Microfluidic Reversed Microwell System for Low-Volume Biological Analysis
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Solution Overview
Problem
Current ex-vivo functional assays for tumor therapy are limited by their inability to provide high-content, time-lapse analysis of small biological samples, require significant sample volumes, and are operator-dependent, making them inefficient and costly, especially when dealing with limited tumor samples.
Innovation Solution
A microfluidic device with an open reversed microwell system that allows for the precise charging and discharging of fluids without pumps or valves, enabling high-content analysis and dynamic monitoring of biological samples, including those with as few as 10-20 cells, using interference coupling between a tip and a vertical channel for fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ex-vivo functional assays are used, then operator expertise and specialized equipment are required, but this increases device complexity and reduces ease of operation
Solution Approach 1:
The patent replaces complex mechanical flow cytometry systems with a microfluidic device that uses integrated channels and chambers to automatically guide cell processing. The microfluidic architecture substitutes bulky mechanical equipment with miniaturized fluid handling structures that perform similar analytical functions through passive fluid dynamics and integrated design.
Solution Approach 2:
The microfluidic device integrates multiple analytical functions into a single platform, combining cell lysis, DNA extraction, amplification, and detection chambers within one device. This multi-functional design eliminates the need for separate specialized equipment and operator interventions for each analytical step.
2Measurement precision
If conventional functional assays are used, then significant sample volumes are required, but this increases loss of substance and reduces adaptability to limited samples
Solution Approach 1:
The patent segments the sample processing into discrete microfluidic chambers, each optimized for specific operations (lysis, extraction, amplification, detection). This segmentation allows efficient processing of minimal sample volumes by confining cells to small, controlled volumes at each processing stage, preventing sample loss and enabling analysis of limited clinical specimens.
Solution Approach 2:
The microfluidic device changes the physical parameters of sample handling by reducing volume from milliliters to microliters, increasing surface-to-volume ratios for more efficient processing, and controlling fluid flow rates to minimize sample loss while maintaining detection sensitivity.
3Measurement precision
If manual operations are used, then operator expertise is required, but this increases loss of time and reduces productivity
Solution Approach 1:
The microfluidic device enables continuous automated processing where cells flow sequentially through lysis, extraction, amplification, and detection chambers without interruption or manual intervention. This continuous operation eliminates downtime between steps, reduces total testing time from days to hours, and maintains analytical accuracy through consistent automated processing.
Solution Approach 2:
The device performs self-service automation where the microfluidic architecture automatically guides reagent mixing, cell processing, and data collection without operator intervention. The integrated design allows the system to self-regulate fluid flow, temperature, and detection parameters, eliminating delays associated with manual operations while preserving measurement precision.
4Productivity
If flow cytometry is used, then high-content analysis is limited, but this reduces measurement precision and time-lapse capability
Solution Approach 1:
The patent transitions from the two-dimensional flow cytometry approach to a three-dimensional microfluidic architecture with vertical channels and stacked chambers. This dimensional change enables simultaneous multi-parameter detection and time-lapse imaging by providing spatial separation of detection functions and allowing optical access from multiple angles, thereby increasing both throughput and measurement precision.
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
Enables rapid, operator-independent high-content analysis and dynamic processing of small biological samples, reducing costs and sample requirements, and providing accurate drug response predictions within 24-48 hours, suitable for clinical applications.
Implementation Method 1
using interference coupling between a tip and a vertical channel for fluid management
Data Source
AI summary
A method for analysis of biological samples, implemented in a reversed open microwell system which includes an array of open microwells, a microchannel, an input port for reagents and/or biological samples and an output port. The ports are in microfluidic communication with the microchannel. The microchannel has a cross-section area of micrometric dimensions and provides fluid to the microwells. The microwell system is inserted in an automated management system that includes: an incubator at controlled temperature, humidity and CO2, fluid dispensing system, phase-contrast and fluorescence image acquisition. A kit introduces fluids in a microfluidic device that includes a tip. A microfluidic device and system include a microchannel and an input region having a vertical channel. The tip and the vertical channel are dimensioned to produce an interference coupling. A discharge region includes: a discharge container connected with the microfluidic device through a discharge channel and an output port.