Graphene Oxide Plasma Coating for Implant Biofilm Prevention

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Solution Overview

Problem

Medical implants, particularly those made from Titanium alloys, face challenges with poor integration into the human body, leading to bacterial infections and biofilm formation, which existing antibacterial coatings like silver ions cannot effectively address due to toxicity and short-lived efficacy.

Innovation Solution

A stable and robust anti-microbial coating is developed by functionalizing the surface with oxygen plasma to graft oxygen-based functional groups, followed by a graphene oxide coating and an amorphous hydrocarbon film using plasma enhanced chemical vapour deposition, which is then etched to reduce surface roughness and enhance anti-biofilm effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If silver ions are used as antibacterial coating, then bacterial killing effect is achieved, but the efficacy is short-lived due to ion depletion

Engineering Contradiction:

Improveanti-bacterial efficacyVSAvoidduration of anti-bacterial effect

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent changes the mechanism of antibacterial action from chemical (silver ions) to physical (mechanical disruption by graphene oxide edges). This parameter change transforms the antibacterial mechanism from one that depletes over time to one that provides sustained protection as long as the coating structure remains intact.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the consumable silver ions (which deplete and require replenishment) with a stable, non-consumable graphene oxide coating that provides persistent antibacterial protection without depletion.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Strength

If titanium alloys are used for implants, then mechanical properties similar to bone are achieved, but poor integration with human body occurs leading to rejection

Engineering Contradiction:

Improvemechanical propertiesVSAvoidbody integration

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent creates a composite coating structure combining graphene oxide with plasma polymerized coatings. This composite approach provides both mechanical durability and biological compatibility, achieving both strength and body integration simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies different functional properties to different aspects of the coating: the graphene oxide layer provides antibacterial activity and osteo-integration promotion, while the plasma polymerized outer layer provides mechanical durability and stability. This local differentiation resolves the contradiction between mechanical strength and biological integration.

Inventive Principle:

Principle #3Local quality

3Reliability

If graphene oxide is used for antibacterial coating, then bactericidal effect is achieved, but release of GO flakes into body occurs causing dispersion issues

Engineering Contradiction:

Improveanti-bacterial activityVSAvoidflake release and body dispersion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a plasma polymerized coating as a protective shell/film that encapsulates and stabilizes the graphene oxide structure. This thin film prevents flake release while maintaining the bactericidal edges of the graphene oxide, resolving the contradiction between antibacterial activity and flake stability.

Inventive Principle:

Principle #30Flexible shells and thin films

4Reliability

If immune suppression process is used to avoid body rejection, then implant acceptance is improved, but bacterial infection risk increases

Engineering Contradiction:

Improveimplant acceptanceVSAvoidbacterial infection

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary antibacterial protection through the graphene oxide coating before implantation. This pre-established defense mechanism prevents bacterial infections without requiring post-implantation immune suppression, thereby maintaining both implant acceptance and infection prevention.

Inventive Principle:

Principle #9Preliminary anti-action

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 coating provides long-lasting anti-bacterial effects for over four weeks, suppresses bacterial proliferation, and promotes osteo-integration while being non-toxic, offering both bacteriostatic and bactericidal properties depending on plasma conditions.

Implementation Method 1

pre-treating the object with oxygen plasma to graft oxygen-based functional groups on the surface of the object

Methodology Applied

Scientific EffectPlasma: Plasma

Implementation Method 2

depositing an amorphous hydrocarbon coating on the graphene oxide coating; and treating the object to etch and flatten the coatings

Methodology Applied

Scientific EffectPlasma enhanced chemical vapour deposition: Plasma Enhanced Chemical Vapour Deposition

Implementation Method 3

treating the object to etch and flatten the coatings

Methodology Applied

Scientific EffectPlasma: Plasma

Data Source

PatentUS12208177B2Anti-microbial coating for objects such as prosthetic implants

Publication Date: 2025.01.28 NATIONAL UNIVERSITY OF IRELAND

AI summary

A method of providing an anti-microbial coating on an object, comprises the steps of pre-treating the object in a first oxygen plasma to graft oxygen-based functional groups on the surface of the object by plasma enhanced chemical vapour deposition, coating the pre-treated object with a suspension of particulate graphene oxide to provide a graphene oxide coating on the object, treating the object in a hydrocarbon plasma to deposit an amorphous hydrocarbon film on the graphene oxide coating by plasma enhanced chemical vapour deposition, and treating the object in a second oxygen plasma configured to etch and flatten the coatings on the surface of the object. A prosthetic implant having a metal or metal alloy surface and an anti-microbial coating on all or part of the surface is also described.