Two-Chamber Light Scattering Analysis for Microbial Samples
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Solution Overview
Problem
Existing methods for measuring properties of biological samples, such as bacteria, are complex, require extensive training, and contribute to antibiotic resistance due to inefficient point-of-care testing, leading to unnecessary antibiotic prescriptions.
Innovation Solution
A system comprising two chambers, a sample chamber and a detection chamber, with reflective walls to integrate and diffuse light multiple times, allowing for accurate measurement of scattered light using a detector, enabling rapid and convenient detection of microorganisms and their susceptibility to antibiotics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow cytometers are used to measure bacterial properties, then measurement speed and cell counting accuracy are improved, but device complexity and operational difficulty increase
Solution Approach 1:
The system is divided into two separate chambers: a sample chamber for holding the bacterial sample and a detection chamber for light detection. This segmentation allows each chamber to be optimized for its specific function while simplifying the overall device structure compared to integrated flow cytometers.
Solution Approach 2:
The invention extracts the core measurement function from complex flow cytometer systems, isolating only the essential components (light source, sample chamber, detection chamber, detector) needed for bacterial property measurement, thereby reducing device complexity while maintaining measurement capability.
2Measurement precision
If integrating sphere nephelometers are used to collect scattered light, then light collection efficiency is improved, but unscattered light passing through the sphere creates measurement interference
Solution Approach 1:
The optical path is segmented into distinct regions: the sample chamber where scattering occurs and the detection chamber where scattered light is detected. This spatial segmentation prevents unscattered light from reaching the detector, eliminating the interference problem inherent in integrating sphere designs.
Solution Approach 2:
The invention extracts only the scattered light component for measurement by using reflective walls in the detection chamber to redirect scattered light to the detector while blocking the direct unscattered light path, thereby eliminating measurement interference.
3Measurement precision
If absorption spectrophotometers are used to measure bacterial concentration, then cell counting capability is improved, but the method cannot provide information about bacterial size and granularity
Solution Approach 1:
The detection chamber is designed with reflective walls that redirect scattered light to the detector, enabling the system to capture angular distribution information about scattered light. This local optical design allows simultaneous measurement of bacterial concentration and size/granularity properties from the same scattered light signal.
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
Facilitates rapid, accurate, and cost-effective point-of-care testing for microbial presence and antibiotic susceptibility, reducing antibiotic overuse and resistance by providing a simple and reliable method for sample analysis.
Implementation Method 1
Light is incident on a sample and is scattered at different angles. Detectors placed at discrete intervals around a chamber collect the scattered light.
Implementation Method 2
a system comprising two chambers, a sample chamber and a detection chamber, with reflective walls to integrate and diffuse light multiple times
Data Source
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AI summary
An apparatus for analysing a liquid sample comprising particles, comprises: a first chamber (12) and a second chamber (14), and an optical path between the first chamber (12) and the second chamber (14), wherein: the first chamber (12) is a sample chamber comprising: a sample space for receiving the sample; a light input (24) for input of light into the first chamber (12) for interaction with the sample; and an exit aperture (26) arranged for scattered and/or reflected light to pass from the first chamber via the optical path to the second chamber (14); the second chamber (14) is a detection chamber comprising: an input aperture (28) for receiving light from the optical path; and a detector (25) for detecting, or a detector aperture for receiving, light to be detected; wherein the first chamber (12) and the second chamber (14) provide at least one light integrating volume, and wherein the first chamber (12) is configured such that in operation the liquid sample is present in the first chamber (12) and isolated from the second chamber (14).