Block Copolymer Diffusion Barrier for In-Vivo Sensor Accuracy
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Solution Overview
Problem
Existing electrode systems for in-vivo analyte measurement face challenges in manufacturing a diffusion barrier with desirable physico-chemical characteristics, such as permeability, mechanical flexibility, and efficient ionic group incorporation, due to the complexity of polymer mixtures and solubility issues with charged polymers.
Innovation Solution
A single block copolymer with alternating hydrophilic and hydrophobic blocks, specifically (meth)acrylate polymer blocks, is used as the diffusion barrier, providing improved permeability, mechanical flexibility, and adjustable ionic density for efficient analyte control and cell adhesion prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polymer mixtures are used for the diffusion barrier, then diverse physico-chemical characteristics can be achieved, but the preparation and application becomes tedious and problematic due to solubility issues and precipitation
Solution Approach 1:
The patent combines multiple polymer components into a single copolymer structure where hydrophilic and hydrophobic segments are covalently bonded. This merging eliminates the need to handle and mix separate polymer solutions, preventing precipitation issues while maintaining the desirable physico-chemical properties of both hydrophilic and hydrophobic characteristics in one integrated material.
Solution Approach 2:
The invention creates a composite polymer structure at the molecular level by synthesizing copolymers that contain both hydrophilic and hydrophobic segments within the same polymer chain. This molecular-level composite material provides the benefits of material combination without the manufacturing complexities of mixing macroscopic polymer solutions.
2Adaptability or versatility
If ionic polymers are incorporated into the diffusion barrier, then ionic group density can be adjusted for better analyte control, but solubility becomes difficult to manage due to charged groups affecting solvent compatibility
Solution Approach 1:
The patent merges ionic polymer segments with non-ionic polymer segments into a single copolymer molecule. The ionic groups are covalently attached to the polymer backbone along with hydrophilic and hydrophobic segments, creating a unified structure that maintains solubility while providing adjustable ionic density for controlling analyte interaction.
3Adaptability or versatility
If complex polymer mixtures are used for the diffusion barrier, then desired physico-chemical properties can be achieved, but sensor drift increases and measurement accuracy decreases over time
Solution Approach 1:
The patent merges multiple polymer functions into a single copolymer structure, creating a homogeneous and stable diffusion barrier layer. This integrated approach eliminates phase separation and structural degradation that occur in polymer mixtures, thereby maintaining consistent analyte diffusion properties and measurement accuracy over extended periods.
4Adaptability or versatility
If multiple polymers are mixed to create the diffusion barrier, then diverse properties can be achieved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the functions of multiple separate polymer applications into a single copolymer material that can be applied in one step. The copolymer structure integrates hydrophilic, hydrophobic, and ionic characteristics that would otherwise require mixing multiple polymer solutions, thereby simplifying the manufacturing process while maintaining diverse barrier properties.
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 block copolymer diffusion barrier enhances the performance of in-vivo sensors by maintaining analyte concentration measurement accuracy over short and long terms, reducing sensor drift, and minimizing tissue reaction, while being easy to manufacture and apply.
Implementation Method 1
a diffusion barrier that controls diffusion of the analyte from the exterior of the electrode system to the enzyme molecules
Implementation Method 2
the diffusion barrier comprises a block copolymer having at least one hydrophilic block and at least one hydrophobic block
Implementation Method 3
the block copolymer comprises a first block which is hydrophilic and a second block which is hydrophobic
Data Source
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AI summary
The present invention relates to an electrode system for measuring the concentration of an analyte under in-vivo conditions, comprising an electrode with immobilized enzyme molecules and an improved diffusion barrier that controls diffusion of the analyte from body fluid surrounding the electrode system to the enzyme molecules.