Automated Assay Driver Using Magnetic Bead Transport
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Solution Overview
Problem
Current assay driver systems lack automation for precise movement of magnetic beads among assay reagents in a cartridge, leading to inaccuracies and inefficiencies in reaction times, and there is a need for remote authentication and result interpretation to manage rapidly spreading infections effectively.
Innovation Solution
An automated assay driver system using a scanning platform with a magnetic array, controlled by a microcomputer, that moves magnetic beads among wells in an assay cartridge based on authenticated instructions, ensuring precise interaction with reagents and efficient result reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic beads are moved manually among assay reagents, then operation flexibility is maintained, but measurement precision and reliability deteriorate due to timing inaccuracies
Solution Approach 1:
The patent replaces manual mechanical manipulation of magnetic beads with an automated magnetic field-based system. A magnetic driver system uses magnetic fields to precisely control the movement of magnetic beads through the assay cartridge, eliminating human timing errors and achieving precise reaction time control without complex mechanical actuators.
Solution Approach 2:
The magnetic beads themselves serve as the actuation mechanism. The beads contain magnetic particles that respond directly to magnetic fields, allowing the system to move and manipulate the beads without external mechanical components. The beads self-navigate through the assay wells when exposed to appropriately positioned magnetic fields.
2Productivity
If magnetic beads are moved quickly among wells, then productivity is improved, but manufacturing precision deteriorates due to clustering
Solution Approach 1:
The magnetic driver system employs periodic oscillation of magnetic fields to move magnetic beads between wells. By oscillating the magnetic field at controlled frequencies and amplitudes, the system achieves rapid bead transport while preventing clustering through continuous motion. The periodic action allows beads to be quickly moved while maintaining dispersion.
Solution Approach 2:
The system uses dynamic magnetic field control to adjust bead movement characteristics in real-time. The magnetic field strength, direction, and oscillation frequency are dynamically adjusted based on the assay protocol requirements, enabling both rapid transport and precise mixing control within the same system.
3Reliability
If magnetic field strength is increased to prevent bead clustering, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts magnetic field parameters (strength, frequency, duration) based on the specific assay requirements and bead position. Rather than maintaining constant high field strength, the system uses optimized parameter sequences that achieve reliable bead dispersion and mixing while minimizing overall energy consumption through efficient field cycling.
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 provides accurate, efficient, and rapid interpretation of assay results, reducing inaccuracies and enabling quick action during infectious disease outbreaks by automating the assay process and facilitating remote authentication and result transmission.
Implementation Method 1
The movement of magnetic beads among wells of the cartridge is driven and guided by controlled movement of magnets or a magnetic array
Implementation Method 2
an electromagnetic inducing coil
Implementation Method 3
Rotation of the externally threaded driving rod is driven by the shaft of a DC motor
Data Source
AI summary
The invention herein relates to conducting assays with an apparatus including a substantially transparent assay cartridge loaded with magnetic beads, and a magnet carrier base positioned below a scanning platform holding the assay cartridge. The assay cartridge includes magnetic beads, sample and control solutions in some wells, and assay reagents in others. A microcomputer controls a DC motor which controls movement of the magnet carrier base, and causes the magnetic beads to travel from one well to another. An electromagnetic coil-spring assembly induces mixing of well contents with the magnetic beads on actuation. The assay cartridge is authenticated by sending its encoding to a server or website, and assay instructions are provided remotely to the microcomputer. Following assay completion, the cartridge can have color change or other assay indication detected, and the results sent to the server or website or another recipient.