Conductive Polymer Film Coating for Anti-Biofouling Implants
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Solution Overview
Problem
Existing implantable medical devices face biofouling and biological adhesion issues due to contact with tissues, leading to malfunction and reduced signal sensitivity over time, particularly with conductive structures made of metals like gold and platinum.
Innovation Solution
A modified conductive structure comprising a conductive substrate with a polymer film formed through a self-assembly monolayer and polymerization, where a chemical bond exists between the polymer film and the substrate, incorporating antifouling molecules and enzyme units for enhanced biocompatibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If implantable devices are made with metal conductive structures, then conductivity and biocompatibility are improved, but biofouling and biological adhesion occur easily
Solution Approach 1:
The patent applies local quality modification by covering only the surface of the metal conductive substrate with a polymer film. The bulk metal substrate maintains its excellent conductivity and biocompatibility, while the surface layer provides anti-biofouling properties. This localized modification allows the device to exhibit different properties at different locations: the interior metal provides conductivity and the exterior polymer provides anti-adhesion.
Solution Approach 2:
The patent creates a composite material system where a metal conductive substrate is combined with a polymer anti-biofouling coating. This composite structure integrates the advantageous properties of both materials: the metal provides electrical conductivity and structural integrity, while the polymer provides resistance to biofouling and biological adhesion, solving the contradiction between conductivity and anti-biofouling ability.
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 modified conductive structure exhibits improved anti-biofouling properties, maintaining conductivity and sensitivity over long-term use, reducing protein and cell adhesion, and ensuring biocompatibility for implantable medical devices.
Implementation Method 1
forming a self-assembly monolayer on a surface of the conductive substrate using a first monomer
Implementation Method 2
the monomer composition and the self-assembly monolayer are subjected to a polymerization reaction to form a polymer film
Data Source
AI summary
A modified conductive structure includes a conductive substrate and a polymer film disposed over a surface of the polymer film. A chemical bond exists between the polymer film and the conductive substrate, and the polymer film includes repeating units as shown below:wherein A is an antifouling molecule group; B is a sulfur-containing group or a nitrogen-containing group; R is a single bond or a first linking group; C is -L-E, wherein L is a second linking group, E is an enzyme unit; x and z are each independently 0 or an integer from 1 to 10000, and y is an integer from 1 to 10000; o is 0 or an integer from 1 to 50, and when o is an integer from 1 to 50, m and n are each independently 0 or an integer from 1 to 50.