Microfluidic Mixing via Actuated Microposts for Sample Homogeneity

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Solution Overview

Problem

Current methods for blood collection and analysis face challenges in both high and low resource environments, where either excessive blood volume is drawn or small volume samples lack homogeneity due to poor mixing, leading to suboptimal diagnostics.

Innovation Solution

A mixing-enhanced microfluidic container system with a reusable actuation chuck that applies actuation forces like magnetic, thermal, or electrical fields to microposts within the container, ensuring thorough mixing of biological fluids with reagents, suitable for both high-throughput processing and point-of-care diagnostics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If small volume blood draw (5-500 μL) is performed in low resource environment, then blood volume required is reduced, but sample homogeneity deteriorates due to poor mixing

Engineering Contradiction:

Improveblood volumeVSAvoidsample homogeneity

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent employs acoustic vibration (a type of mechanical vibration) to agitate and mix the blood sample within the capillary tube. The vibration device generates oscillations that create turbulent flow patterns, effectively mixing the small volume blood sample (5-500 μL) to achieve homogeneity without requiring manual shaking or larger volumes.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent replaces manual shaking or mechanical stirring mechanisms with an acoustic field-based mixing approach. By using acoustic waves to induce fluid motion and mixing, the system eliminates the need for complex mechanical mixing components while achieving effective homogenization of small blood volumes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If manual shaking is used to mix capillary tube sample, then mixing action is applied, but effective mixing is not achieved due to insufficient agitation

Engineering Contradiction:

Improvemixing operationVSAvoidsample homogeneity

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent replaces manual shaking operations with acoustic field-based mixing. The acoustic vibration device generates standing waves or traveling waves within the capillary tube that induce intense local fluid motion, creating effective mixing without requiring manual manipulation. This substitution maintains ease of operation while dramatically improving mixing effectiveness.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The acoustic vibration applied to the capillary tube operates as a periodic action, with oscillations at specific frequencies that create repetitive fluid motion patterns. This periodic agitation ensures thorough mixing by continuously cycling the fluid through regions of high shear and turbulence, achieving homogeneity more effectively than single-direction manual shaking.

Inventive Principle:

Principle #19Periodic action

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

This system effectively mixes and stabilizes small volumes of biological fluids, enhancing diagnostic accuracy and efficiency in both high and low resource settings by ensuring homogeneous samples for analysis.