Inorganic Bone Substitute Binder via Low-Temperature Hydration
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Solution Overview
Problem
Conventional synthetic bone substitutes, such as hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP), have high crystallinity and low biodegradation rates, leading to limited bone regeneration and difficulties in mass-producing octacalcium phosphate (OCP) due to temperature and pH sensitivity, while existing polymers used as binders face challenges in biocompatibility and safety during sterilization.
Innovation Solution
A method for preparing an inorganic binder containing OCP and HA crystal phases by mixing α-TCP powder with phosphate powder, water, and saline, followed by hydration and drying, allowing for the production of a bone substitute with improved biocompatibility and bone regeneration capabilities, avoiding high-temperature processing and enhancing biosafety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional synthetic bone substitutes (HA, β-TCP) are used with high crystallinity, then manufacturing stability is improved, but bone regeneration capability deteriorates due to low biodegradation rates
Solution Approach 1:
The patent changes the crystallinity parameter of calcium phosphate materials by controlling synthesis conditions (temperature, pH, time) to produce OCP with lower crystallinity than conventional HA or β-TCP. This parameter change enables improved biodegradation rate and bone regeneration capability while maintaining manufacturing feasibility through optimized low-temperature synthesis protocols
Solution Approach 2:
The patent creates composite bone substitute materials by combining OCP with other calcium phosphate phases (such as β-TCP or HA) in specific ratios. This composite approach allows the material to benefit from the high bone regeneration capability of OCP while incorporating the stability and mechanical strength of other phases, thereby resolving the contradiction between crystallinity and bone regeneration
2Reliability
If OCP is produced by conventional methods, then bone regeneration capability is improved, but mass-production difficulty increases due to temperature and pH sensitivity
Solution Approach 1:
The patent fundamentally changes the synthesis parameters from conventional high-temperature (≥900°C) methods to low-temperature (≤100°C) aqueous synthesis. This parameter change includes optimizing pH control, reaction time, and precursor selection to enable reliable OCP formation under mild conditions that are suitable for scalable industrial production while preserving OCP's superior bone regeneration properties
Solution Approach 2:
The patent replaces the thermal energy-based synthesis mechanism with a chemically-driven aqueous synthesis mechanism. Instead of relying on high-temperature thermal processes that are difficult to control at scale, the invention uses controlled chemical reactions in aqueous solutions at low temperatures, which are more amenable to consistent mass-production and quality control
3Ease of manufacture
If organic polymer binders are used in bone substitutes, then ease of manufacture is improved, but biocompatibility deteriorates due to sterilization side effects
Solution Approach 1:
The patent extracts and removes organic polymer binders from the bone substitute composition entirely. By eliminating these organic components, the invention avoids all sterilization-related side effects and biocompatibility issues associated with polymers, while maintaining ease of manufacture through direct sintering or bonding of inorganic calcium phosphate particles without requiring organic binding agents
Solution Approach 2:
The patent replaces durable organic polymer binders with inorganic calcium phosphate particles that can be directly bonded through sintering or chemical bonding. This substitution uses simple, inert inorganic materials that are inherently biocompatible and eliminate the need for complex polymer synthesis and sterilization processes, thereby improving both biocompatibility and manufacturing simplicity
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 method enables easy mass-production of a biocompatible inorganic binder with improved resorption and bone regeneration, reducing the risk of side effects and achieving effective bone substitution with controlled crystalline phases, as demonstrated by XRD analysis and biocompatibility tests.
Implementation Method 1
subjecting the molded article to hydration reaction
Data Source
AI summary
A method of preparing an inorganic binder for medical use according to an embodiment of the present disclosure includes preparing a starting material using a-TCP powder and phosphate powder each of which has a predetermined particle size, producing a paste having a predetermined viscosity that is suitable for formation of a molded article having a predetermined shape by homogeneously mixing the starting material, adding water or saline to the homogeneously mixed starting material, and kneading the resulting mixture, subjecting the molded article to hydration reaction, and washing and drying the molded article having undergone the hydration reaction to obtain an inorganic binder containing OCP and HA crystal phases.