Intraocular Lens Haptic Geometry for Uniform Capsular Force
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Solution Overview
Problem
Existing intraocular lenses (IOLs) cause striae in the posterior capsular bag due to uneven force distribution, which can lead to increased posterior capsular opacification (PCO) and complicate implantation, while maintaining rotational and axial stability is crucial.
Innovation Solution
An intraocular lens design with haptics featuring a gusset region that monotonically increases in thickness and a distal region that monotonically decreases in thickness, providing a greater angle of contact (>50 degrees) to enhance uniform force distribution and stability, while minimizing incision size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing IOL haptic designs are used, then the IOL can be implanted and provide vision correction, but the haptics cause uneven force distribution that creates striae in the posterior capsular bag
Solution Approach 1:
The patent applies local quality by varying the haptic thickness along its length, with the gusset region having monotonically increasing thickness and the distal region having monotonically decreasing thickness. This non-uniform thickness distribution creates a greater angle of contact with the capsular bag, resulting in more uniform force distribution across the capsular bag surface and reducing striae formation while maintaining the vision correction function.
Solution Approach 2:
The patent changes the geometric parameters of the haptic, specifically the thickness profile and angle of contact. By designing the haptic with monotonically increasing thickness in the gusset region and monotonically decreasing thickness in the distal region, the angle of contact with the capsular bag is increased to greater than 50 degrees, which transforms the force distribution pattern from concentrated to uniform, thereby reducing striae.
2Object-affected harmful factors
If haptics with greater angle of contact are used to reduce striae, then force distribution improves, but the IOL volume increases which may require larger incisions
Solution Approach 1:
The patent resolves this contradiction by applying local quality through non-uniform thickness distribution in the haptic. The gusset region has monotonically increasing thickness to achieve greater angle of contact and uniform force distribution, while the distal region has monotonically decreasing thickness to reduce overall volume. This localized variation in thickness allows the IOL to achieve striae reduction without requiring a uniform increase in overall volume that would necessitate larger incisions.
Data Source
AI summary
An ophthalmic lens includes an optic comprising an anterior surface, a posterior surface, and an optic edge extending between the anterior surface and the posterior surface, the optic having an optical axis. The ophthalmic lens further includes a plurality of haptics extending from a periphery of the optic, each of the plurality of haptics including a gusset region, a distal region, and an elbow region connecting the gusset region to the distal region. The gusset region of each of the plurality of haptics extends from the periphery of the optic and spans a portion of the periphery of the optic. In addition, the gusset region of each of the plurality of haptics monotonically increases in thickness with increased distance from the periphery of the optic, while the distal region of each of the plurality of haptics monotonically decreases in thickness with increased distance from the elbow region.