Single-Layer Block Copolymer Barrier for Enzymatic In-Vivo Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrode systems for measuring analytes in vivo face challenges in manufacturing due to the tedious preparation and solubility issues of polymer mixtures used in diffusion barriers, particularly when ionic characteristics are involved, leading to workability problems and difficulties in finding suitable solvents.
Innovation Solution
A diffusion barrier comprising a block copolymer with a hydrophilic block and a hydrophobic block, covalently linked, with specific molecular ratios and glass transition temperatures, providing improved physico-chemical characteristics and ease of manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer mixtures are used to form the diffusion barrier, then the desired diffusion control and physiological compatibility can be achieved, but the preparation becomes tedious and workability problems occur due to precipitation and solubility issues
Solution Approach 1:
The patent combines multiple polymer components (hydrophilic polymer, hydrophobic polymer, and optionally ionic polymer) into a single homogeneous mixture that can be applied as one coating layer. This merging approach eliminates the need for separate application steps and avoids precipitation issues that occur when mixing polymers individually, while still achieving the desired diffusion control and physiological compatibility.
Solution Approach 2:
The diffusion barrier is formed as a composite material comprising hydrophilic and hydrophobic polymer components in specific ratios (5:95 to 40:60 weight percent). This composite structure provides both the diffusion control properties of hydrophobic polymers and the physiological compatibility of hydrophilic polymers, while the specific composition range prevents precipitation and ensures homogeneous application.
2Reliability
If ionic polymers are included in the mixture, then enhanced physiological compatibility and diffusion selectivity are achieved, but solubility problems increase making it difficult to find suitable solvents
Solution Approach 1:
The patent uses non-ionic surfactants as intermediary substances to enable the mixing of ionic and non-ionic polymers in the diffusion barrier formulation. The surfactant acts as a mediator that reduces interfacial tension and improves solubility, allowing ionic polymers to be incorporated into the hydrophilic-hydrophobic polymer mixture without causing precipitation or requiring multiple specialized solvents.
3Strength
If block copolymers with specific glass transition temperatures are used, then mechanical flexibility and sensor stability are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a range for the glass transition temperature of the hydrophobic polymer component (−50°C to 0°C) rather than a single precise value. This parameter range approach allows manufacturing flexibility while ensuring the diffusion barrier maintains appropriate mechanical properties at body temperature. The block copolymer structure inherently provides the desired flexibility within this temperature range.
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 offers excellent permeability, mechanical flexibility, and stability, allowing for small, flexible sensors with minimal sensor drift and efficient analyte transfer, suitable for both short-term and long-term in-vivo applications.
Implementation Method 1
a diffusion barrier that controls diffusion of the analyte from body fluid surrounding the electrode system to the enzyme molecules
Implementation Method 2
a block copolymer having at least one hydrophilic block and at least one hydrophobic block
Data Source
AI summary
The present disclosure relates to an electrode system for measuring the concentration of an analyte under in-vivo conditions, comprising an electrode with immobilized enzyme molecules and a diffusion barrier that controls diffusion of the analyte from body fluid surrounding the electrode system to the enzyme molecules.