Microfluidic Pressure Control via Coupled Valve Actuation
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Solution Overview
Problem
Existing microfluidic channel systems face challenges with high gas consumption and poor response behavior in controlling pressure changes due to the limitations of traditional pressure divider systems with serially connected valves.
Innovation Solution
A method and device utilizing a first and at least one second valve, where the activation of one valve is automatically dependent on the activation of another, allowing for optimal control of pressure dynamics and flow by adjusting the valve opening degrees, with the valves connected in series to form a pressure divider system, and using proportional valves controlled by electrical or pneumatic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional pressure divider systems with serially connected valves are used, then pressure control is achieved, but gas consumption is high and response behavior is poor
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the actual pressure in the microfluidic channel and automatically adjusts the valve openings to maintain the desired pressure. This closed-loop control optimizes gas consumption by only opening valves when pressure deviations occur, rather than continuous operation, and improves response behavior through real-time adjustments based on actual pressure measurements
Solution Approach 2:
The system uses automatic pressure regulation where the control unit independently manages the valve openings based on pressure sensor feedback. The system self-adjusts without manual intervention, optimizing the balance between gas consumption and response time by automatically determining when and how much to open each valve based on current pressure conditions
2Reliability
If valve opening degrees are adjusted for optimal pressure control, then pressure dynamics are improved, but system complexity increases
Solution Approach 1:
The patent introduces a control unit as an intermediary between the pressure sensor and the valves. This control unit simplifies the overall system architecture by centralizing the decision-making logic for valve actuation. The control unit receives pressure data, processes it according to control algorithms, and generates appropriate valve control signals, thereby managing complexity rather than increasing it despite achieving precise pressure control
3Speed
If automatic valve activation is implemented, then response dynamics are improved, but control system complexity increases
Solution Approach 1:
The automatic valve activation is driven by feedback from pressure sensors that continuously monitor the actual pressure. When pressure deviations are detected, the control unit automatically actuates the appropriate valves to correct the pressure. This feedback-based automatic activation achieves fast response dynamics by immediately responding to pressure changes without manual intervention, while the control unit manages the complexity of coordination between multiple valves and sensors
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 enables precise and efficient control of pressure in microfluidic channels with reduced gas consumption, improved response dynamics, and minimal control noise, allowing for reproducible movement and positioning of objects like cells or molecules.
Implementation Method 1
A pressure source (e.g. compressed air) can be connected or connected to the first valve, and a pressure sink (e.g. atmospheric pressure or a vacuum or a vacuum pump) to the second valve
Implementation Method 2
The fluid in the microchannel preferably moves as, preferably exclusively, laminar flow
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The method involves actuating a valve (10) for adjustment of a valve opening degree, and actuating a second valve (20) for adjustment of second valve opening degree. The actuation of one the valves is automatically carried out based on actuation of the other valve. A counter-coupling of driving parts of the valves is enabled, and a sum of flow resistances of the valves is kept constant. A preferably uninterrupted course of pressure in a micro-or meso fluidic channel (2) is set with positive and negative pressure values. An independent claim is also included for a device for controlling pressure in a micro- or a meso fluidic channel using a valve.