Titanium Implant Passivation for Corrosion and Bacterial Control

Solution Overview

Problem

Existing titanium-based surgical implants face issues with corrosion, bacterial adhesion, and inadequate bone integration due to non-uniform oxide layers and potential metal ion release, posing health risks and reducing effectiveness.

Innovation Solution

A passivation method involving immersion in a solution of hydrochloric acid, sulfuric acid, and hydrogen peroxide, followed by washing with alcohol, creates a stable titanium oxide layer with controlled nanoporosity and divalent cations, enhancing corrosion resistance and promoting bone integration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a natural oxide layer forms on titanium implants, then corrosion resistance is improved, but the layer is non-uniform and allows metal ion release

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies a preliminary chemical treatment (passivation) process before implantation to modify the oxide layer. The treatment involves immersion in a solution containing hydrogen peroxide and nitric acid, which pre-forms a uniform and stable oxide layer that prevents subsequent metal ion release during implantation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the chemical parameters of the oxide layer by controlling the composition and concentration of the passivation solution (hydrogen peroxide, nitric acid, and water in specific ratios). This modifies the oxide layer's stoichiometry, uniformity, and stability to eliminate harmful metal ion release while maintaining corrosion resistance.

Inventive Principle:

Principle #35Parameter changes

2Strength

If titanium implants are used for bone integration, then mechanical support is provided, but bacterial adhesion occurs on the surface

Engineering Contradiction:

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The passivation treatment is applied preliminarily to modify the surface properties of the titanium implant before implantation. This pre-treatment creates a uniform oxide layer with specific surface chemistry that prevents bacterial adhesion while preserving the implant's ability to integrate with bone tissue.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent modifies only the surface quality of the titanium implant through localized oxide layer formation. The bulk titanium material retains its mechanical properties for bone integration, while the surface oxide layer acquires antibacterial properties through controlled chemical composition and uniformity.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If complex alloys are used to replace gold, then cost-effectiveness is improved, but galvanic corrosion occurs with titanium

Engineering Contradiction:

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent converts the potential harm of metal ion release and galvanic corrosion into a benefit by using the passivation treatment to create a stable oxide layer. This layer acts as a protective barrier that prevents harmful electrochemical reactions while allowing the use of cost-effective titanium-based alloys.

Inventive Principle:

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

Solution Approach 2:

The patent creates a composite structure consisting of the titanium alloy substrate and a modified oxide layer. This composite system combines the mechanical properties and cost-effectiveness of titanium alloys with the corrosion resistance and biocompatibility of a uniformly structured oxide layer.

Inventive Principle:

Principle #40Composite 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 method significantly reduces bacterial adhesion and metal ion release, while increasing the implant's hardness and facilitating rapid osseointegration by promoting osteoblast adhesion and differentiation.

Implementation Method 1

immersing said surgical implant in a solution comprising hydrochloric acid, sulfuric acid and hydrogen peroxide

Methodology Applied

Scientific EffectChemical dissolution:

Implementation Method 2

a solution comprising hydrochloric acid, sulfuric acid and hydrogen peroxide... creates a stable titanium oxide layer

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

performing at least one wash with an alcohol

Methodology Applied

Scientific EffectSolvent cleaning:

Data Source

PatentUS20250222163A1Method for the passivation of surgical implants comprising titanium, and surgical implant obtained

Publication Date: 2025.07.10

AI summary

The present invention discloses a method for the passivation treatment of a surgical implant comprising titanium, characterized in that it comprises the steps of: a) immersing said surgical implant in a solution comprising hydrochloric acid, sulfuric acid and hydrogen peroxide; b) performing at least two washes with an aqueous solution; and c) performing at least one wash with ethanol. In addition, the present invention discloses a surgical implant comprising titanium with bactericidal capacity, characterized in that it comprises a surface layer of titanium oxide with a nanoporosity of between 90 nm and 200 nm.