Implanted Analyte Sensor Indicators with Oxidation-Scavenging Additives
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Solution Overview
Problem
Implanted analyte sensors face degradation due to the immune system's attack, particularly from reactive oxygen species like hydrogen peroxide, which oxidize indicator molecules, reducing sensor longevity.
Innovation Solution
Incorporating additives such as dithio-, thio-, or mercapto-containing moieties into the analyte indicator, either as co-monomers or dispersed within a polymer graft, to neutralize or sequester degradative species without compromising signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is implanted in the body of a living animal, then the sensor can measure analytes in vivo, but the animal's immune system attacks the sensor and degrades the indicator molecules through reactive oxygen species
Solution Approach 1:
The patent introduces an intermediary substance (additive with dithio-, thio-, or mercapto-containing moieties) that mediates between the harmful reactive oxygen species and the indicator molecules. This additive acts as a sacrificial protecting agent that preferentially reacts with degradative species, preventing them from attacking the indicator molecules and thus maintaining sensor functionality throughout the implantation period
Solution Approach 2:
The patent converts the harmful effect of reactive oxygen species into a beneficial protective mechanism. By incorporating additives that have high affinity for oxidizing species, the harmful oxidative environment is transformed into a protective system where the additive sacrifices itself to neutralize degradative species, thereby protecting the indicator molecules and extending sensor life
2Measurement precision
If the sensor uses indicator molecules with boronate groups to bind glucose, then the sensor can detect analyte levels, but hydrogen peroxide oxidizes the boronate group and disables glucose binding
Solution Approach 1:
The additive serves as an intermediary that intercepts hydrogen peroxide and other reactive oxygen species before they can reach and oxidize the boronate groups of the indicator molecules. This protective intermediary maintains the chemical integrity of the boronate groups, ensuring continued glucose binding capability and measurement precision throughout the sensor's operational life
Solution Approach 2:
The patent applies beforehand cushioning by pre-incorporating protective additives into the sensor structure before implantation. These additives are positioned to provide immediate protection to the indicator molecules upon exposure to the oxidative in vivo environment, cushioning them against oxidative damage and maintaining their analytical function
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 additives significantly reduce the degradation of indicator molecules, enhancing the sensor's longevity and functionality by maintaining signal integrity.
Implementation Method 1
hydrogen peroxide may degrade the indicator molecules by oxidizing the boronate group
Implementation Method 2
one or more additives that reduce deterioration of the analyte indicator
Data Source
AI summary
A sensor (e.g., an optical sensor) that may be implanted within a living animal (e.g., a human) and may be used to measure an analyte (e.g., glucose or oxygen) in a medium (e.g., interstitial fluid, blood, or intraperitoneal fluid) within the animal. The sensor may include a sensor housing, an analyte indicator covering at least a portion of the sensor housing, and one or more compounds having dithio-, thio- or mercapto-containing moieties that reduce degradation of the analyte indicator.