Bioactive Granular Hydrogel Scaffolds for Light-Free Regeneration
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Solution Overview
Problem
Existing hydrogel scaffolds require light exposure for crosslinking, limiting their use in tissues without access to light and hindering noninvasive or minimally invasive tissue regeneration.
Innovation Solution
Forming hydrogel microparticles via chemical crosslinking and assembling them using orthogonal, non-light-mediated methods, allowing for the creation of stable granular hydrogel scaffolds that can be injected into tissues and assemble without light exposure, incorporating biologics and mimicking native tissue characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-mediated crosslinking is used to form hydrogel scaffolds, then crosslinking efficiency and scaffold stability are improved, but applicability to tissues without light access and minimally invasive procedures deteriorates
Solution Approach 1:
The patent replaces light-mediated crosslinking (optical/chemical system) with enzyme-mediated crosslinking (biological system). Microgels are functionalized with enzyme substrates that, when exposed to specific enzymes in the target tissue, trigger crosslinking and scaffold formation without requiring light exposure. This enables scaffold formation in dark or deep tissues while maintaining structural stability.
Solution Approach 2:
The patent introduces enzymes as intermediary agents that mediate the crosslinking process. The microgels contain enzyme substrates (e.g., peptide sequences) that serve as intermediaries between the microgel particles and the crosslinking reaction. When enzymes encounter these substrates in the target tissue, they catalyze the crosslinking reaction, enabling scaffold formation without direct light exposure.
2Manufacturing precision
If open surgery is used to implant hydrogel scaffolds, then scaffold placement precision is improved, but invasiveness and patient morbidity worsens
Solution Approach 1:
The patent divides the scaffold into numerous small microgels (1-100 micrometers) that can be injected as a suspension through minimally invasive routes. The microgels maintain individual stability but can self-assemble into a cohesive scaffold structure in situ, combining the benefits of minimally invasive delivery with precise scaffold placement.
Solution Approach 2:
The patent performs preliminary functionalization of microgels with enzyme substrates and crosslinkable groups before injection. This preliminary preparation enables the microgels to automatically crosslink and form a stable scaffold structure once they reach the target tissue and encounter the appropriate enzymes, eliminating the need for surgical implantation while ensuring precise placement.
3Reliability
If complex multi-step crosslinking is used to form stable scaffolds, then scaffold stability is improved, but process complexity and time required worsens
Solution Approach 1:
The patent combines multiple crosslinking mechanisms into a unified enzyme-mediated process. Microgels are functionalized with both enzyme substrates and crosslinkable groups that work together in a single enzymatic reaction step. The enzyme catalyzes both the recognition/binding of microgels and the crosslinking reaction simultaneously, simplifying the process while maintaining scaffold stability.
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 noninvasive or minimally invasive tissue regeneration by forming stable hydrogel scaffolds that enhance cell infiltration, viability, and tissue integration, promoting vascularization and tissue function improvement without open surgery.
Implementation Method 1
a polymer can be converted to stable microgels (micro-scale hydrogel particles) via chemical crosslinking
Implementation Method 2
followed by microgel-microgel assembly using orthogonal, non-light-mediated crosslinking
Data Source
AI summary
Embodiments relate to porous hydrogel microparticles, porous granular hydrogel scaffolds, and methods of making and using thereof. A method of making porous hydrogel microparticles includes crosslinking first polymers and second polymers to form composite microgels, adding the composite microgels to a liquid solution at a first temperature to form a composite microgel suspension, reducing the temperature of the composite microgel suspension to a second temperature below a phase separation temperature such that the second polymers separate from the first polymers, and filtering the composite microgel suspension from the liquid solution such that the second polymers diffuse out of the composite microgel suspension, resulting in the porous microgels.