Quantum Dot Fluorescence for Sentinel Lymph Node Detection
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Solution Overview
Problem
Conventional methods for detecting sentinel lymph nodes during cancer surgery face challenges such as low accuracy in fluorescence measurement, contamination, allergic reactions, and difficulty in observing lymph flow in complex lymphatic systems, leading to potential missed metastasis detection.
Innovation Solution
A method involving the use of quantum dots injected into sentinel lymph nodes, where fluorescence intensity is measured using a confocal fluorescence microscope to detect afferent lymph vessel inflow regions, allowing for precise identification of regions with high fluorescence, which may indicate metastasis, and the use of antibodies specific to cells for enhanced detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional coloring matter or RI colloid is used as tracer, then sentinel lymph node can be identified, but detection sensitivity and accuracy are insufficient
Solution Approach 1:
The patent changes the physical-chemical parameters of the tracer by using quantum dots with specific size ranges (5-50 nm diameter) and fluorescent properties. These parameter changes enable higher detection sensitivity through fluorescent imaging while avoiding the harmful effects of conventional tracers such as allergic reactions to coloring matter and contamination issues
Solution Approach 2:
The patent substitutes the mechanical/invasive methods of conventional tracer administration with a nanoscale quantum dot-based fluorescent tracking system. This replacement eliminates the need for large particle colloids that cause shine-through phenomena and enables real-time observation of lymph flow with high precision
2Speed
If RI colloid is used as tracer, then lymph node can be identified, but real-time lymph flow observation is poor due to large particle size
Solution Approach 1:
The patent dramatically reduces the particle diameter parameter from the several hundred nanometers to several ten micrometers range of RI colloid to 5-50 nm for quantum dots. This parameter change enables the tracer to move freely with lymph flow and be detected in real-time, solving the problem of poor real-time observation speed
Solution Approach 2:
The patent replaces the radioactive colloid system with a fluorescent quantum dot system that allows optical detection. This substitution enables real-time visualization of lymph flow dynamics without the resolution limitations and shine-through phenomena associated with larger radioactive particles
3Measurement precision
If conventional staining method is used for metastasis diagnosis, then cancer cells can be detected, but detection accuracy is low due to limited tissue section observation
Solution Approach 1:
The patent substitutes conventional histological staining methods with quantum dot-based fluorescent tracking. This substitution enables the entire lymph node tissue to be observed through fluorescent imaging rather than requiring multiple tissue sections, thereby dramatically increasing the observable area and detection accuracy for metastatic cells
Solution Approach 2:
The patent utilizes the fluorescent color emission properties of quantum dots to differentiate and detect metastatic cancer cells. The fluorescent signal from quantum dots bound to cancer cell markers provides high-contrast visualization that enhances detection accuracy compared to conventional hematoxylin-eosin staining
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
This approach enables accurate detection of regions with potential metastasis in sentinel lymph nodes, enhancing detection accuracy for cancer cells and minimizing the risk of missed diagnoses by quantitatively analyzing fluorescence intensity and distribution.
Implementation Method 1
measuring fluorescence intensity for each of a plurality of regions in an already extirpated sentinel lymph node into which quantum dots are injected
Data Source
AI summary
Regions where metastatic cancer cells can exist are detected with high accuracy in a sentinel lymph node. Quantum dots are injected into the vicinity of a cancer in a living body, thereby identifying the location of the sentinel lymph node by means of fluorescence. Subsequently, the sentinel lymph node is extracted. With respect to the sentinel lymph node extracted with quantum dots injected, structural analysis is conducted by means of precision fluorescence measurement which uses a confocal fluorescence microscope for monomolecular observation. Specifically, the fluorescence intensity is measured with respect to each of multiple areas in the sentinel lymph nodes, and out of the multiple areas measured, one or more areas are detected as afferent lymph vessel inflow regions in descending order of fluorescence intensity.