PEG Crosslinked Hydrogel Bioink for 3D Bioprinting
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Solution Overview
Problem
Current hydrogel 3D printing technologies face challenges in forming self-supporting structures due to low viscosity of hydrogel precursor solutions, which result in poor structural definition and incompatibility with multi-layer printing, and existing strategies like high polymer concentrations or co-printing with support inks have limitations such as inhibiting cell spreading and proliferation or causing nozzle clogging.
Innovation Solution
Development of crosslinked hydrogel compositions comprising a biocompatible polymer, functionalized polyethylene glycol as a crosslinker, and optionally cells or bioactive factors, which transition from a low-viscosity solution to a self-supporting gel phase during extrusion, allowing for the formation of 3D structures that retain shape and integrity without requiring a supporting structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel precursor solutions are used for 3D printing, then cell encapsulation and biological compatibility are improved, but structural definition and self-supporting capability deteriorate due to low viscosity
Solution Approach 1:
The patent applies preliminary action by pre-crosslinking the hydrogel precursor solution to form a gel phase bioink before the printing process. This pre-gelation provides the necessary structural support and shape fidelity while maintaining cell encapsulation, resolving the contradiction between biological compatibility and structural definition.
Solution Approach 2:
The patent changes the physical state parameter of the bioink from liquid solution to gel phase through controlled crosslinking. This parameter change increases viscosity and provides self-supporting capability while preserving the biocompatible nature of the hydrogel matrix for cell encapsulation.
2Manufacturing precision
If polymer concentration is increased to improve structural definition, then shape fidelity is improved, but cell spreading, migration, and proliferation are inhibited
Solution Approach 1:
The patent changes the physical state parameter of the bioink from liquid solution to gel phase through controlled crosslinking. This parameter change increases viscosity and provides self-supporting capability while preserving the biocompatible nature of the hydrogel matrix for cell encapsulation.
3Strength
If post-printing cross-linking is performed to improve gel strength, then structural integrity is improved, but layer definition deteriorates due to rapid solution diffusion
Solution Approach 1:
The patent applies preliminary action by pre-crosslinking the hydrogel precursor solution to form a gel phase bioink before the printing process. This pre-gelation provides the necessary structural support and shape fidelity while maintaining cell encapsulation, resolving the contradiction between biological compatibility and structural definition.
4Manufacturing precision
If rapid cross-linking is performed to improve layer definition, then strand definition is improved, but nozzle clogging and poor inter-layer adhesion occur
Solution Approach 1:
The patent applies preliminary action by pre-crosslinking the hydrogel precursor solution to form a gel phase bioink before the printing process. This pre-gelation provides the necessary structural support and shape fidelity while maintaining cell encapsulation, resolving the contradiction between biological compatibility and structural definition.
5Ease of operation
If conventional solution phase bioinks are used, then ease of extrusion is improved, but multi-layer printing compatibility deteriorates
Solution Approach 1:
The patent changes the physical state parameter of the bioink from liquid solution to gel phase through controlled crosslinking. This parameter change increases viscosity and provides self-supporting capability while preserving the biocompatible nature of the hydrogel matrix for cell encapsulation.
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 method enables the creation of well-defined, self-supporting 3D structures with controlled mechanical properties, suitable for cell growth scaffolds, that maintain cell viability and allow for intricate, porous structures with fine features, overcoming the limitations of existing hydrogel printing techniques.
Implementation Method 1
the crosslinks between the biocompatible polymer chains comprise repeating units having the following structure
Implementation Method 2
transition from a low-viscosity solution to a self-supporting gel phase during extrusion
Data Source
AI summary
Extrudable hydrogel compositions for printing 3D objects, such as cell growth scaffolds, are provided. Also provided are methods for making the crosslinked hydrogel compositions and the printed objects and methods for culturing cells using the cell growth scaffolds. The hydrogel precursor solutions are aqueous solutions comprising a biocompatible polymer, functionalized polyethylene glycol as a crosslinker and, optionally, cells and/or bioactive factors.