Corneal Cross-Linking with Selective Epithelial Disruption
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Solution Overview
Problem
Existing cross-linking treatments for the eye, such as those for keratoconus and post-LASIK ectasia, face challenges in efficiently delivering cross-linking agents and photoactivating light to the cornea, particularly due to the impermeability of the corneal epithelium and the need for precise control over cross-linking depth and distribution.
Innovation Solution
The system employs a laser system or mechanical disruptor to ablate the apical layers of the corneal epithelium, allowing for enhanced permeability and precise delivery of cross-linking agents, combined with controlled photoactivating light to achieve targeted cross-linking, using systems like excimer or femtosecond lasers and optical elements for precise light focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the corneal epithelium is left intact, then the cornea is protected from infection and damage, but the cross-linking agent cannot penetrate the cornea effectively
Solution Approach 1:
The corneal epithelium is disrupted prior to application of the cross-linking agent, creating enhanced permeability pathways. This preliminary disruption allows the cross-linking agent to penetrate effectively while the epithelium remains in place, resolving the contradiction between maintaining protective integrity and enabling drug delivery.
2Reliability
If the cross-linking treatment is applied to the entire cornea, then comprehensive stabilization is achieved, but treatment time and patient discomfort increase
Solution Approach 1:
The disruption and cross-linking treatment are applied selectively to specific regions of the cornea rather than uniformly across the entire surface. This localized approach concentrates the therapeutic effect on areas requiring stabilization while reducing overall treatment time and patient discomfort.
3Quantity of substance
If deeper tissue disruption is performed to enhance agent delivery, then cross-linking agent penetration improves, but tissue damage and infection risk increase
Solution Approach 1:
The disruption is applied to a controlled extent - sufficient to enhance permeability but limited to avoid excessive tissue damage. The disruption depth and intensity are carefully calibrated to achieve the minimum necessary penetration enhancement while maintaining tissue integrity and minimizing infection risk.
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
This approach enhances the efficiency and precision of cross-linking treatments, reducing treatment time, minimizing patient discomfort, and reducing risks of infection and tissue damage, while achieving desired refractive corrections and corneal stabilization.
Implementation Method 1
a laser system configured to direct an ablative laser to a cornea of an eye... control the laser system to ablate tissue at an area at a surface of the cornea
Implementation Method 2
deliver photoactivating light to the cornea... activates the cross-linking agent to generate cross-linking activity in the cornea
Data Source
Figure 1
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Figure 2B
AI summary
Example eye treatments determine an area at a surface of a cornea for delivery of a cross-linking agent. The example treatments disrupt tissue at the area at the surface of the cornea up to a depth corresponding to apical layers of superficial squamous cells of the cornea, e.g., no greater than approximately 10 µm to approximately 15 µm. The example treatments apply a cross-linking agent to the area at the surface of the cornea. The cross-linking agent is transmitted through the disrupted area at a greater rate relative to non-disrupted areas of the cornea. The example treatments deliver photoactivating light to the cornea. The photoactivating light activates the cross-linking agent to generate cross-linking activity in the cornea.