Monolithic pH Electrodes for Intraesophageal Measurement
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Solution Overview
Problem
Current methods for diagnosing gastroesophageal reflux disease (GERD) face challenges in accurately measuring rapid changes in intraesophageal pH within the normal range, making it difficult to distinguish between GERD and coronary artery disease, and existing sensing electrodes are not adequately effective for precise pH measurement in the esophagus.
Innovation Solution
Development of monolithic sensing electrodes with a substrate, a walled cavity, an electrically conductive cathode layer, a silver chloride layer, an electrically conductive contact pad, and a porous membrane layer, which form a transducer capable of accurately measuring pH levels within the esophagus, including the use of silver and silver chloride layers for improved conductivity and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensing electrodes are used to measure intraesophageal pH, then the measurement can be performed, but the measurement precision is insufficient to accurately detect rapid pH changes within the normal range (pH 4-7)
Solution Approach 1:
The electrode is divided into functionally distinct layers: a substrate providing structural support, a cathode layer for electron transfer, a silver chloride layer for stable reference potential, and a porous membrane layer for selective ion transport. This segmentation allows each layer to be optimized for its specific function, thereby improving overall measurement precision and diagnostic reliability.
Solution Approach 2:
The electrode employs a composite structure combining multiple materials with complementary properties: conductive materials for electron transfer, silver chloride for reference potential stability, and porous membrane materials for selective permeability. This composite approach enables simultaneous achievement of electrical conductivity, chemical stability, and selective ion detection, resolving the contradiction between measurement precision and diagnostic reliability.
2Measurement precision
If a complex multi-layer electrode structure is implemented to improve pH measurement accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
Multiple functional layers (cathode, silver chloride, porous membrane) are merged into a single integrated electrode assembly mounted on a common substrate. This merging consolidates what could be separate components into one unified device, improving measurement precision while minimizing the increase in device complexity through functional integration.
Solution Approach 2:
The substrate serves multiple functions simultaneously: providing mechanical support for all layers, establishing electrical connections, and serving as the mounting platform for the entire sensing assembly. This multi-functionality reduces the need for additional structural components, thereby improving measurement precision without proportionally increasing device complexity.
3Measurement precision
If rapid pH changes are measured to diagnose GERD, then diagnostic accuracy improves, but the difficulty of detecting and measuring increases due to the rapidity and small magnitude of pH changes
Solution Approach 1:
The porous membrane layer provides high surface area for ion exchange while maintaining selective permeability to hydrogen ions. This porous structure enhances the electrode's response speed to rapid pH changes by increasing the active detection surface area, thereby improving rapid pH change detection capability while managing the inherent difficulty through material architecture rather than complex measurement systems.
Solution Approach 2:
The electrode utilizes changes in electrical potential parameters in response to hydrogen ion concentration changes. By monitoring potential differences across the silver chloride and porous membrane layers, the system detects rapid pH changes through electrical parameter variations, which are easier to measure rapidly than direct chemical concentration changes, thus reducing detection difficulty while maintaining high measurement precision.
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
The monolithic electrodes enable precise measurement of intraesophageal pH, enhancing diagnostic accuracy for GERD by distinguishing between acidic and basic conditions, thereby improving the differentiation from coronary artery disease symptoms.
Implementation Method 1
an indicator electrode (also known as a working or measurement electrode) selectively measures a specific chemical species, such as an ion... When electrical potentials are measured by an indicator electrode, the method is termed potentiometry
Implementation Method 2
a porous membrane layer overlaying the cavity and defining a chamber formed by the porous membrane layer
Data Source
AI summary
The disclosure provides monolithic electrodes including a substrate defining a walled cavity having a floor, an electrically conductive cathode layer overlaying the cavity floor, an electrically conductive contact pad overlaying the substrate, an electrically conductive via in electrical communication with the cathode layer and the contact pad, and a porous membrane layer overlaying the cavity and defining a chamber formed by the porous membrane layer, the walled cavity, and the cavity floor. The disclosure also provides pH transducers including monolithic indicator and reference electrodes, and methods of making and using monolithic pH electrodes and transducers.