Accommodating Intraocular Lens with Dynamic Curvature
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Solution Overview
Problem
Current ophthalmic intraocular lenses fail to effectively restore the accommodating capacity of the young crystalline lens, leading to inadequate correction of presbyopia, as they often rely on incorrect mechanisms, capsular integrity, and are limited by fibrosis and mechanical instability.
Innovation Solution
An intraocular lens design featuring a dynamic optical power system with a deformable first optical member and a fixed second optical member, anchored directly to the capsular bag via a mechanical or biocompatible adhesive system, allowing for variable curvature in response to ciliary muscle traction forces to achieve accommodation and disaccommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional intraocular lenses are implanted to replace the crystalline lens, then cataract is treated and vision is restored, but the accommodating capacity is lost and presbyopia cannot be corrected
Solution Approach 1:
The patent applies the dynamics principle by designing an intraocular lens with a deformable optical member that can dynamically change its curvature in response to ciliary muscle contraction. The lens transitions from a static fixed-focus design to a dynamic system where the optical power varies continuously, enabling accommodation at multiple distances while maintaining reliable vision correction.
Solution Approach 2:
The patent implements parameter changes by modifying the curvature parameter of the optical member's surface. When the ciliary muscle contracts, the curvature of the optical member changes, which directly alters the optical power of the lens. This parameter change enables the lens to provide different focusing powers for near and far vision, restoring accommodative capacity.
2Adaptability or versatility
If filler materials are injected into the capsular bag to restore accommodation, then dynamic focusing is achieved, but capsular fibrosis occurs causing loss of elasticity and transparency
Solution Approach 1:
The patent applies the taking out principle by removing the filler material from the system and replacing it with a self-contained deformable optical member. Instead of relying on external filler materials that cause fibrosis, the accommodation function is achieved through the inherent elasticity of the optical member itself, which can deform in response to ciliary muscle forces without requiring capsular bag integrity.
Solution Approach 2:
The patent uses an elastic deformable optical member as an intermediary between the ciliary muscle and the optical system. This intermediary component transmits the mechanical forces from the ciliary muscle into optical power changes, eliminating the need for direct filler material injection into the capsular bag and avoiding the associated fibrosis problems.
3Adaptability or versatility
If accommodating intraocular lenses with complex mechanisms are designed, then dynamic optical power is achieved, but the designs fail due to incorrect understanding of accommodation mechanism and mechanical limitations
Solution Approach 1:
The patent achieves dynamic optical power through simple parameter changes in the curvature of the optical member, avoiding complex mechanical mechanisms. The deformation of the elastic optical member directly changes the optical parameters, providing a reliable and mechanically simple solution that correctly follows the natural accommodation mechanism.
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 enables continuous range of optical powers for focusing from far to near distances, emulating natural accommodation, while being immune to capsular fibrosis and opacification, thus providing effective presbyopia correction without the need for external optical aids.
Implementation Method 1
at least one of which has a curvature capable of becoming deformed elastically in response to traction forces of the ciliary muscle
Implementation Method 2
an anchoring system to anchor the first optical member to at least a portion of the capsular bag of the crystalline lens of the eye, to directly transmit traction forces generated by the ciliary muscle
Data Source
AI summary
Intraocular lens with accommodation capacity comprising a first optical member (1) having a dynamic optical power, to which a second optical member (2) with a fixed optical power is affixed, in such a manner that at least a central part of each of one of one of the curved surfaces (2a, 2b) of the second optical member (2) and of at least one of the surfaces (1a, 1b) of the first optical member (1) are in contact with each other, the second optical member (2) and the first optical member (1) providing a joint optical power which is variable between a condition of minimum optical power corresponding to a condition of disaccommodation and a condition maximum optical power corresponding to a condition of accommodation, and the first optical member and an anchoring system (3) being designed to change the curvature of at least one of the surfaces (1a, 1b) of the first optical element (1) progressively between a maximum curvature corresponding to the condition of accommodation in response to a minimum effective traction force of the ciliary muscle received through the anchoring system (3), and a maximum effective traction force of the ciliary muscle received by the anchoring system (3).