Forehead Pulse Oximetry Sensor for Hypoxia Monitoring
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Solution Overview
Problem
Pilots in high-altitude flights face undetected oxygen deprivation and hypoxia due to lack of reliable and accurate in-flight monitoring of arterial oxygen saturation, pulse rate, and carboxyhemoglobin levels, leading to unexplained physiologic incidents and increased hypoxia-related incidents despite additional life support systems.
Innovation Solution
A non-invasive method using an infrared photometric technique with a pulse oximetry reflectance sensor installed in headgear to monitor arterial oxygen saturation, pulse rate, and carboxyhemoglobin levels, combining indices of altitude, vibration, and gravitational forces to calculate a weighted confidence index for accurate measurements, with an early warning alarm activated when oxygen levels drop below a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional life support systems are installed in aircraft, then pilot safety should improve, but hypoxia-related incidents continue to increase due to lack of reliable monitoring
Solution Approach 1:
The patent implements continuous monitoring of arterial oxygen saturation, pulse rate, and carboxyhemoglobin levels with real-time feedback to pilots and ground personnel. This closed-loop feedback system detects hypoxia conditions promptly and enables timely intervention, directly addressing the information loss problem while enhancing overall system reliability
Solution Approach 2:
The patent introduces an intermediary monitoring system that acts as a bridge between the pilot's physiological state and the life support systems. The pulse oximetry sensor and associated electronics serve as intermediaries to detect and report physiological parameters, enabling the life support system to respond appropriately without requiring direct pilot intervention
2Ease of operation
If pulse oximetry sensor is used for monitoring, then non-invasive measurement is achieved, but measurement accuracy deteriorates under high-G maneuvers and vibration conditions
Solution Approach 1:
The patent changes the measurement parameters by introducing confidence indices (CI) that dynamically adjust based on detected vibration levels, G-forces, and signal quality. This allows the system to maintain non-invasive monitoring while compensating for accuracy degradation through parameter-based correction factors
Solution Approach 2:
The patent makes the monitoring system dynamic by continuously adjusting measurement confidence levels based on real-time detection of vibration, gravitational forces, and signal quality. The system adapts its operation mode according to flight conditions, maintaining accuracy through dynamic parameter adjustment rather than static measurement protocols
3Reliability
If monitoring system is made more complex to improve accuracy, then measurement reliability improves, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by using a single integrated monitoring system that simultaneously measures arterial oxygen saturation, pulse rate, and carboxyhemoglobin levels. The same sensor and processing unit handle multiple physiological parameters and multiple environmental conditions (vibration, G-forces, altitude), reducing overall system complexity while maintaining high measurement reliability
Solution Approach 2:
The patent combines multiple monitoring functions into a unified system. The pulse oximetry sensor, vibration sensor, accelerometer, and processing unit are merged into an integrated apparatus that performs physiological monitoring, environmental sensing, and confidence index calculation in a single cohesive system, thereby improving reliability without proportionally increasing complexity
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
Enables real-time, accurate monitoring and alerting of hypoxia symptoms in pilots, improving safety by providing reliable data and timely warnings during in-flight conditions, reducing the risk of fatal hypoxia incidents.
Implementation Method 1
detection of an artery microcirculation of blood in forehead of the aircraft pilot by using an infrared (IR) photometric technique
Implementation Method 2
A pulse oximetry (PO) reflectance sensor is installed over the detected artery with microcirculation in the forehead
Data Source
AI summary
The various embodiments herein disclose a method for monitoring non-invasive arterial oxygen saturation (SpO2), pulse rate (PR) and detecting level of carboxyhaemoglobin (COHb) in a blood flow of an aircraft pilot during an in-flight condition for detection of symptoms of hypoxia. The method comprises detection of an artery microcirculation of blood in forehead of the aircraft pilot by using an infrared (IR) photometric technique. A pulse oximetry (PO) reflectance sensor is installed over the detected artery with microcirculation in the forehead. The values of AI, VI and GI are combined with a signal strength and a signal quality of the PO sensor to calculate a final weighted index of confidence for SpO2 (CIsat) and PR (CIpr) measurements. The measured values of CIsat and CIpr are implemented to calculate an overall weighted confidence index (CI) to determines an accuracy of measurements of SpO2 and PR.