Flow Therapy Oxygen Control via Feedback Valve Adjustment
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Solution Overview
Problem
Existing respiratory apparatuses face challenges in maintaining consistent oxygen delivery to patients, particularly in fluctuating flow rates, requiring manual adjustments that are difficult to manage and cannot account for real-time changes in respiratory patterns.
Innovation Solution
A control system for a flow therapy apparatus that includes a controller to automatically adjust the valve current based on target oxygen fraction (FdO2) and real-time gas composition measurements, using models and feedback loops to maintain target oxygen delivery despite varying flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adjustment of valve settings is used, then device complexity is reduced, but oxygen delivery consistency deteriorates under fluctuating flow rates
Solution Approach 1:
The control system continuously measures the actual oxygen fraction (FdO2) delivered to the patient using a gas composition sensor and compares it with the target FdO2. Based on this feedback, the controller automatically adjusts the supplemental oxygen flow rate through a control valve to maintain the target oxygen concentration despite variations in total flow rate or patient demand.
Solution Approach 2:
The system performs self-adjustment by automatically modifying valve settings in response to measured deviations from target oxygen delivery. The controller monitors FdO2 in real-time and autonomously corrects any discrepancies without requiring manual intervention, enabling the system to maintain consistent oxygen delivery under varying conditions.
2Measurement precision
If automatic control based on real-time measurements is implemented, then oxygen delivery accuracy is improved, but device complexity increases
Solution Approach 1:
The control system continuously measures the actual oxygen fraction (FdO2) delivered to the patient using a gas composition sensor and compares it with the target FdO2. Based on this feedback, the controller automatically adjusts the supplemental oxygen flow rate through a control valve to maintain the target oxygen concentration despite variations in total flow rate or patient demand.
Solution Approach 2:
The system replaces manual mechanical adjustment of valve settings with an automated electronic control system. The controller uses electronic signals to adjust the valve based on real-time sensor measurements, substituting manual mechanical operations with automated electromechanical control to improve precision.
3Adaptability or versatility
If manual adjustments are required for changing respiratory patterns, then ease of operation is reduced, but adaptability to real-time changes is limited
Solution Approach 1:
The system performs self-adjustment by automatically modifying valve settings in response to measured deviations from target oxygen delivery. The controller monitors FdO2 in real-time and autonomously corrects any discrepancies without requiring manual intervention, enabling the system to maintain consistent oxygen delivery under varying conditions.
Solution Approach 2:
The control system continuously measures the actual oxygen fraction (FdO2) delivered to the patient using a gas composition sensor and compares it with the target FdO2. Based on this feedback, the controller automatically adjusts the supplemental oxygen flow rate through a control valve to maintain the target oxygen concentration despite variations in total flow rate or patient demand.
Data Source
Figure 1A
Figure 1B
Figure 1C~1F
AI summary
The present disclosure provides for a control system for a flow therapy apparatus. The control system can control delivery of a fraction of delivered oxygen (FdO2) to a patient. The control system can maintain the FdO2 at a target level during a therapy session. The control system can automatically control an oxygen inlet valve in order to control the flow of oxygen to the patient.