Magnetic Bead Manipulation in Liquid Handling Consumables
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Solution Overview
Problem
Existing magnetic separation technologies face challenges in efficiently separating magnetic beads from liquid solutions in irregularly shaped consumables, particularly due to difficulties in applying a uniform magnetic field and managing residual magnetic fields during the binding process.
Innovation Solution
A magnetic separator system with a base unit and a magnet system that includes a first separation magnet and a movement system allowing the magnet to move in at least two directions to adapt to the shape of the consumable, along with a stationary magnet to deflect and remove residual magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stationary magnet is used for magnetic separation, then the device structure is simple, but it cannot adapt to irregularly shaped consumables and maintain uniform magnetic field application
Solution Approach 1:
The magnet system is designed to move dynamically within the consumable rather than remaining stationary. The magnet can translate and rotate to adapt to irregular geometries, maintaining optimal positioning for magnetic field application throughout the separation process
Solution Approach 2:
The movable magnet system serves multiple functions: it adapts to various consumable shapes, maintains uniform magnetic field distribution, and can access irregular regions that stationary magnets cannot reach, making the system universally applicable to different geometries
2Productivity
If the magnet is positioned close to the consumable wall for efficient separation, then separation efficiency improves, but residual magnetic field interference increases during binding
Solution Approach 1:
The magnet system dynamically adjusts its positioning based on the operational phase. During binding, the magnet retracts to minimize residual field interference; during separation, it advances close to the consumable wall to maximize separation efficiency through strong magnetic field application
Solution Approach 2:
The magnet system employs periodic movement between binding and separation phases. It alternates between retracted and advanced positions, creating a rhythmic pattern of magnetic field application that optimizes both binding efficiency and separation performance
3Reliability
If liquid mixing is performed to increase binding efficiency, then binding efficiency improves, but the mechanical stress on magnetic beads increases
Solution Approach 1:
The system replaces mechanical mixing with magnetic field-driven bead movement. The oscillating magnetic field causes beads to move and collide with the consumable wall, achieving effective binding without the high mechanical stress of vortex mixing while maintaining binding efficiency
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 effectively separates magnetic beads from liquid solutions in consumables of varying shapes by ensuring a consistent magnetic field application and minimizing residual magnetic field interference, thereby enhancing the efficiency and accuracy of the separation process.
Implementation Method 1
the magnetic force depends on the gradient of the magnetic field B and on the magnetic moment of the beads m. Since the gradient is the change of the quantity m B per unit distance, the magnetic field strongly depends on the distance between a magnet applying the magnetic field, and the beads.
Implementation Method 2
When the magnetic field is applied, the magnetic beads become magnetized and start forming clusters, which move along the magnetic field gradient direction.
Implementation Method 3
a stationary magnet to deflect and remove residual magnetic fields
Data Source
AI summary
A magnetic separator for a liquid handling system includes a base unit having at least one receiver configured to receive a consumable, the at least one receiver being dimensioned to receive the consumable in a predefined location at least partially within the base unit. The magnetic separator further includes a magnet system located within the base unit proximate to the at least one receiver, the magnet system including a first separation magnet configured to perform separation of beads located within the consumable when the first magnet is located proximate to the consumable, and a movement system configured to move the first magnet in at least two directions in order to adapt to a shape of the consumable.