Microfluidic Chip Two-Step Focusing and Piezoelectric Sorting
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Solution Overview
Problem
Current separation techniques for particles or cellular materials, such as sperm, are time-consuming, inefficient, and cause damage, with limitations in throughput and applicability to biological and medical applications beyond sperm sorting.
Innovation Solution
A microfluidic chip system with laminar flow channels and a piezoelectric actuator assembly that compresses and orients sample fluid mixtures, allowing for continuous, high-throughput separation of cellular components with minimal damage, using sheath fluids and interrogation mechanisms to isolate specific components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current separation techniques are used for particles or cellular materials, then separation can be achieved, but the process is time-consuming and has low throughput
Solution Approach 1:
The patent replaces traditional mechanical separation systems with a microfluidic system that uses controlled laminar flows and acoustic fields to achieve separation. The microfluidic chip with multiple channels and the piezoelectric actuator assembly create precise fluid dynamics that enable high-throughput separation without mechanical contact, thereby increasing productivity while reducing processing time
Solution Approach 2:
The invention changes the flow regime parameters by maintaining laminar flow throughout the microfluidic channels. By controlling flow rates, channel dimensions, and using sheath fluids to compress sample streams, the system achieves continuous separation at high speeds. The piezoelectric actuator dynamically adjusts acoustic parameters to enhance separation efficiency, enabling both high throughput and rapid processing
2Reliability
If current separation techniques are used, then separation can be achieved, but damage is caused to the various components of the separation
Solution Approach 1:
The patent eliminates mechanical contact-based separation by using microfluidic laminar flow and acoustic field manipulation. The piezoelectric actuator generates acoustic waves that manipulate particle positions without physical contact, and the microfluidic channels guide flows gently, preserving the integrity of cellular materials while achieving effective separation
Solution Approach 2:
The invention introduces sheath fluids as intermediaries that compress and focus sample streams within the microfluidic channels. These sheath fluids act as protective mediators, controlling the hydrodynamic environment to prevent damage to sensitive components while enabling precise manipulation and separation of particles or cells
3Quantity of substance
If current separation techniques are used, then separation can be achieved, but volume restrictions are severe and yield is insufficient
Solution Approach 1:
The patent divides the separation process into multiple parallel channels within the microfluidic chip. The sample flow is segmented into smaller streams that can be processed simultaneously in different channels, increasing the overall processing volume and yield while maintaining the benefits of microfluidic laminar flow control
Solution Approach 2:
The invention implements continuous flow separation through the microfluidic chip, eliminating batch processing interruptions. The laminar flows continue uninterrupted through the channel network, allowing continuous input and output of samples, thereby increasing both the processing volume capacity and the overall yield of separable materials
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, continuous separation of cellular components with significant time savings and minimal damage, expanding applicability to various biological and medical applications beyond sperm sorting.
Implementation Method 1
the sheath fluids compress the sample fluid mixture on at least two sides, such that the sample fluid mixture becomes a relatively smaller, narrower stream, bounded by the sheath fluids, while maintaining laminar flow in the sample input channel
Implementation Method 2
the second plurality of sheath fluid channels which intersect the sample input channel at a second intersection downstream from the first intersection, in a second direction substantially 90 degrees above and below the sample input channel, such that the sheath fluids from the second plurality of sheath fluid channels compress the sample fluid mixture, such that the components in the sample fluid mixture are compressed and oriented in a predetermined direction, while still maintaining laminar flow in the sample input channel
Data Source
AI summary
A microfluidic chip orients and isolates components in a sample fluid mixture by two step focusing, where sheath fluids compress the sample fluid mixture in a sample input channel in one direction, such that the sample fluid mixture becomes a narrower stream bounded by the sheath fluids, and by having the sheath fluids compress the sample fluid mixture in a second direction further downstream, such that the components are compressed and oriented in a selected direction to pass through an interrogation chamber in single file formation for identification and separation by various methods. The isolation mechanism utilizes external, stacked piezoelectric actuator assemblies disposed on a microfluidic chip holder, or piezoelectric actuator assemblies on-chip, so that the actuator assemblies are triggered by an electronic signal to actuate jet chambers on either side of the sample input channel, to jet selected components in the sample input channel into one of the output channels.