Nanofluidic Flow Cell with Pneumatic Deflection for Single-Molecule Sequencing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current molecular analysis techniques, such as DNA sequencing and diagnostics, face challenges in achieving high-quality, long-read data due to limitations in molecular isolation, handling, and imaging, leading to incomplete genomic understanding and hindered therapeutic development, particularly due to short read lengths and high error rates in existing sequencing technologies.
Innovation Solution
A nanofluidic flow cell system with bonded substrates and carved microchannels and nanostructures for single-molecule confinement and imaging, utilizing pneumatic deflection to entrap molecules in nanoconfinement areas, allowing for high-resolution imaging and manipulation of individual molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current sequencing methods are used, then sequencing can be performed, but read lengths are short and error rates are high
Solution Approach 1:
The device segments the flow cell into distinct functional zones including microchannels for molecule introduction, a central chamber for confinement, and nanostructures for positioning. This segmentation allows optimized handling at each stage, enabling long-read sequencing with high accuracy by maintaining molecular integrity throughout the process
Solution Approach 2:
The invention transitions from 2D surface deposition to 3D nanoscale confinement within the central chamber. The nanostructures create a three-dimensional confinement space that maintains long DNA strands in an extended state, enabling accurate sequencing of long reads while preventing the shortening and fragmentation issues of conventional methods
2Measurement precision
If molecules are confined in nanoscale spaces, then single-molecule imaging is enabled, but device fabrication complexity increases
Solution Approach 1:
The device uses pneumatic actuators to control the flexible substrate, enabling dynamic adjustment of the nanoscale confinement space. This pneumatic control simplifies the fabrication process compared to rigid nanoscale structures, as the flexible substrate can be sealed and controlled using standard microfluidic bonding techniques while still achieving the required single-molecule imaging precision
Solution Approach 2:
The flow cell employs a flexible substrate that can be bonded to form sealed nanofluidic channels. This flexible membrane approach simplifies fabrication compared to etching rigid nanoscale features, while the flexibility enables pneumatic actuation for controlling molecule confinement and release, achieving both imaging quality and manufacturing simplicity
3Loss of information
If long DNA strands are analyzed, then genomic information is preserved, but molecular handling and isolation become difficult
Solution Approach 1:
The device is pre-configured with nanoscale confinement structures in the central chamber that are designed to capture and hold long DNA strands upon introduction. The microchannels are positioned to guide molecules directly into the confinement zone, and the flexible substrate can be pre-pressurized to create the necessary confinement force, making long DNA handling straightforward despite their size
Solution Approach 2:
The device changes physical parameters including pressure, volume, and confinement dimensions to optimize long DNA handling. By adjusting the pneumatic pressure on the flexible substrate, the confinement strength can be modulated to accommodate different DNA lengths, and the nanoscale dimensions of the central chamber provide optimal conditions for maintaining genomic information integrity while facilitating operation
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 system enables high-throughput, single-molecule analysis with improved data quality, reduced device size, and simplified actuation, enhancing genomic understanding and therapeutic development by providing long-read data with reduced error rates and increased reproducibility.
Implementation Method 1
a pneumatic system configured for exerting alternatively an air pressure and/or an air suction on an external surface said top substrate
Implementation Method 2
utilizing pneumatic deflection to entrap molecules in nanoconfinement areas
Implementation Method 3
nanofluidic flow cell system with bonded substrates and carved microchannels and nanostructures for single-molecule confinement and imaging
Data Source
AI summary
Nanofluidic flow cells and systems for single-molecule nanoconfinement and imaging of molecules in a fluid are described. The nanofluidic flow cell comprises a bottom substrate bonded to a top substrate, microchannels and a central chamber carved in the bottom or top substrate. The microchannels and the central chamber define an empty space into which a fluid can flow. The microchannels extend on opposite side of the central chamber, each microchannel comprising a central portion crossing the central chamber and a pair of arms extending outside the central chamber, these arms comprising a fluid port positioned at opposite ends of the microchannel and outside the central chamber. The central chamber comprises a nanoconfinement and imaging area including carved nanostructures configured for single-molecule nanoconfinement. Also described are nanofluidic chips, methods of confinement, pneumatic-based nanofluidic systems and manifold assembly for the nanofluidic flow cell.