Optical Nanoparticle Viscometry for Small-Volume Plasma Testing
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Solution Overview
Problem
Existing devices for measuring blood plasma viscosity require large sample sizes, direct fluid handling, and lengthy measurement times, making them impractical for home use and point-of-care applications, and are costly due to the need for commercial laboratories.
Innovation Solution
An optical force diagnostic system using laser beams to move nanoparticles in a fluid, measuring viscosity by analyzing the time it takes for nanoparticles to reach equilibrium after being dragged by a high-power laser and probed by a low-power laser, allowing for rapid and accurate viscosity measurements with a small sample size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional viscometers (cone and plate, capillary) are used to measure blood plasma viscosity, then measurement accuracy is achieved, but sample size requirement increases to approximately 1000 microliters
Solution Approach 1:
The patent replaces conventional mechanical viscometry systems (cone and plate, capillary) with an optical trapping system using laser beams to manipulate nanoparticles. The optical forces exerted by the laser on nanoparticles allow viscosity measurement through particle motion analysis, eliminating the need for large sample volumes while maintaining measurement capability. This substitution of mechanical measurement with optical manipulation enables precise viscosity measurement in microfluidic volumes.
Solution Approach 2:
The patent introduces nanoparticles as intermediary objects that mediate between the measurement system and the fluid medium. These nanoparticles serve as tracers whose motion under optical forces reveals viscosity information. By using nanoparticles as intermediaries, the system can measure viscosity of the surrounding plasma with minimal sample volume, as the particles' hydrodynamic behavior reflects the medium's viscous properties.
2Measurement precision
If conventional viscometers are used for blood plasma viscosity measurement, then accurate results are obtained, but measurement time increases to approximately 20 minutes
Solution Approach 1:
The patent replaces slow mechanical viscometry with rapid optical measurement. The laser trapping and particle tracking system captures nanoparticle motion dynamics in real-time, allowing viscosity determination from particle relaxation or drift behavior. This optical approach reduces measurement time from 20 minutes to seconds or minutes, as the optical forces act instantaneously and particle positions can be tracked continuously with high temporal resolution.
Solution Approach 2:
The system performs preliminary actions by pre-positioning nanoparticles in the measurement volume and establishing optical trapping conditions before the actual measurement begins. The nanoparticles are already distributed and ready for observation, so when the measurement is initiated, the system immediately starts tracking particle motion under applied optical forces, eliminating setup time and enabling rapid sequential measurements.
3Measurement precision
If conventional viscometers are used for viscosity measurement, then measurement capability is achieved, but device cost increases and home use becomes unfeasible
Solution Approach 1:
The patent replaces complex mechanical viscometer assemblies with a simplified optical system consisting of laser sources, detectors, and control electronics. The mechanical components (rotating elements, capillary tubes, temperature control systems) are replaced by optical fields and electronic detection, reducing mechanical complexity. The system can be integrated into compact form factors suitable for point-of-care or home use while maintaining measurement capability through optical manipulation of nanoparticles.
Solution Approach 2:
The system employs self-service mechanisms where the nanoparticles themselves serve as both the measurement probe and the tracer. The particles' natural Brownian motion and hydrodynamic interaction with the medium provide the measurement signal without requiring external mechanical actuators or complex sample preparation. The optical system automatically tracks particle positions and calculates viscosity from the observed motion, enabling automated operation with minimal user intervention and reduced operational complexity.
4Measurement precision
If conventional viscometers require direct fluid handling, then measurement is performed, but ease of operation decreases and cleaning requirements increase
Solution Approach 1:
The patent uses nanoparticles as intermediaries that are suspended in the fluid sample, allowing indirect measurement without direct contact between the measurement system and the bulk fluid. The particles serve as proxies for measuring medium properties, eliminating the need for direct fluid handling, pumping, or contact with sensitive measurement components. This approach simplifies operation as users only need to introduce the sample containing particles, and the system automatically performs measurement without cleaning requirements between samples.
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 rapid, accurate viscosity measurements of biofluids like blood plasma with a small sample size, suitable for point-of-care diagnostics, reducing the need for laboratory assistance and lowering costs.
Implementation Method 1
Optical tweezers or single-beam gradient force traps arescientific instruments that use a highly focused laser beam to hold and move microscopic and sub-microscopic objects or particles
Implementation Method 2
The use of a probe beam for exciting fluorescent nanoparticles, a fluorescence from liquid medium with scattering nanoparticles
Implementation Method 3
The use of a probe beam for exciting fluorescent nanoparticles, a fluorescence from liquid medium with scattering nanoparticles
Implementation Method 4
A particle, such as a nanoparticle, in a light field will experience a force represented by the gradient of the energy in the light field and also a viscous drag when the particle moves through the medium
Data Source
AI summary
A system and associated methods including a first light source directed at a sample, the first light source configured to move a plurality of particles within a medium of the sample in response to irradiation by the first light source; a second light source directed at the sample, the plurality of particles providing an optical response to irradiation by the second light source; and a detection system directed at the sample and capable of detecting the optical response of the plurality of particles moved by the first light source and irradiated by the second light source.