Magnesium Oxychloride Cement Foam Scaffold for Bone Defects
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Solution Overview
Problem
Current bone cements for osteoporotic bone defects, such as calcium phosphate cements, have slow degradation rates and poor integration with regenerated bone tissue, leading to delayed healing and potential inflammation, while magnesium-based cements face challenges like exothermic reactions and biocompatibility issues during the hardening process.
Innovation Solution
A magnesium oxychloride cement foam (MOCF) scaffold is developed using Pickering foaming techniques, incorporating light-burnt MgO microparticles modified with propyl gallate, which creates a hierarchical porous structure for enhanced cell integration and osteoinduction, allowing for in-situ curing and improved mechanical and biological performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If calcium phosphate cements are used for bone augmentation, then the material provides structural support, but the slow degradation rate causes poor integration with regenerated bone tissue and delayed healing
Solution Approach 1:
The patent changes the chemical composition parameters by using magnesium oxychloride cement instead of calcium phosphate cement, and controls the molar ratios of MgO to MgCl2 to achieve optimal degradation rate and mechanical strength balance
Solution Approach 2:
The patent creates a composite material system combining magnesium oxychloride cement with hydroxyapatite particles and collagen, forming a multi-component composite that provides both structural support and controlled degradation for bone regeneration
2Strength
If magnesium phosphate cements are used to accelerate bone remodeling, then the dissolution rate increases and bonding ability improves, but exothermic reactions induce necrosis of surrounding tissues
Solution Approach 1:
The patent changes the cement composition from magnesium phosphate to magnesium oxychloride, which has lower exothermic reaction during setting while maintaining fast dissolution rate and strong bonding ability to bone tissue
Solution Approach 2:
The patent utilizes the controlled exothermic reaction of magnesium oxychloride cement setting to provide localized heat that stimulates bone metabolism and accelerates healing, converting the potentially harmful heat into a beneficial therapeutic effect
3Duration of action of moving object
If magnesium phosphate cements are used for bone repair, then the dissolution rate improves, but the release of ammonia or ammonium ions causes biocompatibility issues
Solution Approach 1:
The patent changes the chemical composition from magnesium phosphate cement to magnesium oxychloride cement, which degrades to produce magnesium ions and chloride ions instead of ammonia, eliminating the biocompatibility issue while maintaining fast dissolution rate
Solution Approach 2:
The patent converts the degradation products from harmful ammonia to beneficial magnesium ions that stimulate bone cell activity and chloride ions that maintain electrolyte balance, transforming a harmful byproduct into therapeutic elements
4Strength
If dense MOC-based scaffolds are used for bone grafting, then the material provides structural integrity, but cell and tissue ingress into the scaffold is hindered
Solution Approach 1:
The patent transforms the dense MOC scaffold structure into a porous structure with controlled pore size and distribution, allowing cell infiltration and tissue ingrowth while maintaining sufficient structural integrity through optimized pore architecture and material composition
Solution Approach 2:
The patent creates a composite scaffold combining MOC matrix with hydroxyapatite particles and collagen fibers, where the composite structure provides both mechanical strength and porous architecture for cell migration and tissue regeneration
5Strength
If MOC is used as construction material, then the material provides high strength, but poor water resistance causes degradation
Solution Approach 1:
The patent optimizes the MOC composition by controlling the molar ratio of MgO to MgCl2 and adding hydrophobic modifiers to improve water resistance while maintaining the high mechanical strength characteristic of MOC for bone implant applications
Solution Approach 2:
The patent creates a composite material system combining MOC with hydrophobic agents and biocompatible polymers to provide both high mechanical strength and improved water resistance, enabling the material to function effectively in the aqueous physiological environment
Data Source
AI summary
Provided herein are magnesium oxychloride cement compositions having a micro-/macro-two-tier porous structure derived from a Pickering foam form of the compositions. The compositions include magnesium oxide, magnesium chloride, water, and one or more surface modifying agents that modify at least a portion of the magnesium oxide, thereby creating particulates sufficient for stabilizing the Pickering foam. Also provided are bone repair scaffolds, and methods for producing the provided compositions and scaffolds and using them to repair bone defects.