Valved Microfluidic Structure for Automated Differential Extraction

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Solution Overview

Problem

Conventional methods for processing Sexual Assault Evidence Collection Kits (SAECKs) are laborious, time-consuming, and often fail to generate adequate sperm cell DNA recovery, leading to backlogs and slow analysis turnaround times, while mechanized robotic platforms offer limited improvements and require significant financial investment.

Innovation Solution

A valved microfluidic device for automated SAECK processing, utilizing a stack of discs with laser-actuatable valves and centrifugal force for fluid flow control, mimicking conventional differential extraction workflows to achieve efficient fractionation of non-sperm and sperm fractions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional multistep manual processing is used, then procedural simplicity is maintained, but processing time exceeds four hours and sperm cell DNA recovery is inadequate

Engineering Contradiction:

Improveprocessing speedVSAvoidprocess complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces manual mechanical operations with an automated microfluidic system that uses integrated valves, pumps, and centrifugal force to perform sample processing. The microfluidic device automates reagent delivery, mixing, incubation, and fraction collection, eliminating the need for manual tube transfers and manual operation steps while significantly reducing processing time from over four hours to under an hour.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent combines multiple separate processing steps and functions into a single integrated microfluidic device. The device integrates sample loading, reagent delivery, enzymatic lysis, centrifugal separation, and fraction collection into one unified system, eliminating the need for multiple separate tubes and manual transfers between them.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of operation

If mechanized robotic platforms are used, then hands-on time is reduced, but financial investment is considerable and sperm cell DNA recovery is not enhanced

Engineering Contradiction:

Improvehands-on timeVSAvoidsystem cost

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent employs a disposable microfluidic device that is inexpensive to manufacture and use. The device is designed as a single-use component that is discarded after one processing run, eliminating the need for expensive robotic platforms and complex cleaning/validation procedures. This approach significantly reduces financial investment while maintaining automated processing capabilities.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The microfluidic device is designed to be self-contained and self-operating, with integrated valves, pumps, and reaction chambers that automatically perform all processing steps without requiring external robotic manipulation or complex control systems. The device handles its own fluid delivery, mixing, and separation functions internally.

Inventive Principle:

Principle #25Self-service

3Device complexity

If manual tube transfers are performed, then equipment cost is low, but contamination risks increase and processing time is extended

Engineering Contradiction:

Improveequipment costVSAvoidcontamination risk

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The microfluidic device acts as an intermediary system that eliminates direct manual contact between the operator and the sample/reagents. All fluid handling, mixing, and transfer operations are performed automatically within the sealed microfluidic channels, preventing contamination while using simple, low-cost equipment.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Reduces processing time, minimizes sample handling and contamination risks, and enhances sperm cell DNA recovery without the need for costly robotic platforms, thereby improving forensic analysis efficiency.

Implementation Method 1

the valving layer includes vaporizable and meltable portions to respectively open and close valves

Methodology Applied

Scientific EffectVaporization: Evaporation

Implementation Method 2

the valving layer includes vaporizable and meltable portions to respectively open and close valves

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 3

Fluid flow may be provided by selectively spinning the layers of the device after valves are actuated

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS20250249455A1A microfluidic strucure for differential extraction

Publication Date: 2025.08.07 UNIV OF VIRGINIA PATENT FOUND

AI summary

A differential extraction device includes a first fluidic layer, a second fluidic layer, and a valving layer disposed between the first and second fluidic layers and include multiple chambers and microfluidic channels. The valving layer provides the ability to selectively allow and prevent flow between various chambers. Reagent chambers deliver reagent to a sample chamber and multiple recovery chambers receive material from the sample chamber. The valving layer provides the ability to selectively allow and prevent flow between various chambers.