Retinal Amyloid Detection via Layer-Selective Optical Imaging
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Solution Overview
Problem
Current methods for detecting β-amyloid deposits in the eye, particularly in the retina, are unreliable and can lead to misdiagnoses due to the presence of β-amyloid deposits caused by age-related macular degeneration (AMD), and existing technologies are invasive or not effectively realized.
Innovation Solution
An optical method with high local resolution, using molecular markers such as Thioflavin S, Congo red, and β-amyloid-specific antibodies, combined with high-resolution devices like OCT and laser scanning ophthalmoscopes, for detecting β-amyloid and τ-PHF deposits in the retina, allowing for precise, non-invasive, and accurate imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorescence markers are used to detect β-amyloid deposits in the lens, then detection capability is improved, but the method becomes invasive and cannot be performed on patients with removed natural crystalline lens
Solution Approach 1:
The patent uses the retina as an intermediary target for detection. Instead of directly examining the crystalline lens (which may be removed or inaccessible), the method detects β-amyloid deposits in the retina, which serve as a proxy indicator for Alzheimer's disease. This intermediary approach maintains detection capability while avoiding the limitations of direct lens examination.
2Ease of operation
If β-amyloid detection is performed in the eye, then diagnosis of Alzheimer's disease is facilitated, but misdiagnosis risk increases due to β-amyloid deposits from AMD
Solution Approach 1:
The patent employs layer-selective detection to examine specific retinal layers where β-amyloid deposits associated with Alzheimer's disease occur, rather than examining the entire retina. This localized approach allows differentiation between Alzheimer's-related deposits and AMD-related deposits in drusen, thereby improving diagnostic accuracy while maintaining ease of operation.
Solution Approach 2:
The detection method segments the retinal examination into specific layers and regions. By focusing on particular retinal layers and using high local resolution, the method separates Alzheimer's-related β-amyloid deposits from AMD-related deposits in drusen, enabling more accurate diagnosis through spatial segmentation of the detection target.
3Measurement precision
If high local resolution better than layer thickness is achieved, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical imaging systems with optical coherence tomography (OCT), which uses light interference patterns to achieve high local resolution. This substitution of mechanical approaches with optical field-based methods enables superior measurement precision while managing device complexity through the use of established optical technologies.
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 reliable, locally resolved detection of β-amyloid and τ-PHF deposits with improved accuracy, reducing the risk of misdiagnoses and providing a non-invasive, cost-effective means for diagnosing Alzheimer's disease and monitoring therapy outcomes.
Implementation Method 1
U.S. Pat. No. 7,297,326 suggests the verification of the presence of β-amyloid deposits in the lens using special fluorescence markers
Implementation Method 2
using molecular markers such as Thioflavin S, Congo red, and β-amyloid-specific antibodies
Implementation Method 3
high-resolution devices like OCT and laser scanning ophthalmoscopes
Implementation Method 4
high-resolution devices like OCT and laser scanning ophthalmoscopes
Data Source
AI summary
A method and devices for detecting deposits, in particular amyloid plaques, in the eye, in particular in the human eye. The subject is an optical method for detecting deposits, in particular β-amyloid, in the retina, which is locally resolved and wherein the local resolution is better than the layer thickness of individual layers of the retina. The invention includes a device for optically detecting β-amyloid in the retina, which generates a locally resolved image of the retina and wherein the local resolution is better than the layer thickness of individual layers of the retina.