Trypan Blue Staining for Cataract Capsule Visualization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for cataract surgery using Trypan Blue dye face toxicity concerns at higher concentrations, limiting visualization effectiveness and safety, especially for longer exposure times.
Innovation Solution
An ophthalmic solution with Trypan Blue at concentrations of 0.2 to 0.45% by weight, applied for less than a minute, provides faster and darker staining of lens capsule tissues, enhancing visualization without toxic effects by diffusing into the lens capsule and being gradually washed out, allowing safe visualization of tissue boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Trypan Blue concentration is increased to improve visualization, then staining effectiveness and contrast are improved, but toxicity to intraocular cells increases
Solution Approach 1:
The patent applies parameter changes by optimizing the Trypan Blue concentration to a specific range (0.06%-0.15%) that balances visualization effectiveness with safety. This concentration range provides sufficient staining contrast for capsulotomy visualization while remaining below toxic thresholds for intraocular cells, directly resolving the contradiction between improved visualization and reduced toxicity
Solution Approach 2:
The patent implements periodic action through controlled, brief exposure of the dye to the eye (typically less than 1 minute) followed by immediate rinsing. This time-limited application allows the dye to achieve adequate staining of the lens capsule while minimizing the duration of exposure to toxic levels, thereby maintaining visualization benefits while protecting sensitive intraocular cells
2Quantity of substance
If Trypan Blue concentration is increased to achieve darker staining, then visualization of tissue boundaries is improved, but residual dye toxicity increases
Solution Approach 1:
The patent applies partial action by using a moderate concentration range (0.06%-0.15%) that achieves sufficient but not excessive staining. This partial staining approach provides adequate contrast for visualizing tissue boundaries and capsulotomy margins without creating excessive residual dye concentrations that would pose toxicity risks, thus balancing visualization quality with safety
3Duration of action of moving object
If exposure time is extended to improve staining, then visualization effectiveness is improved, but cell toxicity increases
Solution Approach 1:
The patent implements periodic action through controlled, brief exposure of the dye to the eye (typically less than 1 minute) followed by immediate rinsing. This time-limited application allows the dye to achieve adequate staining of the lens capsule while minimizing the duration of exposure to toxic levels, thereby maintaining visualization benefits while protecting sensitive intraocular cells
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 solution enables safer and more effective visualization of anterior and posterior lens capsule tissues and capsulotomy boundaries with improved contrast and reduced toxicity risks, as the dye concentration in the lens capsule exceeds toxicity thresholds without harming sensitive eye cells.
Implementation Method 1
Trypan blue dissolved in a neutral pH aqueous solution has its maximum absorption in the orange region of the spectrum about 590 nm
Implementation Method 2
No pharmacological, immunological or metabolic means is involved in the Trypan Blue staining process, i.e., no covalent bonds to the dye are formed
Data Source
AI summary
The invention relates generally to the use of dyes to enhance visualization of tissues and boundaries of openings in tissues during cataract surgery.