Reversible Stencils for 3D Micro-Tissue Fabrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current animal-based tests for assessing the toxicity of chemical substances are costly, time-consuming, and ethically questionable, and lack predictive accuracy for human effects, while existing in vitro heart models are limited by short functional utility and difficulty in isolating cells for testing.
Innovation Solution
A device and method using a cell adhesion substrate with a removable elastomeric stencil overlay to confine and align mammalian cells, facilitating their self-assembly into three-dimensional micro-tissues that accurately model human cardiac function, allowing for high-throughput drug screening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If animal-based tests are used for toxicity assessment, then the tests can be performed with established protocols, but they are costly, time-consuming, ethically questionable, and lack predictive accuracy for human effects
Solution Approach 1:
The patent creates in vitro human tissue models that copy and replicate the functional and structural properties of actual human tissues. These models include human cardiac tissue, liver tissue, and other organ-specific tissues cultured in three-dimensional configurations that mimic in vivo conditions, providing a human-relevant copy for toxicological testing without using animals
Solution Approach 2:
The patent employs disposable microwell plates and single-use tissue models that can be quickly generated and discarded after a single testing cycle. These short-lived but highly effective models eliminate the need for maintaining long-term animal colonies and allow for rapid, cost-effective high-throughput screening of multiple test substances
2Reliability
If in vitro 3D-cardiac tissue constructs are used, then they exhibit contractile properties and action potentials, but they require large numbers of cells, long periods of time to make tissues, and have only short-lived functional utility
Solution Approach 1:
The patent segments the tissue formation process into controlled stages using microwell plates with specific geometric configurations. The microwells provide defined three-dimensional spaces that guide cell aggregation and tissue formation, enabling rapid generation of functional cardiac tissue constructs in a standardized, reproducible manner that reduces overall formation time
Solution Approach 2:
The patent optimizes multiple parameters including microwell geometry, cell density, culture medium composition, and oxygenation levels to accelerate tissue formation. By carefully controlling these parameters, the system achieves rapid differentiation and maturation of cardiac tissue constructs with functional contractility and electrophysiological properties in significantly reduced timeframes
3Reliability
If in vitro 3D-cardiac tissue constructs are used, then they can model cardiac function, but it is difficult to isolate cells from currently available constructs to perform single cell physiological tests
Solution Approach 1:
The microwell plate design physically segments the tissue into discrete, isolated units. Each microwell contains a separate tissue construct that can be individually accessed, harvested, and processed. This segmentation enables easy isolation of cells from specific tissue constructs without disrupting other samples, facilitating single-cell physiological tests while maintaining tissue-level functional data
Solution Approach 2:
The microwell structure serves as an intermediary between the tissue construct and the isolation process. The well walls provide a defined interface that allows for controlled tissue harvesting and cell release, acting as a mediator that preserves tissue integrity during culture while enabling straightforward cell isolation for downstream single-cell analyses
4Reliability
If tissue models are generated for extensive safety and efficacy testing, then they should be three-dimensional with appropriate physico-chemical properties, but they must be available in sufficient numbers for statistically relevant studies
Solution Approach 1:
The patent merges multiple tissue constructs into a single microwell plate platform, allowing simultaneous generation and maintenance of numerous identical or varied tissue models in one device. This consolidation enables high-throughput production of statistically relevant numbers of tissue models while maintaining their three-dimensional architecture and physico-chemical properties through standardized culture conditions
Solution Approach 2:
The micrawell plate design serves multiple functions: it provides three-dimensional tissue formation spaces, enables high-density parallel culture of numerous constructs, facilitates automated media exchange and compound delivery, and allows for easy harvesting and analysis. This multi-functionality simultaneously achieves complex tissue physiology with high productivity and statistical power
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 solution enables the rapid generation of clinically relevant, three-dimensional tissue models that exhibit beating frequency, electrical activity, and drug responses similar to human cardiac tissue, supporting efficient and accurate pharmacological and toxicity testing.
Implementation Method 1
a cell adhesion substrate
Implementation Method 2
induce the self-assembly of the mammalian cells into one or more micro-tissues
Data Source
AI summary
The invention relates to devices, methods, kits, and compositions for in vitro generation of three-dimensional micro-tissues that are accurate models of heart, skeletal muscle, neuronal, and other tissues.