Laser Speckle Contrast Imaging for Parathyroid Viability Assessment
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Solution Overview
Problem
There is a critical need for a real-time, contrast-free, and objective method for assessing the viability of parathyroid glands intraoperatively, as current methods are subjective and may lead to post-surgical hypoparathyroidism.
Innovation Solution
The use of laser speckle contrast imaging (LSCI) to differentiate between vascularized and compromised parathyroid glands by analyzing speckle patterns and calculating speckle contrast values, which are displayed in real-time to the surgeon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subjective visual assessment is used to evaluate parathyroid gland vascularity, then the method is simple and quick, but the accuracy and reliability are insufficient leading to post-surgical hypoparathyroidism
Solution Approach 1:
The patent replaces subjective visual assessment with laser speckle contrast imaging, an optical measurement system that objectively quantifies blood flow dynamics. The LSCI system uses laser light scattering properties to non-invasively measure microcirculatory perfusion, substituting the surgeon's visual judgment with an automated optical measurement system that provides quantitative data on parathyroid gland vascularity.
Solution Approach 2:
The patent changes the assessment parameter from qualitative visual appearance to quantitative speckle contrast values. By measuring the temporal frequency of speckle pattern changes and calculating contrast ratios, the system transforms subjective visual assessment into objective numerical parameters that reliably indicate blood flow status, enabling accurate differentiation between viable and non-viable glands.
2Reliability
If real-time assessment method is implemented, then post-surgical hypoparathyroidism risk is reduced, but disruption to surgical workflow may increase
Solution Approach 1:
The LSCI system is designed to be integrated into the existing surgical workflow without requiring additional resources or complex operations. The system operates autonomously to provide real-time feedback, allowing the surgical team to maintain their natural workflow patterns while benefiting from objective viability assessment. The system self-regulates by continuously monitoring and providing immediate feedback when needed.
Solution Approach 2:
The patent implements real-time feedback by continuously acquiring speckle contrast images and providing immediate visual and quantitative information about parathyroid gland vascularity during the surgical procedure. This feedback loop allows the surgical team to make informed decisions about gland removal or preservation at the moment of need, improving reliability without significantly delaying surgical progress.
3Object-affected harmful factors
If contrast-free imaging is used, then safety and simplicity are improved, but image quality and differentiation capability may be reduced
Solution Approach 1:
The patent exploits the natural color and optical properties of blood and tissue without requiring external contrast agents. The laser speckle contrast imaging detects changes in light scattering caused by blood flow dynamics, using the inherent optical properties of the parathyroid gland and its blood supply. This approach maintains safety by avoiding contrast agents while achieving precise differentiation through optical property analysis.
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
LSCI provides accurate, real-time assessment of parathyroid gland viability with high sensitivity and specificity, reducing the risk of post-surgical hypoparathyroidism and minimizing disruption to the surgical workflow.
Implementation Method 1
obtaining speckle contrast images of a parathyroid gland of a patient
Implementation Method 2
analyzing speckle patterns and calculating speckle contrast values
Implementation Method 3
processing the acquired images to obtain speckle contrast images
Data Source
AI summary
One aspect of the invention relates to an apparatus for assessment of parathyroid gland viability comprising a diffuser configured to diffuse a beam of light onto a tissue surface of a parathyroid gland of a patient to illuminate the tissue surface; and means for obtaining speckle contrast images for the assessment of parathyroid gland viability.