Multi-modal Biosensor Integrating Acoustic and Optical Detection
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Solution Overview
Problem
Existing biosensors can only provide limited and inaccurate information about bio-interactions due to relying on single transduction principles, requiring multiple techniques and being slow and complex, which complicates the understanding of bio-interactions and often leads to erroneous conclusions.
Innovation Solution
A multi-modal biosensor system that integrates optical and acoustic label-free sensing technologies on a single platform, using a vibrating plate with piezoelectric material, actuated electrodes, and an optical support structure to detect changes in vibration and light, providing complementary information on molecular surface density, mass, hydration, and binding kinetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transduction principle is used in label-free biosensors, then the device complexity is reduced, but the measurement precision and reliability of bio-interaction information is insufficient
Solution Approach 1:
The patent combines optical and acoustic transduction principles into a single integrated biosensor platform. The optical detector uses interferometry to measure refractive index changes, while the acoustic detector (QCM) measures mass changes. By merging these two different transduction mechanisms, the system achieves comprehensive characterization of bio-interactions with both high precision and reliability, resolving the contradiction between device complexity and measurement quality.
Solution Approach 2:
The biosensor platform is designed to perform multiple functions simultaneously: it can detect mass changes, refractive index changes, and provide information about binding kinetics and thermodynamics. This multi-functional capability allows a single device to replace what would traditionally require multiple separate techniques, achieving comprehensive bio-interaction analysis without proportionally increasing device complexity.
2Measurement precision
If multiple techniques are used to obtain different information of bio-interactions, then the measurement precision is improved, but the productivity and ease of operation deteriorate due to slow and complicated procedures
Solution Approach 1:
The patent integrates optical and acoustic detection capabilities into a single simultaneous measurement system. Both detectors operate concurrently during the same experiment, allowing comprehensive bio-interaction information to be obtained in real-time without requiring sequential experiments. This merging approach maintains high measurement precision while dramatically improving productivity by eliminating the need for multiple separate experimental runs.
Solution Approach 2:
The biosensor enables continuous real-time monitoring of bio-interactions throughout the entire binding process. Both optical and acoustic signals are continuously recorded, providing uninterrupted information about association and dissociation kinetics. This continuous measurement approach improves productivity by eliminating the need for repeated experiments while maintaining high precision through multiple simultaneous detection modes.
3Measurement precision
If multiple techniques are used to analyze bio-interactions, then the measurement precision is improved, but the device complexity increases requiring multiple separate experiments
Solution Approach 1:
The patent merges optical and acoustic detection systems into a single integrated device with a unified sensor surface. The optical detector and acoustic detector share the same sample chamber and measurement geometry, allowing both transduction mechanisms to operate simultaneously on the same bio-interaction event. This integration maintains high measurement precision through multi-modal detection while avoiding the device complexity of multiple separate experimental setups.
Solution Approach 2:
The single biosensor device is designed to perform multiple detection functions: mass measurement via QCM, refractive index measurement via optical interferometry, and derivation of binding parameters. This universal platform consolidates what would traditionally require multiple separate instruments into one device, achieving comprehensive measurement precision without proportionally increasing device complexity.
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 accurate and rapid assessment of bio-interactions by distinguishing specific and non-specific binding, resolving molecular orientation, and providing detailed mechanistic insights into binding reactions, overcoming the limitations of single-modal biosensors.
Implementation Method 1
The vibrating plate is comprised of piezoelectric material
Implementation Method 2
A light detector is configured to capture light reflected from the outwardly facing surface of the optical support structure
Implementation Method 3
An actuator is interfaced with the vibrating plate and operable to vibrate the vibrating plate along the plane
Data Source
AI summary
A multi-modal biosensor system includes a vibrating plate orientated along a plane. An actuator is interfaced with the vibrating plate and operable to vibrate the vibrating plate along the plane. The actuator includes two electrodes rigidly affixed to the vibrating plate. An optical support structure is rigidly affixed to the vibrating plate, and provides an outwardly facing surface to receive a measurement sample. A light source is configured to project light onto the outwardly facing surface of the optical support structure. A light detector is configured to capture light reflected from the outwardly facing surface of the optical support structure. A controller interfaces with the two electrodes and the light detector. The controller operates to detect changes in the vibrating motion of the vibrating plate concurrently with detecting changes in the light captured by the light detector.