Microfluidic Gas Pressure Oscillation Mixing

Solution Overview

Problem

Existing microfluidic devices face challenges in efficiently manipulating and mixing liquids within capillary channels, particularly in ensuring that samples come into contact and react with reagents effectively.

Innovation Solution

The method involves oscillating the gas pressure at the liquid-gas interface within a capillary channel, inducing mixing of materials by creating peak-to-peak pressure variations that can range from 5% to 300% of the average pressure, and oscillating the wall of the capillary channel to modify the gas volume and pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If gas pressure oscillation is applied to induce mixing in capillary channels, then mixing efficiency is improved, but device complexity increases

Engineering Contradiction:

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies pneumatic pressure oscillation to the gas phase in contact with the liquid sample within the capillary channel. By oscillating the gas pressure at controlled frequencies and amplitudes, the system induces mixing in the liquid without requiring mechanical stirrers or complex flow control mechanisms, thus improving mixing efficiency while maintaining relatively simple device architecture.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The system employs periodic oscillation of gas pressure at specific frequencies to achieve effective mixing. The periodic pressure variations create oscillatory flow patterns that enhance mass transfer and mixing efficiency. By tuning the oscillation frequency and amplitude, the system optimizes mixing performance while using a straightforward control approach.

Inventive Principle:

Principle #19Periodic action

2Productivity

If pressure oscillation amplitude is increased to enhance mixing, then mixing effectiveness is improved, but risk of sample loss or contamination increases

Engineering Contradiction:

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system dynamically adjusts the pressure oscillation parameters (frequency and amplitude) based on the specific mixing requirements and sample characteristics. By optimizing the oscillation amplitude to be sufficient for effective mixing but not excessive, the system achieves good mixing effectiveness while maintaining sample integrity and preventing sample loss or contamination through the liquid-gas interface.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent explores the relationship between pressure oscillation parameters (frequency, amplitude) and mixing effectiveness. By carefully selecting and optimizing these parameters, the system achieves effective mixing at amplitudes that do not cause sample loss or contamination. The parameter optimization ensures that the oscillation is strong enough to induce thorough mixing but weak enough to maintain sample containment.

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

This approach effectively induces mixing and manipulation of liquids within the capillary channels, enhancing the contact and reaction between samples and reagents, thereby improving the efficiency of microfluidic processes.

Implementation Method 1

oscillating a gas pressure of the gas of the liquid-gas interface. The oscillations may induce mixing of materials within the liquid

Methodology Applied

Scientific EffectPressure oscillation:

Implementation Method 2

a liquid-gas interface of the liquid may be a distal liquid-gas interface of the liquid disposed between the proximal origin and the distal terminus

Methodology Applied

Scientific EffectGas-liquid interface interaction:

Implementation Method 3

oscillating the wall of the capillary channel to modify the gas volume and pressure

Methodology Applied

Scientific EffectWall oscillation:

Implementation Method 4

oscillating a volume occupied by the gas within the capillary channel

Methodology Applied

Scientific EffectVolume modification:

Data Source

PatentUS20250025876A1Fluid control in microfluidic devices

Publication Date: 2025.01.23

AI summary

A diagnostic system for determining the presence of a target in a sample liquid that includes a diagnostic reader and a microfluidic strip having a microfluidic channel network therein. An actuator within the reader modifies the pressure of a gas in gaseous communication with a liquid-gas interface of a sample liquid within the microfluidic channel network to move and/or mix the sample liquid. The pressure modifications may be continuous and/or oscillatory.