Transmissive Micro Bead Barcode Encoding for High Contrast Bioanalysis
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Solution Overview
Problem
Current bioassay technologies face challenges in achieving high contrast and high signal-to-noise detection, particularly in multiplexed bioanalysis of proteins, pathogens, and nucleic acids, due to limitations in microarray technologies such as mechanical printing variations, optical detection efficiency, and barcode recognition speed.
Innovation Solution
The development of digitally encoded micro beads with alternating light transmissive and opaque sections, resembling 1D or 2D bar codes, which are scanned or imaged to decode the code, allowing for high-throughput identification and analysis using a microfluidic apparatus with a sheath flow system for stable bead alignment and optical detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reflective or emissive optical detection is used for barcode beads, then bead identification is possible, but light collection efficiency is poor and barcode contrast is low, especially when micro beads are in the micro flow system
Solution Approach 1:
The patent inverts the traditional reflective/emissive detection approach by using transmissive detection. Instead of detecting light reflected from or emitted by the bead surface, the system detects light transmitted through the bead. This inversion allows the coding pattern to be formed by absorbing sections within the bead that block transmitted light, creating high contrast binary codes with superior signal-to-noise ratio in flow-through configurations.
Solution Approach 2:
The patent applies optical absorption principles where specific sections of the bead are designed to absorb light at particular wavelengths while other sections transmit light. This creates binary coding patterns (0s and 1s) based on light transmission versus absorption, enabling high contrast detection similar to color changes but achieved through optical density variations in the bead material.
2Adaptability or versatility
If fluorescence beads are used for coding, then bead identification is achieved, but the spectral range and possible number of spectrally distinguishable labels limit the potential number of code variations
Solution Approach 1:
The patent uses binary coding patterns (combinations of 0s and 1s) as a simplified copy or representation of complex identification information. Instead of relying on multiple fluorescent spectra, the system encodes vast numbers of unique identifiers using binary sequences transmitted through absorbing patterns, dramatically increasing code capacity while using a single excitation wavelength.
Solution Approach 2:
The patent changes the coding parameter from spectral wavelength (fluorescence emission wavelength) to spatial pattern (binary sequence of absorbing sections). This parameter change allows virtually unlimited code variations by varying the position, width, and combination of binary digits in the transmission pattern, independent of spectral constraints.
3Ease of manufacture
If mechanical contact printing is used for microarray, then DNA can be arrayed on solid support, but printing variations from spot to spot or batch to batch result in inconsistent spot morphology
Solution Approach 1:
The patent replaces the mechanical contact printing system with a flow-through bead system where DNA is immobilized on beads that flow through a detection chamber. This substitution eliminates mechanical printing variability by using standardized bead manufacturing processes and flow-based delivery, ensuring consistent spot morphology through uniform bead production rather than mechanical deposition.
Solution Approach 2:
The patent achieves homogeneity by producing beads with uniform properties through controlled manufacturing processes. Each bead is manufactured with consistent size, shape, and optical properties, and the flow system ensures uniform delivery and detection conditions, eliminating the spot-to-spot and batch-to-batch variations inherent in mechanical printing.
4Area of stationary object
If a small volume of liquid samples is distributed over a relatively large chip surface, then microarray analysis is performed, but insufficient sample amounts or non-uniform distribution over the chip surface cause incomplete reactions or very long reaction time
Solution Approach 1:
The patent transitions from a two-dimensional planar microarray surface to a three-dimensional flow system where beads move through a confined detection chamber. This dimensional change concentrates the sample volume around the beads in the flow path, ensuring sufficient sample-bead interaction without requiring large chip surfaces, and eliminates non-uniform distribution issues through controlled flow dynamics.
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 approach enables high contrast and high signal-to-noise optical detection, facilitating rapid and efficient identification of micro beads in bioanalysis, particularly in multiplexed assays, with improved throughput and accuracy in protein, gene expression, and nucleic acid analysis.
Implementation Method 1
The coded bead comprises a body having a series of alternating light transmissive and opaque sections, with relative positions, widths and spacing resembling a 1D or 2D bar code image
Data Source
AI summary
A micro bead having a digitally coded structure that is partially transmissive and opaque to light. The pattern of transmitted light is determined by to decode the bead. The coded bead may be structured a series of alternating light transmissive and opaque sections, with relative positions, widths and spacing resembling a 1D or 2D bar code image. To decode the image, the alternating transmissive and opaque sections of the body are scanned in analogous fashion to bar code scanning. The coded bead may be coated or immobilized with a capture or probe to effect a desired bioassay. The coded bead may include a paramagnetic material. A bioanalysis system conducts high throughput bioanalysis using the coded bead, including a reaction detection zone and a decoding zone.