Hermetically Sealed Microfluidic Chip With Laser-Bonded Release Zones
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Solution Overview
Problem
Current methods for storing and managing materials on microfluidic chips, such as fluids and sensitive electronics, face challenges with chemical incompatibility, poor hermeticity, and operational inconvenience due to the use of polymers and adhesives, and lack controlled release mechanisms.
Innovation Solution
The method employs room temperature laser bonding to create hermetically sealed chambers within microfluidic chips, allowing for controlled opening and release of encapsulated materials using mechanical or thermal techniques, avoiding the use of polymers and adhesives, and enabling independent access to multiple chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymers and adhesives are used to create hermetic seals in blister packs, then the sealing process is simple and integrated with microfabrication, but the hermeticity is poor and chemical incompatibility issues arise
Solution Approach 1:
The patent changes the bonding parameters from room temperature adhesive bonding to elevated temperature laser bonding. The laser bonding process operates at temperatures between 200-500°C, which creates a hermetic seal through direct material fusion rather than adhesive bonding. This parameter change resolves the contradiction by achieving both ease of manufacture (through direct bonding without separate adhesive steps) and reliability (through hermetic sealing at elevated temperatures).
Solution Approach 2:
The patent replaces the mechanical/adhesive bonding system with a thermal/laser bonding system. Instead of using adhesives that require clamping and curing, the invention uses laser energy to directly bond the substrate materials together through localized melting and fusion. This substitution eliminates the hermeticity problems associated with adhesive bonding while maintaining manufacturing simplicity.
2Adaptability or versatility
If external reservoirs with connecting assemblies are used, then fluid delivery is flexible, but the device footprint is large and operational convenience is reduced
Solution Approach 1:
The patent implements nesting by placing the reservoir chamber directly within or integrated into the chip substrate structure. The reservoir is formed as an internal cavity within the chip itself, eliminating the need for external reservoirs and connecting assemblies. This nested configuration reduces the device footprint while maintaining fluid delivery flexibility through on-chip fluidic pathways.
Solution Approach 2:
The patent merges the reservoir function with the chip substrate by forming the reservoir as an integral part of the chip structure. The substrate serves dual purposes as both the structural platform and the fluid containment vessel. This merging eliminates separate external components and reducing assemblies, thereby reducing the overall device footprint while preserving fluid delivery adaptability.
3Reliability
If hermetic seals are made permanent through strong bonding, then sealing reliability is high, but controlled release and opening become difficult
Solution Approach 1:
The patent segments the hermetic seal into two distinct functional zones: a strong bonding zone for hermetic sealing and a weakened release zone for controlled opening. The laser bonding process creates a primary bond interface with high strength for reliability, while incorporating a secondary weakened interface or release feature that allows controlled separation when needed. This segmentation resolves the contradiction by providing both strong sealing and easy release capabilities.
Solution Approach 2:
The patent introduces dynamic characteristics to the hermetic seal by designing it to transition from a permanent-sealing state to a controlled-release state. The seal structure includes features such as score lines, pre-formed fracture planes, or stress-concentration zones that remain stable during operation but can be activated to release the seal when required. This dynamic design allows the seal to adapt between providing reliable containment and enabling controlled access.
Data Source
AI summary
Embodiments generally relate to chips containing one or more hermetically sealed chambers that may be dismantled under controlled conditions using a release technique. In one embodiment a chip comprises a first hermetic seal bonding first and second elements to create a first chamber and a second hermetic seal bonding third and fourth elements to create a second chamber encompassing the first chamber. The first hermetic seal may be broken open independently of the second hermetic seal by the application of a mechanical or thermal technique.