Microfluidic Cell Separation via Antibody-Coated Pillars

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Solution Overview

Problem

Current methods for separating cells from biological fluids are inefficient and lack the capability for rapid isolation of purified cell types necessary for clinical diagnostics and research, requiring improved technologies for effective cell sorting and purification.

Innovation Solution

A microfluidic device with a membrane separating two chambers, allowing specific cells to pass through based on morphological or bioaffinity differences, utilizing polymers like PMMA, polycarbonate, and fluoropolymers, and biofunctionalization with antibodies to sort cells such as tumor and white blood cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional cell separation methods are used, then cell separation can be achieved, but the separation efficiency and purity are insufficient

Engineering Contradiction:

Improvecell separation purityVSAvoidseparation efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The device segments the flow of cells into parallel streams using alternating capture and non-capture zones created by patterned antibody-coated pillars. This segmentation allows simultaneous separation of different cell types in parallel, achieving both high purity and high throughput without requiring sequential processing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Antibody-coated pillars act as intermediary elements that selectively bind to specific cell surface markers. These pillars mediate the separation process by capturing target cells while allowing non-target cells to pass through, enabling highly selective separation without direct cell-cell interaction

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If rapid cell isolation is implemented, then productivity increases, but separation precision may be compromised

Engineering Contradiction:

Improveisolation speedVSAvoidpurification accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The device maintains continuous cell flow through the microchannel while separation occurs, eliminating the need for batch processing or repeated loading/unloading steps. Cells are continuously captured and released in alternating zones, enabling rapid isolation without sacrificing precision

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The invention transitions from traditional planar separation to three-dimensional separation using vertically arranged pillars that create capture zones at specific heights. This dimensional approach allows cells to be separated based on their position in the flow stream, enabling rapid sorting with high precision

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 device achieves high purity levels of up to 97% by exploiting cell size differences and bioaffinity, enabling efficient separation of cell categories from blood samples, suitable for both manual and automated protocols.

Implementation Method 1

the membrane has a filter that allow cells to pass from the first chamber to the second chamber

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

The filter can include a plurality of rectangular openings. The filter can include a plurality of circular openings. The filter can include a plurality of cross-shaped openings.

Methodology Applied

Scientific EffectSize-based separation: Porosity