Vehicle Oxygen Supply Monitoring for Hypocapnia Warning
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Solution Overview
Problem
Existing solutions for detecting and preventing physiological deficits such as hypoxia and hypocapnia in military aircraft pilots are inadequate, particularly due to the difficulty in implementing carbon dioxide sensors and the inability to effectively prevent hypocapnia.
Innovation Solution
An apparatus with sensors measuring respiratory gas pressure and/or flow, coupled with an electronic data storage and processing unit, calculates respiratory frequency and generates audible, visual, or vibratory warnings when the frequency exceeds a threshold, aiding in the prevention of hypocapnia by informing the user and potentially adjusting their breathing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a carbon dioxide sensor is provided to measure CO2 content in exhaled gases, then the ability to detect hypocapnia is improved, but the device complexity and difficulty of implementation increase significantly
Solution Approach 1:
The patent uses an intermediary approach by measuring respiratory frequency through pressure or flow sensors as a proxy indicator for hypocapnia detection, rather than directly measuring CO2 content. This intermediary measurement method avoids the complexity of CO2 sensors while still providing effective detection capability.
Solution Approach 2:
The patent replaces the chemical sensing mechanism (CO2 sensor) with a mechanical measurement approach using pressure sensors or flow sensors to detect respiratory frequency. This substitution simplifies the device while maintaining detection effectiveness through indirect measurement.
2Reliability
If respiratory frequency monitoring is implemented to detect hypocapnia, then the ability to prevent hypocapnia is improved, but the device complexity increases due to electronic data processing requirements
Solution Approach 1:
The system performs self-service by automatically monitoring respiratory frequency, comparing it against threshold values, and generating warnings without requiring complex external processing systems. The microprocessor unit handles data acquisition, analysis, and warning generation in an integrated self-contained manner.
Solution Approach 2:
The patent implements feedback by continuously monitoring respiratory frequency and providing real-time warnings when abnormal patterns are detected. The system compares measured frequency against predetermined thresholds and provides immediate feedback through visual or audible alerts to help users correct their breathing.
3Measurement precision
If multiple sensors and electronic processing units are added to monitor respiratory parameters, then the measurement precision and reliability improve, but the ease of operation and device simplicity deteriorate
Solution Approach 1:
The system automatically performs all measurement, analysis, and warning functions without requiring user intervention or complex operation. The microprocessor unit autonomously acquires sensor data, processes it, and generates warnings, making the device simple to operate despite its sophisticated internal functionality.
Data Source
AI summary
Apparatus for supplying oxygen to a vehicle user, comprising a source of pressurized respiratory gas containing oxygen-enriched air, a flow-regulating and/or pressure-regulating unit, and at least one mask provided for supplying gas to the respiratory tract of said user, the regulating unit comprising at least one inlet connected to the source and at least one outlet connected to the mask, the regulating unit being configured to regulate the flow and/or the pressure of the respiratory gas supplied to the mask according to the respiratory demand of the user, the apparatus comprising at least one sensor measuring the pressure and/or the flow of respiratory gas delivered by the regulating unit to the mask, and an electronic data storage and processing unit configured to receive the measurements from the at least one sensor and to calculate, from these measurements, the frequency of the gas flows supplied to the mask and corresponding to the respiratory frequency of the user, to compare this calculated frequency against a threshold frequency and, when this calculated frequency is greater than the threshold frequency, to generate an audible and/or visual and/or vibratory warning signal.