Microsystem Fluidic Applications Elastic Membrane Reservoir
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Solution Overview
Problem
Existing microfluidic systems face challenges in accurately and hygienically delivering reagent liquids, as they rely on external instruments prone to errors, contamination, and sterility issues, with storage of liquids in external containers leading to inaccuracies and contamination risks.
Innovation Solution
A multi-layered microsystem design featuring a stiff substrate and an elastic membrane with a recess for reagents, where the membrane deflects to create pressure for drainage, eliminating the need for external containers and ensuring precise, controlled delivery of reagents directly within the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reagent liquids are stored in external containers and delivered via syringe pumps or pipetting, then the microfluidic system can be supplied with reagents, but contamination risks and sterility issues increase
Solution Approach 1:
The invention merges the reagent storage function directly into the microfluidic chip by integrating reservoirs within the chip structure itself, eliminating the need for external containers and tubing connections. This integration removes potential contamination interfaces and maintains sterility throughout the reagent delivery process.
Solution Approach 2:
The invention extracts the reagent storage function from external instruments (syringe pumps, pipettes) and relocates it directly into the microfluidic system through integrated reservoirs, thereby eliminating the harmful contamination pathways associated with external delivery mechanisms.
2Measurement precision
If reagent liquids are stored in external containers connected via tubing, then the system can deliver reagents, but metering accuracy decreases due to user and equipment errors
Solution Approach 1:
The microfluidic system performs self-metering through precisely engineered microchannels and integrated reservoirs that control reagent delivery automatically. The system eliminates user-dependent operations by using fabrication-defined geometries to control flow rates and volumes, ensuring consistent metering accuracy without manual intervention.
Solution Approach 2:
The invention replaces manual mechanical delivery systems (syringe pumps, pipettes) with integrated microfluidic structures where geometry and pressure differentials control reagent flow. This substitution eliminates user error and equipment variability associated with manual metering instruments.
3Quantity of substance
If large amounts of liquid are stored in external containers, then the system has sufficient reagent supply, but dead volumes increase and contamination risk rises
Solution Approach 1:
The invention transitions from three-dimensional external container storage to two-dimensional planar integration within the chip substrate. By etching reservoirs and channels directly into the chip plane, the system minimizes dead volumes while maintaining sufficient reagent capacity through optimized surface-area-to-volume ratios inherent to microfabricated structures.
Solution Approach 2:
The invention segments the reagent storage into multiple small integrated reservoirs within the chip rather than using a single large external container. This segmentation reduces dead volumes in connecting tubing and interfaces while providing adequate total reagent volume through distributed storage locations positioned close to their points of use.
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 minimizes contamination, improves metering accuracy, enhances user safety, reduces manual handling, and allows for precise volume control, reducing errors and sterility issues associated with external liquid storage.
Implementation Method 1
an elastic, moveable membrane or film... The deflection of the membrane into the recess displaces the liquid in the direction of the drainage channel
Implementation Method 2
The predetermined breaking point is embodied such that it breaks if a critical pressure is exceeded
Implementation Method 3
by means of film welding by using specific welding parameters... the described production method with polymer materials and laser welding
Data Source
AI summary
A microsystem for fluidic applications includes a substrate with a reservoir, a first microchannel, connected to the reservoir, and a second microchannel, separated from the first microchannel by a fixed member. The microsystem furthermore has an elastic film on the substrate, which film has a joint to the substrate around the reservoir and seals the reservoir. Here, the joint has a permanent joining area and, on the fixed member, a fixed member joining area that can be broken open and adjoins the permanent joining area at both ends of the fixed member. Such a microsystem forms a processing chip with reagent receptacle.