Self-foaming Calcium Phosphate Bone Cement for Porosity and Crystallinity
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Solution Overview
Problem
Current bone cement formulations lack both adequate crystallinity and porosity, which are essential for efficient bone remodeling and accretion, leading to inadequate bone growth and increased osteoclastic activity in conditions like osteoporosis.
Innovation Solution
A self-setting calcium phosphate cement formulation with macroscopic pores of varying sizes and densities is developed, enhancing the surface area for bone turnover, comprising components like tricalcium phosphate, strontium hydrophosphate, and hydroxyapatite, with a phosphate buffer to maintain an acidic pH for foaming and porosity creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bone cement formulations are designed to have adequate crystallinity, then bone accretion is enhanced, but porosity becomes inadequate
Solution Approach 1:
The patent applies porous materials by incorporating a porogen phase (such as salt particles or expandable beads) into the bone cement formulation. This porogen creates macroscopic pores of varying sizes after dissolution or expansion, providing adequate porosity while maintaining the crystalline structure of calcium phosphate for bone accretion. The porous structure allows bone ingrowth and remodeling while preserving crystallinity benefits.
Solution Approach 2:
The patent uses composite materials by combining multiple phases including crystalline calcium phosphate (for accretion), amorphous calcium phosphate (for resorption), and porogen materials (for pore formation). This multi-phase composite approach enables simultaneous achievement of adequate crystallinity, porosity, and controlled resorption rates that single-phase materials cannot provide.
2Quantity of substance
If bone cement formulations are designed to have adequate porosity, then bone remodeling is enhanced, but crystallinity becomes inadequate
Solution Approach 1:
The patent applies porous materials by incorporating a porogen phase (such as salt particles or expandable beads) into the bone cement formulation. This porogen creates macroscopic pores of varying sizes after dissolution or expansion, providing adequate porosity while maintaining the crystalline structure of calcium phosphate for bone accretion. The porous structure allows bone ingrowth and remodeling while preserving crystallinity benefits.
Solution Approach 2:
The patent uses composite materials by combining multiple phases including crystalline calcium phosphate (for accretion), amorphous calcium phosphate (for resorption), and porogen materials (for pore formation). This multi-phase composite approach enables simultaneous achievement of adequate crystallinity, porosity, and controlled resorption rates that single-phase materials cannot provide.
3Productivity
If systemic substances are used to accelerate bone formation, then bone formation rate increases, but adverse side effects occur
Solution Approach 1:
The patent applies self-service by designing a bone cement that autonomously stimulates bone formation through its intrinsic properties rather than requiring external systemic substances. The controlled resorption of amorphous calcium phosphate and the presence of macroscopic pores create a self-stimulating environment that promotes osteoblastic activity and bone accretion locally at the implant site, avoiding systemic side effects.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical properties of the bone cement formulation, specifically the ratio of crystalline to amorphous calcium phosphate and the pore size distribution. These parameter adjustments create optimal conditions for bone formation without requiring systemic pharmacological intervention, thereby avoiding adverse side effects while maintaining high bone formation rates.
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 formulation provides substantial regions for bone turnover, promoting increased osteoblastic activity and bone accretion, while maintaining structural integrity and reducing catabolic processes, thus addressing the limitations of existing bone cements.
Implementation Method 1
The liquid component has a pH of less than 7.0, and the mixture of the dry component and the liquid component generates carbon dioxide (CO2) bubbles upon contact
Implementation Method 2
The outgassing of CO2 in the slightly acidic mixture from the carbonate generates internal bubbles in the mixture, yielding a foamed structure upon curing of the cement
Data Source
AI summary
A self-foaming bone cement is described herein. In one variation, the bone cements include a self setting calcium phosphate cement formulation which when cured, forms macroscopic pores of varying sizes and densities with sufficient surface area to provide substantial regions for bone turnover.