Patterned Retinal Photocoagulation for Ischemia Control
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Solution Overview
Problem
Current treatments for retinal vascular diseases, such as diabetic retinopathy and macular edema, often cause complications like peripheral vision loss and macular edema due to indiscriminate laser burns, failing to address the non-random occlusion of capillaries and resulting ischemia.
Innovation Solution
A method and system for generating patterned photocoagulation burns with precise spacing and positioning to maintain retinal oxygenation, using computer-guided laser systems to prevent the spread of ischemia and occlusion by creating oxygenated barriers between capillaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pan-retinal photocoagulation is performed with large laser burns scattered in the peripheral retina, then the risk of vision loss from neovascularization is reduced, but peripheral vision is lost and macular edema increases
Solution Approach 1:
The invention divides the retinal treatment into two distinct segments: (1) a grid pattern of small burns (50-150 microns) applied to the macula and posterior pole, and (2) pan-retinal photocoagulation burns applied to the peripheral retina. This segmentation allows each region to be treated with appropriately sized burns, preventing the spread of ischemia in the macula while still addressing neovascularization risk peripherally.
Solution Approach 2:
The invention applies different burn sizes and patterns to different retinal regions based on their specific pathological needs. Small dense grid burns (50-150 microns) are used in the macula where capillary occlusion spreads locally, while larger PRP burns are used peripherally where neovascularization is the primary concern. This local differentiation optimizes treatment efficacy while minimizing harmful side effects in each region.
2Reliability
If laser burns are applied to destroy photoreceptors and reduce oxygen consumption, then VEGF levels decrease and neovascularization regresses, but the treatment fails to prevent spread of ischemia in the macula
Solution Approach 1:
The invention uses fluorescein angiography to identify areas of capillary non-perfusion and ischemia, then applies the grid burn pattern specifically to those identified regions. This feedback-driven approach ensures burns are placed precisely where needed to prevent ischemia spread, rather than using random or uniform patterns. The treatment is guided by real-time imaging feedback to optimize burn placement.
Solution Approach 2:
The invention replaces manual, operator-dependent burn placement with an automated computer-guided system that uses angiographic images to determine precise burn locations and patterns. This substitution of mechanical/manual positioning with automated image-guided positioning significantly improves the precision and reproducibility of burn spacing and placement, ensuring consistent application of the small grid pattern.
3Reliability
If grid pattern laser burns are applied to the macula, then oxygenation is improved and ischemia spread is prevented, but the treatment lacks guidance on where to place burns
Solution Approach 1:
The invention uses fluorescein angiography to provide real-time feedback on the location and extent of capillary non-perfusion and ischemic areas in the macula. This imaging feedback guides the precise placement of small grid burns (50-150 microns) to the specific regions that need protection from ischemia spread, rather than applying burns uniformly across the entire macula. The feedback ensures treatment is targeted to pathologically relevant areas.
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
Prevents the progression of retinal ischemia and macular edema by maintaining retinal oxygenation, minimizing tissue damage, and preserving peripheral vision, while effectively treating existing ischemic areas.
Implementation Method 1
The treatment relies on lasers to destroy photoreceptors in the retina... laser treatment is the most common approach... generating patterned photocoagulation burns with precise spacing and positioning
Implementation Method 2
Destruction of some of the eye's photoreceptors by PRP allows for oxygen to be available... lasers to destroy photoreceptors
Data Source
Figure 1A~1C
Figure 2A~2D
Figure 3A~3D
AI summary
This disclosure relates to methods for treatment or prevention of retinal vascular disease by photocoagulation. More specifically, this disclosure relates to an improved technique for the placement of retinal burns so as to prevent the development of hypoxia and progression of ischemia in retinal tissue, including the macula. The methods can also be employed to prevent potential ischemic tissue damage in diabetic, pre-diabetic or other patients with ischemic retinal vascular disease, or those at risk of ischemic retinal vascular disease.