CELIF Breath Acetone Detection for Diabetes Monitoring
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Solution Overview
Problem
Current methods for diagnosing and monitoring diabetes-related ketoacidosis, particularly in children and undiagnosed type 1 diabetes, face challenges due to invasive blood sampling issues, inaccurate results, and the need for timely and non-invasive monitoring of ketone levels in breath, especially with high selectivity and real-time capabilities.
Innovation Solution
The use of cavity-enhanced laser-induced fluorescence (CELIF) technology for real-time measurement of acetone concentrations in exhaled breath, which combines cavity ring-down spectroscopy and laser-induced fluorescence, allowing for absolute concentration detection and minimizing interference from other breath components, enabling portable and affordable point-of-care monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blood sampling methods are used for ketone measurement, then diagnostic accuracy can be achieved, but invasive procedures and sampling difficulties arise
Solution Approach 1:
The patent replaces the mechanical/invasive blood sampling system with an optical detection system (CELIF) that measures acetone in breath. The laser-based fluorescence detection eliminates the need for needles, tubes, and manual blood collection while maintaining diagnostic accuracy through non-invasive breath analysis.
Solution Approach 2:
The patent introduces breath acetone as an intermediary marker that correlates with blood ketone levels. Instead of directly measuring blood ketones, the system measures acetone in exhaled breath, which serves as a non-invasive proxy indicator for ketone metabolism status.
2Measurement precision
If conventional spectroscopic methods are used for breath analysis, then portability can be achieved, but measurement precision and selectivity deteriorate
Solution Approach 1:
The patent changes the detection parameter from direct absorption spectroscopy to laser-induced fluorescence. This parameter change enables detection of acetone at much lower concentrations (parts per billion level) with higher selectivity, as fluorescence provides a more specific signal that is less susceptible to interference from other breath components.
Solution Approach 2:
The patent merges cavity ring-down spectroscopy (CRDS) with laser-induced fluorescence (LIF) to create CELIF. This combination integrates the high sensitivity of CRDS with the high selectivity of LIF, achieving both precise quantification and specific identification of acetone in the complex breath matrix.
3Productivity
If high concentrations of water and other breath components are present, then real-time monitoring is possible, but selectivity and sensitivity to acetone deteriorate
Solution Approach 1:
The patent applies local quality enhancement by using a focused laser beam that interacts with a specific localized region of the breath sample in the optical cavity. This spatial localization of the measurement interaction improves signal-to-noise ratio and selectivity for acetone detection amidst the complex mixture of breath components.
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
CELIF technology provides accurate, real-time monitoring of acetone levels in breath, addressing the limitations of existing methods by offering high selectivity and sensitivity, facilitating timely and confident treatment decisions in diabetes management and other applications such as epilepsy and sports performance.
Implementation Method 1
cavity-enhanced laser-induced fluorescence (CELIF) technology for real-time measurement of acetone concentrations in exhaled breath
Implementation Method 2
combines cavity ring-down spectroscopy and laser-induced fluorescence
Data Source
AI summary
The invention relates to a method for measurement and monitoring of analytes, for example ketones, particularly but not exclusively acetone in human or other mammalian breath. The invention also relates to apparatus for use in performance of the method. The present invention uses a spectroscopic technique known as CELIF which is a direct combination of the well-established and powerful laser-spectroscopic techniques cavity ring-down spectroscopy and laser-induced fluorescence. The method utilises a flow body to control a flow of sample gas through a laser beam.