Lateral Flow Assay for Rapid Parathyroid Identification
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Solution Overview
Problem
Locating and identifying parathyroid glands during surgery is challenging due to their small size, anatomical variability, and potential for being misidentified with existing technologies, which can lead to complications such as hyperparathyroidism and delayed surgical procedures.
Innovation Solution
A rapid parathormone identification test module using an immunochromatographic lateral flow assay cassette that detects parathyroid hormone levels through needle aspiration samples, providing immediate visual or digital results to confirm the presence of parathyroid glands, allowing for precise localization during surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If needle aspiration sampling with serum PTH immunoassay is used, then parathyroid identification accuracy is improved, but surgical time and complexity increase
Solution Approach 1:
The patent extracts the PTH detection function from the centralized laboratory immunoassay system and places it directly at the surgical site through a portable lateral flow assay device. This extraction enables rapid on-site testing without requiring sample transport to external laboratories, thereby maintaining high measurement precision while dramatically reducing surgical time and procedural complexity.
Solution Approach 2:
The patent introduces a lateral flow assay cassette as an intermediary device between the tissue sample and the final diagnostic result. This intermediary system includes pre-loaded reagents (anti-PTH antibodies conjugated to gold particles, control antibodies) that enable rapid PTH detection directly in the surgical field, eliminating the need for complex laboratory processing while maintaining diagnostic accuracy.
2Measurement precision
If quantitative PTH measurement is performed, then parathyroid gland identification accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a disposable lateral flow assay cassette that integrates all necessary reagents (anti-PTH antibodies, control antibodies, gold particle conjugates) into a single-use device. This disposable approach eliminates the need for complex, expensive, and reusable laboratory equipment while maintaining quantitative PTH measurement capability. Each cassette is pre-prepared and discarded after one use, simplifying the overall system complexity.
Solution Approach 2:
The patent changes the measurement parameter from requiring complex quantitative laboratory analysis to a simpler visual or semi-quantitative colorimetric readout based on gold particle aggregation. The intensity of the color change at the test line correlates with PTH concentration, providing sufficient diagnostic accuracy with much simpler detection equipment.
3Reliability
If traditional parathyroid location methods are used, then surgical procedure simplicity is maintained, but identification reliability decreases
Solution Approach 1:
The patent segments the parathyroid identification process into distinct functional components: (1) visual inspection of tissue morphology, (2) needle aspiration sampling, (3) lateral flow assay testing, and (4) result interpretation. This segmentation allows each step to be performed independently with specialized tools, improving overall reliability while keeping each individual step simple and manageable for the surgical team.
Solution Approach 2:
The patent implements immediate feedback through the lateral flow assay that provides real-time PTH measurement results during surgery. The rapid colorimetric readout (within minutes) gives the surgeon immediate confirmation of parathyroid tissue identification, allowing for instant verification and correction if needed, thereby significantly improving identification reliability without adding substantial procedural 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 test module significantly speeds up the surgical process, achieving 100% accuracy in identifying parathyroid tissue, reducing the risk of misidentification and complications, and providing immediate feedback to surgeons, thus making parathyroid surgery faster and safer.
Implementation Method 1
The display module utilizes immunochromatographic lateral flow assay methods including test strips chemically modified to receive, react with, and provide an output signal display
Implementation Method 2
test strips chemically modified to receive, react with, and provide an output signal display that is readable visually or by a specially programed reading and results display unit
Data Source
AI summary
A testing device for locating parathyroid glands comprises a module for receiving an aspirated sample of fluid and tissue taken from a suspected parathyroid gland. The module contains a first membrane containing an anti-parathyroid antibody conjugated to nanoparticles for receiving the aspirated sample, resulting in the formation of a sample/conjugate mixture. That mixture flows across adjacent membranes to a test location containing anti-parathyroid and an indicator for parathormone. Presence of a sufficient quantity of parathormone in the conjugate of aspirated sample reaching the test line is evidenced by a readable change in the test line appearance.