Closed Loop Oxygen Control
Patent No. EP3691727 (titled "Closed Loop Oxygen Control") was filed by Fisher & Paykel Healthcare on Oct 5, 2018. The application was issued on Jan 22, 2025.
Patent Summary
A respiratory apparatus delivers nasal high flow gases via a non-sealed cannula using a flow generator that mixes oxygen and ambient air. A controller manages a supplementary gas inlet valve and the flow generator via closed-loop control to regulate the delivered oxygen fraction ($\text{F}_{\text{d}}\text{O}_2$). The controller receives $\text{SpO}_2$ data from a pulse oximeter and utilizes an ultrasonic sensor system to measure $\text{F}_{\text{d}}\text{O}_2$. A first control loop determines a target $\text{F}_{\text{d}}\text{O}_2$ based on target and measured $\text{SpO}_2$, further adjusted by measured $\text{F}_{\text{d}}\text{O}_2$ and/or a previous target $\text{F}_{\text{d}}\text{O}_2$. The system may employ patient-specific models, PID control, and Smith predictors to account for signal lag, while calculating oxygen efficiency to optimize therapy and predicting $\text{SpO}_2$ based on measured $\text{F}_{\text{d}}\text{O}_2$.
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EP3691727
- Application Number
- EP18864962A
- Filing Date
- Oct 5, 2018
- Status
- Granted And Under Opposition
- Dec 20, 2024
- Publication Date
- Jan 22, 2025
- External Links
- Slate, Register , Google Patents