Manual Plunger Microfluidic Device for Nucleic Acid Testing
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Solution Overview
Problem
Current micro/mesofluidic test devices require electrical power systems to drive and regulate pressure for moving fluids, which is complex and power-intensive, especially for Nucleic Acid Tests like DNA and RNA tests.
Innovation Solution
A manually operated test sample device uses a compressible fluid system with a plunger and air to create positive air pressure, eliminating the need for electrical systems by using a plunger with an O-ring to force fluids through channels to a test area, facilitating human activation and controlled pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electrical power systems are used to drive and regulate pressure in micro/mesofluidic test devices, then fluid routing and pressure control can be automated and precisely regulated, but the device complexity and power requirements increase significantly
Solution Approach 1:
The patent extracts and removes the electrical power system from the microfluidic test device, replacing it with a manual plunger mechanism. This eliminates motors, drive electronics, and power management systems while retaining the core fluid routing functionality through purely mechanical means.
Solution Approach 2:
The device uses the user's own manual action (pushing the plunger) to generate the driving force for fluid movement. The compressible fluid system converts this manual input into controlled pressure and flow, making the system self-sufficient without external electrical power sources.
2Manufacturing precision
If electrical power systems are used to drive and regulate pressure in micro/mesofluidic test devices, then fluid routing can be precisely controlled, but the power requirements become high and unsustainable for portable applications
Solution Approach 1:
The patent employs a compressible fluid (pneumatic) system where a plunger compresses air or gas to generate pressure for driving test fluids through the microfluidic channels. This pneumatic approach replaces electrical pressure regulators and motors, achieving pressure control without continuous power consumption.
Solution Approach 2:
The manual plunger operation provides periodic, discrete pressure pulses to drive fluid through the device. Each plunger stroke delivers a controlled volume of fluid, creating a rhythmic flow pattern that replaces continuous electrical pumping while reducing overall energy requirements.
3Measurement precision
If motors and drive electronics are used to route reagents and test samples, then fluid routing accuracy is improved, but the tooling complexity and cost increase
Solution Approach 1:
The device is segmented into discrete functional zones (reagent reservoirs, mixing chambers, test areas) connected by microfluidic channels. The manual plunger system segments fluid delivery into controlled portions, routing reagents and samples through defined paths without requiring complex motorized positioning systems.
Solution Approach 2:
The compressible fluid (air/gas) acts as an intermediary between the manual plunger input and the test fluids. This intermediate medium transmits the mechanical force from the plunger to the liquids in a controlled manner, enabling precise fluid routing through soft or rigid microfluidic channels without direct mechanical contact or motors.
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 solution allows for efficient and consistent fluid routing without electrical power, reducing the complexity and power requirements, while ensuring accurate and controlled delivery of test mixtures to the test area, suitable for Nucleic Acid Tests.
Implementation Method 1
uses an efficient compressible fluid system (plunger and a compressible fluid (e.g., air)) to provide a controlled and consistent pressurized driving force
Implementation Method 2
creates a positive air pressure to force a fluid through the test sample device
Data Source
AI summary
A sample test device is provided that includes a body having an insertion surface spaced apart from a distal end portion and a fluid manipulating assembly disposed in the distal end portion. A mixing receptacle is defined in the fluid manipulating assembly and provides a volume to mix a test mixture. A plunger is disposed in the body and creates a positive air pressure in the mixing receptacle when inserted into the body. A test die is disposed in the fluid manipulation assembly and a fluid path extends from the mixing receptacle to the test die. Activation of the plunger creates a positive pressure in the mixing receptacle to force the test mixture to flow from the mixing receptacle to the test die.