Optical Detection Cell Microfluidic Chip Path Length
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Solution Overview
Problem
Current detection devices and cells face limitations in improving signal-to-noise ratios due to constraints in optimizing path length, volume, and cross-sectional area, which hampers sensitivity, and lack flexibility in sample transfer and preparation, often resulting in sample loss and suboptimal detection.
Innovation Solution
The design of a detection cell with a micro-fluidic chip and multiple layers that allows for adjustable path length and reduced cross-sectional area, enabling improved sensitivity by increasing path length while minimizing sample volume, and incorporating a method for sample transfer that minimizes loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the path length is increased to improve sensitivity, then the signal-to-noise ratio improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The detection cell is divided into multiple discrete layers (first layer, detection cell layer, micro-fluidic chip) that can be manufactured separately and then assembled. This segmentation allows each layer to be optimized independently while achieving the overall function of increased path length without proportionally increasing device complexity.
Solution Approach 2:
The patent transitions from a traditional single-chamber detection cell to a multi-layer stacked configuration. By adding the vertical dimension with multiple layers, the path length is extended without increasing the horizontal footprint, thus improving sensitivity without proportionally increasing overall device complexity.
2Measurement precision
If the sample volume is decreased to improve sensitivity, then the signal-to-noise ratio improves, but the loss of substance during transfer increases
Solution Approach 1:
The micro-fluidic chip is integrated directly with the detection cell layers, merging the sample transfer function with the detection function. This integration eliminates intermediate transfer steps and containers, thereby minimizing sample loss while maintaining the small sample volume needed for high sensitivity.
Solution Approach 2:
The micro-fluidic chip acts as an intermediary component that provides a controlled, low-dead-volume pathway for sample transfer from the fluidic port through the detection channel. This intermediary structure minimizes sample adsorption and spillage compared to traditional open transfer methods.
3Measurement precision
If the cross-sectional area is decreased to improve sensitivity, then the signal-to-noise ratio improves, but the fluid flow control becomes more difficult
Solution Approach 1:
The micro-fluidic chip incorporates fluidic ports and channels designed with appropriate dimensions and geometries to enable controlled fluid flow through the narrow detection channel. By optimizing the fluidic pathway design, the system achieves reliable flow control despite the small cross-sectional area of the detection region.
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 configuration enhances the signal-to-noise ratio, achieving better sensitivity and minimizing sample volume, while allowing for flexible construction and efficient sample handling.
Implementation Method 1
transmitting light at a molecule in a detection channel, and detecting the light reflected or transmitted from the molecule in the detection channel
Implementation Method 2
detecting the light reflected or transmitted from the molecule in the detection channel
Implementation Method 3
applying a compression force to the detection layer and the first layer to attach the detection layer and first layer
Data Source
AI summary
The present invention relates to an optical detection cell for micro-fluidics. The detection cell provides a first layer, a detection cell layer contacting the first layer, a third layer contacting the detection cell layer, a micro-fluidic chip having a fluidic port and a detection channel defined through the detection cell and being in fluid communication with the fluidic port of the chip, the detection channel serving as a light path for receiving light for detecting a molecule. Methods of detecting molecules and making the detection cell are also disclosed.