Bactericidal Coating for Cardiac Devices Using Columnar Microstructures

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Solution Overview

Problem

Implanted cardiac devices such as pacemakers and defibrillators face a significant challenge with infection rates, particularly in 1.5% of cases, leading to high mortality rates, especially for individuals with pre-existing conditions or requiring revisional surgery, necessitating a bactericidal coating to reduce bacterial growth and biofilm formation.

Innovation Solution

A bactericidal coating comprising a substrate with a bactericidal metal element and columnar microstructure, such as Ag, Cu, or TiN, which releases ions upon exposure to bodily fluids or electrical potential, effectively reducing bacterial growth and biofilm formation without compromising the electrode's efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a bactericidal coating is applied to implanted cardiac devices, then bacterial growth and infection rates are reduced, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveinfection rateVSAvoidcoating structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The coating is divided into multiple functional layers: a base layer providing structural integrity and a top layer containing bactericidal agents. This segmentation allows each layer to perform its specific function independently, reducing overall device complexity while maintaining effective infection prevention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The coating uses composite material structures combining different materials with complementary properties - such as biocompatible polymers mixed with antimicrobial agents, or layered combinations of metal oxides and organic compounds. This approach achieves bactericidal functionality through material composition rather than complex structural design.

Inventive Principle:

Principle #40Composite materials

2Reliability

If a bactericidal coating is applied to implanted cardiac devices, then infection risks are reduced, but the manufacturing precision requirements increase

Engineering Contradiction:

Improveinfection riskVSAvoidcoating uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Surface preparation steps are performed beforehand to create optimal substrate conditions - including plasma treatment, chemical etching, or primer application - that ensure uniform coating adhesion and reduce variability during the coating process, thereby lowering precision requirements.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The coating process utilizes controlled parameter changes such as temperature gradients, pressure variations, or solvent evaporation rates to achieve uniform coating thickness and composition. By carefully managing these parameters, the system achieves consistent results without requiring extremely tight manufacturing tolerances.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If a bactericidal coating is applied to implanted cardiac devices, then bacterial growth is reduced, but the coating may compromise electrode efficiency

Engineering Contradiction:

Improvebacterial growthVSAvoidelectrode efficiency

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The coating is designed with spatially varying properties - such as porosity gradients, thickness variations, or localized antimicrobial agent distribution - that allow different regions to perform different functions. This enables the coating to provide bactericidal activity in contact with bodily fluids while maintaining electrical conductivity in regions critical for electrode performance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The coating employs porous material structures with controlled pore sizes and distributions that allow electrical signals to pass through while providing surfaces for antimicrobial agent release. The porosity enables dual functionality: electrical conductivity for electrode operation and bactericidal activity through trapped antimicrobial compounds.

Inventive Principle:

Principle #31Porous materials

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 significantly reduces proximal and distal bacterial growth, decreases infection risks, and minimizes the need for revision surgeries by providing sustained bactericidal activity without inducing antibiotic resistance or reducing electrode performance.

Implementation Method 1

releases ions upon exposure to bodily fluids or electrical potential

Methodology Applied

Scientific EffectIon release: Electrolysis

Implementation Method 2

a bactericidal layer comprising a bactericidal metal element and a columnar microstructure

Methodology Applied

Scientific EffectColumnar microstructure formation: Physical Vapour Deposition

Data Source

PatentUS20220125989A1Bactericidal coating compositions and methods using same

Publication Date: 2022.04.28 ROWAN UNIVERSITY

AI summary

The present disclosure relates in part to coating compositions comprising a bactericidal layer further comprising a bactericidal element and a columnar microstructure, which exerts bactericidal activity toward proximal and distal bacteria within an electrolyte solution (i.e. blood or other bodily fluid). The present disclosure further relates to coating compositions stably adhered to an electrode, which exerts bactericidal activity toward proximal and distal bacteria within an electrolyte solution upon application of an electric potential to the underlying electrode without a loss in efficiency of charge transfer.