Self-integrating Hydrogels for Bone-Cartilage Tissue Regeneration
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Solution Overview
Problem
Regenerative medicine faces challenges in regenerating tissue complexes composed of multiple types of tissue, as existing scaffolding materials and drug delivery mechanisms struggle to seamlessly integrate and regenerate spatially defined regions of different tissues effectively.
Innovation Solution
Development of self-integrating supramolecular hydrogels formed from water-soluble polymers modified with ureido-pyrimidinone units, which exhibit shear-thinning properties, allowing for injectable and self-healing capabilities, enabling the integration of different cell types and biomolecules to form complex tissue structures without external stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing scaffolding materials and drug delivery mechanisms are used, then tissue regeneration can be achieved, but seamless integration of multiple tissue types cannot be achieved
Solution Approach 1:
The invention divides the tissue complex into spatially defined regions with different tissue types, each region containing appropriate cells and biomolecules within the hydrogel matrix. This segmentation allows each tissue type to be optimized independently while achieving seamless integration through the self-integrating hydrogel properties.
Solution Approach 2:
The hydrogel system serves multiple functions simultaneously: it acts as a scaffolding material for structural support, a drug delivery mechanism for controlled biomolecule release, and a self-integrating matrix for seamless tissue integration. This multi-functionality enables a single system to address all regeneration needs of complex tissue structures.
2Ease of operation
If traditional scaffolding materials are used, then structural support can be provided, but injectable and self-healing capabilities cannot be achieved
Solution Approach 1:
The hydrogel exhibits dynamic mechanical properties that allow it to transition between liquid and gel states. Under shear stress during injection, the hydrogel flows like a liquid, but upon injection and removal of stress, it self-heals and recovers its gel structure, providing both injectability and structural integrity.
Solution Approach 2:
The invention utilizes changes in physical parameters (viscosity, gel strength) of the hydrogel system to achieve different functional states. By controlling parameters such as crosslinking density and polymer concentration, the hydrogel can be tuned to exhibit liquid-like behavior during injection and gel-like behavior during tissue support.
3Extent of automation
If external stimuli are used for integration, then controlled assembly can be achieved, but self-integrating capability without external stimuli cannot be achieved
Solution Approach 1:
The hydrogel system possesses intrinsic self-integrating properties that allow it to automatically assemble and integrate tissue components without requiring external stimuli or complex control systems. The supramolecular interactions and shear-thinning behavior enable the hydrogel to self-organize into the desired tissue structure autonomously.
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 hydrogels facilitate the regeneration of bone-cartilage tissue complexes and other tissue types by allowing seamless integration and sustained release of biomolecules, demonstrating potential for engineering various tissue complexes with enhanced biocompatibility and therapeutic efficacy.
Implementation Method 1
The repeating unit is a biocompatible monomer or comonomer, and the pendant chain includes a unit with multiple hydrogen bonds
Implementation Method 2
exhibit shear-thinning properties, allowing for injectable and self-healing capabilities
Data Source
Figure 1A~2
Figure 3~4
Figure 5A~5D
AI summary
A self-integrating hydrogel includes a water-soluble polymer. The water-soluble polymer includes a repeating unit having at least one functional group that includes an oxygen atom, a sulfur atom, or a nitrogen atom, and a pendant chain covalently attached to the oxygen atom, the sulfur atom, or the nitrogen atom of the at least one functional group of the repeating unit. The pendant chain includes ureido-pyrimidinone.