Phosphorus-Free Acid Composition for Instrument Reprocessing

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Solution Overview

Problem

Existing cleaning compositions for health care instruments fail to effectively remove scale deposits and rust stains while preserving the passive layer of metal surfaces, leading to corrosion and reduced lifespan, and are often phosphorus-based, which are environmentally undesirable.

Innovation Solution

A phosphorus-free acid-based composition comprising citric acid, a nonionic surfactant, and water, which effectively removes scale deposits and rust stains while maintaining the passive layer of metal surfaces, as demonstrated by achieving a pass rating under ASTM A380/A380M-17 and ASTM A967/A967M-17 standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phosphorus-based cleaning compositions are used to remove scale deposits and rust stains, then cleaning effectiveness is improved, but environmental harm increases due to phosphorus pollution

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidenvironmental harm

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by replacing phosphorus-based cleaners with acid-based compositions (pH 2-6). The acid-based formula contains citric acid, hydrochloric acid, and other acids that effectively remove scale and rust without phosphorus, thus eliminating environmental harm while maintaining cleaning effectiveness through different chemical mechanisms

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a disposable, single-use acid-based cleaning composition that is biodegradable and environmentally friendly. The composition is designed to be used once and disposed of, eliminating the need for persistent phosphorus-based chemicals in the environment, thereby solving the environmental harm issue while providing effective cleaning

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If harsh cleaning conditions are applied to remove contaminants, then cleaning effectiveness is improved, but instrument lifespan decreases due to corrosion and surface damage

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidinstrument lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical parameters by using acid-based compositions with controlled pH (2-6) that are effective at removing contaminants while being less damaging to metal surfaces. The acid-based formula selectively removes scale and rust without the excessive harshness of traditional phosphorus-based cleaners, thus extending instrument lifespan while maintaining cleaning effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potentially harmful effect of acids into a beneficial process. The acid-based composition is designed to dissolve scale deposits and rust stains through controlled chemical reactions, transforming what could be considered a harsh cleaning method into a protective treatment that actually preserves metal surfaces by removing corrosive deposits without damaging the underlying instrument material

Inventive Principle:

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

3Reliability

If repeated instrument reprocessing cycles are performed, then infection control is improved, but surface integrity deteriorates due to wear and corrosion

Engineering Contradiction:

Improveinfection controlVSAvoidsurface integrity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent provides a continuous solution for repeated reprocessing cycles by using an acid-based composition that maintains surface integrity throughout multiple uses. The composition is designed to be applied consistently in each reprocessing cycle, providing continuous protection and cleaning without degrading surface integrity, thereby enabling sustained infection control while preserving surface integrity across multiple cycles

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The patent applies protective acid-based treatment before the harmful effects of repeated cleaning cycles can damage the instrument surfaces. The acid-based composition pre-treats and protects the surfaces by removing corrosive deposits and creating a protective layer, cushioning against the wear and corrosion that would otherwise occur during repeated reprocessing cycles

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 composition prolongs the lifespan of health care instruments by effectively removing scale deposits and rust stains without discoloration, while preserving the passive layer, thus enhancing their durability and functionality.

Implementation Method 1

The compositions can include chelating agents, which may assist in the removal of scale deposits and rust stains from metal surfaces

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

at least one acid... effectively removes scale deposits and rust stains

Methodology Applied

Scientific EffectChemical dissolution:

Implementation Method 3

providing passivation on metal surfaces... maintaining the passive layer of metal surfaces

Methodology Applied

Scientific EffectPassivation:

Implementation Method 4

The passive layer of a metal surface is a thin semiconducting oxide film that forms on the surface when it comes into contact with oxygen

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 5

an alkoxylated nonionic surfactant... nonionic surfactant

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentUS20250304881A1Neutralizing instrument reprocessing

Publication Date: 2025.10.02 ECOLAB USA INC

AI summary

A neutralizer, destainer/descaling, and passivating composition and methods of using the same on metal surfaces are disclosed. The compositions are particularly well suited for the treatment of health care surfaces and other hard surfaces in need of treatment. In particular, the neutralizer, destainer/descaling, and passivating composition is an acid-based composition for use in instrument reprocessing.