Microfluidic Inertial Pump Check Valve for Fast Backflow Blocking
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Solution Overview
Problem
Existing microfluidic systems face challenges in designing pumps and valves at a small scale due to complexity, cost, and inefficiency, particularly in handling pressure heads and preventing backflow.
Innovation Solution
Inertial pumps with integrated check valves that utilize a fluid actuator to displace fluid and a moveable valve element with a narrowed channel segment and blocking element to control fluid flow, preventing backflow even against significant pressure heads, and responding quickly to fluid direction changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pumps and valves are used in microfluidic systems, then fluid flow control can be achieved, but the system complexity and cost increase significantly
Solution Approach 1:
The patent combines the pump and check valve functions into a single integrated microfluidic device. The pump chamber and valve mechanism share the same microfluidic channel structure, eliminating the need for separate pump and valve components. This integration reduces system complexity while maintaining fluid flow control capability through the unified design of moving walls that perform both pumping and valve functions.
2Reliability
If conventional valves are used to prevent backflow, then fluid direction control is achieved, but the response time is slow and cannot handle significant pressure heads
Solution Approach 1:
The patent employs dynamic moving walls that can rapidly change position in response to pressure differentials. The check valve mechanism uses a movable wall that automatically shifts to block or allow flow based on real-time pressure conditions, enabling fast response times on the order of microseconds. This dynamic design allows the valve to effectively handle significant pressure heads without slow mechanical actuation.
Solution Approach 2:
The check valve operates autonomously based on pressure differential without external control signals. The movable wall automatically positions itself to prevent backflow when pressure reverses direction, eliminating the need for external actuators or control systems. This self-service mechanism achieves rapid response and reliable backflow prevention through passive pressure-driven operation.
3Volume of moving object
If microfluidic components are miniaturized, then the system size is reduced, but the design and manufacturing difficulty increases
Solution Approach 1:
The patent divides the microfluidic device into distinct functional segments including a pump chamber with moving walls, a check valve section with a movable wall, and fluid channels. Each segment is designed as a separate modular unit that can be independently fabricated using standard microfluidic manufacturing techniques, then assembled into the complete device. This segmentation approach maintains miniaturization while simplifying manufacturing through modular construction.
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 integrated check valves in inertial pumps enable efficient, fast, and controlled fluid flow, preventing backflow and cross-contamination, suitable for applications like DNA testing and fluid mixing, with response times on the order of microseconds.
Implementation Method 1
the fluid actuator can be a resistor configured to generate vapor bubbles to displace fluid in the microfluidic channel
Implementation Method 2
the fluid actuator can be a resistor configured to generate vapor bubbles
Implementation Method 3
Inertial pumps with integrated check valves that utilize a fluid actuator to displace fluid and a moveable valve element with a narrowed channel segment and blocking element to control fluid flow
Data Source
AI summary
The present disclosure is drawn to inertial pumps. An inertial pump can include a microfluidic channel, a fluid actuator located in the microfluidic channel, and a check valve located in the microfluidic channel. The check valve can include a moveable valve element, a narrowed channel segment located upstream of the moveable valve element, and a blocking element formed in the microfluidic channel downstream of the moveable valve element. The narrowed channel segment can have a width less than a width of the moveable valve element so that the moveable valve element can block fluid flow through the check valve when the moveable valve element is positioned in the narrowed channel segment. The blocking element can be configured such that the blocking element constrains the moveable valve element within the check valve while also allowing fluid flow when the moveable valve element is positioned against the blocking element.