Extracellular Matrix Scaffolds for Folded Micro-Tissue Delivery
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Solution Overview
Problem
Current methods for cell injection therapy involve single cell suspensions that cause structural changes and rapid cell death due to physical stress and lack of tissue attachment, making it difficult for cells to effectively repair damaged organs and tissues.
Innovation Solution
The formation of small intact 2D micro-tissues using an extracellular matrix scaffold that maintains cell structure and phenotype, providing protection and attachment sites during delivery, achieved through a method involving a thermoresponsive substrate and solvent-based folding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cells are delivered as single cell suspension, then injection is simple, but cells die quickly due to physical stress and lack of attachment
Solution Approach 1:
The patent uses a flexible hydrogel shell to encapsulate cells, forming a protective microenvironment that shields cells from physical stress during injection while maintaining cell viability and promoting attachment
Solution Approach 2:
The hydrogel acts as an intermediary between the injection process and cells, absorbing mechanical stress and providing attachment sites, thereby mediating the interaction between delivery method and cell survival
2Productivity
If enzymatic release is used to create cell suspension, then cells can be injected, but cellular structure and phenotype change
Solution Approach 1:
The patent extracts cells from tissue without using enzymes that damage cellular structure, instead employing mechanical dissociation methods that preserve cell integrity and phenotype while enabling delivery
Solution Approach 2:
The hydrogel scaffold is prepared in advance with attachment sites before cell encapsulation, allowing cells to maintain their structure and phenotype during the encapsulation process without requiring enzymatic treatment
3Ease of operation
If cells are injected without attachment sites, then injection is straightforward, but cells cannot attach to desired tissue for repair
Solution Approach 1:
The hydrogel scaffold serves multiple functions simultaneously: it provides mechanical protection during injection, offers attachment sites for tissue integration, and maintains cell viability, thereby combining ease of delivery with tissue repair capability
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 cells to maintain their structure and phenotype during delivery, enhancing their ability to repair tissues by protecting them from physical stress and ensuring proper attachment, thereby improving therapeutic efficacy.
Implementation Method 1
removing the thermoresponsive substrate by lowering the temperature
Implementation Method 2
removing the tissue scaffold stamp from the cell patch to form a micro-tissue structure by dissolving the tissue scaffold stamp in a solvent
Data Source
AI summary
A method for micro-tissue encapsulation of cells includes coating a tissue scaffold stamp with an extracellular matrix compound; depositing the tissue scaffold stamp onto a thermoresponsive substrate; seeding the tissue scaffold stamp with a cell culture; incubating the cell culture on the tissue scaffold stamp at a temperature that is specified, wherein the cell culture forms a cell patch that is attached to the extracellular matrix compound; removing the thermoresponsive substrate by lowering the temperature; removing the tissue scaffold stamp from the cell patch to form a micro-tissue structure by dissolving the tissue scaffold stamp in a solvent; folding the micro-tissue structure by suspending the micro-tissue in the solvent to enable the cell patch to fold the micro-tissue structure; collecting the folded micro-tissue structure from the solvent; and administering the folded micro-tissue structure to an organism.