Integrated Microfluidic Platform for Selective Particle Coupling
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Solution Overview
Problem
Microfluidic devices face challenges in efficiently coupling target particles with a second set of particles, leading to inefficient utilization of the second set of particles, especially when target particles are a minority, and diverse detectable features are not effectively leveraged.
Innovation Solution
Developed devices and processes actively couple target particles with a second particle by detecting the target particle and then releasing the second particle in proximity, using pressure or electric fields, with a constriction in the second fluidic channel to control release, and incorporating a pressure relief line to ensure efficient orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive coupling methods are used to combine target particles with a second set of particles, then the device complexity is reduced, but the utilization efficiency of the second set of particles decreases significantly
Solution Approach 1:
The patent implements preliminary action by pre-positioning the second set of particles in a holding channel before the coupling event. Detection of the target particle triggers a controlled release mechanism that propels the pre-positioned second particles toward the target, ensuring immediate and efficient coupling without requiring complex real-time tracking or dynamic adjustment during the coupling process itself.
Solution Approach 2:
The patent replaces complex mechanical coupling mechanisms with a field-based approach. Detection of the target particle triggers an electric field or pressure pulse that propels the second particles toward the target, eliminating the need for complex mechanical actuators, moving parts, or precision mechanical positioning systems while achieving high coupling efficiency.
2Ease of operation
If passive coupling is used, then the system is simpler to operate, but diverse detectable features of particles are not effectively leveraged
Solution Approach 1:
The patent implements feedback by using detection of particle features (such as fluorescence, scattering, or other detectable properties) to trigger the controlled release and coupling process. The detection system monitors particle characteristics and provides real-time feedback that activates the coupling mechanism only when appropriate target particles are identified, enabling the system to leverage diverse detectable features while maintaining automated operation.
Solution Approach 2:
The patent utilizes parameter changes in detectable features (such as fluorescence intensity, wavelength, or scattering patterns) to differentiate and selectively couple target particles from non-target particles. The detection system measures these varying parameters and uses them to control the release and coupling process, enabling versatile handling of diverse particle types while maintaining automated operation.
3Measurement precision
If target particles are a minority in the sample, then the analysis specificity is improved, but the efficiency of utilizing the second set of particles decreases
Solution Approach 1:
The patent implements preliminary action by pre-positioning multiple second particles in a holding channel ready for release. When a rare target particle is detected, the system releases all or a subset of the pre-positioned second particles simultaneously, ensuring that even when target particles are a minority, each detected target can be efficiently coupled with available second particles without requiring continuous searching or repeated release cycles.
Solution Approach 2:
The patent replaces complex mechanical systems with field-based propulsion to efficiently couple second particles with rare target particles. Detection triggers an electric field or pressure pulse that rapidly propels second particles toward the target, achieving high coupling efficiency even when targets are稀少, without requiring complex mechanical positioning or tracking systems that would reduce operational efficiency.
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
Enhances the utilization of the second set of particles by efficiently coupling them with target particles, reducing waste, and leveraging the diversity of detectable features, particularly when target particles are a minority.
Implementation Method 1
The first image sensor defines a first image sensor optical path that intersects the selection zone of a microfluidic chip, and is constructed to capture images of the particles in that zone. The first image sensor optical path includes an objective with a numeric aperture of less than 0.3.
Implementation Method 2
The plurality of lasers define a laser optical path that intersects the detection zone of the microfluidic chip, and are constructed to induce fluorescence excitation in the particles. The lasers may emit laser light at a plurality of wavelengths, including but not limited to the wavelengths of 405 nm, 488 nm, 561 nm, and 638 nm.
Implementation Method 3
The fluorescence detector assembly defines a fluorescence detector optical path that intersects the detection zone, and is constructed to detect the fluorescence excitation in the particles. The fluorescence detectors may be made of a silicon photomultiplier (SiPM).
Implementation Method 4
The second image sensor defines a second image sensor optical path that intersects the detection zone, and is constructed to capture images of the particles in that zone. The second image sensor optical path includes an objective with a numeric aperture of greater than 0.3.
Implementation Method 5
The first pump creates a pressure that is lower than the pressure created by the second pump. The first pump connected to the processor and delivers a pressure to the first solenoid valve, which is constructed to allow fluid communication between the first pump and either a vent or the second solenoid valve.
Implementation Method 6
The high-voltage pulse generator module includes a direct digital synthesis (DDS) module constructed to produce a modulated wave form; a power amplifier connected to the DDS constructed to receive and amplify the modulated wave form; a high-voltage transformer constructed to produce a high-voltage pulse based on the amplified modulated wave form.
Data Source
AI summary
The instrument for processing microscopic particles may include a combination of modules integrated into a functional system. The system may be composed of synchronized subsystems including pneumatic modules, fluorometers, multi-wavelength lasers, dual view microscopy, high-voltage generators and other subsystems designed to analyze and control microfluidic processes occurring on a chip. The system performs the combined functions of microfluidic particle generation, analysis, and selection, making it possible for the user to create custom integrated workflows for molecular and cell biology processing. Creating the integrated platform requires an innovative and multi-disciplinary approach for module mechanical integration, electronic synchronization and user interface design for controlling diverse microfluidic processes at high speed.