Electrokinetic Loading of Sub-micron Reaction Chambers
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Solution Overview
Problem
Current massively-parallel analysis instruments for biological or chemical samples are limited by their large size, lack of portability, requirement for skilled operation, and need for controlled environments, leading to delayed sample analysis results, especially when samples need to be sent from point-of-care to laboratories.
Innovation Solution
The development of integrated devices with electrokinetic sample loading techniques, which include electrically conductive layers within the device to generate targeted electric fields for efficient loading of molecules into reaction chambers, reducing reliance on external electrodes and improving loading efficiency, especially for low-concentration nucleic acid samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional massively-parallel analysis instruments are used, then analysis capability is achieved, but device size and lack of portability occur
Solution Approach 1:
The instrument is divided into modular components including a portable analysis device and a separate reader system. The analysis device contains multiple reaction chambers arranged in a compact array, allowing parallel processing of multiple samples while maintaining a portable form factor. This segmentation enables the core analysis functionality to be distributed across manageable modules rather than requiring a single large monolithic system.
Solution Approach 2:
The patent transitions from planar, two-dimensional sample loading to three-dimensional electrokinetic injection through vertically oriented electrodes. This vertical dimensionality enables efficient sample introduction into sub-micron reaction chambers without increasing the horizontal footprint of the device, thereby maintaining compact size while preserving high-throughput analysis capability.
2Productivity
If traditional instruments are used, then analysis is performed, but skilled technician operation is required
Solution Approach 1:
The instrument incorporates automated electrokinetic sample loading that performs sample introduction and chamber filling without manual intervention. The system automatically controls sample flow, chamber sealing, and reaction initiation through integrated electronics and software, eliminating the need for skilled technicians to manually handle samples or adjust instrument parameters while maintaining consistent analysis quality.
Solution Approach 2:
Manual mechanical sample loading operations are replaced with automated electrokinetic injection systems that use electric fields to drive sample molecules into reaction chambers. This substitution of mechanical manipulation with field-based automation reduces operational complexity and eliminates the need for skilled technical expertise in sample handling and instrument operation.
3Productivity
If samples are sent to laboratory for analysis, then analysis can be performed, but analysis time is delayed
Solution Approach 1:
The instrument enables preliminary sample analysis to be performed at the point of care before samples need to be sent to the laboratory. By conducting initial analysis locally using the portable device with multiple reaction chambers, the system eliminates the waiting period associated with sample transport and laboratory processing, thereby reducing overall analysis time while maintaining the capability for comprehensive sample evaluation.
4Productivity
If electrokinetic loading with external electrodes is used, then sample loading is achieved, but device complexity increases
Solution Approach 1:
The patent integrates electrodes directly into the reaction chamber structure, merging the electrokinetic loading function with the reaction chamber itself. This integration eliminates the need for separate external electrode assemblies and complex wiring systems, reducing overall device complexity while maintaining efficient sample loading capability through the combined structure.
Solution Approach 2:
The reaction chamber structure serves multiple functions: it contains the reaction volume, provides electrokinetic injection through integrated electrodes, and facilitates optical detection. This multi-functionality eliminates the need for separate dedicated electrode components, thereby simplifying the overall device architecture while preserving effective sample loading performance.
5Quantity of substance
If conventional sample loading is used, then samples are loaded into chambers, but loading efficiency is insufficient for low-concentration samples
Solution Approach 1:
Conventional mechanical or diffusion-based sample loading is replaced with electrokinetic injection that uses electric fields to actively drive sample molecules into reaction chambers. This field-based mechanism provides controlled, efficient sample introduction that works effectively at low concentrations by applying electrical forces directly to charged molecules, thereby improving loading efficiency without requiring high sample concentrations.
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 enables compact, portable, and user-friendly analysis systems that can efficiently load molecules into reaction chambers, significantly reducing analysis time and improving the ability to handle large molecules and low-concentration samples, facilitating point-of-care genetic sequencing and personalized medicine applications.
Implementation Method 1
integrated devices with electrokinetic sample loading techniques, which include electrically conductive layers within the device to generate targeted electric fields for efficient loading of molecules into reaction chambers
Data Source
AI summary
Apparatus and techniques for electrokinetic loading of samples of interest into sub-micron-scale reaction chambers are described. Embodiments include an integrated device and related apparatus for analyzing samples in parallel. The integrated device may include at least one reaction chamber formed through a surface of the integrated device and configured to receive a sample of interest, such as a molecule of nucleic acid. The integrated device may further include electrodes patterned adjacent to the reaction chamber that produce one or more electric fields that assist loading the sample into the reaction chamber. The apparatus may further include a sample reservoir having a fluid seal with the surface of the integrated device and configured to hold a suspension containing the samples.