Microfluidic Device for Senescent Cell Separation
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Solution Overview
Problem
Current microfluidic methods face challenges in efficiently isolating and removing senescent cells from biofluids due to issues like clogging, reduced throughput, and cell damage, particularly in processing whole blood samples, which limits their application in diagnostics and therapeutics.
Innovation Solution
A microfluidic device with a 3D array of obstacles oriented at an angle relative to the fluid flow direction is used, allowing for high-throughput separation and capture of senescent cells by exploiting their size differences, with features like tunable vertical spacing and peristaltic pumping to prevent clogging and maintain cell integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dead-end flow filtration is used to separate senescent cells, then separation efficiency is improved, but filter clogging and saturation occur resulting in reduced throughput and operation simplicity
Solution Approach 1:
The patent inverts the conventional dead-end filtration approach by implementing a tangential flow configuration where fluid flows parallel to the filter surface rather than perpendicular to it. This reversal prevents clogging by continuously sweeping particles along the filter surface, maintaining high throughput while preserving separation efficiency for isolating senescent cells from biofluids.
Solution Approach 2:
The patent transitions from one-dimensional dead-end filtration to two-dimensional tangential flow filtration by introducing a flow direction component parallel to the filter surface. This dimensional change creates a shear flow that prevents particle accumulation and filter saturation, enabling continuous high-throughput operation while maintaining separation performance.
2Reliability
If crossflow filtration with longer channel is used to decrease cell damage, then cell integrity is improved, but throughput is reduced below 1 mL/hour
Solution Approach 1:
The patent employs dynamic flow control with adjustable flow rates and shear forces to optimize the balance between cell integrity and throughput. By dynamically tuning the tangential flow velocity, the system maintains gentle handling of cells to prevent damage while achieving throughput exceeding 1 mL/hour, overcoming the static limitations of conventional crossflow filtration.
Solution Approach 2:
The patent changes key operational parameters including flow rate, shear stress, and channel geometry to simultaneously achieve high cell integrity and high throughput. By optimizing these parameters in the tangential flow configuration, the system exceeds 1 mL/hour throughput while maintaining cell viability, unlike conventional crossflow systems that are limited to below 1 mL/hour.
3Measurement precision
If conventional filtration methods are used to process whole blood, then rare cell separation is achieved, but clogging and saturation reduce separation efficiency and sample purity
Solution Approach 1:
The patent inverts the filtration approach from dead-end to tangential flow, preventing clogging by maintaining continuous fluid motion parallel to the filter surface. This inversion ensures consistent separation efficiency and sample purity when processing whole blood, as particles are swept along rather than accumulated, eliminating the clogging-saturation cycle that degrades performance in conventional 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
The solution enables efficient separation of senescent cells with high purity and viability, achieving throughputs greater than 250 mL/hour and maintaining cell integrity, suitable for point-of-care diagnostics and therapeutic applications.
Implementation Method 1
A microfluidic device with a 3D array of obstacles oriented at an angle relative to the fluid flow direction is used, allowing for high-throughput separation and capture of senescent cells by exploiting their size differences
Data Source
AI summary
The present disclosure provides methods and systems for separating one or more target analytes from a fluid sample. The systems may comprise a microfluidic device. The microfluidic device may comprise a fluidic channel having an array of obstacles disposed therein. The array of obstacles may be oriented at an angle greater than 0° relative to a direction of a fluid flow in the fluidic channel. The array of obstacles may be configured to separate the target analytes from the fluid upon flow of the fluid through the fluidic channel. The methods of the present disclosure may comprise separating target analytes from a fluid using a microfluidic device comprising obstacles disposed in a fluidic channel of the device. The target analytes may be separated with a high efficiency, sensitivity and/or specificity. Also disclosed herein are devices, methods, and systems for separating one or more biological particles from a fluid sample. The devices may comprise a substrate with a fluidic channel disposed therein. The fluidic channel has disposed therein an array of obstacles with a vertical spacing. The vertical spacing may be configured to separate one or more particles from a fluid stream when the stream flows through the fluidic channel. The devices, methods, and systems may be able to separate various types of biological particles at a high efficiency, sensitivity, and/or specificity.