Laser Ablation System for Deep Sclerectomy
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Solution Overview
Problem
Deep sclerectomy, a non-penetrating glaucoma surgery, faces challenges due to high rates of inadvertent perforation and a long learning curve, which limits its use as a common treatment for raised intraocular pressure, as it requires precise dissection of scleral tissue and has complications related to insufficient filtration and scarring.
Innovation Solution
A laser ablation system is developed for non-penetrating sclerectomy, using a CO2 laser to ablate scleral tissue overlying the Schlemm canal and trabecular meshwork with specific parameters to achieve percolation without macro-penetration, incorporating optical design and post-operative treatments to reduce scarring and thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual surgical instruments are used for deep sclerectomy, then the procedure can be performed with conventional tools, but the rate of inadvertent perforation increases and the learning curve lengthens
Solution Approach 1:
The patent replaces manual mechanical surgical instruments with a laser system for dissection and ablation of scleral tissue. The laser provides precise control through optical parameters (power, pulse duration, wavelength) rather than mechanical manipulation, eliminating the need for surgeons to develop extensive manual dissection skills while maintaining or improving precision and reducing perforation rates.
2Reliability
If the scleral flap is dissected to more than 90% of its depth to achieve effective filtration, then the intraocular pressure reduction improves, but the risk of inadvertent perforation increases
Solution Approach 1:
The laser system replaces mechanical dissection with optical ablation, allowing the scleral flap to be removed to the required depth (more than 90%) with precise control over the ablation process. The laser parameters can be adjusted to achieve the necessary depth while providing real-time feedback and control, eliminating the guesswork and variability inherent in manual dissection and significantly reducing the risk of accidental perforation.
Solution Approach 2:
The patent utilizes changes in laser parameters (power, pulse duration, wavelength, scan speed) to control the depth and precision of scleral ablation. By optimizing these parameters, the system achieves effective filtration (requiring deep scleral removal) while maintaining safety margins to prevent perforation, something difficult to achieve with manual instruments where the surgeon must estimate depth visually.
3Object-affected harmful factors
If a residual intact scleral layer of only several tens of microns is left to minimize perforation risk, then the safety improves, but the surgical precision required increases significantly
Solution Approach 1:
The laser system provides superior precision compared to manual instruments, capable of removing scleral tissue with micrometer-level accuracy. This allows the surgeon to leave a residual intact scleral layer of only several tens of microns (as required for safety) while maintaining exact control over the ablation depth, something that would be extremely difficult to achieve consistently with manual surgical tools.
Solution Approach 2:
By precisely controlling laser parameters (especially power, pulse duration, and scan speed), the system achieves the required precision to work with minimal residual scleral thickness. The laser can be programmed to ablate at specific depths and rates, providing a level of manufacturing-like precision that transforms the surgical procedure from a skill-dependent manual task to a controllable optical process.
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 laser ablation system effectively reduces intraocular pressure by creating a filtration pathway without penetrating the eye, minimizing complications and improving surgical precision, thus enhancing the efficacy of deep sclerectomy.
Implementation Method 1
A laser ablation system is developed for non-penetrating sclerectomy, using a CO2 laser to ablate scleral tissue overlying the Schlemm canal and trabecular meshwork
Implementation Method 2
activating said laser according to said parameters to achieve said percolation, by ablating scleral tissue overlying said percolation layer
Data Source
AI summary
An ophthalmic laser ablation system is described with various optional features, some especially suitable for non-penetrating filtration on an eye. In one example, focusing of an ablation laser uses a movable lens coupled to a pair of converging light sources, which converge at the focal distance of the lens. In another example, laser ablation settings are selected for optimal ablation and minimal amount of thermal damage of a layer of percolating scleral tissue.