Microfluidic Sequencing Device Cavity-Pore Channel Design
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Solution Overview
Problem
Current DNA sequencing methods require comprehensive sample preparation, including lysis and purification, which are time-consuming and prone to errors and contamination, and often result in sequencing bias due to clonal amplification and separate purification steps.
Innovation Solution
A microfluidic sequencing device with a single-molecule sequencer that omits clonal amplification and separate purification, allowing direct DNA sequencing in a nanopore environment, where cells are individually disrupted and sequenced within a microfluidic matrix, eliminating the need for separate sample preparation and reducing contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comprehensive sample preparation including lysis and purification is performed separately, then DNA purity is improved, but time consumption and error rates increase
Solution Approach 1:
The patent merges lysis and purification steps into a single integrated microfluidic channel system. The channel transitions from a cavity region for cell lysis to a pore region for purification and sequencing, allowing multiple operations to occur sequentially in one continuous flow path without manual intervention or separate equipment.
Solution Approach 2:
The microfluidic channel serves multiple functions: it acts as a reaction chamber for lysis, a filtration system for purification, and a sequencing platform. This multi-functional design eliminates the need for separate dedicated devices for each step, reducing overall process time and complexity.
2Measurement precision
If clonal amplification is performed, then signal strength is improved, but sequencing bias is introduced
Solution Approach 1:
The patent extracts and removes the clonal amplification step from the sequencing workflow. By directly sequencing single DNA molecules without amplification, the method eliminates the source of sequencing bias while maintaining sufficient signal strength through sensitive detection in the nanopore environment.
3Reliability
If separate purification steps are performed, then DNA purity is improved, but contamination risk increases
Solution Approach 1:
The purification step is merged into the continuous microfluidic flow path, occurring in-line between lysis and sequencing. This eliminates the need to open samples to external environments or transfer between separate purification devices, thereby minimizing contamination opportunities while maintaining purification effectiveness.
4Reliability
If comprehensive sample preparation is performed, then sequencing quality is improved, but device complexity increases
Solution Approach 1:
Multiple preparation steps are merged into a single microfluidic chip with integrated channels. The cavity-pore structure provides both lysis and purification functions within one device, eliminating the need for multiple separate instruments and reducing overall system complexity.
Solution Approach 2:
The microfluidic channel performs multiple functions sequentially: cell lysis in the cavity region, DNA purification during flow through the transition zone, and sequencing in the pore region. This multi-functionality consolidates what would traditionally require separate devices into one integrated platform.
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 high-sensitivity, low-error, and rapid single-cell sequencing with reduced time and error rates, allowing for the analysis of small cell amounts and genetic heterogeneity without the need for separate purification, while preventing DNA contamination.
Implementation Method 1
The sequencing channel is formed as a cavity in the region of the first gap and is formed as a pore in the region of the second gap
Data Source
AI summary
A sequencing device has at least one sequencing channel configured to fluidically connect a first gap with a second gap. The sequencing channel is formed as a cavity in the region of the first gap and is formed as a pore in the region of the second gap. The pore has a smaller cross section than the cavity.