Titanium Dioxide Scaffold Recoating for Bone Strength
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Solution Overview
Problem
Current bone scaffolds face limitations in mechanical strength while maintaining the necessary pore architecture, which restricts their use in orthopedic applications due to compromised structural integrity and high material and processing costs associated with advanced techniques like chemical vapor deposition.
Innovation Solution
A method for producing titanium dioxide scaffolds through a recoating procedure involving multiple sintering steps and vacuum infiltration, which enhances mechanical strength without compromising pore architecture, using a process that includes applying a titanium dioxide slurry, solidifying, and subjecting the scaffold to high-temperature sintering, followed by optional double-coating and centrifugation to improve strut uniformity and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional scaffold materials and structures are used to maintain pore architecture for cell growth, then bone regeneration capability is improved, but mechanical strength is insufficient for load-bearing applications
Solution Approach 1:
The patent uses a composite structure combining a metal scaffold core with a ceramic titanium dioxide coating. The metal provides mechanical strength and structural integrity for load-bearing applications, while the ceramic coating provides porosity and surface area for cell growth and bone regeneration. This composite approach resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The ceramic coating is applied as a porous layer on the metal scaffold, creating a hierarchical structure where the macro-structure provides mechanical strength and the micro-structure provides porosity for cell infiltration. The porous ceramic layer maintains the necessary pore architecture for bone regeneration while the underlying metal structure ensures adequate mechanical strength.
2Strength
If advanced techniques like chemical vapor deposition are used to improve mechanical strength, then structural integrity is enhanced, but material and processing costs increase significantly
Solution Approach 1:
The patent replaces complex chemical vapor deposition processes with a simpler physical coating method where ceramic particles are applied to the metal scaffold and sintered together. This substitution of the coating technique reduces processing complexity and cost while still achieving the desired mechanical strength improvement through the metal-ceramic composite structure.
3Ease of operation
If pore size and porosity are increased to improve cell migration and nutrient delivery, then tissue regeneration is enhanced, but mechanical strength is reduced
Solution Approach 1:
The patent creates a multi-scale porous structure where large macropores (hundreds of micrometers to millimeters) are distributed throughout the ceramic coating, enabling cell migration and nutrient transport. Simultaneously, the hierarchical pore architecture at the micro-scale maintains structural integrity. The metal scaffold provides the macro-structural strength while the ceramic coating provides the bioactive porosity.
Solution Approach 2:
The composite metal-ceramic structure allows the metal to bear the mechanical loads while the ceramic coating provides the necessary porosity for cell migration. The metal substrate maintains structural strength even when the ceramic coating has high porosity, thus resolving the contradiction between pore architecture and mechanical strength.
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 recoated titanium dioxide scaffolds exhibit significantly increased compressive strength while maintaining the desired pore architectural features, making them suitable for load-bearing bone structures and reducing the risk of adverse reactions, thus enhancing their biocompatibility and tissue regeneration capabilities.
Implementation Method 1
applying a first slurry comprising titanium dioxide to a combustible porous structure; allowing the first slurry to solidify on said combustible porous structure
Implementation Method 2
removing said combustible porous structure from the solidified titanium dioxide slurry by a first sintering at about 400-550° C.
Implementation Method 3
subjecting the titanium dioxide scaffold structure of step c) to a second sintering at a temperature of at least 1300° C. for at least 10 hours to provide a single-coated titanium dioxide scaffold
Implementation Method 4
applying a second slurry comprising titanium dioxide to said single coated titanium dioxide scaffold by vacuum infiltration and thereafter optionally subjecting said single-coated titanium dioxide scaffold to centrifugation
Implementation Method 5
allowing the second slurry of step e) to solidify on the single-coated titanium dioxide scaffold
Implementation Method 6
performing a third sintering at a temperature of at least 1100° C. to provide a recoated titanium dioxide scaffold
Data Source
AI summary
The present document is directed to medical implants in the form of titanium dioxide scaffolds. Disclosed is a method for producing titanium dioxide scaffolds having an increased mechanical strength by recoating the titanium dioxide scaffold with a low viscosity titanium dioxide slurry in a vacuum infiltration process followed by sintering of the scaffold. The document is also directed to the recoated titanium dioxide scaffolds produced and their uses as medical implants.