Magnetic Bead Transfer Using a Tube Cap Magnet
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Solution Overview
Problem
Current devices for manipulating magnetic beads, such as magnetic tube racks and automated instruments, are either not portable or require skilled technicians, leading to disposal issues and inaccurate liquid measurement in field-based applications, and automated instruments are not suitable for processing small numbers of samples.
Innovation Solution
A device and process that allows magnetic beads to be manipulated using a magnet attached to a tube cap, enabling separation and transfer of beads without the need for pipetting or precise liquid measurement, suitable for use by minimally skilled operators in the field or laboratory, using pre-filled tubes for efficient bioassays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic tube racks are used for manual processing, then portability is improved, but disposal problems and contamination risks worsen due to liquid waste generation
Solution Approach 1:
The invention extracts the magnetic beads from the liquid solution using a magnet, allowing the beads to be separated and retained while the liquid is discarded. This extraction process eliminates the need to dispose of large volumes of liquid waste, as only the small magnetic beads are removed from the solution.
Solution Approach 2:
The invention uses disposable microplate wells that can be easily discarded after use, eliminating the need for complex disposal systems. The microplate wells are inexpensive and single-use, reducing both disposal complexity and contamination risks compared to reusable tube racks.
2Productivity
If automated instruments are used for processing, then processing capability is improved, but portability and suitability for small numbers of samples worsen
Solution Approach 1:
The invention segments the sample processing into individual microplate wells, each capable of being processed independently. This segmentation allows the system to handle small numbers of samples efficiently while maintaining the ability to scale up if needed, and each well can be processed with simple manual operations rather than requiring complex automated instrumentation.
Solution Approach 2:
The invention uses magnetic beads as an intermediary substance that facilitates the separation and concentration of target molecules. The beads can be easily manipulated with a magnet, allowing for simple and portable processing of samples without requiring complex automated instruments.
3Ease of operation
If pipetting and pouring are used for liquid handling, then liquid transfer is achieved, but measurement precision and contamination risks worsen
Solution Approach 1:
The invention allows the magnetic beads to self-concentrate at the bottom of the microplate well using magnetic attraction, eliminating the need for manual pipetting or pouring operations. The beads automatically accumulate at the magnet location, providing precise and reproducible liquid handling without requiring skilled technical operations.
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
Enables efficient processing of magnetic beads in the field or laboratory with minimal equipment and skill, reducing contamination risks and disposal issues, while allowing for accurate and repeatable bioassay processes.
Implementation Method 1
a tube or microplate holding a liquid sample including magnetic beads is placed into the rack next to a magnet that is embedded in the rack. The beads collect near the bottom of the tube or plate adjacent to the magnet
Data Source
AI summary
Various devices are described for separating magnetic beads from a suspension in a tube. The devices allow a magnet to be placed near, or removed from, a cap associated with the tube. Magnetic beads can be attached to the cap by holding the tube such that the suspension flows onto an inner surface of the cap. The cap may be removed and replaced on a tube or moved to a different tube. Removing the device, or a magnet of the device, allows the magnetic beads to be released into a liquid in a tube. In a kit, a plurality of tubes may be pre-filled with reagents for an assay. In a process, the device can be used to move magnetic beads from one tube to another. Other devices and process are described for separating magnetic beads from liquid in a syringe or flowing into or out of a syringe.