Linear Displacement Pump for Nano-Scale Fluid Flow Control
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Solution Overview
Problem
Current microfluidic systems face challenges in achieving precise, non-pulsatile, and continuous fluid flow at nano-scale rates due to limitations in pump technology and thermal control, which affects the accuracy of biochemical assays and data acquisition.
Innovation Solution
A linear displacement pump using a servo motor drive and lead screw mechanism, coupled with a thermally conductive body for precise temperature regulation, enables low, non-pulsatile liquid flow rates from 0 to 500 nl/min with a precision of 0.1 nl/min, and a microfluidic interconnect design minimizes thermal noise and fluid dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microfluidic pumping methods are used, then device simplicity is maintained, but flow rate precision and thermal control are insufficient for nano-scale rates
Solution Approach 1:
The pump mechanism is segmented into modular components: a linear motor for precise positional control, a lead screw for motion conversion, and a plunger for fluid displacement. This segmentation allows each component to be optimized independently, achieving nano-scale flow rate precision (0.1 nl/min) while maintaining manageable device complexity through functional modularity.
Solution Approach 2:
A thermally conductive body is introduced as an intermediary between the pump mechanism and the fluid environment. This intermediary component provides precise thermal control to compensate for temperature-induced volume changes, enabling stable nano-scale flow rates by decoupling thermal effects from mechanical pumping action.
2Productivity
If discrete dilution steps are used, then assay throughput is limited, but continuous gradient generation requires precise flow control at nano-scale rates
Solution Approach 1:
The pump system transitions from static, discrete dilution steps to dynamic, continuous flow rate adjustment. The linear motor with servo control enables real-time modification of plunger position and flow rate, allowing continuous concentration gradients to be generated. This dynamic control achieves both high assay throughput and precise flow rate control (0.1 nl/min resolution) by eliminating the need for multiple discrete preparation steps.
3Object-affected harmful factors
If thermal control is not implemented, then device simplicity is maintained, but thermal noise and fluid dispersion increase at nano-scale flow rates
Solution Approach 1:
A thermally conductive body serves as a thermal intermediary between the pump mechanism and the fluid. This component actively regulates temperature to compensate for thermal expansion and contraction effects, reducing thermal noise and fluid dispersion. The thermal control system is integrated into the pump structure, adding minimal complexity while effectively suppressing thermal disturbances at nano-scale flow rates.
Solution Approach 2:
The thermal control system implements feedback mechanisms to monitor and adjust temperature in real-time. By continuously compensating for thermal effects on fluid volume and pump component dimensions, the system maintains stable flow rates and minimizes dispersion. This feedback-based thermal management reduces harmful thermal noise without requiring overly complex external control systems.
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 solution allows for precise control of fluid flow and temperature, reducing noise and improving data quality in microfluidic assays, enabling efficient handling of fluids at nano-scale rates and enhancing the reliability of biochemical measurements.
Implementation Method 1
A linear displacement pump using a servo motor drive and lead screw mechanism
Implementation Method 2
coupled with a thermally conductive body for precise temperature regulation
Data Source
AI summary
Apparatus and Method for Handling Fluids at Nano-Scale Rates. A linear displacement pump produces non-pulsatile liquid flow rates as low as the nl/mm range. The pump includes a servo motor, a gear reduction, a lead screw, a linear stage, a barrel, and a plunger extending into the barrel and coupled to the stage. A microfluidic interconnect device can be coupled to the barrel. One or more of these pumps can be disposed in a thermally controlled pump assembly that includes a pump housing, a thermally conductive body disposed in the housing and including first and second opposing sides, and a temperature regulating element such as a thermoelectric device disposed in thermal contact with the thermally conductive body on a side thereof opposite to the barrel or barrels of the pumps.