Textured Microfluidic Channel for High-Yield Platelet Production
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Solution Overview
Problem
Current methods for producing platelets from megakaryocytes are inefficient for large-scale production and fail to maintain the functional qualities of the produced platelets.
Innovation Solution
A fluidic device with a textured channel surface, coated with von Willebrand factor, is used to enhance the capture and shedding of megakaryocytes into platelets, improving yield and maintaining functional qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bioreactors with porous structures or slits are used to trap megakaryocytes, then platelet production can be achieved, but the number of sites available for megakaryocytes is limited and many cells stay stuck in the reservoir, limiting the speed of platelet production
Solution Approach 1:
The invention transitions from conventional 2D surface trapping (porous structures or slits) to 3D volumetric trapping using hydrodynamic focusing. Megakaryocytes are concentrated into a narrow core flow region where they are trapped by flow dynamics rather than physical barriers, enabling three-dimensional utilization of the channel volume for cell trapping and platelet production.
Solution Approach 2:
The invention removes the physical porous structures or slits from the bioreactor design and replaces them with flow-based trapping mechanisms. This extraction of solid trapping structures eliminates the limitation of limited trapping sites while maintaining effective megakaryocyte capture through hydrodynamic forces.
2Quantity of substance
If conventional bioreactors are used for platelet production, then some platelet production is achieved, but the production yields are still not sufficient for functional characterization
Solution Approach 1:
The invention implements continuous flow through the microfluidic device, ensuring that megakaryocytes continuously pass through the trapping region and shed platelets. This continuous action replaces batch processing, maintaining constant production rates and achieving higher cumulative yields suitable for functional characterization studies.
Solution Approach 2:
The invention uses dynamic flow control to adjust shear rates and flow velocities, optimizing megakaryocyte trapping efficiency and platelet shedding rates. By dynamically adjusting flow parameters rather than using fixed structures, the system maximizes platelet production yield while maintaining cell viability and function.
3Productivity
If shear stress is applied to megakaryocytes in conventional bioreactors, then platelet shedding is induced, but the main flow remains free of megakaryocytes and many cells are lost in the reservoir
Solution Approach 1:
The invention segments the flow into distinct regions: a narrow core flow region where megakaryocytes are trapped and shed platelets, and outer flow regions that carry away released platelets. This segmentation prevents megakaryocytes from being lost in the main flow while maintaining efficient platelet shedding through localized shear stress application.
Solution Approach 2:
The invention creates localized high shear stress regions only where needed for platelet shedding, rather than applying shear stress uniformly throughout the entire flow. By concentrating shear stress application to specific trapping zones, the system induces platelet shedding efficiently while minimizing megakaryocyte loss in other regions.
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 device achieves high-yield platelet production while maintaining the functional aspects of natural platelets, making it suitable for large-scale production and therapeutic applications.
Implementation Method 1
The channel is textured on at least one portion of its inner surface to modify the distance between neighboring streamlines allowing the capture of flowing megakaryocytes on the surfaces of obstacles and/or on the inner surface of the channel
Implementation Method 2
expose them to shear so as to induce platelet shedding
Data Source
Figure 1~2
Figure 3a~3c
Figure 4a~4c
AI summary
The invention relates to a fluidic device for producing platelets from a suspension of megakaryocytes or their fragments, comprising a production chamber comprising at least one channel in which a suspension of megakaryocytes is introduced to flow from its inlet to its outlet wherein said channel is textured with a plurality of obstacles on at least one portion of its inner surface. The invention is further directed to an ex vivo method for producing platelets from megakaryocytes using a fluidic device as defined above.