Magnetic Bead Extraction System for Point-of-Care DNA Analysis
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Solution Overview
Problem
Current methods for extracting DNA or RNA from solutions are complex, require expensive machinery, and are not suitable for point-of-care applications due to their bulkiness, energy inefficiency, and potential for contamination, making them unsuitable for use outside laboratory settings.
Innovation Solution
A method using a magnetically susceptible member that moves in a straight line within a fluid chamber, minimizing energy consumption by utilizing a magnetic field generating system with permanent magnets or electromagnets to attract the member along a closed path, reducing the need for additional mechanisms and allowing gravity to aid movement, thus simplifying the system and reducing wear and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automated machinery with moving parts is used to mix magnetic beads, then extraction can be automated, but the device becomes bulky and complex
Solution Approach 1:
The patent replaces mechanical mixing systems with electromagnetic fields to manipulate magnetic beads. Electromagnets or permanent magnets generate magnetic fields that cause the beads to move, mix, and separate without mechanical contact, eliminating the need for bulky mechanical mixers and reducing device complexity while maintaining automation.
Solution Approach 2:
The patent uses magnetic fields as an intermediary to transfer energy and control the magnetic beads. Instead of direct mechanical contact, the electromagnetic field acts as a mediator to induce motion in the beads, enabling automated mixing and separation functions without mechanical components.
2Productivity
If aggressive agitation is used to mix magnetic beads, then mixing efficiency improves, but energy consumption increases
Solution Approach 1:
The patent employs magnetic vibration and oscillation to mix the beads. By rapidly switching or oscillating the magnetic field, the beads experience vigorous vibration and movement that achieves thorough mixing without the high energy costs of mechanical agitation. The vibrational energy efficiently distributes beads throughout the sample.
Solution Approach 2:
The patent uses periodic switching of electromagnetic fields to create cyclic motion in the magnetic beads. This periodic action—alternating attraction and release—creates effective mixing through repeated cycles of movement, achieving high productivity with lower average energy consumption compared to continuous aggressive agitation.
3Reliability
If manual bead removal is performed, then contamination risk increases, but automated systems require multiple consumables
Solution Approach 1:
The patent replaces manual mechanical removal of beads with electromagnetic manipulation. The same electromagnets used for mixing can selectively concentrate and hold beads at specific locations, enabling automated transfer and processing without manual intervention. This eliminates contamination risks while using the same consumable containers throughout the process.
Solution Approach 2:
The patent makes the electromagnetic system multi-functional, using the same magnets and containers for mixing, separating, concentrating, and transferring beads. This universal approach eliminates the need for multiple specialized consumables and manual handling steps, improving reliability by maintaining a closed system throughout the extraction process.
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 approach enables efficient and energy-efficient extraction of DNA or RNA, reducing contamination risks and allowing the process to be performed in a more compact, reliable, and efficient manner, suitable for point-of-care use by minimizing equipment complexity and energy usage.
Implementation Method 1
a magnetic field generating system with permanent magnets or electromagnets to attract the member along a closed path
Implementation Method 2
allowing gravity to aid movement
Implementation Method 3
mix the solution with magnetic beads that have a treated surface that can bind specifically to DNA and/or RNA
Data Source
Figure 1
Figure 2A~2C
Figure 2D~2F
AI summary
There is provided a method of extracting material from a fluid method of extracting material from a fluid, the fluid being held within a fluid chamber. Thee method comprises drawing, with a magnetic field generating system, at least one magnetically susceptible member through the fluid around a closed path between at least three points in the chamber, said at least one member being adapted to bind to material in fluid in the chamber. The at least three points are arranged relative to each other in a shape having at least two dimensions, the magnetic field generating system being configured to move the at least on magnetically susceptible member directly between the at least three points, material in the fluid binding to the at least one magnetically susceptible member when it comes into contact with the at least one member as it moves through the fluid.