Porous Polysaccharide Scaffold with Nano-Hydroxyapatite for Bone Regeneration
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Solution Overview
Problem
Current methods for treating bone-related disorders, such as bone defects and fractures, face limitations including risk of rejection, dependence on size and location of the defect, and inefficacy in non-osseous sites, with existing scaffolds requiring growth factors or stem cells for bone formation.
Innovation Solution
A porous polysaccharide scaffold incorporating nano-hydroxyapatite is developed, created through an alkaline aqueous solution process involving cross-linking and porogen agents, allowing for bone formation without growth factors or stem cells, and adaptable to various bone sizes and locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autologous bone is used for bone defect treatment, then bone regeneration is achieved, but secondary trauma occurs at the donor site
Solution Approach 1:
The patent introduces a porous scaffold as an intermediary material that provides structural support for bone regeneration without requiring harvest from the patient's own bone. The scaffold serves as a temporary matrix that guides new bone formation, eliminating the need for autologous bone harvesting and thus preventing secondary trauma at the donor site.
2Reliability
If allograft bone is used for bone defect treatment, then bone defect is filled, but immune repulsion occurs
Solution Approach 1:
The patent changes the material parameters by using synthetic biocompatible materials (such as polymers, ceramics, or composites) with controlled porosity, degradation rate, and mechanical properties. This eliminates the immunogenicity of allograft bone while maintaining the structural function of filling bone defects. The scaffold is designed to be biodegradable, gradually replacing itself with newly formed bone tissue.
3Strength
If conventional scaffolds are used for bone formation, then structural support is provided, but growth factors or stem cells are required
Solution Approach 1:
The patent designs a self-service scaffold that inherently promotes bone formation through its material composition and structural characteristics. The scaffold contains osteoinductive elements or surface properties that actively stimulate mesenchymal stem cells in the surrounding tissue to differentiate into osteoblasts, eliminating the need for exogenous growth factors or additional stem cell injections. The scaffold essentially performs the function of both structural support and biological activation.
4Strength
If hydroxyapatite is used for bone treatment, then bonding with bone is achieved, but effectiveness is limited to osseous sites
Solution Approach 1:
The patent develops a universal scaffold system that can be applied to various types of bone defects regardless of location or size. The scaffold combines multiple materials (such as polymer-ceramic composites) that provide both mechanical strength and osteoinductive properties, making it effective for both osseous and non-osseous bone sites. The modular design allows adaptation to different anatomical locations and defect configurations.
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 scaffold induces mineralization and bone formation in both osseous and non-osseous sites, promoting vascularization and osteoblast recruitment, offering a versatile solution for bone repair and regeneration.
Implementation Method 1
transforming the solution into a hydrogel by placing said solution at a temperature from about 4° C. to about 80° C. for a sufficient time to allow the cross-linking of said amount of polysaccharide
Implementation Method 2
preparing an alkaline aqueous solution comprising an amount of at least one polysaccharide, an amount of a cross-linking agent and an amount of a porogen agent
Data Source
AI summary
The present invention relate to three dimensional porous polysaccharide matrices able to induce mineralization of a tissue in osseous site, as well as in non-osseous site, in the absence of stem cells or growth factors.