Portable Microarray Imaging Detector with Angled Laser and Baffles
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Solution Overview
Problem
Current microarray imaging detectors for fluorescent readout are bulky, expensive, and not suitable for point-of-care (POC) use, limiting their availability and effectiveness in clinical settings.
Innovation Solution
A low-cost, 3D-printed, portable imaging detector that combines a laser assembly, camera, optical filter, and computer processor to image fluorescent microarrays with high sensitivity, enabling handheld, battery-powered operation and integration with telemedicine and mobile computing for protein microarray analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard benchtop fluorescent imaging detectors are used, then imaging sensitivity is adequate, but the devices are bulky, expensive, and not suitable for point-of-care use
Solution Approach 1:
The device segments the optical pathway into distinct functional modules (laser excitation source, sample chamber with microarray, fluorescence detection camera, and signal processing unit), allowing each component to be optimized independently for portability while maintaining overall imaging sensitivity performance
Solution Approach 2:
The system changes operational parameters by using laser excitation at specific wavelengths matched to fluorophore emission characteristics, and by implementing digital signal processing algorithms that enhance weak fluorescent signals from portable-scale samples, achieving benchtop-equivalent sensitivity in a compact form factor
2Ease of operation
If portable imaging devices are created, then point-of-care usability is achieved, but imaging sensitivity and signal-to-noise ratio deteriorate
Solution Approach 1:
The design extracts and removes sources of background noise by implementing optical filtering that isolates fluorescent emission wavelengths from excitation laser light, and by using dark-field sample chamber geometries that eliminate stray light paths, thereby achieving high signal-to-noise ratios in a portable device
Solution Approach 2:
The system introduces intermediary optical components including bandpass filters positioned between the sample and detector, and dichroic mirrors that separate excitation and emission light paths, acting as mediators that protect the sensitive camera detector from overwhelming background noise while allowing weak fluorescent signals to pass through
3Volume of moving object
If compact portable design is implemented, then device size is reduced, but optical pathway alignment and imaging quality become more difficult to maintain
Solution Approach 1:
The design merges multiple optical components (laser diode, excitation optics, sample holder, emission optics, and camera sensor) into a single integrated optical train with shared mechanical housing and alignment references, reducing the number of independent alignment interfaces and thereby maintaining imaging quality in a compact volume
Solution Approach 2:
The optical components are nested within each other in a compact arrangement where the laser excitation pathway is nested through the sample chamber, which is itself nested within the fluorescence detection pathway, allowing all components to share common mechanical references and alignment features while minimizing overall device volume
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 device achieves higher sensitivity than standard benchtop methods, is capable of point-of-care use, and provides rapid concentration calculations, significantly reducing noise and improving assay sensitivity, with a 20-fold reduction in background noise and equivalent limits of detection as high-end scanners.
Implementation Method 1
a laser assembly supported by the housing and oriented at an angle relative to the microarray chip, the laser assembly configured to transmit an excitation beam along a first axis to samples on the microarray chip, a camera supported by the housing and positioned along a second axis, the camera configured to receive fluorescent light emitted from fluorophores in the samples
Implementation Method 2
an optical filter positioned upstream of the lens
Implementation Method 3
a lens received within a second receptacle in the second housing, the lens configured to receive and focus fluorescent light emitted from the microarray chip
Implementation Method 4
The second housing includes a plurality of baffles positioned between the microarray chip and the optical filter
Data Source
AI summary
A microarray chip imaging detector comprises a housing configured to receive a microarray chip. The detector includes a laser assembly supported by the housing and oriented at an angle relative to the microarray chip, the laser assembly configured to transmit an excitation beam along a first axis to samples on the microarray chip. The detector also includes a camera supported by the housing and positioned along a second axis, the camera configured to receive fluorescent light emitted from fluorophores in the samples on the microarray chip, the second axis oriented at an angle less than 30 degrees relative to the first axis. The housing includes a plurality of baffles positioned between the microarray chip and the camera, and a plurality of laser beamstops to receive the excitation beam reflected off the microarray chip.