Nanomechanical Sensor for Rapid SARS-CoV-2 Antigen Detection
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Solution Overview
Problem
Current COVID-19 diagnostic methods, such as RT-PCR and immunoassays, face challenges with long turnaround times, high false positive/negative rates, and limited accessibility in resource-poor settings, necessitating a rapid, cost-effective, and sensitive point-of-care antigen detection method for SARS-CoV-2.
Innovation Solution
Nanomechanical sensors utilizing antibody-functionalized microcantilevers, which can detect SARS-CoV-2 antigens or antibodies with high sensitivity and specificity, integrated with a field-effect transistor (FET) for electrical detection, allowing for rapid and non-invasive sample collection through breath analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RT-PCR is used for SARS-CoV-2 detection, then diagnostic accuracy is improved, but turnaround time increases and accessibility decreases
Solution Approach 1:
The patent replaces the complex mechanical and chemical processes of RT-PCR with a nanomechanical sensing system. The microcantilever sensor detects SARS-CoV-2 antigens through physical binding events that cause measurable deflection, eliminating the need for thermal cycling, enzymatic reactions, and complex sample preparation required by RT-PCR, thereby reducing turnaround time while maintaining diagnostic accuracy
Solution Approach 2:
The patent changes the detection parameter from molecular amplification (RT-PCR) to direct antigen binding detection (nanomechanical sensing). By measuring the physical deflection of the microcantilever caused by antigen-antibody binding rather than amplifying viral RNA, the system achieves rapid detection within minutes while preserving high sensitivity and specificity
2Measurement precision
If RT-PCR is used for SARS-CoV-2 detection, then diagnostic accuracy is improved, but device complexity and operational requirements increase
Solution Approach 1:
The patent replaces sophisticated laboratory equipment (thermal cyclers, centrifuges, biosafety cabinets) with a simple nanomechanical sensor platform. The microcantilever device requires only basic sample application and can be read out with standard optical or electrical detection equipment, making the system suitable for point-of-care use in resource-limited settings while maintaining RT-PCR level accuracy
Solution Approach 2:
The patent employs disposable microcantilever sensors that can be mass-produced at low cost using standard microfabrication techniques. Each sensor is a single-use device that eliminates the need for expensive, complex, and reusable laboratory equipment, thereby reducing both device complexity and operational requirements while preserving diagnostic accuracy
3Loss of time
If antigen tests are used for SARS-CoV-2 detection, then turnaround time is reduced, but measurement precision decreases
Solution Approach 1:
The patent transitions from traditional planar antigen test formats to three-dimensional nanomechanical sensing. The microcantilever provides a vertical dimension for detection, where antigen binding causes measurable deflection perpendicular to the sensor surface. This dimensional change enhances the signal-to-noise ratio and detection sensitivity, achieving high measurement precision comparable to RT-PCR while maintaining rapid turnaround time
Solution Approach 2:
The patent changes the detection parameter from visual interpretation of test lines (prone to subjectivity and false readings) to quantitative measurement of microcantilever deflection. By measuring the physical displacement of the sensor with high precision instruments, the system achieves objective, accurate, and reproducible results within minutes, overcoming the limitations of conventional antigen tests
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 detection of SARS-CoV-2 antigens within minutes, even at low concentrations, with high sensitivity and specificity, and is suitable for point-of-care use, reducing the need for specialized equipment and trained personnel.
Implementation Method 1
an antibody configured to bind a target antigen or an antigen configured to bind a target antibody
Implementation Method 2
The microcantilever has an effective surface density of tethered antibodies or antigens thereon, which allows for the detections of antigens or antibodies present in a sample
Implementation Method 3
The sensors described herein may comprise a field-effect transistor, such as a MOSFET, which allows for electrical detection of antibody-antigen binding
Data Source
AI summary
Nanomechanical sensors comprising an antibody-functionalized microcantilever and methods of using the same are described herein.