Digital Microfluidics Chip with Drive Transistor for Rare Cell Analysis
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Solution Overview
Problem
Traditional single cell separation and library preparation technologies are prone to sample loss, damage, and manual operation errors, making them inefficient and difficult to scale for high-throughput sequencing, especially for rare cell analysis.
Innovation Solution
A digital microfluidics chip with a dual-gate drive transistor and integrated temperature and magnetic control systems enables automated screening, enrichment, cracking, pre-amplification, and library preparation of rare cells, using Electrowetting on Dielectric (EWOD) principles and magnetic nanoparticles for precise droplet manipulation and sequencing-ready library generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single cell separation and library preparation technologies are used, then manual operation is simple, but sample loss and damage occur frequently and manual errors increase
Solution Approach 1:
The patent replaces manual mechanical operations with an automated digital microfluidics system that uses electrowetting on dielectric (EWOD) technology. The drive transistor controls the drive electrode to manipulate droplets containing single cells through electrical fields, eliminating manual handling and reducing sample loss and contamination while maintaining operational simplicity through automation.
2Productivity
If traditional manual methods are used for cell separation and library preparation, then device structure is simple, but processing efficiency and throughput are low
Solution Approach 1:
The patent integrates multiple functions (cell separation, droplet manipulation, library preparation) into a single digital microfluidics chip. The drive transistor and drive electrode system combines control and actuation functions, enabling high-throughput processing by performing multiple operations in an integrated platform rather than separate manual steps.
Solution Approach 2:
The patent uses electrical parameters (voltage signals from the drive transistor to the drive electrode) to control droplet manipulation dynamics. By changing electrical parameters, the system can rapidly switch between different operations (separation, transport, mixing) to achieve high throughput without mechanical reconfiguration.
3Measurement precision
If traditional methods are used for rare cell analysis, then operation procedure is simple, but accuracy and precision are reduced
Solution Approach 1:
The patent replaces imprecise manual manipulation with electrically-controlled droplet manipulation. The drive transistor provides precise control of the drive electrode voltage, enabling accurate positioning and manipulation of droplets containing rare cells, thereby improving separation accuracy and reducing manual errors.
4Reliability
If automated digital microfluidics system is implemented, then sample loss and manual errors are reduced, but device structure and control system become complex
Solution Approach 1:
The drive transistor and drive electrode system serves multiple functions: controlling droplet movement, maintaining droplet integrity, and enabling various operations (separation, transport, mixing). This multi-functionality reduces the need for separate components for each operation, thereby reducing overall device complexity while maintaining high reliability through automated control.
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
The solution enables efficient, automated, and high-precision capture, separation, and library preparation of rare cells, reducing manual errors and sample loss, and facilitating high-throughput sequencing with improved accuracy and speed, suitable for applications in cancer diagnosis and research.
Implementation Method 1
the storage capacitor is configured to be charged when the drive transistor is turned on, and to maintain a voltage signal on the drive electrode when the drive transistor is turned off
Implementation Method 2
using Electrowetting on Dielectric (EWOD) principles and magnetic nanoparticles for precise droplet manipulation
Data Source
AI summary
A digital microfluidics chip and a drive method thereof, and a digital microfluidics apparatus are provided. The digital microfluidics chip includes a first substrate (1) and a second substrate (2) which are oppositely disposed, the first substrate (1) is provided with a plurality of drive regions for driving a droplet to move, at least one drive region includes a drive transistor (50), a drive electrode (60), and a storage capacitor, the drive electrode (60) is connected with the drive transistor (50) and the storage capacitor respectively, and the storage capacitor is configured to be charged when the drive transistor (50) is turned on, and to maintain a voltage signal on the drive electrode (60) when the drive transistor (50) is turned off.