Passive Fluidics Circuit for Sequential Reagent Delivery
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Solution Overview
Problem
Current fluidics systems for regulating multiple fluid flows suffer from issues such as large surface areas that adsorb or retain reagents, physical size limitations for miniaturization, and the use of moving parts leading to wear and increased costs, making them inefficient for complex synthetic or analytical processes.
Innovation Solution
A passive fluidics circuit that controls multiple fluid flows to a common volume without intermixing or cross-contamination using a node and interconnected passages with controlled flow resistances and waste ports, eliminating the need for moving parts and allowing miniaturization for use in microfluidics applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional fluidics systems with moving parts are used to regulate multiple fluid flows, then fluid switching capability is achieved, but device complexity and manufacturing costs increase due to moving parts wear and assembly requirements
Solution Approach 1:
The patent replaces mechanical moving parts with a passive fluidic circuit design that uses fluid pressure differentials and flow resistances to control fluid routing. The system employs a fluidics node with multiple inlets and outlets where fluid flow is directed based on pressure gradients rather than mechanical valves, eliminating wear and complexity associated with moving parts.
Solution Approach 2:
The fluidic circuit operates autonomously using the inherent properties of fluid flow and pressure differentials to direct fluids through the appropriate pathways. The system self-regulates fluid routing based on the configuration of flow resistances and pressure sources without requiring external mechanical control mechanisms.
2Ease of operation
If large surface area components are used in fluidics systems, then fluid flow regulation is achieved, but reagent adsorption and retention increase, reducing efficiency
Solution Approach 1:
The patent transitions from traditional large-surface-area fluidic components to a miniaturized three-dimensional integrated circuit architecture. By stacking multiple fluidic layers vertically and using through-substrate vias for interlayer connections, the system achieves complex fluid routing in a compact volume, minimizing the surface area available for reagent adsorption while maintaining full fluid flow regulation capability.
3Volume of moving object
If miniaturized fluidics components are used, then device size is reduced, but complete purging and removal of successive reagents becomes difficult due to less accessible surfaces
Solution Approach 1:
The fluidic circuit is segmented into distinct functional modules including separate reagent delivery pathways, wash channels, and waste ports. Each module can be independently purged through dedicated access points, allowing complete removal of reagents from miniaturized components without requiring disassembly. The segmented design provides multiple access points for thorough cleaning of internal surfaces.
4Adaptability or versatility
If sequential reagent delivery is implemented in a common volume, then multi-step processes are achieved, but intermixing or cross-contamination of fluids occurs
Solution Approach 1:
The patent implements spatially differentiated fluid pathways within the integrated circuit, where each reagent has its own dedicated channel leading to the reaction chamber. The fluidics node provides localized control points with adjustable flow resistances that can be independently tuned for each reagent stream, ensuring precise control over fluid delivery timing and preventing cross-contamination while enabling sequential multi-step processes.
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
Enables efficient, miniaturized fluid switching with no intermixing, suitable for complex processes like electrochemical reactions, by directing selected fluid flows through laminar paths and diverting unselected flows to waste ports, maintaining a stable reference potential and reducing manufacturing costs.
Implementation Method 1
the fluid resistances of the passages being selected so that whenever a fluid flows solely through a single fluid inlet to form a flow in the fluidics node a portion of such fluid exits the fluidics node through the outlet and the remainder of such fluid exits the fluidics node through the one or more passages
Implementation Method 2
In one aspect, the selected fluidic inlet provides a laminar flow of fluid through the fluidics node
Implementation Method 3
Free diffusion or leakage of fluids from unselected inlets into the common outlet or other inlets at junctions or nodes is prevented by the flow of the selected inlet fluid, a portion of which sweeps by the inlets of unselected fluids
Data Source
AI summary
The invention provides a passive fluidics circuit for directing different fluids to a common volume, such as a reaction chamber or flow cell, without intermixing or cross contamination. The direction and rate of flow through junctions, nodes and passages of the fluidics circuit are controlled by the states of upstream valves (e.g. opened or closed), differential fluid pressures at circuit inlets or upstream reservoirs, flow path resistances, and the like. Free diffusion or leakage of fluids from unselected inlets into the common outlet or other inlets at junctions or nodes is prevented by the flow of the selected inlet fluid, a portion of which sweeps by the inlets of unselected fluids and exits the fluidics circuit by waste ports, thereby creating a barrier against undesired intermixing with the outlet flow through leakage or diffusion.