Bone-Collagen Composite Cross-Linking for Stress Shielding
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Solution Overview
Problem
Current bone grafts and substitutes face limitations in mechanical strength, degradation rate, and ability to support physiologic loading, with metal implants causing stress shielding and decreased bone density, and existing bone substitutes failing to provide immediate mechanical support and optimal remodeling.
Innovation Solution
A composition of bone and collagen, where the collagen is acid-treated and cross-linked using dehydrothermal treatment under compressive force or with a citric acid derivative, preserving the visible band structure and allowing for customizable ratios of bone to collagen and inclusion of hydroxyapatite or inorganic bone substitute materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal implants are used to replace injured bone, then mechanical strength and support are improved, but bone density decreases due to stress shielding
Solution Approach 1:
The patent applies parameter changes by controlling the degradation rate of the bone graft composite through adjustments in composition (bone to collagen ratio), processing methods (dehydrothermal treatment conditions), and chemical modifications (cross-linking agents). This allows the mechanical properties to be tuned over time, transitioning from initial strength to gradual degradation, thereby preventing stress shielding while maintaining structural integrity during healing.
Solution Approach 2:
The patent uses composite materials by combining bone graft material with collagen and other biomaterials in specific ratios. This composite structure provides both immediate mechanical support and controlled degradation, allowing the implant to gradually transfer load to the healing bone while preventing stress shielding effects associated with permanent metal implants.
2Reliability
If bone grafts are used to replace injured bone, then biological compatibility is improved, but mechanical strength and support are insufficient
Solution Approach 1:
The patent combines bone graft material with collagen and other biomaterials to create a composite that maintains biological compatibility while enhancing mechanical strength. The collagen component provides structural support and facilitates integration with host tissue, while the bone graft material provides immediate mechanical strength and support.
Solution Approach 2:
The patent adjusts parameters such as the ratio of bone graft material to collagen, processing conditions (dehydrothermal treatment temperature and time), and cross-linking methods to optimize both mechanical strength and biological compatibility. These parameter changes allow the composite to achieve the desired balance between strength and biocompatibility.
3Strength
If bone substitute materials are used to replace injured bone, then mechanical support is provided, but remodeling and integration are insufficient
Solution Approach 1:
The patent controls the degradation rate and remodeling characteristics by adjusting composition parameters (bone to collagen ratio), processing parameters (dehydrothermal treatment conditions), and chemical modifications (cross-linking agents). This allows the material to provide initial mechanical support while gradually degrading to allow host bone remodeling and integration.
Solution Approach 2:
The patent creates a dynamic implant that transitions from a rigid, load-bearing structure to a degrading material that allows remodeling. The controlled degradation rate enables the implant to maintain mechanical support during the early healing phase and then gradually allow for bone remodeling and integration with host tissue.
4Productivity
If dehydrothermal treatment is performed under vacuum to cross-link collagen, then cross-linking efficiency is improved, but collagen structure and visible band pattern are compromised
Solution Approach 1:
The patent replaces the vacuum-based mechanical drying system with a dehydrothermal treatment system that uses controlled heat and pressure. This substitution achieves effective cross-linking without the harmful effects of vacuum processing, preserving the collagen's visible band pattern and structural integrity while maintaining cross-linking efficiency.
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 solution enables direct bone ingrowth and remodeling, supports various shapes and sizes, and can be porous for enhanced integration, improving patient outcomes by providing mechanical support and promoting bone regeneration.
Implementation Method 1
the collagen is acid treated, and cross-linked via dehydrothermal treatment under a compressive force of at least approximately 40 MPa
Implementation Method 2
the collagen is acid treated, and cross-linked via dehydrothermal treatment under a compressive force of at least approximately 40 MPa
Implementation Method 3
the collagen is acid treated, and cross-linked via dehydrothermal treatment under a compressive force of at least approximately 40 MPa
Implementation Method 4
cross-linked via dehydrothermal treatment under a compressive force of at least approximately 40 MPa
Data Source
AI summary
A composition includes bone and collagen, wherein the collagen has been acid treated, and cross-linked via dehydrothermal treatment or by a cross-linking agent (e.g., a citric acid derivative) under a compressive force of at least approximately 40 MPa.