Accommodating Intraocular Lens With Capsule Bag Motion Amplification
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Solution Overview
Problem
Existing accommodating intraocular lenses exhibit only slight focus adjustment functions due to limited movement of the optical portion in response to the lens capsule's movements, and they are prone to adhesion and hardening of the lens capsule post-surgery, which affects practical focus adjustment abilities.
Innovation Solution
An accommodating intraocular lens with a lens capsule expansion bag composed of an annular anterior, posterior, and intermediate bag portions, and support portions with elastic forces, allowing for large movements of the optical portion by capturing minute lens capsule movements and preventing adhesion and hardening through continuous contact with the lens capsule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support portion is simply expanded or narrowed in the radial direction in response to lens capsule movement, then the device structure is simple, but the optical portion movement is insufficient for practical focus adjustment
Solution Approach 1:
The support portion is divided into multiple segments (first support portion, second support portion, third support portion) that can move independently. This segmentation allows each segment to contribute to amplifying the optical portion movement, achieving practical focus adjustment while maintaining reasonable structural complexity
Solution Approach 2:
The support portions are configured to move not only radially but also in the anterior-posterior direction. This multi-dimensional movement capability transforms the simple radial expansion/contraction into complex motion patterns that amplify optical portion displacement, resolving the contradiction between structural simplicity and adjustment effectiveness
2Ease of manufacture
If the lens capsule is incised and the intraocular lens is inserted, then cataract surgery can be performed, but the lens capsule is prone to adhesion and hardening post-surgery
Solution Approach 1:
The intermediate bag portion is pre-configured to protrude radially outward and make contact with the lens capsule equator before surgery completion. This preliminary positioning ensures continuous contact is maintained, preventing adhesion and hardening that would otherwise occur after the incised capsule heals
Solution Approach 2:
The intermediate bag portion acts as an intermediary element between the intraocular lens and the lens capsule. By maintaining continuous contact through its protruding structure, it serves as a mechanical barrier that prevents direct adhesion between the incised capsule edges, thereby maintaining capsule reliability post-surgery
3Ease of operation
If the optical portion moves only slightly in response to lens capsule movement, then the device structure is simple, but the focus adjustment ability is insufficient for practical use
Solution Approach 1:
The support portions are designed with dynamic movement characteristics, allowing them to change their positional relationships during operation. The first, second, and third support portions can move relative to each other in response to lens capsule dynamics, creating an amplification effect that enhances optical portion movement without requiring a complex fixed structure
Solution Approach 2:
Multiple support portions are merged into a coordinated system where the first support portion connects to the optical portion, the second support portion connects to the first, and the third support portion connects to the second. This merging creates a cumulative movement amplification effect, achieving practical focus adjustment ability while keeping individual component complexity manageable
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 lens capsule expansion bag amplifies minute lens capsule movements to large optical portion movements, ensuring effective focus adjustment and preventing lens capsule adhesion and hardening, thereby enhancing practical focus adjustment capabilities.
Implementation Method 1
The lens capsule expansion bag has an elastic force. The support portion has an elastic force.
Implementation Method 2
the intermediate bag portion is configured to press the lens capsule equator
Data Source
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AI summary
The present invention aims to provide an accommodating intraocular lens capable of exerting a practical focus adjustment function. The accommodating intraocular lens includes a lens capsule expansion bag 1 to be placed in a lens capsule S whose anterior capsule has been incised in ophthalmic surgery, and an intraocular lens 2 to be placed in the lens capsule expansion bag 1. The lens capsule expansion bag 1 includes an anterior bag portion 11 to be in contact with an anterior capsule Sf, a posterior bag portion 12 to be in contact with a posterior capsule Sb, and an intermediate bag portion 13 to be in contact with an equator Se. The intraocular lens 2 includes an optical portion 21 and a support portion 22. The support portion 22 includes an anterior support portion 23 to be in contact with the anterior bag portion 11 and a posterior support portion 24 to be in contact with the posterior bag portion 12. In response to the movement of the lens capsule S, the lens capsule expansion bag 1 deforms, and the anterior support portion 23 of the intraocular lens 2 greatly deflects or returns accordingly, whereby the optical portion 21 is largely moved in the anterior-posterior direction.