Catheter Coating with Polyiodide Resin for Sustained Antimicrobial Release

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Solution Overview

Problem

Current antimicrobial catheters face issues with limited antibacterial effectiveness, rapid loss of antimicrobial activity due to leaching, and the development of bacterial resistance, particularly with silver and antibiotic coatings, which are not effectively controlled or sustained.

Innovation Solution

A catheter coating process using a thermoset uncross-linked polymer with iodine complexed or matrixed in a polyiodide resin, providing a thin outer layer for controlled release of iodine, which is highly effective against a broad spectrum of pathogens without leaching and resistant to resistance development.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If drug-based coatings such as ionic silver, chlorhexidine and antibiotics are used, then some degree of protection against dangerous microbes is provided, but the antibacterial effectiveness is limited and bacterial resistance develops

Engineering Contradiction:

Improveantimicrobial effectivenessVSAvoidbroad spectrum activity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical parameter from drug-based agents (silver, antibiotics) to iodine-based polymeric dispersion. Iodine provides broad-spectrum antimicrobial activity against bacteria, fungi, viruses and spores, resolving the limitation of narrow-spectrum drug-based coatings while preventing resistance development through a different mechanism of action.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material system consisting of iodine complexed with a polymeric dispersion (such as polyvinylpyrrolidone or povidone). This composite provides controlled release of iodine while maintaining broad-spectrum antimicrobial effectiveness, overcoming the limitations of both single-agent drug coatings and simple iodine applications.

Inventive Principle:

Principle #40Composite materials

2Reliability

If iodine is combined with a solubilizing agent or carrier to form an iodophor, then the effectiveness of iodine is increased, but the iodine may leach from the surface of the elastomeric product over time

Engineering Contradiction:

Improveantimicrobial effectivenessVSAvoidduration of antimicrobial activity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies a thin film coating of polymeric dispersion containing complexed iodine onto the elastomeric catheter surface. This thin film acts as a controlled release matrix that prevents rapid leaching while maintaining antimicrobial effectiveness, resolving the contradiction between initial potency and long-term durability.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The polymeric dispersion (such as polyvinylpyrrolidone or povidone) serves as an intermediary carrier that complexes with iodine to form an iodophor within the coating matrix. This intermediary provides controlled release kinetics, preventing rapid leaching while maintaining sustained antimicrobial activity throughout the catheter's service life.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If a coating is applied to provide controlled release of iodine, then the amount of iodine required is reduced, but the coating must maintain efficacy beyond 96 hours

Engineering Contradiction:

Improveamount of iodineVSAvoidduration of antimicrobial activity

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The patent creates a continuous controlled release system where the polymeric dispersion coating gradually releases iodine over time. This continuous action maintains therapeutic levels of free iodine at the catheter surface for extended periods (beyond 96 hours), achieving both reduced total iodine用量 and prolonged efficacy through sustained release kinetics.

Inventive Principle:

Principle #20Continuity of useful 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 polyiodide resin coating achieves a significant reduction in microbial growth, exceeding FDA requirements with a 4-log kill and maintaining efficacy beyond 96 hours, while using a minimal amount of iodine, thus reducing toxicity and manufacturing costs.

Implementation Method 1

When iodine reacts with aqueous solutions, free iodine, which provides the germicidal effect, is released.

Methodology Applied

Scientific EffectGermicidal effect:

Implementation Method 2

A catheter coating process using a thermoset uncross-linked polymer with iodine complexed or matrixed in a polyiodide resin, providing a thin outer layer for controlled release of iodine

Methodology Applied

Scientific EffectControlled release: Diffusion

Data Source

PatentUS10709819B2Method for coating catheters with a layer of antimicrobial agent

Publication Date: 2020.07.14 VALENCIDE

AI summary

Disclosed is a catheter with an antimicrobial coating that reduces the development of device-associated urinary tract, respiratory and bloodstream infections and methods for making the same. The disclosed method comprises the layered application of one or more organic solutions to a coatable elastomeric product which results in a device that allows for a controlled time release of iodine therefrom. Application of one or more antitoxic agents in multiple layers and locations on the desired elastomeric product helps to tailor delivery and potency of the antimicrobial coating.