Magnetic Bead Optical Detection in Opaque Fluids
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Solution Overview
Problem
Existing optical detection systems struggle to accurately detect substances in opaque fluids due to absorption and scattering of emitted wavelengths, requiring pre-processing of samples which increases costs and complexity.
Innovation Solution
An optical detection system that uses magnetic beads attached to reactive agents, which are manipulated magnetically to the detection window, minimizing fluid between the agents and the optical system and reducing background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fluorescent or chemiluminescent agents are used to detect substances in opaque fluids, then the detection capability is provided, but the detection accuracy deteriorates due to absorption and scattering of emitted wavelengths
Solution Approach 1:
The patent extracts the detecting agents from the bulk opaque fluid and concentrates them at the detection interface (window) where optical measurement occurs. This separation allows the agents to be positioned in a location with minimal optical path through the opaque fluid, thereby maintaining detection capability while improving measurement accuracy by reducing absorption and scattering effects.
Solution Approach 2:
The patent transitions from bulk three-dimensional detection in the fluid volume to two-dimensional surface detection at the fluid-window interface. By moving the detection plane to the interface and using magnetic beads to concentrate agents there, the system achieves accurate optical measurements without requiring the entire fluid volume to be transparent.
2Reliability
If sample pre-processing (filtering and chemical treatment) is performed to improve transparency, then measurement reliability is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces mechanical/chemical pre-processing systems (filters, chemical treatment apparatus) with a magnetic field-based concentration system. Magnetic beads respond to magnetic fields to automatically concentrate detecting agents at the detection interface, achieving reliable measurements without complex mechanical filtering or chemical treatment equipment.
Solution Approach 2:
The magnetic beads self-concentrate at the detection interface when exposed to a magnetic field, automatically positioning the detecting agents where needed without requiring external manipulation or complex sample preparation steps. This self-organizing behavior simplifies the overall system while maintaining measurement reliability.
3Measurement precision
If magnetic beads are used to concentrate agents at the detection window, then sensitivity and reliability are enhanced, but device complexity increases due to magnetic manipulation requirements
Solution Approach 1:
The magnetic beads serve multiple functions: they provide structural support for attaching detecting agents, enable magnetic manipulation for concentration and retention at the detection interface, and can potentially serve as contrast agents themselves. This multi-functionality reduces the need for separate components, offsetting the added complexity with functional integration.
4Measurement precision
If the amount of fluid between agents and optical system is minimized, then background optical noise is reduced, but the ability to detect substances in bulk fluid is compromised
Solution Approach 1:
The system performs preliminary action by pre-concentrating the detecting agents at the detection interface before the actual measurement occurs. Magnetic beads are positioned at the window in advance, and agents are concentrated there through magnetic manipulation, ensuring high local concentration for sensitive detection before the measurement process begins.
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 enhances sensitivity and reliability of optical detection, allows detection in opaque fluids without pre-processing, and reduces system costs by simplifying disposable components.
Implementation Method 1
The use of magnetic beads, attached to the agents, together with the use of magnetic source, allows a magnetic manipulation of the beads-agent complexes in such a way that they are magnetically moved (attracted or repulsed depending on the magnet polarity) to the window for detection purpose.
Implementation Method 2
The fluorescent or luminescent response is difficult to detect in opaque samples due to absorption and scattering of the emitted wavelengths in the samples.
Implementation Method 3
From the various available technologies enabling the detection of particles in a fluid, it is known the use of fluorescent or chemiluminescent agents in a biological sample, which enables the production or the change of a fluorescent or luminescent response as a result of their interactions with some specific substances present in the sample.
Implementation Method 4
The detection of those optical responses gives then an indication of the presence or concentration of those substances (e.g. glucose) in the sample.
Data Source
AI summary
The invention relates to a system (1) for optically detecting at least one substance in a fluid (200). The system (1) comprises particles (400, 410) arranged to be dispersed in the fluid (200), each one comprising a magnetic bead (400) and an agent (410). The agent (410) is reactive with said substance such that it gives a specific optical response upon a determined optical excitation or a chemical reaction. The system (1) further comprises a chamber (330) to contain said fluid (200) and particles (400, 410). The chamber (330) is closed at one side by a window (310) optically transparent to the wavelengths of said optical response and said optical excitation. The system (1) further comprises an optical reading system (100) adapted to detect at least a portion of said optical response. The system (1) further comprises magnetic sources (103) arranged to magnetically move the particles (400, 410) onto or close to the window (310). The optical reading system (100) is positioned to receive at least a portion of the optical response from the at least one agent (410) located onto or close to the window (310). The invention relates further to a disposable and a method.