Titanium Implant Surface Coating via Electrochemical Immersion
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Solution Overview
Problem
Current surface coatings for titanium and titanium-based implants used in osteosynthesis are not adequately degradation-resistant and lack optimal surface roughness, leading to complications such as metal removal, implant dislocation, and tissue reactions due to poor adhesion and porosity, which can result in fracture healing disorders and bacterial infections.
Innovation Solution
An electrochemical immersion process followed by a blasting treatment is used to create a porous and plastically deformable surface coating with adjustable properties, including bioactivity and degradation stability, which enhances adhesion and resistance to solvation, diffusion, and thermal stress, allowing for controlled colonization by osteoblasts and resistance to bacterial inflammation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrochemical immersion is used to produce surface coating, then degradation resistance is improved, but surface roughness becomes insufficient
Solution Approach 1:
The patent combines two previously separate processes into a single integrated electrochemical immersion method that simultaneously achieves both degradation resistance and optimal surface roughness. The coating is formed through electrochemical deposition from an aqueous electrolyte containing calcium and phosphate ions, creating a porous structure with appropriate roughness in one step rather than requiring sequential processes.
Solution Approach 2:
The patent optimizes specific parameters of the electrochemical immersion process including electrolyte composition (calcium phosphate concentration ratios), electrical parameters (current density, pulse duration), and process conditions (temperature, pH) to simultaneously achieve the desired degradation resistance and surface roughness characteristics that match natural bone.
2Adaptability or versatility
If porosity is increased to promote bone growth, then bioactivity is improved, but adhesion strength decreases
Solution Approach 1:
The patent creates a surface coating with spatially varying properties where the porous structure is optimized for bone ingrowth in specific regions while maintaining sufficient adhesion strength at the coating-substrate interface. The coating composition and pore structure are tailored to provide different local functions: strong bonding at the interface and high porosity at the outer surface for osteoblast colonization.
3Stability of the object's composition
If alloying components are allowed to diffuse through layers, then material properties are maintained, but tissue reactions occur
Solution Approach 1:
The patent converts the potentially harmful diffusion of alloying components into a beneficial process by controlling the electrochemical deposition to create a coating that selectively releases beneficial ions (calcium, phosphate) while restraining harmful alloying elements. The controlled ion release promotes bone growth while the coating structure prevents harmful components from reaching surrounding tissues.
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 resulting surface coating provides extended degradation resistance and adhesive strength, enabling safe implant removal after healing while promoting bone integration and reducing bacterial colonization, thus addressing the high complication rate in open fractures.
Implementation Method 1
the electrochemical variant of generating biocompatible layers is the alternative of choice
Implementation Method 2
An electrochemical immersion process is used to produce a porous and plastically deformable surface coating with adjustable properties
Implementation Method 3
a coordinated post-treatment with blasting processes. The surface coating according to the invention has the property that it is characterized by extensive stability against solvation, diffusion and decomposition processes
Data Source
AI summary
The invention relates to an electrochemical immersion method in an aqueous electrolyte for producing a biologically degradation-stable surface layer on base bodies made of titanium or titanium based alloys with anodic polarity of the base body. According to the invention, the electrolyte is formed as an aqueous solution from the components 0,05 - 0,5 mol/l calcium disodium ethylene diamine tetraacetic acid (C10H12N2O8CaNa2), 0.05 - 0.5 mol/l ammonium dihydrogen phosphate (NH4H2PO4), 0.5 - 5.0 mol/l hydrogen peroxide (H2O2) and 0.003 - 0.03 mol/l pyridine-2.6-dicarboxylic acid (C7H5O4N).