Deformable Membrane Valve for Microfluidic Channel Sealing
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Solution Overview
Problem
Existing systems for sample extraction and analysis in microfluidic structures face challenges in efficiently sealing and controlling fluidic channels, particularly in using deformable materials to create reliable and closable valve bodies.
Innovation Solution
A cartridge comprising a body made of a malleable material with a layer of deformable material bonded to its surface, sealing fluidic channels and valve bodies. The valve bodies feature a segment with ridges and reliefs, allowing for precise control of fluid flow by deforming the deformable layer against the valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deformable material layer is bonded to seal fluidic channels, then sealing reliability is improved, but the complexity of the valve mechanism increases
Solution Approach 1:
The patent employs a deformable material layer (membrane) bonded to the valve body surface that can be deformed to open or close fluidic channels. This flexible film approach provides reliable sealing while maintaining a relatively simple overall structure, as the membrane's deformation replaces the need for complex moving mechanical components.
Solution Approach 2:
The valve body is segmented into distinct functional zones including ridges, reliefs, and channel segments. The deformable layer is selectively bonded to certain areas (ridges and reliefs) rather than the entire surface, creating localized sealing zones that improve reliability without requiring the entire structure to be complex.
2Manufacturing precision
If ridges and reliefs are formed in the valve body to enable precise fluid control, then flow control precision is improved, but manufacturing complexity increases
Solution Approach 1:
The valve body incorporates curved geometric features including ridges that arch over the channel and reliefs that create depressed sealing zones. These curved structures enable precise control of the deformable layer's deformation pattern, allowing accurate fluid flow control while the features can be integrated into the valve body manufacturing process.
Solution Approach 2:
The valve body features localized geometric modifications (ridges and reliefs) at specific positions rather than uniform structures throughout. The ridges are positioned to guide membrane deformation, while reliefs create specific sealing zones, providing precise flow control through localized structural variations.
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
The solution enables efficient sealing and control of fluidic channels, allowing for precise manipulation of fluids within the cartridge, which is essential for sample extraction, analysis, and biochemical reactions.
Implementation Method 1
a valve body sealed with the layer forms a valve closable by deforming the layer against the valve body
Data Source
AI summary
An instrument includes a fluidic cartridge having a body comprising a malleable material and a layer comprising a deformable material bonded to a surface of the body that seals one or more fluidic channels that communicate with one or more valve bodies formed in a surface of the body. The valve can be closed by applying pressure to the deformable material sufficient to close off a fluidic channel in the body. A cartridge interface is configured to engage the cartridge.