Variable Flow Oxygen Delivery System for Aircraft Passenger Safety
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Solution Overview
Problem
Emergency oxygen supply systems on aircraft are inefficient, leading to the need for larger oxygen storage and generation, which increases weight and affects payload capacity and fuel consumption, as they deliver oxygen at a constant rate assuming worst-case scenarios without accounting for individual passenger oxygen consumption efficiency.
Innovation Solution
A system that uses a pulse oximeter to measure a passenger's blood oxygen saturation levels and adjusts oxygen flow accordingly, delivering a variable dosage based on real-time measurements to optimize oxygen usage, ensuring efficient delivery and extending the system's usage time or reducing storage needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen is delivered at a constant rate based on worst-case scenarios, then all passengers are guaranteed sufficient oxygen supply, but the oxygen storage capacity must be larger and the system weight increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant flow system to a dynamic variable flow system. The oxygen delivery rate is continuously adjusted based on real-time monitoring of passenger oxygen saturation levels, respiratory rate, and breathing pattern. This allows the system to adapt to actual physiological needs rather than relying on fixed worst-case assumptions, thereby reducing the total oxygen storage capacity required while maintaining adequate supply reliability.
Solution Approach 2:
The patent implements feedback control by using sensors to continuously monitor passenger oxygen saturation (SpO2), respiratory rate, and breathing patterns. These measurements are fed back to a control algorithm that adjusts the oxygen delivery rate in real-time. This closed-loop feedback mechanism ensures reliable oxygen supply while optimizing consumption, allowing for reduced storage capacity compared to open-loop constant flow systems.
2Reliability
If oxygen is delivered at a constant rate to accommodate worst-case scenarios, then safety margin is maintained, but the oxygen storage capacity and system complexity increase
Solution Approach 1:
The patent employs feedback control through continuous monitoring of oxygen saturation, respiratory rate, and breathing patterns. Sensors provide real-time data to a control algorithm that adjusts oxygen delivery accordingly. This feedback mechanism maintains safety margins by detecting when additional oxygen is needed while avoiding unnecessary oxygen delivery, thereby reducing overall system complexity compared to conservative constant-flow designs.
Solution Approach 2:
The system applies self-service principles by autonomously monitoring passenger physiological parameters and automatically adjusting oxygen delivery without requiring manual intervention. The control algorithm processes sensor data and modulates oxygen flow based on actual needs, reducing the complexity of manual control systems while maintaining or improving safety margins.
3Productivity
If oxygen delivery is adjusted based on individual passenger needs, then oxygen efficiency improves and usage time extends, but the device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The patent applies universality by designing a multi-functional integrated system where a single control unit performs multiple functions: monitoring oxygen saturation, measuring respiratory rate, analyzing breathing patterns, and controlling oxygen delivery. This consolidation of multiple functions into one system reduces the overall device complexity compared to having separate systems for each function, while still achieving improved oxygen efficiency through individualized delivery.
Solution Approach 2:
The feedback mechanism in the patent enables efficient oxygen delivery by continuously monitoring physiological parameters and adjusting flow rates accordingly. The control algorithm processes feedback from sensors and modulates oxygen delivery to match actual passenger needs, significantly improving oxygen usage efficiency. The complexity added by feedback sensors is offset by the elimination of excessive oxygen storage capacity that would be required in non-feedback systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances oxygen efficiency by tailoring oxygen delivery to individual needs, potentially doubling the system's usage time or reducing storage requirements, thereby reducing weight and improving safety margins without downsizing the system.
Implementation Method 1
uses a pulse oximeter to measure a passenger's blood oxygen saturation levels
Data Source
Figure 1A
Figure 1B~2
Figure 3
AI summary
A system and method for delivering oxygen to a passenger of an aircraft including a supply of oxygen, an oral-nasal mask, a controller for adjusting a flow of oxygen from the supply of oxygen to the oral-nasal mask, and a sensor for determining a user's blood oxygen saturation level, wherein the controller adjusts the flow of oxygen based on the sensor's determination of the user's blood oxygen saturation level.