Microchip Electrophoresis Interface for Long-Channel Separation
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Solution Overview
Problem
Existing microchip electrophoresis interfaces are insufficient for applications requiring long separation channels, higher resolution, and higher throughput of sample analysis.
Innovation Solution
A microfluidic chip with conductive eyelets and an electrical interface that includes a shared and independent power amplifier system, allowing for high-voltage signals and electrokinetic separation, along with a selector to manage power distribution to multiple electrodes, arranged in formats compatible with standard liquid handling apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional microchip electrophoresis interfaces are used, then the device structure is simple, but the separation channel length is limited and resolution is insufficient
Solution Approach 1:
The interface is segmented into multiple independent power amplifiers, each capable of driving separate electrode groups. This allows the system to support longer separation channels by providing sufficient voltage output without requiring a single complex high-voltage amplifier, thus resolving the contradiction between channel length and device complexity.
Solution Approach 2:
The patent introduces a multi-dimensional power distribution architecture with shared and independent power amplifiers operating at different control levels. This dimensional expansion of the power supply system enables support for extended separation channels while maintaining manageable interface complexity through modular design.
2Power
If conventional power amplifiers are used, then the device is simple, but it cannot provide high-voltage signals required for long separation channels and high resolution
Solution Approach 1:
The patent merges shared power amplifiers (providing common voltage rails) with independent power amplifiers (providing differential voltage control) into a unified power supply system. This combination achieves the high-voltage signal capability needed for long separation channels and high-resolution separation while distributing complexity across multiple coordinated components rather than requiring a single overly complex amplifier.
Solution Approach 2:
The power amplifier system is designed with multi-functionality, where shared power amplifiers provide baseline voltage output and independent power amplifiers provide additional differential control. This universal design allows the same system to support various separation channel lengths and resolution requirements without requiring separate dedicated hardware for each function.
3Measurement precision
If multiple independent power amplifiers are used for each electrode, then high resolution and long channels are enabled, but the device complexity and cost increase significantly
Solution Approach 1:
The electrode control is segmented into groups, where each group can be independently controlled by dedicated independent power amplifiers. This segmentation enables high-resolution separation by allowing precise voltage control across different channel regions while reducing overall complexity compared to providing completely independent control for every single electrode.
Solution Approach 2:
The system dynamically allocates power amplifier resources based on operational requirements. The shared power amplifiers provide continuous baseline power, while independent power amplifiers are activated as needed for differential voltage control during separation processes. This dynamic operation achieves high measurement precision without maintaining constant high complexity across all operating conditions.
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 longer separation channels, higher resolution, and increased throughput in microchip electrophoresis, facilitating efficient sample analysis.
Implementation Method 1
a voltage difference is placed across opposite channel ends until a desired migration end point is reached
Implementation Method 2
electrophoresis takes advantage of the differential rate of migration of charged species (e.g., particles, molecules) through a separation medium under the influence of an electric field
Implementation Method 3
allowing for high-voltage signals and electrokinetic separation
Data Source
AI summary
A microfluidic system may include a microfluidic chip having a non-conductive substrate and wells connected in common to a microfluidic channel within the non-conductive substrate. Each well may have a galvanic contact with a first portion at an upper surface of the sample well and a second portion that extends into the non-conductive substrate. A plurality of electrodes may be provided as part of an electrical interface, with each electrode configured to contact a respective galvanic contact of the microfluidic chip. The electrical interface may also include at least one shared power amplifier that is configured to generate a power signal (e.g., constant current, constant voltage, pulsed power signal). A selector may be configured to receive the generated power signal from the shared power amplifier and configured to select at least one of the plurality of electrodes and output the received power signal thereto.