MEMS Multisort Valve for Faster, More Accurate Particle Sorting
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Solution Overview
Problem
Existing fluorescence-activated cell sorting systems (FACS) are large, expensive, and require substantial training, leading to limited accessibility for smaller entities, and MEMS-based cell sorting devices face challenges in sorting speed and accuracy due to high pressure resistance and inefficient particle focusing.
Innovation Solution
A MEMS-based particle sorting system with out-of-plane microfabricated channels and a movable member that minimizes pressure resistance, combined with hydrodynamic focusing and a multisort valve for faster actuation and improved accuracy, using electromagnetic actuation for redirecting particles into multiple output channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional in-plane microfabricated channels are used for particle sorting, then the device structure is simpler, but the pressure resistance is high and actuation time is long
Solution Approach 1:
The patent transitions from traditional in-plane microchannels to out-of-plane three-dimensional microchannels. The sample inlet channel and sort output channel are positioned in different planes, with the movable member bridging between them. This dimensional change reduces the fluid column height that the valve must move, thereby reducing pressure resistance and actuation time while improving sorting speed.
2Measurement precision
If particles are not focused before sorting, then the system is simpler, but sorting accuracy is reduced due to particle position uncertainty
Solution Approach 1:
The patent incorporates a hydrodynamic focusing element upstream of the movable member that pre-focuses particles into a defined position within the fluid stream before they reach the sorting region. This preliminary focusing action reduces positional uncertainty and improves sorting accuracy without requiring complex post-positioning mechanisms.
3Adaptability or versatility
If a single sort output channel is used, then the device is simpler, but the ability to re-sort sub-populations is limited
Solution Approach 1:
The patent designs the movable member and control system to enable dynamic routing of particles to multiple sort output channels based on real-time detection signals. The system can direct different particle sub-populations to different output channels or perform sequential sorting operations, providing multi-functionality and adaptability for various sorting scenarios without requiring a fixed single-output architecture.
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 achieves faster sorting rates and higher accuracy by reducing actuation time and enhancing particle focusing, enabling efficient particle manipulation in microfluidic channels with improved sorting speed and reduced operational complexity.
Implementation Method 1
the movable member moves from a first position to a second position in response to a sort waveform applied to an actuator, which generates a force to move the movable member
Implementation Method 2
A MEMS-based particle sorting system with out-of-plane microfabricated channels and a movable member that minimizes pressure resistance
Implementation Method 3
combined with hydrodynamic focusing and a multisort valve for faster actuation and improved accuracy
Data Source
AI summary
A particle manipulation system uses a MEMS-based, microfabricated particle manipulation device which has a sample inlet channel, output channels, and a movable member formed on a substrate. The device may be used to separate a target particle from non-target material in a sample stream. In order to improve the sorter speed, accuracy or yield, the particle manipulation system may also include a microfluidic structure which focuses the target particles in a particular portion of the sample inlet channel. The multiple outputs may be implemented using structures outside of, and in addition to, the microfabricated sorter. These may include pneumatic valves, which may transfer the contents of one fluid receptacle to another. This may enable simple and inexpensive serial sorting.