Perfusion Bioreactor for Large Bone Grafts
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Solution Overview
Problem
Current methods for engineering large and geometrically complex bone grafts face challenges due to poor nutrient supply and metabolic waste removal in static cultures, and existing bioreactors struggle with perfusion of large bone substitutes, limiting the size and functionality of engineered tissue.
Innovation Solution
Customized perfusion bioreactors and cell culture scaffolds designed using medical imaging and computer-assisted design/manufacturing, allowing for direct perfusion and segmental additive tissue engineering to grow functional vascularized tissues like bone in vitro, with bioreactors tailored to specific tissue segments and scaffolds made from biocompatible materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static culture conditions are used to grow bone grafts, then the culture system is simple to operate, but nutrient supply and waste removal are insufficient leading to necrosis in large constructs
Solution Approach 1:
The patent transitions from static culture conditions to dynamic perfusion bioreactor systems that actively circulate culture medium through the bone graft constructs. This dynamic approach enables continuous nutrient supply and waste removal via convective flow, preventing necrosis in large constructs while maintaining operational feasibility through automated pump systems and standardized bioreactor designs.
2Volume of moving object
If large bone substitutes are engineered, then clinical applicability increases, but mass transport limitations cause nutrient gradients and cell migration to borders
Solution Approach 1:
The patent employs hydraulic perfusion systems where culture medium is pumped through porous bone graft substitutes under controlled pressure gradients. This forces convective flow through the entire construct volume, ensuring uniform nutrient distribution and preventing the formation of nutrient gradients that would otherwise cause cell migration to borders and necrosis in large constructs.
Solution Approach 2:
The patent utilizes porous bone graft substitute materials with optimized pore structures that allow efficient medium penetration and mass transport. The porous architecture enables convective flow to reach deep into the construct, supporting uniform cell survival and tissue formation throughout large-volume grafts while maintaining structural integrity.
3Device complexity
If traditional bioreactors are used, then the device design is simple, but they cannot provide adequate perfusion for large bone substitutes
Solution Approach 1:
The patent divides large bone graft requirements into manageable segments by using modular bioreactor systems and segmenting the perfusion process. Multiple smaller bioreactors can be used in parallel, or large grafts can be cultured in stages, allowing traditional simple bioreactor designs to be scaled up effectively while maintaining adequate perfusion and achieving clinical-grade tissue engineering output.
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
Enables the successful growth of large, functional bone grafts with improved nutrient distribution and viability, overcoming limitations of traditional bioreactors by facilitating segmental additive bone engineering and vascularization, potentially for clinical applications.
Implementation Method 1
mass transport occurs only via diffusion, which is not sufficient to support cell survival and proliferation inside the core of large cell/scaffold constructs
Implementation Method 2
mass transport occurs only via diffusion, which is not sufficient to support cell survival and proliferation inside the core of large cell/scaffold constructs
Data Source
AI summary
In some embodiments the present invention provides perfusion bioreactors and cell culture scaffolds suitable for the preparation of tissue grafts, such as bone tissue grafts. In some embodiments, the perfusion bioreactors comprise a graft chamber and/or a graft chamber insert configured to hold a tissue graft having a certain shape and/or certain dimensions, and/or to allow culture of such tissue grafts under press-fit direct perfusion conditions. In some embodiments, the perfusion bioreactors comprise an equilibration chamber.