Waveguide Interferometer Microfluidic Sensor for Rapid Bacterial Detection
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Solution Overview
Problem
Current methods for determining bacterial counts and antibiotic susceptibility in bodily fluids are time-consuming, often leading to inappropriate antibiotic prescriptions and the development of antibiotic-resistant bacteria, as culture-based tests can take several days to produce results.
Innovation Solution
A sensor device utilizing a waveguide interferometer with a sensing arm and a reference arm, integrated with a microfluidic channel and trapping arrangement, which measures changes in microorganism concentration by interacting with sensing light and allowing for the detection of bacterial growth or decline, enabling rapid assessment of bacterial susceptibility to antibiotics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If culture-based tests are used to determine bacterial counts and antibiotic susceptibility, then measurement precision is improved, but loss of time increases significantly as tests can take several days to produce results
Solution Approach 1:
The patent replaces traditional culture-based mechanical/biological testing methods with an optical sensing system using waveguide interferometers. The sensor device detects bacterial concentration changes through optical interference patterns, eliminating the need for multi-day culture growth while providing rapid quantitative measurements of bacterial counts and antibiotic susceptibility.
Solution Approach 2:
The invention changes the measurement parameter from indirect culture-based assessment to direct optical detection of bacterial concentration. By monitoring changes in optical path length and interference patterns caused by bacterial presence and growth, the system achieves rapid measurement without waiting for cultural confirmation, reducing test duration from days to minutes.
2Speed
If antibiotic prescription is made before diagnostic testing, then treatment speed is improved, but reliability deteriorates due to potential mismatch between prescribed and effective antibiotics
Solution Approach 1:
The patent enables preliminary diagnostic testing to be performed immediately alongside antibiotic prescription rather than days later. The rapid sensor device provides real-time or near-real-time bacterial identification and antibiotic susceptibility data, allowing clinicians to make informed prescribing decisions before treatment begins, thus maintaining both speed and reliability.
Solution Approach 2:
The invention introduces rapid feedback loops where diagnostic results are available within minutes rather than days. This immediate feedback allows clinicians to adjust antibiotic prescriptions based on actual bacterial susceptibility profiles, ensuring the most effective treatment is selected from the outset while maintaining rapid treatment initiation.
3Loss of time
If rapid sensing is implemented using waveguide interferometer, then loss of time is reduced, but device complexity increases due to integration of microfluidic channels and trapping arrangements
Solution Approach 1:
The patent merges multiple functions into a single integrated sensor device: the waveguide interferometer structure incorporates microfluidic channels directly within the waveguide paths, and trapping arrangements are integrated at specific locations along the channels. This consolidation achieves rapid sensing capability while managing device complexity through functional integration rather than separate components.
Solution Approach 2:
The waveguide interferometer structure serves multiple functions simultaneously: it acts as the optical sensing element, provides the microfluidic channel structure for sample flow, and incorporates trapping regions for bacterial concentration. This multi-functionality reduces the need for separate components, balancing rapid sensing capability with manageable 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
The sensor device provides real-time or near-real-time monitoring of bacterial concentration and susceptibility, potentially reducing the prescription of ineffective antibiotics and slowing antibiotic resistance by offering rapid diagnostic capabilities.
Implementation Method 1
the waveguide interferometer is configured to interfere the sensing light with the reference light, and wherein the waveguide interferometer and the microfluidic channel are configured to allow the sensing light to interact with the fluid and the micro-organisms in the sensing region
Implementation Method 2
The sensing arm and the microfluidic channel may be configured to allow an evanescent field of the guided optical mode to interact with the bacteria in the sensing region
Data Source
AI summary
A sensor device for use in sensing a change in a concentration of micro-organisms, comprises a waveguide interferometer having a sensing arm and a reference arm, a microfluidic channel for a fluid containing the micro-organisms, and a trapping arrangement in the microfluidic channel for physically trapping the micro-organisms when the fluid flows along the microfluidic channel so as to concentrate the micro-organisms in a sensing region of the microfluidic channel. The sensing arm is configured to guide sensing light, the reference arm is configured to guide reference light, and the waveguide interferometer is configured to interfere the sensing light with the reference light. The waveguide interferometer and the microfluidic channel are configured to allow the sensing light to interact with the fluid and the micro-organisms in the sensing region of the microfluidic channel.