Body-Mountable Urea Sensor with Embedded Electrochemical Detection
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Solution Overview
Problem
Current electrochemical potentiometric sensors for measuring urea concentrations in bodily fluids, such as tear films, are limited in their ability to provide real-time, non-invasive, and continuous monitoring, often requiring invasive blood sampling and lacking in portable and user-friendly designs.
Innovation Solution
A body-mountable device featuring a polymeric substrate with an embedded electrochemical sensor system, including a working electrode sensitive to urea, a reference electrode, and a radio-frequency antenna, which measures potentiometric voltage and wirelessly communicates the data to an external reader, allowing for real-time urea concentration monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrochemical potentiometric sensors are used for urea measurement, then measurement precision can be achieved, but the device requires invasive blood sampling and lacks portability
Solution Approach 1:
The patent introduces an intermediary substance (urea permeable membrane or urea transport protein) that allows urea to pass from the bodily fluid through the polymeric matrix to the sensor surface. This intermediary enables non-invasive measurement by mediating the transport of urea from the external environment to the electrochemical sensor, eliminating the need for invasive blood sampling while maintaining measurement precision
Solution Approach 2:
The patent replaces the mechanical/invasive blood sampling system with an electrochemical sensing system that uses potentiometric measurement. Instead of physically collecting blood samples through puncture or draw, the system uses an electrochemical sensor that measures voltage differences generated by urea concentration, substituting mechanical intrusion with electrical measurement
2Productivity
If continuous real-time monitoring is implemented, then productivity of monitoring is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by integrating multiple capabilities into a single polymeric matrix structure: the matrix serves as both the structural housing and the urea transport medium, the electrochemical sensor provides both detection and signal generation, and the wireless interface combines data transmission with power management. This universal design enables continuous monitoring without proportionally increasing overall system complexity
Solution Approach 2:
The patent merges previously separate components into an integrated system: the polymeric matrix encapsulates both the urea transport function and the electrochemical sensor, the wireless interface combines power harvesting and data communication functions, and the entire assembly is mounted as a single unit on the body. This merging reduces the number of separate components and simplifies the overall system architecture while enabling continuous monitoring
3Ease of operation
If body-mountable wireless device is created, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the device into distinct functional modules: the polymeric matrix module containing the urea transport mechanism, the electrochemical sensor module with working and reference electrodes, the wireless interface module with antenna and power management, and the mounting module. This segmentation allows each module to be manufactured and tested separately with appropriate precision requirements, then assembled into the final body-mountable device, reducing the overall manufacturing precision burden
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 continuous, non-invasive, and real-time measurement of urea concentrations in bodily fluids, providing a more convenient and effective alternative to traditional blood sampling methods.
Implementation Method 1
Electrochemical potentiometric sensors measure concentrations of an analyte by measuring voltage differences that develop between two or more electrodes exposed to a solution containing one or more analytes
Implementation Method 2
an antenna disposed on the substrate... use the antenna to indicate the measured potentiometric voltage
Data Source
AI summary
A body-mountable urea sensing device includes an electrochemical sensor embedded in a polymeric material configured for mounting to a surface of an eye. The electrochemical sensor includes a working electrode, a reference electrode, and a reagent localized near the working electrode that selectively reacts with urea. A potentiometric voltage between the working electrode and the reference electrode is related to a concentration of urea in a fluid to which the electrochemical sensor is exposed; the voltage is measured by the body-mountable device and wirelessly communicated.