Streamlined Haptic Cross-Section for IOL Capsular Bag Stability
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Solution Overview
Problem
Intraocular lenses (IOLs) often cause damage to the capsular bag during explantation or repositioning due to adherence, and can lead to posterior capsular opacification (PCO) due to striae formation.
Innovation Solution
The design of IOLs with a haptic structure featuring a streamlined cross-sectional geometry, where the outer peripheral surface is smoothly curved and contacts the capsular bag, reducing adherence and enhancing stability, while sharp edges on the inner surface reduce cell migration and PCO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the haptic structure is designed to retain the IOL firmly within the capsular bag, then the IOL stability is improved, but the haptics may adhere to the capsular bag making explantation and repositioning difficult and potentially damaging
Solution Approach 1:
The haptic structure employs different surface geometries at different locations: the outer peripheral surface has a streamlined, smoothly curved geometry that reduces adherence to the capsular bag, while the inner peripheral surface has a non-streamlined geometry that provides sufficient retention. This local differentiation allows the same haptic to simultaneously achieve easy explantation externally while maintaining firm internal retention.
2Stability of the object's composition
If the haptic structure contacts the capsular bag to provide retention, then the IOL is securely held in place, but striae or folds may form in the posterior capsular bag leading to PCO
Solution Approach 1:
The outer peripheral surface of the haptic is designed with a streamlined, smoothly curved cross-sectional geometry that closely conforms to the curved surface of the capsular bag. This curved design distributes contact pressure evenly across the capsular bag surface, preventing the formation of striae or folds that would otherwise lead to PCO, while still maintaining effective IOL retention.
3Ease of manufacture
If the haptic cross-section has a non-streamlined geometry, then the manufacturing is simpler, but the haptics adhere to the capsular bag causing damage during movement
Solution Approach 1:
The haptic cross-sectional geometry is modified by changing the streamline parameter of the outer peripheral surface. This geometric parameter change creates a surface that reduces adherence through fluid dynamic principles, allowing the haptic to be moved during explantation without damaging the capsular bag, while the inner peripheral surface maintains its traditional geometry for manufacturing simplicity.
Data Source
AI summary
An ophthalmic device includes an optic and a haptic structure coupled with the optic. The optic includes an optic axis. The haptic structure is coupled to the optic. The haptic structure retains the ophthalmic device within a capsular bag of a patient's eye. At least a portion of the haptic structure has a cross-section and a peripheral surface forming an outer periphery of a portion of the cross-section. At least a portion of the peripheral surface contacts the capsular bag and is smoothly curved.