Micro-particle Separation Using Slanted Channel Protrusions
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Solution Overview
Problem
Existing methods for separating micro-particles, such as centrifugal separators and microfluidic devices, are either expensive, difficult to use in emergency situations, or have efficiency issues that vary with fluid velocity, making them inadequate for efficient particle separation in all contexts.
Innovation Solution
A micro-particle separating apparatus with a channel and protruding slanted and vertical elements that control particle movement based on size, allowing for efficient separation regardless of fluid velocity, by directing critical particles to specific regions of the outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centrifugal separators are used to separate cells from suspensions, then separation capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical centrifugal separation systems with a microfluidic device that uses controlled fluid flow through channels with specific geometric features (protrusions and recesses) to achieve particle separation based on size, eliminating the need for expensive and complex centrifugal equipment
Solution Approach 2:
The invention changes the separation mechanism from centrifugal force-based to flow velocity and channel geometry-based separation. By controlling fluid flow parameters and channel dimensions, the device achieves effective separation of particles ranging from 1-50 micrometers without requiring complex mechanical systems
2Reliability
If dielectrophoretic devices are used for cell separation, then separation efficiency is improved at certain velocities, but efficiency decreases as fluid velocity increases
Solution Approach 1:
The patent introduces channel protrusions and recesses at specific locations within the microfluidic channel to create localized flow disturbances. These structural features generate secondary flows and velocity variations in specific regions that enhance particle separation efficiency regardless of the overall fluid velocity, allowing effective separation across a wide range of flow rates
3Reliability
If inertial fluidic devices are used for cell separation, then separation efficiency is improved at certain velocities, but efficiency decreases as fluid velocity decreases
Solution Approach 1:
The patent incorporates channel protrusions and recesses that create localized flow patterns and velocity distributions independent of the bulk flow rate. These geometric features generate consistent secondary flows and particle migration effects that maintain separation efficiency across varying fluid velocities, overcoming the velocity-dependent limitations of conventional inertial fluidic devices
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 apparatus effectively separates micro-particles by their size, concentrating them in certain regions of the outlet, regardless of fluid velocity, thereby overcoming the limitations of existing technologies and facilitating efficient particle separation without the need for precise velocity control.
Implementation Method 1
a channel through which a fluid flows; and a separating part protruding into the channel... The fluid flow may be in the direction of the length direction of the channel or opposite the length direction of the channel
Data Source
AI summary
An apparatus for separating micro-particles includes a channel through which a fluid flows, and a separating part protruding into the channel and including a slanted element inclined toward a length direction of the channel and a vertical element perpendicular to the length direction of the channel.