Cleavable Bioink Composition for DLP Soft Tissue Bioprinting
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Solution Overview
Problem
Existing DLP bioprinting technologies face challenges in balancing mechanical properties and biological compatibility for soft tissue fabrication, resulting in limited structural complexity and cellular functionality.
Innovation Solution
A bioink formulation combining hyaluronic acid methacrylate (HAMA) with gelatin methacryloyl (GelMA) is used, followed by enzymatic digestion to achieve tissue-matching mechanical properties and structural complexity, enabling precise bioprinting of soft tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strong mechanical properties are provided in bioink to aid filament deposition and layer-by-layer lifting in DLP bioprinting, then printing fidelity is improved, but cellular functions including cell spreading, proliferation, and differentiation are limited
Solution Approach 1:
The invention divides the bioink into two distinct polymer components: a cleavable polymer (e.g., hyaluronic acid-based) that provides initial mechanical strength for printing, and a non-cleavable polymer (e.g., gelatin-based) that supports cellular functions. This segmentation allows each polymer to fulfill its specific role without compromising the other.
Solution Approach 2:
The cleavable polymer performs a preliminary function by providing the mechanical strength needed during the bioprinting process. After printing is complete, this polymer is enzymatically degraded, transferring the structural support role to the non-cleavable polymer, which then enables cellular functions.
Solution Approach 3:
The mechanical properties of the bioink are dynamically changed through enzymatic degradation of the cleavable polymer component. The bioink transitions from a high-strength state during printing to a softer, more cell-friendly state after printing, achieving both printing fidelity and cellular functionality at different time points.
2Adaptability or versatility
If soft mechanical properties are provided in bioink to support cellular functions, then cell spreading and proliferation are improved, but the mechanical strength is insufficient to facilitate the bioprinting process
Solution Approach 1:
The bioink is segmented into two polymer systems with complementary properties: the cleavable polymer contributes to mechanical strength while the non-cleavable polymer provides cellular bioactivity. This segmentation allows the formulation to meet both mechanical and biological requirements simultaneously.
Solution Approach 2:
The invention creates a composite bioink material combining two不同类型的 polymers with distinct functions. The cleavable polymer (e.g., hyaluronic acid methacrylate) provides structural integrity, while the non-cleavable polymer (e.g., gelatin methacryloyl) provides cellular compatibility, achieving synergistic effects.
3Manufacturing precision
If high mechanical properties are used in DLP bioprinting to achieve volumetric constructs, then structural complexity is improved, but cytocompatibility is reduced
Solution Approach 1:
The cleavable polymer performs a preliminary structural support function during the bioprinting of volumetric constructs. After printing, enzymatic degradation removes this temporary structural element, eliminating its cytocompatibility issues while preserving the printed structure through the non-cleavable polymer network.
Solution Approach 2:
The mechanical properties and cytocompatibility of the bioink are dynamically adjusted through enzymatic degradation. The system transitions from high mechanical strength (good for printing complex structures) to high cytocompatibility (good for cell viability), achieving both structural complexity and cellular health.
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 allows for the bioprinting of soft tissues with tunable mechanical properties and enhanced cellular functions, supporting the growth and differentiation of various cell types, including hepatocytes, myoblasts, and neural progenitor cells.
Implementation Method 1
repeatedly photoactivating the biocompatible polymer precursors in the 3D bioprinter vat on a build plate immersed in the vat to form a 3D bioprinted object comprising polymers
Implementation Method 2
treating the 3D bioprinted object with an agent that cleaves chemical bonds within the cleavable polymer
Data Source
AI summary
A bioink formulation for digital light processing bioprinting comprising a mixture of a biocompatible cleavable polymer precursor, a biocompatible non-cleavable polymer precursor, and a photoinitiator is described. Three-dimensional (3D) objects prepared using these bioink formulations are also described. In addition, a method of 3D bioprinting is described. The method includes providing a bioink formulation in a 3D bioprinter vat; repeatedly photoactivating the biocompatible photoactive polymer precursors in the 3D bioprinter vat on a build plate immersed in the vat to form a 3D bioprinted object comprising polymers having a series of predefined shapes across the vertical direction based on a set of sliced images; and treating the 3D bioprinted object with an agent that cleaves chemical bonds within the cleavable polymer.