Graft Polymer Coating for Implantable Electrode Anti-Adhesion
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Solution Overview
Problem
Implantable spinal cord stimulation electrodes face issues with protein deposition and adhesion, leading to increased resistance and reduced effectiveness over time, and current surface treatments for metal electrodes are non-uniform and costly, especially for complex shapes.
Innovation Solution
A graft polymer is developed, comprising a polymer backbone with hydroxy groups, protection group modified histidine, and a hydrophilic polymer with a terminal reactive group, which is adsorbed onto the metal surface, creating a composite material that reduces adhesion and maintains effectiveness even when immersed in bodily fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface treatment (plasma, ozone, corona) is applied to metal electrode, then adhesion resistance is improved, but manufacturing cost increases and thickness uniformity deteriorates
Solution Approach 1:
The patent introduces a graft polymer as an intermediary substance between the metal electrode surface and the biological environment. This polymer, containing histidine residues that bind to metal surfaces and hydrophilic side chains that resist protein adhesion, serves as a mediating layer that provides anti-adhesion functionality without requiring complex surface treatments like plasma or ozone processing
Solution Approach 2:
The invention creates a composite material system consisting of a metal electrode substrate coated with a grafted polymer layer. This composite structure combines the electrical conductivity of metal with the anti-adhesion properties of the hydrophilic polymer, achieving both electrical functionality and resistance to protein deposition
2Reliability
If surface treatment (plasma, ozone, corona) is applied to metal electrode, then adhesion resistance is improved, but coating uniformity deteriorates
Solution Approach 1:
The graft polymer acts as an intermediary that uniformly covers the metal surface through chemical grafting. The polymer chains extend from the metal surface into the surrounding environment, creating a consistent anti-adhesion barrier that maintains uniformity even on complex electrode geometries, unlike plasma or ozone treatments that struggle with uniform coverage
Solution Approach 2:
The invention changes the chemical parameters of the electrode surface by grafting polymer chains onto the metal. This chemical modification approach, rather than physical surface treatment, allows for better control of coating uniformity through chemical reaction mechanisms that can evenly distribute polymer chains across the surface
3Object-generated harmful factors
If electrode is removed and re-implanted to clear protein adhesion, then adhesion problem is resolved, but patient suffering increases and treatment duration extends
Solution Approach 1:
The graft polymer provides preliminary anti-action by pre-establishing an anti-adhesion barrier on the electrode surface before implantation. The hydrophilic polymer chains create a protective layer that prevents protein adhesion from occurring in the first place, rather than requiring subsequent removal procedures
Solution Approach 2:
The invention converts the harmful interaction between the electrode surface and proteins into a beneficial relationship by using the polymer layer to prevent direct contact. The hydrophilic nature of the grafted polymer creates a barrier that repels proteins, turning the surface from a protein-attracting interface to a protein-repelling interface
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 graft polymer effectively reduces protein adhesion and maintains stability on metal surfaces, preventing peeling and resistance increase, thus extending the lifespan and efficacy of implantable electrodes.
Implementation Method 1
the graft polymer is adsorbed to the surface of the metal material by the protection group modified histidine
Data Source
AI summary
A graft polymer is provided, which includes a polymer backbone with a plurality of hydroxy groups, protection group modified histidine grafted onto the side of the polymer backbone, and hydrophilic polymer having terminal reactive group grafted onto the side of the polymer backbone. The graft polymer coating can be applied to metal material to form a composite material, which can be implanted into an organism to reduce adhesion problems.