Integrated Inertial Pump and Passive Separation Structure
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Solution Overview
Problem
Microfluidic devices face challenges in efficiently separating and analyzing particles due to the complexity and potential failure of external pumps and sensors, which can lead to slowed flow and system failures, and require separate systems for separation and analysis, increasing complexity and the risk of errors during transitions.
Innovation Solution
The integration of passive separation structures, such as arrays of columns, and inertial pumps within the microfluidic device to facilitate the separation and analysis of particles, allowing for efficient sorting and identification of cells without the need for external pumps, and enabling post-processing through antibody binding in an integrated system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external pumps and sensors are used for particle separation, then particle sorting capability is improved, but device complexity and risk of system failure increase
Solution Approach 1:
The patent merges the pumping function into the separation structure itself by integrating inertial pump elements (such as constrictions, expansions, or asymmetric features) directly into the separation chamber geometry. This eliminates the need for external pumps while maintaining particle sorting capability, thereby reducing device complexity and potential failure points.
Solution Approach 2:
The separation structure is designed to perform multiple functions simultaneously: it acts as both the separation medium and the pumping mechanism. The same structural features that create flow patterns for separation also generate inertial forces for particle manipulation, eliminating the need for separate pumping components.
2Speed
If external pumps are used to facilitate particle flow, then flow control is improved, but potential for system failure and handling errors increases
Solution Approach 1:
The system uses the particle flow itself and the separation structure geometry to generate the pumping action. The flow-induced inertial forces automatically regulate particle movement through the separation chamber without requiring external control, eliminating failure points associated with external pump systems.
Solution Approach 2:
The patent replaces mechanical pump systems with a passive inertial mechanism where flow-induced forces and geometric constraints work together to achieve particle separation. This substitution eliminates moving parts and mechanical failure modes while maintaining flow control capability.
3Adaptability or versatility
If separate systems are used for separation and analysis, then functional specialization is improved, but complexity and transition errors increase
Solution Approach 1:
The patent combines the separation chamber and analysis chamber into a single integrated microfluidic device with continuous flow. Particles are separated in the first chamber and directly transported to the analysis chamber without external intervention, eliminating transition errors while maintaining functional specialization through distinct chamber designs.
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
This approach simplifies the process by reducing complexity, minimizing the risk of system failures, and allowing for efficient, integrated separation and analysis of particles within a single microfluidic device, eliminating the need for external components and reducing handling errors.
Implementation Method 1
The device includes at least one integrated pump, such as an inertial pump, in the input channel or an output channel to facilitate flow of the particles
Implementation Method 2
The passive separation structure may include columns, or posts, that are spaced apart in a manner which directs particles in the flow along different paths based on the size of the particles
Implementation Method 3
The output channel may include regions comprising arrays of antibodies. The particle (e.g., cell) in an output channel may be identified based on the region in which the particle binds to an antibody
Data Source
AI summary
An example system includes an input channel to receive particles through a first end, a separation chamber, at least two output channels, an integrated pump to facilitate flow through the separation chamber and a cell analysis portion. The separation chamber is in fluid communication with a second end of the input channel. The separation chamber has a passive separation structure including an array of columns spaced apart to facilitate separation of particles into at least two flow paths based on a size of the particles. The size associated with a first flow path of the at least two flow paths corresponds to a cell. A first output channel is to receive the first flow path corresponding to a cell. The cell analysis portion is coupled to the first output channel and is to perform at least one analysis associated with cells in the first output channel.