Intraocular Lens Haptic Bending Points for Stable Centering
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Solution Overview
Problem
Conventional intraocular lenses face issues with precise positioning and stability during insertion, leading to potential tilting and suboptimal optical alignment, which affects visual quality, and are often not customized for individual eye sizes.
Innovation Solution
The intraocular lens features a haptic device with predetermined bending points and elastic retaining elements that center and fix the lens within the capsular bag, ensuring stable positioning by slightly stretching the bag and adapting to its geometry, using a single-piece design with C-haptics for easy insertion and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distal end of the haptic is tapered to a point, then the haptic can be inserted into the capsular bag more easily, but the haptic may bend or deform during insertion and implantation
Solution Approach 1:
The haptic features a localized target bending point with modified geometry (tapered section or enlarged cross-section) at a specific position along its length. This local structural variation allows the haptic to bend predictably at the target location during insertion while maintaining shape stability in other regions, resolving the contradiction between insertion ease and overall shape stability.
2Ease of operation
If the haptic is made more flexible to facilitate insertion, then insertion ease improves, but the haptic may过度 bend or deform during implantation
Solution Approach 1:
The haptic incorporates a target bending point with specific geometric features (tapered section or enlarged cross-section) that localize flexibility to a controlled region. This allows the haptic to be sufficiently flexible for insertion while maintaining strength and resistance to excessive bending in other regions, resolving the contradiction between insertion ease and bending resistance.
3Strength
If the haptic cross-section is enlarged to reduce bending, then haptic strength improves, but the haptic becomes harder to insert into the capsular bag
Solution Approach 1:
The haptic features a target bending point with enlarged cross-section or tapered geometry at a specific location, creating a localized region of increased strength and bending resistance. The remainder of the haptic maintains a smaller cross-section that facilitates easy insertion, resolving the contradiction between overall haptic strength and insertion ease.
Data Source
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AI summary
The invention relates to an intraocular lens (1, 11) as an implant for replacing a natural lens in the capsular bag of an eye, said intraocular lens comprising: a lens body (2, 12) for forming the central optical lens which has an optical axis (OA); and a haptic device (3, 13) attached to the edge of the lens body (2, 12); wherein the haptic device (3, 13) lies in a bearing plane (E) which is perpendicular to the optical axis (OA) of the lens body (2, 12), and the haptic device (3, 13) comprises at least one retaining element (4, 14), at least sections of which are arcuate. For secure positioning and centring, the at least one retaining element (4, 14) has at least one target bending point (5, 15, 16), the width of which in the bearing plane (E) is less than the thickness in the direction of the optical axis (OA).