Nasal Cannula Position Detection Using Prong Electrode Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing devices for monitoring nasal cannula wear lack effective detection of improper positioning, leading to oxygen leaks and increased fire risk, especially in environments with combustible materials, and do not adequately address nasal cannula dislodgement during sleep, posing health risks for COPD patients.
Innovation Solution
A device utilizing nasal prong electrodes to measure skin resistance within nostrils, forming a voltage divider to detect proper cannula positioning, combined with a microcontroller-based system that triggers alarms or disrupts oxygen flow when improper wear is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flex sensor is used to detect nasal cannula positioning, then the device can monitor cannula wear, but the device complexity increases and battery life is limited
Solution Approach 1:
The patent replaces the mechanical flex sensor with an electrical resistance detection system. Two electrodes are positioned at the distal ends of nasal prongs, forming a resistance path through the nasal passage. When the cannula is properly positioned, the electrodes contact the nasal mucosa, creating a measurable resistance value. This electrical measurement system eliminates the need for complex mechanical flex sensors while providing reliable positioning detection.
Solution Approach 2:
The nasal passage itself serves as the sensing medium. The natural electrical properties of the nasal mucosa (moisture, conductivity) are utilized to detect cannula positioning. The system uses the patient's own physiological characteristics (skin resistance in the nasal passage) as the sensing element, eliminating the need for external sensors and reducing device complexity.
2Reliability
If oxygen flow is continuously monitored, then patient safety is improved, but oxygen leaks and fire risks increase due to improper cannula positioning
Solution Approach 1:
The system continuously monitors the resistance value between the two electrodes and compares it against predetermined thresholds. When the resistance indicates improper positioning (cannula dislodgement), the system provides feedback by triggering an alarm and automatically adjusting the oxygen flow rate. This closed-loop feedback ensures oxygen is delivered only when the cannula is properly positioned, preventing oxygen leaks and reducing fire risks from unmonitored oxygen enrichment in the environment.
3Measurement precision
If multiple sensors and actuators are used for comprehensive monitoring, then detection accuracy is improved, but the device becomes more complex and harder to operate
Solution Approach 1:
The patent extracts only the essential sensing function needed for cannula positioning detection. Instead of using multiple sensors to monitor various parameters, the system focuses solely on measuring the electrical resistance through the nasal passage. This single-parameter measurement approach maintains detection accuracy while significantly simplifying the device structure and ease of operation.
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
Enhances patient safety by reducing oxygen leaks and fire risks, ensuring proper cannula placement, and preventing dislodgement-related complications through real-time monitoring and alert systems.
Implementation Method 1
The first nasal prong electrode and the second nasal prong electrode form a second resistor having a variable resistance value that changes depending on contact between the first and second nasal prong electrodes and skin within the first and second nostrils of the user
Implementation Method 2
A voltage source is configured to introduce an input voltage across the first resistor and the second resistor
Implementation Method 3
A voltage sensing component is configured to detect an output voltage between the first resistor and the second resistor
Data Source
AI summary
A device for determining the position of a nasal cannula is disclosed. The device includes nasal prongs coupled to a connecting tube. The nasal prongs are configured to insert into the nostrils of a user. Each nasal prong has a nasal prong electrode. The nasal prong electrodes are incorporated into a voltage divider which uses the skin resistance on the nasal prongs as an element in the divider thereby acting as an indicator of proper wear of the nasal cannula. A device configured to communicate with flex sensors of a nasal cannula and nasal prong electrodes of a nasal cannula uses the data from the flex sensors or the nasal prong electrodes to determine if the nasal cannula is properly positioned. Systems including the devices and a computer system are disclosed. Methods of using the devices and systems are disclosed.