Corneal Cross-Linking Feedback Control for Ectasia Prevention
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Solution Overview
Problem
Current eye therapy treatments, such as LASIK and thermokeratoplasty, face challenges in maintaining the stability and biomechanical strength of corneal tissue post-procedure, leading to complications like post-LASIK ectasia due to ongoing changes in corneal collagen fibrils.
Innovation Solution
A system for controlled cross-linking in corneal tissue using a cross-linking agent and a light source to initiate molecular cross-linking, with a delivery system that includes an applicator, optical elements, and a controller for precise application and activation, along with monitoring using interferometry and feedback systems to stabilize and strengthen the cornea.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser-assisted in-situ keratomileusis (LASIK) is used to reshape the cornea, then vision correction is achieved, but corneal structural stability deteriorates leading to post-LASIK ectasia
Solution Approach 1:
The patent implements a feedback system using interferometry to monitor corneal topography changes in real-time during cross-linking treatment. The system measures corneal surface profiles and provides feedback to control the light delivery pattern, allowing dynamic adjustment to maintain desired corneal shape while preventing ectasia. This closed-loop control ensures structural stability is maintained throughout the treatment process.
Solution Approach 2:
The patent applies controlled cross-linking treatment that modifies the biochemical parameters of corneal collagen fibrils by introducing cross-linking agents and activating them with specific light wavelengths. This chemical parameter change strengthens the corneal stroma and enhances structural stability, directly addressing the post-LASIK ectasia problem while preserving vision correction benefits.
2Ease of operation
If thermokeratoplasty is used to reshape the cornea, then noninvasive correction is achieved, but biomechanical strength of corneal tissue deteriorates
Solution Approach 1:
The patent uses controlled cross-linking to change the biochemical parameters of corneal collagen, creating strong cross-links between collagen fibrils. This chemical modification significantly increases the biomechanical strength of corneal tissue, providing a noninvasive solution that strengthens the cornea without requiring physical incisions or tissue removal, thereby addressing both ease of operation and strength requirements.
Solution Approach 2:
The patent creates a composite structure within the cornea by introducing cross-linking agents that form additional bonding networks between collagen fibrils. This composite approach combines the original collagen matrix with new cross-linked structures, resulting in tissue that maintains noninvasive treatment advantages while achieving enhanced biomechanical strength.
3Stability of the object's composition
If cross-linking agent is applied to corneal tissue, then structural stability is improved, but haze formation increases
Solution Approach 1:
The patent applies cross-linking treatment with spatial precision using controlled light delivery patterns that target specific corneal regions. By localizing the cross-linking to areas requiring structural reinforcement and controlling the depth and distribution of treatment, the system achieves structural stability while minimizing diffuse haze formation that would occur with non-selective treatment.
Solution Approach 2:
The interferometric feedback system monitors corneal transparency and topography in real-time, allowing the system to adjust light delivery parameters dynamically. When haze formation is detected, the system can modify treatment parameters to reduce scattering while maintaining structural stabilization, thereby achieving stability without excessive haze.
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 system effectively stabilizes and strengthens corneal tissue, reducing haze formation and maintaining desired structural changes, thereby enhancing the biomechanical integrity and safety of the cornea post-treatment.
Implementation Method 1
a light source adapted to emit a photoactivating light... to initiate molecular cross-linking
Implementation Method 2
The interferometer monitors the amount of cross-linking in the corneal tissue by interfering a beam of light reflected from a surface of the eye with a reference beam of light reflected from a reference surface
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Devices and approaches for activating cross-linking within corneal tissue to stabilize and strengthen the corneal tissue following an eye therapy treatment. A feedback system is provided to acquire measurements and pass feedback information to a controller. The feedback system may include an interferometer system, a corneal polarimetry system, or other configurations for monitoring cross-linking activity within the cornea. The controller is adapted to analyze the feedback information and adjust treatment to the eye based on the information. Aspects of the feedback system may also be used to monitor and diagnose features of the eye. Methods of activating cross-linking according to information provided by a feedback system in order to improve accuracy and safety of a cross-linking therapy are also provided.