Analyte Sensor Thin-Film Protection for Environment-Aware Measurement
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Solution Overview
Problem
Current blood glucose monitoring methods, such as finger-stick tests and continuous glucose monitors, are burdensome and provide limited information about intraday fluctuations, necessitating improved analyte monitoring systems that enhance patient outcomes.
Innovation Solution
An analyte monitoring system with a sensor housing containing an analyte indicator protected by a thin protective material that reduces degradation from reactive oxygen species while allowing visibility to the environment, using photodetectors to measure analyte levels and infer environmental conditions for accurate analyte level calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the analyte indicator is exposed to the environment for real-time monitoring, then measurement capability is improved, but the analyte indicator degrades due to reactive oxygen species
Solution Approach 1:
A protective material layer is introduced as an intermediary between the analyte indicator and the biological environment. This layer selectively blocks reactive oxygen species from reaching the analyte indicator while allowing analyte molecules to diffuse through for measurement, thus protecting the indicator without compromising measurement capability
Solution Approach 2:
A thin protective material film is applied over the analyte indicator. This film is sufficiently thin to allow analyte diffusion and light transmission for measurement, yet thick enough to provide catalytic protection against reactive oxygen species degradation, resolving the contradiction between exposure and protection
2Reliability
If a protective material is added to protect the analyte indicator, then indicator stability is improved, but light transmission may be blocked
Solution Approach 1:
The protective material is applied as a thin film that balances two competing requirements: it is thick enough to provide catalytic protection against reactive oxygen species, yet thin enough to allow sufficient light transmission for the analyte indicator to function. This thin film configuration resolves the contradiction between protection and light transmission
Solution Approach 2:
The thickness of the protective material is optimized to a specific parameter range that simultaneously provides adequate catalytic protection and maintains sufficient light transmission. By adjusting this critical parameter, the system achieves both indicator stability and measurement capability
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 the accuracy and longevity of analyte monitoring by reducing indicator degradation and enabling real-time environmental feedback for precise analyte level estimation.
Implementation Method 1
The protective material may be configured to reduce degradation of the analyte indicator by catalytically decomposing or inactivating one or more in vivo reactive oxygen species or biological oxidizers
Implementation Method 2
The analyte indicator may be configured to emit an amount of light indicative of an analyte level in a first medium in proximity to the analyte indicator. The light source may be in the sensor housing and may be configured to emit excitation light to analyte indicator
Implementation Method 3
The signal photodetector may be in the sensor housing and may be configured to receive light emitted by the analyte indicator and generate a measurement signal indicative of the amount of light emitted by the analyte indicator
Data Source
AI summary
An analyte monitoring system may include an analyte sensor and a transceiver. The analyte sensor may include: a sensor housing, an analyte indicator on at least a portion of the sensor housing, a protective material on at least a portion of the analyte indicator, and a light source in the sensor housing and configured to emit excitation light to analyte indicator. The transceiver may be configured to receive the sensor measurements conveyed by the analyte sensor, infer information about a condition of the environment surrounding the analyte sensor, and calculate an analyte level using at least one or more of the sensor measurements and the inferred information about the condition of the environment surrounding the sensor. The protective material may have a thickness that is thin enough to allow at least some of the excitation light to pass through the protective material and into the environment surrounding the analyte sensor.