Composite Bioceramic for Bone Regeneration
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Solution Overview
Problem
Current orthopaedic and bone regeneration materials face challenges such as brittleness, poor mechanical strength, and limited biodegradability, which restrict their use in load-bearing applications and long-term stability, especially in areas like cortical bone, and they often induce inflammatory reactions or have high alkaline degradation products harmful to cell viability.
Innovation Solution
A composite biocompatible ceramic material comprising doped Hardystonite (Ca2ZnSi2O7) combined with a metal oxide from the spinel group, specifically Gahnite (ZnAl2O4), which forms a synergistic biocompatible material with enhanced mechanical strength, osteoconductive, and osteoinductive properties, promoting bone regeneration and vascularization while minimizing fibrotic reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure calcium silicate ceramics are used to stimulate bone growth, then bioactivity is improved, but mechanical strength and chemical stability deteriorate
Solution Approach 1:
The patent creates a composite material consisting of doped Hardystonite (calcium zinc silicate) as the primary phase combined with spinel group metal oxides (such as MgAl2O4, ZnAl2O4, or CaAl2O4) as the secondary phase. This composite structure allows the material to inherit the bioactivity of calcium silicates while gaining the mechanical strength and chemical stability of spinel compounds, thereby resolving the contradiction between bioactivity and mechanical strength.
2Reliability
If calcium silicate ceramics are used to stimulate bone growth, then bone formation is promoted, but chemical stability deteriorates leading to high degradation rate and alkaline environment
Solution Approach 1:
By combining doped Hardystonite with spinel group metal oxides, the composite material maintains the ability to promote bone formation through controlled degradation while the spinel phase provides chemical stability that prevents excessive alkaline environment. The spinel compounds act as a stabilizing component that moderates the degradation behavior of the calcium silicate phase.
3Strength
If current orthopaedic materials are used for load-bearing applications, then initial implant stability is achieved, but long-term stability deteriorates due to brittleness and poor mechanical strength
Solution Approach 1:
The composite of doped Hardystonite and spinel group metal oxides provides both the initial mechanical strength needed for implant stability and the long-term durability required for load-bearing applications. The spinel phase contributes to fracture resistance and mechanical strength, while the doped Hardystonite phase provides bioactivity and controlled degradation, ensuring long-term stability.
4Adaptability or versatility
If synthetic bone grafts are used to replace autografts and allografts, then supply limitations and immunogenicity issues are resolved, but mechanical properties and biodegradability control deteriorate
Solution Approach 1:
The composite material combines the advantages of synthetic materials (unlimited supply, no immunogenicity) with controlled biodegradability. The doped Hardystonite phase provides controlled degradation into non-toxic products, while the spinel phase maintains structural integrity, achieving both supply availability and controlled biodegradability.
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 3A~3C
AI summary
The present invention relates to a biocompatible material and in particular to a two-phase or composite biocompatible ceramic material, wherein the first phase is a doped calcium zinc silicate and the second phase is a metal oxide. In an embodiment, the invention has been developed for use in tissue regeneration including bone tissue. In other embodiments, the invention has been developed as a coating to improve the long-term stability of prior art implantable medical devices.