Surface-Attached Structures for Flow Cell Mixing
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Solution Overview
Problem
Conventional techniques for isolating or extracting components from fluids, such as immunoassays and chromatography, often face issues with clogging and long reaction times due to the reliance on steric filters and magnetic beads, which limit surface area-to-volume ratios and require pre-separation methods, increasing complexity and cost.
Innovation Solution
A flow cell system with surface-attached structures, including flexible bodies with metallic components, that are actuated by magnetic or electric fields to move within the cell, enhancing surface area interaction and preventing clogging, while allowing for efficient fluid flow and analyte capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steric filters and columns of packed beads are used for isolation or extraction, then separation capability is improved, but clogging occurs and device complexity increases
Solution Approach 1:
The patent employs dynamic magnetic fields to move magnetic beads continuously through the fluid stream, transforming the static packed column into a dynamic system where beads are constantly repositioned, preventing clogging while maintaining separation capability
Solution Approach 2:
The patent replaces the mechanical packed column structure with magnetic field-controlled mobile beads, substituting a complex mechanical filtration system with a simpler magnetic actuation system that achieves the same separation function without clogging
2Productivity
If a large number of magnetic beads are utilized to achieve superior surface area-to-volume ratio, then analyte capture efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses dynamic magnetic actuation to maximize the utilization of each bead's surface area through continuous movement and repositioning, achieving high analyte capture efficiency with fewer beads compared to static systems where surface area is fixed
Solution Approach 2:
The patent changes the operational parameters of magnetic beads from static to dynamically controllable positions, allowing optimization of bead distribution and fluid flow patterns to enhance analyte capture without increasing bead quantity
3Reliability
If pre-separation techniques such as pre-filters and guard columns are utilized to reduce clogging, then clogging is minimized, but system complexity and cost increase
Solution Approach 1:
The patent extracts and removes the need for separate pre-filters and guard columns by integrating clogging prevention directly into the main separation mechanism through dynamic magnetic bead actuation, simplifying the overall system architecture
Solution Approach 2:
The patent makes the magnetic beads serve multiple functions: they act as both the separation medium and the anti-clogging mechanism through their dynamic movement, eliminating the need for separate pre-filtration components
4Reliability
If fluid sample is allowed to flow throughout the chamber by diffusion for analyte reaction with capture sites, then analyte utilization is improved, but reaction time becomes very long
Solution Approach 1:
The patent introduces dynamic movement of magnetic beads that actively mix and circulate the fluid sample, replacing passive diffusion with active convective transport, thereby achieving complete analyte utilization in much shorter timeframes
Solution Approach 2:
The patent employs oscillating or vibrating magnetic fields to create dynamic motion and mixing of the fluid sample around capture sites, enhancing mass transfer rates and reducing reaction time while maintaining complete analyte utilization
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 system minimizes clogging, reduces reaction times, and improves analyte utilization by actively managing surface-attached structures to enhance fluid flow and mixing, thereby increasing the efficiency of analyte capture and processing in microarray applications.
Implementation Method 1
each surface-attached structure comprising a flexible body and a metallic component disposed on or in the body, wherein application of a magnetic or electric field actuates the surface-attached structure into movement relative to the corresponding attachment site
Implementation Method 2
enhancing flow, circulation, and/or mixing action for analyte capture on a microarray
Data Source
AI summary
A flow cell is provided that includes surface-attached structures in a chamber. The structures are movable in response to a magnetic or electric field. A target extraction or isolation system includes the flow cell and a driver configured for applying a magnetic or electric field to the interior of the flow cell to actuate movement of the structures. The flow cell may be utilized to extract or isolate a target from a sample flowing through the flow cell. Further, a microfluidic system is provided that includes surface-attached structures and a microarray, wherein actuated motion of the surface-attached structures is used to enhance flow, circulation, and/or mixing action for analyte capture on the microarray.