Assembled Hydrogel Blocks for 3D Bioprinting Tissue Constructs
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Solution Overview
Problem
Current 3D bioprinting techniques face challenges in creating larger artificial tissue and organ constructs without causing hypoxia in cells, which can lead to reduced cell viability and functionality, and existing cell macro-encapsulation methods struggle with biodegradability and mechanical properties.
Innovation Solution
A 3D hydrogel scaffold is developed by assembling two hydrogel blocks with different biodegradabilities, where the first block contains cells and the second block is designed to degrade first, promoting angiogenesis and oxygen supply to the first block, thereby enhancing cell engraftment and viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the 3D construct is increased to enable larger artificial tissue and organ production, then the structural capacity and functional potential are improved, but the formation time and cell retention time during bioprinting are extended, leading to degraded cell viability and functionality
Solution Approach 1:
The patent divides the large-scale construct into multiple smaller hydrogel blocks that are printed separately and then assembled. This segmentation allows each block to be formed quickly with maintained cell viability, while the overall construct achieves the desired large size through assembly of these modular units.
2Stability of the object's composition
If cell macro-encapsulation is used to form artificial tissue and organs, then the structural organization is improved, but hypoxia occurs in the encapsulated cells, reducing cell viability
Solution Approach 1:
The patent employs hydrogel blocks with controlled porosity that allow oxygen and nutrient diffusion throughout the construct. This porous structure prevents hypoxia in encapsulated cells while maintaining the structural organization needed for artificial tissue and organ formation.
Solution Approach 2:
The patent uses composite hydrogel formulations that combine materials with different degradation rates and properties. These composite materials provide both structural stability and enhanced oxygen transport capabilities, preventing hypoxia while maintaining organizational integrity.
3Ease of manufacture
If a single hydrogel block is used for the entire construct, then the manufacturing process is simplified, but the biodegradability is uniform, preventing controlled tissue integration and angiogenesis
Solution Approach 1:
The patent applies local quality by assigning different biodegradability characteristics to different hydrogel blocks within the construct. Blocks in contact with host tissue use faster-degrading materials to promote tissue integration, while internal blocks use slower-degrading materials for structural support, creating spatially varying degradation properties.
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 scaffold allows for larger construct sizes with reduced risk of hypoxia, improved cell viability, and controlled biodegradability, maintaining structural integrity and promoting tissue integration.
Implementation Method 1
the first hydrogel block and the second hydrogel block are assembled with each other and have different biodegradabilities
Data Source
AI summary
A three-dimensional hydrogel scaffold of the present invention contains a cell to be transplanted in vivo and comprises a first hydrogel block on which a plurality of holes are formed and one or more second hydrogel blocks which are assembled to the holes and are biodegradable. A large hydrogel scaffold can be prepared by means of the assembly of the blocks. The survivability of the cell being transplanted is high and the biodegradability of the blocks varies, and thus the risk of hypoxia is reduced.