Laser-Synthesized Apatite Powder for Controlled Bioactive Coatings
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Solution Overview
Problem
Conventional methods for synthesizing apatite powder, such as solid-phase and hydrothermal synthesis, are inefficient due to high temperatures, complex processes, and limitations in particle size and crystallinity control, making them unsuitable for industrial production and bioactive surface treatment of titanium-based implants.
Innovation Solution
A method involving immersion of a substrate in an apatite-forming precursor solution and irradiation with a laser beam to generate apatite powder, allowing control over particle size, crystallinity, and composition through adjustments in solution concentration, laser power, and irradiation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid-phase synthesis is used to prepare apatite, then apatite with acicular or planar particle shape can be obtained, but heat treatment at high temperature (800-1200°C) results in too large particle size and requires complicated post processing
Solution Approach 1:
The patent changes the temperature parameter from high temperature (800-1200°C) to low temperature (room temperature or slightly elevated), and changes the reaction phase from solid-phase to solution-phase, thereby obtaining apatite particles of suitable size without complicated post-processing
Solution Approach 2:
The patent replaces the mechanical/thermal processing system (heat treatment, mixing, calcining, pulverizing) with a chemical solution-based system where apatite forms directly in solution with controlled particle size, eliminating the need for complicated post-processing steps
2Manufacturing precision
If hydrothermal synthesis is used to prepare apatite, then apatite can be synthesized in an autoclave at elevated temperature, but a two-stage process with various additives makes the process complicated and unsuitable for mass production
Solution Approach 1:
The patent extracts and eliminates the complex two-stage process and various additives from the hydrothermal synthesis method, achieving apatite synthesis in a single simplified step using a solution-based approach without requiring an autoclave
Solution Approach 2:
The patent changes the temperature parameter from elevated temperature (150-250°C) to lower temperature, and simplifies the process from two-stage to single-stage, making the synthesis suitable for mass production
3Reliability
If titanium-based alloys are used for implants, then excellent biocompatibility and corrosion resistance are achieved, but the material cannot directly induce osteogenesis and requires long treatment time
Solution Approach 1:
The patent creates a composite structure by coating titanium-based alloy with apatite powder, combining the excellent biocompatibility and corrosion resistance of titanium with the osteogenic properties of apatite, thereby achieving both reliability and reduced integration time
Solution Approach 2:
The patent applies apatite coating specifically on the surface of the titanium implant where bone contact occurs, providing local osteogenic activity at the implant-bone interface while maintaining the bulk properties of titanium
4Reliability
If conventional surface treatment is applied to titanium implants, then bioactivity is improved, but the treatment process is complex and the oxide coating is too thin to induce tissue regeneration
Solution Approach 1:
The patent creates a composite surface structure by depositing apatite powder on titanium surface, providing high bioactivity and sufficient coating thickness for tissue regeneration while simplifying the treatment process
Solution Approach 2:
The patent changes the coating material from thin titanium oxide to apatite powder coating, providing sufficient thickness and high bioactivity, and simplifies the process from complex conventional treatment to laser-assisted apatite deposition
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
This method enables the rapid and efficient synthesis of apatite powder with controlled properties, enhancing bioactivity and reducing implant-bone integration time, and allows for the production of various apatite forms like hydroxyapatite and whitlockite with improved crystallinity and particle sizes, suitable for biomedical applications.
Implementation Method 1
emitting a laser beam to a region on the substrate immersed in the precursor solution
Implementation Method 2
obtaining apatite powder generated in the precursor solution
Data Source
AI summary
Provided is a method of synthesizing apatite powder by emitting a laser beam to a surface of a substrate immersed in a precursor solution. The method is including immersing a substrate in an apatite-forming precursor solution, emitting a laser beam to a region on a surface of the substrate immersed in the precursor solution, and obtaining apatite powder generated in the precursor solution.