Fenestrated Bone Wrap Graft Flexibility
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Solution Overview
Problem
Conventional bone grafts pose risks such as bleeding, infection, and rejection, and lack flexibility for conforming to complex bone structures, limiting their effectiveness in certain surgical applications.
Innovation Solution
A fenestrated bone wrap graft is developed by demineralizing cortical bone to extreme thinness and creating fenestrations, allowing for flexibility and conformability to fit complex shapes, including the creation of various forms like tubes or baskets that can contain bone or stem cells, facilitating improved implantation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional bone grafts are used, then bone grafting can be performed, but the grafts lack flexibility for conforming to complex bone structures
Solution Approach 1:
The patent applies this principle by creating a thin film bone graft with a thickness of 0.5mm to 2mm. This thin film structure provides the necessary flexibility to conform to complex bone surfaces while maintaining sufficient structural integrity through the controlled thickness and material properties of the demineralized bone matrix
Solution Approach 2:
The patent applies this principle by incorporating fenestrations (openings) throughout the bone graft structure. These fenestrations create a porous network that allows bone ingrowth and vascularization while maintaining the overall structural framework of the graft. The porous structure enables adaptability without compromising strength
2Adaptability or versatility
If bone grafts are made thinner to increase flexibility, then conformability improves, but structural strength may be compromised
Solution Approach 1:
The patent applies this principle by precisely controlling the thickness parameter of the bone graft to fall within the range of 0.5mm to 2mm. This parameter optimization achieves the desired balance between flexibility (requiring thinner material) and structural strength (requiring sufficient thickness). The demineralization process also changes the mechanical properties of the bone matrix, making it more flexible while maintaining integrity
3Productivity
If fenestrations are created in the bone graft, then bone ingrowth is enhanced, but the structural complexity increases
Solution Approach 1:
The patent applies this principle by dividing the bone graft into sections with fenestrations (openings) at regular intervals. This segmentation creates multiple pathways for bone ingrowth without requiring a completely complex overall structure. The fenestrations are distributed systematically rather than randomly, simplifying the manufacturing process while enhancing bone regeneration
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 fenestrated bone wrap graft enhances bone ingrowth through fenestrations, reduces surgical risks, and allows for versatile use in multiple fusions and spinal implants, providing a cost-effective and scalable solution for bone regeneration.
Implementation Method 1
preparing cortical bone in thin sheets milled, ground or planed to a very thin thickness (t) less than 1 mm then fully demineralizing it to give it formed flexibility of a wrap or drape
Data Source
AI summary
The present invention relates to a fenestrated bone wrap graft and a method of preparing cortical bone in thin sheets then fully demineralizing it to give it formed flexibility and then creating fenestrations in the cortical bone in a fashion similar to, but not identical to, skin grafts.