Spherical Bioactive Glass for Controlled Ion Release
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Solution Overview
Problem
Existing bioactive glass particles used for bone healing are irregularly shaped, leading to suboptimal ion release profiles and bone formation, with smaller particles causing rapid ion burst and larger particles releasing ions too slowly, and current manufacturing methods are inefficient due to the need for narrow size ranges.
Innovation Solution
The use of substantially spherical bioactive glass particles with unimodal or bimodal particle size distributions, which provide a controlled and reproducible ion release profile, improving bone formation and fusion by optimizing particle shape and size for better handling and resorption rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If irregularly shaped bioactive glass particles are used, then manufacturing is easier with broader size ranges, but ion release is uncontrolled with burst release from smaller particles and slow release from larger particles
Solution Approach 1:
The patent applies spheroidality by transforming irregularly shaped glass particles into substantially spherical particles. This shape change provides uniform surface area to volume ratios across all particles, enabling controlled and consistent ion release profiles. The spherical geometry eliminates the variability inherent in irregular shapes, where surface area and volume relationships differ significantly between particles of the same nominal size, thereby preventing burst release and ensuring stable ion delivery.
Solution Approach 2:
The patent employs parameter changes by establishing specific particle size ranges (e.g., 200-400 μm or 300-500 μm) for spherical particles. By controlling the size parameter within these defined ranges and maintaining spherical geometry, the patent achieves optimal balance between handling characteristics and controlled ion release. This parameter optimization resolves the contradiction by providing both manufacturability through defined size ranges and stability through consistent ion release kinetics.
2Productivity
If smaller particles are used, then bone formation rate increases by providing nuclei for bone tissue formation, but ion burst release occurs before sufficient bone growth
Solution Approach 1:
The spherical shape provides uniform surface area to volume ratios that prevent the burst release phenomenon observed in smaller irregular particles. The geometry ensures that ion release occurs at a controlled, sustained rate rather than in an uncontrolled burst, while still maintaining particle sizes small enough to serve as effective nuclei for bone tissue formation and support osteoconduction.
Solution Approach 2:
The patent optimizes particle size parameters to specific ranges (200-400 μm or 300-500 μm) that balance bone formation promotion with controlled ion release. These size parameters are sufficiently small to provide numerous nuclei for bone tissue formation and support excavation, yet the spherical geometry ensures controlled ion release kinetics that prevent harmful burst release.
3Stability of the object's composition
If larger particles are used, then ion release is controlled and sustained, but bone formation rate decreases and handling becomes difficult
Solution Approach 1:
The patent optimizes particle size parameters to specific ranges (200-400 μm or 300-500 μm) that balance controlled ion release with effective bone formation promotion. These size parameters are sufficiently small to provide adequate surface area for bone tissue formation and support excavation, while the spherical geometry ensures controlled ion release kinetics. This parameter optimization resolves the contradiction by achieving both controlled ion release and adequate bone formation rate.
4Stability of the object's composition
If narrow size ranges are used, then ion release is controlled, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent defines specific particle size ranges (200-400 μm or 300-500 μm) that are narrow enough to ensure controlled ion release profiles but broad enough to allow efficient manufacturing. The spherical geometry combined with these optimized size parameters provides consistent performance across the size range, enabling controlled ion release without requiring excessively narrow size distributions that would increase manufacturing complexity and cost.
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
Substantially spherical bioactive glass particles enhance bone formation and fusion rates by controlling ion release and providing a scaffold for continued bone growth, outperforming irregular particles in both speed and robustness of bone healing.
Implementation Method 1
The formation of this layer is linked to the glass dissolution, subsequent release of calcium (Ca) and phosphorus (P) ions
Implementation Method 2
subsequent release of calcium (Ca) and phosphorus (P) ions
Implementation Method 3
The layer eventually crystallizes into hydroxy-carbano-apatite
Implementation Method 4
results in an interfacial bond between the bioactive glass and the bone which improves bone healing around the bioactive glass particles
Data Source
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AI summary
The present invention is directed to implantable compositions comprising substantially spherical bioactive glass particles.