MEMS Particle Sorting with Laser Interrogation
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Solution Overview
Problem
Existing cell sorting technologies, such as flow cytometers, are large, expensive, and inefficient, causing cell damage, requiring complex sterilization, and are inaccessible to smaller entities due to their complexity and cost, while MEMS-based systems face limitations in sorting sub-populations and maintaining equipment.
Innovation Solution
A MEMS-based particle sorting system using microfabricated fluid channels with multiple laser interrogation regions for real-time cytometric capability, allowing for precise manipulation and sorting of particles by heating, tagging, charging, or destroying them, with a flap-type actuator diverting particles based on fluorescent signals, and additional interrogation regions for confirming performance and adjusting parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow cytometers are used for cell sorting, then sorting capability is achieved, but system size and cost increase substantially
Solution Approach 1:
The system divides the cell sorting function into separate microfabricated modules including interrogation regions, manipulation stages, and fluidic channels, allowing the complex sorting capability to be achieved through integrated miniaturized components rather than a single large system
Solution Approach 2:
The patent transitions from conventional large-scale flow cytometry to microfabricated three-dimensional structures with multiple interrogation regions positioned at different locations, enabling sophisticated sorting capabilities within a compact footprint by utilizing spatial dimensionality efficiently
2Productivity
If rapid decompression through nozzle is used for droplet separation, then sorting speed increases, but cell damage occurs
Solution Approach 1:
The patent extracts the harmful rapid decompression step from the sorting process and replaces it with gentle microfabricated manipulation stages that achieve separation without subjecting cells to damaging pressure changes
Solution Approach 2:
The system replaces the mechanical rapid decompression mechanism with optical detection and controlled microfabricated actuation, substituting a harsh mechanical process with gentler optical and micro-mechanical methods that preserve cell integrity
3Measurement precision
If fluorescence-activated detection is used for particle identification, then sorting accuracy improves, but system complexity and cost increase
Solution Approach 1:
The patent combines multiple interrogation regions with fluorescence detection and manipulation stages into a single integrated microfabricated device, reducing system complexity by merging functions that would traditionally require separate systems
Solution Approach 2:
The microfabricated device performs multiple functions including particle interrogation, fluorescence detection, and manipulation within a single universal platform, eliminating the need for separate specialized equipment and reducing overall system complexity
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
The system enables efficient, accurate, and real-time sorting and manipulation of particles with improved cytometric capability, reducing cell damage, simplifying operation, and making advanced sorting accessible to smaller entities by providing real-time feedback and optimization of sorting parameters.
Implementation Method 1
This signal may be a photon from a fluorescent tag which is affixed to the target particle and excited by laser illumination in an interrogation region upstream of the MEMS device
Implementation Method 2
laser light directed into at least one additional laser interrogation region in a second portion of a microchannel formed in the substrate downstream of the particle manipulation stage
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3b
AI summary
A MEMS-based particle manipulation system which uses a particle manipulation stage and a plurality of laser interrogation regions. The laser interrogation regions may be used to assess the effectiveness or accuracy of the particle manipulation stage. In one exemplary embodiment, the particle manipulation stage is a microfabricated, flap-type fluid valve, which sorts a target particle from non-target particles in a fluid stream. The laser interrogation stages are disposed in the microfabricated fluid channels at the input and output of the flap-type sorting valve. The laser interrogation regions may be used to assess the effectiveness or accuracy of the sorting, and to control or adjust sort parameters during the sorting process.