Intraocular Lens Haptic Cap for Accommodation
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Solution Overview
Problem
Existing intraocular lenses with single focal lengths cannot accommodate, leading to blurred vision at varying distances, whereas accommodating intraocular lenses need an efficient haptic design to convert zonular force into power and axial location changes, reducing eye fatigue.
Innovation Solution
A haptic design that couples the optic to the capsular bag, allowing distortion in response to radial forces, with a cap structure that aids in power changes and reduces pressure on eye structures, enabling efficient accommodation and reduced fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single focal length IOL is used, then the lens structure is simple, but the patient cannot accommodate and vision is blurred at varying distances
Solution Approach 1:
The patent implements a dynamic accommodating IOL that can change its focal length in response to zonular force, transitioning between multiple focal positions (e.g., distance and near focus) to provide accommodation similar to the natural lens, thereby resolving the contradiction between structural simplicity and adaptability
2Adaptability or versatility
If an accommodating IOL is used to enable power adjustment, then vision at multiple distances is improved, but the haptic design becomes more complex to efficiently convert zonular force into power and axial location changes
Solution Approach 1:
The haptic is divided into multiple segments or zones with different mechanical properties, allowing selective deformation under zonular force. This segmentation enables efficient conversion of force into controlled power and axial location changes while maintaining manageable design complexity
Solution Approach 2:
Different portions of the haptic are designed with varying stiffness, flexibility, or geometric characteristics to optimize local response to zonular force, enabling precise control over power adjustment and axial movement without requiring the entire haptic structure to be overly complex
3Productivity
If the haptic efficiently converts zonular force into power changes, then accommodation range is improved, but pressure on eye structures may increase causing fatigue
Solution Approach 1:
The haptic design optimizes mechanical parameters such as stiffness, leverage ratio, and force distribution to achieve efficient force conversion while maintaining pressure within safe limits, preventing eye fatigue during accommodation
Solution Approach 2:
The haptic acts as an intermediary mechanism that distributes and modulates the force from zonular fibers, transforming it into controlled lens movement and shape change while preventing excessive localized pressure that could cause fatigue
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
The haptic design enhances the intraocular lens's ability to change power and axial location efficiently, improving vision by mimicking natural eye accommodation and reducing the force required from zonular fibers, thus minimizing eye fatigue.
Implementation Method 1
A desirable optic for an accommodating IOL is one that distorts in response to a squeezing or expanding radial force applied largely to the equator of the optic
Implementation Method 2
with a cap structure that aids in power changes and reduces pressure on eye structures
Data Source
AI summary
A deformable intraocular has a haptic that supports the optic around its equator and couples the optic to the capsular bag of the eye. The haptic may include a cap on one or both surfaces of the lens. The lens may include a force transfer member-that couples forces from the haptic to the cap, so that a radial force on the haptic changes the curvature of the cap. The cap may be made of the haptic material, which is stiffer than the optic material, and can influence the deformation of the lens during accommodation. A cap on the anterior surface may produce an axial movement of the lens in an anterior direction during accommodation. The cap may also protect the surfaces of the optic during handling and installation.