Intraocular Lens with Flap Supports for Capsular Bag Fixation
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Solution Overview
Problem
Existing intraocular lens (IOL) placement techniques often result in difficulty and a high chance of capsular bag damage during or after IOL implantation, with suboptimal rotation stability due to the geometry of prior art circumferential grooves.
Innovation Solution
An IOL design featuring anterior and posterior supports that securely engage the capsular bag flaps, with a perimeter matching the opening shape to ensure proper alignment and fixation, and an axially extending groove for fluid communication, allowing for straightforward and secure placement without excessive capsular bag damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional haptic-based IOL fixation is used, then the IOL can be positioned in the capsular bag, but the capsular bag is prone to damage and the fixation is not sufficiently stable
Solution Approach 1:
The IOL is divided into distinct functional segments: an optical portion and multiple support portions (first and second supports) that extend in different directions. This segmentation allows the supports to engage with the capsular bag flap at different locations, distributing mechanical stress and improving fixation stability without concentrating force that could damage the capsular bag.
Solution Approach 2:
The support portions are designed to be received within the capsular bag flap structure, with the first support engaged in a first region and the second support engaged in a second region of the flap. This nesting arrangement allows the IOL to be securely fixed within the natural capsular structure without requiring excessive force or complex fixation mechanisms that could cause damage.
2Stability of the object's composition
If circumferential grooves are used for IOL alignment, then the IOL can be positioned in the capsular bag, but rotation stability is suboptimal
Solution Approach 1:
The support portions are designed with asymmetric characteristics relative to the optical portion, with the first support extending in a first direction and the second support extending in a second direction. This asymmetric arrangement provides inherent rotation stability by creating unequal moment arms that resist rotational forces, eliminating the need for complex circumferential groove geometries.
3Reliability
If complex IOL placement procedures are used, then the IOL can be securely fixed, but the procedure becomes difficult and time-consuming
Solution Approach 1:
The support portions are pre-configured in specific directions relative to the optical portion before implantation. This preliminary arrangement of the supports allows them to naturally engage with predetermined regions of the capsular bag flap during insertion, enabling secure fixation to be achieved through the straightforward insertion motion itself, without requiring complex post-insertion adjustment procedures.
Data Source
AI summary
An intra ocular lens (IOL) for placement in the capsular bag and securing the IOL in an opening in an anterior part of a capsular bag, with an anterior capsular bag flap surrounding said opening. An anterior side, which in use when the IOL is implanted in an eye is directed towards a cornea of the eye. A posterior side, which in use when the IOL is implanted in an eye is directed towards a retina of the eye. The IOL comprises an optical structure, at least two posterior supports to provide support for a posterior surface of an anterior capsular bag flap, and at least two anterior supports to provide support for an anterior surface of an anterior capsular bag flap, when IOL residing inside and outside of the anterior capsular bag flap respectively.