Polyaniline Ammonia Sensor Breath Sampling System
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Solution Overview
Problem
Current methods for measuring ammonia levels in patients are invasive, slow, and require laboratory analysis, necessitating a more efficient, reliable, and non-invasive approach for accurate and timely monitoring.
Innovation Solution
A system and method utilizing a conducting polymer polyaniline sensor integrated with a breath sampling device that captures and directs exhaled breath over the sensor, measuring changes in conductivity or impedance to determine ammonia concentration, with features like a membrane layer to control humidity interference and a point-of-care testing configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blood testing is used to measure ammonia levels, then measurement accuracy is improved, but invasiveness increases and analysis time increases
Solution Approach 1:
The patent uses breath as an intermediary medium to indirectly measure ammonia levels. Instead of directly testing blood, the system measures ammonia in exhaled breath which correlates with blood ammonia levels, thereby avoiding invasive blood sampling while maintaining measurement accuracy and reducing analysis time to real-time
Solution Approach 2:
The patent replaces the mechanical invasive blood sampling system with a non-invasive breath sampling system. The breath sampling device captures exhaled breath through simple respiratory effort without requiring needles, tubes, or laboratory infrastructure, thus eliminating the invasiveness and time delay associated with blood testing
2Measurement precision
If blood testing is used to measure ammonia levels, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent uses breath as an intermediary that is naturally produced by all individuals during respiration. This eliminates the need for complex blood collection procedures, skilled medical practitioners, and laboratory access, making the testing process simple, accessible, and easy to operate at any location
Solution Approach 2:
The breath sampling system requires no special preparation, skilled intervention, or external infrastructure from the subject. Individuals can provide samples simply by exhaling into the device, making the testing process self-service oriented and universally accessible without requiring medical expertise or laboratory facilities
3Reliability
If a membrane layer is added to control humidity interference, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs a thin membrane layer as a flexible barrier between the breath sample and the sensor. This membrane selectively controls humidity while allowing ammonia detection, improving measurement reliability through a simple, elegant structural addition rather than a complex system
Solution Approach 2:
The membrane layer acts as an intermediary element that mediates between the humid breath environment and the sensor. It selectively permits ammonia molecules to reach the sensor while blocking water vapor, thereby improving measurement reliability through a simple selective barrier rather than complex humidity control mechanisms
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, and non-invasive measurement of ammonia levels in breath samples, correlating with blood levels, providing rapid and reliable results suitable for point-of-care monitoring.
Implementation Method 1
measuring means for measuring change in conductivity or impedance of the sensor on exposure to ammonia in the breath sample
Implementation Method 2
measuring means for measuring change in conductivity or impedance of the sensor on exposure to ammonia in the breath sample
Implementation Method 3
The membrane layer may be of polytetrafluoroethene, or other polymer material permeable to ammonia gas and having water repellent properties
Implementation Method 4
The membrane layer may be of polytetrafluoroethene, or other polymer material permeable to ammonia gas and having water repellent properties
Data Source
AI summary
A system for sensing and measuring ammonia in a breath sample is described. The system includes a sampling means for capturing and directing a breath sample from a subject to an ammonia sensor, the ammonia sensor including a conducting polymer polyaniline sensor. The sampling means includes a breath sample capture chamber, the chamber having an inlet and outlet, the inlet having a first valve through which a breath is exhaled into the sample capture chamber, the outlet having a second valve through which breath surplus to the volume of the chamber is expelled, to provide capture of a breath sample of predefined volume.