Microfluidic Flow Meter With Movable Element
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Solution Overview
Problem
Existing microfluidic flow meters are sensitive to fluid properties, leading to inaccurate readings, especially at the microfluidic scale, and invasive methods like particle image velocimetry or magnetic fields can interfere with fluid operations.
Innovation Solution
A device using a movable element retained within a microfluidic channel, where the element's movement is measured to determine fluid flow, and a microfluidic pump returns the element to its starting position for repeated calibrations, minimizing interference with fluid properties and operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing microfluidic flow meters are used to measure fluid flow rates, then flow rate measurement is achieved, but the measurements are sensitive to fluid properties leading to inaccurate readings
Solution Approach 1:
The patent replaces thermal or electromagnetic flow measurement systems with a mechanical measurement system using a movable element (such as a bead or particle) whose physical displacement through the microfluidic channel is tracked. This mechanical approach is less sensitive to fluid properties like viscosity, temperature, and conductivity compared to thermal or electromagnetic methods, thereby improving measurement accuracy while reducing sensitivity to harmful fluid property variations.
2Measurement precision
If invasive methods like particle image velocimetry or magnetic fields are used to measure flow, then flow rate can be determined, but the methods interfere with fluid operations
Solution Approach 1:
The patent extracts the measurement function from invasive external fields or particle injection methods and implements it through a passive movable element that is already present in the microfluidic channel. The element's natural displacement due to fluid flow is measured without requiring external magnetic fields, light sheets, or particle injection, thereby eliminating interference with fluid operations while maintaining measurement precision.
3Measurement precision
If a movable element is used to measure flow rate, then measurements are less sensitive to fluid characteristics, but the element requires return mechanisms for repeated calibrations
Solution Approach 1:
The patent implements a self-service return mechanism where the movable element automatically returns to its starting position using the same fluid flow that drives it forward during measurement. By reversing the flow direction through the microfluidic channel, the element is naturally carried back without requiring external actuators, motors, or complex mechanical return systems, thereby reducing device complexity while maintaining measurement precision.
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 provides precise flow rate measurements that are less sensitive to fluid characteristics, allowing for accurate calibration of other flow meters and reducing interference, thereby enhancing the operation of microfluidic systems.
Implementation Method 1
a movable element retained within a microfluidic channel to move from a first position to a second position by fluid flow through the microfluidic channel
Implementation Method 2
a microfluidic pump to return the movable element from the second position to the first position
Data Source
AI summary
An example device includes a microfluidic channel and a movable element retained in the microfluidic channel to move from a first position to a second position by fluid flow through the microfluidic channel. The device includes a sensor to take a sensor reading to determine fluid flow through the microfluidic channel. The device includes a microfluidic pump to return the movable element from the second position to the first position. The device includes a controller to actuate the microfluidic pump and to determine a flow rate of the fluid flow through the microfluidic channel based on the sensor reading.