Microfluidic Device Porous Matrix Mixing
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Solution Overview
Problem
Current point-of-care diagnosis methods for infectious diseases are hindered by cumbersome sample preparation and expensive instrumentation, making them unsuitable for rapid, inexpensive diagnosis at the point of care, especially in global health initiatives.
Innovation Solution
A microfluidic device with a sample application site, a flow channel, and a porous component containing a porous matrix and assay reagent, which allows for non-filtering mixing of the reagent with the sample, using capillary action to facilitate the binding of analyte-specific binding members, such as antibodies, to detectable labels, enabling efficient analysis of biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow cytometry-based micro-particle immunoassays are used, then measurement precision and multiplexing capability are improved, but device complexity and cost increase making them unsuitable for point-of-care settings
Solution Approach 1:
The patent extracts the essential immunoassay function from complex flow cytometry instrumentation by using a simplified microfluidic device with a porous support structure that enables direct visual detection of agglutinated particles, eliminating the need for expensive flow cytometers while maintaining diagnostic accuracy
Solution Approach 2:
The patent creates a simplified copy of flow cytometry functionality using micro-particles with embedded reagents that can be visually assessed, replicating the core detection capability without requiring complex optical systems and instrumentation
2Measurement precision
If traditional diagnostic testing is used, then sample analysis accuracy is maintained, but loss of time increases due to requiring separate locations for sample collection and analysis
Solution Approach 1:
The patent merges sample collection, reagent mixing, and analysis functions into a single portable microfluidic device that can be used at the point of care, eliminating the need to transport samples to separate laboratory locations while maintaining diagnostic accuracy
Solution Approach 2:
The microfluidic device performs multiple functions including sample reception, reagent delivery, mixing, and visual detection within a single integrated platform, enabling comprehensive diagnostic capability at various locations without requiring specialized laboratory infrastructure
3Productivity
If porous matrix with large pore volume is used, then mixing efficiency of reagent with sample is improved, but device volume increases
Solution Approach 1:
The patent utilizes a porous support structure with optimized pore characteristics that provides sufficient surface area for reagent embedding and sample mixing while maintaining a compact overall device volume suitable for point-of-care applications
Solution Approach 2:
The patent concentrates the functional reagent-containing porous matrix in a localized region within the microfluidic device, providing efficient mixing where needed while minimizing overall device volume through strategic placement rather than uniform distribution
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 solution enables rapid, cost-effective, and accurate detection of infectious disease markers in biological fluids, improving global health initiatives by providing a portable and flexible measurement system for cellular markers.
Implementation Method 1
The porous matrix is configured to provide for mixing of the assay reagent with the sample flowing through the porous matrix
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
The present disclosure provides methods and systems for assaying a sample. A microfluidic device to perform an assay of a sample (e.g., biological sample) is described having a sample application site, a porous component and a flow channel. The porous component provides for uniform dissolution of a reagent and mixing of the sample and reagent without filtering the sample.