Microfluidic Analyte Detection via Smartphone Image Texture Analysis
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Solution Overview
Problem
Current methods for detecting analytes in liquid specimens, such as human haemoglobin in stool samples, are cumbersome, require laboratory equipment, and involve sample transfer, which can lead to analyte alteration and prolonged analysis times, making them impractical for on-site, rapid, and reliable testing.
Innovation Solution
A system comprising a micro-fluidic card with a detection chamber containing polymeric beads coated with reagents for agglutination reactions, paired with a smartphone-based optical read-out device for image capture and processing, allowing for on-site, direct, and rapid analysis of analyte concentrations through image texture analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory equipment with optical turbidimetry is used to assay haemoglobin, then measurement precision is improved, but device complexity and loss of time increase due to sample transfer and delayed analysis
Solution Approach 1:
The patent combines the detection chamber, polymeric beads, and optical sensing into a single integrated microfluidic device that can be positioned directly on smartphone cameras. This merging eliminates the need for separate laboratory equipment and sample transfer steps, enabling rapid analysis while maintaining detection capability through the agglutination-based optical detection method
Solution Approach 2:
The patent uses polymeric beads coated with antibodies as an intermediary that enables detection of haemoglobin through agglutination reactions. These beads serve as a mediator between the analyte and the optical detection system, allowing precise measurement through light scattering changes while compatible with simple imaging devices
2Measurement precision
If sample transfer to laboratory is performed, then measurement precision is improved, but loss of time and reliability deteriorate due to prolonged analysis and analyte alteration
Solution Approach 1:
The patent performs the detection action preliminarily by designing a portable system that can be used at the point of care before sample degradation occurs. The detection chamber with pre-coated polymeric beads is prepared in advance, allowing immediate analysis upon sample introduction, thereby preventing analyte alteration that would occur during prolonged storage and transport
Solution Approach 2:
The polymeric beads act as an intermediary that stabilizes the detection process by immediately binding to the analyte upon contact. This intermediary mechanism prevents analyte degradation during the detection process while maintaining measurement precision through the specific antibody-analyte interaction
3Ease of operation
If manual specimen preparation outside the system is performed, then ease of operation is improved, but device complexity increases and productivity decreases
Solution Approach 1:
The patent merges the specimen preparation functions directly into the detection chamber. The microfluidic device integrates sample introduction, reagent mixing, and detection in a single unit, eliminating separate manual preparation steps while maintaining operational simplicity through unified design
Solution Approach 2:
The detection chamber is designed to perform specimen preparation automatically through its own structure. The polymeric beads are pre-loaded and automatically mixed with the specimen through the device's internal fluidic design, eliminating the need for external manual preparation while increasing analysis throughput
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
Enables simple, rapid, and reliable quantitative or semi-quantitative analysis of analytes without the need for extensive hardware or laboratory transfer, facilitating on-site detection of analytes like haemoglobin for colorectal cancer screening and other applications.
Implementation Method 1
detection chamber having a non-zero volume enclosing polymeric beads covered with a reagent suitable for said analyte to be detected, allowing an agglutination reaction in the presence of the analyte
Implementation Method 2
optical read-out device, comprising an image sensor arranged to acquire an image of at least one region of the detection chamber
Data Source
AI summary
The invention relates to a method for detecting an analyte present in a liquid specimen, including: injecting the liquid specimen into a detection chamber, the detection chamber having a non-zero volume enclosing polymeric beads covered with a reagent suitable for the analyte to be detected; capturing at least one image of at least one region of the detection chamber using a sensor; processing the image acquired by the sensor, which includes determining a texture level of the acquired image; and determining a concentration of the analyte depending on the texture level determined for the image.