Automated Assay Driver with Magnetic Bead Control
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Solution Overview
Problem
Current assay driver systems lack automation for remote authentication, precise movement of magnetic beads, and efficient interpretation of results, which hinders rapid identification and response during infectious disease outbreaks in remote areas.
Innovation Solution
An automated assay driver system using a controlled movement of permanent or electromagnets to guide magnetic beads through an assay cartridge, with a microcomputer-driven mechanism for precise movement and authentication, enabling efficient interaction with assay reagents and remote result transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual operation of assay driver is used, then device complexity is reduced, but productivity and accuracy deteriorate due to lack of automation
Solution Approach 1:
The assay driver system performs self-authentication via barcode scanning and automatically executes the assay protocol without manual intervention. The system self-regulates magnetic bead movement, mixing, and incubation timing based on the authenticated cartridge instructions, eliminating the need for manual operation while maintaining controlled complexity through automation.
2Productivity
If magnetic beads are moved quickly among wells, then productivity is improved, but manufacturing precision deteriorates due to improper mixing
Solution Approach 1:
The assay driver implements periodic action by alternating between rapid magnetic bead transport between wells and controlled mixing cycles. The system moves beads quickly to the next well, then performs a mixing cycle with oscillation or agitation, repeating this sequence throughout the assay protocol. This periodic alternation maintains high throughput while ensuring proper mixing precision at each stage.
3Manufacturing precision
If reaction time is extended for proper mixing, then manufacturing precision is improved, but productivity deteriorates due to slower assay completion
Solution Approach 1:
The assay driver maintains continuity of useful action by overlapping operations. While magnetic beads are reacting with reagents in one well during the incubation period, the system simultaneously prepares the next well, positions magnetic beads for the subsequent step, and pre-warms reagents. This continuous multi-tasking ensures proper reaction accuracy is achieved without idle time, maintaining high assay throughput.
4Manufacturing precision
If magnetic field strength is increased for better bead control, then manufacturing precision is improved, but use of energy worsens
Solution Approach 1:
The assay driver implements dynamic magnetic field control by adjusting field strength based on the operational phase. During magnetic bead transport between wells, a stronger magnetic field is applied for precise control. During incubation phases, the magnetic field is reduced or deactivated. The system dynamically modulates field strength and duration to match the immediate operational requirements, achieving precise bead control while minimizing overall energy consumption.
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 enhances assay accuracy, efficiency, and rapid result interpretation, facilitating timely medical intervention and outbreak control by automating the assay process and enabling remote authentication and result reporting.
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
The magnets are preferably permanent magnets, such as rare earth magnets
Implementation Method 3
Movement of the magnet holder along the second axis is powered by an electromagnet coil, such as a linear solenoid actuator
Implementation Method 4
rotation of the externally threaded driving rod is driven by the shaft of a stepping motor which can move a specified increment and hold
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 stepping 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 encoded identifier 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.