Analyte Sensor with Air Gaps for Point-of-Care Diagnostics
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Solution Overview
Problem
Current point-of-care diagnostics for analyte detection are often complex, require specialized equipment and trained personnel, and suffer from reliability issues, limiting their widespread use in detecting trace amounts of analytes such as protein biomarkers, drugs, or toxins.
Innovation Solution
A sensor device with surficial walls and a binding material that undergoes a change in surface energy upon analyte binding, allowing for easy detection in a fluid sample, utilizing air gaps and binding agents like molecularly-imprinted polymers or aptamers to differentiate between samples with and without the analyte of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current point-of-care diagnostic techniques (ELISA, LFA, RT-PCR) are used for analyte detection, then detection capability is achieved, but device complexity and requirement for specialized equipment increase
Solution Approach 1:
The patent extracts the core detection function from complex laboratory equipment and implements it in a simplified sensor format. The sensor contains only essential components: a structure with surficial walls, binding material for analyte capture, and air gaps for optical detection. This eliminates the need for PCR amplification equipment, complex immunoassay reagents, and specialized readers, achieving trace analyte detection with a minimal device.
Solution Approach 2:
The patent creates a simplified optical detection system that copies the essential measurement principle from complex diagnostics. Instead of using expensive electrical readers and complex signal processing, the invention uses a straightforward optical system where light passes through air gaps and detects refractive index changes caused by analyte binding, providing a visual or simple optical readout that replicates detection capability without the complexity.
2Measurement precision
If current point-of-care diagnostic techniques are used, then analyte detection is performed, but reliability decreases due to known issues with LFAs and complexity requirements
Solution Approach 1:
The patent uses air gaps within the sensor structure as a porous-like medium for optical detection. These air gaps create a controlled environment where light transmission is sensitive to analyte presence but insensitive to many sources of variability that plague LFAs. The air gaps provide a stable, reproducible optical path that enhances reliability by reducing sensitivity to environmental factors, sample matrix effects, and operational variations.
Solution Approach 2:
The patent detects analytes by measuring changes in refractive index parameters within the air gaps. When analyte binds to the binding material, it changes the local refractive index, which alters light transmission through the air gaps. This physical parameter change provides a reliable, quantitative signal that is less susceptible to the reliability issues affecting antibody-based LFAs, such as antibody degradation, non-specific binding, and lot-to-lot variability.
3Measurement precision
If complex diagnostic techniques are used, then detection sensitivity is achieved, but ease of operation decreases due to need for trained personnel
Solution Approach 1:
The sensor is designed to be self-contained and self-explanatory. The binding material automatically captures analytes from the sample, and the air gaps automatically transduce this binding into an optical signal. No trained personnel are needed to perform complex sample preparation, reagent addition, or instrument operation. The user simply applies the sample and observes the optical change, making the system as easy to operate as a standard test strip while achieving trace detection sensitivity.
4Productivity
If rapid detection is implemented, then productivity increases, but measurement precision may worsen without proper equipment
Solution Approach 1:
The sensor structure is pre-configured with binding material and air gaps during manufacturing, eliminating the need for complex sample preparation or equipment setup at the time of use. The binding material is pre-positioned to optimize analyte capture, and the air gaps are pre-formed to provide optimal optical pathways. This preliminary preparation allows rapid sample application and immediate detection, achieving both speed and precision without requiring lengthy procedures or complex equipment calibration.
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 rapid, reliable, and user-friendly detection of analytes in low concentrations without the need for expensive equipment or highly trained technicians, suitable for various industries including healthcare and environmental monitoring.
Implementation Method 1
when the analyte of interest binds to the binding material, a change in surface energy results within the surficial walls
Implementation Method 2
the surficial walls of the structure define a plurality of air gaps in the structure
Data Source
AI summary
A sensor for detecting an analyte of interest in a fluid sample includes (i) a structure having a plurality of surficial walls that define a plurality of air gaps in the structure and (ii) a binding material. The structure is configured such that both a fluid sample lacking the analyte of interest and a fluid sample containing the analyte of interest are able to penetrate the plurality of air gaps. The binding material, which is present on the plurality of surficial walls, is able to bind the analyte of interest. The sensor is configured such that, when the analyte of interest binds to the binding material, a change in surface energy results within the plurality of surficial walls.