Optofluidic Cell Stretching System for High-Throughput Deformability Analysis
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Solution Overview
Problem
Conventional methods for characterizing cell deformability, such as micropipette aspiration and optical tweezers, involve direct physical contact and static conditions, leading to low throughput and potential cell damage, while microfluidic devices deform cells quickly but lack comparability with static stiffness measurements.
Innovation Solution
An optofluidic system combining microfluidic flow and optical tweezers to trap and stretch cells away from channel walls, allowing non-contact, continuous characterization of multiple cells with high throughput by generating microfluidic flow and using image processing to determine deformation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct physical contact techniques (micropipette aspiration, atomic force microscopy) are used to measure cell deformability, then measurement precision is improved, but cell damage occurs and throughput decreases
Solution Approach 1:
The patent replaces direct mechanical contact measurement systems with an optical measurement system. Optical tweezers use light fields to manipulate and measure cell deformability without physical contact, eliminating mechanical damage while maintaining measurement precision. The system uses optical forces to stretch cells and optical imaging to quantify deformation.
Solution Approach 2:
The patent introduces microfluidic flow as an intermediary to apply controlled stress to cells. Instead of direct mechanical contact, the cell is subjected to fluidic forces in a microchannel while being optically trapped, allowing indirect mechanical loading without solid-surface contact that could damage the cell.
2Reliability
If static test conditions are used in optical tweezers to minimize fluidic stress effects, then measurement reliability is improved, but characterization throughput decreases to approximately 10 cells per hour
Solution Approach 1:
The patent transitions from static to dynamic measurement conditions by flowing cells through a microchannel while trapped by optical tweezers. The cell is stretched by the fluidic flow at controlled velocities, and the dynamic deformation process is captured by high-speed imaging. This dynamic approach maintains measurement reliability while enabling continuous high-throughput characterization.
Solution Approach 2:
The patent implements continuous cell delivery and measurement by flowing cells through the microchannel in sequence. Each cell is trapped, stretched by the flow, imaged, and released continuously without interruption, enabling high-throughput characterization at rates exceeding 100 cells per hour compared to static methods.
3Productivity
If microfluidic devices deform cells at high speed through narrow channels, then productivity is improved, but measurement comparability with static stiffness decreases and imaging requirements become excessively high
Solution Approach 1:
The patent uses optical tweezers as an intermediary to trap and hold cells at a specific position in the microchannel while the flow stretches them. This optical trapping allows controlled deformation at moderate speeds and enables the use of standard imaging systems rather than requiring ultra-high-speed cameras, while maintaining throughput advantages.
Solution Approach 2:
The patent optimizes the flow velocity and optical trap strength parameters to achieve a balance between deformation speed and measurement accuracy. By controlling the flow rate and laser power, the system achieves measurable deformation within the capabilities of standard high-speed cameras (1000 fps) while maintaining throughput significantly higher than static methods.
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 efficient, non-contact, and high-throughput characterization of cell deformability, facilitating statistically relevant results without cell damage, and distinguishing healthy from unhealthy cells based on deformation characteristics.
Implementation Method 1
an optical tweezer system configured to generate an optical tweezer directed towards the at least one microfluidic channel
Implementation Method 2
generate, using the microfluidic pump of the microfluidic flow system, a microfluidic flow to stretch the plurality of trapped sample isolates
Implementation Method 3
an image processing system configured to capture images of the plurality of sample isolates within the at least one microfluidic channel
Data Source
AI summary
A method for stretching a plurality of sample isolates, including: trapping the plurality of sample isolates away from a wall of at least one microfluidic channel of a microfluidic flow system; generating a microfluidic flow to stretch the plurality of trapped sample isolates; determining deformation characteristics of the plurality of stretched samples isolates based on one or more frames from an image processing system; and outputting information corresponding to the deformation characteristics.