Silk-Based Calcium Phosphate Ceramic Scaffolds for Load-Bearing Bone
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for fabricating calcium phosphate ceramic scaffolds lack the ability to create high-strength, complex geometry structures that match the mechanical properties of human cortical bone, due to limitations in control over porosity and pore size, and are not suitable for load-bearing orthopedic applications.
Innovation Solution
The use of silk fibroin as a sacrificial porogen and consolidation reagent to create stable calcium phosphate ceramic green bodies, allowing for the formation of high-strength, porous ceramic materials with controlled porosity and complex geometries through sintering and post-processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If calcium phosphate ceramic scaffolds are made highly porous to encourage bone ingrowth, then porosity is improved, but mechanical strength significantly decreases
Solution Approach 1:
The invention changes the pore size distribution parameter, creating a bimodal pore structure with specific size ranges (50-100 microns and smaller pores) to optimize both bone ingrowth and mechanical strength, resolving the contradiction between porosity and strength
Solution Approach 2:
The invention uses composite materials by combining calcium phosphate ceramics with collagen fibers, creating a composite scaffold that maintains high porosity (60-70%) while significantly improving mechanical strength and fracture toughness to match cortical bone properties
2Strength
If calcium phosphate ceramic scaffolds are designed for load-bearing applications, then mechanical strength is improved, but fracture toughness remains extremely low due to brittleness
Solution Approach 1:
The invention creates a composite material system combining calcium phosphate ceramic particles with type I collagen fibers, where the collagen provides ductility and fracture toughness while the ceramic provides compressive strength, achieving fracture toughness of 1.3 kJm−3 comparable to cortical bone
Solution Approach 2:
The invention applies local quality by distributing collagen fibers throughout the ceramic matrix and creating regions with different pore size distributions, allowing different areas of the scaffold to provide different functions (load bearing vs. bone ingrowth)
3Quantity of substance
If traditional fabrication methods are used to create porous calcium phosphate scaffolds, then porosity is achieved, but control over pore size and geometry is insufficient for complex patient-specific designs
Solution Approach 1:
The invention uses parameter changes by controlling the concentration and molecular weight of collagen fibers to precisely control pore size distribution, achieving specific pore size ranges (50-100 microns) through systematic variation of collagen parameters
Solution Approach 2:
The invention applies preliminary action by first forming the collagen fiber network structure before adding calcium phosphate particles, allowing precise control over the pore-forming framework to be established before the final scaffold structure develops
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 approach enables the production of calcium phosphate ceramic scaffolds with mechanical properties comparable to human cortical bone, suitable for load-bearing applications, and allows for patient-specific designs by enabling the creation of complex shapes and controlled porosity.
Implementation Method 1
forming a green body from the composition; and sintering the green body to form the porous ceramic material
Data Source
AI summary
The disclosure provides ceramic materials comprising calcium phosphate material and silk and processes and methods for preparing and uses thereof.