leak flow and inhalation flow rate. A dynamic model was developed to describe the pressure and oxygen behavior of a CPAP system utilizing a Venturi adapter. The model was evaluated to reflect system behavior with reasonable accuracy but high computational expense. PID and sliding mode controllers were implemented and simulated based on the dynamic model developed and demonstrated that feedback control automatically adjusts the input flow rate to maintain the desired airway pressure despite leak flow and inhalation flow rate. The sliding mode controller was the most effective at rejecting breathing and leak disturbances to maintain the desired pressure, but at a high computational expense and stress on flow actuators, and thus the PID controller may be the more practical option for implementing feedback control with a Venturi adapter in a physical system for administering CPAP. A PID controller was implemented in a physical system, and the feasibility of real-time pressure control with a Venturi adapter for CPAP was demonstrated.
Venturi Adapters – Feedback Control and Dynamic Modeling Simulation
Weber State University
Administration of CPAP in moderate sedation medical procedures has been shown to reduce the risk of oxygen desaturation. Venturi adapters provide a more cost-efficient and logistically feasible alternative to non-invasive ventilators for administering CPAP. Flow-to-pressure tables provided with commercially available CPAP Venturi adapters do not account for inherent variables such as mask leak flow and inhalation flow rate. A dynamic model was developed to describe the pressure and oxygen behavior of a CPAP system utilizing a Venturi adapter. The model was evaluated to reflect system behavior with reasonable accuracy but high computational expense. PID and sliding mode controllers were implemented and simulated based on the dynamic model developed and demonstrated that feedback control automatically adjusts the input flow rate to maintain the desired airway pressure despite leak flow and inhalation flow rate. The sliding mode controller was the most effective at rejecting breathing and leak disturbances to maintain the desired pressure, but at a high computational expense and stress on flow actuators, and thus the PID controller may be the more practical option for implementing feedback control with a Venturi adapter in a physical system for administering CPAP. A PID controller was implemented in a physical system, and the feasibility of real-time pressure control with a Venturi adapter for CPAP was demonstrated.