Silicate Carbonate Co-Substituted Calcium Phosphate Bone Grafts
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Solution Overview
Problem
Current synthetic bone replacement materials, such as hydroxyapatite, lack biological activity and strength due to differences in composition compared to natural bone, and existing methods for bone grafting face limitations in supply and consistency.
Innovation Solution
A process for preparing a silicate and carbonate co-substituted calcium phosphate material through aqueous precipitation and subsequent heating, which substitutes silicate and carbonate ions into the apatite lattice, maintaining a Ca/P ratio of 1.67 or above, resulting in a material with enhanced biocompatibility and structural similarity to natural bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If synthetic hydroxyapatite is used as bone replacement material, then structural similarity to natural bone is achieved, but biological activity and strength are reduced
Solution Approach 1:
The invention changes the compositional parameters of hydroxyapatite by introducing carbonate and silicate substitutions. The carbonate content is controlled at 3-15 wt% and silicate content at 0.1-5 wt%, which modifies the crystal structure to better match natural bone while enhancing biological activity and mechanical strength
Solution Approach 2:
The invention creates a composite material system by combining multiple elements (calcium, phosphate, carbonate, silicate) in specific ratios. This composite approach allows the material to simultaneously achieve structural similarity to natural bone and enhanced biological properties that pure hydroxyapatite cannot provide
2Reliability
If traditional bone grafting methods (autograft and allograft) are used, then bone replacement is achieved, but supply limitations and consistency issues occur
Solution Approach 1:
The invention creates a synthetic copy of natural bone material (hydroxyapatite) that replicates its essential structure and properties. By copying the compositional characteristics of natural bone including carbonate and silicate content, the synthetic material provides unlimited supply while maintaining the biological effectiveness of traditional bone grafts
3Strength
If carbonate substitution is increased in hydroxyapatite, then biological activity is improved, but material stability may be compromised
Solution Approach 1:
The invention optimizes the carbonate content parameter within a specific range (3-15 wt%) to achieve the desired balance. This controlled parameter change ensures sufficient biological activity while preventing excessive carbonate substitution that would compromise structural stability
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 material is thermally stable, biocompatible, and exhibits improved bioactivity and strength, closely mimicking natural biological hydroxyapatites, making it suitable for bone replacement and grafting applications.
Implementation Method 1
forming a silicon and optionally carbon-containing calcium phosphate precipitate by an aqueous precipitation method involving preparing an aqueous solution comprising phosphate ions, silicate ions, calcium ions and optionally carbonate ions
Implementation Method 2
heating the precipitate in an atmosphere comprising carbon and oxygen to form a silicate and carbonate co-substituted calcium phosphate material
Implementation Method 3
heating the precipitate in an atmosphere comprising carbon and oxygen
Data Source
AI summary
The present invention provides a process for the preparation of a silicate and carbonate co-substituted calcium phosphate material. The process comprises the steps of: forming a silicon and optionally carbon-containing calcium phosphate precipitate by an aqueous precipitation method involving preparing an aqueous solution comprising phosphate ions, silicate ions, calcium ions and optionally carbonate ions, wherein the ratio of Ca/P and of Ca/(P+Si) in the solution is maintained above approximately 1.67; and heating the precipitate in an atmosphere comprising carbon and oxygen to form a silicate and carbonate co-substituted calcium phosphate material.The present invention also provides a synthetic carbonate and silicate co-substituted hydroxyapatite material, as well as a biomedical material.