Bioink Extrusion for Cell Spheroid Patterning
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Solution Overview
Problem
Existing methods for manufacturing cell spheroids are cumbersome, require complex micromachining processes, and face challenges in adjusting sizes and harvesting, with limited accuracy and convenience in medium exchange, especially when trying to create complex three-dimensional structures.
Innovation Solution
A method involving the extrusion of a bioink, including cells, into a hydrogel matrix using a needle nozzle, with controlled extrusion amounts and paths to form cell spheroids, allowing for the creation of complex three-dimensional structures by patterning cell spheroids on a hydrogel through a hybrid bioprinting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microwell methods are used to manufacture cell spheroids, then cell spheroids can be formed, but complicated and long micromachining processes such as photolithography and soft-lithography are required
Solution Approach 1:
The patent extracts the cell spheroid formation process from the complex micromachining system by using a simple needle nozzle to inject bioink containing cells directly into a hydrogel matrix. This eliminates the need for photolithography and soft-lithography processes while still achieving precise cell spheroid formation through controlled bioink extrusion and calcium chloride-induced gelation.
Solution Approach 2:
The patent changes the physical-chemical parameters of the bioink by incorporating calcium chloride as a crosslinking agent. When calcium chloride is added to the alginate-based bioink, it undergoes gelation to form a stable hydrogel matrix that encapsulates cells and enables spheroid formation. This parameter change simplifies the manufacturing process while maintaining precision.
2Manufacturing precision
If existing cell spheroid manufacturing methods are used, then cell spheroids can be produced, but there are limitations in adjusting the sizes of cell spheroids
Solution Approach 1:
The patent introduces dynamic control over cell spheroid size by adjusting the extrusion parameters of the bioink through the needle nozzle. The size of cell spheroids can be dynamically controlled by modifying the extrusion volume, extrusion speed, and bioink composition, allowing flexible adaptation to different size requirements without changing the fundamental manufacturing process.
3Manufacturing precision
If cell spheroids are manufactured by culturing cells in hanging drops or on non-attached surfaces, then cell spheroids can be formed, but it is not easy to harvest manufactured cell spheroids
Solution Approach 1:
The patent uses a hydrogel matrix as an intermediary substance that temporarily holds the cell spheroids during the manufacturing process. The hydrogel acts as a removable scaffold that can be easily separated from the cell spheroids through enzymatic degradation or physical removal, enabling simple harvesting while maintaining precise spheroid formation during culture.
4Productivity
If conventional cell culture methods are used, then cells can be cultured, but exchanging cell culture medium is inconvenient and cells may be lost
Solution Approach 1:
The patent merges the cell culture function with the hydrogel matrix structure, creating a integrated system where cells are embedded within the hydrogel. This allows the hydrogel to serve as both the culture substrate and the containment structure, enabling convenient medium exchange through the hydrogel matrix while preventing cell loss through the matrix's physical barrier properties.
5Productivity
If separate manufacturing of cell spheroids followed by bio-printing is used, then macro artificial tissues can be manufactured, but complex computer imaging and robotics systems are required
Solution Approach 1:
The patent combines the cell spheroid manufacturing process with the bio-printing process into a single integrated operation. The needle nozzle directly extrudes bioink containing cells into the hydrogel matrix during the same process step, eliminating the need for separate manufacturing and printing steps. This integration reduces device complexity while maintaining the ability to create complex macro artificial tissues.
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 precise control over cell spheroid size, position, and spacing, facilitating the formation of complex three-dimensional structures with high cell viability and metabolic activity, suitable for tissue regeneration and drug development applications.
Implementation Method 1
adding a calcium chloride (CaCl2) solution to the alginate included in the first bioink
Implementation Method 2
dissolving the second bioink, present in the first bioink, in a cell culture medium to form a cell spheroid from the cells
Data Source
AI summary
Disclosed is a process of manufacturing cell spheroids using a bioink. More particularly, provided is a method of manufacturing a cell spheroid, the method including extruding a first bioink including an alginate; extruding a second bioink including cells into the extruded first bioink; adding a calcium chloride (CaCl2) solution to the alginate included in the first bioink; and dissolving the second bioink, present in the first bioink, in a cell culture medium to form a cell spheroid from the cells.