Microfluidic Cassette Breakable Seal for Reagent Protection
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Solution Overview
Problem
Microfluidic diagnostic devices face challenges in maintaining reagent effectiveness and shelf life due to moisture exposure, especially when using dried reagents, which degrade over time even when the cassette is sealed, leading to reduced test accuracy and storage life.
Innovation Solution
A microfluidic cassette design featuring a sealed reagent chamber with a breakable seal that is exposed to fluid flow only at the time of use, using mechanisms such as piercing force, heat, or light to activate the seal, ensuring reagents remain protected until needed, thereby reducing degradation and simplifying user operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If reagents are deposited directly onto fluid flow channels during cassette manufacturing, then manufacturability is improved, but reagent degradation due to moisture exposure occurs over time
Solution Approach 1:
The cassette is divided into separate functional zones: a sealed reagent storage chamber isolated from the fluid flow channel, and a separate fluid pathway. This segmentation prevents moisture exposure to reagents during storage while allowing easy manufacturing of each component independently.
Solution Approach 2:
The reagent is extracted from the fluid flow channel environment and placed into a separate sealed chamber. This extraction removes the reagent from the harmful moisture-containing atmosphere, preventing degradation while maintaining manufacturing simplicity.
2Reliability
If reagents are sealed in chambers during manufacturing, then reagent protection from moisture is improved, but device complexity increases
Solution Approach 1:
A thin, flexible seal is used to close the reagent chamber during manufacturing. This simple薄膜 structure provides effective moisture protection without adding significant complexity to the cassette design, and can be easily integrated into the manufacturing process.
3Duration of action of stationary object
If dried reagents are used to extend shelf life, then storage duration is improved, but sensitivity to moisture degradation increases
Solution Approach 1:
The reagent chamber is sealed to create a protected environment that excludes moisture. This inert-like atmosphere maintains the dried reagent in a stable state, extending shelf life while preventing moisture-induced degradation that would otherwise occur with hydrophilic reagents.
4Adaptability or versatility
If manual removal of container lids or seals is required before insertion, then user control is improved, but ease of operation deteriorates
Solution Approach 1:
The seal is pre-configured to be automatically broken upon cassette insertion into the device. This preliminary arrangement eliminates the need for manual seal removal, reducing user steps while maintaining the protective function during storage and transport.
Solution Approach 2:
The seal breaking mechanism is designed to activate automatically during the insertion process itself, without requiring separate user action. The system serves itself by using the insertion motion to trigger seal breakdown, thereby simplifying operation while preserving reagent protection.
5Reliability
If additional sealing mechanisms are added to prevent moisture entry, then reagent protection is improved, but device complexity increases
Solution Approach 1:
A simple thin-film seal is used instead of complex multi-component sealing mechanisms. This thin film provides effective moisture protection while adding minimal complexity to the device, and can be easily integrated into the cassette structure.
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 design maintains reagent effectiveness and extends shelf life by isolating reagents from moisture, allows for the use of normally incompatible reagents, and reduces user steps by enabling automatic seal activation, enhancing the reliability and precision of diagnostic tests.
Implementation Method 1
The seal is breakable in situ in the cassette body, for example when a piercing force is applied to the seal
Implementation Method 2
The seal is breakable in situ in the cassette body, for example when a piercing force is applied to the seal, when heat is applied to the seal
Implementation Method 3
The seal is breakable in situ in the cassette body, for example when a piercing force is applied to the seal, when heat is applied to the seal or when light is applied to the seal
Data Source
AI summary
A microfluidic cassette has a microfluidic cassette body having at least one fluid flow channel and at least one chamber containing reagent. The chamber has a seal to prevent fluid from entering the chamber. The seal is breakable in situ in the cassette body. The cassette body and the chamber are configured such that when the seal is broken, the reagent is exposed to fluid flow in the channel.