Phakic Intraocular Lens with Flexible Haptics for Ciliary Sulcus Adaptation
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Solution Overview
Problem
Posterior chamber phakic intraocular lenses face challenges in stability due to anatomical variations in the ciliary sulcus, leading to potential complications such as contact with the natural lens, cataract formation, inflammation, and pupillary block, as existing sizes may not adequately fit individual eye anatomies.
Innovation Solution
A posterior chamber phakic intraocular lens design featuring a central optical part and a peripheral haptic with support elements forming a rigid dome, combined with flexible haptics that extend radially and circumferentially, allowing for stabilization and adaptability to various eye anatomies by creating a defined vault and accommodating size variations of the ciliary sulcus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-size posterior chamber phakic intraocular lens is used, then the manufacturing and inventory process is simplified, but the lens cannot adapt to varying ciliary sulcus sizes across different patients, leading to instability and potential complications
Solution Approach 1:
The haptic part of the lens is segmented into multiple flexible struts that can independently deflect and adapt to the ciliary sulcus geometry. This segmentation allows the single lens design to accommodate varying sulcus sizes while maintaining stability, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The haptic structure incorporates dynamic flexibility through its material properties and geometric design, allowing the lens to actively adapt its shape and position within the ciliary sulcus. This dynamic capability enables a fixed-size lens to function adaptively across different patient anatomies without requiring multiple lens sizes.
2Measurement precision
If the phakic intraocular lens is positioned with high precision, then vision correction quality is improved, but the stability of the lens position over time deteriorates due to anatomical variations
Solution Approach 1:
The flexible haptic structure enables the lens to self-position and self-stabilize within the ciliary sulcus through its inherent elastic properties. The lens automatically adjusts to achieve optimal positioning without requiring complex fixation mechanisms, thereby maintaining both high positioning precision and long-term stability across varying anatomies.
Solution Approach 2:
The lens design utilizes parameter changes in the haptic structure's flexibility and geometry to achieve stable positioning. By optimizing the elastic modulus, strut thickness, and curvature parameters, the lens can maintain precise position stability despite anatomical variations in the ciliary sulcus.
3Object-affected harmful factors
If the lens size is increased to ensure coverage, then the risk of contact with the natural lens is reduced, but the risk of inflammation, depigmentation, and pupillary block increases
Solution Approach 1:
The haptic part employs flexible thin-film structures that can conform precisely to the ciliary sulcus boundaries. This flexible design allows the lens to achieve adequate coverage and maintain safe distance from the natural lens without excessive size, thereby preventing both contact-related harm and size-related complications such as inflammation and pupillary block.
4Adaptability or versatility
If multiple lens sizes are produced to fit different eye anatomies, then the adaptability to patient variations is improved, but the manufacturing complexity and inventory requirements increase
Solution Approach 1:
The lens design achieves universality through its flexible haptic structure that can adapt to a wide range of ciliary sulcus sizes and geometries. This single universal lens design eliminates the need for multiple specialized lens sizes, simplifying manufacturing processes and inventory management while maintaining high adaptability to diverse patient anatomies.
Data Source
AI summary
A posterior chamber phakic intraocular lens comprising a central optical part, a peripheral haptic part comprising a plurality of support elements arranged to lie on a ciliary zonule of an eye, and at least one flexible haptic comprising a reticulated distal region arranged to lay into a ciliary sulcus of the eye.