LED Thermal Contrast Assay Reader for Sensitive LFA Detection
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Solution Overview
Problem
Existing lateral flow assays (LFAs) face limitations in sensitivity due to the use of high-intensity light sources like lasers, which are costly and difficult to implement with LEDs, leading to inefficient light collection and reduced intensity at the sample, limiting their effectiveness in detecting low levels of antigens.
Innovation Solution
The use of high-power LEDs in conjunction with optical assemblies and fiber optics to illuminate larger areas of the LFA, allowing for spatial and temporal control of light patterns to enhance thermal contrast detection, thereby improving sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-intensity light sources like lasers are used, then detection sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex laser sources with inexpensive, simple LEDs that can be easily replaced. The LEDs provide sufficient illumination for thermal contrast detection without the complexity and cost of laser systems, while maintaining adequate detection sensitivity through proper optical design and thermal imaging.
Solution Approach 2:
The patent substitutes mechanical/optical alignment systems required for lasers with a more robust LED-based system that is less sensitive to alignment issues. The LED source combined with diffuse reflector and optical lens creates a tolerance-friendly system that maintains detection sensitivity without complex adjustment mechanisms.
2Measurement precision
If high-intensity light sources like lasers are used, then detection sensitivity is improved, but cost increases
Solution Approach 1:
The patent employs inexpensive LEDs instead of costly laser sources, significantly reducing manufacturing costs. The LED assembly with diffuse reflector and optical lens provides a cost-effective solution that achieves adequate detection sensitivity for thermal contrast imaging without the high expenses associated with laser systems.
3Device complexity
If LED light sources are used, then device complexity is reduced, but light intensity at the sample decreases
Solution Approach 1:
The patent introduces a diffuse reflector as an intermediary between the LED source and the sample. This reflector redirects and distributes LED light onto the sample surface, compensating for the lower intrinsic intensity of LEDs compared to lasers while maintaining system simplicity. The optical lens further mediates light delivery to ensure sufficient illumination at the sample.
Solution Approach 2:
The patent transitions from direct illumination geometry to a distributed illumination approach using the diffuse reflector. By redirecting light through multiple paths and angles, the system achieves adequate light intensity at the sample surface without requiring high-power LEDs, thus maintaining device simplicity.
4Device complexity
If LED light sources are used, then device complexity is reduced, but detection sensitivity worsens
Solution Approach 1:
The patent employs a thermal imaging camera as a sensitive intermediary detector that can accurately measure the thermal contrast generated by the LED-illuminated sample. This detector compensates for the lower light intensity from LEDs, maintaining detection sensitivity in the nM to pM range despite the simpler LED-based illumination system.
Solution Approach 2:
The patent measures thermal parameters (temperature changes) rather than direct optical parameters. By detecting the thermal contrast signal generated when LED light is absorbed by the sample, the system achieves high detection sensitivity with simple LED sources, as thermal measurements are inherently more sensitive to small changes than direct optical measurements.
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 more accurate and sensitive detection of antigens by maintaining sufficient light intensity at the sample, overcoming the limitations of previous light sources and enhancing the analytical sensitivity of LFAs to the nM to pM range.
Implementation Method 1
a light emitting diode (LED) source element
Implementation Method 2
The sensor is an infrared sensor configured to measure thermal contrast in the test region of the sample
Implementation Method 3
with an angled window to separate visual and infrared light paths
Implementation Method 4
The optical assembly may include fiber optic cables configured to couple light from the LED source element to a sample
Data Source
AI summary
A thermal contrast assay reader (200) includes a light emitting diode (LED) source element (202), a sensor (208), and I/O circuitry and an opening to receive a sample (206). The reader (200) is configured to convert the sensor results to an output signal representative of light incident onto a test region (214) of the sample (206). The sensor (208) is an infrared sensor configured to measure thermal contrast in the test region (214) of the sample (206).