Biomimetic Scaffolds With Devitalized Cells For Bone Regeneration
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Solution Overview
Problem
Current bone grafting methods, such as using autograft and allograft bone, are insufficient for large skeletal defects due to limited availability, surgical risks, and high failure rates, with allografts posing risks of disease transmission and mechanical instability.
Innovation Solution
Development of a biomimetic scaffold incorporating devitalized cells, such as human mesenchymal stem cells and endothelial colony-forming cells, on a porous synthetic substrate for sustained release of growth factors like BMP2 and VEGF, promoting osteogenesis and immune regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If allograft bone is used to fill large skeletal defects, then the quantity of graft material is sufficient, but the mechanical strength and stability are insufficient leading to high failure rates
Solution Approach 1:
The patent combines devitalized allogeneic bone cells with a synthetic polymer scaffold (e.g., PCL, PLGA, or collagen) to create a composite graft material. The synthetic scaffold provides mechanical strength and structural stability, while the devitalized bone cells contribute growth factors and osteoinductive properties. This composite approach resolves the contradiction by integrating both quantity sufficiency and mechanical strength in a single graft material.
2Reliability
If chemical processing of allograft bone is performed to prevent immune response, then immune rejection is reduced, but growth factors are removed reducing regenerative capacity
Solution Approach 1:
The patent extracts only the necessary component (bone cells) from the allograft bone through decellularization processes, removing immune-rejectable elements while preserving growth factors within the extracted cells. These devitalized cells are then incorporated into a synthetic scaffold, achieving both immune compatibility and growth factor retention without requiring extensive chemical processing of the entire bone structure.
Solution Approach 2:
The bone cells are devitalized and prepared in advance before being incorporated into the synthetic scaffold. This preliminary devitalization step eliminates immune rejection risks while preserving growth factors, allowing the scaffold to be implanted without requiring post-implantation immune suppression. The growth factors are pre-loaded into the scaffold structure, ensuring their sustained release at the implant site.
3Reliability
If autograft bone is used to provide continuous supply of growth factors and cells, then regenerative capacity is superior, but the quantity available is insufficient for large defects
Solution Approach 1:
The patent creates an artificial copy of the autograft's regenerative function by incorporating devitalized allogeneic bone cells into a synthetic scaffold. Instead of relying on the patient's own limited bone supply, the scaffold is pre-loaded with allogeneic bone cells that have been devitalized to eliminate immune rejection while preserving their growth factor content. This copying approach replicates the regenerative benefits of autografts without the limitations of donor site availability.
4Object-affected harmful factors
If radiation treatment is applied to allograft tissue to improve sterility, then pathogen transmission is reduced, but osteoinductivity and fracture energy are reduced
Solution Approach 1:
The patent extracts bone cells from allograft bone through decellularization processes, separating the cellular components (which contain growth factors) from the mineralized bone matrix. The extracted devitalized cells are then incorporated into a synthetic scaffold, eliminating the need for radiation treatment of the entire allograft. This extraction approach achieves sterility without compromising the mechanical properties of the final implant, as the synthetic scaffold provides the necessary structural strength.
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 biomimetic scaffold provides a safe, mechanically stable, and osteoinductive grafting material that stimulates constructive immune responses and promotes tissue regeneration, reducing the need for multiple surgeries and improving healing outcomes for large skeletal defects.
Implementation Method 1
A biomimetic scaffold can include a porous synthetic substrate and a plurality of devitalized cells incorporated in/on the substrate
Implementation Method 2
the substrate can be a fibrous sheet-like substrate formed of a plurality of fibers, e.g., electrospun fibers
Implementation Method 3
the devitalized cells can include stem cells and/or differentiated cells that can function as a depot for sustained release of beneficial active agents, e.g., cytokines
Data Source
AI summary
Biomimetic scaffolds are described that incorporate devitalized cells that can function as a depot for the release of cell and tissue supporting factors. Methods for forming the biomimetic scaffolds are also described. The biomimetic scaffolds can be bone tissue biomimetic scaffolds and the devitalized cells of the scaffolds can serve as sustained release depots for osteogenic and bone-forming factors. The biomimetic scaffolds can be particularly beneficial as grafting materials for reconstruction of large (e.g., greater than about 0.5 mm3) skeletal injuries.