Intraocular Lens Haptic Recesses for Capsular Stability
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Solution Overview
Problem
Intraocular lenses with plate-like haptic bodies can experience mechanical tension and deformation in small capsular bags, leading to axial displacement of the optic body, astigmatic distortion, and increased risk of post-cataract formation due to inadequate contact with the capsular bag's rear wall.
Innovation Solution
The design incorporates a plate-like haptic body with strategically positioned recesses that allow for elastic deformation and torsional rigidity, maintaining the optic body's position and preventing astigmatic distortion, featuring a geometric center with point-symmetrically arranged haptic bodies and a ratio of outer radius to radial distance optimized for stability within the capsular bag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plate-like haptic body is used to improve handling and stability, then the intraocular lens can be easily centered and maintains stable position, but the lens experiences great mechanical tension and bends along its longitudinal axis in small capsular bags
Solution Approach 1:
The haptic body is segmented by introducing first and second recesses that divide the plate structure into multiple zones. These recesses allow the haptic body to flex and deform locally without causing overall bending of the entire lens, thus maintaining shape stability while preserving handling ease.
Solution Approach 2:
The recesses are strategically positioned at specific locations on the haptic body to create localized flexibility zones. The first recesses are positioned to allow bending in one direction while the second recesses are positioned to allow bending in another direction, enabling the haptic body to adapt to small capsular bags without compromising the overall structural integrity of the lens.
2Area of stationary object
If a plate-like haptic body is used to achieve large contact area with capsular bag wall, then the position of intraocular lens remains stable, but the lens deforms and causes axial displacement of the optic body in small capsular bags
Solution Approach 1:
The plate-like haptic body is divided into multiple segments by the recesses, allowing each segment to maintain contact with the capsular bag wall independently. This segmentation enables the haptic body to conform to the curved surface of small capsular bags without causing axial displacement of the optic body, thus preserving optical performance reliability while maintaining large contact area.
Solution Approach 2:
The recesses introduce dynamic flexibility to the haptic body, allowing it to adapt its shape based on the size of the capsular bag. In small capsular bags, the haptic body can flex within the recesses to maintain contact without transmitting excessive force to the optic body, preventing axial displacement and maintaining reliable optical performance.
3Length of moving object
If the haptic body is made slim to enable strong folding for small incision insertion, then the lens can be inserted through very small incision, but the haptic body lacks sufficient rigidity to prevent deformation and maintain lens position
Solution Approach 1:
The recesses are positioned to create localized flexibility zones without compromising the overall rigidity of the haptic body. The regions between the recesses maintain sufficient thickness and rigidity to prevent deformation, while the recess areas provide controlled flexibility for folding and insertion through small incisions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures the intraocular lens remains centered and stable, preventing axial displacement and astigmatic distortion, while maintaining effective contact with the capsular bag's inner wall, thus preserving sharp vision and preventing post-cataract formation even in smaller capsular bags.
Implementation Method 1
at least two first recesses are present in the first haptic body... allowing for elastic deformation and torsional rigidity
Data Source
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AI summary
The invention relates to an intraocular lens (1), having: - an optical body (2) having a geometric centre point (M), through which a first main axis extends as a longitudinal axis (L) and a second main axis extends as a transverse axis (Q), wherein the transverse axis (Q) is arranged perpendicular to the longitudinal axis (L) of the intraocular lens (1), - a flat first haptic body (31) adjacent to the optical body (2) and a flat second haptic body (32) adjacent to the optical body (2), wherein the first haptic body (31) and the second haptic body (32) are arranged point-symmetrically to the geometric centre point (M), wherein an outer radius (RA) of the intraocular lens (1) about the geometric centre point M and a radial distance (A1) from the geometric centre point (M) to an intersection point (S1) of the transverse axis (Q) with a circumferential line (12) of the intraocular lens (1) have a ratio to one another in the range from 1:0.5 to 1:0.9, wherein at least two first recesses (4) are provided in the first haptic body (31) , the one first recess (4) being on the left of the longitudinal axis (L) and the other first recess (4) being on the right of the longitudinal axis (L), wherein the two first recesses (4) each have a first recess length (L4) and a first recess width (B4), the first recess length (L4) being greater than the first recess width (B4).