Porous Microcarrier Beads with Protective Shell for Cell Growth

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Solution Overview

Problem

Current microcarrier beads and tissue engineering scaffolds face challenges in supporting anchorage-dependent cell growth in agitated conditions due to insufficient protection from fluid motion and oxygenation, and they lack controllable pore structures and biomaterial incorporation methods that preserve viability.

Innovation Solution

The development of microcarrier beads with a porous three-dimensional core and an outer protective layer, fabricated using precision extrusion deposition, providing high porosity and interconnected pores for enhanced cell growth and nutrient transfer, along with a method for creating artificial scaffolds with customizable porosity and biomaterial incorporation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If microcarrier beads are made porous to support anchorage-dependent cell growth, then cell attachment and growth area are improved, but structural strength and protection from fluid motion are reduced

Engineering Contradiction:

Improvecell growth surface areaVSAvoidbead structural strength

Core Design Contradiction:

Area of stationary objectVSStrength

Solution Approach 1:

The microcarrier bead is segmented into multiple functional layers: an outer protective shell layer providing mechanical strength and shear protection, and an inner porous core layer providing cell attachment surface area. This segmentation allows each layer to specialize in one function, resolving the contradiction between strength and surface area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bead uses composite material structure combining a protective outer shell material with an inner porous core material. The composite structure integrates the protective function of the shell with the cell-growth function of the porous core, simultaneously achieving both structural strength and high cell attachment area.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If bioreactor agitation is increased to improve oxygen transfer, then dissolved oxygen levels are improved, but cell damage from shear stress and bubbles increases

Engineering Contradiction:

Improvedissolved oxygenVSAvoidshear stress and bubble damage

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The outer protective shell is applied beforehand to cushion and protect the cells from harmful shear stress and bubble impacts before they occur during agitation. This pre-protection allows the system to withstand higher agitation levels needed for oxygen transfer without damaging the cells.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The porous core structure allows efficient oxygen diffusion to cells while the outer protective shell filters and protects from harmful bubbles. The porous material enables oxygen transfer without requiring direct bubble-cell contact, reducing mechanical damage.

Inventive Principle:

Principle #31Porous materials

3Quantity of substance

If scaffold porosity is increased to improve nutrient transport and cell infiltration, then mass transfer is improved, but mechanical strength is reduced

Engineering Contradiction:

Improvenutrient transport efficiencyVSAvoidscaffold mechanical strength

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The scaffold is segmented into load-bearing structural elements and porous functional regions. The structural framework provides mechanical strength while the porous regions within and between struts provide nutrient transport channels and cell infiltration spaces, allowing both functions to coexist.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the scaffold have different porosity levels optimized for their specific functions: higher porosity in regions requiring nutrient transport and cell infiltration, and lower porosity in regions requiring mechanical strength. This local optimization resolves the contradiction between transport efficiency and structural integrity.

Inventive Principle:

Principle #3Local quality

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 higher yields of anchorage-dependent cells and improved tissue engineering scaffolds with controlled porosity and biomaterial viability, facilitating industrial-scale production of pharmaceuticals and regenerative medicine applications.

Implementation Method 1

depositing the scaffolding material into a coolant having a thermal conductivity of greater than 0.026

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8735117B2Method for making artificial scaffold having porous three-dimensional body comprising cells

Publication Date: 2014.05.27 DREXEL UNIV

AI summary

In on aspect, the invention includes a microcarrier bead having a porous three-dimensional core having (a) a polymeric porous three-dimensional body having porosity of about 15 to about 90% such that at least 99% of pores are interconnected and have diameters of at most 200 microns, (b) an outer protective layer and optionally (c) a filler. In another aspect, the invention includes a method of making an artificial scaffold wherein a scaffolding material is extruded into a coolant and thereby creating a porous material having a porosity of between 15-90% such that at least 99% of pores are interconnected and have diameters of at most 200 microns.