Flow Cell Immobilization Using Density and Magnetic Positioning
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Solution Overview
Problem
Existing flow cell technologies face challenges in achieving balanced immobilization of target materials across opposed sequencing surfaces, leading to uneven distribution and migration of sequencing-ready nucleic acid fragments and other target materials, which affects sequencing efficiency and readability of spatial clouds.
Innovation Solution
The method involves using fluids with different densities or a combination of magnetic forces and magnetically responsive target materials to immobilize target materials on both sequencing surfaces, ensuring even distribution by applying conditions that cause materials to migrate to respective surfaces based on their properties such as density, charge, or magnetism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional flow cell technologies are used, then sequencing reactions can be performed, but the target materials become unevenly distributed and migrate during the process
Solution Approach 1:
The patent applies magnetic forces as a counteracting mechanism to balance the gravitational settling of magnetic bead-target material complexes. By introducing a magnetic field through a magnet positioned near the flow cell, the magnetic attraction force counterweights the gravitational force, preventing migration and achieving uniform distribution of target materials across the flow cell surface.
Solution Approach 2:
The patent changes the physical state and distribution characteristics of target materials by adjusting magnetic field parameters. By varying the strength and configuration of the magnetic field, the patent controls the positioning and distribution of magnetic bead complexes, transforming them from a gravitationally-driven settled state to a magnetically-controlled uniform distribution state.
2Quantity of substance
If target materials are introduced into the flow cell, then sequencing-ready nucleic acid fragments become available, but they migrate and fail to maintain even distribution
Solution Approach 1:
The magnetic force generated by the external magnet counterweights the gravitational force acting on the magnetic bead-target material complexes. This balance prevents the complexes from settling and migrating, maintaining their uniform spatial distribution throughout the flow cell while preserving the quantity of available target materials for sequencing.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary force field between the external magnet and the magnetic bead-target material complexes. This intermediary magnetic field mediates the interaction, providing controlled attraction that maintains uniform distribution without requiring direct physical contact or mechanical manipulation of the target materials.
3Reliability
If conventional immobilization methods are used, then target materials can be attached to surfaces, but sequencing efficiency and readability are reduced due to uneven distribution
Solution Approach 1:
By balancing gravitational and magnetic forces, the patent achieves reliable immobilization of target materials in a uniform distribution pattern. This prevents the clustering and migration that occur with conventional methods, thereby improving sequencing efficiency and the readability of spatial clouds without compromising immobilization effectiveness.
Solution Approach 2:
The patent creates a magnetically-controlled equipotential environment within the flow cell where magnetic bead-target material complexes experience balanced forces. This equipotential state ensures uniform distribution and stable immobilization across the entire flow cell surface, maximizing the effective area for sequencing reactions and improving overall productivity.
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 results in a more uniform distribution of target materials across sequencing surfaces, improving sequencing metrics and readability of spatial clouds, thereby enhancing the overall utilization and efficiency of the flow cell.
Implementation Method 1
applying a magnetic force to another of the two opposed sequencing surfaces, thereby pulling some other of the target material to the other of the two opposed sequencing surfaces
Implementation Method 2
one of: the first fluid has a density less than a density of the target material and the second fluid has a density greater than the density of the target material
Data Source
AI summary
In an example, a target material is immobilized on two opposed sequencing surfaces of a flow cell using first and second fluids. The first fluid has a density less than a target material density and the second fluid has a density greater than the target material density; or the second fluid has a density less than the target material density and the first fluid has a density greater than the target material density. The first fluid (including the target material) is introduced into the flow cell, whereby at least some of the target material becomes immobilized by capture sites on one of the sequencing surfaces. The first fluid and non-immobilized target material are removed. The second fluid (including target material) is introduced into the flow cell, whereby at least some of the target material becomes immobilized by capture sites on another of the sequencing surfaces.