Multi-Channel Pressure Control for Synchronized Microfluidic Steps
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Solution Overview
Problem
Commercially available pressure controllers for microfluidic devices do not adequately account for the interaction between pressurized channels, leading to inconsistent and inefficient pressure control, particularly in multi-channel systems where channels of different magnitudes require synchronized pressure changes.
Innovation Solution
A multi-channel pressure controller system that uses an algorithm to slow down faster pressure steps to match the rate of slower steps, employing step partitioning methods and proportional-integral-differential (PID) feedback to ensure that all channels reach their target pressures simultaneously, utilizing independently controlled pressure channels with proportional and vent valves, and sensors for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure steps of different magnitudes are applied to multiple channels simultaneously, then pressure control precision is improved, but channels reach target pressures at different times causing synchronization issues
Solution Approach 1:
The pressure control system segments the pressure adjustment process into multiple discrete steps. Each channel's pressure change is divided into controllable steps, allowing the system to manage and coordinate pressure changes across multiple channels with different magnitude requirements while maintaining synchronization.
Solution Approach 2:
The system performs preliminary calculations to determine the number of steps and time duration for each channel's pressure adjustment before execution. By pre-calculating these parameters based on target pressures and channel characteristics, the system ensures all channels reach their targets simultaneously without waiting for sequential settling.
2Productivity
If pressure changes are applied rapidly to multiple channels, then productivity is improved, but pressure control stability deteriorates
Solution Approach 1:
The system dynamically adjusts pressure control parameters for each channel based on real-time feedback and pre-calculated step plans. By making the control process adaptive and dynamic rather than static, the system achieves rapid pressure changes while maintaining stability through continuous monitoring and adjustment.
Solution Approach 2:
The pressure control system incorporates feedback mechanisms that monitor actual pressure values in each channel and compare them against target values. This feedback enables the system to make real-time corrections, ensuring stable and accurate pressure control even during rapid changes across multiple channels.
3Measurement precision
If sequential pressure settling is used for each channel, then pressure control accuracy is improved, but time consumption increases
Solution Approach 1:
Instead of sequential settling, the system segments pressure control into simultaneous multi-channel operations. Each channel receives its own segmented pressure steps calculated to reach the target at the same time, eliminating the need for sequential waiting while maintaining accuracy through individualized step planning.
Solution Approach 2:
The system performs preliminary calculations for all channels before execution, determining the exact number of steps and time duration each channel needs. This pre-planning enables all channels to be adjusted simultaneously with accurate timing, eliminating sequential settling delays while preserving control accuracy.
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 system enables precise and rapid pressure control across multiple channels, reducing the need for sequential settling and allowing for more efficient and synchronized pressure changes, enhancing the performance of microfluidic devices by ensuring that all channels reach their setpoints in close temporal proximity.
Implementation Method 1
a proportional valve configured to modulate a pressure of a fluid in the channel
Implementation Method 2
a discrete valve fluidically connected to the channel and configured to switch between fluidly connecting the channel to atmosphere and fluidly disconnecting the channel from atmosphere
Implementation Method 3
a pressure sensor configured to detect a pressure of a fluid in the channel
Implementation Method 4
an inlet receiving pressurized fluid from a pump
Data Source
AI summary
Pressure control systems and methods are provided that aid in the control of fluidic or pneumatic devices, by improving the ability to control pressure independently and simultaneously on multiple channels, which in turn permits pressure changes on the channels to occur more quickly and more precisely. In order to match rise/fall times between steps on different channels that may be of different magnitudes, various embodiments slow down fast steps such that they match the “default” rate of slower steps, such as by using a step partitioning method or breaking a single step into substeps with a pause inserted between substeps of necessary duration such that the complete step time matches the target step time. The provided systems and methods may utilize a combination of proportional-integral-derivative (PID) control loop and discrete pressure steps to achieve faster, more accurate control over pressure rises and pressure falls.