Magnetic Particle Probe Release Mechanism for High Concentration
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Solution Overview
Problem
Existing methods for releasing magnetic particles from a probe to a liquid medium often result in low concentration ratios and inefficient particle separation, especially when dealing with large initial volumes and low substance concentrations.
Innovation Solution
Magnetic particles are released from a probe onto a plate using a magnet placed below the surface, which can be dry or have a liquid film, allowing for high concentration ratios by utilizing a release magnet to attract the particles as a concentrated spot onto the plate, either dry or with a small liquid film, facilitating efficient separation and washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If magnetic particles are released into a large liquid volume, then the particles are easily washed off, but the concentration ratio becomes low and the particles are diluted
Solution Approach 1:
The invention transitions from releasing particles into a bulk liquid volume (3D) to releasing them onto a two-dimensional plate surface. This dimensional change allows the particles to be concentrated on a surface rather than dispersed in a volume, achieving high concentration ratios while using minimal liquid for washing.
Solution Approach 2:
The invention changes the physical state and configuration of the release medium from a large liquid volume to a dry or minimally wetted plate surface. By controlling the liquid volume parameter to be minimal (just enough to wet the surface), the concentration ratio is maximized while still allowing particle release and subsequent washing.
2Quantity of substance
If a magnet is placed below the plate to attract particles, then the particles are concentrated on a small area, but the device complexity increases
Solution Approach 1:
The plate itself is designed to be magnetically responsive or to work in conjunction with a simple external magnet. The plate serves dual functions: as a support surface for particle concentration and as part of the magnetic assembly. This eliminates the need for complex separate magnetic holding mechanisms.
Solution Approach 2:
The plate serves multiple functions: it acts as a support structure, a magnetic interaction surface, and a transfer medium for particles. By making the plate multi-functional, the need for additional complex components is reduced, as the plate itself participates in the magnetic concentration process.
3Quantity of substance
If the plate surface is dry, then the concentration ratio is maximized, but the particles may not release easily from the probe
Solution Approach 1:
The plate surface is pre-wetted with a minimal amount of liquid before particle release. This preliminary action creates a thin liquid film that facilitates particle transfer from the probe while ensuring that the total liquid volume remains minimal, thus maintaining high concentration ratios after the liquid evaporates or is removed.
Solution Approach 2:
The invention utilizes the phase transition of liquid to vapor. A minimal amount of liquid is applied to the plate surface to facilitate particle release, and then the liquid is allowed to evaporate, leaving the particles concentrated on the dry surface. This phase transition enables easy particle release while achieving high concentration.
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 method achieves very high concentration ratios, enabling effective processing and microscopic analysis of low-concentration substances by concentrating particles on a small area, such as a microscope slide, with minimal residual liquid, enhancing the efficiency of particle separation and microscopic study.
Implementation Method 1
magnetic particles are released from a probe on a plate with the help of a magnet placed below the surface of the plate
Implementation Method 2
The collected particles may be released into a very small liquid volume by utilizing liquid adhesion, whereby the particles are washed off by a small liquid amount that wets the surface on which the particles have been collected
Data Source
AI summary
The invention concerns a method for processing magnetic particles, which selectively interact with a substance present in a liquid medium. The particles are collected with a probe (2) comprising a hollow shield (4) and a probe magnet (3) moveable up and down. The lower end of the probe with the collected particles is placed on a release location (7) of a plate (6), below which release location there is a release magnet (8). The surface of the release location is dry or has a liquid film or a drop on it. In accordance with the invention, very high concentration ratios can be achieved.