Hydrogel Microwell Films for Cell Spheroid Culture

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Solution Overview

Problem

Current cell culture systems for high-throughput aggregation and long-term culture of cellular spheroids face limitations such as labor-intensiveness, scalability issues, and difficulty in medium exchange, with conventional systems like AggreWell™ exhibiting constraints in geometry, nutrient diffusion, and bioactivity, leading to uncontrolled lineage commitment and biased results.

Innovation Solution

A novel 3D culture system featuring high-aspect ratio round-bottom and U-bottom shaped microwells with low pitch sizes and high side walls, fabricated using hydrogel materials like PEG, allowing for customizable geometry, improved nutrient permeability, and integration of microfluidic networks for local delivery of bioactive molecules, enabling high-throughput formation and manipulation of cellular spheroids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional PDMS microwell systems are used for cell aggregation, then high-throughput production is achieved, but nutrient diffusion is limited and cell function is compromised

Engineering Contradiction:

Improvehigh-throughput productionVSAvoidnutrient diffusion limitation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs hydrogel materials with inherently porous structures that enable superior nutrient diffusion compared to conventional PDMS. The hydrogel matrix allows biomolecules and nutrients to penetrate effectively while maintaining the microwell architecture for high-throughput cell aggregation, thus resolving the contradiction between productivity and nutrient diffusion.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The invention uses composite hydrogel materials that combine the structural integrity needed for micrawell formation with the permeability characteristics required for efficient nutrient diffusion. This composite approach maintains high-throughput capability while eliminating the harmful effect of nutrient diffusion limitation present in pure PDMS systems.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If AggreWell™ pyramidal microwells are used, then standardized cell aggregation is achieved, but cell shape is constrained and biological function is affected

Engineering Contradiction:

Improvestandardized cell aggregationVSAvoidcell shape constraint

Core Design Contradiction:

Manufacturing precisionVSShape

Solution Approach 1:

The patent transitions from pyramidal micrawell geometry to spherical or U-shaped bottom geometries that allow cells to aggregate into natural spherical configurations. This curvature-based design maintains manufacturing precision for standardized aggregation while eliminating the shape constraint and unwanted lineage commitment induced by pyramidal structures.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Ease of operation

If large opening micrawells are used for medium exchange, then accessibility is improved, but spheroid disturbance occurs during handling

Engineering Contradiction:

Improvemedium exchange accessibilityVSAvoidspheroid stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent integrates microfluidic channels that approach the micrawells from lateral or bottom dimensions rather than requiring large top openings. This dimensional change allows medium exchange to occur through side ports while maintaining the integrity and stability of the spheroids, resolving the contradiction between ease of operation and reliability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Ease of manufacture

If PDMS material is used for micrawell fabrication, then ease of manufacture is achieved, but biomolecule absorption occurs and results are biased

Engineering Contradiction:

Improvemicrawell fabricationVSAvoidbiomolecule absorption

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent changes the material parameter from PDMS to hydrogel, fundamentally altering the chemical properties to eliminate biomolecule absorption while maintaining ease of manufacture. The hydrogel material provides a biocompatible surface that does not adsorb biomolecules, thus removing the harmful effect while preserving manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

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 system enables reproducible, scalable, and long-term culture of cellular spheroids with enhanced cellular function, allowing for precise control over cell aggregation and bioactive molecule delivery, thereby improving the relevance of cell culture models to in vivo environments and facilitating high-resolution screenings.

Implementation Method 1

improved nutrient permeability

Methodology Applied

Scientific EffectDiffusion: Diffusion

Implementation Method 2

integration of microfluidic networks for local delivery of bioactive molecules

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS11583860B2Microstructured thin hydrogel films

Publication Date: 2023.02.21 ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)

AI summary

A device for aggregating cells includes a cavity. The cavity includes a plurality of microwells for receiving at least one cell. Each of the microwells includes a vertical sidewall and a curved bottom. The microwells are made in a hydrogel layer. Each of said microwells has a diameter and an interwell distance between one microwell and another microwell, wherein a ratio for the interwell distance to the diameter is less than or equal to 1/10.