Rotating Magnet Layout for Faster Magnetic Bead Separation
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Solution Overview
Problem
Existing magnetic separation devices face challenges in achieving both high separation speed and efficiency due to the 'spike phenomenon', where magnetic beads are arranged in a needle shape, reducing separability and leading to impurities mixing with the extracted biological substance.
Innovation Solution
A magnetic separation device with a drive unit that adjusts the posture of magnets relative to the tubular accommodation portions, applying magnetic fields at specific angles to control the spike phenomenon, ensuring efficient separation and discharge of magnetic beads and liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the permanent magnet is disposed with N pole facing the container side to apply a strong magnetic field, then the magnetic separation speed is improved, but the magnetic beads are arranged in a needle shape (spike phenomenon) which reduces separability between magnetic beads and liquid
Solution Approach 1:
The magnetic stand employs a rotatable magnet mechanism that can dynamically change the magnetization direction between two opposite directions. During the magnetic separation process, the magnet is rotated to alternate between attracting magnetic beads to the container wall and releasing them, enabling both high separation speed and effective liquid discharge without spike phenomenon interference
Solution Approach 2:
The system uses periodic reversal of magnetization direction through rotation. The magnet alternates between two opposite magnetization states: one state attracts magnetic beads to the container wall for separation, while the other state releases them for liquid discharge. This periodic action maintains high separation efficiency while preventing permanent needle-shaped arrangement of magnetic beads
2Manufacturing precision
If the permanent magnet arrangement is changed to prevent the spike phenomenon, then the separability between magnetic beads and liquid is improved, but the magnetic field gradient becomes small and the magnetic separation time becomes long
Solution Approach 1:
Instead of using a fixed magnet arrangement, the system uses a rotatable magnet that can dynamically adjust its magnetization direction. This allows the system to alternate between high-gradient configurations (for rapid separation) and low-gradient configurations (for effective liquid discharge), achieving both speed and separability without compromise
Solution Approach 2:
The periodic rotation of the magnet creates alternating high and low magnetic field gradients. During the high-gradient phase, magnetic beads are rapidly separated; during the low-gradient phase, magnetic beads are released for liquid discharge. This periodic variation in field strength achieves both fast separation and good separability
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 device enhances magnetic separation speed and efficiency by preventing the spike phenomenon, improving solid-liquid separability and reducing impurity mixing, thereby enhancing the purity of extracted biological substances.
Implementation Method 1
a magnet (11) provided at a position adjacent to a tubular accommodation portion (92) extending along a first axis (AX1) and having magnetization for applying a magnetic field to the accommodation portion (92)
Implementation Method 2
When a magnetic field is applied to a container containing magnetic beads, the magnetic beads in the container are arranged along a direction of the magnetic field
Data Source
AI summary
A magnetic separation device includes: a magnet provided at a position adjacent to a tubular accommodation portion extending along a first axis and having magnetization for applying magnetic field to the accommodation portion; a base configured to support the magnet; and a drive unit configured to change, when an axis orthogonal to the first axis is a second axis and an axis orthogonal to the second axis in a plane including the second axis is a third axis, a posture of the magnet between a first posture in which a direction of the magnetization faces a direction closer to the second axis than the third axis and a second posture in which the direction of the magnetization faces a direction closer to the third axis than the second axis.