Antimicrobial Medical Device Coating Curing

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Solution Overview

Problem

Current medical devices, such as urinary catheters and endotracheal tubes, are prone to nosocomial infections due to contamination, and existing antimicrobial coatings face issues with leaching into body fluids and staining, which can lead to systemic toxicity and cosmetic problems.

Innovation Solution

A method involving coating medical devices with an antimicrobial agent composition that includes a solvent and a basic reagent, such as chlorhexidine, combined with a dye like gentian violet, followed by curing at a temperature of at least 40°C to reduce leaching and enhance antimicrobial efficacy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If antimicrobial agents are impregnated onto medical device surfaces, then antimicrobial efficacy is improved, but leaching into body fluids increases causing systemic toxicity

Engineering Contradiction:

Improveantimicrobial efficacyVSAvoidleaching into body fluids

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by controlling the curing temperature (at least 40°C) to alter the physical-chemical state of the antimicrobial composition, enabling it to transition from a leachable state to a cross-linked, stable state that maintains antimicrobial efficacy while preventing leaching into body fluids

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining antimicrobial agents with solvents and basic reagents to form a cross-linked coating composition that integrates multiple functional components, creating a stable composite structure that provides both antimicrobial activity and resistance to leaching

Inventive Principle:

Principle #40Composite materials

2Reliability

If antimicrobial coatings are applied to medical devices, then infection prevention is improved, but staining occurs causing cosmetic problems

Engineering Contradiction:

Improveinfection preventionVSAvoidstaining

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies parameter changes by utilizing the curing temperature parameter (at least 40°C) to transform the staining properties of the coating, where the heat treatment converts potentially staining compounds into stable, non-staining cross-linked structures that maintain antimicrobial function without cosmetic defects

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful staining effect into a beneficial property by using the curing process to transform staining-prone antimicrobial compounds into stable, non-staining forms, where the initial staining risk is actually used as an indicator of proper coating application before curing converts it to a permanent non-staining state

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If existing antiseptics are used on polyurethane surfaces, then some antimicrobial activity is achieved, but durability is limited

Engineering Contradiction:

Improveantimicrobial activityVSAvoiddurability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies phase transitions by utilizing the curing process at elevated temperature (at least 40°C) to transform the antimicrobial composition from a temporary, leachable phase to a permanent, cross-linked phase, thereby extending the duration of antimicrobial activity from limited to long-lasting

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The patent applies preliminary action by performing the curing treatment during or after the coating application process, pre-stabilizing the antimicrobial coating before the device is put into service, which ensures long-term durability rather than relying on temporary surface adherence

Inventive Principle:

Principle #10Preliminary 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 method significantly decreases the leaching of antimicrobial agents into tissues, reduces staining, and provides prolonged antimicrobial activity, effectively preventing nosocomial infections on medical devices.

Implementation Method 1

curing the surface at a temperature that is at least about 40° C., wherein at least some of the solvent that was contacted with the surface is removed

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS10589003B2Methods for coating surfaces with antimicrobial agents

Publication Date: 2020.03.17 BOARD OF RGT THE UNIV OF TEXAS SYST

AI summary

Disclosed are methods for coating or impregnating a surface with an antimicrobial agent that involve contacting the surface with a composition that includes an antimicrobial agent and a solvent, and curing the surface by applying heat. Also disclosed are methods for reducing the risk of development or progression of an infection in a subject in need of a medical device, that involve coating or impregnating a surface of the medical device with an antimicrobial agent and then curing the surface by applying heat, wherein the risk of development or progression of an infection is reduced.