Fluorescent Probes for Gram-Negative Bacteria Detection
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Solution Overview
Problem
Current methods for diagnosing ventilator-associated pneumonia (VAP) are inaccurate and invasive, leading to delayed and inadequate antibiotic therapy, which is harmful and increases mortality and morbidity, and existing point-of-care diagnostic tools are not suitable for intensive care settings due to limitations in detecting bacterial or fungal infections quickly and reliably.
Innovation Solution
A method using dual probes with specific fluorophores and binding moieties that allow for the in situ detection of bacteria and fungi, distinguishing between gram-negative and gram-positive bacteria, enabling accurate identification and treatment guidance without the need for invasive procedures or radioactive agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulmonary biopsy is used as the gold standard for VAP diagnosis, then diagnostic accuracy is improved, but patient harm increases due to the invasive nature of the procedure
Solution Approach 1:
The patent replaces the mechanical/invasive biopsy procedure with an optical detection system. Fluorescent probes are administered and imaged using optical microscopy to detect bacteria in lung tissue, substituting the need for physical tissue sampling and analysis.
Solution Approach 2:
The patent introduces fluorescent probes as an intermediary substance that binds to bacteria and makes them visible through fluorescence imaging. This mediator allows indirect detection of bacteria without requiring direct tissue sampling or culture methods.
2Productivity
If delayed antibiotic therapy is provided due to diagnostic uncertainty, then patient resource utilization is reduced, but clinical outcomes worsen due to adverse outcomes
Solution Approach 1:
The patent enables preliminary diagnosis of VAP through fluorescent imaging before antibiotic treatment decisions are made. This allows clinicians to confirm the presence of bacteria and initiate appropriate therapy without delay, improving both outcomes and resource utilization.
Solution Approach 2:
The patent provides immediate visual feedback through fluorescence imaging that shows whether bacteria are present and their location. This real-time feedback enables rapid clinical decision-making regarding antibiotic initiation and selection, eliminating the delay caused by uncertain diagnosis.
3Ease of operation
If non-specific clinical signs are used for VAP detection, then diagnostic simplicity is improved, but diagnostic accuracy deteriorates due to non-specificity
Solution Approach 1:
The patent uses fluorescent probes that emit specific colors when binding to bacteria, providing visually distinct and specific diagnostic information. The fluorescence signal changes from non-fluorescent to fluorescent, creating a clear, specific visual indicator of bacterial presence that overcomes the non-specificity of traditional clinical signs.
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, accurate identification of bacterial or fungal infections at the point of care, allowing for timely and appropriate antibiotic or antifungal treatment, reducing mortality and morbidity and improving healthcare resource management.
Implementation Method 1
The probe comprises a fluorophore and a binding moiety... allow visualisation of cells in vivo by an increase in fluorescence when the dye is internalised by specific cell types
Implementation Method 2
The binding moiety is adapted to bind to gram-negative bacteria
Data Source
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AI summary
A probe is provided comprising a label and a binding moiety, wherein the binding moiety is adapted to bind to gram-negative bacteria, and to substantially not bind to animal cells or gram-positive bacteria. A method of detecting the presence of bacteria in a target area is also provided, which allows the detection of bacteria generally, and the determination of whether that bacteria is gram negative or gram positive.