Bioreactor Perfusion for Personalized Bone Grafts
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Solution Overview
Problem
Current bone reconstruction methods using autologous tissue grafts face challenges such as limited availability, donor site morbidity, and difficulty in contouring complex three-dimensional shapes, which limits their effectiveness in treating bone defects.
Innovation Solution
A bioreactor system that utilizes image-based modeling to create anatomically-shaped scaffolds seeded with human mesenchymal stem cells, allowing for controlled perfusion of culture medium to guide cell differentiation and assembly into bone tissue, thereby producing personalized bone grafts with high shape fidelity and low risk of rejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autologous tissue grafting is used for bone reconstruction, then the risk of rejection is reduced, but the availability of suitable graft material is limited due to harvesting difficulties and donor site morbidity
Solution Approach 1:
The patent creates a copy of the patient's bone tissue by seeding autologous stem cells onto a scaffold that replicates the target bone's anatomical shape and porous structure. The scaffold serves as a template that guides tissue formation, producing a graft that mirrors the original bone architecture while being grown from the patient's own cells, thus maintaining low rejection risk while overcoming material availability limitations
Solution Approach 2:
The patent performs preliminary actions by harvesting and expanding stem cells from the patient's body before the actual bone reconstruction procedure. The cells are cultured and multiplied in advance, then seeded onto scaffolds that are pre-shaped to match the defect geometry. This preliminary cell preparation and scaffold fabrication allows sufficient graft material to be available when needed, overcoming the limitation of limited harvestable tissue
2Reliability
If autologous tissue is used for bone grafting, then rejection risk is reduced, but the ability to contour complex three-dimensional shapes is limited
Solution Approach 1:
The patent applies local quality by creating scaffolds with spatially varying porous structures that match the specific anatomical requirements of different regions of the bone defect. The scaffold architecture, pore size, and interconnectivity are tailored to local needs, enabling precise contouring of complex three-dimensional shapes while maintaining autologous cell seeding throughout the structure for low rejection risk
Solution Approach 2:
The patent transitions from traditional two-dimensional or simple three-dimensional graft shaping to complex multi-dimensional anatomical reconstruction. By using three-dimensional scaffolds with controlled porosity and interconnected pore networks that replicate native bone architecture, the system achieves precise contouring of intricate shapes that cannot be obtained through conventional harvesting and shaping methods
3Ease of manufacture
If traditional bone grafting methods are used, then surgical simplicity is maintained, but the ability to treat large or complex bone defects is limited
Solution Approach 1:
The patent creates a universal bone grafting system where autologous stem cells can be seeded onto various scaffold geometries to treat different types, sizes, and locations of bone defects. The same basic approach—cell harvesting, expansion, scaffold seeding, and implantation—can be applied universally across craniofacial, orthopedic, and other bone reconstruction applications, maintaining surgical simplicity while greatly expanding adaptability to complex and large defects
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 system enables the creation of viable, anatomically-shaped bone grafts with dense cellular growth and functional properties, suitable for craniofacial and orthopedic applications, by mimicking the architecture and interstitial flow of native bone, enhancing tissue development and mechanical properties.
Implementation Method 1
A bioreactor system that utilizes image-based modeling to create anatomically-shaped scaffolds seeded with human mesenchymal stem cells, allowing for controlled perfusion of culture medium to guide cell differentiation and assembly into bone tissue
Implementation Method 2
The flow mechanism can be configured to remove a perfusate from the at least one lumen and return it to the internal volume of the vessel
Data Source
AI summary
An anatomically-shaped, human bone graft may be cultivated ex vivo using a bioreactor capable of perfusing large complex porous scaffolds. Scaffolds derived from image-based modeling of a target are seeded with human mesenchymal stem cells and cultivated. A bioreactor configured to house complex three-dimensional scaffold geometries provides controlled flow for perfusion of the cells. Dense uniform cellular growth can be attained throughout the entire scaffold as a result of the medium perfusion. In an embodiment, the bioreactor has a mold into which perfusion medium is pumped under pressure and multiple ports through which the medium exits the mold.