Perfusion Bioreactor with Tissue Flow Control and Live Imaging
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Solution Overview
Problem
Current tissue engineering techniques face challenges in optimizing the properties of complex-shaped, multi-phase tissues for implantation and scientific research, particularly in maintaining cell viability and extending the shelf life of tissues like osteochondral allografts, which have limited availability and short shelf life due to difficulties in controlled fluid distribution and imaging compatibility.
Innovation Solution
A bioreactor culture chamber system comprising a scaffold, PDMS block, and fluid routing manifolds with channels designed for controlled fluid distribution, allowing for perfusion of multiple culture media and real-time imaging without interrupting the culture, using materials like silicone and plastics for compatibility with imaging machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tissue engineering techniques are used for complex-shaped tissues, then manufacturing simplicity is maintained, but cell viability and tissue quality are insufficient
Solution Approach 1:
The bioreactor is divided into distinct functional modules: a scaffold module for tissue growth, a fluid distribution module with manifolds and channels for controlled perfusion, and an imaging module with transparent walls. This segmentation allows each module to be optimized independently while maintaining overall system functionality, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The fluid distribution channels are embedded within the scaffold structure itself, with manifolds integrated into the bioreactor walls. This nesting approach reduces the number of separate components and simplifies the overall device architecture while maintaining the complex fluid distribution functionality needed for high cell viability.
2Loss of information
If opaque materials are used in bioreactor construction, then manufacturing ease is maintained, but imaging capability is lost
Solution Approach 1:
The bioreactor walls are constructed from transparent materials specifically at regions where imaging is required, while other components may use different materials optimized for their specific functions. This local application of transparency allows imaging capability without compromising the overall manufacturing feasibility or structural integrity of the device.
3Reliability
If uniform fluid distribution is applied to all scaffold regions, then system simplicity is maintained, but tissue quality optimization is limited
Solution Approach 1:
The fluid distribution system incorporates channels with varying diameters, lengths, and configurations that are specifically designed to deliver optimized flow rates to different regions of the scaffold. This allows each region to receive the precise amount and type of culture media needed for optimal tissue quality, rather than applying uniform distribution throughout.
Solution Approach 2:
The bioreactor system allows for dynamic adjustment of fluid flow parameters, enabling the perfusion regime to be changed during tissue cultivation. This dynamic control allows optimization of tissue quality at different stages of development without requiring a completely different device design.
4Loss of information
If culture interruptions occur for imaging, then imaging data is obtained, but cell viability and tissue health deteriorate
Solution Approach 1:
The bioreactor is designed with transparent walls and integrated imaging capabilities that allow continuous observation of tissue growth without requiring opening or disassembling the device. Culture media perfusion continues uninterrupted during imaging, maintaining cell viability while obtaining real-time imaging data. The system enables simultaneous perfusion and imaging operations.
Data Source
AI summary
A perfusion bioreactor chamber for engineering a broad spectrum of tissues. The bioreactor allows controlled distribution of fluid through or around scaffolding materials of various shapes, structures and topologies during prolonged periods of cultivation.